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Subject[PATCH 06/23] AMD IOMMU: add event buffer allocation
Date
This patch adds the allocation of a event buffer for each AMD IOMMU in
the system. The hardware will log events like device page faults or
other errors to this buffer once this is enabled.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu_init.c | 29 +++++++++++++++++++++++++++++
include/asm-x86/amd_iommu_types.h | 9 +++++++++
2 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index da631ab..a902eb6 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -418,6 +418,30 @@ static void __init free_command_buffer(struct amd_iommu *iommu)
free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
}

+/* allocates the memory where the IOMMU will log its events to */
+static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
+{
+ u64 entry;
+ iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(EVT_BUFFER_SIZE));
+
+ if (iommu->evt_buf == NULL)
+ return NULL;
+
+ entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
+ memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
+ &entry, sizeof(entry));
+
+ iommu->evt_buf_size = EVT_BUFFER_SIZE;
+
+ return iommu->evt_buf;
+}
+
+static void __init free_event_buffer(struct amd_iommu *iommu)
+{
+ free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
+}
+
/* sets a specific bit in the device table entry. */
static void set_dev_entry_bit(u16 devid, u8 bit)
{
@@ -623,6 +647,7 @@ static int __init init_iommu_devices(struct amd_iommu *iommu)
static void __init free_iommu_one(struct amd_iommu *iommu)
{
free_command_buffer(iommu);
+ free_event_buffer(iommu);
iommu_unmap_mmio_space(iommu);
}

@@ -662,6 +687,10 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
if (!iommu->cmd_buf)
return -ENOMEM;

+ iommu->evt_buf = alloc_event_buffer(iommu);
+ if (!iommu->evt_buf)
+ return -ENOMEM;
+
init_iommu_from_pci(iommu);
init_iommu_from_acpi(iommu, h);
init_iommu_devices(iommu);
diff --git a/include/asm-x86/amd_iommu_types.h b/include/asm-x86/amd_iommu_types.h
index 82a26fb..eabc316 100644
--- a/include/asm-x86/amd_iommu_types.h
+++ b/include/asm-x86/amd_iommu_types.h
@@ -116,6 +116,10 @@
#define MMIO_CMD_SIZE_SHIFT 56
#define MMIO_CMD_SIZE_512 (0x9ULL << MMIO_CMD_SIZE_SHIFT)

+/* constants for event buffer handling */
+#define EVT_BUFFER_SIZE 8192 /* 512 entries */
+#define EVT_LEN_MASK (0x9ULL << 56)
+
#define PAGE_MODE_1_LEVEL 0x01
#define PAGE_MODE_2_LEVEL 0x02
#define PAGE_MODE_3_LEVEL 0x03
@@ -243,6 +247,11 @@ struct amd_iommu {
/* size of command buffer */
u32 cmd_buf_size;

+ /* event buffer virtual address */
+ u8 *evt_buf;
+ /* size of event buffer */
+ u32 evt_buf_size;
+
/* if one, we need to send a completion wait command */
int need_sync;

--
1.5.6.4



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