The kernel context exists simply as a placeholder and should never be executed with a render context. It does not need the golden render state, as that will always be applied to a user context. By skipping the initialisation we can avoid issues in attempting to program the golden render context when trying to make the hardware idle.
Testcase: igt/drm_module_reload_basic #byt Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95634 Signed-off-by: Chris Wilson <[email protected]> --- drivers/gpu/drm/i915/i915_gem_context.c | 13 ++++++++----- drivers/gpu/drm/i915/intel_ringbuffer.c | 9 ++++++++- 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index c620fe6c9d96..46cb2c7fd158 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -434,13 +434,16 @@ void i915_gem_context_lost(struct drm_i915_private *dev_priv) i915_gem_context_unpin(engine->last_context, engine); engine->last_context = NULL; } - - /* Force the GPU state to be reinitialised on enabling */ - dev_priv->kernel_context->engine[engine->id].initialised = - engine->init_context == NULL; } - /* Force the GPU state to be reinitialised on enabling */ + /* Force the GPU state to be restored on enabling */ + for_each_engine(engine, dev_priv) { + struct intel_context *ce = + &dev_priv->kernel_context->engine[engine->id]; + + ce->initialised = + !i915.enable_execlists || engine->init_context == NULL; + } dev_priv->kernel_context->remap_slice = ALL_L3_SLICES(dev_priv); } diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 4e0aa7e9d5da..203b7952052a 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2278,7 +2278,14 @@ static int intel_init_ring_buffer(struct drm_device *dev, if (ret) goto error; - ce->initialised = false; + /* The kernel context is only used as a placeholder + * for flushing the active context. It is never used + * for submitting rendering and as such never requires + * the golden render context, and so we can skip + * emitting it when we switch to the kernel context + * (during eviction). + */ + ce->initialised = true; } ringbuf = intel_engine_create_ringbuffer(engine, 32 * PAGE_SIZE); -- 2.8.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
