drm/i915: Populate logical context during first pin.

This allows us to remove pin_map from state allocation, which saves
us a few retry loops. We won't need this until first pin, anyway.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
[danvet: Resolve context conflict because we don't have the
i915_scheduler.c extraction from the below patches set:
https://lore.kernel.org/intel-gfx/20210203165259.13087-6-chris@chris-wilson.co.uk/]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-19-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/gt/intel_execlists_submission.c

@@ -2457,11 +2457,31 @@ static void execlists_submit_request(struct i915_request *request)
 	spin_unlock_irqrestore(&engine->active.lock, flags);
 }
 
+static int
+__execlists_context_pre_pin(struct intel_context *ce,
+			    struct intel_engine_cs *engine,
+			    struct i915_gem_ww_ctx *ww, void **vaddr)
+{
+	int err;
+
+	err = lrc_pre_pin(ce, engine, ww, vaddr);
+	if (err)
+		return err;
+
+	if (!__test_and_set_bit(CONTEXT_INIT_BIT, &ce->flags)) {
+		lrc_init_state(ce, engine, *vaddr);
+
+		 __i915_gem_object_flush_map(ce->state->obj, 0, engine->context_size);
+	}
+
+	return 0;
+}
+
 static int execlists_context_pre_pin(struct intel_context *ce,
 				     struct i915_gem_ww_ctx *ww,
 				     void **vaddr)
 {
-	return lrc_pre_pin(ce, ce->engine, ww, vaddr);
+	return __execlists_context_pre_pin(ce, ce->engine, ww, vaddr);
 }
 
 static int execlists_context_pin(struct intel_context *ce, void *vaddr)
@@ -3365,8 +3385,8 @@ static int virtual_context_pre_pin(struct intel_context *ce,
 {
 	struct virtual_engine *ve = container_of(ce, typeof(*ve), context);
 
-	/* Note: we must use a real engine class for setting up reg state */
-	return lrc_pre_pin(ce, ve->siblings[0], ww, vaddr);
+	 /* Note: we must use a real engine class for setting up reg state */
+	return __execlists_context_pre_pin(ce, ve->siblings[0], ww, vaddr);
 }
 
 static int virtual_context_pin(struct intel_context *ce, void *vaddr)