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calculate agaw for each iommu

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"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>
This commit is contained in:
Weidong Han 2008-12-08 15:34:06 +08:00 committed by Joerg Roedel
parent 8c11e798ee
commit 1b5736839a
4 changed files with 34 additions and 0 deletions
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10
drivers/pci/dmar.c
View File

@ -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));

22
drivers/pci/intel-iommu.c
View File

@ -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)
{

1
include/linux/dma_remapping.h
View File

@ -17,6 +17,7 @@ struct dmar_domain;
struct root_entry;
extern void free_dmar_iommu(struct intel_iommu *iommu);
extern int iommu_calculate_agaw(struct intel_iommu *iommu);
extern int dmar_disabled;

1
include/linux/intel-iommu.h
View File

@ -290,6 +290,7 @@ struct intel_iommu {
u32 gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
spinlock_t register_lock; /* protect register handling */
int seq_id; /* sequence id of the iommu */
int agaw; /* agaw of this iommu */
#ifdef CONFIG_DMAR
unsigned long *domain_ids; /* bitmap of domains */