linux-kernel - [PATCH v4 01/34] component: Introduce struct aggregate

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Date:   Thu,  2 Dec 2021 14:26:59 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Saravana Kannan <saravanak@...gle.com>
Subject: [PATCH v4 01/34] component: Introduce struct aggregate_device

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@...ll.ch>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rob Clark <robdclark@...il.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/base/component.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index 2d25a6416587..d25048d04b70 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/list.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
@@ -63,7 +64,10 @@ struct master {
 
 	const struct component_master_ops *ops;
 	struct device *parent;
+	struct device dev;
 	struct component_match *match;
+
+	int id;
 };
 
 struct component {
@@ -79,6 +83,7 @@ struct component {
 static DEFINE_MUTEX(component_mutex);
 static LIST_HEAD(component_list);
 static LIST_HEAD(masters);
+static DEFINE_IDA(aggregate_ida);
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -440,6 +445,7 @@ static void free_master(struct master *master)
 		}
 	}
 
+	ida_free(&aggregate_ida, master->id);
 	kfree(master);
 }
 
@@ -460,7 +466,7 @@ int component_master_add_with_match(struct device *parent,
 	struct component_match *match)
 {
 	struct master *master;
-	int ret;
+	int ret, id;
 
 	/* Reallocate the match array for its true size */
 	ret = component_match_realloc(match, match->num);
@@ -471,9 +477,17 @@ int component_master_add_with_match(struct device *parent,
 	if (!master)
 		return -ENOMEM;
 
+	id = ida_alloc(&aggregate_ida, GFP_KERNEL);
+	if (id < 0) {
+		kfree(master);
+		return id;
+	}
+
+	master->id = id;
 	master->parent = parent;
 	master->ops = ops;
 	master->match = match;
+	dev_set_name(&master->dev, "aggregate%d", id);
 
 	component_master_debugfs_add(master);
 	/* Add to the list of available masters. */
-- 
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