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authorWeidong Han <weidong.han@intel.com>2008-12-08 15:34:06 +0800
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:02:18 +0100
commit1b5736839ae13dadc5947940144f95dd0f4a4a8c (patch)
tree2b6ce6b68850d905e4ce5d38b6872b82f6328208 /drivers
parent8c11e798eee2ce4475134eaf61302b28ea4f205d (diff)
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calculate agaw for each iommu
"SAGAW" capability may be different across iommus. Use a default agaw, but if default agaw is not supported in some iommus, choose a less supported agaw. Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/dmar.c10
-rw-r--r--drivers/pci/intel-iommu.c22
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 5f164ff3026e..f5a662a50acb 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -491,6 +491,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
int map_size;
u32 ver;
static int iommu_allocated = 0;
+ int agaw;
iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
if (!iommu)
@@ -506,6 +507,15 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
+ agaw = iommu_calculate_agaw(iommu);
+ if (agaw < 0) {
+ printk(KERN_ERR
+ "Cannot get a valid agaw for iommu (seq_id = %d)\n",
+ iommu->seq_id);
+ goto error;
+ }
+ iommu->agaw = agaw;
+
/* the registers might be more than one page */
map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
cap_max_fault_reg_offset(iommu->cap));
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 9dca689215eb..3ecfa2304c2c 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -362,6 +362,28 @@ void free_iova_mem(struct iova *iova)
kmem_cache_free(iommu_iova_cache, iova);
}
+
+static inline int width_to_agaw(int width);
+
+/* calculate agaw for each iommu.
+ * "SAGAW" may be different across iommus, use a default agaw, and
+ * get a supported less agaw for iommus that don't support the default agaw.
+ */
+int iommu_calculate_agaw(struct intel_iommu *iommu)
+{
+ unsigned long sagaw;
+ int agaw = -1;
+
+ sagaw = cap_sagaw(iommu->cap);
+ for (agaw = width_to_agaw(DEFAULT_DOMAIN_ADDRESS_WIDTH);
+ agaw >= 0; agaw--) {
+ if (test_bit(agaw, &sagaw))
+ break;
+ }
+
+ return agaw;
+}
+
/* in native case, each domain is related to only one iommu */
static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
{