From 6066677cfd9d73734ab678b9d14013c860f0f732 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Thu, 9 Jul 2015 13:15:34 +1000
Subject: drm/fb: drop panic handling

This really doesn't seem to have much chance of working anymore,

esp for irq context, qxl at least tries to talk to the hw,
and waits for irqs, and fails.

with runtime pm and other stuff I think we should just
bail on this for now.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 26 --------------------------
 1 file changed, 26 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index cac422916c7a..eaf652b389d9 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -429,24 +429,6 @@ static bool drm_fb_helper_force_kernel_mode(void)
 	return error;
 }
 
-static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
-			void *panic_str)
-{
-	/*
-	 * It's a waste of time and effort to switch back to text console
-	 * if the kernel should reboot before panic messages can be seen.
-	 */
-	if (panic_timeout < 0)
-		return 0;
-
-	pr_err("panic occurred, switching back to text console\n");
-	return drm_fb_helper_force_kernel_mode();
-}
-
-static struct notifier_block paniced = {
-	.notifier_call = drm_fb_helper_panic,
-};
-
 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 {
 	struct drm_device *dev = fb_helper->dev;
@@ -672,9 +654,6 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 	if (!list_empty(&fb_helper->kernel_fb_list)) {
 		list_del(&fb_helper->kernel_fb_list);
 		if (list_empty(&kernel_fb_helper_list)) {
-			pr_info("drm: unregistered panic notifier\n");
-			atomic_notifier_chain_unregister(&panic_notifier_list,
-							 &paniced);
 			unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 		}
 	}
@@ -1109,12 +1088,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 	dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 			info->node, info->fix.id);
 
-	/* Switch back to kernel console on panic */
-	/* multi card linked list maybe */
 	if (list_empty(&kernel_fb_helper_list)) {
-		dev_info(fb_helper->dev->dev, "registered panic notifier\n");
-		atomic_notifier_chain_register(&panic_notifier_list,
-					       &paniced);
 		register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 	}
 
-- 
cgit v1.2.3-70-g09d2


From 6295d607ad34ee4e43aab3f20714c2ef7a6adea1 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 9 Jul 2015 23:44:25 +0200
Subject: drm: Add modeset object iterators

And roll them out across drm_* files. The point here isn't code
prettification (it helps with that too) but that some of these lists
aren't static any more. And having macros will gives us a convenient
place to put locking checks into.

I didn't add an iterator for props since that's only used by a
list_for_each_entry_safe in the driver teardown code.

Search&replace was done with the below cocci spatch. Note that there's
a bunch more places that didn't match and which would need some manual
changes, but I've intentially left these out for this mostly automated
patch.

iterator name drm_for_each_crtc;
struct drm_crtc *crtc;
struct drm_device *dev;
expression head;
@@
- list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ drm_for_each_crtc (crtc, dev) {
...
}

@@
iterator name drm_for_each_encoder;
struct drm_encoder *encoder;
struct drm_device *dev;
expression head;
@@
- list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ drm_for_each_encoder (encoder, dev) {
...
}

@@
iterator name drm_for_each_fb;
struct drm_framebuffer *fb;
struct drm_device *dev;
expression head;
@@
- list_for_each_entry(fb, &dev->mode_config.fb_list, head) {
+ drm_for_each_fb (fb, dev) {
...
}

@@
iterator name drm_for_each_connector;
struct drm_connector *connector;
struct drm_device *dev;
expression head;
@@
- list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ drm_for_each_connector (connector, dev) {
...
}

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_crtc.c         | 21 ++++++++-------------
 drivers/gpu/drm/drm_crtc_helper.c  | 34 +++++++++++++++++-----------------
 drivers/gpu/drm/drm_fb_helper.c    | 10 +++++-----
 drivers/gpu/drm/drm_of.c           |  2 +-
 drivers/gpu/drm/drm_probe_helper.c |  6 +++---
 include/drm/drm_crtc.h             | 15 +++++++++++++++
 6 files changed, 49 insertions(+), 39 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 9c978d9de3b8..9b05dc76379e 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -615,7 +615,7 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
 	if (atomic_read(&fb->refcount.refcount) > 1) {
 		drm_modeset_lock_all(dev);
 		/* remove from any CRTC */
-		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+		drm_for_each_crtc(crtc, dev) {
 			if (crtc->primary->fb == fb) {
 				/* should turn off the crtc */
 				memset(&set, 0, sizeof(struct drm_mode_set));
@@ -627,7 +627,7 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
 			}
 		}
 
-		list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+		drm_for_each_plane(plane, dev) {
 			if (plane->fb == fb)
 				drm_plane_force_disable(plane);
 		}
@@ -1305,7 +1305,7 @@ drm_plane_from_index(struct drm_device *dev, int idx)
 	struct drm_plane *plane;
 	unsigned int i = 0;
 
