Commit graph

566 commits

Author SHA1 Message Date
David S. Miller
87bdc367ca [SPARC64]: Trim down sun4v IRQ translation kernel log message.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:47 -08:00
David S. Miller
d5a2aa241a [SPARC64] sunhv: Bug fixes.
Add udelay to polling console write loop, and increment
the loop limit.

Name the device "ttyHV" and pass that to add_preferred_console()
when we're using hypervisor console.

Kill sunhv_console_setup(), it's empty.

Handle the case where we don't want to use hypervisor console.
(ie. we have a head attached to a sun4v machine)

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:46 -08:00
David S. Miller
e77227eb4e [SPARC64]: Probe virtual-devices root node on sun4v.
This is where we learn how to get the interrupts
for things like the hypervisor console device.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:44 -08:00
David S. Miller
d5eb400430 [SPARC64]: Kill spurious semicolon in sun4v_pci_init().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:43 -08:00
David S. Miller
10951ee610 [SPARC64]: Program IRQ registers correctly on sun4v.
Need to use hypervisor calls instead of direct register
accesses.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:41 -08:00
David S. Miller
e3999574b4 [SPARC64]: Generic sun4v_build_irq().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:40 -08:00
David S. Miller
10804828fd [SPARC64]: More SUN4V PCI work.
Get bus range from child of PCI controller root nexus.
This is actually a hack, but the PCI-E bridge sitting
at the top of the PCI tree responds to PCI config cycles
for every device number, so best to just ignore it for now.

Preliminary PCI irq routing, needs lots of work.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:39 -08:00
David S. Miller
bf941d6cd6 [SPARC64]: Log faulting vaddr when bogus kernel PC detected.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:38 -08:00
David S. Miller
6c0f402f6c [SPARC64]: Implement rest of generic interrupt hypervisor calls.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:37 -08:00
David S. Miller
85dfa19ba9 [SPARC64]: Move devino_to_sysino out of pci_sun4v_asm.S
It is not PCI specific, it is for all system interrupts.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:36 -08:00
David S. Miller
059833eb81 [SPARC64]: Range check bus number in SUN4V PCI controller driver.
It has to be somewhere in the range from pbm->pci_first_busno to
pbm->pci_last_busno, inclusive.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:36 -08:00
David S. Miller
0b522497a1 [SPARC64]: Missing 'return' statement in sun4v_pci_init().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:35 -08:00
David S. Miller
c260926750 [SPARC64]: Implement basic pci_sun4v_scan_bus().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:34 -08:00
David S. Miller
3833789bb2 [SPARC64]: PCI-SUN4V fixes.
Clear top 8-bits of physical addresses in "ranges" property.
This gives the actual physical address.

Detect PBM-A vs. PBM-B by checking bit 0x40 of the devhandle.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:33 -08:00
David S. Miller
cf627156c4 [SPARC64]: Use inline patching for critical PTE operations.
This handles the SUN4U vs SUN4V PTE layout differences
with near zero performance cost.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:32 -08:00
David S. Miller
ff02e0d26f [SPARC64]: Move PTE field definitions back into asm/pgtable.h
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:31 -08:00
David S. Miller
221b2fb818 [SPARC64]: Don't expect cfg space in PCI PBM ranges on SUN4V.
PCI cfg space is accessed transparently through the Hypervisor and not
through direct cpu PIO operations.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:30 -08:00
David S. Miller
6241e5cc6a [SPARC64]: Fix branch signedness bug in all code patching.
The bug that hit SUN4V TLB patching exists elsewhere.
Make sure we cure all such cases.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:29 -08:00
David S. Miller
1a7a242c89 [SPARC64]: Recognize "virtual-console" as input and output console device.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:28 -08:00
David S. Miller
02fead7505 [SPARC64]: Do not try to synchronize %stick registers on SUN4V.
Writes by privileged code are not allowed.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:27 -08:00
David S. Miller
7aa6264543 [SPARC64]: Do not try to write to %tick or %stick on SUN4V.
Writes by privileged code are disallowed.  The hypervisor manages
the non-privileged bit.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:27 -08:00
David S. Miller
b5a37e96b8 [SPARC64]: Fix mondo queue allocations.
We have to use bootmem during init_IRQ and page alloc
for sibling cpu calls.

Also, fix incorrect hypervisor call return value
checks in the hypervisor SMP cpu mondo send code.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:26 -08:00
David S. Miller
c4bce90ea2 [SPARC64]: Deal with PTE layout differences in SUN4V.
Yes, you heard it right, they changed the PTE layout for
SUN4V.  Ho hum...

This is the simple and inefficient way to support this.
It'll get optimized, don't worry.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:25 -08:00
David S. Miller
490384e752 [SPARC64]: Register kernel TSB with hypervisor.
We do this right after we take over the trap table from OBP.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:23 -08:00
David S. Miller
459b6e621e [SPARC64]: Fix some SUN4V TLB miss bugs.
Code patching did not sign extend negative branch
offsets correctly.

Kernel TLB miss path needs patching and %g4 register
preservation in order to handle SUN4V correctly.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:23 -08:00
David S. Miller
fd05068d7b [SPARC64]: Fix typo in sun4v_patch().
Second instruction offset is '4' not '3'.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:22 -08:00
David S. Miller
6cebb52094 [SPARC64]: Fix sun4v early bootup.
prom_sun4v_name should be "sun4v" not "SUNW,sun4v"

Also, this is too early to make use of the
.sun4v_Xinsn_patch code patching, so just check
things manually.

This gets us at least to prom_init() on Niagara.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:21 -08:00
David S. Miller
0d4bc95b9c [SPARC64]: Fix some Niagara memcpy() bugs.
We need to restore the %asi register properly.
For the kernel this means get_fs(), for user this
means ASI_PNF.

Also, NGcopy_to_user.S was including U3memcpy.S instead
of NGmemcpy.S, oops :-)

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:20 -08:00
David S. Miller
e92b92571c [SPARC64]: Handle hypervisor case correctly in copy_tsb().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:19 -08:00
David S. Miller
4bdff41464 [SPARC64]: Fetch bootup time of day from Hypervisor.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:17 -08:00
David S. Miller
36a68e77c5 [SPARC64]: Simplify sun4v TLB handling using macros.
There was also a bug in sun4v_itlb_miss, it loaded the
MMU Fault Status base into %g3 instead of %g2.

This pointed out a fast path for TSB miss processing,
since we have %g2 with the MMU Fault Status base, we
can use that to quickly load up the PGD phys address.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:16 -08:00
David S. Miller
12eaa328f9 [SPARC64]: Use ASI_SCRATCHPAD address 0x0 properly.
This is where the virtual address of the fault status
area belongs.

To set it up we don't make a hypervisor call, instead
we call OBP's SUNW,set-trap-table with the real address
of the fault status area as the second argument.  And
right before that call we write the virtual address into
ASI_SCRATCHPAD vaddr 0x0.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:15 -08:00
David S. Miller
1839794464 [SPARC64]: First cut at SUN4V PCI IOMMU handling.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:15 -08:00
David S. Miller
164c220fa3 [SPARC64]: Fix hypervisor call arg passing.
Function goes in %o5, args go in %o0 --> %o5.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:14 -08:00
David S. Miller
7eae642f75 [SPARC64]: Implement SUN4V PCI config space access.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:12 -08:00
David S. Miller
bade562216 [SPARC64]: More SUN4V PCI controller work.
Add assembler file for PCI hypervisor calls.
Setup basic skeleton of SUN4V PCI controller driver.

Add 32-bit devhandle to PBM struct, as this is needed for
hypervisor calls.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:11 -08:00
David S. Miller
8f6a93a196 [SPARC64]: Beginnings of SUN4V PCI controller support.
Abstract out IOMMU operations so that we can have a different
set of calls on sun4v, which needs to do things through
hypervisor calls.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:10 -08:00
David S. Miller
4cce4b7cc5 [SPARC64]: Fetch cpu mid properly on sun4v.
If there is a "cpuid" property, use that.  Else suck
it out of the top bits of the "reg" property.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:09 -08:00
David S. Miller
ed6b0b4543 [SPARC64]: SUN4V memory exception trap handlers.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:07 -08:00
David S. Miller
618e9ed98a [SPARC64]: Hypervisor TSB context switching.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:06 -08:00
David S. Miller
aa9143b971 [SPARC64]: Implement sun4v TSB miss handlers.
When we register a TSB with the hypervisor, so that it or hardware can
handle TLB misses and do the TSB walk for us, the hypervisor traps
down to these trap when it incurs a TSB miss.

Processing is simple, we load the missing virtual address and context,
and do a full page table walk.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:05 -08:00
David S. Miller
12816ab38a [SPARC64]: kernel/cpu.c needs asm/spitfire.h
For 'tlb_type'.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:05 -08:00
David S. Miller
3a8c069d0e [SPARC64]: Print ARCH as SUN4V when tlb_type is hypervisor.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:04 -08:00
David S. Miller
d82ace7dc4 [SPARC64]: Detect sun4v early in boot process.
We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.

Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.

Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:03 -08:00
David S. Miller
1d2f1f90a1 [SPARC64]: Sun4v cross-call sending support.
Technically the hypervisor call supports sending in a list
of all cpus to get the cross-call, but I only pass in one
cpu at a time for now.

The multi-cpu support is there, just ifdef'd out so it's easy to
enable or delete it later.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:02 -08:00
David S. Miller
5b0c0572fc [SPARC64]: Sun4v interrupt handling.
Sun4v has 4 interrupt queues: cpu, device, resumable errors,
and non-resumable errors.  A set of head/tail offset pointers
help maintain a work queue in physical memory.  The entries
are 64-bytes in size.

Each queue is allocated then registered with the hypervisor
as we bring cpus up.

The two error queues each get a kernel side buffer that we
use to quickly empty the main interrupt queue before we
call up to C code to log the event and possibly take evasive
action.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:01 -08:00
David S. Miller
ac29c11d4c [SPARC64]: Allocate and register the 4 sun4v mondo queues at bootup.
Needs to occur before we enable PSTATE_IE in %pstate.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:12:00 -08:00
David S. Miller
e088ad7ca3 [SPARC64]: Verify all trap_per_cpu assembler offsets in trap_init()
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:59 -08:00
David S. Miller
8b11bd12af [SPARC64]: Patch up mmu context register writes for sun4v.
sun4v uses ASI_MMU instead of ASI_DMMU

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:56 -08:00
David S. Miller
481295f982 [SPARC64]: Register per-cpu fault status area with sun4v hypervisor.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:55 -08:00
David S. Miller
8591e30272 [SPARC64]: Niagara copy/clear page.
Happily we have no D-cache aliasing issues on these
chips, so the implementation is very straightforward.

Add a stub in bootup which will be where the patching
calls will be made for niagara/sun4v/hypervisor.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:54 -08:00
David S. Miller
df7d6aec96 [SPARC64]: Rename gl_{1,2}insn_patch --> sun4v_{1,2}insn_patch
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:53 -08:00
David S. Miller
d257d5da39 [SPARC64]: Initial sun4v TLB miss handling infrastructure.
Things are a little tricky because, unlike sun4u, we have
to:

1) do a hypervisor trap to do the TLB load.
2) do the TSB lookup calculations by hand

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:52 -08:00
David S. Miller
840aaef8db [SPARC64]: Add missing memory barriers to instruction patching functions.
V9 requires a write memory barrier before the instruction flush.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:51 -08:00
David S. Miller
45fec05f80 [SPARC64]: Sanitize %pstate writes for sun4v.
If we're just switching between different alternate global
sets, nop it out on sun4v.  Also, get rid of all of the
alternate global save/restore in the OBP CIF trampoline code.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:50 -08:00
David S. Miller
314981ac71 [SPARC64]: Kill all %pstate changes in context switch code.
They are totally unnecessary because:

1) Interrupts are already disabled when switch_to()
   runs.

2) We don't use hard-coded alternate globals any longer.

This found a case in rtrap, which still assumed alternate
global %g6 was current_thread_info(), and that is fixed
by this changeset as well.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:49 -08:00
David S. Miller
936f482af1 [SPARC64]: Add initial code to twiddle %gl on trap entry/exit.
Instead of setting/clearing PSTATE_AG we have to change
the %gl register value on sun4v.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:48 -08:00
David S. Miller
6e02493a7f [SPARC64]: Fill dead cycles on trap entry with real work.
As we save trap state onto the stack, the store buffer fills up
mid-way through and we stall for several cycles as the store buffer
trickles out to the L2 cache.  Meanwhile we can do some privileged
register reads and other calculations, essentially for free.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:47 -08:00
David S. Miller
d96b81533b [SPARC64]: Add sun4v case to __GET_CPUID() patch tables.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:45 -08:00
David S. Miller
398d108308 [SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:42 -08:00
David S. Miller
a43fe0e789 [SPARC64]: Add some hypervisor tlb_type checks.
And more consistently check cheetah{,_plus} instead
of assuming anything not spitfire is cheetah{,_plus}.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:40 -08:00
David S. Miller
52bf082f0a [SPARC64]: SUN4V hypervisor TLB flush support code.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:38 -08:00
David S. Miller
314ef68597 [SPARC64]: Refine register window trap handling.
When saving and restoing trap state, do the window spill/fill
handling inline so that we never trap deeper than 2 trap levels.
This is important for chips like Niagara.

The window fixup code is massively simplified, and many more
improvements are now possible.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:36 -08:00
David S. Miller
ffe483d552 [SPARC64]: Add explicit register args to trap state loading macros.
This, as well as making the code cleaner, allows a simplification in
the TSB miss handling path.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:35 -08:00
David S. Miller
92704a1c63 [SPARC64]: Refine code sequences to get the cpu id.
On uniprocessor, it's always zero for optimize that.

On SMP, the jmpl to the stub kills the return address stack in the cpu
branch prediction logic, so expand the code sequence inline and use a
code patching section to fix things up.  This also always better and
explicit register selection, which will be taken advantage of in a
future changeset.

The hard_smp_processor_id() function is big, so do not inline it.

