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PCI / PCIe: Introduce command line option to disable ARI

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There are PCIe devices on the market that report ARI support but
then fail to initialize correctly when ARI is actually used.  This
leads to situations in which kernels 2.6.34 and newer fail to handle
systems where the previous kernels worked without any apparent
problems.  Unfortunately, it is currently unknown how many such
devices are there.

For this reason, introduce a new kernel command line option,
pci=noari, allowing users to disable PCIe ARI altogether if they
see problems with PCIe device initialization.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki 2012-03-01 00:06:33 +01:00 committed by Jesse Barnes
parent f6330c3178
commit 6748dcc269
2 changed files with 7 additions and 1 deletions
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1
Documentation/kernel-parameters.txt
View file

@ -2116,6 +2116,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
off: Turn realloc off
on: Turn realloc on
realloc same as realloc=on
noari do not use PCIe ARI.
pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
Management.

7
drivers/pci/pci.c
View file

@ -94,6 +94,9 @@ u8 pci_cache_line_size;
*/
unsigned int pcibios_max_latency = 255;
/* If set, the PCIe ARI capability will not be used. */
static bool pcie_ari_disabled;
/**
* pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
* @bus: pointer to PCI bus structure to search
@ -1955,7 +1958,7 @@ void pci_enable_ari(struct pci_dev *dev)
u16 flags, ctrl;
struct pci_dev *bridge;
if (!pci_is_pcie(dev) || dev->devfn)
if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn)
return;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
@ -3840,6 +3843,8 @@ static int __init pci_setup(char *str)
pci_realloc_get_opt("on");
} else if (!strcmp(str, "nodomains")) {
pci_no_domains();
} else if (!strncmp(str, "noari", 5)) {
pcie_ari_disabled = true;
} else if (!strncmp(str, "cbiosize=", 9)) {
pci_cardbus_io_size = memparse(str + 9, &str);
} else if (!strncmp(str, "cbmemsize=", 10)) {