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drm/amdgpu: optimize amdgpu_device_vram_access a bit.

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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>
This commit is contained in:
Christian König 2020-01-24 13:12:22 +01:00 committed by Alex Deucher
parent 42d708db8e
commit ce05ac56e6
1 changed files with 11 additions and 6 deletions

15
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, void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
uint32_t *buf, size_t size, bool write) uint32_t *buf, size_t size, bool write)
{ {
uint64_t last;
unsigned long flags; unsigned long flags;
uint32_t hi = ~0;
uint64_t last;
last = size - 4;
for (last += pos; pos <= last; pos += 4) {
spin_lock_irqsave(&adev->mmio_idx_lock, flags); spin_lock_irqsave(&adev->mmio_idx_lock, flags);
for (last = pos + size; pos < last; pos += 4) {
uint32_t tmp = pos >> 31;
WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)pos) | 0x80000000); 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) if (write)
WREG32_NO_KIQ(mmMM_DATA, *buf++); WREG32_NO_KIQ(mmMM_DATA, *buf++);
else else
*buf++ = RREG32_NO_KIQ(mmMM_DATA); *buf++ = RREG32_NO_KIQ(mmMM_DATA);
spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
} }
spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
} }
/* /*