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Subject[PATCH 09/21] AMD IOMMU: add protection domain flags
Date
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>
---
arch/x86/include/asm/amd_iommu_types.h | 14 +++++++++-----
arch/x86/kernel/amd_iommu.c | 1 +
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index ac302a2..4862a5b 100644
--- 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 7355da0..6d26544 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -724,6 +724,7 @@ 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;
--
1.5.6.4



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