[Intel-gfx] [PATCH v4 5/7] iommu/vt-d: Update domain geometry in iommu_ops.at(de)tach_dev

Lu Baolu
2020-09-27T06:41:05Z

The iommu-dma constrains IOVA allocation based on the domain geometry
that the driver reports. Update domain geometry everytime a domain is
attached to or detached from a device.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel/iommu.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index fdd514c8b2d4..7d3c73d1e498 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -67,8 +67,8 @@
#define MAX_AGAW_WIDTH 64
#define MAX_AGAW_PFN_WIDTH (MAX_AGAW_WIDTH - VTD_PAGE_SHIFT)

-#define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
-#define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1)
+#define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << ((gaw) - VTD_PAGE_SHIFT)) - 1)
+#define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << (gaw)) - 1)

/* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR
to match. That way, we can use 'unsigned long' for PFNs with impunity. */
@@ -739,6 +739,18 @@ static void domain_update_iommu_cap(struct dmar_domain *domain)
*/
if (domain->nid == NUMA_NO_NODE)
domain->nid = domain_update_device_node(domain);
+
+ /*
+ * First-level translation restricts the input-address to a
+ * canonical address (i.e., address bits 63:N have the same
+ * value as address bit [N-1], where N is 48-bits with 4-level
+ * paging and 57-bits with 5-level paging). Hence, skip bit
+ * [N-1].
+ */
+ if (domain_use_first_level(domain))
+ domain->domain.geometry.aperture_end = __DOMAIN_MAX_ADDR(domain->gaw - 1);
+ else
+ domain->domain.geometry.aperture_end = __DOMAIN_MAX_ADDR(domain->gaw);
}

struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
--
2.17.1