Commit 030d5b97 authored by Christian König's avatar Christian König Committed by Alex Deucher

drm/amdgpu: use amdgpu_device_vram_access in amdgpu_ttm_vram_read

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: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Acked-by: default avatarJonathan Kim <Jonathan.Kim@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent c12b84d6
......@@ -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;
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);
size_t bytes = min(size, AMDGPU_TTM_VRAM_MAX_DW_READ * 4);
uint32_t value[AMDGPU_TTM_VRAM_MAX_DW_READ];
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;
......
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