[PATCH 9/9] drm/amdgpu/gfx7: Enable IP block soft reset as a GPU recovery method

Enable IP block soft reset as a GPU recovery method for GFX7
graphics and compute rings.

This improves current user experience on all GFX7 chips:

* On Kaveri and Kabini there is currently no working
  GPU recovery method so those chips currently require
  the user to manually reset the computer when there
  was a hang.

* On Hawaii and Bonaire, the current GPU recovery method
  always clears the contents of VRAM, which means that
  a buggy (hanging) app can crash the whole graphical
  session, which is less than ideal.

Using GFX IP block soft reset means that we can now
have a working recovery on GFX7 APUs and we can also
move on from GFX hangs on dGPUs without crashing the
whole system.

Tested with the "hard_reset_cp_wait" test case from the
Hang Test Suite created by Natalie Vock and Konstantin Seurer.
This Vulkan testcase waits for an event that never occurs,
effectively a WAIT_REG_MEM packet that intentionally hangs.
IP block soft reset can resolve that hang and allow
the rest of the system to move on and keep functioning
without needing a full ASIC reset.

Tested on the following chips:

Bonaire (Radeon HD 7790)
Hawaii (Radeon R9 390X)
Kaveri (A10-7850K)

Signed-off-by: Timur Kristóf <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
index e31a2101f308..bf5595db6d74 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
@@ -4432,6 +4432,11 @@ static int gfx_v7_0_sw_init(struct amdgpu_ip_block *ip_block)
 	adev->gfx.compute_supported_reset =
 		amdgpu_get_soft_full_reset_mask(&adev->gfx.compute_ring[0]);
 
+	if (!amdgpu_sriov_vf(adev) && !adev->debug_disable_ip_block_soft_reset) {
+		adev->gfx.compute_supported_reset |= AMDGPU_RESET_TYPE_IP_BLOCK_SOFT_RESET;
+		adev->gfx.gfx_supported_reset |= AMDGPU_RESET_TYPE_IP_BLOCK_SOFT_RESET;
+	}
+
 	return r;
 }
 
-- 
2.55.0