drm/i915: Introduce execlist context status change notification

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.

v10:

- Fix the identation. (Joonas)

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@linux.intel.com> (v8)
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466078825-6662-8-git-send-email-zhi.a.wang@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

4 files changed, 29 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 369fe888c921..85b92b285670 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -882,6 +882,7 @@ 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 bd1360259ac5..d9e30e111067 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 2116f865a8d6..67d19bd5a481 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);
+
         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 a8db42a9c50f..2b8255c19dcc 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);