drm/i915: Allocate a drm_atomic_state for the legacy modeset code

For the atomic conversion, the mode set paths need to be changed to rely
on an atomic state instead of using the staged config. By using an
atomic state for the legacy code, we will be able to convert the code
base in small chunks.

v2: Squash patch that adds stat argument to intel_set_mode(). (Ander)
    Make every caller of intel_set_mode() allocate state. (Daniel)
    Call drm_atomic_state_clear() in set config's error path. (Daniel)

v3: Copy staged config to atomic state in force restore path. (Ander)

v4: Don't update ->new_config for disabled pipes in __intel_set_mode(),
    since it is expected to be NULL in that case. (Ander)

v5: Don't change return type of intel_modeset_pipe_config(). (Chandra)

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
[danvet: Remove spurious ret local variable due to changes in v5.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -83,7 +83,8 @@ static void ironlake_pch_clock_get(struct intel_crtc *crtc,
 				   struct intel_crtc_state *pipe_config);
 
 static int intel_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
-			  int x, int y, struct drm_framebuffer *old_fb);
+			  int x, int y, struct drm_framebuffer *old_fb,
+			  struct drm_atomic_state *state);
 static int intel_framebuffer_init(struct drm_device *dev,
 				  struct intel_framebuffer *ifb,
 				  struct drm_mode_fb_cmd2 *mode_cmd,
@@ -8907,6 +8908,7 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
 	struct drm_device *dev = encoder->dev;
 	struct drm_framebuffer *fb;
 	struct drm_mode_config *config = &dev->mode_config;
+	struct drm_atomic_state *state = NULL;
 	int ret, i = -1;
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
@@ -8988,6 +8990,12 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
 	old->load_detect_temp = true;
 	old->release_fb = NULL;
 
+	state = drm_atomic_state_alloc(dev);
+	if (!state)
+		return false;
+
+	state->acquire_ctx = ctx;
+
 	if (!mode)
 		mode = &load_detect_mode;
 
@@ -9010,7 +9018,7 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
 		goto fail;
 	}
 
-	if (intel_set_mode(crtc, mode, 0, 0, fb)) {
+	if (intel_set_mode(crtc, mode, 0, 0, fb, state)) {
 		DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
 		if (old->release_fb)
 			old->release_fb->funcs->destroy(old->release_fb);
@@ -9029,6 +9037,11 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
 	else
 		intel_crtc->new_config = NULL;
 fail_unlock:
+	if (state) {
+		drm_atomic_state_free(state);
+		state = NULL;
+	}
+
 	if (ret == -EDEADLK) {
 		drm_modeset_backoff(ctx);
 		goto retry;
@@ -9041,22 +9054,34 @@ void intel_release_load_detect_pipe(struct drm_connector *connector,
 				    struct intel_load_detect_pipe *old,
 				    struct drm_modeset_acquire_ctx *ctx)
 {
+	struct drm_device *dev = connector->dev;
 	struct intel_encoder *intel_encoder =
 		intel_attached_encoder(connector);
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_crtc *crtc = encoder->crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	struct drm_atomic_state *state;
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
 		      connector->base.id, connector->name,
 		      encoder->base.id, encoder->name);
 
 	if (old->load_detect_temp) {
+		state = drm_atomic_state_alloc(dev);
+		if (!state) {
+			DRM_DEBUG_KMS("can't release load detect pipe\n");
+			return;
+		}
+
+		state->acquire_ctx = ctx;
+
 		to_intel_connector(connector)->new_encoder = NULL;
 		intel_encoder->new_crtc = NULL;
 		intel_crtc->new_enabled = false;
 		intel_crtc->new_config = NULL;
-		intel_set_mode(crtc, NULL, 0, 0, NULL);
+		intel_set_mode(crtc, NULL, 0, 0, NULL, state);
+
+		drm_atomic_state_free(state);
 
 		if (old->release_fb) {
 			drm_framebuffer_unregister_private(old->release_fb);
@@ -10449,10 +10474,22 @@ static bool check_digital_port_conflicts(struct drm_device *dev)
 	return true;
 }
 
+static void
+clear_intel_crtc_state(struct intel_crtc_state *crtc_state)
+{
+	struct drm_crtc_state tmp_state;
+
+	/* Clear only the intel specific part of the crtc state */
+	tmp_state = crtc_state->base;
+	memset(crtc_state, 0, sizeof *crtc_state);
+	crtc_state->base = tmp_state;
+}
+
 static struct intel_crtc_state *
 intel_modeset_pipe_config(struct drm_crtc *crtc,
 			  struct drm_framebuffer *fb,
-			  struct drm_display_mode *mode)
+			  struct drm_display_mode *mode,
+			  struct drm_atomic_state *state)
 {
 	struct drm_device *dev = crtc->dev;
 	struct intel_encoder *encoder;
@@ -10470,9 +10507,11 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
 		return ERR_PTR(-EINVAL);
 	}
 
-	pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
-	if (!pipe_config)
-		return ERR_PTR(-ENOMEM);
+	pipe_config = intel_atomic_get_crtc_state(state, to_intel_crtc(crtc));
+	if (IS_ERR(pipe_config))
+		return pipe_config;
+
+	clear_intel_crtc_state(pipe_config);
 
 	pipe_config->base.crtc = crtc;
 	drm_mode_copy(&pipe_config->base.adjusted_mode, mode);
@@ -10569,7 +10608,6 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
 
 	return pipe_config;
 fail:
-	kfree(pipe_config);
 	return ERR_PTR(ret);
 }
 
@@ -11248,6 +11286,7 @@ static struct intel_crtc_state *
 intel_modeset_compute_config(struct drm_crtc *crtc,
 			     struct drm_display_mode *mode,
 			     struct drm_framebuffer *fb,
+			     struct drm_atomic_state *state,
 			     unsigned *modeset_pipes,
 			     unsigned *prepare_pipes,
 			     unsigned *disable_pipes)
@@ -11258,22 +11297,21 @@ intel_modeset_compute_config(struct drm_crtc *crtc,
 				     prepare_pipes, disable_pipes);
 
 	if ((*modeset_pipes) == 0)
-		goto out;
+		return NULL;
 
 	/*
 	 * Note this needs changes when we start tracking multiple modes
 	 * and crtcs.  At that point we'll need to compute the whole config
 	 * (i.e. one pipe_config for each crtc) rather than just the one
 	 * for this crtc.
 	 */
-	pipe_config = intel_modeset_pipe_config(crtc, fb, mode);
-	if (IS_ERR(pipe_config)) {
-		goto out;
-	}
+	pipe_config = intel_modeset_pipe_config(crtc, fb, mode, state);
+	if (IS_ERR(pipe_config))
+		return pipe_config;
+
 	intel_dump_pipe_config(to_intel_crtc(crtc), pipe_config,
 			       "[modeset]");
 
-out:
 	return pipe_config;
 }
 
@@ -11318,13 +11356,20 @@ static int __intel_set_mode(struct drm_crtc *crtc,
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_display_mode *saved_mode;
+	struct intel_crtc_state *crtc_state_copy = NULL;
 	struct intel_crtc *intel_crtc;
 	int ret = 0;
 
 	saved_mode = kmalloc(sizeof(*saved_mode), GFP_KERNEL);
 	if (!saved_mode)
 		return -ENOMEM;
 
+	crtc_state_copy = kmalloc(sizeof(*crtc_state_copy), GFP_KERNEL);
+	if (!crtc_state_copy) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
 	*saved_mode = crtc->mode;
 
 	if (modeset_pipes)
@@ -11411,6 +11456,22 @@ static int __intel_set_mode(struct drm_crtc *crtc,
 	if (ret && crtc->state->enable)
 		crtc->mode = *saved_mode;
 
+	if (ret == 0 && pipe_config) {
+		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+		/* The pipe_config will be freed with the atomic state, so
+		 * make a copy. */
+		memcpy(crtc_state_copy, intel_crtc->config,
+		       sizeof *crtc_state_copy);
+		intel_crtc->config = crtc_state_copy;
+		intel_crtc->base.state = &crtc_state_copy->base;
+
+		if (modeset_pipes)
+			intel_crtc->new_config = intel_crtc->config;
+	} else {
+		kfree(crtc_state_copy);
+	}
+
 	kfree(saved_mode);
 	return ret;
 }
@@ -11436,27 +11497,81 @@ static int intel_set_mode_pipes(struct drm_crtc *crtc,
 
 static int intel_set_mode(struct drm_crtc *crtc,
 			  struct drm_display_mode *mode,
-			  int x, int y, struct drm_framebuffer *fb)
+			  int x, int y, struct drm_framebuffer *fb,
+			  struct drm_atomic_state *state)
 {
 	struct intel_crtc_state *pipe_config;
 	unsigned modeset_pipes, prepare_pipes, disable_pipes;
+	int ret = 0;
 
-	pipe_config = intel_modeset_compute_config(crtc, mode, fb,
+	pipe_config = intel_modeset_compute_config(crtc, mode, fb, state,
 						   &modeset_pipes,
 						   &prepare_pipes,
 						   &disable_pipes);
 
-	if (IS_ERR(pipe_config))
-		return PTR_ERR(pipe_config);
+	if (IS_ERR(pipe_config)) {
+		ret = PTR_ERR(pipe_config);
+		goto out;
+	}
+
+	ret = intel_set_mode_pipes(crtc, mode, x, y, fb, pipe_config,
+				   modeset_pipes, prepare_pipes,
+				   disable_pipes);
+	if (ret)
+		goto out;
 
