diff options
| author | Christian König <christian.koenig@amd.com> | 2020-01-24 13:12:22 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-02-07 11:45:17 -0500 |
| commit | ce05ac56e6465d057fea52875151fddf8436b3bc (patch) | |
| tree | f7d7cb7ec6d18324b75ef841a4feda5ce62ad642 /drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | |
| parent | 42d708db8ec0841280cefdec89db6660d2586141 (diff) | |
drm/amdgpu: optimize amdgpu_device_vram_access a bit.
Only write the _HI register when necessary.
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_device.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index a86e80842df9..5d24b1436b9f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -183,20 +183,25 @@ bool amdgpu_device_supports_baco(struct drm_device *dev) void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos, uint32_t *buf, size_t size, bool write) { - uint64_t last; unsigned long flags; + uint32_t hi = ~0; + uint64_t last; + + spin_lock_irqsave(&adev->mmio_idx_lock, flags); + for (last = pos + size; pos < last; pos += 4) { + uint32_t tmp = pos >> 31; - last = size - 4; - for (last += pos; pos <= last; pos += 4) { - 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); + if (tmp != hi) { + WREG32_NO_KIQ(mmMM_INDEX_HI, tmp); + hi = tmp; + } if (write) WREG32_NO_KIQ(mmMM_DATA, *buf++); else *buf++ = RREG32_NO_KIQ(mmMM_DATA); - spin_unlock_irqrestore(&adev->mmio_idx_lock, flags); } + spin_unlock_irqrestore(&adev->mmio_idx_lock, flags); } /* |