From: Lu Baolu baolu.lu@linux.intel.com
[ Upstream commit 5518f239aff1baf772c5748da3add7243c5fb5df ]
Device ATS is currently enabled when a domain is attached to the device and disabled when the domain is detached. This creates a limitation: when the IOMMU is operating in scalable mode and IOPF is enabled, the device's domain cannot be changed.
The previous code enables ATS when a domain is set to a device's RID and disables it during RID domain switch. So, if a PASID is set with a domain requiring PRI, ATS should remain enabled until the domain is removed. During the PASID domain's lifecycle, if the RID's domain changes, PRI will be disrupted because it depends on ATS, which is disabled when the blocking domain is set for the device's RID.
Remove this limitation by moving ATS enablement to the device probe path.
Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Reviewed-by: Kevin Tian kevin.tian@intel.com Tested-by: Zhangfei Gao zhangfei.gao@linaro.org Link: https://lore.kernel.org/r/20250228092631.3425464-5-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/iommu.c | 51 ++++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 24 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 76417bd5e926e..d24dc72d066d9 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -1172,32 +1172,28 @@ static bool dev_needs_extra_dtlb_flush(struct pci_dev *pdev) return true; }
-static void iommu_enable_pci_caps(struct device_domain_info *info) +static void iommu_enable_pci_ats(struct device_domain_info *info) { struct pci_dev *pdev;
- if (!dev_is_pci(info->dev)) + if (!info->ats_supported) return;
pdev = to_pci_dev(info->dev); - if (info->ats_supported && pci_ats_page_aligned(pdev) && - !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) + if (!pci_ats_page_aligned(pdev)) + return; + + if (!pci_enable_ats(pdev, VTD_PAGE_SHIFT)) info->ats_enabled = 1; }
-static void iommu_disable_pci_caps(struct device_domain_info *info) +static void iommu_disable_pci_ats(struct device_domain_info *info) { - struct pci_dev *pdev; - - if (!dev_is_pci(info->dev)) + if (!info->ats_enabled) return;
- pdev = to_pci_dev(info->dev); - - if (info->ats_enabled) { - pci_disable_ats(pdev); - info->ats_enabled = 0; - } + pci_disable_ats(to_pci_dev(info->dev)); + info->ats_enabled = 0; }
static void intel_flush_iotlb_all(struct iommu_domain *domain) @@ -1556,12 +1552,19 @@ domain_context_mapping(struct dmar_domain *domain, struct device *dev) struct device_domain_info *info = dev_iommu_priv_get(dev); struct intel_iommu *iommu = info->iommu; u8 bus = info->bus, devfn = info->devfn; + int ret;
if (!dev_is_pci(dev)) return domain_context_mapping_one(domain, iommu, bus, devfn);
- return pci_for_each_dma_alias(to_pci_dev(dev), - domain_context_mapping_cb, domain); + ret = pci_for_each_dma_alias(to_pci_dev(dev), + domain_context_mapping_cb, domain); + if (ret) + return ret; + + iommu_enable_pci_ats(info); + + return 0; }
/* Return largest possible superpage level for a given mapping */ @@ -1843,8 +1846,6 @@ static int dmar_domain_attach_device(struct dmar_domain *domain, if (ret) goto out_block_translation;
- iommu_enable_pci_caps(info); - ret = cache_tag_assign_domain(domain, dev, IOMMU_NO_PASID); if (ret) goto out_block_translation; @@ -3210,6 +3211,7 @@ static void domain_context_clear(struct device_domain_info *info)
pci_for_each_dma_alias(to_pci_dev(info->dev), &domain_context_clear_one_cb, info); + iommu_disable_pci_ats(info); }
/* @@ -3226,7 +3228,6 @@ void device_block_translation(struct device *dev) if (info->domain) cache_tag_unassign_domain(info->domain, dev, IOMMU_NO_PASID);
- iommu_disable_pci_caps(info); if (!dev_is_real_dma_subdevice(dev)) { if (sm_supported(iommu)) intel_pasid_tear_down_entry(iommu, dev, @@ -3761,6 +3762,9 @@ static struct iommu_device *intel_iommu_probe_device(struct device *dev) !pci_enable_pasid(pdev, info->pasid_supported & ~1)) info->pasid_enabled = 1;
+ if (sm_supported(iommu)) + iommu_enable_pci_ats(info); + return &iommu->iommu; free_table: intel_pasid_free_table(dev); @@ -3777,6 +3781,8 @@ static void intel_iommu_release_device(struct device *dev) struct device_domain_info *info = dev_iommu_priv_get(dev); struct intel_iommu *iommu = info->iommu;
+ iommu_disable_pci_ats(info); + if (info->pasid_enabled) { pci_disable_pasid(to_pci_dev(dev)); info->pasid_enabled = 0; @@ -4415,13 +4421,10 @@ static int identity_domain_attach_dev(struct iommu_domain *domain, struct device if (dev_is_real_dma_subdevice(dev)) return 0;
- if (sm_supported(iommu)) { + if (sm_supported(iommu)) ret = intel_pasid_setup_pass_through(iommu, dev, IOMMU_NO_PASID); - if (!ret) - iommu_enable_pci_caps(info); - } else { + else ret = device_setup_pass_through(dev); - }
return ret; }