diff options
author | Lu Baolu <baolu.lu@linux.intel.com> | 2022-11-22 03:29:44 +0300 |
---|---|---|
committer | Joerg Roedel <jroedel@suse.de> | 2022-11-22 16:05:20 +0300 |
commit | c7be17c2903d4acbf9aa372bfb6e2a418387fce0 (patch) | |
tree | 53a0d155e19467c33b4b1635c3d74c259dd55f42 /drivers/iommu | |
parent | ec62b4424174f41bdcedd08d12d7bed80088453d (diff) | |
download | linux-c7be17c2903d4acbf9aa372bfb6e2a418387fce0.tar.xz |
iommu/vt-d: Add device_block_translation() helper
If domain attaching to device fails, the IOMMU driver should bring the
device to blocking DMA state. The upper layer is expected to recover it
by attaching a new domain. Use device_block_translation() in the error
path of dev_attach to make the behavior specific.
The difference between device_block_translation() and the previous
dmar_remove_one_dev_info() is that, in the scalable mode, it is the
RID2PASID entry instead of context entry being cleared. As a result,
enabling PCI capabilities is moved up.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20221118132451.114406-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/intel/iommu.c | 44 |
1 files changed, 38 insertions, 6 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 6b8a24f68da8..6aafb86ef5c3 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -277,7 +277,7 @@ static LIST_HEAD(dmar_satc_units); #define for_each_rmrr_units(rmrr) \ list_for_each_entry(rmrr, &dmar_rmrr_units, list) -static void dmar_remove_one_dev_info(struct device *dev); +static void device_block_translation(struct device *dev); int dmar_disabled = !IS_ENABLED(CONFIG_INTEL_IOMMU_DEFAULT_ON); int intel_iommu_sm = IS_ENABLED(CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON); @@ -1400,7 +1400,7 @@ static void iommu_enable_pci_caps(struct device_domain_info *info) { struct pci_dev *pdev; - if (!info || !dev_is_pci(info->dev)) + if (!dev_is_pci(info->dev)) return; pdev = to_pci_dev(info->dev); @@ -2045,7 +2045,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain, } else { iommu_flush_write_buffer(iommu); } - iommu_enable_pci_caps(info); ret = 0; @@ -2487,7 +2486,7 @@ static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) dev, PASID_RID2PASID); if (ret) { dev_err(dev, "Setup RID2PASID failed\n"); - dmar_remove_one_dev_info(dev); + device_block_translation(dev); return ret; } } @@ -2495,10 +2494,12 @@ static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) ret = domain_context_mapping(domain, dev); if (ret) { dev_err(dev, "Domain context map failed\n"); - dmar_remove_one_dev_info(dev); + device_block_translation(dev); return ret; } + iommu_enable_pci_caps(info); + return 0; } @@ -4109,6 +4110,37 @@ static void dmar_remove_one_dev_info(struct device *dev) info->domain = NULL; } +/* + * Clear the page table pointer in context or pasid table entries so that + * all DMA requests without PASID from the device are blocked. If the page + * table has been set, clean up the data structures. + */ +static void device_block_translation(struct device *dev) +{ + struct device_domain_info *info = dev_iommu_priv_get(dev); + struct intel_iommu *iommu = info->iommu; + unsigned long flags; + + iommu_disable_dev_iotlb(info); + if (!dev_is_real_dma_subdevice(dev)) { + if (sm_supported(iommu)) + intel_pasid_tear_down_entry(iommu, dev, + PASID_RID2PASID, false); + else + domain_context_clear(info); + } + + if (!info->domain) + return; + + spin_lock_irqsave(&info->domain->lock, flags); + list_del(&info->link); + spin_unlock_irqrestore(&info->domain->lock, flags); + + domain_detach_iommu(info->domain, iommu); + info->domain = NULL; +} + static int md_domain_init(struct dmar_domain *domain, int guest_width) { int adjust_width; @@ -4232,7 +4264,7 @@ static int intel_iommu_attach_device(struct iommu_domain *domain, struct device_domain_info *info = dev_iommu_priv_get(dev); if (info->domain) - dmar_remove_one_dev_info(dev); + device_block_translation(dev); } ret = prepare_domain_attach_device(domain, dev); |