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| author | Jason Gunthorpe <jgg@nvidia.com> | 2026-03-26 16:30:32 -0300 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-04-01 09:50:20 +0200 |
| commit | 1c18a1212c772b6a19e8583f2fca73f3a47b60fd (patch) | |
| tree | 2790e5f21559afa929cdba506568fb749f38a596 | |
| parent | a11661a58c06f7fdfef03a368ef20d05a4ea4ed0 (diff) | |
| download | lwn-1c18a1212c772b6a19e8583f2fca73f3a47b60fd.tar.gz lwn-1c18a1212c772b6a19e8583f2fca73f3a47b60fd.zip | |
iommu/dma: Always allow DMA-FQ when iommupt provides the iommu_domain
iommupt always supports the semantics required for DMA-FQ, when drivers
are converted to use it they automatically get support.
Detect iommpt directly instead of using IOMMU_CAP_DEFERRED_FLUSH and
remove IOMMU_CAP_DEFERRED_FLUSH from converted drivers.
This will also enable DMA-FQ on RISC-V.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| -rw-r--r-- | drivers/iommu/amd/iommu.c | 2 | ||||
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 13 | ||||
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 2 |
3 files changed, 12 insertions, 5 deletions
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index f1814fee5182..2e553e2051aa 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2978,8 +2978,6 @@ static bool amd_iommu_capable(struct device *dev, enum iommu_cap cap) return amdr_ivrs_remap_support; case IOMMU_CAP_ENFORCE_CACHE_COHERENCY: return true; - case IOMMU_CAP_DEFERRED_FLUSH: - return true; case IOMMU_CAP_DIRTY_TRACKING: { struct amd_iommu *iommu = get_amd_iommu_from_dev(dev); diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 5dac64be61bb..fbed93f8bf0a 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -14,6 +14,7 @@ #include <linux/device.h> #include <linux/dma-direct.h> #include <linux/dma-map-ops.h> +#include <linux/generic_pt/iommu.h> #include <linux/gfp.h> #include <linux/huge_mm.h> #include <linux/iommu.h> @@ -648,6 +649,15 @@ static void iommu_dma_init_options(struct iommu_dma_options *options, } } +static bool iommu_domain_supports_fq(struct device *dev, + struct iommu_domain *domain) +{ + /* iommupt always supports DMA-FQ */ + if (iommupt_from_domain(domain)) + return true; + return device_iommu_capable(dev, IOMMU_CAP_DEFERRED_FLUSH); +} + /** * iommu_dma_init_domain - Initialise a DMA mapping domain * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() @@ -706,7 +716,8 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, struct device *dev /* If the FQ fails we can simply fall back to strict mode */ if (domain->type == IOMMU_DOMAIN_DMA_FQ && - (!device_iommu_capable(dev, IOMMU_CAP_DEFERRED_FLUSH) || iommu_dma_init_fq(domain))) + (!iommu_domain_supports_fq(dev, domain) || + iommu_dma_init_fq(domain))) domain->type = IOMMU_DOMAIN_DMA; return iova_reserve_iommu_regions(dev, domain); diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 5dca8e525c73..80b183e207e5 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -3212,8 +3212,6 @@ static bool intel_iommu_capable(struct device *dev, enum iommu_cap cap) switch (cap) { case IOMMU_CAP_CACHE_COHERENCY: - case IOMMU_CAP_DEFERRED_FLUSH: - return true; case IOMMU_CAP_PRE_BOOT_PROTECTION: return dmar_platform_optin(); case IOMMU_CAP_ENFORCE_CACHE_COHERENCY: |