]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
drm/i915: improve the catch-all evict to handle lock contention
authorMatthew Auld <matthew.auld@intel.com>
Fri, 16 Dec 2022 11:34:56 +0000 (11:34 +0000)
committerRodrigo Vivi <rodrigo.vivi@intel.com>
Fri, 30 Dec 2022 08:04:39 +0000 (03:04 -0500)
commit3f882f2d4f689627c1566c2c92087bc3ff734953
tree6da2479143efa44e7c74c0c729569519f932dde0
parentfff758698842fb6722be37498d8773e0fb47f000
drm/i915: improve the catch-all evict to handle lock contention

The catch-all evict can fail due to object lock contention, since it
only goes as far as trylocking the object, due to us already holding the
vm->mutex. Doing a full object lock here can deadlock, since the
vm->mutex is always our inner lock. Add another execbuf pass which drops
the vm->mutex and then tries to grab the object will the full lock,
before then retrying the eviction. This should be good enough for now to
fix the immediate regression with userspace seeing -ENOSPC from execbuf
due to contended object locks during GTT eviction.

v2 (Mani)
  - Also revamp the docs for the different passes.

Testcase: igt@gem_ppgtt@shrink-vs-evict-*
Fixes: 7e00897be8bf ("drm/i915: Add object locking to i915_gem_evict_for_node and i915_gem_evict_something, v2.")
References: https://gitlab.freedesktop.org/drm/intel/-/issues/7627
References: https://gitlab.freedesktop.org/drm/intel/-/issues/7570
References: https://bugzilla.mozilla.org/show_bug.cgi?id=1779558
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Mani Milani <mani@chromium.org>
Cc: <stable@vger.kernel.org> # v5.18+
Reviewed-by: Mani Milani <mani@chromium.org>
Tested-by: Mani Milani <mani@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221216113456.414183-1-matthew.auld@intel.com
(cherry picked from commit 801fa7a81f6da533cc5442fc40e32c72b76cd42a)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
drivers/gpu/drm/i915/gem/i915_gem_mman.c
drivers/gpu/drm/i915/i915_gem_evict.c
drivers/gpu/drm/i915/i915_gem_evict.h
drivers/gpu/drm/i915/i915_vma.c
drivers/gpu/drm/i915/selftests/i915_gem_evict.c