> -----Original Message----- > From: Joonas Lahtinen [mailto:joonas.lahtinen@xxxxxxxxxxxxxxx] > Sent: Thursday, June 09, 2016 1:45 PM > To: Wang, Zhi A <zhi.a.wang@xxxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Cc: chris@xxxxxxxxxxxxxxxxxx; Lv, Zhiyuan <zhiyuan.lv@xxxxxxxxx>; Tian, Kevin > <kevin.tian@xxxxxxxxx>; tvrtko.ursulin@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v9 08/10] drm/i915: Introduce execlist context status > change notification > > On to, 2016-06-09 at 03:34 -0400, Zhi Wang wrote: > > This patch introduces an approach to track the execlist context status > > change. > > > > GVT-g uses GVT context as the "shadow context". The content inside GVT > > context will be copied back to guest after the context is idle. And > > GVT-g has to know the status of the execlist context. > > > > This function is configurable when creating a new GEM context. > > Currently, Only GVT-g will create the "status-change-notification" > > enabled GEM context. > > > > v8: > > > > - Remove the boolean flag in struct i915_gem_context. (Joonas) > > > > v7: > > > > - Remove per-engine ctx status notifiers. Use one status notifier for > > all engines. (Joonas) > > - Add prefix "INTEL_" for related definitions. (Joonas) > > - Refine the comments in execlists_context_status_change(). (Joonas) > > > > v6: > > > > - When !CONFIG_DRM_I915_GVT, make GVT code as dead code then > compiler > > could automatically eliminate them for us. (Chris) > > - Always initialize the notifier header, so it could be switched > > on/off at runtime. (Chris) > > > > v5: > > > > - Only compile this feature when CONFIG_DRM_I915_GVT is > > enabled.(Tvrtko) > > > > Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx> > > Signed-off-by: Zhi Wang <zhi.a.wang@xxxxxxxxx> > > --- > > drivers/gpu/drm/i915/i915_drv.h | 1 + > > drivers/gpu/drm/i915/i915_gem_context.c | 1 + > > drivers/gpu/drm/i915/intel_lrc.c | 22 ++++++++++++++++++++++ > > drivers/gpu/drm/i915/intel_lrc.h | 5 +++++ > > 4 files changed, 29 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/i915_drv.h > > b/drivers/gpu/drm/i915/i915_drv.h index a9e22200..c14eb56 100644 > > --- a/drivers/gpu/drm/i915/i915_drv.h > > +++ b/drivers/gpu/drm/i915/i915_drv.h > > @@ -880,6 +880,7 @@ struct i915_gem_context { > > } engine[I915_NUM_ENGINES]; > > u32 ring_size; > > u32 desc_template; > > + struct atomic_notifier_head status_notifier; > > > > struct list_head link; > > > > diff --git a/drivers/gpu/drm/i915/i915_gem_context.c > > b/drivers/gpu/drm/i915/i915_gem_context.c > > index e636d85..3c1b83e 100644 > > --- a/drivers/gpu/drm/i915/i915_gem_context.c > > +++ b/drivers/gpu/drm/i915/i915_gem_context.c > > @@ -298,6 +298,7 @@ __create_hw_context(struct drm_device *dev, > > ctx->ring_size = 4 * PAGE_SIZE; > > ctx->desc_template = GEN8_CTX_ADDRESSING_MODE(dev_priv) << > > GEN8_CTX_ADDRESSING_MODE_SHIFT; > > + ATOMIC_INIT_NOTIFIER_HEAD(&ctx->status_notifier); > > > > return ctx; > > > > diff --git a/drivers/gpu/drm/i915/intel_lrc.c > > b/drivers/gpu/drm/i915/intel_lrc.c > > index 2116f86..7f42b15 100644 > > --- a/drivers/gpu/drm/i915/intel_lrc.c > > +++ b/drivers/gpu/drm/i915/intel_lrc.c > > @@ -404,6 +404,20 @@ static void execlists_submit_requests(struct > drm_i915_gem_request *rq0, > > spin_unlock_irq(&dev_priv->uncore.lock); > > } > > > > +static inline void execlists_context_status_change( > > + struct drm_i915_gem_request *rq, > > + unsigned long status) > > +{ > > + /* > > + * Only used when GVT-g is enabled now. When GVT-g is disabled, > > + * The compiler should eliminate this function as dead-code. > > + */ > > + if (!IS_ENABLED(CONFIG_DRM_I915_GVT)) > > + return; > > + > > + atomic_notifier_call_chain(&rq->ctx->status_notifier, status, rq); } > > + > > static void execlists_context_unqueue(struct intel_engine_cs *engine) > > { > > struct drm_i915_gem_request *req0 = NULL, *req1 = NULL; @@ -439,6 > > +453,12 @@ static void execlists_context_unqueue(struct intel_engine_cs > *engine) > > if (unlikely(!req0)) > > return; > > > > + execlists_context_status_change(req0, INTEL_CONTEXT_SCHEDULE_IN); > > + > > + if (req1) > > + execlists_context_status_change(req1, > > + INTEL_CONTEXT_SCHEDULE_IN); > No it would exceed 80 characters. > Indentation is incorrect here. Would it also fit on one line? > > > + > > if (req0->elsp_submitted & engine->idle_lite_restore_wa) { > > /* > > * WaIdleLiteRestore: make sure we never cause a lite restore @@ > > -477,6 +497,8 @@ execlists_check_remove_request(struct intel_engine_cs > *engine, u32 ctx_id) > > if (--head_req->elsp_submitted > 0) > > return 0; > > > > + execlists_context_status_change(head_req, > > +INTEL_CONTEXT_SCHEDULE_OUT); > > + > > list_del(&head_req->execlist_link); > > i915_gem_request_unreference(head_req); > > > > diff --git a/drivers/gpu/drm/i915/intel_lrc.h > > b/drivers/gpu/drm/i915/intel_lrc.h > > index a8db42a..2b8255c 100644 > > --- a/drivers/gpu/drm/i915/intel_lrc.h > > +++ b/drivers/gpu/drm/i915/intel_lrc.h > > @@ -57,6 +57,11 @@ > > #define GEN8_CSB_READ_PTR(csb_status) \ > > (((csb_status) & GEN8_CSB_READ_PTR_MASK) >> 8) > > > > +enum { > > + INTEL_CONTEXT_SCHEDULE_IN = 0, > > + INTEL_CONTEXT_SCHEDULE_OUT, > > +}; > > + > > /* Logical Rings */ > > int intel_logical_ring_alloc_request_extras(struct > > drm_i915_gem_request *request); > > int intel_logical_ring_reserve_space(struct drm_i915_gem_request > > *request); > -- > Joonas Lahtinen > Open Source Technology Center > Intel Corporation _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
