Commit 02c6f31d authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Joerg Roedel
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iommu/amd: Globally detect SNP support 



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: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220713225651.20758-6-suravee.suthikulpanit@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ae180ba4

drivers/iommu/amd/init.c

+5 −2
Original line number Diff line number Diff line
@@ -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");

		}

	}