x86/amd-iommu: Implement protection domain list
This patch adds code to keep a global list of all protection
domains. This allows to simplify the resume code.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index b2c19f4..0c4319b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -985,6 +985,31 @@
*
****************************************************************************/
+/*
+ * This function adds a protection domain to the global protection domain list
+ */
+static void add_domain_to_list(struct protection_domain *domain)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&amd_iommu_pd_lock, flags);
+ list_add(&domain->list, &amd_iommu_pd_list);
+ spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
+}
+
+/*
+ * This function removes a protection domain to the global
+ * protection domain list
+ */
+static void del_domain_from_list(struct protection_domain *domain)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&amd_iommu_pd_lock, flags);
+ list_del(&domain->list);
+ spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
+}
+
static u16 domain_id_alloc(void)
{
unsigned long flags;
@@ -1073,6 +1098,8 @@
if (!dom)
return;
+ del_domain_from_list(&dom->domain);
+
free_pagetable(&dom->domain);
for (i = 0; i < APERTURE_MAX_RANGES; ++i) {
@@ -1113,6 +1140,8 @@
dma_dom->need_flush = false;
dma_dom->target_dev = 0xffff;
+ add_domain_to_list(&dma_dom->domain);
+
if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL))
goto free_dma_dom;
@@ -2188,6 +2217,8 @@
if (!domain)
return;
+ del_domain_from_list(domain);
+
if (domain->id)
domain_id_free(domain->id);
@@ -2207,6 +2238,8 @@
if (!domain->id)
goto out_err;
+ add_domain_to_list(domain);
+
return domain;
out_err: