diff options
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 14 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_connector.c | 116 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_encoder.c | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_mode_config.c | 34 | ||||
| -rw-r--r-- | include/drm/drm_connector.h | 38 | ||||
| -rw-r--r-- | include/drm/drm_mode_config.h | 12 |
6 files changed, 177 insertions, 43 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index ff38592134f5..b1b54011a92c 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1417,6 +1417,7 @@ drm_atomic_add_affected_connectors(struct drm_atomic_state *state, struct drm_mode_config *config = &state->dev->mode_config; struct drm_connector *connector; struct drm_connector_state *conn_state; + struct drm_connector_list_iter conn_iter; int ret; ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); @@ -1430,14 +1431,18 @@ drm_atomic_add_affected_connectors(struct drm_atomic_state *state, * Changed connectors are already in @state, so only need to look at the * current configuration. */ - drm_for_each_connector(connector, state->dev) { + drm_connector_list_iter_get(state->dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { if (connector->state->crtc != crtc) continue; conn_state = drm_atomic_get_connector_state(state, connector); - if (IS_ERR(conn_state)) + if (IS_ERR(conn_state)) { + drm_connector_list_iter_put(&conn_iter); return PTR_ERR(conn_state); + } } + drm_connector_list_iter_put(&conn_iter); return 0; } @@ -1692,6 +1697,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p) struct drm_plane *plane; struct drm_crtc *crtc; struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) return; @@ -1702,8 +1708,10 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p) list_for_each_entry(crtc, &config->crtc_list, head) drm_atomic_crtc_print_state(p, crtc->state); - list_for_each_entry(connector, &config->connector_list, head) + drm_connector_list_iter_get(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) drm_atomic_connector_print_state(p, connector->state); + drm_connector_list_iter_put(&conn_iter); } EXPORT_SYMBOL(drm_state_dump); diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 40f8126a9738..020225809ff4 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -190,13 +190,11 @@ int drm_connector_init(struct drm_device *dev, struct ida *connector_ida = &drm_connector_enum_list[connector_type].ida; - drm_modeset_lock_all(dev); - ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false, drm_connector_free); if (ret) - goto out_unlock; + return ret; connector->base.properties = &connector->properties; connector->dev = dev; @@ -233,8 +231,10 @@ int drm_connector_init(struct drm_device *dev, /* We should add connectors at the end to avoid upsetting the connector * index too much. */ + spin_lock_irq(&config->connector_list_lock); list_add_tail(&connector->head, &config->connector_list); config->num_connector++; + spin_unlock_irq(&config->connector_list_lock); if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL) drm_object_attach_property(&connector->base, @@ -259,9 +259,6 @@ out_put: if (ret) drm_mode_object_unregister(dev, &connector->base); -out_unlock: - drm_modeset_unlock_all(dev); - return ret; } EXPORT_SYMBOL(drm_connector_init); @@ -352,8 +349,10 @@ void drm_connector_cleanup(struct drm_connector *connector) drm_mode_object_unregister(dev, &connector->base); kfree(connector->name); connector->name = NULL; + spin_lock_irq(&dev->mode_config.connector_list_lock); list_del(&connector->head); dev->mode_config.num_connector--; + spin_unlock_irq(&dev->mode_config.connector_list_lock); WARN_ON(connector->state && !connector->funcs->atomic_destroy_state); if (connector->state && connector->funcs->atomic_destroy_state) @@ -432,30 +431,30 @@ EXPORT_SYMBOL(drm_connector_unregister); void drm_connector_unregister_all(struct drm_device *dev) { struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; - /* FIXME: taking the mode config mutex ends up in a clash with sysfs */ - list_for_each_entry(connector, &dev->mode_config.connector_list, head) + drm_connector_list_iter_get(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) drm_connector_unregister(connector); + drm_connector_list_iter_put(&conn_iter); } int drm_connector_register_all(struct drm_device *dev) { struct drm_connector *connector; - int ret; + struct drm_connector_list_iter conn_iter; + int ret = 0; - /* FIXME: taking the mode config mutex ends up in a clash with - * fbcon/backlight registration */ - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_get(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { ret = drm_connector_register(connector); if (ret) - goto err; + break; } + drm_connector_list_iter_put(&conn_iter); - return 0; - -err: - mutex_unlock(&dev->mode_config.mutex); - drm_connector_unregister_all(dev); + if (ret) + drm_connector_unregister_all(dev); return ret; } @@ -477,6 +476,87 @@ const char *drm_get_connector_status_name(enum drm_connector_status status) } EXPORT_SYMBOL(drm_get_connector_status_name); +#ifdef CONFIG_LOCKDEP +static struct lockdep_map connector_list_iter_dep_map = { + .name = "drm_connector_list_iter" +}; +#endif + +/** + * drm_connector_list_iter_get - initialize a connector_list iterator + * @dev: DRM device + * @iter: connector_list iterator + * + * Sets @iter up to walk the connector list in &drm_mode_config of @dev. @iter + * must always be cleaned up again by calling drm_connector_list_iter_put(). + * Iteration itself happens using drm_connector_list_iter_next() or + * drm_for_each_connector_iter(). + */ +void drm_connector_list_iter_get(struct drm_device *dev, + struct drm_connector_list_iter *iter) +{ + iter->dev = dev; + iter->conn = NULL; + lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_); +} +EXPORT_SYMBOL(drm_connector_list_iter_get); + +/** + * drm_connector_list_iter_next - return next connector + * @iter: connectr_list iterator + * + * Returns the next connector for @iter, or NULL when the list walk has + * completed. + */ +struct drm_connector * +drm_connector_list_iter_next(struct drm_connector_list_iter *iter) +{ + struct drm_connector *old_conn = iter->conn; + struct drm_mode_config *config = &iter->dev->mode_config; + struct list_head *lhead; + unsigned long flags; + + spin_lock_irqsave(&config->connector_list_lock, flags); + lhead = old_conn ? &old_conn->head : &config->connector_list; + + do { + if (lhead->next == &config->connector_list) { + iter->conn = NULL; + break; + } + + lhead = lhead->next; + iter->conn = list_entry(lhead, struct drm_connector, head); + + /* loop until it's not a zombie connector */ + } while (!kref_get_unless_zero(&iter->conn->base.refcount)); + spin_unlock_irqrestore(&config->connector_list_lock, flags); + + if (old_conn) + drm_connector_unreference(old_conn); + + return iter->conn; +} +EXPORT_SYMBOL(drm_connector_list_iter_next); + +/** + * drm_connector_list_iter_put - tear down a connector_list iterator + * @iter: connector_list iterator + * + * Tears down @iter and releases any resources (like &drm_connector references) + * acquired while walking the list. This must always be called, both when the + * iteration completes fully or when it was aborted without walking the entire + * list. + */ +void drm_connector_list_iter_put(struct drm_connector_list_iter *iter) +{ + iter->dev = NULL; + if (iter->conn) + drm_connector_unreference(iter->conn); + lock_release(&connector_list_iter_dep_map, 0, _RET_IP_); +} +EXPORT_SYMBOL(drm_connector_list_iter_put); + static const struct drm_prop_enum_list drm_subpixel_enum_list[] = { { SubPixelUnknown, "Unknown" }, { SubPixelHorizontalRGB, "Horizontal RGB" }, diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index 5dde3c6b1467..5f0598e4bf6f 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -184,10 +184,12 @@ static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder) struct drm_connector *connector; struct drm_device *dev = encoder->dev; bool uses_atomic = false; + struct drm_connector_list_iter conn_iter; /* For atomic drivers only state objects are synchronously updated and * protected by modeset locks, so check those first. */ - drm_for_each_connector(connector, dev) { + drm_connector_list_iter_get(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { if (!connector->state) continue; @@ -196,8 +198,10 @@ static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder) if (connector->state->best_encoder != encoder) continue; + drm_connector_list_iter_put(&conn_iter); return connector->state->crtc; } + drm_connector_list_iter_put(&conn_iter); /* Don't return stale data (e.g. pending async disable). */ if (uses_atomic) diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index a9a40dc629d3..649f1da3596f 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -94,6 +94,7 @@ int drm_mode_getresources(struct drm_device *dev, void *data, uint32_t __user *crtc_id; uint32_t __user *connector_id; uint32_t __user *encoder_id; + struct drm_connector_list_iter conn_iter; if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EINVAL; @@ -113,9 +114,6 @@ int drm_mode_getresources(struct drm_device *dev, void *data, card_res->count_fbs = count; mutex_unlock(&file_priv->fbs_lock); - /* mode_config.mutex protects the connector list against e.g. DP MST - * connector hot-adding. CRTC/Plane lists are invariant. */ - mutex_lock(&dev->mode_config.mutex); card_res->max_height = dev->mode_config.max_height; card_res->min_height = dev->mode_config.min_height; card_res->max_width = dev->mode_config.max_width; @@ -125,10 +123,8 @@ int drm_mode_getresources(struct drm_device *dev, void *data, crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr); drm_for_each_crtc(crtc, dev) { if (count < card_res->count_crtcs && - put_user(crtc->base.id, crtc_id + count)) { - ret = -EFAULT; - goto out; - } + put_user(crtc->base.id, crtc_id + count)) + return -EFAULT; count++; } card_res->count_crtcs = count; @@ -137,28 +133,26 @@ int drm_mode_getresources(struct drm_device *dev, void *data, encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr); drm_for_each_encoder(encoder, dev) { if (count < card_res->count_encoders && - put_user(encoder->base.id, encoder_id + count)) { - ret = -EFAULT; - goto out; - } + put_user(encoder->base.id, encoder_id + count)) + return -EFAULT; count++; } card_res->count_encoders = count; + drm_connector_list_iter_get(dev, &conn_iter); count = 0; connector_id = u64_to_user_ptr(card_res->connector_id_ptr); - drm_for_each_connector(connector, dev) { + drm_for_each_connector_iter(connector, &conn_iter) { if (count < card_res->count_connectors && put_user(connector->base.id, connector_id + count)) { - ret = -EFAULT; - goto out; + drm_connector_list_iter_put(&conn_iter); + return -EFAULT; } count++; } card_res->count_connectors = count; + drm_connector_list_iter_put(&conn_iter); -out: - mutex_unlock(&dev->mode_config.mutex); return ret; } @@ -176,6 +170,7 @@ void drm_mode_config_reset(struct drm_device *dev) struct drm_plane *plane; struct drm_encoder *encoder; struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; drm_for_each_plane(plane, dev) if (plane->funcs->reset) @@ -189,11 +184,11 @@ void drm_mode_config_reset(struct drm_device *dev) if (encoder->funcs->reset) encoder->funcs->reset(encoder); - mutex_lock(&dev->mode_config.mutex); - drm_for_each_connector(connector, dev) + drm_connector_list_iter_get(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) if (connector->funcs->reset) connector->funcs->reset(connector); - mutex_unlock(&dev->mode_config.mutex); + drm_connector_list_iter_put(&conn_iter); } EXPORT_SYMBOL(drm_mode_config_reset); @@ -374,6 +369,7 @@ void drm_mode_config_init(struct drm_device *dev) idr_init(&dev->mode_config.crtc_idr); idr_init(&dev->mode_config.tile_idr); ida_init(&dev->mode_config.connector_ida); + spin_lock_init(&dev->mode_config.connector_list_lock); drm_mode_create_standard_properties(dev); diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index a9b95246e26e..0e41a2e184a9 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -839,6 +839,11 @@ void drm_mode_put_tile_group(struct drm_device *dev, * @dev: the DRM device * * Iterate over all connectors of @dev. + * + * WARNING: + * + * This iterator is not safe against hotadd/removal of connectors and is + * deprecated. Use drm_for_each_connector_iter() instead. */ #define drm_for_each_connector(connector, dev) \ for (assert_drm_connector_list_read_locked(&(dev)->mode_config), \ @@ -847,4 +852,37 @@ void drm_mode_put_tile_group(struct drm_device *dev, &connector->head != (&(dev)->mode_config.connector_list); \ connector = list_next_entry(connector, head)) +/** + * struct drm_connector_list_iter - connector_list iterator + * + * This iterator tracks state needed to be able to walk the connector_list + * within struct drm_mode_config. Only use together with + * drm_connector_list_iter_get(), drm_connector_list_iter_put() and + * drm_connector_list_iter_next() respectively the convenience macro + * drm_for_each_connector_iter(). + */ +struct drm_connector_list_iter { +/* private: */ + struct drm_device *dev; + struct drm_connector *conn; +}; + +void drm_connector_list_iter_get(struct drm_device *dev, + struct drm_connector_list_iter *iter); +struct drm_connector * +drm_connector_list_iter_next(struct drm_connector_list_iter *iter); +void drm_connector_list_iter_put(struct drm_connector_list_iter *iter); + +/** + * drm_for_each_connector_iter - connector_list iterator macro + * @connector: struct &drm_connector pointer used as cursor + * @iter: struct &drm_connector_list_iter + * + * Note that @connector is only valid within the list body, if you want to use + * @connector after calling drm_connector_list_iter_put() then you need to grab + * your own reference first using drm_connector_reference(). + */ +#define drm_for_each_connector_iter(connector, iter) \ + while ((connector = drm_connector_list_iter_next(iter))) + #endif diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index bf9991b20611..5b735549bd51 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -365,7 +365,13 @@ struct drm_mode_config { struct list_head fb_list; /** - * @num_connector: Number of connectors on this device. + * @connector_list_lock: Protects @num_connector and + * @connector_list. + */ + spinlock_t connector_list_lock; + /** + * @num_connector: Number of connectors on this device. Protected by + * @connector_list_lock. */ int num_connector; /** @@ -373,7 +379,9 @@ struct drm_mode_config { */ struct ida connector_ida; /** - * @connector_list: List of connector objects. + * @connector_list: List of connector objects. Protected by + * @connector_list_lock. Only use drm_for_each_connector_iter() and + * struct &drm_connector_list_iter to walk this list. */ struct list_head connector_list; int num_encoder; |