iommu/vt-d: Unify domain->iommu attach/detachment
Move the code to attach/detach domains to iommus and vice verce into a single function to make sure there are no dangling references. Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -1678,90 +1678,64 @@ static struct dmar_domain *alloc_domain(int flags)
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return domain;
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}
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static int __iommu_attach_domain(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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/* Must be called with iommu->lock */
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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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int num;
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unsigned long ndomains;
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num = domain->iommu_did[iommu->seq_id];
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if (num)
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return num;
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ndomains = cap_ndoms(iommu->cap);
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num = find_first_zero_bit(iommu->domain_ids, ndomains);
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if (num < ndomains) {
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set_bit(num, iommu->domain_ids);
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set_iommu_domain(iommu, num, domain);
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domain->iommu_did[iommu->seq_id] = num;
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} else {
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num = -ENOSPC;
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}
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if (num < 0)
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pr_err("%s: No free domain ids\n", iommu->name);
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return num;
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}
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static int iommu_attach_domain(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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{
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int num;
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unsigned long flags;
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int ret, num;
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spin_lock_irqsave(&iommu->lock, flags);
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num = __iommu_attach_domain(domain, iommu);
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spin_unlock_irqrestore(&iommu->lock, flags);
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return num;
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}
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static void iommu_detach_domain(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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{
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unsigned long flags;
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int num;
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spin_lock_irqsave(&iommu->lock, flags);
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num = domain->iommu_did[iommu->seq_id];
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if (num == 0)
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return;
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clear_bit(num, iommu->domain_ids);
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set_iommu_domain(iommu, num, NULL);
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spin_unlock_irqrestore(&iommu->lock, flags);
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}
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static void 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 flags;
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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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domain->nid = iommu->node;
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ndomains = cap_ndoms(iommu->cap);
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num = find_first_zero_bit(iommu->domain_ids, ndomains);
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if (num >= ndomains) {
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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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}
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set_bit(num, iommu->domain_ids);
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set_iommu_domain(iommu, num, domain);
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domain->iommu_did[iommu->seq_id] = num;
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domain->nid = iommu->node;
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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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}
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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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int count = INT_MAX;
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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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num = domain->iommu_did[iommu->seq_id];
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clear_bit(num, iommu->domain_ids);
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set_iommu_domain(iommu, num, NULL);
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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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@ -1886,7 +1860,6 @@ static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu,
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static void domain_exit(struct dmar_domain *domain)
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{
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struct page *freelist = NULL;
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int i;
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/* Domain 0 is reserved, so dont process it */
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if (!domain)
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@ -1896,20 +1869,16 @@ static void domain_exit(struct dmar_domain *domain)
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if (!intel_iommu_strict)
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flush_unmaps_timeout(0);
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/* remove associated devices */
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/* Remove associated devices and clear attached or cached domains */
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rcu_read_lock();
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domain_remove_dev_info(domain);
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rcu_read_unlock();
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/* destroy iovas */
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put_iova_domain(&domain->iovad);
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freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
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/* clear attached or cached domains */
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rcu_read_lock();
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for_each_domain_iommu(i, domain)
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iommu_detach_domain(domain, g_iommus[i]);
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rcu_read_unlock();
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dma_free_pagelist(freelist);
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free_domain_mem(domain);
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@ -2286,6 +2255,7 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
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struct dmar_domain *found = NULL;
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struct device_domain_info *info;
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unsigned long flags;
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int ret;
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info = alloc_devinfo_mem();
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if (!info)
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@ -2313,11 +2283,14 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
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return found;
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}
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if (iommu_attach_domain(domain, iommu) < 0) {
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spin_lock(&iommu->lock);
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ret = domain_attach_iommu(domain, iommu);
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spin_unlock(&iommu->lock);
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if (ret) {
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spin_unlock_irqrestore(&device_domain_lock, flags);
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return NULL;
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}
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domain_attach_iommu(domain, iommu);
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list_add(&info->link, &domain->devices);
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list_add(&info->global, &device_domain_list);
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@ -4590,12 +4563,10 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
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iommu_disable_dev_iotlb(info);
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domain_context_clear(iommu, dev);
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free_devinfo_mem(info);
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domain_detach_iommu(domain, iommu);
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spin_lock_irqsave(&domain->iommu_lock, flags);
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if (!domain->iommu_refcnt[iommu->seq_id])
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iommu_detach_domain(domain, iommu);
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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spin_lock_irqsave(&iommu->lock, flags);
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domain_detach_iommu(domain, iommu);
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spin_unlock_irqrestore(&iommu->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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@ -4676,10 +4647,12 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
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old_domain = find_domain(dev);
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if (old_domain) {
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rcu_read_lock();
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if (domain_type_is_vm_or_si(dmar_domain))
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dmar_remove_one_dev_info(old_domain, dev);
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else
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domain_remove_dev_info(old_domain);
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rcu_read_unlock();
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if (!domain_type_is_vm_or_si(old_domain) &&
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list_empty(&old_domain->devices))
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