@@ -887,6 +887,8 @@ struct intel_context {
struct i915_vma *lrc_vma;
u64 lrc_desc;
uint32_t *lrc_reg_state;
+ bool need_status_change_notification;
+ struct atomic_notifier_head notifier_head;
} engine[I915_NUM_RINGS];
bool root_pointer_dirty;
@@ -438,6 +438,18 @@ static void execlists_submit_requests(struct drm_i915_gem_request *rq0,
execlists_elsp_write(rq0, rq1);
}
+static inline void execlists_context_status_change(
+ struct intel_context *ctx,
+ struct intel_engine_cs *ring,
+ unsigned long status)
+{
+ if (!ctx->engine[ring->id].need_status_change_notification)
+ return;
+
+ atomic_notifier_call_chain(&ctx->engine[ring->id].notifier_head,
+ status, NULL);
+}
+
static void execlists_context_unqueue(struct intel_engine_cs *ring)
{
struct drm_i915_gem_request *req0 = NULL, *req1 = NULL;
@@ -494,6 +506,13 @@ static void execlists_context_unqueue(struct intel_engine_cs *ring)
WARN_ON(req1 && req1->elsp_submitted);
+ execlists_context_status_change(req0->ctx, ring, CONTEXT_SCHEDULE_IN);
+
+ if (req1) {
+ execlists_context_status_change(req1->ctx,
+ ring, CONTEXT_SCHEDULE_IN);
+ }
+
execlists_submit_requests(req0, req1);
}
@@ -514,6 +533,8 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring,
"Never submitted head request\n");
if (--head_req->elsp_submitted <= 0) {
+ execlists_context_status_change(head_req->ctx,
+ ring, CONTEXT_SCHEDULE_OUT);
list_move_tail(&head_req->execlist_link,
&ring->execlist_retired_req_list);
return true;
@@ -2589,6 +2610,13 @@ int __intel_lr_context_deferred_alloc(struct intel_context *ctx,
}
i915_add_request_no_flush(req);
}
+
+ if (params->ctx_needs_status_change_notification) {
+ ctx->engine[ring->id].need_status_change_notification = true;
+ ATOMIC_INIT_NOTIFIER_HEAD(
+ &ctx->engine[ring->id].notifier_head);
+ }
+
return 0;
error_ringbuf:
@@ -54,6 +54,11 @@
#define GEN8_CSB_READ_PTR(csb_status) \
(((csb_status) & GEN8_CSB_READ_PTR_MASK) >> 8)
+enum {
+ CONTEXT_SCHEDULE_IN = 0,
+ 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);
@@ -101,6 +106,7 @@ struct intel_lr_context_alloc_params {
struct intel_engine_cs *ring;
u32 ringbuffer_size;
bool ctx_needs_init;
+ bool ctx_needs_status_change_notification;
};
void intel_lr_context_free(struct intel_context *ctx);
This patch introduces an approach for clients to aware the execlist context status change. For a GVT context, GVT-g kernel device model uses it as the "shadow context", its contents will be copied back to guest after the context is idle. So GVT-g kernel device model has to know the status of the execlist context, also it will switch the render registers when the context is schedued-in/out. This function is configurable as a parameter in the context creation service. Currently, Only GVT-g will create the "status-change-notification" enabled GEM context. Signed-off-by: Zhi Wang <zhi.a.wang@intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/intel_lrc.c | 28 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_lrc.h | 6 ++++++ 3 files changed, 36 insertions(+)