-	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+	drm_for_each_plane(plane, dev) {
 		if (i == idx)
 			return plane;
 		i++;
@@ -1838,8 +1838,7 @@ int drm_mode_getresources(struct drm_device *dev, void *data,
 		copied = 0;
 		crtc_id = (uint32_t __user *)(unsigned long)card_res->crtc_id_ptr;
 		if (!mode_group) {
-			list_for_each_entry(crtc, &dev->mode_config.crtc_list,
-					    head) {
+			drm_for_each_crtc(crtc, dev) {
 				DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 				if (put_user(crtc->base.id, crtc_id + copied)) {
 					ret = -EFAULT;
@@ -1865,9 +1864,7 @@ int drm_mode_getresources(struct drm_device *dev, void *data,
 		copied = 0;
 		encoder_id = (uint32_t __user *)(unsigned long)card_res->encoder_id_ptr;
 		if (!mode_group) {
-			list_for_each_entry(encoder,
-					    &dev->mode_config.encoder_list,
-					    head) {
+			drm_for_each_encoder(encoder, dev) {
 				DRM_DEBUG_KMS("[ENCODER:%d:%s]\n", encoder->base.id,
 						encoder->name);
 				if (put_user(encoder->base.id, encoder_id +
@@ -1896,9 +1893,7 @@ int drm_mode_getresources(struct drm_device *dev, void *data,
 		copied = 0;
 		connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr;
 		if (!mode_group) {
-			list_for_each_entry(connector,
-					    &dev->mode_config.connector_list,
-					    head) {
+			drm_for_each_connector(connector, dev) {
 				DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 					connector->base.id,
 					connector->name);
@@ -2187,7 +2182,7 @@ static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
 
 	/* For atomic drivers only state objects are synchronously updated and
 	 * protected by modeset locks, so check those first. */
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		if (!connector->state)
 			continue;
 
@@ -5393,7 +5388,7 @@ void drm_mode_config_reset(struct drm_device *dev)
 		if (encoder->funcs->reset)
 			encoder->funcs->reset(encoder);
 
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		connector->status = connector_status_unknown;
 
 		if (connector->funcs->reset)
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 393114df88a3..30254fb249fe 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -180,7 +180,7 @@ static void __drm_helper_disable_unused_functions(struct drm_device *dev)
 
 	drm_warn_on_modeset_not_all_locked(dev);
 
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 		if (!drm_helper_encoder_in_use(encoder)) {
 			drm_encoder_disable(encoder);
 			/* disconnect encoder from any connector */
@@ -188,7 +188,7 @@ static void __drm_helper_disable_unused_functions(struct drm_device *dev)
 		}
 	}
 
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(crtc, dev) {
 		const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 		crtc->enabled = drm_helper_crtc_in_use(crtc);
 		if (!crtc->enabled) {
@@ -230,7 +230,7 @@ drm_crtc_prepare_encoders(struct drm_device *dev)
 	const struct drm_encoder_helper_funcs *encoder_funcs;
 	struct drm_encoder *encoder;
 
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 		encoder_funcs = encoder->helper_private;
 		/* Disable unused encoders */
 		if (encoder->crtc == NULL)
@@ -305,7 +305,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	 * adjust it according to limitations or connector properties, and also
 	 * a chance to reject the mode entirely.
 	 */
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 
 		if (encoder->crtc != crtc)
 			continue;
@@ -334,7 +334,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	crtc->hwmode = *adjusted_mode;
 
 	/* Prepare the encoders and CRTCs before setting the mode. */
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 
 		if (encoder->crtc != crtc)
 			continue;
@@ -359,7 +359,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	if (!ret)
 	    goto done;
 
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 
 		if (encoder->crtc != crtc)
 			continue;
@@ -376,7 +376,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	crtc_funcs->commit(crtc);
 
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 
 		if (encoder->crtc != crtc)
 			continue;
@@ -418,11 +418,11 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
 	struct drm_encoder *encoder;
 
 	/* Decouple all encoders and their attached connectors from this crtc */
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 		if (encoder->crtc != crtc)
 			continue;
 
-		list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		drm_for_each_connector(connector, dev) {
 			if (connector->encoder != encoder)
 				continue;
 
@@ -519,12 +519,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 	 * restored, not the drivers personal bookkeeping.
 	 */
 	count = 0;
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 		save_encoders[count++] = *encoder;
 	}
 
 	count = 0;
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		save_connectors[count++] = *connector;
 	}
 
@@ -562,7 +562,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 
 	/* a) traverse passed in connector list and get encoders for them */
 	count = 0;
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		const struct drm_connector_helper_funcs *connector_funcs =
 			connector->helper_private;
 		new_encoder = connector->encoder;
@@ -602,7 +602,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 	}
 
 	count = 0;
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		if (!connector->encoder)
 			continue;
 
@@ -685,12 +685,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 fail:
 	/* Restore all previous data. */
 	count = 0;
-	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+	drm_for_each_encoder(encoder, dev) {
 		*encoder = save_encoders[count++];
 	}
 
 	count = 0;
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		*connector = save_connectors[count++];
 	}
 
@@ -862,7 +862,7 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
 	bool ret;
 
 	drm_modeset_lock_all(dev);
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(crtc, dev) {
 
 		if (!crtc->enabled)
 			continue;
@@ -876,7 +876,7 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
 
 		/* Turn off outputs that were already powered off */
 		if (drm_helper_choose_crtc_dpms(crtc)) {
-			list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+			drm_for_each_encoder(encoder, dev) {
 
 				if(encoder->crtc != crtc)
 					continue;
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index cac422916c7a..3630d92c9738 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -98,7 +98,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 	struct drm_connector *connector;
 	int i;
 
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		struct drm_fb_helper_connector *fb_helper_connector;
 
 		fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
@@ -269,7 +269,7 @@ static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 	struct drm_device *dev = crtc->dev;
 	struct drm_crtc *c;
 
-	list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(c, dev) {
 		if (crtc->base.id == c->base.id)
 			return c->primary->fb;
 	}
@@ -321,7 +321,7 @@ static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 
 	drm_warn_on_modeset_not_all_locked(dev);
 
