[0/3] drm/panfrost: MMU fixes

Message

Boris Brezillon Feb. 1, 2021, 8:21 a.m. UTC

Hello,

Here are 2 fixes and one improvement for the page fault handling. Those
bugs were found while working on indirect draw supports which requires
the allocation of a big heap buffer for varyings, and the vertex/tiler
shaders seem to have access pattern that trigger those issues. I
remember discussing the first issue with Steve or Robin a while back,
but we never hit it before (now we do :)).

The last patch is a perf improvement: no need to re-enable hardware
interrupts if we know the threaded irq handler will be woken up right
away.

Regards,

Boris

Boris Brezillon (3):
  drm/panfrost: Clear MMU irqs before handling the fault
  drm/panfrost: Don't try to map pages that are already mapped
  drm/panfrost: Stay in the threaded MMU IRQ handler until we've handled
    all IRQs

 drivers/gpu/drm/panfrost/panfrost_mmu.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)