Fix up tests for Jalapeno to also test for Serrano chips too.  These
tests want "jbus Ultra-IIIi" cases to match, so that is what we should
test for.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:35 -08:00
David S. Miller
f4e841da30 [SPARC64]: Turn off TSB growing for now.
There are several tricky races involved with growing the TSB.  So just
use base-size TSBs for user contexts and we can revisit enabling this
later.

One part of the SMP problems is that tsb_context_switch() can see
partially updated TSB configuration state if tsb_grow() is running in
parallel.  That's easily solved with a seqlock taken as a writer by
tsb_grow() and taken as a reader to capture all the TSB config state
in tsb_context_switch().

Then there is flush_tsb_user() running in parallel with a tsb_grow().
In theory we could take the seqlock as a reader there too, and just
resample the TSB pointer and reflush but that looks really ugly.

Lastly, I believe there is a case with threads that results in a TSB
entry lock bit being set spuriously which will cause the next access
to that TSB entry to wedge the cpu (since the TSB entry lock bit will
never clear).  It's either copy_tsb() or some bug elsewhere in the TSB
assembly.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:34 -08:00
David S. Miller
7bec08e38a [SPARC64]: Correctable ECC errors cannot occur at trap level > 0.
The are distrupting, which by the sparc v9 definition means they
can only occur when interrupts are enabled in the %pstate register.
This never occurs in any of the trap handling code running at
trap levels > 0.

So just mark it as an unexpected trap.

This allows us to kill off the cee_stuff member of struct thread_info.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:33 -08:00
David S. Miller
517af33237 [SPARC64]: Access TSB with physical addresses when possible.
This way we don't need to lock the TSB into the TLB.
The trick is that every TSB load/store is registered into
a special instruction patch section.  The default uses
virtual addresses, and the patch instructions use physical
address load/stores.

We can't do this on all chips because only cheetah+ and later
have the physical variant of the atomic quad load.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:32 -08:00
David S. Miller
30a6ecad96 [SPARC64]: Don't clobber alt-global %g4 on window fixups.
If we are returning back to kernel mode, %g4 could be live
(for example, in the case where we window spill in the etrap
code).  So do not change it's value if going back to kernel.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:30 -08:00
David S. Miller
86b818687d [SPARC64]: Fix race in LOAD_PER_CPU_BASE()
Since we use %g5 itself as a temporary, it can get clobbered
if we take an interrupt mid-stream and thus cause end up with
the final %g5 value too early as a result of rtrap processing.

Set %g5 at the very end, atomically, to avoid this problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:29 -08:00
David S. Miller
9954863975 [SPARC64]: Kill swapper_pgd_zero, totally unused.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:28 -08:00
David S. Miller
9bc657b28e [SPARC64]: Fix too early reference to %g6
%g6 is not necessarily set to current_thread_info()
at sparc64_realfault_common.  So store the fault
code and address after we invoke etrap and %g6 is
properly set up.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:27 -08:00
David S. Miller
764afe2edb [SPARC64]: Kill hard-coded %pstate setting in sparc_exit.
Just flip the bit off of whatever it's currently set to.
PSTATE_IE is guarenteed to be enabled when we get here.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:26 -08:00
David S. Miller
2f7ee7c63f [SPARC64]: Increase swapper_tsb size to 32K.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:26 -08:00
David S. Miller
a8b900d801 [SPARC64]: Kill sole argument passed to setup_tba().
No longer used, and move extern declaration to a header file.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:25 -08:00
David S. Miller
3487d1d441 [SPARC64]: Kill PROM locked TLB entry preservation code.
It is totally unnecessary complexity.  After we take over
the trap table, we handle all PROM tlb misses fully.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:24 -08:00
David S. Miller
6b6d017235 [SPARC64]: Use sparc64_highest_unlocked_tlb_ent in __tsb_context_switch()
Instead of ugly hard-coded value.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:23 -08:00
David S. Miller
4da808c352 [SPARC64]: Fix bogus flush instruction usage.
Some of the trap code was still assuming that alternate
global %g6 was hard coded with current_thread_info().
Let's just consistently flush at KERNBASE when we need
a pipeline synchronization.  That's locked into the TLB
and will always work.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:22 -08:00
David S. Miller
4753eb2ac7 [SPARC64]: Fix incorrect TSB lock bit handling.
The TSB_LOCK_BIT define is actually a special
value shifted down by 32-bits for the assembler
code macros.

In C code, this isn't what we want.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:21 -08:00
David S. Miller
96c6e0d8e2 [SPARC64]: Kill {save,restore}_alternate_globals()
No longer needed now that we no longer have hard-coded
alternate global register usage.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:20 -08:00
David S. Miller
b70c0fa161 [SPARC64]: Preload TSB entries from update_mmu_cache().
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:19 -08:00
David S. Miller
bd40791e1d [SPARC64]: Dynamically grow TSB in response to RSS growth.
As the RSS grows, grow the TSB in order to reduce the likelyhood
of hash collisions and thus poor hit rates in the TSB.

This definitely needs some serious tuning.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:18 -08:00
David S. Miller
98c5584cfc [SPARC64]: Add infrastructure for dynamic TSB sizing.
This also cleans up tsb_context_switch().  The assembler
routine is now __tsb_context_switch() and the former is
an inline function that picks out the bits from the mm_struct
and passes it into the assembler code as arguments.

setup_tsb_parms() computes the locked TLB entry to map the
TSB.  Later when we support using the physical address quad
load instructions of Cheetah+ and later, we'll simply use
the physical address for the TSB register value and set
the map virtual and PTE both to zero.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:17 -08:00
David S. Miller
09f94287f7 [SPARC64]: TSB refinements.
Move {init_new,destroy}_context() out of line.

Do not put huge pages into the TSB, only base page size translations.
There are some clever things we could do here, but for now let's be
correct instead of fancy.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:16 -08:00
David S. Miller
56fb4df6da [SPARC64]: Elminate all usage of hard-coded trap globals.
UltraSPARC has special sets of global registers which are switched to
for certain trap types.  There is one set for MMU related traps, one
set of Interrupt Vector processing, and another set (called the
Alternate globals) for all other trap types.

For what seems like forever we've hard coded the values in some of
these trap registers.  Some examples include:

1) Interrupt Vector global %g6 holds current processors interrupt
   work struct where received interrupts are managed for IRQ handler
   dispatch.

2) MMU global %g7 holds the base of the page tables of the currently
   active address space.

3) Alternate global %g6 held the current_thread_info() value.

Such hardcoding has resulted in some serious issues in many areas.
There are some code sequences where having another register available
would help clean up the implementation.  Taking traps such as
cross-calls from the OBP firmware requires some trick code sequences
wherein we have to save away and restore all of the special sets of
global registers when we enter/exit OBP.

We were also using the IMMU TSB register on SMP to hold the per-cpu
area base address, which doesn't work any longer now that we actually
use the TSB facility of the cpu.

The implementation is pretty straight forward.  One tricky bit is
getting the current processor ID as that is different on different cpu
variants.  We use a stub with a fancy calling convention which we
patch at boot time.  The calling convention is that the stub is
branched to and the (PC - 4) to return to is in register %g1.  The cpu
number is left in %g6.  This stub can be invoked by using the
__GET_CPUID macro.

We use an array of per-cpu trap state to store the current thread and
physical address of the current address space's page tables.  The
TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this
table, it uses __GET_CPUID and also clobbers %g1.

TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load
the current processor's IRQ software state into %g6.  It also uses
__GET_CPUID and clobbers %g1.

Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the
current address space's page tables into %g7, it clobbers %g1 and uses
__GET_CPUID.

Many refinements are possible, as well as some tuning, with this stuff
in place.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:16 -08:00
David S. Miller
3c93646524 [SPARC64]: Kill pgtable quicklists and use SLAB.
Taking a nod from the powerpc port.

With the per-cpu caching of both the page allocator and SLAB, the
pgtable quicklist scheme becomes relatively silly and primitive.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:14 -08:00
David S. Miller
05e28f9de6 [SPARC64]: No need to D-cache color page tables any longer.
Unlike the virtual page tables, the new TSB scheme does not
require this ugly hack.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:13 -08:00
David S. Miller
74bf4312ff [SPARC64]: Move away from virtual page tables, part 1.
We now use the TSB hardware assist features of the UltraSPARC
MMUs.

SMP is currently knowingly broken, we need to find another place
to store the per-cpu base pointers.  We hid them away in the TSB
base register, and that obviously will not work any more :-)

Another known broken case is non-8KB base page size.

Also noticed that flush_tlb_all() is not referenced anywhere, only
the internal __flush_tlb_all() (local cpu only) is used by the
sparc64 port, so we can get rid of flush_tlb_all().

The kernel gets it's own 8KB TSB (swapper_tsb) and each address space
gets it's own private 8K TSB.  Later we can add code to dynamically
increase the size of per-process TSB as the RSS grows.  An 8KB TSB is
good enough for up to about a 4MB RSS, after which the TSB starts to
incur many capacity and conflict misses.

We even accumulate OBP translations into the kernel TSB.

Another area for refinement is large page size support.  We could use
a secondary address space TSB to handle those.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:13 -08:00
Bernhard R Link
94bbc1763b [SPARC64]: fix sparc_floppy_irq's auxio_register reseting
The patch "[SPARC64]: Get rid of fast IRQ feature"
moved the the code from arch/sparc64/kernel/entry.S:
      lduba           [%g7] ASI_PHYS_BYPASS_EC_E, %g5
      or              %g5, AUXIO_AUX1_FTCNT, %g5
      stba            %g5, [%g7] ASI_PHYS_BYPASS_EC_E
      andn            %g5, AUXIO_AUX1_FTCNT, %g5
      stba            %g5, [%g7] ASI_PHYS_BYPASS_EC_E
to arch/sparc64/kernel/irq.c:
              val = readb(auxio_register);
              val |= AUXIO_AUX1_FTCNT;
              writeb(val, auxio_register);
              val &= AUXIO_AUX1_FTCNT;
              writeb(val, auxio_register);
This looks like it it missing a bitwise not, which is reintroduced
by this patch.

Due to lack of a floppy device, I could not test it, but it looks
evident.

Signed-off-by: Bernhard R Link <brlink@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:10:34 -08:00
David S. Miller
4d000d5b96 [SPARC64]: Mark __ex_table section correctly.
We must use the "a" (allocate) attribute every time we
emit an entry into the __ex_table section.

For consistency, use "a" instead of #alloc which is some
Solaris compat cruft GNU as provides on Sparc.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-04 23:23:56 -08:00
Linus Torvalds
13f939b5d3 Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2006-02-26 20:27:11 -08:00
Linus Torvalds
add2b6fdae Make Kprobes depend on modules
Commit 9ec4b1f356 made kprobes not compile
without module support, so just make that clear in the Kconfig file.

Also, since it's marked EXPERIMENTAL, make that dependency explicit too.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-26 20:24:40 -08:00
David S. Miller
7abea92145 [SPARC64]: Make cpu_present_map available earlier.
The change to kernel/sched.c's init code to use for_each_cpu()
requires that the cpu_possible_map be setup much earlier.

Set it up via setup_arch(), constrained to NR_CPUS, and later
constrain it to max_cpus in smp_prepare_cpus().

This fixes SMP booting on sparc64.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-26 19:36:00 -08:00
David S. Miller
40ad7a6afc [SPARC]: sys_newfstatat --> sys_fstatat64
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-12 23:30:11 -08:00
Heiko Carstens
642fe301c3 [SPARC64]: Fix sys_newfstatat syscall table entry for 64-bit.
The sparc64 64 bit syscall table seems to be broken as it has
compat_sys_newfstatat in its syscall table instead of sys_newfstatat.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-09 15:09:15 -08:00
David S. Miller
0fc9b55606 [SPARC64]: Update defconfig.
Do not enable CONFIG_LOCALVERSION_AUTO by default.
When doing kernel development it just leaves a ton
of crap around.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-07 18:12:34 -08:00
David S. Miller
1b9a428901 [SPARC]: Wire up sys_unshare().
Also, the Solaris syscall table is sized differrently,
and does not go beyond entry 255, so trim off the excess
entries.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-07 18:11:24 -08:00
David S. Miller
7f7ff6bf02 [SPARC64]: Update defconfig.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-05 00:15:12 -08:00
David S. Miller
3794689dba [SPARC64]: Add .gitignore file for sparc64 boot images.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-05 00:15:11 -08:00
David S. Miller
cddfc12e25 [SPARC64]: Kill compat_sys_clock_settime sign extension stub.
It's wrong and totally unneeded.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-30 01:31:09 -08:00
David S. Miller
4415863773 [SPARC]: Increase NR_SYSCALLS to 299
To let new syscalls through.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-22 12:12:01 -08:00
David S. Miller
3ee68c4af3 [SPARC64]: Use compat_sys_futimesat in 32-bit syscall table.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-20 01:49:15 -08:00
David S. Miller
2d7d5f0511 [SPARC]: Add support for *at(), ppoll, and pselect syscalls.
This also includes by necessity _TIF_RESTORE_SIGMASK support,
which actually resulted in a lot of cleanups.

The sparc signal handling code is quite a mess and I should
clean it up some day.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-19 02:42:49 -08:00
Ulrich Drepper
5590ff0d55 [PATCH] vfs: *at functions: core
Here is a series of patches which introduce in total 13 new system calls
which take a file descriptor/filename pair instead of a single file
name.  These functions, openat etc, have been discussed on numerous
occasions.  They are needed to implement race-free filesystem traversal,
they are necessary to implement a virtual per-thread current working
directory (think multi-threaded backup software), etc.

We have in glibc today implementations of the interfaces which use the
/proc/self/fd magic.  But this code is rather expensive.  Here are some
results (similar to what Jim Meyering posted before).