-	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+	drm_for_each_plane(plane, dev) {
 		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 			drm_plane_force_disable(plane);
 
@@ -458,7 +458,7 @@ static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 	if (dev->primary->master)
 		return false;
 
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(crtc, dev) {
 		if (crtc->primary->fb)
 			crtcs_bound++;
 		if (crtc->primary->fb == fb_helper->fb)
@@ -655,7 +655,7 @@ int drm_fb_helper_init(struct drm_device *dev,
 	}
 
 	i = 0;
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(crtc, dev) {
 		fb_helper->crtc_info[i].mode_set.crtc = crtc;
 		i++;
 	}
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index aaa130736bf8..be3884073ea4 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -19,7 +19,7 @@ static uint32_t drm_crtc_port_mask(struct drm_device *dev,
 	unsigned int index = 0;
 	struct drm_crtc *tmp;
 
-	list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
+	drm_for_each_crtc(tmp, dev) {
 		if (tmp->port == port)
 			return 1 << index;
 
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 04203c0d2ecb..64d85c1bd18b 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -312,7 +312,7 @@ static void output_poll_execute(struct work_struct *work)
 		goto out;
 
 	mutex_lock(&dev->mode_config.mutex);
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 
 		/* Ignore forced connectors. */
 		if (connector->force)
@@ -413,7 +413,7 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
 	if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
 		return;
 
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 		if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
 					 DRM_CONNECTOR_POLL_DISCONNECT))
 			poll = true;
@@ -495,7 +495,7 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
 		return false;
 
 	mutex_lock(&dev->mode_config.mutex);
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+	drm_for_each_connector(connector, dev) {
 
 		/* Only handle HPD capable connectors. */
 		if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 5cf0e6c3fc41..7c95a7df6065 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1583,4 +1583,19 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev,
 	list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \
 		if (plane->type == DRM_PLANE_TYPE_OVERLAY)
 
+#define drm_for_each_plane(plane, dev) \
+	list_for_each_entry(plane, &(dev)->mode_config.plane_list, head)
+
+#define drm_for_each_crtc(crtc, dev) \
+	list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
+
+#define drm_for_each_connector(connector, dev) \
+	list_for_each_entry(connector, &(dev)->mode_config.connector_list, head)
+
+#define drm_for_each_encoder(encoder, dev) \
+	list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)
+
+#define drm_for_each_fb(fb, dev) \
+	list_for_each_entry(fb, &(dev)->mode_config.fb_list, head)
+
 #endif /* __DRM_CRTC_H__ */
-- 
cgit v1.2.3-70-g09d2


From 169faecadd2444fc295c724c0a2f622b99e6bf19 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 9 Jul 2015 23:44:27 +0200
Subject: drm/fbdev-helper: Grab mode_config.mutex in
 drm_fb_helper_single_add_all_connectors

This is now truly only duct-tape to keep locking checks happy since
calling this function when hpd or polling are already enabled is a
bug. The fbdev helper can't cope with hotplug changes yet at this
point, only after that.

Otoh a bit more robustness in this function can't hurt, and with this
fbdev can actually cope with hotplug changes. And it's also more
consistent with the connector hotadd/remove dp mst needs to do.
Therefore document this as new official behavior.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 3630d92c9738..329d08167b77 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -89,8 +89,9 @@ static LIST_HEAD(kernel_fb_helper_list);
  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  * not adequate to be used for the fbcon.
  *
- * Since this is part of the initial setup before the fbdev is published, no
- * locking is required.
+ * This function is protected against concurrent connector hotadds/removals
+ * using drm_fb_helper_add_one_connector() and
+ * drm_fb_helper_remove_one_connector().
  */
 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 {
@@ -98,6 +99,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 	struct drm_connector *connector;
 	int i;
 
+	mutex_lock(&dev->mode_config.mutex);
 	drm_for_each_connector(connector, dev) {
 		struct drm_fb_helper_connector *fb_helper_connector;
 
@@ -108,6 +110,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 		fb_helper_connector->connector = connector;
 		fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 	}
+	mutex_unlock(&dev->mode_config.mutex);
 	return 0;
 fail:
 	for (i = 0; i < fb_helper->connector_count; i++) {
@@ -115,6 +118,8 @@ fail:
 		fb_helper->connector_info[i] = NULL;
 	}
 	fb_helper->connector_count = 0;
+	mutex_unlock(&dev->mode_config.mutex);
+
 	return -ENOMEM;
 }
 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
-- 
cgit v1.2.3-70-g09d2


From b8017d6c33be9862505a9154e302c4b00cbfca43 Mon Sep 17 00:00:00 2001
From: Archit Taneja <architt@codeaurora.org>
Date: Wed, 22 Jul 2015 14:57:56 +0530
Subject: drm/fb_helper: Add drm_fb_helper functions to manage fb_info creation

Every drm driver calls framebuffer_alloc, fb_alloc_cmap,
unregister_framebuffer, fb_dealloc_cmap and framebuffer_release in
order to emulate fbdev support.

Create drm_fb_helper functions that perform the above operations.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly. It also removes repetitive code from drivers.

