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drm/amdgpu: use amdgpu_device_vram_access in amdgpu_ttm_vram_read

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This speeds up the access quite a bit from 2.2 MB/s to
2.9 MB/s on 32bit and 12,8 MB/s on 64bit.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Jonathan Kim <Jonathan.Kim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2020-01-24 13:58:18 +01:00 • committed by Alex Deucher
parent c12b84d6e0
commit 030d5b97a5
1 changed files with 11 additions and 16 deletions
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27
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View file

@ -60,6 +60,8 @@
#include "amdgpu_ras.h"
#include "bif/bif_4_1_d.h"
#define AMDGPU_TTM_VRAM_MAX_DW_READ (size_t)128
static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
struct ttm_mem_reg *mem, unsigned num_pages,
uint64_t offset, unsigned window,
@ -2288,27 +2290,20 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
if (*pos >= adev->gmc.mc_vram_size)
return -ENXIO;
size = min(size, (size_t)(adev->gmc.mc_vram_size - *pos));
while (size) {
unsigned long flags;
uint32_t value;
size_t bytes = min(size, AMDGPU_TTM_VRAM_MAX_DW_READ * 4);
uint32_t value[AMDGPU_TTM_VRAM_MAX_DW_READ];
if (*pos >= adev->gmc.mc_vram_size)
return result;
spin_lock_irqsave(&adev->mmio_idx_lock, flags);
WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
WREG32_NO_KIQ(mmMM_INDEX_HI, *pos >> 31);
value = RREG32_NO_KIQ(mmMM_DATA);
spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
r = put_user(value, (uint32_t *)buf);
amdgpu_device_vram_access(adev, *pos, value, bytes, false);
r = copy_to_user(buf, value, bytes);
if (r)
return r;
result += 4;
buf += 4;
*pos += 4;
size -= 4;
result += bytes;
buf += bytes;
*pos += bytes;
size -= bytes;
}
return result;