The test creates a deep directory hierarchy on a tmpfs filesystem.  Then
rm -fr is used to remove all directories.  Without syscall support I get
this:

real    0m31.921s
user    0m0.688s
sys     0m31.234s

With syscall support the results are much better:

real    0m20.699s
user    0m0.536s
sys     0m20.149s

The interfaces are for obvious reasons currently not much used.  But they'll
be used.  coreutils (and Jeff's posixutils) are already using them.
Furthermore, code like ftw/fts in libc (maybe even glob) will also start using
them.  I expect a patch to make follow soon.  Every program which is walking
the filesystem tree will benefit.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@ftp.linux.org.uk>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-18 19:20:29 -08:00
Linus Torvalds
3da38566df Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2006-01-18 15:08:02 -08:00
David S. Miller
959a85ada5 [SPARC64]: Fix build with CONFIG_COMPAT disabled.
Based upon a report and preliminary patch from Jim Gifford.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-18 14:58:05 -08:00
Eddie C. Dost
c126cf80d4 [SPARC64]: Serial Console for E250 Patch
From: Eddie C. Dost <ecd@brainaid.de>

I have the following patch for serial console over the RSC
(remote system controller) on my E250 machine. It basically adds
support for input-device=rsc and output-device=rsc from OBP, and
allows 115200,8,n,1,- serial mode setting.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-18 14:54:31 -08:00
David S. Miller
c07a8475dd [SPARC64]: Update defconfig.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-18 13:41:36 -08:00
Jesse Brandeburg
35ec56bb78 [PATCH] e1000: Added disable packet split capability
Adds the ability to disability packet split at compile time and use the legacy receive path on PCI express hardware.  Made this a CONFIG option and modified the Kconfig, to reflect the new option.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2006-01-18 16:17:57 -05:00
Richard Mortimer
9eb3394bf2 [SPARC64]: Eliminate race condition reading Hummingbird STICK register
Ensure a consistent value is read from the STICK register by ensuring
that both high and low are read without high changing due to a roll
over of the low register.

Various Debian/SPARC users (myself include) have noticed problems with
Hummingbird based systems. The symptoms are that the system time is
seen to jump forward 3 days, 6 hours, 11 minutes give or take a few
seconds. In many cases the system then hangs some time afterwards.

I've spotted a race condition in the code to read the STICK register.
I could not work out why 3d, 6h, 11m is important but guess that it is
due to the 2^32 jump of STICK (forwards on one read and then the next
read will seem to be backwards) during a timer interrupt. I'm guessing
that a change of -2^32 will get converted to a large unsigned
increment after the arithmetic manipulation between STICK,
nanoseconds, jiffies etc.

I did a test where I modified __hbird_read_stick to artificially
inject rollover faults forcefully every few seconds. With this I saw
the clock jump over 6 times in 12 hours compared to once every month
or so.

Signed-off-by: Richard Mortimer <richm@oldelvet.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-17 15:21:01 -08:00
Al Viro
26ecbdea4b [PATCH] sparc64: task_pt_regs()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-12 09:08:52 -08:00
Al Viro
ee3eea165e [PATCH] sparc64: task_stack_page()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-12 09:08:52 -08:00
Al Viro
f3169641c1 [PATCH] sparc64: task_thread_info()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-12 09:08:52 -08:00
Randy Dunlap
a941564458 [PATCH] capable/capability.h (arch/)
arch: Use <linux/capability.h> where capable() is used.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-11 18:42:14 -08:00
Keshavamurthy Anil S
eb3a72921c [PATCH] kprobes: fix race in recovery of reentrant probe
There is a window where a probe gets removed right after the probe is hit
on some different cpu.  In this case probe handlers can't find a matching
probe instance related to break address.  In this case we need to read the
original instruction at break address to see if that is not a break/int3
instruction and recover safely.

Previous code had a bug where we were not checking for the above race in
case of reentrant probes and the below patch fixes this race.

Tested on IA64, Powerpc, x86_64.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-11 18:42:12 -08:00
Adrian Bunk
61943c5015 [SPARC64] arch/sparc64/Kconfig: fix HUGETLB_PAGE_SIZE_64K dependencies
This patch fixes a typo in the dependencies of HUGETLB_PAGE_SIZE_64K.

It might be more logical to rename the HUGETLB_PAGE_SIZE_*K
dependencies to HUGETLB_PAGE_SIZE_*KB, but let's fix this bug first.

This bug was reported by Jean-Luc Leger <reiga@dspnet.fr.eu.org>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-11 15:55:23 -08:00
Linus Torvalds
dd49f96777 Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2006-01-10 08:28:53 -08:00
Anil S Keshavamurthy
e597c2984c [PATCH] kprobes: arch_remove_kprobe
Currently arch_remove_kprobes() is only implemented/required for x86_64 and
powerpc.  All other architecture like IA64, i386 and sparc64 implementes a
dummy function which is being called from arch independent kprobes.c file.

This patch removes the dummy functions and replaces it with
#define arch_remove_kprobe(p, s)	do { } while(0)

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:40 -08:00
Anil S Keshavamurthy
49a2a1b83b [PATCH] kprobes: changed from using spinlock to mutex
Since Kprobes runtime exception handlers is now lock free as this code path is
now using RCU to walk through the list, there is no need for the
register/unregister{_kprobe} to use spin_{lock/unlock}_isr{save/restore}.  The
serialization during registration/unregistration is now possible using just a
mutex.

In the above process, this patch also fixes a minor memory leak for x86_64 and
powerpc.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:40 -08:00
Christoph Hellwig
e6a6d2efcb [PATCH] sanitize building of fs/compat_ioctl.c
Now that all these entries in the arch ioctl32.c files are gone [1], we can
build fs/compat_ioctl.c as a normal object and kill tons of cruft.  We need a
special do_ioctl32_pointer handler for s390 so the compat_ptr call is done.
This is not needed but harmless on all other architectures.  Also remove some
superflous includes in fs/compat_ioctl.c

Tested on ppc64.

[1] parisc still had it's PPP handler left, which is not fully correct
    for ppp and besides that ppp uses the generic SIOCPRIV ioctl so it'd
    kick in for all netdevice users.  We can introduce a proper handler
    in one of the next patch series by adding a compat_ioctl method to
    struct net_device but for now let's just kill it - parisc doesn't
    compile in mainline anyway and I don't want this to block this
    patchset.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@debian.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:33 -08:00
Christoph Hellwig
3a0f69d59b [PATCH] common compat_sys_timer_create
The comment in compat.c is wrong, every architecture provides a
get_compat_sigevent() for the IPC compat code already.

This basically moves the x86_64 version to common code and removes all the
others.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:32 -08:00
akpm@osdl.org
df2e71fb91 [PATCH] dump_thread() cleanup
)

From: Adrian Bunk <bunk@stusta.de>

- create one common dump_thread() prototype in kernel.h

- dump_thread() is only used in fs/binfmt_aout.c and can therefore be
  removed on all architectures where CONFIG_BINFMT_AOUT is not
  available

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:25 -08:00
David S. Miller
cdade109d3 [SPARC64]: Fix sys_fstat64() entry in 64-bit syscall table.
Noticed by Jakub Jelinek.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 20:43:57 -08:00
Linus Torvalds
977127174a Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6 2006-01-09 18:41:42 -08:00
David S. Miller
3ebc284d52 [SPARC64]: Update defconfig.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:36:49 -08:00
Richard Mortimer
695ca07bf1 [SPARC64]: Fix ptrace/strace
Don't clobber register %l0 while checking TI_SYS_NOERROR value in
syscall return path.  This bug was introduced by:

db7d9a4eb7

Problem narrowed down by Luis F. Ortiz and Richard Mortimer.

I tried using %l2 as suggested by Luis and that works for me.

Looking at the code I wonder if it makes sense to simplify the code
a little bit. The following works for me but I'm not sure how to
exercise the "NOERROR" codepath.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:35:50 -08:00
David S. Miller
90bf811664 [SPARC64]: Add needed pm_power_off symbol.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-09 14:12:50 -08:00
Jiri Slaby
d08fa1a22e [PATCH] PCI: pci_find_device remove (sparc64/kernel/ebus.c)
Signed-off-by: Jiri Slaby <xslaby@fi.muni.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-09 12:13:15 -08:00
Matt Mackall
e585e47031 [PATCH] tiny: Make *[ug]id16 support optional
Configurable 16-bit UID and friends support

This allows turning off the legacy 16 bit UID interfaces on embedded platforms.

   text    data     bss     dec     hex filename
3330172  529036  190556 4049764  3dcb64 vmlinux-baseline
3328268  529040  190556 4047864  3dc3f8 vmlinux

From: Adrian Bunk <bunk@stusta.de>

    UID16 was accidentially disabled for !EMBEDDED.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 20:14:11 -08:00
Christoph Hellwig
6b9c7ed848 [PATCH] use ptrace_get_task_struct in various places
The ptrace_get_task_struct() helper that I added as part of the ptrace
consolidation is useful in variety of places that currently opencode it.
Switch them to the common helpers.

Add a ptrace_traceme() helper that needs to be explicitly called, and simplify
the ptrace_get_task_struct() interface.  We don't need the request argument
now, and we return the task_struct directly, using ERR_PTR() for error
returns.  It's a bit more code in the callers, but we have two sane routines
that do one thing well now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 20:13:51 -08:00
David S. Miller
d5784b57d2 [SPARC]: Use STABS_DEBUG and DWARF_DEBUG macros in vmlinux.lds.S
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-28 13:22:54 -08:00
David S. Miller
597d1f0622 [SPARC]: Kill CHILD_MAX.
It's definition is wrong (-1 means "no limit" not 999),
only the Sparc SunOS/Solaris compat code uses it, so
let's just kill it off completely from limits.h and
all referencing code.

Noticed by Ulrich Drepper.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-22 23:10:03 -08:00
Adrian Bunk
0b57ee9e55 [SPARC]: introduce a SPARC Kconfig symbol
Introduce a Kconfig symbol SPARC that is defined on both the sparc and
sparc64 architectures.

This symbol makes some dependencies more readable.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-22 23:09:54 -08:00
David S. Miller
a9c9dff1bc [SPARC64]: Stop putting -finline-limit=XXX into CFLAGS
It was a stupid workaround for the "static inline" vs.
"extern inline" issues of long ago, and it is what causes
schedule() to be inlined like crazy into kernel/sched.c
when -Os is specified.

MIPS and S390 should probably do the same.

Now CC_OPTIMIZE_FOR_SIZE can be safely used on sparc64
once more.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-20 14:53:05 -08:00
Keshavamurthy Anil S
bf8d5c52c3 [PATCH] kprobes: increment kprobe missed count for multiprobes
When multiple probes are registered at the same address and if due to some
recursion (probe getting triggered within a probe handler), we skip calling
pre_handlers and just increment nmissed field.

The below patch make sure it walks the list for multiple probes case.
Without the below patch we get incorrect results of nmissed count for
multiple probe case.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-12-12 08:57:45 -08:00
David S. Miller
cab3f16feb [SPARC64]: Fix >8K I/O mappings.
Increment the PFN field of the PTE so that the tests
on vm_pfn in mm/memory.c match up.  The TLB ignores these
lower bits for larger page sizes, so it's OK to set things
like this.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-29 13:59:03 -08:00
David S. Miller
5cd9194a1b [PATCH] sparc: convert IO remapping to VM_PFNMAP
Here are the Sparc bits.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-28 14:35:36 -08:00
Hugh Dickins
f3d48f0373 [PATCH] unpaged: fix sound Bad page states
Earlier I unifdefed PageCompound, so that snd_pcm_mmap_control_nopage and
others can give out a 0-order component of a higher-order page, which won't
be mistakenly freed when zap_pte_range unmaps it.  But many Bad page states
reported a PG_reserved was freed after all: I had missed that we need to
say __GFP_COMP to get compound page behaviour.

Some of these higher-order pages are allocated by snd_malloc_pages, some by
snd_malloc_dev_pages; or if SBUS, by sbus_alloc_consistent - but that has
no gfp arg, so add __GFP_COMP into its sparc32/64 implementations.

I'm still rather puzzled that DRM seems not to need a similar change.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-22 09:13:43 -08:00
Hugh Dickins
0b14c179a4 [PATCH] unpaged: VM_UNPAGED
Although we tend to associate VM_RESERVED with remap_pfn_range, quite a few
drivers set VM_RESERVED on areas which are then populated by nopage.  The
PageReserved removal in 2.6.15-rc1 changed VM_RESERVED not to free pages in
zap_pte_range, without changing those drivers not to set it: so their pages
just leak away.

Let's not change miscellaneous drivers now: introduce VM_UNPAGED at the core,
to flag the special areas where the ptes may have no struct page, or if they
have then it's not to be touched.  Replace most instances of VM_RESERVED in
core mm by VM_UNPAGED.  Force it on in remap_pfn_range, and the sparc and
sparc64 io_remap_pfn_range.

Revert addition of VM_RESERVED to powerpc vdso, it's not needed there.  Is it
needed anywhere?  It still governs the mm->reserved_vm statistic, and special
vmas not to be merged, and areas not to be core dumped; but could probably be
eliminated later (the drivers are probably specifying it because in 2.4 it
kept swapout off the vma, but in 2.6 we work from the LRU, which these pages
don't get on).

Use the VM_SHM slot for VM_UNPAGED, and define VM_SHM to 0: it serves no
purpose whatsoever, and should be removed from drivers when we clean up.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-22 09:13:42 -08:00
Christoph Hellwig
9ffb83bcc5 [SBUSFB]: implement ->compat_ioctl
This patch adds a new function, sbusfb_compat_ioctl() to
drivers/video/sbuslib.c and uses it as compat_ioctl in all sbus fb
drivers

This remove the last per-arch compat ioctl bits in
arch/sparc64/kernel/ioctl32.c so it would be nice if people could test
if this actually copiles and works and if yes apply it :)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-12 12:11:12 -08:00
David S. Miller
4d45cbacb8 [SPARC64]: Restore 2.4.x /proc/cpuinfo behavior for "ncpus probed" field.
Noticed by Tom 'spot' Callaway.

