From 4ea50e99bd3501aea394aa7a9e9bd3115faabf37 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:44:24 +0200 Subject: drm: Simplify drm_for_each_legacy_plane arguments No need to pass the planelist when everyone just uses dev->mode_config.plane_list anyway. I want to add a pile more of iterators with unified (obj, dev) arguments. This is just prep. Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- include/drm/drm_crtc.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 57ca8cc383a6..5cf0e6c3fc41 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1579,8 +1579,8 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev, } /* Plane list iterator for legacy (overlay only) planes. */ -#define drm_for_each_legacy_plane(plane, planelist) \ - list_for_each_entry(plane, planelist, head) \ +#define drm_for_each_legacy_plane(plane, dev) \ + list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \ if (plane->type == DRM_PLANE_TYPE_OVERLAY) #endif /* __DRM_CRTC_H__ */ -- cgit v1.2.3 From 6295d607ad34ee4e43aab3f20714c2ef7a6adea1 Mon Sep 17 00:00:00 2001 From: Daniel Vetter 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 Signed-off-by: Daniel Vetter --- include/drm/drm_crtc.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include') 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 From 7a3f3d6667f5f9ffd1517f6b21d64bbf5312042c Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:44:28 +0200 Subject: drm: Check locking in drm_for_each_connector Because of DP MST connectors can now be hotplugged and we must hold the right lock when walking the connector lists. Enforce this by checking the locking in our shiny new list walking macros. v2: Extract the locking check into a small static inline helper to help readability. This will be more important when we make the read list access rules more complicated in later patches. Inspired by comments from Chris. Unfortunately, due to header loops around the definition of struct drm_device the function interface is a bit funny. v3: Encoders aren't hotadded/removed. For each dp mst encoder we statically create one fake encoder per pipe so that we can support as many mst sinks as the hw can (Dave). Cc: Chris Wilson Cc: Dave Airlie Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- include/drm/drm_crtc.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 7c95a7df6065..499562274353 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1589,8 +1589,18 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev, #define drm_for_each_crtc(crtc, dev) \ list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head) +static inline void +assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config) +{ + WARN_ON(!mutex_is_locked(&mode_config->mutex)); +} + #define drm_for_each_connector(connector, dev) \ - list_for_each_entry(connector, &(dev)->mode_config.connector_list, head) + for (assert_drm_connector_list_read_locked(&(dev)->mode_config), \ + connector = list_first_entry(&(dev)->mode_config.connector_list, \ + struct drm_connector, head); \ + &connector->head != (&(dev)->mode_config.connector_list); \ + connector = list_next_entry(connector, head)) #define drm_for_each_encoder(encoder, dev) \ list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head) -- cgit v1.2.3 From 4676ba0be756b2b02b9737147713d458042962f7 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:44:30 +0200 Subject: drm: Check locking in drm_for_each_fb Ever since framebuffers are reference counted we have a special lock for the global fb list. Make sure users of that list do hold that lock when using the new iterators. Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- include/drm/drm_crtc.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 499562274353..10547be5684a 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1606,6 +1606,10 @@ assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config) 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) + for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ + fb = list_first_entry(&(dev)->mode_config.fb_list, \ + struct drm_framebuffer, head); \ + &fb->head != (&(dev)->mode_config.fb_list); \ + fb = list_next_entry(fb, head)) #endif /* __DRM_CRTC_H__ */ -- cgit v1.2.3 From cff20ba2758d6b82978be5b1f40536bfc121af88 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:44:33 +0200 Subject: drm: Amend connector list locking rules Now that dp mst hotplug takes all locks we can amend the locking rules for the iterators. This is needed before we can roll these out in the atomic code to avoid getting burried in WARNINGs. v2: Rebase onto the extracted list locking assert and add a comment to explain the rules. v3: Fixup German->English translation fail in the comment. Cc: Chris Wilson Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- include/drm/drm_crtc.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 10547be5684a..fe3100115a41 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1592,7 +1592,15 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev, static inline void assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config) { - WARN_ON(!mutex_is_locked(&mode_config->mutex)); + /* + * The connector hotadd/remove code currently grabs both locks when + * updating lists. Hence readers need only hold either of them to be + * safe and the check amounts to + * + * WARN_ON(not_holding(A) && not_holding(B)). + */ + WARN_ON(!mutex_is_locked(&mode_config->mutex) && + !drm_modeset_is_locked(&mode_config->connection_mutex)); } #define drm_for_each_connector(connector, dev) \ -- cgit v1.2.3 From 3fdefa399e4644399ce3e74e65a75122d52dba6a Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:44:37 +0200 Subject: drm: gc now dead mode_group code Two nice things here: - drm_dev_register will truly register everything in the right order if the driver doesn't have a ->load callback. Before this we had to init the primary mode_group after the device nodes where already registered. - Less things to keep track of when reworking the connector locking, yay! Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- include/drm/drmP.h | 1 - include/drm/drm_crtc.h | 26 -------------------------- 2 files changed, 27 deletions(-) (limited to 'include') diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 48db6a56975f..c89351ede92c 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -675,7 +675,6 @@ struct drm_minor { /* currently active master for this node. Protected by master_mutex */ struct drm_master *master; - struct drm_mode_group mode_group; }; diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index fe3100115a41..3071319ea194 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1017,29 +1017,6 @@ struct drm_mode_config_funcs { void (*atomic_state_free)(struct drm_atomic_state *state); }; -/** - * struct drm_mode_group - group of mode setting resources for potential sub-grouping - * @num_crtcs: CRTC count - * @num_encoders: encoder count - * @num_connectors: connector count - * @num_bridges: bridge count - * @id_list: list of KMS object IDs in this group - * - * Currently this simply tracks the global mode setting state. But in the - * future it could allow groups of objects to be set aside into independent - * control groups for use by different user level processes (e.g. two X servers - * running simultaneously on different heads, each with their own mode - * configuration and freedom of mode setting). - */ -struct drm_mode_group { - uint32_t num_crtcs; - uint32_t num_encoders; - uint32_t num_connectors; - - /* list of object IDs for this group */ - uint32_t *id_list; -}; - /** * struct drm_mode_config - Mode configuration control structure * @mutex: mutex protecting KMS related lists and structures @@ -1324,9 +1301,6 @@ extern const char *drm_get_tv_select_name(int val); extern void drm_fb_release(struct drm_file *file_priv); extern void drm_property_destroy_user_blobs(struct drm_device *dev, struct drm_file *file_priv); -extern int drm_mode_group_init_legacy_group(struct drm_device *dev, struct drm_mode_group *group); -extern void drm_mode_group_destroy(struct drm_mode_group *group); -extern void drm_reinit_primary_mode_group(struct drm_device *dev); extern bool drm_probe_ddc(struct i2c_adapter *adapter); extern struct edid *drm_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter); -- cgit v1.2.3