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iommu/amd: Indicate whether DMA remap support is enabled

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Bit 1 of the IVFS IVInfo field indicates that IOMMU has been used for
pre-boot DMA protection.

Export this capability to allow other places in the kernel to be able to
check for it on AMD systems.

Link: https://www.amd.com/system/files/TechDocs/48882_IOMMU.pdf
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/ce7627fa1c596878ca6515dd9d4381a45b6ee38c.1650878781.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Mario Limonciello 2022-04-25 13:42:05 +01:00 committed by Joerg Roedel
parent 86eaf4a5b4
commit f1ca70717b
3 changed files with 9 additions and 0 deletions
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4
drivers/iommu/amd/amd_iommu_types.h
View File

@ -407,6 +407,7 @@
/* IOMMU IVINFO */
#define IOMMU_IVINFO_OFFSET 36
#define IOMMU_IVINFO_EFRSUP BIT(0)
#define IOMMU_IVINFO_DMA_REMAP BIT(1)
/* IOMMU Feature Reporting Field (for IVHD type 10h */
#define IOMMU_FEAT_GASUP_SHIFT 6
@ -449,6 +450,9 @@ extern struct irq_remap_table **irq_lookup_table;
/* Interrupt remapping feature used? */
extern bool amd_iommu_irq_remap;
/* IVRS indicates that pre-boot remapping was enabled */
extern bool amdr_ivrs_remap_support;
/* kmem_cache to get tables with 128 byte alignement */
extern struct kmem_cache *amd_iommu_irq_cache;

3
drivers/iommu/amd/init.c
View File

@ -182,6 +182,7 @@ u32 amd_iommu_max_pasid __read_mostly = ~0;
bool amd_iommu_v2_present __read_mostly;
static bool amd_iommu_pc_present __read_mostly;
bool amdr_ivrs_remap_support __read_mostly;
bool amd_iommu_force_isolation __read_mostly;
@ -326,6 +327,8 @@ static void __init early_iommu_features_init(struct amd_iommu *iommu,
{
if (amd_iommu_ivinfo & IOMMU_IVINFO_EFRSUP)
iommu->features = h->efr_reg;
if (amd_iommu_ivinfo & IOMMU_IVINFO_DMA_REMAP)
amdr_ivrs_remap_support = true;
}
/* Access to l1 and l2 indexed register spaces */

2
drivers/iommu/amd/iommu.c
View File

@ -2155,6 +2155,8 @@ static bool amd_iommu_capable(enum iommu_cap cap)
return (irq_remapping_enabled == 1);
case IOMMU_CAP_NOEXEC:
return false;
case IOMMU_CAP_PRE_BOOT_PROTECTION:
return amdr_ivrs_remap_support;
default:
break;
}