diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-09 08:51:42 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-09 12:50:26 +0000 |
| commit | feed5c7be22c25e9c777c821bcf955a13cf010ab (patch) | |
| tree | b5ae1cafdef8160c2790ce8a49c08783b64cc67f /drivers/gpu/drm/i915/i915_debugfs.c | |
| parent | 921f0c47f22891c90e2eb8f8612a083669c5d1ca (diff) | |
drm/i915: Pin the context as we work on it
Since we now allow the intel_context_unpin() to run unserialised, we
risk our operations under the intel_context_lock_pinned() being run as
the context is unpinned (and thus invalidating our state). We can
atomically acquire the pin, testing to see if it is pinned in the
process, thus ensuring that the state remains consistent during the
course of the whole operation.
Fixes: 841350223816 ("drm/i915/gt: Drop mutex serialisation between context pin/unpin")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200109085142.871563-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 0ac98e39eb75..db184536acef 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -321,16 +321,15 @@ static void print_context_stats(struct seq_file *m, for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { - intel_context_lock_pinned(ce); - if (intel_context_is_pinned(ce)) { + if (intel_context_pin_if_active(ce)) { rcu_read_lock(); if (ce->state) per_file_stats(0, ce->state->obj, &kstats); per_file_stats(0, ce->ring->vma->obj, &kstats); rcu_read_unlock(); + intel_context_unpin(ce); } - intel_context_unlock_pinned(ce); } i915_gem_context_unlock_engines(ctx); @@ -1513,15 +1512,14 @@ static int i915_context_status(struct seq_file *m, void *unused) for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { - intel_context_lock_pinned(ce); - if (intel_context_is_pinned(ce)) { + if (intel_context_pin_if_active(ce)) { seq_printf(m, "%s: ", ce->engine->name); if (ce->state) describe_obj(m, ce->state->obj); describe_ctx_ring(m, ce->ring); seq_putc(m, '\n'); + intel_context_unpin(ce); } - intel_context_unlock_pinned(ce); } i915_gem_context_unlock_engines(ctx); |