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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/pci/dmar.c
parent8c11e798eee2ce4475134eaf61302b28ea4f205d (diff)
downloadop-kernel-dev-1b5736839ae13dadc5947940144f95dd0f4a4a8c.zip
op-kernel-dev-1b5736839ae13dadc5947940144f95dd0f4a4a8c.tar.gz
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/pci/dmar.c')
-rw-r--r--drivers/pci/dmar.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 5f164ff..f5a662a 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));
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