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From: Stephen Boyd <swboyd@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Rob Clark <robdclark@gmail.com>,
	Russell King <rmk+kernel@arm.linux.org.uk>,
	Saravana Kannan <saravanak@google.com>
Subject: [PATCH 3/7] component: Introduce struct aggregate_device
Date: Wed, 19 May 2021 17:25:15 -0700	[thread overview]
Message-ID: <20210520002519.3538432-4-swboyd@chromium.org> (raw)
In-Reply-To: <20210520002519.3538432-1-swboyd@chromium.org>

Replace 'struct master' with 'struct aggregate_device' and then rename
'master' to 'adev' everywhere in the code. While we're here, put a
struct device inside the aggregate device so that we can register it
with a bus_type in the next patch.

The diff is large but that's because this is mostly a rename, where
sometimes 'master' is replaced with 'adev' and other times it is
replaced with 'parent' to indicate that the struct device that was being
used is actually the parent of the aggregate device and driver.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/base/component.c  | 249 ++++++++++++++++++++------------------
 include/linux/component.h |   2 +-
 2 files changed, 134 insertions(+), 117 deletions(-)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index 5e79299f6c3f..55e30e0b0952 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -9,6 +9,7 @@
  */
 #include <linux/component.h>
 #include <linux/device.h>
+#include <linux/idr.h>
 #include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
@@ -58,18 +59,21 @@ struct component_match {
 	struct component_match_array *compare;
 };
 
-struct master {
+struct aggregate_device {
 	struct list_head node;
 	bool bound;
 
 	const struct component_master_ops *ops;
 	struct device *parent;
+	struct device dev;
 	struct component_match *match;
+
+	int id;
 };
 
 struct component {
 	struct list_head node;
-	struct master *master;
+	struct aggregate_device *adev;
 	bool bound;
 
 	const struct component_ops *ops;
@@ -79,7 +83,9 @@ struct component {
 
 static DEFINE_MUTEX(component_mutex);
 static LIST_HEAD(component_list);
-static LIST_HEAD(masters);
+static LIST_HEAD(aggregate_devices);
+
+static DEFINE_IDA(aggregate_ida);
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -87,12 +93,12 @@ static struct dentry *component_debugfs_dir;
 
 static int component_devices_show(struct seq_file *s, void *data)
 {
-	struct master *m = s->private;
+	struct aggregate_device *m = s->private;
 	struct component_match *match = m->match;
 	size_t i;
 
 	mutex_lock(&component_mutex);
-	seq_printf(s, "%-40s %20s\n", "master name", "status");
+	seq_printf(s, "%-40s %20s\n", "aggregate_device name", "status");
 	seq_puts(s, "-------------------------------------------------------------\n");
 	seq_printf(s, "%-40s %20s\n\n",
 		   dev_name(m->parent), m->bound ? "bound" : "not bound");
@@ -122,46 +128,46 @@ static int __init component_debug_init(void)
 
 core_initcall(component_debug_init);
 
-static void component_master_debugfs_add(struct master *m)
+static void component_master_debugfs_add(struct aggregate_device *m)
 {
 	debugfs_create_file(dev_name(m->parent), 0444, component_debugfs_dir, m,
 			    &component_devices_fops);
 }
 
-static void component_master_debugfs_del(struct master *m)
+static void component_master_debugfs_del(struct aggregate_device *m)
 {
 	debugfs_remove(debugfs_lookup(dev_name(m->parent), component_debugfs_dir));
 }
 
 #else
 
-static void component_master_debugfs_add(struct master *m)
+static void component_master_debugfs_add(struct aggregate_device *m)
 { }
 
-static void component_master_debugfs_del(struct master *m)
+static void component_master_debugfs_del(struct aggregate_device *m)
 { }
 
 #endif
 
-static struct master *__master_find(struct device *parent,
+static struct aggregate_device *__aggregate_find(struct device *parent,
 	const struct component_master_ops *ops)
 {
-	struct master *m;
+	struct aggregate_device *m;
 
