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x86/amd-iommu: Add per IOMMU reference counting

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This patch adds reference counting for protection domains
per IOMMU. This allows a smarter TLB flushing strategy.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2009-11-20 14:57:32 +01:00
parent bb52777ec4
commit c459611424
2 changed files with 11 additions and 3 deletions
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12
arch/x86/kernel/amd_iommu.c
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@@ -1175,7 +1175,9 @@ static void __attach_device(struct amd_iommu *iommu,
/* update DTE entry */
set_dte_entry(devid, domain);
domain->dev_cnt += 1;
/* Do reference counting */
domain->dev_iommu[iommu->index] += 1;
domain->dev_cnt += 1;
/* ready */
spin_unlock(&domain->lock);
@@ -1209,6 +1211,9 @@ static void attach_device(struct amd_iommu *iommu,
*/
static void __detach_device(struct protection_domain *domain, u16 devid)
{
struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
BUG_ON(!iommu);
/* lock domain */
spin_lock(&domain->lock);
@@ -1223,8 +1228,9 @@ static void __detach_device(struct protection_domain *domain, u16 devid)
amd_iommu_apply_erratum_63(devid);
/* decrease reference counter */
domain->dev_cnt -= 1;
/* decrease reference counters */
domain->dev_iommu[iommu->index] -= 1;
domain->dev_cnt -= 1;
/* ready */
spin_unlock(&domain->lock);