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Subject[PATCH 2/2] x86/amd-iommu: Add support for invalidate_all command
Date
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>
---
arch/x86/include/asm/amd_iommu_types.h | 1 +
arch/x86/kernel/amd_iommu.c | 24 ++++++++++++++++++++++--
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 5c24e46..df62d26 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 d609610..a9b5cf7 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_DEV_ENTRY);
+}
+
/*
* 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);
+ }
}

/*
--
1.7.1



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