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. So GVT-g
has to know the status of the execlist context.
This function is configurable in the context creation service. Currently,
Only GVT-g will create the "status-change-notification" enabled GEM
context.
v5:
- Only compile this feature when CONFIG_DRM_I915_GVT is enabled.(Tvrtko)
Signed-off-by: Zhi Wang <zhi.a.wang@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 6 ++++++
drivers/gpu/drm/i915/intel_lrc.c | 30 ++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.h | 7 +++++++
3 files changed, 43 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 91f69e5..9688006 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -882,9 +882,15 @@ struct intel_context {
u64 lrc_desc;
uint32_t *lrc_reg_state;
bool initialised;
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+ struct atomic_notifier_head status_notifier_head;
+#endif
} engine[I915_NUM_ENGINES];
u32 ring_buffer_size;
bool use_48bit_addressing_mode;
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+ bool enable_status_change_notification;
+#endif
struct list_head link;
};
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index d97623f..9069836 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -415,6 +415,20 @@ static void execlists_submit_requests(struct drm_i915_gem_request *rq0,
spin_unlock_irq(&dev_priv->uncore.lock);
}
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+static inline void execlists_context_status_change(
+ struct drm_i915_gem_request *req,
+ unsigned long status)
+{
+ if (!req->ctx->enable_status_change_notification)
+ return;
+
+ atomic_notifier_call_chain(
+ &req->ctx->engine[req->engine->id].status_notifier_head,
+ status, req);
+}
+#endif
+
static void execlists_context_unqueue(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *req0 = NULL, *req1 = NULL;
@@ -450,6 +464,13 @@ static void execlists_context_unqueue(struct intel_engine_cs *engine)
if (unlikely(!req0))
return;
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+ execlists_context_status_change(req0, CONTEXT_SCHEDULE_IN);
+
+ if (req1)
+ execlists_context_status_change(req1, CONTEXT_SCHEDULE_IN);
+#endif
+
if (req0->elsp_submitted & engine->idle_lite_restore_wa) {
/*
* WaIdleLiteRestore: make sure we never cause a lite restore
@@ -488,6 +509,10 @@ execlists_check_remove_request(struct intel_engine_cs *engine, u32 ctx_id)
if (--head_req->elsp_submitted > 0)
return 0;
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+ execlists_context_status_change(head_req, CONTEXT_SCHEDULE_OUT);
+#endif
+
list_del(&head_req->execlist_link);
i915_gem_request_unreference(head_req);
@@ -2534,6 +2559,11 @@ static int execlists_context_deferred_alloc(struct intel_context *ctx,
ctx->engine[engine->id].state = ctx_obj;
ctx->engine[engine->id].initialised = engine->init_context == NULL;
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+ if (ctx->enable_status_change_notification)
+ ATOMIC_INIT_NOTIFIER_HEAD(
+ &ctx->engine[engine->id].status_notifier_head);
+#endif
return 0;
error_ringbuf:
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 1afba03..99f84c9 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -57,6 +57,13 @@
#define GEN8_CSB_READ_PTR(csb_status) \
(((csb_status) & GEN8_CSB_READ_PTR_MASK) >> 8)
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+enum {
+ CONTEXT_SCHEDULE_IN = 0,
+ CONTEXT_SCHEDULE_OUT,
+};
+#endif
+
/* 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);
--
1.9.1
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