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AMD IOMMU: add event buffer allocation 

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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Joerg Roedel 2008-09-05 14:29:07 +02:00 committed by Ingo Molnar
parent 6d4f343f84
commit 335503e57b
2 changed files with 38 additions and 0 deletions
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29
arch/x86/kernel/amd_iommu_init.c
View File

@ -417,6 +417,30 @@ 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)
{
@ -622,6 +646,7 @@ 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);
}
@ -661,6 +686,10 @@ 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);

9
include/asm-x86/amd_iommu_types.h
View File

@ -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;