Even on uniprocessor we always reported the number of physical
cpus in the system via /proc/cpuinfo.  But when this got changed
to use num_possible_cpus() it always reads as "1" on uniprocessor.
This change was unintentional.

So scan the firmware device tree and count the number of cpu
nodes, and report that, as we always did.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-11 12:48:56 -08:00
Christoph Hellwig
8ca2bdc7a9 [SPARC] sbus rtc: implement ->compat_ioctl
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-09 12:07:18 -08:00
Tobias Klauser
84c1a13a30 [SPARC64]: Use ARRAY_SIZE macro
Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove a
duplicate of ARRAY_SIZE which is never used anyways.

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-09 12:03:42 -08:00
Nick Piggin
64c7c8f885 [PATCH] sched: resched and cpu_idle rework
Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce
confusion, and make their semantics rigid.  Improves efficiency of
resched_task and some cpu_idle routines.

* In resched_task:
- TIF_NEED_RESCHED is only cleared with the task's runqueue lock held,
  and as we hold it during resched_task, then there is no need for an
  atomic test and set there. The only other time this should be set is
  when the task's quantum expires, in the timer interrupt - this is
  protected against because the rq lock is irq-safe.

- If TIF_NEED_RESCHED is set, then we don't need to do anything. It
  won't get unset until the task get's schedule()d off.

- If we are running on the same CPU as the task we resched, then set
  TIF_NEED_RESCHED and no further action is required.

- If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set
  after TIF_NEED_RESCHED has been set, then we need to send an IPI.

Using these rules, we are able to remove the test and set operation in
resched_task, and make clear the previously vague semantics of
POLLING_NRFLAG.

* In idle routines:
- Enter cpu_idle with preempt disabled. When the need_resched() condition
  becomes true, explicitly call schedule(). This makes things a bit clearer
  (IMO), but haven't updated all architectures yet.

- Many do a test and clear of TIF_NEED_RESCHED for some reason. According
  to the resched_task rules, this isn't needed (and actually breaks the
  assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock
  held). So remove that. Generally one less locked memory op when switching
  to the idle thread.

- Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner
  most polling idle loops. The above resched_task semantics allow it to be
  set until before the last time need_resched() is checked before going into
  a halt requiring interrupt wakeup.

  Many idle routines simply never enter such a halt, and so POLLING_NRFLAG
  can be always left set, completely eliminating resched IPIs when rescheduling
  the idle task.

  POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:56:33 -08:00
Nick Piggin
5bfb5d690f [PATCH] sched: disable preempt in idle tasks
Run idle threads with preempt disabled.

Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()).
How did it ever work before?

Might fix the CPU hotplugging hang which Nigel Cunningham noted.

We think the bug hits if the idle thread is preempted after checking
need_resched() and before going to sleep, then the CPU offlined.

After calling stop_machine_run, the CPU eventually returns from preemption and
into the idle thread and goes to sleep.  The CPU will continue executing
previous idle and have no chance to call play_dead.

By disabling preemption until we are ready to explicitly schedule, this bug is
fixed and the idle threads generally become more robust.

From: alexs <ashepard@u.washington.edu>

  PPC build fix

From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>

  MIPS build fix

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:56:33 -08:00
Christoph Hellwig
7e4c54a2a4 [PATCH] remove ioctl32_handler_t
Some architectures define and use this type in their compat_ioctl code, but
all of them can easily use the identical ioctl_trans_handler_t type that is
defined in common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:56:00 -08:00
Hugh Dickins
da1605465e [SPARC64] mm: update get_user_insn comment
Update comment on get_user_insn to the more general "pte lock", which may
or may not be the page_table_lock.  Note vmtruncate handled like kswapd.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-08 10:00:55 -08:00
David S. Miller
dd3e2dcf34 [SPARC64]: Kill some unnecessary includes from ioctl32.c
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:13:46 -08:00
Christoph Hellwig
f48497e383 [SPARC64]: remove drm compat ioctl handling
drivers/drm/ now implements proper ->compat_ioctl methods, so this isn't
needed anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:13:27 -08:00
Christoph Hellwig
b66621fef3 [SPARC] cpwatchdog: implement ->compat_ioctl
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:13:14 -08:00
Christoph Hellwig
1d5d00bd9c [SPARC] display7seg: implement ->unlocked_ioctl and ->compat_ioctl
all ioctls are 32bit compat clean, so the driver can use ->compat_ioctl
and ->unlocked_ioctl easily.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:13:01 -08:00
Christoph Hellwig
b31023fc24 [SPARC] openprom: implement ->compat_ioctl
implement a compat_ioctl handle in the driver instead of having table
entries in sparc64 ioctl32.c (I plan to get rid of the arch ioctl32.c
file eventually)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:12:47 -08:00
Christoph Hellwig
1928f8e541 [SPARC] envctrl: implement ->unlocked_ioctl and ->compat_ioctl
all the ioctls in the driver are 32bit compat clean and don't need BKL,
so we can switch it to ->unlocked_ioctl and ->compat_ioctl trivially.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:12:34 -08:00
Christoph Hellwig
16cf0d8165 [SPARC]: Kill remaining kbio.h references.
Would you mind applying the following patch that kills those two + the
m68k and Documentation/ references?

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:12:21 -08:00
Christoph Hellwig
261b033afc [SPARC64]: remove duplicated compat ioctl entries
all these are handled by fs/compat_ioctls.c already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:11:49 -08:00
Christoph Hellwig
59f85dc95e [SPARC]: remove vuid_event.h
I don't know if we ever implemented this, but the only user in any 2.6
tree are the compat ioctls.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:11:38 -08:00
Christoph Hellwig
e1413315b8 [SPARC]: remove kbio.h
The old keyboard driver is gone in 2.6, so the only user left are the
compat ioctls.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:11:25 -08:00
Christoph Hellwig
9d3c7d1bfd [SPARC]: remove audioio.h
The old sound drivers are gone in 2.6, so the only user left are the
compat ioctls.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:11:14 -08:00
Christoph Hellwig
e0436b3164 [SPARC64]: remove alloc_user_space()
this inline routine in arch/sparc64/kernel/ioctl32.c is completely
unused and superceeded by compat_alloc_user_space()

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:11:02 -08:00
David S. Miller
fc3214952f [SPARC64]: Kill off dummy_tick_ops.
It only serves to generate false-positive buildcheck warnings.
Just set it initially to tick_operations which uses the v9
%tick register which every sparc64 processor has.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:10:10 -08:00
David S. Miller
62dbec78be [SPARC64] mm: Do not flush TLB mm in tlb_finish_mmu()
It isn't needed any longer, as noted by Hugh Dickins.

We still need the flush routines, due to the one remaining
call site in hugetlb_prefault_arch_hook().  That can be
eliminated at some later point, however.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:09:58 -08:00
Hugh Dickins
dedeb0029b [SPARC64] mm: context switch ptlock
sparc64 is unique among architectures in taking the page_table_lock in
its context switch (well, cris does too, but erroneously, and it's not
yet SMP anyway).

This seems to be a private affair between switch_mm and activate_mm,
using page_table_lock as a per-mm lock, without any relation to its uses
elsewhere.  That's fine, but comment it as such; and unlock sooner in
switch_mm, more like in activate_mm (preemption is disabled here).

There is a block of "if (0)"ed code in smp_flush_tlb_pending which would
have liked to rely on the page_table_lock, in switch_mm and elsewhere;
but its comment explains how dup_mmap's flush_tlb_mm defeated it.  And
though that could have been changed at any time over the past few years,
now the chance vanishes as we push the page_table_lock downwards, and
perhaps split it per page table page.  Just delete that block of code.

Which leaves the mysterious spin_unlock_wait(&oldmm->page_table_lock)
in kernel/fork.c copy_mm.  Textual analysis (supported by Nick Piggin)
suggests that the comment was written by DaveM, and that it relates to
the defeated approach in the sparc64 smp_flush_tlb_pending.  Just delete
this block too.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:09:01 -08:00
Hugh Dickins
b8ae48656d [SPARC64] mm: don't re-evaluate *ptep
sparc64 prom_callback and new_setup_frame32 each operates on a user page
table without holding lock, and no doubt they've good reason.  But I'd
feel more confident if they were to do a "pte = *ptep" and then operate
on pte, rather than re-evaluating *ptep.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-07 14:08:46 -08:00
Jesper Juhl
b2325fe1b7 [PATCH] kfree cleanup: arch
This is the arch/ part of the big kfree cleanup patch.

Remove pointless checks for NULL prior to calling kfree() in arch/.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:54:06 -08:00
Ananth N Mavinakayanahalli
d217d5450f [PATCH] Kprobes: preempt_disable/enable() simplification
Reorganize the preempt_disable/enable calls to eliminate the extra preempt
depth.  Changes based on Paul McKenney's review suggestions for the kprobes
RCU changeset.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:46 -08:00
Ananth N Mavinakayanahalli
991a51d83a [PATCH] Kprobes: Use RCU for (un)register synchronization - arch changes
Changes to the arch kprobes infrastructure to take advantage of the locking
changes introduced by usage of RCU for synchronization.  All handlers are now
run without any locks held, so they have to be re-entrant or provide their own
synchronization.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:46 -08:00
Ananth N Mavinakayanahalli
f215d985e9 [PATCH] Kprobes: Track kprobe on a per_cpu basis - sparc64 changes
Sparc64 changes to track kprobe execution on a per-cpu basis.  We now track
the kprobe state machine independently on each cpu using an arch specific
kprobe control block.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:46 -08:00
Ananth N Mavinakayanahalli
66ff2d0691 [PATCH] Kprobes: rearrange preempt_disable/enable() calls
The following set of patches are aimed at improving kprobes scalability.  We
currently serialize kprobe registration, unregistration and handler execution
using a single spinlock - kprobe_lock.

With these changes, kprobe handlers can run without any locks held.  It also
allows for simultaneous kprobe handler executions on different processors as
we now track kprobe execution on a per processor basis.  It is now necessary
that the handlers be re-entrant since handlers can run concurrently on
multiple processors.

All changes have been tested on i386, ia64, ppc64 and x86_64, while sparc64
has been compile tested only.

The patches can be viewed as 3 logical chunks:

patch 1: 	Reorder preempt_(dis/en)able calls
patches 2-7: 	Introduce per_cpu data areas to track kprobe execution
patches 8-9: 	Use RCU to synchronize kprobe (un)registration and handler
		execution.

Thanks to Maneesh Soni, James Keniston and Anil Keshavamurthy for their
review and suggestions. Thanks again to Anil, Hien Nguyen and Kevin Stafford
for testing the patches.

This patch:

Reorder preempt_disable/enable() calls in arch kprobes files in preparation to
introduce locking changes.  No functional changes introduced by this patch.

Signed-off-by: Ananth N Mavinakayahanalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:45 -08:00
Prasanna S Panchamukhi
cd6b0762a0 [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu
Andrew Morton suggested to move kprobes from kernel hacking menu, since
kernel hacking menu is in-appropriate for the Kprobes.  This patch moves
Kprobes and Oprofile under instrumentation menu.

(akpm: it's not a natural fit, but things like djprobes and the s390 guys'
statistics library need a home)

Signed-of-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Philippe Elie <phil.el@wanadoo.fr>
Cc: John Levon <levon@movementarian.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-07 07:53:35 -08:00
Thomas Gleixner
ecea8d19c9 [PATCH] jiffies_64 cleanup
Define jiffies_64 in kernel/timer.c rather than having 24 duplicated
defines in each architecture.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:25 -08:00
Christoph Hellwig
9c0cbd54ce [PATCH] TIOC* compat ioctl handling
TIOCSTART and TIOCSTOP are defined in asm/ioctls.h and asm/termios.h by
various architectures but not actually implemented anywhere but in the IRIX
compatibility layer, so remove their COMPATIBLE_IOCTL from parisc, ppc64
and sparc64.

Move the TIOCSLTC COMPATIBLE_IOCTL to common code, guided by an ifdef to
only show up on architectures that support it (same as the code handling it
in tty_ioctl.c), aswell as it's brother TIOCGLTC that wasn't handled so
far.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:17 -08:00
Hugh Dickins
b462705ac6 [PATCH] mm: arches skip ptlock
Convert those few architectures which are calling pud_alloc, pmd_alloc,
pte_alloc_map on a user mm, not to take the page_table_lock first, nor drop it
after.  Each of these can continue to use pte_alloc_map, no need to change
over to pte_alloc_map_lock, they're neither racy nor swappable.

In the sparc64 io_remap_pfn_range, flush_tlb_range then falls outside of the
page_table_lock: that's okay, on sparc64 it's like flush_tlb_mm, and that has
always been called from outside of page_table_lock in dup_mmap.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:40 -07:00
Nick Piggin
b5810039a5 [PATCH] core remove PageReserved
Remove PageReserved() calls from core code by tightening VM_RESERVED
handling in mm/ to cover PageReserved functionality.

PageReserved special casing is removed from get_page and put_page.

All setting and clearing of PageReserved is retained, and it is now flagged
in the page_alloc checks to help ensure we don't introduce any refcount
based freeing of Reserved pages.

MAP_PRIVATE, PROT_WRITE of VM_RESERVED regions is tentatively being
deprecated.  We never completely handled it correctly anyway, and is be
reintroduced in future if required (Hugh has a proof of concept).

Once PageReserved() calls are removed from kernel/power/swsusp.c, and all
arch/ and driver code, the Set and Clear calls, and the PG_reserved bit can
be trivially removed.

Last real user of PageReserved is swsusp, which uses PageReserved to
determine whether a struct page points to valid memory or not.  This still
needs to be addressed (a generic page_is_ram() should work).

