[PATCH 00/10] drm/amdgpu: Improve page fault handling on GMC v6-8

["Timur Kristóf" <timur.kristof@gmail.com>]

Enable the soft IRQ handler ring on SI, CIK, VI and
delegate the processing of all VM faults to the soft
IRQ handler ring.

Why?

On old GPUs, it may be an issue that handling the interrupts from
VM faults is too slow and the interrupt handler (IH) ring may
overflow, which can cause an eventual hang. This is a concern
especially on SI and CIK where there are some HW limitations
regarding robustness features with some shader instructions,
which in practice means that users can see thousands of VM faults
during normal gaming use even when the game or the UMD don't do
anything wrong.

With this series, we spend much less time in the IRQ handler that
interacts with the HW IH ring, which significantly reduces the
chance of hangs.

There are also a few misc improvements to the GMC v6 code.

Timur Kristóf (10):
  drm/amdgpu/si_ih: Enable soft IRQ handler ring
  drm/amdgpu/cik_ih: Enable soft IRQ handler ring
  drm/amdgpu/iceland_ih: Enable soft IRQ handler ring
  drm/amdgpu/tonga_ih: Enable soft IRQ handler ring
  drm/amdgpu/cz_ih: Enable soft IRQ handler ring
  drm/amdgpu/gmc6: Don't print MC client as it's unknown
  drm/amdgpu/gmc6: Cache VM fault info
  drm/amdgpu/gmc6: Delegate VM faults to soft IRQ handler ring
  drm/amdgpu/gmc7: Delegate VM faults to soft IRQ handler ring
  drm/amdgpu/gmc8: Delegate VM faults to soft IRQ handler ring

 drivers/gpu/drm/amd/amdgpu/cik_ih.c     | 12 ++++++++++++
 drivers/gpu/drm/amd/amdgpu/cz_ih.c      | 10 ++++++++++
 drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c   | 20 ++++++++++++++------
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c   |  6 ++++++
 drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c   |  6 ++++++
 drivers/gpu/drm/amd/amdgpu/iceland_ih.c | 10 ++++++++++
 drivers/gpu/drm/amd/amdgpu/si_ih.c      | 12 ++++++++++++
 drivers/gpu/drm/amd/amdgpu/tonga_ih.c   | 10 ++++++++++
 8 files changed, 80 insertions(+), 6 deletions(-)

-- 
2.51.1