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drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2 

This should speed up debugging VRAM access a lot.

v2: add HDP flush/invalidate

Signed-off-by: Christian König <christian.koenig@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 2020-01-31 14:58:05 +01:00 committed by Alex Deucher
parent ce05ac56e6
commit c12b84d6e0
1 changed files with 26 additions and 0 deletions
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26
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -187,6 +187,32 @@ void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
uint32_t hi = ~0;
uint64_t last;
#ifdef CONFIG_64BIT
last = min(pos + size, adev->gmc.visible_vram_size);
if (last > pos) {
void __iomem *addr = adev->mman.aper_base_kaddr + pos;
size_t count = last - pos;
if (write) {
memcpy_toio(addr, buf, count);
mb();
amdgpu_asic_flush_hdp(adev, NULL);
} else {
amdgpu_asic_invalidate_hdp(adev, NULL);
mb();
memcpy_fromio(buf, addr, count);
}
if (count == size)
return;
pos += count;
buf += count / 4;
size -= count;
}
#endif
spin_lock_irqsave(&adev->mmio_idx_lock, flags);
for (last = pos + size; pos < last; pos += 4) {
uint32_t tmp = pos >> 31;