AMD IOMMU: add protection domain flags

Imapct: add a new struct member to 'struct protection_domain'

When using protection domains for dma_ops and KVM its better to know for
which subsystem it was allocated. Add a flags member to struct
protection domain for that purpose.

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 ac302a2..4862a5b 100644 (file)
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -190,16 +190,20 @@
 /* FIXME: move this macro to <linux/pci.h> */
 #define PCI_BUS(x) (((x) >> 8) & 0xff)
 
+/* Protection domain flags */
+#define PD_DMA_OPS_MASK                (1UL << 0) /* domain used for dma_ops */
+
 /*
  * This structure contains generic data for  IOMMU protection domains
  * independent of their use.
  */
 struct protection_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) */
-       u64 *pt_root;    /* page table root pointer */
-       void *priv;      /* private data */
+       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) */
+       u64 *pt_root;           /* page table root pointer */
+       unsigned long flags;    /* flags to find out type of domain */
+       void *priv;             /* private data */
 };
 
 /*

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 2b6b8e0..bb28e2c 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -729,6 +729,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
                goto free_dma_dom;
        dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
        dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+       dma_dom->domain.flags = PD_DMA_OPS_MASK;
        dma_dom->domain.priv = dma_dom;
        if (!dma_dom->domain.pt_root)
                goto free_dma_dom;