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Commit d1423d56 authored by Chris Wright's avatar Chris Wright Committed by David Woodhouse
Browse files

intr-remap: allow disabling source id checking 



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: default avatarChris Wright <chrisw@redhat.com>
Acked-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Acked-by: default avatarWeidong Han <weidong.han@intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 9fe6206f

Documentation/kernel-parameters.txt

+7 −0
Original line number Diff line number Diff line
@@ -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]

drivers/pci/intr_remapping.c

+20 −0
Original line number Diff line number Diff line
@@ -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;