diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-30 18:17:10 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-30 21:35:43 +0000 |
| commit | e3793468b4660a9825eb3a149aab1bcd0de7a4f2 (patch) | |
| tree | 548f103e1c902446cf136ce28f0cd550d5ab3661 /drivers/gpu/drm/i915/i915_active.c | |
| parent | e986209c67024c7d1e7c4c9f0ac0d75ef9d968f5 (diff) | |
drm/i915: Use the async worker to avoid reclaim tainting the ggtt->mutex
On Braswell and Broxton (also known as Valleyview and Apollolake), we
need to serialise updates of the GGTT using the big stop_machine()
hammer. This has the side effect of appearing to lockdep as a possible
reclaim (since it uses the cpuhp mutex and that is tainted by per-cpu
allocations). However, we want to use vm->mutex (including ggtt->mutex)
from within the shrinker and so must avoid such possible taints. For this
purpose, we introduced the asynchronous vma binding and we can apply it
to the PIN_GLOBAL so long as take care to add the necessary waits for
the worker afterwards.
Closes: https://gitlab.freedesktop.org/drm/intel/issues/211
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200130181710.2030251-3-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_active.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_active.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c index 3d2e7cf55e52..da58e5d084f4 100644 --- a/drivers/gpu/drm/i915/i915_active.c +++ b/drivers/gpu/drm/i915/i915_active.c @@ -390,13 +390,19 @@ out: return err; } -void i915_active_set_exclusive(struct i915_active *ref, struct dma_fence *f) +struct dma_fence * +i915_active_set_exclusive(struct i915_active *ref, struct dma_fence *f) { + struct dma_fence *prev; + /* We expect the caller to manage the exclusive timeline ordering */ GEM_BUG_ON(i915_active_is_idle(ref)); - if (!__i915_active_fence_set(&ref->excl, f)) + prev = __i915_active_fence_set(&ref->excl, f); + if (!prev) atomic_inc(&ref->count); + + return prev; } bool i915_active_acquire_if_busy(struct i915_active *ref) |