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iommu/amd: Globally detect SNP support

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Modify existing SNP feature check to use the helper function
check_feature_on_all_iommus() to ensure consistency among all IOMMUs.
Also report IOMMU SNP support information for each IOMMU.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220713225651.20758-6-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suravee Suthikulpanit 2022-07-13 17:56:47 -05:00 committed by Joerg Roedel
parent ae180ba426
commit 02c6f31d0e
1 changed files with 5 additions and 2 deletions
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7
drivers/iommu/amd/init.c
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@ -389,7 +389,7 @@ static void iommu_set_cwwb_range(struct amd_iommu *iommu)
u64 start = iommu_virt_to_phys((void *)iommu->cmd_sem);
u64 entry = start & PM_ADDR_MASK;
if (!iommu_feature(iommu, FEATURE_SNP))
if (!check_feature_on_all_iommus(FEATURE_SNP))
return;
/* Note:
@ -804,7 +804,7 @@ static void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu,
void *buf = (void *)__get_free_pages(gfp, order);
if (buf &&
iommu_feature(iommu, FEATURE_SNP) &&
check_feature_on_all_iommus(FEATURE_SNP) &&
set_memory_4k((unsigned long)buf, (1 << order))) {
free_pages((unsigned long)buf, order);
buf = NULL;
@ -2143,6 +2143,9 @@ static void print_iommu_info(void)
if (iommu->features & FEATURE_GAM_VAPIC)
pr_cont(" GA_vAPIC");
if (iommu->features & FEATURE_SNP)
pr_cont(" SNP");
pr_cont("\n");
}
}