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Commit 7c392cbe authored by Joerg Roedel's avatar Joerg Roedel
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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: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 24100055

arch/x86/include/asm/amd_iommu_types.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

arch/x86/kernel/amd_iommu.c

+11 −0
Original line number Diff line number Diff line
@@ -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);