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| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-11-20 13:57:32 (GMT) |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-11-27 10:45:50 (GMT) |
| commit | c459611424d8b8396060eb766e23bd0c70c993bc (patch) | |
| tree | 2c15dda4d4eda490b8593aba5f29b3e1df7d2878 /arch/x86/kernel/amd_iommu.c | |
| parent | bb52777ec4d736c2d7c4f037b32d4eeeb172ed89 (diff) | |
| download | linux-fsl-qoriq-c459611424d8b8396060eb766e23bd0c70c993bc.tar.xz | |
x86/amd-iommu: Add per IOMMU reference counting
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>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 7fe28be..8c38f00 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -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); |