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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>
This commit is contained in:
Joerg Roedel 2009-11-26 11:13:32 +01:00
parent 241000556f
commit 7c392cbe98
2 changed files with 13 additions and 0 deletions
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2
arch/x86/include/asm/amd_iommu_types.h
View File

@ -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 */

11
arch/x86/kernel/amd_iommu.c
View File

@ -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);