A last caveat: the ZERO_PAGE is now refcounted and managed with rmap (and
thus mapcounted and count towards shared rss).  These writes to the struct
page could cause excessive cacheline bouncing on big systems.  There are a
number of ways this could be addressed if it is an issue.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Refcount bug fix for filemap_xip.c

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:39 -07:00
Hugh Dickins
404351e67a [PATCH] mm: mm_init set_mm_counters
How is anon_rss initialized?  In dup_mmap, and by mm_alloc's memset; but
that's not so good if an mm_counter_t is a special type.  And how is rss
initialized?  By set_mm_counter, all over the place.  Come on, we just need to
initialize them both at once by set_mm_counter in mm_init (which follows the
memcpy when forking).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:38 -07:00
Hugh Dickins
fc2acab31b [PATCH] mm: tlb_finish_mmu forget rss
zap_pte_range has been counting the pages it frees in tlb->freed, then
tlb_finish_mmu has used that to update the mm's rss.  That got stranger when I
added anon_rss, yet updated it by a different route; and stranger when rss and
anon_rss became mm_counters with special access macros.  And it would no
longer be viable if we're relying on page_table_lock to stabilize the
mm_counter, but calling tlb_finish_mmu outside that lock.

Remove the mmu_gather's freed field, let tlb_finish_mmu stick to its own
business, just decrement the rss mm_counter in zap_pte_range (yes, there was
some point to batching the update, and a subsequent patch restores that).  And
forget the anal paranoia of first reading the counter to avoid going negative
- if rss does go negative, just fix that bug.

Remove the mmu_gather's flushes and avoided_flushes from arm and arm26: no use
was being made of them.  But arm26 alone was actually using the freed, in the
way some others use need_flush: give it a need_flush.  arm26 seems to prefer
spaces to tabs here: respect that.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:37 -07:00
Hugh Dickins
4d6ddfa924 [PATCH] mm: tlb_is_full_mm was obscure
tlb_is_full_mm?  What does that mean?  The TLB is full?  No, it means that the
mm's last user has gone and the whole mm is being torn down.  And it's an
inline function because sparc64 uses a different (slightly better)
"tlb_frozen" name for the flag others call "fullmm".

And now the ptep_get_and_clear_full macro used in zap_pte_range refers
directly to tlb->fullmm, which would be wrong for sparc64.  Rather than
correct that, I'd prefer to scrap tlb_is_full_mm altogether, and change
sparc64 to just use the same poor name as everyone else - is that okay?

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:37 -07:00
Al Viro
53f9fc93f9 [PATCH] gfp_t: remaining bits of arch/*
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-28 08:16:51 -07:00
David S. Miller
b4d1b82578 [SPARC64]: Fix powering off on SMP.
Doing a "SUNW,stop-self" firmware call on the other cpus is not the
correct thing to do when dropping into the firmware for a halt,
reboot, or power-off.

For now, just do nothing to quiet the other cpus, as the system should
be quiescent enough.  Later we may decide to implement smp_send_stop()
like the other SMP platforms do.

Based upon a report from Christopher Zimmermann.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-14 15:26:08 -07:00
David S. Miller
688cb30bdc [SPARC64]: Eliminate PCI IOMMU dma mapping size limit.
The hairy fast allocator in the sparc64 PCI IOMMU code
has a hard limit of 256 pages.  Certain devices can
exceed this when performing very large I/Os.

So replace with a more simple allocator, based largely
upon the arch/ppc64/kernel/iommu.c code.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-13 22:15:24 -07:00
David S. Miller
51e8513615 [SPARC64]: Consolidate common PCI IOMMU init code.
All the PCI controller drivers were doing the same thing
setting up the IOMMU software state, put it all in one spot.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-13 21:10:08 -07:00
David S. Miller
c9c1083074 [SPARC64]: Fix boot failures on SunBlade-150
The sequence to move over to the Linux trap tables from
the firmware ones needs to be more air tight.  It turns
out that to be %100 safe we do need to be able to translate
OBP mappings in our TLB miss handlers early.

In order not to eat up a lot of kernel image memory with
static page tables, just use the translations array in
the OBP TLB miss handlers.  That solves the bulk of the
problem.

Furthermore, to make sure the OBP TLB miss path will work
even before the fixed MMU globals are loaded, explicitly
load %g1 to TLB_SFSR at the beginning of the i-TLB and
d-TLB miss handlers.

To ease the OBP TLB miss walking of the prom_trans[] array,
we sort it then delete all of the non-OBP entries in there
(for example, there are entries for the kernel image itself
which we're not interested in at all).

We also save about 32K of kernel image size with this change.
Not a bad side effect :-)

There are still some reasons why trampoline.S can't use the
setup_trap_table() yet.  The most noteworthy are:

1) OBP boots secondary processors with non-bias'd stack for
   some reason.  This is easily fixed by using a small bootup
   stack in the kernel image explicitly for this purpose.

2) Doing a firmware call via the normal C call prom_set_trap_table()
   goes through the whole OBP enter/exit sequence that saves and
   restores OBP and Linux kernel state in the MMUs.  This path
   unfortunately does a "flush %g6" while loading up the OBP locked
   TLB entries for the firmware call.

   If we setup the %g6 in the trampoline.S code properly, that
   is in the PAGE_OFFSET linear mapping, but we're not on the
   kernel trap table yet so those addresses won't translate properly.

   One idea is to do a by-hand firmware call like we do in the
   early bootup code and elsewhere here in trampoline.S  But this
   fails as well, as aparently the secondary processors are not
   booted with OBP's special locked TLB entries loaded.  These
   are necessary for the firwmare to processes TLB misses correctly
   up until the point where we take over the trap table.

This does need to be resolved at some point.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 12:22:46 -07:00
David S. Miller
b1b510aa28 [SPARC64]: Fix net booting on Ultra5
We were not doing alignment properly when remapping the kernel image.

What we want is a 4MB aligned physical address to map at KERNBASE.
Mistakedly we were 4MB aligning the virtual address where the kernel
initially sits, that's wrong.

Instead, we should PAGE align the virtual address, then 4MB align the
physical address result the prom gives to us.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-11 15:45:16 -07:00
David S. Miller
5d8e1b181c [SPARC64]: Fix Ultra5, Ultra60, et al. boot failures.
On the boot processor, we need to do the move onto the Linux trap
table a little bit differently else we'll take unhandlable faults in
the firmware address space.

Previously we would do the following:

1) Disable PSTATE_IE in %pstate.
2) Set %tba by hand to sparc64_ttable_tl0
3) Initialize alternate, mmu, and interrupt global
   trap registers.
4) Call prom_set_traptable()

That doesn't work very well actually with the way we boot the kernel
VM these days.  It worked by luck on many systems because the firmware
accesses for the prom_set_traptable() call happened to be loaded into
the TLB already, something we cannot assume.

So the new scheme is this:

1) Clear PSTATE_IE in %pstate and set %pil to 15
2) Call prom_set_traptable()
3) Initialize alternate, mmu, and interrupt global
   trap registers.

and this works quite well.  This sequence has been moved into a
callable function in assembler named setup-trap_table().  The idea is
that eventually trampoline.S can use this code as well.  That isn't
possible currently due to some complications, but eventually we should
be able to do it.

Thanks to Meelis Roos for the Ultra5 boot failure report.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-10 16:12:13 -07:00
Sven Hartge
2e457ef667 [SPARC64]: Fix compile error in irq.c
irq.c is missing the inclusion of asm/io.h, which causes
readb() and writeb() the be undefined.

Signed-off-by: Sven Hartge <hartge@ds9.argh.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-08 21:12:04 -07:00
David S. Miller
ba6399334d [SPARC64]: Fix userland FPU state corruption.
We need to use stricter memory barriers around the block
load and store instructions we use to save and restore the
FPU register file.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-07 13:30:49 -07:00
David S. Miller
2256c13b99 [SPARC64]: Probe for power device on ISA bus too.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-06 20:43:54 -07:00
David S. Miller
9ad98c5b44 [SPARC64]: Fix initrd when net booting.
By allocating early memory for the firmware page tables, we
can write over the beginning of the initrd image.

So what we do now is:

1) Read in firmware translations table while still on the
   firmware's trap table.
2) Switch to Linux trap table.
3) Init bootmem.
4) Build firmware page tables using __alloc_bootmem().

And this keeps the initrd from being clobbered.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-05 15:12:00 -07:00
David S. Miller
0835ae0f27 [SPARC64]: Replace cheetah+ code patching with variables.
Instead of code patching to handle the page size fields in
the context registers, just use variables from which we get
the proper values.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-04 15:23:20 -07:00
David S. Miller
717463d806 [SPARC64]: Fix several bugs in flush_ptrace_access().
1) Use cpudata cache line sizes, not magic constants.
2) Align start address in cheetah case so we do not get
   unaligned address traps.  (pgrep was good at triggering
   this, via /proc/${pid}/cmdline accesses)

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-29 18:50:34 -07:00
David S. Miller
4cb29d1812 [SPARC64]: Kill arch/sparc64/prom/memory.c
No longer used.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-29 18:05:28 -07:00
David S. Miller
13edad7a5c [SPARC64]: Rewrite convoluted physical memory probing.
Delete all of the code working with sp_banks[] and replace
with clean acquisition and sorting of physical memory
parameters from the firmware.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-29 17:58:26 -07:00
David S. Miller
ed3ffaf7b5 [SPARC64]: Solidify check in cheetah_check_main_memory().
Need to make sure the address is below high_memory before
passing it to kern_addr_valid().

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 21:48:25 -07:00
David S. Miller
10147570f9 [SPARC64]: Kill all external references to sp_banks[]
Thus, we can mark sp_banks[] static in arch/sparc64/mm/init.c

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 21:46:43 -07:00
David S. Miller
0836a0eb40 [SPARC64]: Move phys_base, kern_{base,size}, and sp_banks[] init to paging_init
Also, move prom_probe_memory() into arch/sparc64/mm/init.c

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 21:38:08 -07:00
David S. Miller
801ab3c731 [SPARC]: Declare paging_init() in asm/pgtable.h
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 21:31:25 -07:00
David S. Miller
efdc1e2083 [SPARC64]: Simplify user fault fixup handling.
Instead of doing byte-at-a-time user accesses to figure
out where the fault occurred, read the saved fault_address
from the current thread structure.

For the sake of defensive programming, if the fault_address
does not fall into the user buffer range, simply assume the
whole area faulted.  This will cause the fixup for
copy_from_user() to clear the entire kernel side buffer.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 21:06:47 -07:00
David S. Miller
5fd29752f0 [SPARC64]: Fix fault handling in unaligned trap handler.
We were not calling kernel_mna_trap_fault() correctly.
Instead of being fancy, just return 0 vs. -EFAULT from
the assembler stubs, and handle that return value as
appropriate.

Create an "__retl_efault" stub for assembler exception
table entries and use it where possible.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 20:41:45 -07:00
David S. Miller
8cf14af0a7 [SPARC64]: Convert to use generic exception table support.
The funny "range" exception table entries we had were only
used by the compat layer socketcall assembly, and it wasn't
even needed there.

For free we now get proper exception table sorting and fast
binary searching.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 20:21:11 -07:00
David S. Miller
705747ab87 [SPARC64]: Fix bug in unaligned load endianness swapping
The in-memory value was being swapped, not the value we
loaded into the register.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-28 16:48:40 -07:00
David S. Miller
d2212bc7db [SPARC64]: Add missing IDs for newer cpus.
Also, the us3_cpufreq driver can work on Ultra-IV and IV+.
They use the SAFARI bus register to control the clock divider
just like Ultra-III and III+ do.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-27 22:50:06 -07:00
David S. Miller
0dc4610698 [SPARC64]: Do not do TLB pre-filling any more.
In order to do it correctly on UltraSPARC-III+ and later we'd
need to add some complicated code to set the TAG access extension
register before loading the TLB.

Since this optimization gives questionable gains, it's best to
just remove it for now instead of adding the fix for Ultra-III+

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-26 16:12:18 -07:00
David S. Miller
c5bd50a953 [SPARC64]: Simplify Spitfire D-cache page flush.
It tries to batch up the tag loads and comparisons, and
then the stores.  And this is just complicated instead
of efficient.

Also, make the symbol of the Cheetah version more grepable.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-26 16:06:03 -07:00
David S. Miller
80dc0d6b44 [SPARC64]: Probe D/I/E-cache config and use.
At boot time, determine the D-cache, I-cache and E-cache size and
line-size.  Use them in cache flushes when appropriate.

This change was motivated by discovering that the D-cache on
UltraSparc-IIIi and later are 64K not 32K, and the flushes done by the
Cheetah error handlers were assuming a 32K size.

There are still some pieces of code that are hard coding things and
will need to be fixed up at some point.

While we're here, fix the D-cache and I-cache parity error handlers
to run with interrupts disabled, and when the trap occurs at trap
level > 1 log the event via a counter displayed in /proc/cpuinfo.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-26 00:32:17 -07:00
David S. Miller
5642530651 [SPARC64]: Add CONFIG_DEBUG_PAGEALLOC support.
The trick is that we do the kernel linear mapping TLB miss starting
with an instruction sequence like this:

	ba,pt		%xcc, kvmap_load
	 xor		%g2, %g4, %g5

succeeded by an instruction sequence which performs a full page table
walk starting at swapper_pg_dir.

We first take over the trap table from the firmware.  Then, using this
constant PTE generation for the linear mapping area above, we build
the kernel page tables for the linear mapping.

After this is setup, we patch that branch above into a "nop", which
will cause TLB misses to fall through to the full page table walk.

With this, the page unmapping for CONFIG_DEBUG_PAGEALLOC is trivial.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-25 16:46:57 -07:00
David S. Miller
52f26deb7c [SPARC64]: Fix mask formation in tomatillo_wsync_handler()
"1" needs to be "1UL", this is a 64-bit mask we're creating.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-24 23:06:14 -07:00
David S. Miller
898cf0ecb7 [SPARC64]: Mark functions called by paging_init() as __init.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-23 11:59:44 -07:00
David S. Miller
1c9ea5db00 [SPARC64]: Kill unused variable in setup_arch()
'highest_paddr' is set, but never actually used.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-23 11:54:43 -07:00
David S. Miller
a8201c6106 [SPARC64]: Fix comment typo in head.S
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 20:31:29 -07:00
David S. Miller
bff06d5522 [SPARC64]: Rewrite bootup sequence.
Instead of all of this cpu-specific code to remap the kernel
to the correct location, use portable firmware calls to do
this instead.