-	list_for_each_entry(m, &masters, node)
+	list_for_each_entry(m, &aggregate_devices, node)
 		if (m->parent == parent && (!ops || m->ops == ops))
 			return m;
 
 	return NULL;
 }
 
-static struct component *find_component(struct master *master,
+static struct component *find_component(struct aggregate_device *adev,
 	struct component_match_array *mc)
 {
 	struct component *c;
 
 	list_for_each_entry(c, &component_list, node) {
-		if (c->master && c->master != master)
+		if (c->adev && c->adev != adev)
 			continue;
 
 		if (mc->compare && mc->compare(c->dev, mc->data))
@@ -175,101 +181,102 @@ static struct component *find_component(struct master *master,
 	return NULL;
 }
 
-static int find_components(struct master *master)
+static int find_components(struct aggregate_device *adev)
 {
-	struct component_match *match = master->match;
+	struct component_match *match = adev->match;
 	size_t i;
 	int ret = 0;
 
 	/*
 	 * Scan the array of match functions and attach
-	 * any components which are found to this master.
+	 * any components which are found to this adev.
 	 */
 	for (i = 0; i < match->num; i++) {
 		struct component_match_array *mc = &match->compare[i];
 		struct component *c;
 
-		dev_dbg(master->parent, "Looking for component %zu\n", i);
+		dev_dbg(adev->parent, "Looking for component %zu\n", i);
 
 		if (match->compare[i].component)
 			continue;
 
-		c = find_component(master, mc);
+		c = find_component(adev, mc);
 		if (!c) {
 			ret = -ENXIO;
 			break;
 		}
 
-		dev_dbg(master->parent, "found component %s, duplicate %u\n", dev_name(c->dev), !!c->master);
+		dev_dbg(adev->parent, "found component %s, duplicate %u\n",
+			dev_name(c->dev), !!c->adev);
 
-		/* Attach this component to the master */
-		match->compare[i].duplicate = !!c->master;
+		/* Attach this component to the adev */
+		match->compare[i].duplicate = !!c->adev;
 		match->compare[i].component = c;
-		c->master = master;
+		c->adev = adev;
 	}
 	return ret;
 }
 
 /* Detach component from associated master */
-static void remove_component(struct master *master, struct component *c)
+static void remove_component(struct aggregate_device *adev, struct component *c)
 {
 	size_t i;
 
-	/* Detach the component from this master. */
-	for (i = 0; i < master->match->num; i++)
-		if (master->match->compare[i].component == c)
-			master->match->compare[i].component = NULL;
+	/* Detach the component from this adev. */
+	for (i = 0; i < adev->match->num; i++)
+		if (adev->match->compare[i].component == c)
+			adev->match->compare[i].component = NULL;
 }
 
 /*
- * Try to bring up a master.  If component is NULL, we're interested in
- * this master, otherwise it's a component which must be present to try
- * and bring up the master.
+ * Try to bring up an aggregate device.  If component is NULL, we're interested
+ * in this aggregate device, otherwise it's a component which must be present
+ * to try and bring up the aggregate device.
  *
  * Returns 1 for successful bringup, 0 if not ready, or -ve errno.
  */
-static int try_to_bring_up_master(struct master *master,
+static int try_to_bring_up_aggregate_device(struct aggregate_device *adev,
 	struct component *component)
 {
 	int ret;
 
-	dev_dbg(master->parent, "trying to bring up master\n");
+	dev_dbg(adev->parent, "trying to bring up adev\n");
 
-	if (find_components(master)) {
-		dev_dbg(master->parent, "master has incomplete components\n");
+	if (find_components(adev)) {
+		dev_dbg(adev->parent, "master has incomplete components\n");
 		return 0;
 	}
 
-	if (component && component->master != master) {
-		dev_dbg(master->parent, "master is not for this component (%s)\n",
+	if (component && component->adev != adev) {
+		dev_dbg(adev->parent, "master is not for this component (%s)\n",
 			dev_name(component->dev));
 		return 0;
 	}
 
-	if (!devres_open_group(master->parent, NULL, GFP_KERNEL))
+	if (!devres_open_group(adev->parent, NULL, GFP_KERNEL))
 		return -ENOMEM;
 
 	/* Found all components */
-	ret = master->ops->bind(master->parent);
+	ret = adev->ops->bind(adev->parent);
 	if (ret < 0) {
-		devres_release_group(master->parent, NULL);
+		devres_release_group(adev->parent, NULL);
 		if (ret != -EPROBE_DEFER)
-			dev_info(master->parent, "master bind failed: %d\n", ret);
+			dev_info(adev->parent, "adev bind failed: %d\n", ret);
 		return ret;
 	}
 
-	master->bound = true;
+	adev->bound = true;
 	return 1;
 }
 
 static int try_to_bring_up_masters(struct component *component)
 {
-	struct master *m;
+	struct aggregate_device *adev;
 	int ret = 0;
 
-	list_for_each_entry(m, &masters, node) {
-		if (!m->bound) {
-			ret = try_to_bring_up_master(m, component);
+	list_for_each_entry(adev, &aggregate_devices, node) {
+		if (!adev->bound) {
+			ret = try_to_bring_up_aggregate_device(adev, component);
 			if (ret != 0)
 				break;
 		}
@@ -278,12 +285,12 @@ static int try_to_bring_up_masters(struct component *component)
 	return ret;
 }
 
-static void take_down_master(struct master *master)
+static void take_down_aggregate_device(struct aggregate_device *adev)
 {
-	if (master->bound) {
-		master->ops->unbind(master->parent);
-		devres_release_group(master->parent, NULL);
-		master->bound = false;
+	if (adev->bound) {
+		adev->ops->unbind(adev->parent);
+		devres_release_group(adev->parent, NULL);
+		adev->bound = false;
 	}
 }
 
@@ -324,7 +331,7 @@ static int component_match_realloc(struct component_match *match, size_t num)
 	return 0;
 }
 
-static void __component_match_add(struct device *master,
+static void __component_match_add(struct device *parent,
 	struct component_match **matchptr,
 	void (*release)(struct device *, void *),
 	int (*compare)(struct device *, void *),
@@ -344,7 +351,7 @@ static void __component_match_add(struct device *master,
 			return;
 		}
 
-		devres_add(master, match);
+		devres_add(parent, match);
 
 		*matchptr = match;
 	}
@@ -370,13 +377,13 @@ static void __component_match_add(struct device *master,
 
 /**
  * component_match_add_release - add a component match entry with release callback
- * @master: device with the aggregate driver
+ * @parent: parent device of the aggregate driver
  * @matchptr: pointer to the list of component matches
  * @release: release function for @compare_data
  * @compare: compare function to match against all components
  * @compare_data: opaque pointer passed to the @compare function
  *
- * Adds a new component match to the list stored in @matchptr, which the @master
+ * Adds a new component match to the list stored in @matchptr, which the
  * aggregate driver needs to function. The list of component matches pointed to
  * by @matchptr must be initialized to NULL before adding the first match. This
  * only matches against components added with component_add().
@@ -388,19 +395,19 @@ static void __component_match_add(struct device *master,
  *
  * See also component_match_add() and component_match_add_typed().
  */
-void component_match_add_release(struct device *master,
+void component_match_add_release(struct device *parent,
 	struct component_match **matchptr,
 	void (*release)(struct device *, void *),
 	int (*compare)(struct device *, void *), void *compare_data)
 {
-	__component_match_add(master, matchptr, release, compare, NULL,
+	__component_match_add(parent, matchptr, release, compare, NULL,
 			      compare_data);
 }
 EXPORT_SYMBOL(component_match_add_release);
 
