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drm/i915: Hold a reference to the active HW context

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For virtual engines, we need to keep the HW context alive while it
remains in use. For regular HW contexts, they are created and kept alive
until the end of the GEM context. For simplicity, generalise the
requirements and keep an active reference to each HW context.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190318212347.30146-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-03-18 21:23:47 +00:00
parent 206c2f812f
commit 4c5896dc4c
7 changed files with 35 additions and 5 deletions
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6
drivers/gpu/drm/i915/intel_context.c
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@@ -172,6 +172,7 @@ intel_context_pin(struct i915_gem_context *ctx,
list_add(&ce->active_link, &ctx->active_engines);
mutex_unlock(&ctx->mutex);
intel_context_get(ce);
smp_mb__before_atomic(); /* flush pin before it is visible */
}
@@ -192,6 +193,7 @@ void intel_context_unpin(struct intel_context *ce)
return;
/* We may be called from inside intel_context_pin() to evict another */
intel_context_get(ce);
mutex_lock_nested(&ce->pin_mutex, SINGLE_DEPTH_NESTING);
if (likely(atomic_dec_and_test(&ce->pin_count))) {
@@ -202,9 +204,11 @@ void intel_context_unpin(struct intel_context *ce)
mutex_unlock(&ce->gem_context->mutex);
i915_gem_context_put(ce->gem_context);
intel_context_put(ce);
}
mutex_unlock(&ce->pin_mutex);
intel_context_put(ce);
}
static void intel_context_retire(struct i915_active_request *active,
@@ -221,6 +225,8 @@ intel_context_init(struct intel_context *ce,
struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
kref_init(&ce->ref);
ce->gem_context = ctx;
ce->engine = engine;
ce->ops = engine->cops;