From c7c3c07d16dd51faddeb6ae665d360be030b31b0 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 24 Jun 2016 14:55:54 +0100 Subject: [PATCH] drm/i915: Treat kernel context as initialised 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. v2: Rebase Testcase: igt/drm_module_reload_basic #byt Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95634 Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/1466776558-21516-3-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_context.c | 14 +++++++++----- drivers/gpu/drm/i915/intel_ringbuffer.c | 10 ++++++++++ 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 419d255..4f4fd65 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -472,13 +472,17 @@ 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 */ + if (!i915.enable_execlists) { + for_each_engine(engine, dev_priv) { + struct intel_context *kce = + &dev_priv->kernel_context->engine[engine->id]; + + kce->initialised = true; + } + } 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 86b80b4..04a2d14 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2338,6 +2338,16 @@ static int intel_ring_context_pin(struct i915_gem_context *ctx, goto error; } + /* The kernel context is only used as a placeholder for flushing the + * active context. It is never used for submitting user rendering and + * as such never requires the golden render context, and so we can skip + * emitting it when we switch to the kernel context. This is required + * as during eviction we cannot allocate and pin the renderstate in + * order to initialise the context. + */ + if (ctx == ctx->i915->kernel_context) + ce->initialised = true; + i915_gem_context_reference(ctx); return 0; -- 2.7.4