 /**
  * component_match_add_typed - add a component match entry for a typed component
- * @master: device with the aggregate driver
+ * @parent: parent device of the aggregate driver
  * @matchptr: pointer to the list of component matches
  * @compare_typed: compare function to match against all typed components
  * @compare_data: opaque pointer passed to the @compare function
@@ -415,32 +422,33 @@ EXPORT_SYMBOL(component_match_add_release);
  *
  * See also component_match_add_release() and component_match_add_typed().
  */
-void component_match_add_typed(struct device *master,
+void component_match_add_typed(struct device *parent,
 	struct component_match **matchptr,
 	int (*compare_typed)(struct device *, int, void *), void *compare_data)
 {
-	__component_match_add(master, matchptr, NULL, NULL, compare_typed,
+	__component_match_add(parent, matchptr, NULL, NULL, compare_typed,
 			      compare_data);
 }
 EXPORT_SYMBOL(component_match_add_typed);
 
-static void free_master(struct master *master)
+static void free_aggregate_device(struct aggregate_device *adev)
 {
-	struct component_match *match = master->match;
+	struct component_match *match = adev->match;
 	int i;
 
-	component_master_debugfs_del(master);
-	list_del(&master->node);
+	component_master_debugfs_del(adev);
+	list_del(&adev->node);
 
 	if (match) {
 		for (i = 0; i < match->num; i++) {
 			struct component *c = match->compare[i].component;
 			if (c)
-				c->master = NULL;
+				c->adev = NULL;
 		}
 	}
 
-	kfree(master);
+	ida_free(&aggregate_ida, adev->id);
+	kfree(adev);
 }
 
 /**
@@ -459,31 +467,40 @@ int component_master_add_with_match(struct device *parent,
 	const struct component_master_ops *ops,
 	struct component_match *match)
 {
-	struct master *master;
-	int ret;
+	struct aggregate_device *adev;
+	int ret, id;
 
 	/* Reallocate the match array for its true size */
 	ret = component_match_realloc(match, match->num);
 	if (ret)
 		return ret;
 
-	master = kzalloc(sizeof(*master), GFP_KERNEL);
-	if (!master)
+	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+	if (!adev)
 		return -ENOMEM;
 
-	master->parent = parent;
-	master->ops = ops;
-	master->match = match;
+	id = ida_alloc(&aggregate_ida, GFP_KERNEL);
+	if (id < 0) {
+		kfree(adev);
+		return id;
+	}
+
+	adev->id = id;
+	adev->parent = parent;
+	adev->dev.parent = parent;
+	adev->ops = ops;
+	adev->match = match;
+	dev_set_name(&adev->dev, "aggregate%d", id);
 
-	component_master_debugfs_add(master);
-	/* Add to the list of available masters. */
+	component_master_debugfs_add(adev);
+	/* Add to the list of available aggregate devices. */
 	mutex_lock(&component_mutex);
-	list_add(&master->node, &masters);
+	list_add(&adev->node, &aggregate_devices);
 
-	ret = try_to_bring_up_master(master, NULL);
+	ret = try_to_bring_up_aggregate_device(adev, NULL);
 
 	if (ret < 0)
-		free_master(master);
+		free_aggregate_device(adev);
 
 	mutex_unlock(&component_mutex);
 
@@ -503,25 +520,25 @@ EXPORT_SYMBOL_GPL(component_master_add_with_match);
 void component_master_del(struct device *parent,
 	const struct component_master_ops *ops)
 {
-	struct master *master;
+	struct aggregate_device *adev;
 
 	mutex_lock(&component_mutex);
-	master = __master_find(parent, ops);
-	if (master) {
-		take_down_master(master);
-		free_master(master);
+	adev = __aggregate_find(parent, ops);
+	if (adev) {
+		take_down_aggregate_device(adev);
+		free_aggregate_device(adev);
 	}
 	mutex_unlock(&component_mutex);
 }
 EXPORT_SYMBOL_GPL(component_master_del);
 
 static void component_unbind(struct component *component,
-	struct master *master, void *data)
+	struct aggregate_device *adev, void *data)
 {
 	WARN_ON(!component->bound);
 
 	if (component->ops && component->ops->unbind)
-		component->ops->unbind(component->dev, master->parent, data);
+		component->ops->unbind(component->dev, adev->parent, data);
 	component->bound = false;
 
