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x86/amd-iommu: Keep devices per domain in a list
This patch introduces a list to each protection domain which keeps all devices associated with the domain. This can be used later to optimize certain functions and to completly remove the amd_iommu_pd_table. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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241000556f
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2 changed files with 13 additions and 0 deletions
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@ -235,6 +235,7 @@ extern bool amd_iommu_np_cache;
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*/
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struct protection_domain {
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struct list_head list; /* for list of all protection domains */
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struct list_head dev_list; /* List of all devices in this domain */
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spinlock_t lock; /* mostly used to lock the page table*/
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u16 id; /* the domain id written to the device table */
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int mode; /* paging mode (0-6 levels) */
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@ -251,6 +252,7 @@ struct protection_domain {
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* This struct contains device specific data for the IOMMU
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*/
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struct iommu_dev_data {
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struct list_head list; /* For domain->dev_list */
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struct device *alias; /* The Alias Device */
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struct protection_domain *domain; /* Domain the device is bound to */
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atomic_t bind; /* Domain attach reverent count */
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@ -1286,6 +1286,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
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dma_dom->domain.id = domain_id_alloc();
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if (dma_dom->domain.id == 0)
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goto free_dma_dom;
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INIT_LIST_HEAD(&dma_dom->domain.dev_list);
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dma_dom->domain.mode = PAGE_MODE_2_LEVEL;
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dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
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dma_dom->domain.flags = PD_DMA_OPS_MASK;
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@ -1408,6 +1409,7 @@ static int __attach_device(struct device *dev,
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if (alias != devid) {
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if (alias_data->domain == NULL) {
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alias_data->domain = domain;
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list_add(&alias_data->list, &domain->dev_list);
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set_dte_entry(alias, domain);
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}
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@ -1416,6 +1418,7 @@ static int __attach_device(struct device *dev,
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if (dev_data->domain == NULL) {
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dev_data->domain = domain;
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list_add(&dev_data->list, &domain->dev_list);
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set_dte_entry(devid, domain);
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}
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@ -1460,6 +1463,7 @@ static void __detach_device(struct device *dev)
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struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
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struct iommu_dev_data *dev_data = get_dev_data(dev);
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struct iommu_dev_data *alias_data;
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unsigned long flags;
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BUG_ON(!iommu);
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@ -1469,13 +1473,19 @@ static void __detach_device(struct device *dev)
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if (devid != alias) {
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alias_data = get_dev_data(dev_data->alias);
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if (atomic_dec_and_test(&alias_data->bind)) {
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spin_lock_irqsave(&alias_data->domain->lock, flags);
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clear_dte_entry(alias);
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list_del(&alias_data->list);
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spin_unlock_irqrestore(&alias_data->domain->lock, flags);
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alias_data->domain = NULL;
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}
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}
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if (atomic_dec_and_test(&dev_data->bind)) {
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spin_lock_irqsave(&dev_data->domain->lock, flags);
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clear_dte_entry(devid);
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list_del(&dev_data->list);
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spin_unlock_irqrestore(&dev_data->domain->lock, flags);
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dev_data->domain = NULL;
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}
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@ -2294,6 +2304,7 @@ static struct protection_domain *protection_domain_alloc(void)
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domain->id = domain_id_alloc();
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if (!domain->id)
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goto out_err;
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INIT_LIST_HEAD(&domain->dev_list);
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add_domain_to_list(domain);
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