-	return intel_set_mode_pipes(crtc, mode, x, y, fb, pipe_config,
-				    modeset_pipes, prepare_pipes,
-				    disable_pipes);
+out:
+	return ret;
 }
 
 void intel_crtc_restore_mode(struct drm_crtc *crtc)
 {
-	intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, crtc->primary->fb);
+	struct drm_device *dev = crtc->dev;
+	struct drm_atomic_state *state;
+	struct intel_encoder *encoder;
+	struct intel_connector *connector;
+	struct drm_connector_state *connector_state;
+
+	state = drm_atomic_state_alloc(dev);
+	if (!state) {
+		DRM_DEBUG_KMS("[CRTC:%d] mode restore failed, out of memory",
+			      crtc->base.id);
+		return;
+	}
+
+	state->acquire_ctx = dev->mode_config.acquire_ctx;
+
+	/* The force restore path in the HW readout code relies on the staged
+	 * config still keeping the user requested config while the actual
+	 * state has been overwritten by the configuration read from HW. We
+	 * need to copy the staged config to the atomic state, otherwise the
+	 * mode set will just reapply the state the HW is already in. */
+	for_each_intel_encoder(dev, encoder) {
+		if (&encoder->new_crtc->base != crtc)
+			continue;
+
+		for_each_intel_connector(dev, connector) {
+			if (connector->new_encoder != encoder)
+				continue;
+
+			connector_state = drm_atomic_get_connector_state(state, &connector->base);
+			if (IS_ERR(connector_state)) {
+				DRM_DEBUG_KMS("Failed to add [CONNECTOR:%d:%s] to state: %ld\n",
+					      connector->base.base.id,
+					      connector->base.name,
+					      PTR_ERR(connector_state));
+				continue;
+			}
+
+			connector_state->crtc = crtc;
+			connector_state->best_encoder = &encoder->base;
+		}
+	}
+
+	intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, crtc->primary->fb,
+		       state);
+
+	drm_atomic_state_free(state);
 }
 
 #undef for_each_intel_crtc_masked
@@ -11781,6 +11896,7 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 {
 	struct drm_device *dev;
 	struct drm_mode_set save_set;
+	struct drm_atomic_state *state = NULL;
 	struct intel_set_config *config;
 	struct intel_crtc_state *pipe_config;
 	unsigned modeset_pipes, prepare_pipes, disable_pipes;
@@ -11825,12 +11941,20 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 	 * such cases. */
 	intel_set_config_compute_mode_changes(set, config);
 
+	state = drm_atomic_state_alloc(dev);
+	if (!state) {
+		ret = -ENOMEM;
+		goto out_config;
+	}
+
+	state->acquire_ctx = dev->mode_config.acquire_ctx;
+
 	ret = intel_modeset_stage_output_state(dev, set, config);
 	if (ret)
 		goto fail;
 
 	pipe_config = intel_modeset_compute_config(set->crtc, set->mode,
-						   set->fb,
+						   set->fb, state,
 						   &modeset_pipes,
 						   &prepare_pipes,
 						   &disable_pipes);
@@ -11850,10 +11974,6 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 		 */
 	}
 
-	/* set_mode will free it in the mode_changed case */
-	if (!config->mode_changed)
-		kfree(pipe_config);
-
 	intel_update_pipe_size(to_intel_crtc(set->crtc));
 
 	if (config->mode_changed) {
@@ -11899,6 +12019,8 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 fail:
 		intel_set_config_restore_state(dev, config);
 
+		drm_atomic_state_clear(state);
+
 		/*
 		 * HACK: if the pipe was on, but we didn't have a framebuffer,
 		 * force the pipe off to avoid oopsing in the modeset code
@@ -11911,11 +12033,15 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 		/* Try to restore the config */
 		if (config->mode_changed &&
 		    intel_set_mode(save_set.crtc, save_set.mode,
-				   save_set.x, save_set.y, save_set.fb))
+				   save_set.x, save_set.y, save_set.fb,
+				   state))
 			DRM_ERROR("failed to restore config after modeset failure\n");
 	}
 
 out_config:
+	if (state)
+		drm_atomic_state_free(state);
+
 	intel_set_config_free(config);
 	return ret;
 }
@@ -13968,8 +14094,7 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 			struct drm_crtc *crtc =
 				dev_priv->pipe_to_crtc_mapping[pipe];
 
-			intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y,
-				       crtc->primary->fb);
+			intel_crtc_restore_mode(crtc);
 		}
 	} else {
 		intel_modeset_update_staged_output_state(dev);