 	/* Release all resources claimed in the binding of this component */
@@ -539,26 +556,26 @@ static void component_unbind(struct component *component,
  */
 void component_unbind_all(struct device *parent, void *data)
 {
-	struct master *master;
+	struct aggregate_device *adev;
 	struct component *c;
 	size_t i;
 
 	WARN_ON(!mutex_is_locked(&component_mutex));
 
-	master = __master_find(parent, NULL);
-	if (!master)
+	adev = __aggregate_find(parent, NULL);
+	if (!adev)
 		return;
 
 	/* Unbind components in reverse order */
-	for (i = master->match->num; i--; )
-		if (!master->match->compare[i].duplicate) {
-			c = master->match->compare[i].component;
-			component_unbind(c, master, data);
+	for (i = adev->match->num; i--; )
+		if (!adev->match->compare[i].duplicate) {
+			c = adev->match->compare[i].component;
+			component_unbind(c, adev, data);
 		}
 }
 EXPORT_SYMBOL_GPL(component_unbind_all);
 
-static int component_bind(struct component *component, struct master *master,
+static int component_bind(struct component *component, struct aggregate_device *adev,
 	void *data)
 {
 	int ret;
@@ -568,7 +585,7 @@ static int component_bind(struct component *component, struct master *master,
 	 * This allows us to roll-back a failed component without
 	 * affecting anything else.
 	 */
-	if (!devres_open_group(master->parent, NULL, GFP_KERNEL))
+	if (!devres_open_group(adev->parent, NULL, GFP_KERNEL))
 		return -ENOMEM;
 
 	/*
@@ -577,14 +594,14 @@ static int component_bind(struct component *component, struct master *master,
 	 * at the appropriate moment.
 	 */
 	if (!devres_open_group(component->dev, component, GFP_KERNEL)) {
-		devres_release_group(master->parent, NULL);
+		devres_release_group(adev->parent, NULL);
 		return -ENOMEM;
 	}
 
-	dev_dbg(master->parent, "binding %s (ops %ps)\n",
+	dev_dbg(adev->parent, "binding %s (ops %ps)\n",
 		dev_name(component->dev), component->ops);
 
-	ret = component->ops->bind(component->dev, master->parent, data);
+	ret = component->ops->bind(component->dev, adev->parent, data);
 	if (!ret) {
 		component->bound = true;
 
@@ -595,16 +612,16 @@ static int component_bind(struct component *component, struct master *master,
 		 * can clean those resources up independently.
 		 */
 		devres_close_group(component->dev, NULL);
-		devres_remove_group(master->parent, NULL);
+		devres_remove_group(adev->parent, NULL);
 
-		dev_info(master->parent, "bound %s (ops %ps)\n",
+		dev_info(adev->parent, "bound %s (ops %ps)\n",
 			 dev_name(component->dev), component->ops);
 	} else {
 		devres_release_group(component->dev, NULL);
-		devres_release_group(master->parent, NULL);
+		devres_release_group(adev->parent, NULL);
 
 		if (ret != -EPROBE_DEFER)
-			dev_err(master->parent, "failed to bind %s (ops %ps): %d\n",
+			dev_err(adev->parent, "failed to bind %s (ops %ps): %d\n",
 				dev_name(component->dev), component->ops, ret);
 	}
 
@@ -622,31 +639,31 @@ static int component_bind(struct component *component, struct master *master,
  */
 int component_bind_all(struct device *parent, void *data)
 {
-	struct master *master;
+	struct aggregate_device *adev;
 	struct component *c;
 	size_t i;
 	int ret = 0;
 
