forked from Minki/linux
iommu/vt-d: Get rid of domain->iommu_lock
When this lock is held the device_domain_lock is also required to make sure the device_domain_info does not vanish while in use. So this lock can be removed as it gives no additional protection. Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel
parent
de7e888646
commit
55d940430a
@ -406,7 +406,6 @@ struct dmar_domain {
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int iommu_superpage;/* Level of superpages supported:
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0 == 4KiB (no superpages), 1 == 2MiB,
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2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
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spinlock_t iommu_lock; /* protect iommu set in domain */
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u64 max_addr; /* maximum mapped address */
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struct iommu_domain domain; /* generic domain data structure for
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@ -476,6 +475,8 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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struct device *dev);
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static void domain_context_clear(struct intel_iommu *iommu,
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struct device *dev);
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static void __dmar_remove_one_dev_info(struct dmar_domain *domain,
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struct device *dev);
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static int domain_detach_iommu(struct dmar_domain *domain,
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struct intel_iommu *iommu);
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@ -1404,24 +1405,23 @@ iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu,
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u8 bus, u8 devfn)
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{
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bool found = false;
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unsigned long flags;
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struct device_domain_info *info;
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struct pci_dev *pdev;
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assert_spin_locked(&device_domain_lock);
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if (!ecap_dev_iotlb_support(iommu->ecap))
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return NULL;
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if (!iommu->qi)
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return NULL;
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spin_lock_irqsave(&device_domain_lock, flags);
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list_for_each_entry(info, &domain->devices, link)
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if (info->iommu == iommu && info->bus == bus &&
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info->devfn == devfn) {
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found = true;
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break;
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}
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spin_unlock_irqrestore(&device_domain_lock, flags);
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if (!found || !info->dev || !dev_is_pci(info->dev))
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return NULL;
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@ -1616,10 +1616,12 @@ static int iommu_init_domains(struct intel_iommu *iommu)
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static void disable_dmar_iommu(struct intel_iommu *iommu)
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{
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struct device_domain_info *info, *tmp;
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unsigned long flags;
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if (!iommu->domains || !iommu->domain_ids)
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return;
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spin_lock_irqsave(&device_domain_lock, flags);
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list_for_each_entry_safe(info, tmp, &device_domain_list, global) {
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struct dmar_domain *domain;
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@ -1636,6 +1638,7 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
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if (!domain_type_is_vm_or_si(domain))
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domain_exit(domain);
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}
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spin_unlock_irqrestore(&device_domain_lock, flags);
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if (iommu->gcmd & DMA_GCMD_TE)
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iommu_disable_translation(iommu);
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@ -1672,7 +1675,6 @@ static struct dmar_domain *alloc_domain(int flags)
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memset(domain, 0, sizeof(*domain));
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domain->nid = -1;
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domain->flags = flags;
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spin_lock_init(&domain->iommu_lock);
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INIT_LIST_HEAD(&domain->devices);
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return domain;
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@ -1683,13 +1685,11 @@ static int domain_attach_iommu(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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{
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unsigned long ndomains;
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unsigned long flags;
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int ret, num;
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int num;
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assert_spin_locked(&device_domain_lock);
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assert_spin_locked(&iommu->lock);
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spin_lock_irqsave(&domain->iommu_lock, flags);
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domain->iommu_refcnt[iommu->seq_id] += 1;
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domain->iommu_count += 1;
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if (domain->iommu_refcnt[iommu->seq_id] == 1) {
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@ -1700,8 +1700,7 @@ static int domain_attach_iommu(struct dmar_domain *domain,
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pr_err("%s: No free domain ids\n", iommu->name);
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domain->iommu_refcnt[iommu->seq_id] -= 1;
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domain->iommu_count -= 1;
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ret = -ENOSPC;
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goto out_unlock;
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return -ENOSPC;
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}
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set_bit(num, iommu->domain_ids);
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@ -1713,22 +1712,17 @@ static int domain_attach_iommu(struct dmar_domain *domain,
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domain_update_iommu_cap(domain);
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}
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ret = 0;
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out_unlock:
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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return ret;
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return 0;
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}
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static int domain_detach_iommu(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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{
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int num, count = INT_MAX;
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unsigned long flags;
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assert_spin_locked(&device_domain_lock);
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assert_spin_locked(&iommu->lock);
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spin_lock_irqsave(&domain->iommu_lock, flags);
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domain->iommu_refcnt[iommu->seq_id] -= 1;
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count = --domain->iommu_count;
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if (domain->iommu_refcnt[iommu->seq_id] == 0) {
