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intr-remap: allow disabling source id checking

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Allow disabling the source id checking while programming the interrupt
remap table entry. Useful for debugging or working around the broken
source id checks on some platforms.

Signed-off-by: Chris Wright <chrisw@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Chris Wright 2010-07-20 11:06:49 -07:00 committed by David Woodhouse
parent 9fe6206f40
commit d1423d5679
2 changed files with 27 additions and 0 deletions
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7
Documentation/kernel-parameters.txt
View file

@ -1028,6 +1028,12 @@ and is between 256 and 4096 characters. It is defined in the file
result in a hardware IOTLB flush operation as opposed
to batching them for performance.
intremap= [X86-64, Intel-IOMMU]
Format: { on (default) | off | nosid }
on enable Interrupt Remapping (default)
off disable Interrupt Remapping
nosid disable Source ID checking
inttest= [IA64]
iomem= Disable strict checking of access to MMIO memory
@ -1755,6 +1761,7 @@ and is between 256 and 4096 characters. It is defined in the file
nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
remapping.
[Deprecated - use intremap=off]
nointroute [IA-64]

20
drivers/pci/intr_remapping.c
View file

@ -21,6 +21,8 @@ static int ir_ioapic_num, ir_hpet_num;
int intr_remapping_enabled;
static int disable_intremap;
static int disable_sourceid_checking;
static __init int setup_nointremap(char *str)
{
disable_intremap = 1;
@ -28,6 +30,22 @@ static __init int setup_nointremap(char *str)
}
early_param("nointremap", setup_nointremap);
static __init int setup_intremap(char *str)
{
if (!str)
return -EINVAL;
if (!strncmp(str, "on", 2))
disable_intremap = 0;
else if (!strncmp(str, "off", 3))
disable_intremap = 1;
else if (!strncmp(str, "nosid", 5))
disable_sourceid_checking = 1;
return 0;
}
early_param("intremap", setup_intremap);
struct irq_2_iommu {
struct intel_iommu *iommu;
u16 irte_index;
@ -453,6 +471,8 @@ int free_irte(int irq)
static void set_irte_sid(struct irte *irte, unsigned int svt,
unsigned int sq, unsigned int sid)
{
if (disable_sourceid_checking)
svt = SVT_NO_VERIFY;
irte->svt = svt;
irte->sq = sq;
irte->sid = sid;