x86/amd-iommu: Add support for invalidate_all command

This patch adds support for the invalidate_all command
present in new versions of the AMD IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

2 files changed, 23 insertions, 2 deletions

diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index 5c24e4652347..df62d26ed2ab 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -127,6 +127,7 @@
 #define CMD_COMPL_WAIT          0x01
 #define CMD_INV_DEV_ENTRY       0x02
 #define CMD_INV_IOMMU_PAGES     0x03
+#define CMD_INV_ALL             0x08
 
 #define CMD_COMPL_WAIT_STORE_MASK       0x01
 #define CMD_COMPL_WAIT_INT_MASK         0x02
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index bcf58ea55cfa..d6192bcf9f09 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -463,6 +463,12 @@ static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
                 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
 }
 
+static void build_inv_all(struct iommu_cmd *cmd)
+{
+        memset(cmd, 0, sizeof(*cmd));
+        CMD_SET_TYPE(cmd, CMD_INV_ALL);
+}
+
 /*
  * Writes the command to the IOMMUs command buffer and informs the
  * hardware about the new command.
@@ -567,10 +573,24 @@ static void iommu_flush_tlb_all(struct amd_iommu *iommu)
         iommu_completion_wait(iommu);
 }
 
+static void iommu_flush_all(struct amd_iommu *iommu)
+{
+        struct iommu_cmd cmd;
+
+        build_inv_all(&cmd);
+
+        iommu_queue_command(iommu, &cmd);
+        iommu_completion_wait(iommu);
+}
+
 void iommu_flush_all_caches(struct amd_iommu *iommu)
 {
-        iommu_flush_dte_all(iommu);
-        iommu_flush_tlb_all(iommu);
+        if (iommu_feature(iommu, FEATURE_IA)) {
+                iommu_flush_all(iommu);
+        } else {
+                iommu_flush_dte_all(iommu);
+                iommu_flush_tlb_all(iommu);
+        }
 }
 
 /*