This reverts commit e71391880aa72709fac53f98d96a2d4e8875b9fa.
The RAS issue at the base of this problem appears to have been addressed
Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
Change-Id: I338a985e19cae8e103bd44b0f238314e9460d396
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index caa38e7d502e..bf302c799832 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -255,6 +255,32 @@ 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;
--
2.17.1
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