There are some drivers that call alloc_apertures after framebuffer_alloc
and some that don't. Make the helper always call alloc_apertures. This
would make certain drivers allocate memory for apertures but not use
them. Since it's a small amount of memory, it shouldn't be an issue.

v2:
- Added kerneldocs
- Added a check for non-NULL fb_helper before proceeding. This will
  make the helpers work when we have a module param for fbdev emulation

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 80 +++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_fb_helper.h     |  4 +++
 2 files changed, 84 insertions(+)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 73f90f7e2f74..714c8af80180 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -654,6 +654,86 @@ out_free:
 }
 EXPORT_SYMBOL(drm_fb_helper_init);
 
+/**
+ * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
+ * @fb_helper: driver-allocated fbdev helper
+ *
+ * A helper to alloc fb_info and the members cmap and apertures. Called
+ * by the driver within the fb_probe fb_helper callback function.
+ *
+ * RETURNS:
+ * fb_info pointer if things went okay, pointer containing error code
+ * otherwise
+ */
+struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
+{
+	struct device *dev = fb_helper->dev->dev;
+	struct fb_info *info;
+	int ret;
+
+	info = framebuffer_alloc(0, dev);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+
+	ret = fb_alloc_cmap(&info->cmap, 256, 0);
+	if (ret)
+		goto err_release;
+
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures) {
+		ret = -ENOMEM;
+		goto err_free_cmap;
+	}
+
+	fb_helper->fbdev = info;
+
+	return info;
+
+err_free_cmap:
+	fb_dealloc_cmap(&info->cmap);
+err_release:
+	framebuffer_release(info);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
+
+/**
+ * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
+ * @fb_helper: driver-allocated fbdev helper
+ *
+ * A wrapper around unregister_framebuffer, to release the fb_info
+ * framebuffer device
+ */
+void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
+{
+	if (fb_helper && fb_helper->fbdev)
+		unregister_framebuffer(fb_helper->fbdev);
+}
+EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
+
+/**
+ * drm_fb_helper_release_fbi - dealloc fb_info and its members
+ * @fb_helper: driver-allocated fbdev helper
+ *
+ * A helper to free memory taken by fb_info and the members cmap and
+ * apertures
+ */
+void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
+{
+	if (fb_helper) {
+		struct fb_info *info = fb_helper->fbdev;
+
+		if (info) {
+			if (info->cmap.len)
+				fb_dealloc_cmap(&info->cmap);
+			framebuffer_release(info);
+		}
+
+		fb_helper->fbdev = NULL;
+	}
+}
+EXPORT_SYMBOL(drm_fb_helper_release_fbi);
+
 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 {
 	if (!list_empty(&fb_helper->kernel_fb_list)) {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 0dfd94def593..2ee4ec53efc1 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -136,6 +136,10 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 			    struct fb_info *info);
 
 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
+
+struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
+void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
+void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 			    uint32_t fb_width, uint32_t fb_height);
 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
-- 
cgit v1.2.3-70-g09d2


From 47074ab7951c1fcfc3ff637eb8401c3a71272057 Mon Sep 17 00:00:00 2001
From: Archit Taneja <architt@codeaurora.org>
Date: Wed, 22 Jul 2015 14:57:57 +0530
Subject: drm/fb_helper: Create a wrapper for unlink_framebuffer

Some drm drivers call unlink_framebuffer. Create a drm_fb_helper function
that wraps around these calls.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly, in order to make fbdev emulation a top level drm
option.

v2:
- Added kerneldocs
- Added a check for non-NULL fb_helper before proceeding. This will
  make the helpers work when we have a module param for fbdev emulation

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 13 +++++++++++++
 include/drm/drm_fb_helper.h     |  2 ++
 2 files changed, 15 insertions(+)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 714c8af80180..5383c3f7d0ec 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -748,6 +748,19 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 }
 EXPORT_SYMBOL(drm_fb_helper_fini);
 
+/**
+ * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
+ * @fb_helper: driver-allocated fbdev helper
+ *
+ * A wrapper around unlink_framebuffer implemented by fbdev core
+ */
+void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
+{
+	if (fb_helper && fb_helper->fbdev)
+		unlink_framebuffer(fb_helper->fbdev);
+}
+EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
+
 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 		     u16 blue, u16 regno, struct fb_info *info)
 {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 2ee4ec53efc1..4c908370a61e 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -145,6 +145,8 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 			    uint32_t depth);
 
+void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
+
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-- 
cgit v1.2.3-70-g09d2


From cbb1a82e5608fd6511940d27c231f0f4e2495b04 Mon Sep 17 00:00:00 2001
From: Archit Taneja <architt@codeaurora.org>
Date: Fri, 31 Jul 2015 16:21:41 +0530
Subject: drm/fb_helper: Create wrappers for fb_sys_read/write funcs

Some drm drivers populate their fb_ops with fb_sys_read/write fb sysfs
ops.

Create a drm_fb_helper function that wraps around these calls.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly, in order to make fbdev emulation a top level drm
option.

v3:
- Fix kerneldoc errors

v2:
- Added kerneldocs
- Follow the drm way of aligning of arguments in func definitions
- Remove unnecessary checks for non NULL fb_info

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/Kconfig         |  1 +
 drivers/gpu/drm/drm_fb_helper.c | 32 ++++++++++++++++++++++++++++++++
 include/drm/drm_fb_helper.h     |  5 +++++
 3 files changed, 38 insertions(+)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c46ca311d8c3..6ab503b387db 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -37,6 +37,7 @@ config DRM_KMS_FB_HELPER
 	select FB
 	select FRAMEBUFFER_CONSOLE if !EXPERT
 	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
+	select FB_SYS_FOPS
 	help
 	  FBDEV helpers for KMS drivers.
 