What we do now is the following in position independant
assembler:

	chosen_node = prom_finddevice("/chosen");
	prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu");
	vaddr = 4MB_ALIGN(current_text_addr());
	prom_translate(vaddr, &paddr_high, &paddr_low, &mode);
	prom_boot_mapping_mode = mode;
	prom_boot_mapping_phys_high = paddr_high;
	prom_boot_mapping_phys_low = paddr_low;
	prom_map(-1, 8 * 1024 * 1024, KERNBASE, paddr_low);

and that replaces the massive amount of by-hand TLB probing and
programming we used to do here.

The new code should also handle properly the case where the kernel
is mapped at the correct address already (think: future kexec
support).

Consequently, the bulk of remap_kernel() dies as does the entirety
of arch/sparc64/prom/map.S

We try to share some strings in the PROM library with the ones used
at bootup, and while we're here mark input strings to oplib.h routines
with "const" when appropriate.

There are many more simplifications now possible.  For one thing, we
can consolidate the two copies we now have of a lot of cpu setup code
sitting in head.S and trampoline.S.

This is a significant step towards CONFIG_DEBUG_PAGEALLOC support.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 20:11:33 -07:00
David S. Miller
40fd3533c9 [SPARC64]: Kill readjust_prom_translations()
Testing shows that the prom_unmap() calls do absolutely
nothing.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 13:03:36 -07:00
David S. Miller
2bdb3cb265 [SPARC64]: Remove unnecessary paging_init() cruft.
Because we don't access the PAGE_OFFSET linear mappings
any longer before we take over the trap table from the
firmware, we don't need to load dummy mappings there
into the TLB and we don't need the bootmap_base hack
any longer either.

While we are here, check for a larger than 8MB kernel
and halt the boot with an error message.  We know that
doesn't work, so instead of failing mysteriously we
should let the user know exactly what's wrong.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:08:57 -07:00
David S. Miller
5085b4a549 [SPARC64]: Do not allocate OBP page tables using bootmem
Just allocate them physically starting from the end of
the kernel image.  This incredibly simplifies our MM
bootstrap in that we don't need any mappings in the linear
PAGE_OFFSET area working in order to bootstrap ourselves and
take over the trap table from the firmware.

Many further simplifications are possible now, and this also
sets the stage for CONFIG_DEBUG_PAGEALLOC support.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 00:45:41 -07:00
David S. Miller
405599bd98 [SPARC64]: Break up inherit_prom_mappings() into it's constituent parts.
This thing was just a huge monolithic mess, so chop it up.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 00:12:35 -07:00
David S. Miller
b206fc4c09 [SPARC64]: Do not allocate prom translations using bootmem.
Use __initdata instead.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-21 22:31:13 -07:00
David S. Miller
1ac4f5ebaa [SPARC64]: Remove ktlb.S instruction patching.
This was kind of ugly, and actually buggy.  The bug was that
we didn't handle a machine with memory starting > 4GB.  If
the 'prompmd' was allocated in physical memory > 4GB we'd
croak because the obp_iaddr_patch and obp_daddr_patch things
only supported a 32-bit physical address.

So fix this by just loading the appropriate values from two
variables in the kernel image, which is locked into the TLB
and thus accesses to them can't cause a recursive TLB miss.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-21 21:49:32 -07:00
David S. Miller
059deb693e [SPARC64]: Kill SZ_BITS define from dtlb_backend.S
This is just a replica of the existing _PAGE_SZBITS,
and thus unnecessary.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-21 19:23:48 -07:00
David S. Miller
2a7e299034 [SPARC64]: Move kernel TLB miss handling into a seperate file.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-21 18:50:51 -07:00
David S. Miller
729b4f7de6 [SPARC64]: Verify vmalloc TLB misses more strictly.
Arrange the modules, OBP, and vmalloc areas such that a range
verification can be done quite minimally.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-20 12:18:38 -07:00
David S. Miller
6a9b490d5f [SPARC64]: Move DCACHE_ALIASING_POSSIBLE define to asm/page.h
This showed that arch/sparc64/kernel/ptrace.c was not getting
the define properly, and thus the code protected by this ifdef
was never actually compiled before.  So fix that too.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-19 20:11:57 -07:00
David S. Miller
ff171d8f66 [SPARC64]: Handle little-endian unaligned loads/stores correctly.
Because we use byte loads/stores to cons up the value
in and out of registers, we can't expect the ASI endianness
setting to take care of this for us.  So do it by hand.

This case is triggered by drivers/block/aoe/aoecmd.c in the
ataid_complete() function where it goes:

		/* word 100: number lba48 sectors */
		ssize = le64_to_cpup((__le64 *) &id[100<<1]);

This &id[100<<1] address is 4 byte, rather than 8 byte aligned,
thus triggering the unaligned exception.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-19 19:56:06 -07:00
David S. Miller
4db2ce0199 [LIB]: Consolidate _atomic_dec_and_lock()
Several implementations were essentialy a common piece of C code using
the cmpxchg() macro.  Put the implementation in one spot that everyone
can share, and convert sparc64 over to using this.

Alpha is the lone arch-specific implementation, which codes up a
special fast path for the common case in order to avoid GP reloading
which a pure C version would require.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-14 21:47:01 -07:00
Ingo Molnar
fb1c8f93d8 [PATCH] spinlock consolidation
This patch (written by me and also containing many suggestions of Arjan van
de Ven) does a major cleanup of the spinlock code.  It does the following
things:

 - consolidates and enhances the spinlock/rwlock debugging code

 - simplifies the asm/spinlock.h files

 - encapsulates the raw spinlock type and moves generic spinlock
   features (such as ->break_lock) into the generic code.

 - cleans up the spinlock code hierarchy to get rid of the spaghetti.

Most notably there's now only a single variant of the debugging code,
located in lib/spinlock_debug.c.  (previously we had one SMP debugging
variant per architecture, plus a separate generic one for UP builds)

Also, i've enhanced the rwlock debugging facility, it will now track
write-owners.  There is new spinlock-owner/CPU-tracking on SMP builds too.
All locks have lockup detection now, which will work for both soft and hard
spin/rwlock lockups.

The arch-level include files now only contain the minimally necessary
subset of the spinlock code - all the rest that can be generalized now
lives in the generic headers:

 include/asm-i386/spinlock_types.h       |   16
 include/asm-x86_64/spinlock_types.h     |   16

I have also split up the various spinlock variants into separate files,
making it easier to see which does what. The new layout is:

   SMP                         |  UP
   ----------------------------|-----------------------------------
   asm/spinlock_types_smp.h    |  linux/spinlock_types_up.h
   linux/spinlock_types.h      |  linux/spinlock_types.h
   asm/spinlock_smp.h          |  linux/spinlock_up.h
   linux/spinlock_api_smp.h    |  linux/spinlock_api_up.h
   linux/spinlock.h            |  linux/spinlock.h

/*
 * here's the role of the various spinlock/rwlock related include files:
 *
 * on SMP builds:
 *
 *  asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
 *                        initializers
 *
 *  linux/spinlock_types.h:
 *                        defines the generic type and initializers
 *
 *  asm/spinlock.h:       contains the __raw_spin_*()/etc. lowlevel
 *                        implementations, mostly inline assembly code
 *
 *   (also included on UP-debug builds:)
 *
 *  linux/spinlock_api_smp.h:
 *                        contains the prototypes for the _spin_*() APIs.
 *
 *  linux/spinlock.h:     builds the final spin_*() APIs.
 *
 * on UP builds:
 *
 *  linux/spinlock_type_up.h:
 *                        contains the generic, simplified UP spinlock type.
 *                        (which is an empty structure on non-debug builds)
 *
 *  linux/spinlock_types.h:
 *                        defines the generic type and initializers
 *
 *  linux/spinlock_up.h:
 *                        contains the __raw_spin_*()/etc. version of UP
 *                        builds. (which are NOPs on non-debug, non-preempt
 *                        builds)
 *
 *   (included on UP-non-debug builds:)
 *
 *  linux/spinlock_api_up.h:
 *                        builds the _spin_*() APIs.
 *
 *  linux/spinlock.h:     builds the final spin_*() APIs.
 */

All SMP and UP architectures are converted by this patch.

arm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via
crosscompilers.  m32r, mips, sh, sparc, have not been tested yet, but should
be mostly fine.

From: Grant Grundler <grundler@parisc-linux.org>

  Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU).
  Builds 32-bit SMP kernel (not booted or tested).  I did not try to build
  non-SMP kernels.  That should be trivial to fix up later if necessary.

  I converted bit ops atomic_hash lock to raw_spinlock_t.  Doing so avoids
  some ugly nesting of linux/*.h and asm/*.h files.  Those particular locks
  are well tested and contained entirely inside arch specific code.  I do NOT
  expect any new issues to arise with them.

 If someone does ever need to use debug/metrics with them, then they will
  need to unravel this hairball between spinlocks, atomic ops, and bit ops
  that exist only because parisc has exactly one atomic instruction: LDCW
  (load and clear word).

From: "Luck, Tony" <tony.luck@intel.com>

   ia64 fix

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjanv@infradead.org>
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <willy@debian.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Mikael Pettersson <mikpe@csd.uu.se>
Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 10:06:21 -07:00
Linus Torvalds
486a153f0e Merge master.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild 2005-09-09 15:46:49 -07:00
Dipankar Sarma
b835996f62 [PATCH] files: lock-free fd look-up
With the use of RCU in files structure, the look-up of files using fds can now
be lock-free.  The lookup is protected by rcu_read_lock()/rcu_read_unlock().
This patch changes the readers to use lock-free lookup.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:57:55 -07:00
Dipankar Sarma
6e72ad2c58 [PATCH] files-sparc64-fix 2
Fix sparc64 timod to use the new files_fdtable() api to get the fd table.
This is necessary for RCUification.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:57:55 -07:00
Dipankar Sarma
badf16621c [PATCH] files: break up files struct
In order for the RCU to work, the file table array, sets and their sizes must
be updated atomically.  Instead of ensuring this through too many memory
barriers, we put the arrays and their sizes in a separate structure.  This
patch takes the first step of putting the file table elements in a separate
structure fdtable that is embedded withing files_struct.  It also changes all
the users to refer to the file table using files_fdtable() macro.  Subsequent
applciation of RCU becomes easier after this.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:57:55 -07:00
Sam Ravnborg
0037c78a96 kbuild: frv,m32r,sparc64 introduce fake asm-offsets.h file
Needed to get them to build.
And a hint to avoid hardcoding to many constants in assembler.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2005-09-09 22:47:53 +02:00
Linus Torvalds
7bbedd5213 Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6 2005-09-08 15:55:23 -07:00
David S. Miller
085ae41f66 [PATCH] Make sparc64 use setup-res.c
There were three changes necessary in order to allow
sparc64 to use setup-res.c:

1) Sparc64 roots the PCI I/O and MEM address space using
   parent resources contained in the PCI controller structure.
   I'm actually surprised no other platforms do this, especially
   ones like Alpha and PPC{,64}.  These resources get linked into the
   iomem/ioport tree when PCI controllers are probed.

   So the hierarchy looks like this:

   iomem --|
	   PCI controller 1 MEM space --|
				        device 1
					device 2
					etc.
	   PCI controller 2 MEM space --|
				        ...
   ioport --|
            PCI controller 1 IO space --|
					...
            PCI controller 2 IO space --|
					...

   You get the idea.  The drivers/pci/setup-res.c code allocates
   using plain iomem_space and ioport_space as the root, so that
   wouldn't work with the above setup.

   So I added a pcibios_select_root() that is used to handle this.
   It uses the PCI controller struct's io_space and mem_space on
   sparc64, and io{port,mem}_resource on every other platform to
   keep current behavior.

2) quirk_io_region() is buggy.  It takes in raw BUS view addresses
   and tries to use them as a PCI resource.

   pci_claim_resource() expects the resource to be fully formed when
   it gets called.  The sparc64 implementation would do the translation
   but that's absolutely wrong, because if the same resource gets
   released then re-claimed we'll adjust things twice.

   So I fixed up quirk_io_region() to do the proper pcibios_bus_to_resource()
   conversion before passing it on to pci_claim_resource().

3) I was mistakedly __init'ing the function methods the PCI controller
   drivers provide on sparc64 to implement some parts of these
   routines.  This was, of course, easy to fix.

So we end up with the following, and that nasty SPARC64 makefile
ifdef in drivers/pci/Makefile is finally zapped.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-08 14:57:25 -07:00
John W. Linville
064b53dbcc [PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it
Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration
(including BARs) when transitioning from D3hot->D0.  This leaves such
a device in an inaccessible state.  The patch below causes the BARs
to be restored when enabling such a device, so that its driver will
be able to access it.

The patch also adds pci_restore_bars as a new global symbol, and adds a
correpsonding EXPORT_SYMBOL_GPL for that.

Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a
(re)boot.  Most drivers call pci_enable_device very early, so devices
left in D3hot that lose configuration during the D3hot->D0 transition
will be inaccessible to their drivers.

Drivers could be modified to account for this, but it would
be difficult to know which drivers need modification.  This is
especially true since often many devices are covered by the same
driver.  It likely would be necessary to replicate code across dozens
of drivers.

The patch below should trigger only when transitioning from D3hot->D0
(or at boot), and only for devices that have the "no soft reset" bit
cleared in the PM control register.  I believe it is safe to include
this patch as part of the PCI infrastructure.

The cleanest implementation of pci_restore_bars was to call
pci_update_resource.  Unfortunately, that does not currently exist
for the sparc64 architecture.  The patch below includes a null
implemenation of pci_update_resource for sparc64.