 	WARN_ON(!mutex_is_locked(&component_mutex));
 
-	master = __master_find(parent, NULL);
-	if (!master)
+	adev = __aggregate_find(parent, NULL);
+	if (!adev)
 		return -EINVAL;
 
 	/* Bind components in match order */
-	for (i = 0; i < master->match->num; i++)
-		if (!master->match->compare[i].duplicate) {
-			c = master->match->compare[i].component;
-			ret = component_bind(c, master, data);
+	for (i = 0; i < adev->match->num; i++)
+		if (!adev->match->compare[i].duplicate) {
+			c = adev->match->compare[i].component;
+			ret = component_bind(c, adev, data);
 			if (ret)
 				break;
 		}
 
 	if (ret != 0) {
 		for (; i > 0; i--)
-			if (!master->match->compare[i - 1].duplicate) {
-				c = master->match->compare[i - 1].component;
-				component_unbind(c, master, data);
+			if (!adev->match->compare[i - 1].duplicate) {
+				c = adev->match->compare[i - 1].component;
+				component_unbind(c, adev, data);
 			}
 	}
 
@@ -675,8 +692,8 @@ static int __component_add(struct device *dev, const struct component_ops *ops,
 
 	ret = try_to_bring_up_masters(component);
 	if (ret < 0) {
-		if (component->master)
-			remove_component(component->master, component);
+		if (component->adev)
+			remove_component(component->adev, component);
 		list_del(&component->node);
 
 		kfree(component);
@@ -757,9 +774,9 @@ void component_del(struct device *dev, const struct component_ops *ops)
 			break;
 		}
 
-	if (component && component->master) {
-		take_down_master(component->master);
-		remove_component(component->master, component);
+	if (component && component->adev) {
+		take_down_aggregate_device(component->adev);
+		remove_component(component->adev, component);
 	}
 
 	mutex_unlock(&component_mutex);
diff --git a/include/linux/component.h b/include/linux/component.h
index 16de18f473d7..71bfc3862633 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -41,7 +41,7 @@ void component_del(struct device *, const struct component_ops *);
 int component_bind_all(struct device *master, void *master_data);
 void component_unbind_all(struct device *master, void *master_data);
 
-struct master;
+struct aggregate_device;
 
 /**
  * struct component_master_ops - callback for the aggregate driver
-- 
https://chromeos.dev


  parent reply	other threads:[~2021-05-20  0:25 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-20  0:25 [PATCH 0/7] component: Make into an aggregate bus Stephen Boyd
2021-05-20  0:25 ` [PATCH 1/7] component: Drop 'dev' argument to component_match_realloc() Stephen Boyd
2021-05-20  0:25 ` [PATCH 2/7] component: Rename 'dev' to 'parent' Stephen Boyd
2021-05-20  0:25 ` Stephen Boyd [this message]
2021-05-20 20:20   ` [PATCH 3/7] component: Introduce struct aggregate_device Saravana Kannan
2021-05-24  6:01     ` Stephen Boyd
2021-05-20  0:25 ` [PATCH 4/7] component: Introduce the aggregate bus_type Stephen Boyd
2021-05-20  0:25 ` [PATCH 5/7] component: Use dev.parent instead of adev->parent Stephen Boyd
2021-05-20  0:25 ` [PATCH 6/7] component: Move struct aggregate_device out to header file Stephen Boyd
2021-05-20  0:25 ` [PATCH 7/7] drm/msm: Migrate to aggregate driver Stephen Boyd
2021-05-20 19:58   ` Daniel Vetter
2021-05-20 20:22     ` Saravana Kannan
2021-05-24  6:45     ` Stephen Boyd
2021-05-20  1:27 ` [PATCH 0/7] component: Make into an aggregate bus Saravana Kannan
2021-05-20  1:41   ` Stephen Boyd
2021-05-20 19:30     ` Saravana Kannan
2021-05-20 20:03     ` Daniel Vetter

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