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 5383c3f7d0ec..39f3be2f37a2 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -761,6 +761,38 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 }
 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 
+/**
+ * drm_fb_helper_sys_read - wrapper around fb_sys_read
+ * @info: fb_info struct pointer
+ * @buf: userspace buffer to read from framebuffer memory
+ * @count: number of bytes to read from framebuffer memory
+ * @ppos: read offset within framebuffer memory
+ *
+ * A wrapper around fb_sys_read implemented by fbdev core
+ */
+ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	return fb_sys_read(info, buf, count, ppos);
+}
+EXPORT_SYMBOL(drm_fb_helper_sys_read);
+
+/**
+ * drm_fb_helper_sys_write - wrapper around fb_sys_write
+ * @info: fb_info struct pointer
+ * @buf: userspace buffer to write to framebuffer memory
+ * @count: number of bytes to write to framebuffer memory
+ * @ppos: write offset within framebuffer memory
+ *
+ * A wrapper around fb_sys_write implemented by fbdev core
+ */
+ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	return fb_sys_write(info, buf, count, ppos);
+}
+EXPORT_SYMBOL(drm_fb_helper_sys_write);
+
 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 		     u16 blue, u16 regno, struct fb_info *info)
 {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 4c908370a61e..fc123685baf4 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -147,6 +147,11 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 
 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
 
+ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
+			       size_t count, loff_t *ppos);
+ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
+				size_t count, loff_t *ppos);
+
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-- 
cgit v1.2.3-70-g09d2


From 742547b73d27e7bce2d0dd0f1b95692436f30950 Mon Sep 17 00:00:00 2001
From: Archit Taneja <architt@codeaurora.org>
Date: Fri, 31 Jul 2015 16:21:42 +0530
Subject: drm/fb_helper: Create wrappers for blit, copyarea and fillrect funcs

drm drivers that emulate fbdev populate their fb_fillrect, fb_copyarea
and fb_imageblit fb_ops with the help of cfb_* or sys_* fbdev core
helper functions.

Create drm_fb_helper functions that wrap around these calls.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly, in order to make fbdev emulation a top level drm
option.

v3:
- Fixed kerneldoc errors

v2:
- Added kerneldocs
- Follow the drm way of aligning of arguments in func definitions
- Remove unnecessary checks for non NULL fb_info

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/Kconfig         |  6 +++
 drivers/gpu/drm/drm_fb_helper.c | 84 +++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_fb_helper.h     | 14 +++++++
 3 files changed, 104 insertions(+)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 6ab503b387db..35a8c0bf360f 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -38,6 +38,12 @@ config DRM_KMS_FB_HELPER
 	select FRAMEBUFFER_CONSOLE if !EXPERT
 	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
 	select FB_SYS_FOPS
+	select FB_SYS_FILLRECT
+	select FB_SYS_COPYAREA
+	select FB_SYS_IMAGEBLIT
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
 	help
 	  FBDEV helpers for KMS drivers.
 
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 39f3be2f37a2..e63350114c06 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -793,6 +793,90 @@ ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 }
 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 
+/**
+ * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
+ * @info: fbdev registered by the helper
+ * @rect: info about rectangle to fill
+ *
+ * A wrapper around sys_fillrect implemented by fbdev core
+ */
+void drm_fb_helper_sys_fillrect(struct fb_info *info,
+				const struct fb_fillrect *rect)
+{
+	sys_fillrect(info, rect);
+}
+EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
+
+/**
+ * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
+ * @info: fbdev registered by the helper
+ * @area: info about area to copy
+ *
+ * A wrapper around sys_copyarea implemented by fbdev core
+ */
+void drm_fb_helper_sys_copyarea(struct fb_info *info,
+				const struct fb_copyarea *area)
+{
+	sys_copyarea(info, area);
+}
+EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
+
+/**
+ * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
+ * @info: fbdev registered by the helper
+ * @image: info about image to blit
+ *
+ * A wrapper around sys_imageblit implemented by fbdev core
+ */
+void drm_fb_helper_sys_imageblit(struct fb_info *info,
+				 const struct fb_image *image)
+{
+	sys_imageblit(info, image);
+}
+EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
+
+/**
+ * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
+ * @info: fbdev registered by the helper
+ * @rect: info about rectangle to fill
+ *
+ * A wrapper around cfb_imageblit implemented by fbdev core
+ */
+void drm_fb_helper_cfb_fillrect(struct fb_info *info,
+				const struct fb_fillrect *rect)
+{
+	cfb_fillrect(info, rect);
+}
+EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
+
+/**
+ * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
+ * @info: fbdev registered by the helper
+ * @area: info about area to copy
+ *
+ * A wrapper around cfb_copyarea implemented by fbdev core
+ */
+void drm_fb_helper_cfb_copyarea(struct fb_info *info,
+				const struct fb_copyarea *area)
+{
+	cfb_copyarea(info, area);
+}
+EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
+
+/**
+ * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
+ * @info: fbdev registered by the helper
+ * @image: info about image to blit
+ *
+ * A wrapper around cfb_imageblit implemented by fbdev core
+ */
+void drm_fb_helper_cfb_imageblit(struct fb_info *info,
+				 const struct fb_image *image)
+{
+	cfb_imageblit(info, image);
+}
+EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
+
 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 		     u16 blue, u16 regno, struct fb_info *info)
 {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index fc123685baf4..180290e62918 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -152,6 +152,20 @@ ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 				size_t count, loff_t *ppos);
 
