drm/amdgpu: optimize amdgpu_device_vram_access a bit. (ce05ac56) · Commits · 戴 / test

Only write the _HI register when necessary. Signed-off-by:

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

+11 −6

Original line number	Diff line number	Diff line
		@@ -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;

		last = size - 4;
		for (last += pos; pos <= last; pos += 4) {
		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_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);
		}

		/*