Some have expressed interest in making general use of the the
pci_restore_bars function, so that has been exported to GPL licensed
modules.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-08 14:57:24 -07:00
David S. Miller
4d803fcdcd [SPARC64]: Inline membar()'s again.
Since GCC has to emit a call and a delay slot to the
out-of-line "membar" routines in arch/sparc64/lib/mb.S
it is much better to just do the necessary predicted
branch inline instead as:

	ba,pt	%xcc, 1f
	 membar	#whatever
1:

instead of the current:

	call	membar_foo
	 dslot

because this way GCC is not required to allocate a stack
frame if the function can be a leaf function.

This also makes this bug fix easier to backport to 2.4.x

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-08 14:37:53 -07:00
Linus Torvalds
946e91f36e Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2005-09-07 17:21:17 -07:00
viro@ZenIV.linux.org.uk
a08b6b7968 [PATCH] Kconfig fix (BLK_DEV_FD dependencies)
Sanitized and fixed floppy dependencies: split the messy dependencies for
BLK_DEV_FD by introducing a new symbol (ARCH_MAY_HAVE_PC_FDC), making
BLK_DEV_FD depend on that one and taking declarations of ARCH_MAY_HAVE_PC_FDC
to arch/*/Kconfig.  While we are at it, fixed several obvious cases when
BLK_DEV_FD should have been excluded (architectures lacking asm/floppy.h
are *not* going to have floppy.c compile, let alone work).

If you can come up with better name for that ("this architecture might
have working PC-compatible floppy disk controller"), you are more than
welcome - just s/ARCH_MAY_HAVE_PC_FDC/your_prefered_name/g in the patch
below...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 17:17:12 -07:00
Prasanna S Panchamukhi
83005161c8 [PATCH] kprobes-prevent-possible-race-conditions-sparc64-changes fix
This patch adds flags "ax" to .kprobe.text section.

Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:58:00 -07:00
Prasanna S Panchamukhi
05e14cb3ba [PATCH] Kprobes: prevent possible race conditions sparc64 changes
This patch contains the sparc64 architecture specific changes to prevent the
possible race conditions.

Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:58:00 -07:00
Miklos Szeredi
e922efc342 [PATCH] remove duplicated sys_open32() code from 64bit archs
64 bit architectures all implement their own compatibility sys_open(),
when in fact the difference is simply not forcing the O_LARGEFILE
flag.  So use the a common function instead.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:43 -07:00
john stultz
b149ee2233 [PATCH] NTP: ntp-helper functions
This patch cleans up a commonly repeated set of changes to the NTP state
variables by adding two helper inline functions:

ntp_clear(): Clears the ntp state variables

ntp_synced(): Returns 1 if the system is synced with a time server.

This was compile tested for alpha, arm, i386, x86-64, ppc64, s390, sparc,
sparc64.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:34 -07:00
David S. Miller
09bbe1043a [SPARC64]: Fix set/get MTU cases in sunos_ioctl()
Need to use compat struct sizes and compat_sys_ioctl().
Reported by Adrian Bunk via kernel bugzilla #2683

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-06 20:12:15 -07:00
David S. Miller
e5e259466f [SPARC64]: Don't include drivers/firmware/Kconfig
It's really not relevant for this platform in any
way, after all.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-05 23:34:13 -07:00
David S. Miller
a7a6cac204 [SPARC]: Kill io_remap_page_range()
It's been deprecated long enough and there are no in-tree
users any longer.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-01 21:51:26 -07:00
David S. Miller
8a36895c0d [SPARC64]: Use 'unsigned long' for port argument to I/O string ops.
This kills warnings when building drivers/ide/ide-iops.c
and puts us in-line with what other platforms do here.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-31 15:01:33 -07:00
David S. Miller
5843e37e24 [SPARC64]: Use drivers/Kconfig
And move some other stuff into drivers/sbus/char/Kconfig.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-30 21:46:19 -07:00
David S. Miller
2ef27778a2 [SPARC64]: Preserve nucleus ctx page size during TLB flushes.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-30 20:21:34 -07:00
David S. Miller
3c2cafaf50 [SPARC64]: Do not expand CHEETAH_LOG_ERROR 3 times.
We only need to expand this thing once, saving some
text section space.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-30 15:11:52 -07:00
David S. Miller
dbd2fdf549 [SPARC64]: Kill BRANCH_IF_ANY_CHEETAH() from copy page.
Just patch the branch at boot time instead.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-30 11:26:15 -07:00
David S. Miller
d7ce78fd9a [SPARC64]: Eliminate irq_cpustat_t.
We can put the __softirq_pending mask in the cpudata,
no need for the silly NR_CPUS array in kernel/softirq.c

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 22:46:43 -07:00
David S. Miller
4f07118f65 [SPARC64]: More fully work around Spitfire Errata 51.
It appears that a memory barrier soon after a mispredicted
branch, not just in the delay slot, can cause the hang
condition of this cpu errata.

So move them out-of-line, and explicitly put them into
a "branch always, predict taken" delay slot which should
fully kill this problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:46:22 -07:00
David S. Miller
442464a500 [SPARC64]: Make debugging spinlocks usable again.
When the spinlock routines were moved out of line into
kernel/spinlock.c this made it so that the debugging
spinlocks record lock acquisition program counts in the
kernel/spinlock.c functions not in their callers.
This makes the debugging info kind of useless.

So record the correct caller's program counter and
now this feature is useful once more.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:46:07 -07:00
Kumar Gala
3d6364abcf [SPARC64]: remove use of asm/segment.h
Removed sparc64 architecture specific users of asm/segment.h and
asm-sparc64/segment.h itself

Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:45:30 -07:00
David S. Miller
6c52a96e6c [SPARC64]: Revamp Spitfire error trap handling.
Current uncorrectable error handling was poor enough
that the processor could just loop taking the same
trap over and over again.  Fix things up so that we
at least get a log message and perhaps even some register
state.

In the process, much consolidation became possible,
particularly with the correctable error handler.

Prefix assembler and C function names with "spitfire"
to indicate that these are for Ultra-I/II/IIi/IIe only.

More work is needed to make these routines robust and
featureful to the level of the Ultra-III error handlers.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:45:11 -07:00
David S. Miller
bde4e4ee9f [SPARC64]: Do not call winfix_dax blindly
Verify we really are taking a data access exception trap, at TL1, from
one of the window spill/fill handlers.

Else call a new function, data_access_exception_tl1, to log the error.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:44:57 -07:00
David S. Miller
5ea68e0276 [SPARC64]: Fix trap state reading for instruction_access_exception.
1) Read ASI_IMMU SFSR not ASI_DMMU.
2) IMMU has no SFAR, read TPC instead
3) Delete old and incorrect comment about the DTLB protection
   trap having a dependency on the SFSR contents in order to
   function correctly

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 12:44:40 -07:00
Steven Rostedt
69be8f1896 [PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it.  I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.

The way NODEFER affects signals on other Unix boxes is as follows:

1) If NODEFER is set, other signals in sa_mask are still blocked.

2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).

The way NODEFER affects signals on Linux:

1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).

2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.

The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.

Unix boxes that were tested:  DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.

* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux.  So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 10:03:11 -07:00
Keith Owens
41290c1464 [PATCH] Export pcibios_bus_to_resource
pcibios_bus_to_resource is exported on all architectures except ia64
and sparc.  Add exports for the two missing architectures.  Needed when
Yenta socket support is compiled as a module.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-24 10:22:44 -07:00
David S. Miller
a3f9985843 [SPARC64]: Move kernel unaligned trap handlers into assembler file.
GCC 4.x really dislikes the games we are playing in
unaligned.c, and the cleanest way to fix this is to
move things into assembler.

Noted by Al Viro.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-19 15:55:33 -07:00
David S. Miller
2cab224d1f [SPARC64]: Fix 2 bugs in cpufreq drivers.
1) cpufreq wants frequenceis in KHZ not MHZ
2) provide ->get() method so curfreq node is created

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-18 14:35:38 -07:00
Andrew Morton
d64d387372 [NET]: Fix memory leak in sys_{send,recv}msg() w/compat
From: Dave Johnson <djohnson+linux-kernel@sw.starentnetworks.com>

sendmsg()/recvmsg() syscalls from o32/n32 apps to a 64bit kernel will
cause a kernel memory leak if iov_len > UIO_FASTIOV for each syscall!

This is because both sys_sendmsg() and verify_compat_iovec() kmalloc a
new iovec structure.  Only the one from sys_sendmsg() is free'ed.

I wrote a simple test program to confirm this after identifying the
problem:

http://davej.org/programs/testsendmsg.c

Note that the below fix will break solaris_sendmsg()/solaris_recvmsg() as
it also calls verify_compat_iovec() but expects it to malloc internally.

[ I fixed that. -DaveM ]

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-09 15:29:19 -07:00
Linus Torvalds
dc836b5b6f Revert "[PATCH] PCI: restore BAR values..."
Revert commit fec59a711e, which is
breaking sparc64 that doesn't have a working pci_update_resource.

We'll re-do this after 2.6.13 when we'll do it all properly.
2005-08-08 18:46:09 -07:00
John W. Linville
fec59a711e [PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it
Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration
(including BARs) when transitioning from D3hot->D0.  This leaves such
a device in an inaccessible state.  The patch below causes the BARs
to be restored when enabling such a device, so that its driver will
be able to access it.

The patch also adds pci_restore_bars as a new global symbol, and adds a
correpsonding EXPORT_SYMBOL_GPL for that.

Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a
(re)boot.  Most drivers call pci_enable_device very early, so devices
left in D3hot that lose configuration during the D3hot->D0 transition
will be inaccessible to their drivers.

Drivers could be modified to account for this, but it would
be difficult to know which drivers need modification.  This is
especially true since often many devices are covered by the same
driver.  It likely would be necessary to replicate code across dozens
of drivers.

The patch below should trigger only when transitioning from D3hot->D0
(or at boot), and only for devices that have the "no soft reset" bit
cleared in the PM control register.  I believe it is safe to include
this patch as part of the PCI infrastructure.

The cleanest implementation of pci_restore_bars was to call
pci_update_resource.  Unfortunately, that does not currently exist
for the sparc64 architecture.  The patch below includes a null
implemenation of pci_update_resource for sparc64.

Some have expressed interest in making general use of the the
pci_restore_bars function, so that has been exported to GPL licensed
modules.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-04 21:32:46 -07:00
David S. Miller
48b0e5487f [SPARC64]: Fix ugly dependency on NR_CPUS being a power-of-2.
The page->flags D-cache dirty state tracking depended upon
NR_CPUS being a power-of-2 via it's "NR_CPUS - 1" masking.

Fix that to use a fixed (256 - 1) mask as that is the limit
imposed by thread_info->cpu which is a "u8".

Finally, add a compile time check that NR_CPUS is not greater
than 256.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-27 16:08:44 -07:00
David S. Miller
40a085c41d [SPARC]: Add inotify syscall entries.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-27 14:14:39 -07:00
Eric W. Biederman
59586e5a26 [PATCH] Don't export machine_restart, machine_halt, or machine_power_off.
machine_restart, machine_halt and machine_power_off are machine
specific hooks deep into the reboot logic, that modules
have no business messing with.  Usually code should be calling
kernel_restart, kernel_halt, kernel_power_off, or
emergency_restart. So don't export machine_restart,
machine_halt, and machine_power_off so we can catch buggy users.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-26 14:35:42 -07:00
David S. Miller
db7d9a4eb7 [SPARC64]: Move syscall success and newchild state out of thread flags.
These two bits were accesses non-atomically from assembler
code.  So, in order to eliminate any potential races resulting
from that, move these pieces of state into two bytes elsewhere
in struct thread_info.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-24 19:36:26 -07:00
David S. Miller
cdd5186f75 [SPARC64]: Privatize sun5_timer.
It is only used by some localized code in irq.c, and also
delete enable_prom_timer() as that is totally unused.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-24 19:36:13 -07:00
Linus Torvalds
22a4427972 Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/i2c-2.6 2005-07-12 15:54:36 -07:00
Linus Torvalds
9f02d6b7b4 Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2005-07-12 13:17:42 -07:00
Andrew Morton
c12a828982 [SPARC64]: Fix SMP build failure.
arch/sparc64/kernel/smp.c:48: error: parse error before "__attribute__"
arch/sparc64/kernel/smp.c:49: error: parse error before "__attribute__"

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-12 12:09:43 -07:00
Sam Ravnborg
d5950b4355 [NET]: add a top-level Networking menu to *config
Create a new top-level menu named "Networking" thus moving
net related options and protocol selection way from the drivers
menu and up on the top-level where they belong.

To implement this all architectures has to source "net/Kconfig" before
drivers/*/Kconfig in their Kconfig file. This change has been
implemented for all architectures.

Device drivers for ordinary NIC's are still to be found
in the Device Drivers section, but Bluetooth, IrDA and ax25
are located with their corresponding menu entries under the new
networking menu item.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-11 21:03:49 -07:00
Jean Delvare
ad2f931dcb [PATCH] I2C: Move hwmon drivers (1/3)
Part 1: Configuration files and Makefiles.

From: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-07-11 14:14:31 -07:00
David S. Miller
f7ceba360c [SPARC64]: Add syscall auditing support.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 19:29:45 -07:00
David S. Miller
8d8a64796f [SPARC64]: Pass regs and entry/exit boolean to syscall_trace()
Also fix a bug in 32-bit syscall tracing.  We forgot to update
this code when we moved over to the convention that all 32-bit
syscall arguments are zero extended by default.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 16:55:48 -07:00
David S. Miller
bb49bcda15 [SPARC64]: Add SECCOMP support.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 16:49:28 -07:00
David S. Miller
af166d15c3 [SPARC64]: Kill ancient and unused SYSCALL_TRACING debugging code.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 15:56:40 -07:00
David S. Miller
d369ddd2fc [SPARC64]: Add __read_mostly support.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 15:45:11 -07:00
David S. Miller
9126dfde9e [SPARC]: Add ioprio system call support.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-10 15:11:45 -07:00
David S. Miller
a6524813e0 [SPARC64]: Support CONFIG_HZ
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-08 15:21:51 -07:00
David S. Miller
dcc83a0285 [SPARC64]: Typo in dtlb_backend.S, _PAGE_SZ4M --> _PAGE_SZ4MB
Noticed by Eddie C. Dost

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-08 13:33:10 -07:00
Eddie C. Dost
12cf649f41 [SPARC64]: Fix set_intr_affinity()
Do not cat bucket->irq_info to struct irqaction * directly,
but go through struct irq_desc *.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-06 15:40:21 -07:00
Linus Torvalds
fe0c9f5877 Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 2005-07-05 20:37:09 -07:00
David S. Miller
fef43da4e4 [SPARC64]: Fix UltraSPARC-III fallout from membar changes.
The membar changes made the size of __cheetah_flush_tlb_pending
grow by one instruction, but the boot-time code patching was
not updated to match.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-05 19:45:24 -07:00
Rusty Lynch
6772926bef [PATCH] kprobes: fix namespace problem and sparc64 build
The following renames arch_init, a kprobes function for performing any
architecture specific initialization, to arch_init_kprobes in order to
cleanup the namespace.

Also, this patch adds arch_init_kprobes to sparc64 to fix the sparc64 kprobes
build from the last return probe patch.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-05 19:19:00 -07:00
David S. Miller
864ae18007 [SPARC64]: Fix IRQ retry interval timer value on sparc64 PCI controllers.
Use '5' instead of 'infinity'.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-04 15:58:19 -07:00
David S. Miller
9fba62a59c [SPARC64]: Small Schizo PCI controller programming tweaks.
Use macro instead of magic value for Tomatillo discard-
timeout interrupt enable register bit.

Leave OBP programming PTO value unless Tomatillo and
version >= 0x2.

If no-bus-parking property is present, explicitly clear
PCICTRL_PARK bit.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-04 14:53:33 -07:00
David S. Miller
bb6743f4f0 [SPARC64]: Do proper DMA IRQ syncing on Tomatillo
This was the main impetus behind adding the PCI IRQ shim.

In order to properly order DMA writes wrt. interrupts, you have to
write to a PCI controller register, then poll for that bit clearing.
There is one bit for each interrupt source, and setting this register
bit tells Tomatillo to drain all pending DMA from that device.

Furthermore, Tomatillo's with revision less than 4 require us to do a
block store due to some memory transaction ordering issues it has on
JBUS.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-04 13:26:04 -07:00
David S. Miller
088dd1f81b [SPARC64]: Add support for IRQ pre-handlers.
This allows a PCI controller to shim into IRQ delivery
so that DMA queues can be drained, if necessary.

If some bus specific code needs to run before an IRQ
handler is invoked, the bus driver simply needs to setup
the function pointer in bucket->irq_info->pre_handler and
the two args bucket->irq_info->pre_handler_arg[12].

The Schizo PCI driver is converted over to use a pre-handler
for the DMA write-sync processing it needs when a device
is behind a PCI->PCI bus deeper than the top-level APB
bridges.

While we're here, clean up all of the action allocation
and handling.  Now, we allocate the irqaction as part of
the bucket->irq_info area.  There is an array of 4 irqaction
(for PCI irq sharing) and a bitmask saying which entries
are active.

The bucket->irq_info is allocated at build_irq() time, not
at request_irq() time.  This simplifies request_irq() and
free_irq() tremendously.

The SMP dynamic IRQ retargetting code got removed in this
change too.  It was disabled for a few months now, and we
can resurrect it in the future if we want.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-04 13:24:38 -07:00
Raphael Assenat
e7270dec08 [SPARC64/COMPAT]: Add some compat ioctl for ppdev
The following patch adds some ioctls to include/linux/compat_ioctl.h
to allow using ppdev from the 32 bit user space on sparc64.

This patch also adds the PPDEV option in the sparc64 menu, near Parallel
printer support in the 'General machine setup' submenu.

All those ioctls seem to be compatible, since (correct me if I'm wrong)
they dont use the 'long' type. See include/linux/ppdev.h.

The application I used to test the new ioctls only used the following:
PPEXCL
PPCLAIM
PPNEGOT
PPGETMODES
PPRCONTROL
PPWCONTROL
PPDATADIR
PPWDATA
PPRDATA

But I beleive that the other ioctls will work fine.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-04 13:23:45 -07:00
David S. Miller
63b614522c [SPARC64]: Get rid of fast IRQ feature.
The only real user was the assembler floppy interrupt
handler, which does not need to be in assembly.

This makes it so that there are less pieces of code which
know about the internal layout of ivector_table[] and
friends.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-27 17:04:45 -07:00
David S. Miller
b445e26cbf [SPARC64]: Avoid membar instructions in delay slots.
In particular, avoid membar instructions in the delay
slot of a jmpl instruction.

UltraSPARC-I, II, IIi, and IIe have a bug, documented in
the UltraSPARC-IIi User's Manual, Appendix K, Erratum 51

The long and short of it is that if the IMU unit misses
on a branch or jmpl, and there is a store buffer synchronizing
membar in the delay slot, the chip can stop fetching instructions.

If interrupts are enabled or some other trap is enabled, the
chip will unwedge itself, but performance will suffer.

We already had a workaround for this bug in a few spots, but
it's better to have the entire tree sanitized for this rule.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-27 15:42:04 -07:00
Stephen Rothwell
0d77e5a2c2 [PATCH] compat: introduce compat_time_t
This patch is based on work by Carlos O'Donell and Matthew Wilcox.  It
introduces/updates the compat_time_t type and uses it for compat siginfo
structures.  I have built this on ppc64 and x86_64.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:32 -07:00
Prasanna S Panchamukhi
e539c23314 [PATCH] kprobes: Temporary disarming of reentrant probe for sparc64
This patch includes sparc64 architecture specific changes to support temporary
disarming on reentrancy of probes.

Signed-of-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:25 -07:00
Rusty Lynch
7e1048b11c [PATCH] Move kprobe [dis]arming into arch specific code
The architecture independent code of the current kprobes implementation is
arming and disarming kprobes at registration time.  The problem is that the
code is assuming that arming and disarming is a just done by a simple write
of some magic value to an address.  This is problematic for ia64 where our
instructions look more like structures, and we can not insert break points
by just doing something like:

*p->addr = BREAKPOINT_INSTRUCTION;

The following patch to 2.6.12-rc4-mm2 adds two new architecture dependent
functions:

     * void arch_arm_kprobe(struct kprobe *p)
     * void arch_disarm_kprobe(struct kprobe *p)

and then adds the new functions for each of the architectures that already
implement kprobes (spar64/ppc64/i386/x86_64).

I thought arch_[dis]arm_kprobe was the most descriptive of what was really
happening, but each of the architectures already had a disarm_kprobe()
function that was really a "disarm and do some other clean-up items as
needed when you stumble across a recursive kprobe." So...  I took the
liberty of changing the code that was calling disarm_kprobe() to call
arch_disarm_kprobe(), and then do the cleanup in the block of code dealing
with the recursive kprobe case.

So far this patch as been tested on i386, x86_64, and ppc64, but still
needs to be tested in sparc64.

Signed-off-by: Rusty Lynch <rusty.lynch@intel.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:21 -07:00
Dave Hansen
3f22ab276b [PATCH] make each arch use mm/Kconfig
For all architectures, this just means that you'll see a "Memory Model"
choice in your architecture menu.  For those that implement DISCONTIGMEM,
you may eventually want to make your ARCH_DISCONTIGMEM_ENABLE a "def_bool
y" and make your users select DISCONTIGMEM right out of the new choice
menu.  The only disadvantage might be if you have some specific things that
you need in your help option to explain something about DISCONTIGMEM.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:02 -07:00
Wolfgang Wander
1363c3cd86 [PATCH] Avoiding mmap fragmentation
Ingo recently introduced a great speedup for allocating new mmaps using the
free_area_cache pointer which boosts the specweb SSL benchmark by 4-5% and
causes huge performance increases in thread creation.

The downside of this patch is that it does lead to fragmentation in the
mmap-ed areas (visible via /proc/self/maps), such that some applications
that work fine under 2.4 kernels quickly run out of memory on any 2.6
kernel.

The problem is twofold:

  1) the free_area_cache is used to continue a search for memory where
     the last search ended.  Before the change new areas were always
     searched from the base address on.

     So now new small areas are cluttering holes of all sizes
     throughout the whole mmap-able region whereas before small holes
     tended to close holes near the base leaving holes far from the base
     large and available for larger requests.

  2) the free_area_cache also is set to the location of the last
     munmap-ed area so in scenarios where we allocate e.g.  five regions of
     1K each, then free regions 4 2 3 in this order the next request for 1K
     will be placed in the position of the old region 3, whereas before we
     appended it to the still active region 1, placing it at the location
     of the old region 2.  Before we had 1 free region of 2K, now we only
     get two free regions of 1K -> fragmentation.

The patch addresses thes issues by introducing yet another cache descriptor
cached_hole_size that contains the largest known hole size below the
current free_area_cache.  If a new request comes in the size is compared
against the cached_hole_size and if the request can be filled with a hole
below free_area_cache the search is started from the base instead.

The results look promising: Whereas 2.6.12-rc4 fragments quickly and my
(earlier posted) leakme.c test program terminates after 50000+ iterations
with 96 distinct and fragmented maps in /proc/self/maps it performs nicely
(as expected) with thread creation, Ingo's test_str02 with 20000 threads
requires 0.7s system time.

Taking out Ingo's patch (un-patch available per request) by basically
deleting all mentions of free_area_cache from the kernel and starting the
search for new memory always at the respective bases we observe: leakme
terminates successfully with 11 distinctive hardly fragmented areas in
/proc/self/maps but thread creating is gringdingly slow: 30+s(!) system
time for Ingo's test_str02 with 20000 threads.

Now - drumroll ;-) the appended patch works fine with leakme: it ends with
only 7 distinct areas in /proc/self/maps and also thread creation seems
sufficiently fast with 0.71s for 20000 threads.

Signed-off-by: Wolfgang Wander <wwc@rentec.com>
Credit-to: "Richard Purdie" <rpurdie@rpsys.net>
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu> (partly)
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-21 18:46:16 -07:00
David Gibson
63551ae0fe [PATCH] Hugepage consolidation
A lot of the code in arch/*/mm/hugetlbpage.c is quite similar.  This patch
attempts to consolidate a lot of the code across the arch's, putting the
combined version in mm/hugetlb.c.  There are a couple of uglyish hacks in
order to covert all the hugepage archs, but the result is a very large
reduction in the total amount of code.  It also means things like hugepage
lazy allocation could be implemented in one place, instead of six.

Tested, at least a little, on ppc64, i386 and x86_64.

Notes:
	- this patch changes the meaning of set_huge_pte() to be more
	  analagous to set_pte()
	- does SH4 need s special huge_ptep_get_and_clear()??

Acked-by: William Lee Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-21 18:46:15 -07:00
Ingo Molnar
39c715b717 [PATCH] smp_processor_id() cleanup
This patch implements a number of smp_processor_id() cleanup ideas that
Arjan van de Ven and I came up with.

The previous __smp_processor_id/_smp_processor_id/smp_processor_id API
spaghetti was hard to follow both on the implementational and on the
usage side.

Some of the complexity arose from picking wrong names, some of the
complexity comes from the fact that not all architectures defined
__smp_processor_id.

In the new code, there are two externally visible symbols:

 - smp_processor_id(): debug variant.

 - raw_smp_processor_id(): nondebug variant. Replaces all existing
   uses of _smp_processor_id() and __smp_processor_id(). Defined
   by every SMP architecture in include/asm-*/smp.h.

There is one new internal symbol, dependent on DEBUG_PREEMPT:

 - debug_smp_processor_id(): internal debug variant, mapped to
                             smp_processor_id().

Also, i moved debug_smp_processor_id() from lib/kernel_lock.c into a new
lib/smp_processor_id.c file.  All related comments got updated and/or
clarified.

I have build/boot tested the following 8 .config combinations on x86:

 {SMP,UP} x {PREEMPT,!PREEMPT} x {DEBUG_PREEMPT,!DEBUG_PREEMPT}

I have also build/boot tested x64 on UP/PREEMPT/DEBUG_PREEMPT.  (Other
architectures are untested, but should work just fine.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-21 18:46:13 -07:00
David S. Miller
8005aba69a [SPARC64]: Fix cmsg length checks in Solaris emulation layer.
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-21 15:39:22 -07:00
David S. Miller
88314ee73f [SPARC64]: Refine PCI strbuf ctx-based flush.
The initial peek read PIO of the match register is just a waste.
Just do the flush writes first, as that is more efficient.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-31 19:13:52 -07:00
David S. Miller
7c963ad1d1 [SPARC64]: Fix streaming buffer flushing on PCI and SBUS.
Firstly, if the direction is TODEVICE, then dirty data in the
streaming cache is impossible so we can elide the flush-flag
synchronization in that case.

Next, the context allocator is broken.  It is highly likely
that contexts get used multiple times for different dma
mappings, which confuses the strbuf flushing code and makes
it run inefficiently.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-31 16:57:59 -07:00
David S. Miller
816242da37 [SPARC64]: Add boot option to force UltraSPARC-III P-Cache on.
Older UltraSPARC-III chips have a P-Cache bug that makes us disable it
by default at boot time.

However, this does hurt performance substantially, particularly with
memcpy(), and the bug is _incredibly_ obscure.  I have never seen it
triggered in practice, ever.

So provide a "-P" boot option that forces the P-Cache on.  It taints
the kernel, so if it does trigger and cause some data corruption or
OOPS, we will find out in the logs that this option was on when it
happened.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-23 15:52:08 -07:00
David S. Miller
a228dfd5dc [SPARC64]: Fix bad performance side effect of strbuf timeout changes.
The recent change to add a timeout to strbuf flushing had
a negative performance impact.  The udelay()'s are too long,
and they were done in the wrong order wrt. the register read
checks.  Fix both, and things are happy again.

There are more possible improvements in this area.  In fact,
PCI streaming buffer flushing seems to be part of the bottleneck
in network receive performance on my SunBlade1000 box.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-20 11:40:32 -07:00