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iommu: Add IOMMU_CAP_ENFORCE_CACHE_COHERENCY 

This queries if a domain linked to a device should expect to support
enforce_cache_coherency() so iommufd can negotiate the rules for when a
domain should be shared or not.

For iommufd a device that declares IOMMU_CAP_ENFORCE_CACHE_COHERENCY will
not be attached to a domain that does not support it.

Link: https://lore.kernel.org/r/1-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yu He <yu.he@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2022-11-29 16:29:24 -04:00
parent 69e61edebe
commit 4989764d8e
3 changed files with 20 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -2278,6 +2278,8 @@ static bool amd_iommu_capable(struct device *dev, enum iommu_cap cap)
return false;
case IOMMU_CAP_PRE_BOOT_PROTECTION:
return amdr_ivrs_remap_support;
case IOMMU_CAP_ENFORCE_CACHE_COHERENCY:
return true;
default:
break;
}

20
drivers/iommu/intel/iommu.c
View File

@ -4450,14 +4450,20 @@ static bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain)
static bool intel_iommu_capable(struct device *dev, enum iommu_cap cap)
{
if (cap == IOMMU_CAP_CACHE_COHERENCY)
return true;
if (cap == IOMMU_CAP_INTR_REMAP)
return irq_remapping_enabled == 1;
if (cap == IOMMU_CAP_PRE_BOOT_PROTECTION)
return dmar_platform_optin();
struct device_domain_info *info = dev_iommu_priv_get(dev);
return false;
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY:
return true;
case IOMMU_CAP_INTR_REMAP:
return irq_remapping_enabled == 1;
case IOMMU_CAP_PRE_BOOT_PROTECTION:
return dmar_platform_optin();
case IOMMU_CAP_ENFORCE_CACHE_COHERENCY:
return ecap_sc_support(info->iommu->ecap);
default:
return false;
}
}
static struct iommu_device *intel_iommu_probe_device(struct device *dev)

5
include/linux/iommu.h
View File

@ -124,6 +124,11 @@ enum iommu_cap {
IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
DMA protection and we should too */
/*
* Per-device flag indicating if enforce_cache_coherency() will work on
* this device.
*/
IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
};
/* These are the possible reserved region types */