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>
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@ -238,7 +238,9 @@ struct protection_domain {
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unsigned long flags; /* flags to find out type of domain */
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unsigned long flags; /* flags to find out type of domain */
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bool updated; /* complete domain flush required */
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bool updated; /* complete domain flush required */
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unsigned dev_cnt; /* devices assigned to this domain */
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unsigned dev_cnt; /* devices assigned to this domain */
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unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
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void *priv; /* private data */
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void *priv; /* private data */
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};
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};
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/*
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/*
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@ -1175,7 +1175,9 @@ static void __attach_device(struct amd_iommu *iommu,
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/* update DTE entry */
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/* update DTE entry */
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set_dte_entry(devid, domain);
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set_dte_entry(devid, domain);
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domain->dev_cnt += 1;
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/* Do reference counting */
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domain->dev_iommu[iommu->index] += 1;
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domain->dev_cnt += 1;
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/* ready */
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/* ready */
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spin_unlock(&domain->lock);
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spin_unlock(&domain->lock);
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@ -1209,6 +1211,9 @@ static void attach_device(struct amd_iommu *iommu,
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*/
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*/
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static void __detach_device(struct protection_domain *domain, u16 devid)
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static void __detach_device(struct protection_domain *domain, u16 devid)
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{
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{
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struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
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BUG_ON(!iommu);
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/* lock domain */
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/* lock domain */
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spin_lock(&domain->lock);
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spin_lock(&domain->lock);
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@ -1223,8 +1228,9 @@ static void __detach_device(struct protection_domain *domain, u16 devid)
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amd_iommu_apply_erratum_63(devid);
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amd_iommu_apply_erratum_63(devid);
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/* decrease reference counter */
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/* decrease reference counters */
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domain->dev_cnt -= 1;
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domain->dev_iommu[iommu->index] -= 1;
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domain->dev_cnt -= 1;
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/* ready */
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/* ready */
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spin_unlock(&domain->lock);
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spin_unlock(&domain->lock);
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