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@ -1739,7 +1733,6 @@ static int domain_detach_iommu(struct dmar_domain *domain,
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domain_update_iommu_cap(domain);
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domain->iommu_did[iommu->seq_id] = 0;
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}
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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return count;
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}
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@ -1894,7 +1887,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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struct context_entry *context;
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unsigned long flags;
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struct dma_pte *pgd;
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int agaw;
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int ret, agaw;
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WARN_ON(did == 0);
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@ -1906,16 +1899,17 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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BUG_ON(!domain->pgd);
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spin_lock_irqsave(&iommu->lock, flags);
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spin_lock_irqsave(&device_domain_lock, flags);
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spin_lock(&iommu->lock);
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ret = -ENOMEM;
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context = iommu_context_addr(iommu, bus, devfn, 1);
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spin_unlock_irqrestore(&iommu->lock, flags);
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if (!context)
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return -ENOMEM;
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spin_lock_irqsave(&iommu->lock, flags);
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if (context_present(context)) {
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spin_unlock_irqrestore(&iommu->lock, flags);
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return 0;
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}
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goto out_unlock;
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ret = 0;
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if (context_present(context))
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goto out_unlock;
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pgd = domain->pgd;
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@ -1928,11 +1922,10 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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*/
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if (translation != CONTEXT_TT_PASS_THROUGH) {
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for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
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ret = -ENOMEM;
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pgd = phys_to_virt(dma_pte_addr(pgd));
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if (!dma_pte_present(pgd)) {
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spin_unlock_irqrestore(&iommu->lock, flags);
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return -ENOMEM;
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}
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if (!dma_pte_present(pgd))
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goto out_unlock;
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}
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info = iommu_support_dev_iotlb(domain, iommu, bus, devfn);
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@ -1971,7 +1964,12 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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iommu_flush_write_buffer(iommu);
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}
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iommu_enable_dev_iotlb(info);
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spin_unlock_irqrestore(&iommu->lock, flags);
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ret = 0;
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out_unlock:
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spin_unlock(&iommu->lock);
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spin_unlock_irqrestore(&device_domain_lock, flags);
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return 0;
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}
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@ -2214,9 +2212,12 @@ static inline void unlink_domain_info(struct device_domain_info *info)
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static void domain_remove_dev_info(struct dmar_domain *domain)
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{
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struct device_domain_info *info, *tmp;
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unsigned long flags;
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spin_lock_irqsave(&device_domain_lock, flags);
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list_for_each_entry_safe(info, tmp, &domain->devices, link)
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dmar_remove_one_dev_info(domain, info->dev);
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__dmar_remove_one_dev_info(domain, info->dev);
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spin_unlock_irqrestore(&device_domain_lock, flags);
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}
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/*
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@ -4539,14 +4540,16 @@ static void domain_context_clear(struct intel_iommu *iommu, struct device *dev)
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pci_for_each_dma_alias(to_pci_dev(dev), &domain_context_clear_one_cb, iommu);
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}
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static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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struct device *dev)
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static void __dmar_remove_one_dev_info(struct dmar_domain *domain,
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struct device *dev)
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{
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struct device_domain_info *info;
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struct intel_iommu *iommu;
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unsigned long flags;
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u8 bus, devfn;
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assert_spin_locked(&device_domain_lock);
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iommu = device_to_iommu(dev, &bus, &devfn);
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if (!iommu)
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return;
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@ -4556,9 +4559,7 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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if (WARN_ON(!info))
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return;
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spin_lock_irqsave(&device_domain_lock, flags);
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unlink_domain_info(info);
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spin_unlock_irqrestore(&device_domain_lock, flags);
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iommu_disable_dev_iotlb(info);
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domain_context_clear(iommu, dev);
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@ -4569,6 +4570,16 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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spin_unlock_irqrestore(&iommu->lock, flags);
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}
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static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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struct device *dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&device_domain_lock, flags);
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__dmar_remove_one_dev_info(domain, dev);
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spin_unlock_irqrestore(&device_domain_lock, flags);
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}
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static int md_domain_init(struct dmar_domain *domain, int guest_width)
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{
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int adjust_width;
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