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>

diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index 434e90e..93953d1 100644 (file)
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -235,6 +235,7 @@ extern bool amd_iommu_np_cache;
  */
 struct protection_domain {
        struct list_head list;  /* for list of all protection domains */
+       struct list_head dev_list; /* List of all devices in this domain */
        spinlock_t lock;        /* mostly used to lock the page table*/
        u16 id;                 /* the domain id written to the device table */
        int mode;               /* paging mode (0-6 levels) */
@@ -251,6 +252,7 @@ struct protection_domain {
  * This struct contains device specific data for the IOMMU
  */
 struct iommu_dev_data {
+       struct list_head list;            /* For domain->dev_list */
        struct device *alias;             /* The Alias Device */
        struct protection_domain *domain; /* Domain the device is bound to */
        atomic_t bind;                    /* Domain attach reverent count */

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index f5db7d5..530d608 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1286,6 +1286,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
        dma_dom->domain.id = domain_id_alloc();
        if (dma_dom->domain.id == 0)
                goto free_dma_dom;
+       INIT_LIST_HEAD(&dma_dom->domain.dev_list);
        dma_dom->domain.mode = PAGE_MODE_2_LEVEL;
        dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
        dma_dom->domain.flags = PD_DMA_OPS_MASK;
@@ -1408,6 +1409,7 @@ static int __attach_device(struct device *dev,
        if (alias != devid) {
                if (alias_data->domain == NULL) {
                        alias_data->domain = domain;
+                       list_add(&alias_data->list, &domain->dev_list);
                        set_dte_entry(alias, domain);
                }
 
@@ -1416,6 +1418,7 @@ static int __attach_device(struct device *dev,
 
        if (dev_data->domain == NULL) {
                dev_data->domain = domain;
+               list_add(&dev_data->list, &domain->dev_list);
                set_dte_entry(devid, domain);
        }
 
@@ -1460,6 +1463,7 @@ static void __detach_device(struct device *dev)
        struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
        struct iommu_dev_data *dev_data = get_dev_data(dev);
        struct iommu_dev_data *alias_data;
+       unsigned long flags;
 
        BUG_ON(!iommu);
 
@@ -1469,13 +1473,19 @@ static void __detach_device(struct device *dev)
        if (devid != alias) {
                alias_data = get_dev_data(dev_data->alias);
                if (atomic_dec_and_test(&alias_data->bind)) {
+                       spin_lock_irqsave(&alias_data->domain->lock, flags);
                        clear_dte_entry(alias);
+                       list_del(&alias_data->list);
+                       spin_unlock_irqrestore(&alias_data->domain->lock, flags);
                        alias_data->domain = NULL;
                }
        }
 
        if (atomic_dec_and_test(&dev_data->bind)) {
+               spin_lock_irqsave(&dev_data->domain->lock, flags);
                clear_dte_entry(devid);
+               list_del(&dev_data->list);
+               spin_unlock_irqrestore(&dev_data->domain->lock, flags);
                dev_data->domain = NULL;
        }
 
@@ -2294,6 +2304,7 @@ static struct protection_domain *protection_domain_alloc(void)
        domain->id = domain_id_alloc();
        if (!domain->id)
                goto out_err;
+       INIT_LIST_HEAD(&domain->dev_list);
 
        add_domain_to_list(domain);