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genalloc: add support of multiple gen_pools per device

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This change fills devm_gen_pool_create()/gen_pool_get() "name" argument
stub with contents and extends of_gen_pool_get() functionality on this
basis.

If there is no associated platform device with a device node passed to
of_gen_pool_get(), the function attempts to get a label property or device
node name (= repeats MTD OF partition standard) and seeks for a named
gen_pool registered by device of the parent device node.

The main idea of the change is to allow registration of independent
gen_pools under the same umbrella device, say "partitions" on "storage
device", the original functionality of one "partition" per "storage
device" is untouched.

[akpm@linux-foundation.org: fix constness in devres_find()]
[dan.carpenter@oracle.com: freeing const data pointers]
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Zapolskiy 2015-09-04 15:47:47 -07:00 committed by Linus Torvalds
parent 7385817359
commit c98c36355d
2 changed files with 62 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/genalloc.h
View File

@ -59,6 +59,8 @@ struct gen_pool {
genpool_algo_t algo; /* allocation function */
void *data;
const char *name;
};
/*

77
lib/genalloc.c
View File

@ -160,6 +160,7 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
pool->min_alloc_order = min_alloc_order;
pool->algo = gen_pool_first_fit;
pool->data = NULL;
pool->name = NULL;
}
return pool;
}
@ -252,8 +253,8 @@ void gen_pool_destroy(struct gen_pool *pool)
kfree(chunk);
}
kfree_const(pool->name);
kfree(pool);
return;
}
EXPORT_SYMBOL(gen_pool_destroy);
@ -570,6 +571,20 @@ static void devm_gen_pool_release(struct device *dev, void *res)
gen_pool_destroy(*(struct gen_pool **)res);
}
static int devm_gen_pool_match(struct device *dev, void *res, void *data)
{
struct gen_pool **p = res;
/* NULL data matches only a pool without an assigned name */
if (!data && !(*p)->name)
return 1;
if (!data || !(*p)->name)
return 0;
return !strcmp((*p)->name, data);
}
/**
* gen_pool_get - Obtain the gen_pool (if any) for a device
* @dev: device to retrieve the gen_pool from
@ -581,7 +596,8 @@ struct gen_pool *gen_pool_get(struct device *dev, const char *name)
{
struct gen_pool **p;
p = devres_find(dev, devm_gen_pool_release, NULL, NULL);
p = devres_find(dev, devm_gen_pool_release, devm_gen_pool_match,
(void *)name);
if (!p)
return NULL;
return *p;
@ -603,25 +619,38 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
int nid, const char *name)
{
struct gen_pool **ptr, *pool;
const char *pool_name = NULL;
/* Check that genpool to be created is uniquely addressed on device */
if (gen_pool_get(dev, name))
return ERR_PTR(-EINVAL);
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
*ptr = pool;
devres_add(dev, ptr);
} else {
devres_free(ptr);
return ERR_PTR(-ENOMEM);
if (name) {
pool_name = kstrdup_const(name, GFP_KERNEL);
if (!pool_name)
return ERR_PTR(-ENOMEM);
}
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
goto free_pool_name;
pool = gen_pool_create(min_alloc_order, nid);
if (!pool)
goto free_devres;
*ptr = pool;
pool->name = pool_name;
devres_add(dev, ptr);
return pool;
free_devres:
devres_free(ptr);
free_pool_name:
kfree_const(pool_name);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(devm_gen_pool_create);
@ -640,16 +669,30 @@ struct gen_pool *of_gen_pool_get(struct device_node *np,
const char *propname, int index)
{
struct platform_device *pdev;
struct device_node *np_pool;
struct device_node *np_pool, *parent;
const char *name = NULL;
struct gen_pool *pool = NULL;
np_pool = of_parse_phandle(np, propname, index);
if (!np_pool)
return NULL;
pdev = of_find_device_by_node(np_pool);
if (!pdev) {
/* Check if named gen_pool is created by parent node device */
parent = of_get_parent(np_pool);
pdev = of_find_device_by_node(parent);
of_node_put(parent);
of_property_read_string(np_pool, "label", &name);
if (!name)
name = np_pool->name;
}
if (pdev)
pool = gen_pool_get(&pdev->dev, name);
of_node_put(np_pool);
if (!pdev)
return NULL;
return gen_pool_get(&pdev->dev, NULL);
return pool;
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */