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swiotlb: add the swiotlb initialization function with iotlb memory 

This enables the caller to initialize swiotlb with its own iotlb
memory.

See "swiotlb: swiotlb: add swiotlb_tbl_map_single library function" for
full description of patchset.

[v2: changed ..with_tlb to ..with_tbl]

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Albert Herranz <albert_herranz@yahoo.es>
This commit is contained in:
FUJITA Tomonori 2010-05-10 15:15:12 -04:00 committed by Konrad Rzeszutek Wilk
parent eb605a5754
commit abbceff7d7
2 changed files with 31 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/swiotlb.h
View File

@ -23,6 +23,7 @@ extern int swiotlb_force;
#define IO_TLB_SHIFT 11
extern void swiotlb_init(int verbose);
extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,

48
lib/swiotlb.c
View File

@ -140,28 +140,14 @@ void swiotlb_print_info(void)
(unsigned long long)pend);
}
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
void __init
swiotlb_init_with_default_size(size_t default_size, int verbose)
void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
unsigned long i, bytes;
if (!io_tlb_nslabs) {
io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
}
bytes = nslabs << IO_TLB_SHIFT;
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
/*
* Get IO TLB memory from the low pages
*/
io_tlb_start = alloc_bootmem_low_pages(bytes);
if (!io_tlb_start)
panic("Cannot allocate SWIOTLB buffer");
io_tlb_nslabs = nslabs;
io_tlb_start = tlb;
io_tlb_end = io_tlb_start + bytes;
/*
@ -185,6 +171,32 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
swiotlb_print_info();
}
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
void __init
swiotlb_init_with_default_size(size_t default_size, int verbose)
{
unsigned long bytes;
if (!io_tlb_nslabs) {
io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
}
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
/*
* Get IO TLB memory from the low pages
*/
io_tlb_start = alloc_bootmem_low_pages(bytes);
if (!io_tlb_start)
panic("Cannot allocate SWIOTLB buffer");
swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose);
}
void __init
swiotlb_init(int verbose)
{