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iommu/amd: Add blocked domain support

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Create global blocked domain with attach device ops. It will clear the
DTE so that all DMA from device will be aborted.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240722115452.5976-1-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde
2024-07-22 11:54:52 +00:00
committed by Joerg Roedel
parent 7c626ce4ba
commit e5e5cc8f73
1 changed files with 24 additions and 0 deletions
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drivers/iommu/amd/iommu.c
+24
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@@ -2462,6 +2462,29 @@ void amd_iommu_domain_free(struct iommu_domain *dom)
protection_domain_free(domain);
}
static int blocked_domain_attach_device(struct iommu_domain *domain,
struct device *dev)
{
struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
if (dev_data->domain)
detach_device(dev);
/* Clear DTE and flush the entry */
spin_lock(&dev_data->lock);
amd_iommu_dev_update_dte(dev_data, false);
spin_unlock(&dev_data->lock);
return 0;
}
static struct iommu_domain blocked_domain = {
.type = IOMMU_DOMAIN_BLOCKED,
.ops = &(const struct iommu_domain_ops) {
.attach_dev = blocked_domain_attach_device,
}
};
static int amd_iommu_attach_device(struct iommu_domain *dom,
struct device *dev)
{
@@ -2859,6 +2882,7 @@ static int amd_iommu_dev_disable_feature(struct device *dev,
const struct iommu_ops amd_iommu_ops = {
.capable = amd_iommu_capable,
.blocked_domain = &blocked_domain,
.domain_alloc = amd_iommu_domain_alloc,
.domain_alloc_user = amd_iommu_domain_alloc_user,
.domain_alloc_sva = amd_iommu_domain_alloc_sva,