+void drm_fb_helper_sys_fillrect(struct fb_info *info,
+				const struct fb_fillrect *rect);
+void drm_fb_helper_sys_copyarea(struct fb_info *info,
+				const struct fb_copyarea *area);
+void drm_fb_helper_sys_imageblit(struct fb_info *info,
+				 const struct fb_image *image);
+
+void drm_fb_helper_cfb_fillrect(struct fb_info *info,
+				const struct fb_fillrect *rect);
+void drm_fb_helper_cfb_copyarea(struct fb_info *info,
+				const struct fb_copyarea *area);
+void drm_fb_helper_cfb_imageblit(struct fb_info *info,
+				 const struct fb_image *image);
+
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-- 
cgit v1.2.3-70-g09d2


From fdefa58a5097b397ce2d3f6b6f8caa14aacfb70d Mon Sep 17 00:00:00 2001
From: Archit Taneja <architt@codeaurora.org>
Date: Fri, 31 Jul 2015 16:21:43 +0530
Subject: drm/fb_helper: Create a wrapper for fb_set_suspend

Some drm drivers call fb_set_suspend. Create a drm_fb_helper function
that wraps around these calls.

This is part of an effort to prevent drm drivers from calling fbdev
functions directly, in order to make fbdev emulation a top level drm
option.

v3:
- Fixed kerneldoc errors

v2:
- Added kerneldocs
- Added a check for non-NULL fb_helper before proceeding. This will
  make the helpers work when we have a module param for fbdev emulation
- Follow the drm way of aligning of arguments in func definitions

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 14 ++++++++++++++
 include/drm/drm_fb_helper.h     |  2 ++
 2 files changed, 16 insertions(+)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index e63350114c06..c1cb7537a18f 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -877,6 +877,20 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 }
 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 
+/**
+ * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
+ * @fb_helper: driver-allocated fbdev helper
+ * @state: desired state, zero to resume, non-zero to suspend
+ *
+ * A wrapper around fb_set_suspend implemented by fbdev core
+ */
+void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
+{
+	if (fb_helper && fb_helper->fbdev)
+		fb_set_suspend(fb_helper->fbdev, state);
+}
+EXPORT_SYMBOL(drm_fb_helper_set_suspend);
+
 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 		     u16 blue, u16 regno, struct fb_info *info)
 {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 180290e62918..ef32500e07fc 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -166,6 +166,8 @@ void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 				 const struct fb_image *image);
 
+void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state);
+
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
-- 
cgit v1.2.3-70-g09d2


From c50bfd08d60cefbe1714c4a53b1c325982858549 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 28 Jul 2015 13:18:40 +0200
Subject: drm/fbdev: Return -EBUSY when oopsing

Trying to do anything with kms drivers when oopsing has become a
failing proposition. But since we can end up in the fbdev code simply
due to the console unblanking that's done unconditionally just
removing our panic handler isn't enough. We need to block all fbdev
callbacks when oopsing.

There was already one in the blank handler, but it failed silently.
That makes it impossible for drivers (like i915) who subclass these
functions to figure this out.

Instead consistently return -EBUSY so that everyone knows that we
really don't want to be bothered right now. This also allows us to
remove a pile of FIXMEs from the i915 fbdev code (since due to the
failure code they now won't attempt to grab dangerous locks any more).

Cc: Dave Airlie <airlied@gmail.com>
Cc: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c    | 24 ++++++++++++------------
 drivers/gpu/drm/i915/intel_fbdev.c | 21 ---------------------
 2 files changed, 12 insertions(+), 33 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index c1cb7537a18f..f16eed0489f8 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -490,14 +490,6 @@ static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 	struct drm_connector *connector;
 	int i, j;
 
-	/*
-	 * fbdev->blank can be called from irq context in case of a panic.
-	 * Since we already have our own special panic handler which will
-	 * restore the fbdev console mode completely, just bail out early.
-	 */
-	if (oops_in_progress)
-		return;
-
 	/*
 	 * For each CRTC in this fb, turn the connectors on/off.
 	 */
@@ -531,6 +523,9 @@ static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
  */
 int drm_fb_helper_blank(int blank, struct fb_info *info)
 {
+	if (oops_in_progress)
+		return -EBUSY;
+
 	switch (blank) {
 	/* Display: On; HSync: On, VSync: On */
 	case FB_BLANK_UNBLANK:
@@ -978,9 +973,10 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 	int i, j, rc = 0;
 	int start;
 
-	if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
+	if (oops_in_progress)
 		return -EBUSY;
-	}
+
+	drm_modeset_lock_all(dev);
 	if (!drm_fb_helper_is_bound(fb_helper)) {
 		drm_modeset_unlock_all(dev);
 		return -EBUSY;
@@ -1129,6 +1125,9 @@ int drm_fb_helper_set_par(struct fb_info *info)
 	struct drm_fb_helper *fb_helper = info->par;
 	struct fb_var_screeninfo *var = &info->var;
 
+	if (oops_in_progress)
+		return -EBUSY;
+
 	if (var->pixclock != 0) {
 		DRM_ERROR("PIXEL CLOCK SET\n");
 		return -EINVAL;
@@ -1154,9 +1153,10 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 	int ret = 0;
 	int i;
 
