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>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201231170405.22843-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_context_types.h

@@ -89,12 +89,13 @@ struct intel_context {
 	unsigned long flags;
 #define CONTEXT_BARRIER_BIT		0
 #define CONTEXT_ALLOC_BIT		1
-#define CONTEXT_VALID_BIT		2
-#define CONTEXT_CLOSED_BIT		3
-#define CONTEXT_USE_SEMAPHORES		4
-#define CONTEXT_BANNED			5
-#define CONTEXT_FORCE_SINGLE_SUBMISSION	6
-#define CONTEXT_NOPREEMPT		7
+#define CONTEXT_INIT_BIT		2
+#define CONTEXT_VALID_BIT		3
+#define CONTEXT_CLOSED_BIT		4
+#define CONTEXT_USE_SEMAPHORES		5
+#define CONTEXT_BANNED			6
+#define CONTEXT_FORCE_SINGLE_SUBMISSION	7
+#define CONTEXT_NOPREEMPT		8
 
 	u32 *lrc_reg_state;
 	union {

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

@@ -2500,48 +2500,9 @@ static int execlists_context_pin(struct intel_context *ce, void *vaddr)
 	return lrc_pin(ce, ce->engine, vaddr);
 }
 
-static int __lrc_setup(struct intel_context *ce,
-		       struct intel_engine_cs *engine)
-{
-	struct drm_i915_gem_object *obj = ce->state->obj;
-	void *vaddr;
-
-	vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
-	if (IS_ERR(vaddr)) {
-		drm_dbg(&engine->i915->drm, "Could not map object pages!\n");
-		return PTR_ERR(vaddr);
-	}
-
-	lrc_init_state(ce, engine, vaddr);
-
-	__i915_gem_object_flush_map(obj, 0, engine->context_size);
-	i915_gem_object_unpin_map(obj);
-	return 0;
-}
-
-static int __execlists_context_alloc(struct intel_context *ce,
-				     struct intel_engine_cs *engine)
-{
-	int err;
-
-	err = lrc_alloc(ce, engine);
-	if (err)
-		return err;
-
-	err = __lrc_setup(ce, engine);
-	if (err)
-		goto err_lrc;
-
-	return 0;
-
-err_lrc:
-	lrc_fini(ce);
-	return err;
-}
-
 static int execlists_context_alloc(struct intel_context *ce)
 {
-	return __execlists_context_alloc(ce, ce->engine);
+	return lrc_alloc(ce, ce->engine);
 }
 
 static const struct intel_context_ops execlists_context_ops = {
@@ -3414,7 +3375,7 @@ static int virtual_context_alloc(struct intel_context *ce)
 {
 	struct virtual_engine *ve = container_of(ce, typeof(*ve), context);
 
-	return __execlists_context_alloc(ce, ve->siblings[0]);
+	return lrc_alloc(ce, ve->siblings[0]);
 }
 
 static int virtual_context_pre_pin(struct intel_context *ce,

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

@@ -916,6 +916,10 @@ lrc_pin(struct intel_context *ce,
 	void *vaddr)
 {
 	ce->lrc_reg_state = vaddr + LRC_STATE_OFFSET;
+
+	if (!__test_and_set_bit(CONTEXT_INIT_BIT, &ce->flags))
+		lrc_init_state(ce, engine, vaddr);
+
 	ce->lrc.lrca = lrc_update_regs(ce, engine, ce->ring->tail);
 	return 0;
 }