From: Chris Wilson Date: Fri, 6 Jan 2017 15:20:13 +0000 (+0000) Subject: drm/i915: Simplify testing for am-I-the-kernel-context? X-Git-Tag: v4.14-rc1~674^2~37^2~551 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=984ff29f74c0c130b43f0c5b0fe0fbca5de0fddc;p=platform%2Fkernel%2Flinux-rpi3.git drm/i915: Simplify testing for am-I-the-kernel-context? The kernel context (dev_priv->kernel_context) is unique in that it is not associated with any user filp - it is the only one with ctx->file_priv == NULL. This is a simpler test than comparing it against dev_priv->kernel_context which involves some pointer dancing. In checking that this is true, we notice that the gvt context is allocating itself a i915_hw_ppgtt it doesn't use and not flagging that its file_priv should be invalid. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20170106152013.24684-5-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index e604672..f671d05 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4230,7 +4230,7 @@ static void assert_kernel_context_is_current(struct drm_i915_private *dev_priv) enum intel_engine_id id; for_each_engine(engine, dev_priv, id) - GEM_BUG_ON(engine->last_retired_context != dev_priv->kernel_context); + GEM_BUG_ON(!i915_gem_context_is_kernel(engine->last_retired_context)); } int i915_gem_suspend(struct drm_i915_private *dev_priv) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 07ac811..40a6939 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -413,14 +413,17 @@ i915_gem_context_create_gvt(struct drm_device *dev) if (ret) return ERR_PTR(ret); - ctx = i915_gem_create_context(to_i915(dev), NULL); + ctx = __create_hw_context(to_i915(dev), NULL); if (IS_ERR(ctx)) goto out; + ctx->file_priv = ERR_PTR(-EBADF); i915_gem_context_set_closed(ctx); /* not user accessible */ i915_gem_context_clear_bannable(ctx); i915_gem_context_set_force_single_submission(ctx); ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */ + + GEM_BUG_ON(i915_gem_context_is_kernel(ctx)); out: mutex_unlock(&dev->struct_mutex); return ctx; @@ -472,6 +475,8 @@ int i915_gem_context_init(struct drm_i915_private *dev_priv) ctx->priority = I915_PRIORITY_MIN; /* lowest priority; idle task */ dev_priv->kernel_context = ctx; + GEM_BUG_ON(!i915_gem_context_is_kernel(ctx)); + DRM_DEBUG_DRIVER("%s context support initialized\n", i915.enable_execlists ? "LR" : dev_priv->hw_context_size ? "HW" : "fake"); @@ -524,6 +529,8 @@ void i915_gem_context_fini(struct drm_i915_private *dev_priv) lockdep_assert_held(&dev_priv->drm.struct_mutex); + GEM_BUG_ON(!i915_gem_context_is_kernel(dctx)); + context_close(dctx); dev_priv->kernel_context = NULL; @@ -549,6 +556,8 @@ int i915_gem_context_open(struct drm_device *dev, struct drm_file *file) ctx = i915_gem_create_context(to_i915(dev), file_priv); mutex_unlock(&dev->struct_mutex); + GEM_BUG_ON(i915_gem_context_is_kernel(ctx)); + if (IS_ERR(ctx)) { idr_destroy(&file_priv->context_idr); return PTR_ERR(ctx); @@ -968,6 +977,8 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, if (IS_ERR(ctx)) return PTR_ERR(ctx); + GEM_BUG_ON(i915_gem_context_is_kernel(ctx)); + args->ctx_id = ctx->user_handle; DRM_DEBUG("HW context %d created\n", args->ctx_id); diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h index 89f6764..0ac750b 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.h +++ b/drivers/gpu/drm/i915/i915_gem_context.h @@ -246,6 +246,11 @@ static inline bool i915_gem_context_is_default(const struct i915_gem_context *c) return c->user_handle == DEFAULT_CONTEXT_HANDLE; } +static inline bool i915_gem_context_is_kernel(struct i915_gem_context *ctx) +{ + return !ctx->file_priv; +} + /* i915_gem_context.c */ int __must_check i915_gem_context_init(struct drm_i915_private *dev_priv); void i915_gem_context_lost(struct drm_i915_private *dev_priv); diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index a9eefb1..6db246a 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -786,7 +786,7 @@ static int execlists_context_pin(struct intel_engine_cs *engine, flags = PIN_GLOBAL; if (ctx->ggtt_offset_bias) flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias; - if (ctx == ctx->i915->kernel_context) + if (i915_gem_context_is_kernel(ctx)) flags |= PIN_HIGH; ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN, flags); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index e84d488..0971ac3 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1974,7 +1974,7 @@ static int intel_ring_context_pin(struct intel_engine_cs *engine, unsigned int flags; flags = 0; - if (ctx == ctx->i915->kernel_context) + if (i915_gem_context_is_kernel(ctx)) flags = PIN_HIGH; ret = context_pin(ctx, flags); @@ -1989,7 +1989,7 @@ static int intel_ring_context_pin(struct intel_engine_cs *engine, * as during eviction we cannot allocate and pin the renderstate in * order to initialise the context. */ - if (ctx == ctx->i915->kernel_context) + if (i915_gem_context_is_kernel(ctx)) ce->initialised = true; i915_gem_context_get(ctx);