-	if (__drm_modeset_lock_all(dev, !!oops_in_progress)) {
+	if (oops_in_progress)
 		return -EBUSY;
-	}
+
+	drm_modeset_lock_all(dev);
 	if (!drm_fb_helper_is_bound(fb_helper)) {
 		drm_modeset_unlock_all(dev);
 		return -EBUSY;
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 7eff33ff84f6..f786c9b8927e 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -55,13 +55,6 @@ static int intel_fbdev_set_par(struct fb_info *info)
 	ret = drm_fb_helper_set_par(info);
 
 	if (ret == 0) {
-		/*
-		 * FIXME: fbdev presumes that all callbacks also work from
-		 * atomic contexts and relies on that for emergency oops
-		 * printing. KMS totally doesn't do that and the locking here is
-		 * by far not the only place this goes wrong.  Ignore this for
-		 * now until we solve this for real.
-		 */
 		mutex_lock(&fb_helper->dev->struct_mutex);
 		intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 		mutex_unlock(&fb_helper->dev->struct_mutex);
@@ -80,13 +73,6 @@ static int intel_fbdev_blank(int blank, struct fb_info *info)
 	ret = drm_fb_helper_blank(blank, info);
 
 	if (ret == 0) {
-		/*
-		 * FIXME: fbdev presumes that all callbacks also work from
-		 * atomic contexts and relies on that for emergency oops
-		 * printing. KMS totally doesn't do that and the locking here is
-		 * by far not the only place this goes wrong.  Ignore this for
-		 * now until we solve this for real.
-		 */
 		mutex_lock(&fb_helper->dev->struct_mutex);
 		intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 		mutex_unlock(&fb_helper->dev->struct_mutex);
@@ -106,13 +92,6 @@ static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 	ret = drm_fb_helper_pan_display(var, info);
 
 	if (ret == 0) {
-		/*
-		 * FIXME: fbdev presumes that all callbacks also work from
-		 * atomic contexts and relies on that for emergency oops
-		 * printing. KMS totally doesn't do that and the locking here is
-		 * by far not the only place this goes wrong.  Ignore this for
-		 * now until we solve this for real.
-		 */
 		mutex_lock(&fb_helper->dev->struct_mutex);
 		intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 		mutex_unlock(&fb_helper->dev->struct_mutex);
-- 
cgit v1.2.3-70-g09d2


From dd908c864d9a8347216291b4b61074777458373a Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 28 Jul 2015 13:18:41 +0200
Subject: drm/fb-helper: Stop using trylocks in force_restore

Since the panic handling is gone this is only used for force-restoring
the fbdev/fbcon from sysrq, and that's done with a work item. No need
any more to do trylocks, we can just do normal locking.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index f16eed0489f8..e4bbb5309602 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -416,19 +416,10 @@ static bool drm_fb_helper_force_kernel_mode(void)
 		if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 			continue;
 
-		/*
-		 * NOTE: Use trylock mode to avoid deadlocks and sleeping in
-		 * panic context.
-		 */
-		if (__drm_modeset_lock_all(dev, true) != 0) {
-			error = true;
-			continue;
-		}
-
+		drm_modeset_lock_all(dev);
 		ret = drm_fb_helper_restore_fbdev_mode(helper);
 		if (ret)
 			error = true;
-
 		drm_modeset_unlock_all(dev);
 	}
 	return error;
-- 
cgit v1.2.3-70-g09d2


From 3d9e35a92e935e1f968e79f0e0b72ce4b9f14c3e Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Tue, 4 Aug 2015 15:22:10 +0200
Subject: drm/fb-helper: Clarify drm_fb_helper_restore_fbdev_mode*()

As of commit 5ea1f752ae04be40 ("drm: add
drm_fb_helper_restore_fbdev_mode_unlocked()"),
drm_fb_helper_restore_fbdev_mode() is no longer public, and drivers
should call drm_fb_helper_restore_fbdev_mode_unlocked() from their
->lastclose callbacks instead.

Update the documentation to reflect this, and absorb the one liner
drm_fb_helper_restore_fbdev_mode() into its single caller.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index e4bbb5309602..7278c23ea98b 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -56,8 +56,8 @@ static LIST_HEAD(kernel_fb_helper_list);
  * Teardown is done with drm_fb_helper_fini().
  *
  * At runtime drivers should restore the fbdev console by calling
- * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
- * should also notify the fb helper code from updates to the output
+ * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
+ * They should also notify the fb helper code from updates to the output
  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  * integration with the output polling code in drm_crtc_helper.c the modeset
  * code provides a ->output_poll_changed callback.
@@ -354,21 +354,6 @@ static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 	}
 	return error;
 }
-/**
- * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
- * @fb_helper: fbcon to restore
- *
- * This should be called from driver's drm ->lastclose callback
- * when implementing an fbcon on top of kms using this helper. This ensures that
- * the user isn't greeted with a black screen when e.g. X dies.
- *
- * Use this variant if you need to bypass locking (panic), or already
- * hold all modeset locks.  Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked()
- */
-static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
-{
-	return restore_fbdev_mode(fb_helper);
-}
 
 /**
  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
@@ -417,7 +402,7 @@ static bool drm_fb_helper_force_kernel_mode(void)
 			continue;
 
 		drm_modeset_lock_all(dev);
-		ret = drm_fb_helper_restore_fbdev_mode(helper);
+		ret = restore_fbdev_mode(helper);
 		if (ret)
 			error = true;
 		drm_modeset_unlock_all(dev);
-- 
cgit v1.2.3-70-g09d2


From 2c4124fdeaea4b70120da3bddf90c4587e65bbc6 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Tue, 4 Aug 2015 15:22:11 +0200
Subject: drm/fb-helper: Move drm_fb_helper_force_kernel_mode() inside #ifdef

If CONFIG_MAGIC_SYSRQ is not set:

    drivers/gpu/drm/drm_fb_helper.c:390:13: warning: 'drm_fb_helper_force_kernel_mode' defined but not used [-Wunused-function]
     static bool drm_fb_helper_force_kernel_mode(void)
		 ^

Move drm_fb_helper_force_kernel_mode() inside the existing #ifdef to fix
this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 50 ++++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7278c23ea98b..5875059a7625 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -383,6 +383,31 @@ bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 }
 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 
+static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
+{
+	struct drm_device *dev = fb_helper->dev;
+	struct drm_crtc *crtc;
+	int bound = 0, crtcs_bound = 0;
+
+	/* Sometimes user space wants everything disabled, so don't steal the
+	 * display if there's a master. */
+	if (dev->primary->master)
+		return false;
+
+	drm_for_each_crtc(crtc, dev) {
+		if (crtc->primary->fb)
+			crtcs_bound++;
+		if (crtc->primary->fb == fb_helper->fb)
+			bound++;
+	}
+
+	if (bound < crtcs_bound)
+		return false;
+
+	return true;
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
 /*
  * restore fbcon display for all kms driver's using this helper, used for sysrq
  * and panic handling.
@@ -410,31 +435,6 @@ static bool drm_fb_helper_force_kernel_mode(void)
 	return error;
 }
 
-static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
-{
-	struct drm_device *dev = fb_helper->dev;
-	struct drm_crtc *crtc;
-	int bound = 0, crtcs_bound = 0;
-
-	/* Sometimes user space wants everything disabled, so don't steal the
-	 * display if there's a master. */
-	if (dev->primary->master)
-		return false;
-
-	drm_for_each_crtc(crtc, dev) {
-		if (crtc->primary->fb)
-			crtcs_bound++;
-		if (crtc->primary->fb == fb_helper->fb)
-			bound++;
-	}
-
-	if (bound < crtcs_bound)
-		return false;
-
-	return true;
-}
-
-#ifdef CONFIG_MAGIC_SYSRQ
 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 {
 	bool ret;
-- 
cgit v1.2.3-70-g09d2


From cebbb7396b4493cf72e832cb2aa06f42b1957c7c Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Tue, 11 Aug 2015 09:54:59 +0200
Subject: drm/core: Set mode to NULL when connectors in a set drops to 0.

Without this when a MST connector is removed drm_atomic_helper_set_config
can complain about set->mode && !set->num_connectors.

------------[ cut here ]------------
WARNING: CPU: 2 PID: 2403 at drivers/gpu/drm/drm_atomic_helper.c:1673 drm_atomic_helper_set_config+0x22e/0x420()
CPU: 2 PID: 2403 Comm: kms_flip Not tainted 4.2.0-rc5 #4233
Hardware name: NUC5i7RYB, BIOS RYBDWi35.86A.0246.2015.0309.1355 03/09/2015
 ffffffff81ac75e8 ffff88004e4ffbf8 ffffffff81714c34 0000000080000000
 0000000000000000 ffff88004e4ffc38 ffffffff8107bf81 ffff88004e4ffc48
 ffff8800d8ca0690 ffff8800d8d7a080 ffff8800d8cc2290 ffff8800d07bc9f0
Call Trace:
 [<ffffffff81714c34>] dump_stack+0x4f/0x7b
 [<ffffffff8107bf81>] warn_slowpath_common+0x81/0xc0
 [<ffffffff8107c065>] warn_slowpath_null+0x15/0x20
 [<ffffffff813d9e3e>] drm_atomic_helper_set_config+0x22e/0x420
 [<ffffffff813da174>] ? drm_atomic_helper_plane_set_property+0x84/0xc0
 [<ffffffff813ee101>] drm_mode_set_config_internal+0x61/0x100
 [<ffffffff813dc4ed>] restore_fbdev_mode+0xbd/0xe0
 [<ffffffff813de1e4>] drm_fb_helper_restore_fbdev_mode_unlocked+0x24/0x70
 [<ffffffffc0123d11>] intel_fbdev_restore_mode+0x21/0x80 [i915]
 [<ffffffffc014bf69>] i915_driver_lastclose+0x9/0x10 [i915]
 [<ffffffff813e2429>] drm_lastclose+0x29/0x130
 [<ffffffff813e2844>] drm_release+0x314/0x500
 [<ffffffff81194795>] __fput+0xe5/0x1f0
 [<ffffffff811948d9>] ____fput+0x9/0x10
 [<ffffffff810968d8>] task_work_run+0x88/0xb0
 [<ffffffff8107d53f>] do_exit+0x37f/0xa90
 [<ffffffff8127e258>] ? selinux_file_ioctl+0x48/0xc0
 [<ffffffff81277dfe>] ? security_file_ioctl+0x3e/0x60
 [<ffffffff8107ec80>] do_group_exit+0x40/0xa0
 [<ffffffff8107ecef>] SyS_exit_group+0xf/0x10
 [<ffffffff8171bdd7>] entry_SYSCALL_64_fastpath+0x12/0x6a
---[ end trace 0daf358c49351567 ]---

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_fb_helper.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'drivers/gpu/drm/drm_fb_helper.c')

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 5875059a7625..418d299f3b12 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -168,11 +168,14 @@ static void remove_from_modeset(struct drm_mode_set *set,
 	}
 	set->num_connectors--;
 
-	/* because i915 is pissy about this..
+	/*
 	 * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 	 */
-	if (set->num_connectors == 0)
+	if (set->num_connectors == 0) {
 		set->fb = NULL;
+		drm_mode_destroy(connector->dev, set->mode);
+		set->mode = NULL;
+	}
 }
 
 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
-- 
cgit v1.2.3-70-g09d2