genalloc: add devres support, allow to find a managed pool by device

This patch adds three exported functions to lib/genalloc.c:
devm_gen_pool_create, dev_get_gen_pool, and of_get_named_gen_pool.

devm_gen_pool_create is a managed version of gen_pool_create that keeps
track of the pool via devres and allows the management code to
automatically destroy it after device removal.

dev_get_gen_pool retrieves the gen_pool for a given device, if it was
created with devm_gen_pool_create, using devres_find.

of_get_named_gen_pool retrieves the gen_pool for a given device node and
property name, where the property must contain a phandle pointing to a
platform device node.  The corresponding platform device is then fed into
dev_get_gen_pool and the resulting gen_pool is returned.

[akpm@linux-foundation.org: make the of_get_named_gen_pool() stub static, fixing a zillion link errors]
[akpm@linux-foundation.org: squish "struct device declared inside parameter list" warning]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Michal Simek <monstr@monstr.eu>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Matt Porter <mporter@ti.com>
Cc: Dong Aisheng <dong.aisheng@linaro.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Javier Martin <javier.martin@vista-silicon.com>
Cc: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Philipp Zabel 2013-04-29 16:17:10 -07:00 committed by Linus Torvalds
parent 3119b487e0
commit 9375db07ad
2 changed files with 99 additions and 0 deletions

View File

@ -29,6 +29,10 @@
#ifndef __GENALLOC_H__
#define __GENALLOC_H__
struct device;
struct device_node;
/**
* Allocation callback function type definition
* @map: Pointer to bitmap
@ -105,4 +109,18 @@ extern unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size,
extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data);
extern struct gen_pool *devm_gen_pool_create(struct device *dev,
int min_alloc_order, int nid);
extern struct gen_pool *dev_get_gen_pool(struct device *dev);
#ifdef CONFIG_OF
extern struct gen_pool *of_get_named_gen_pool(struct device_node *np,
const char *propname, int index);
#else
static inline struct gen_pool *of_get_named_gen_pool(struct device_node *np,
const char *propname, int index)
{
return NULL;
}
#endif
#endif /* __GENALLOC_H__ */

View File

@ -34,6 +34,8 @@
#include <linux/rculist.h>
#include <linux/interrupt.h>
#include <linux/genalloc.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set)
{
@ -480,3 +482,82 @@ unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
return start_bit;
}
EXPORT_SYMBOL(gen_pool_best_fit);
static void devm_gen_pool_release(struct device *dev, void *res)
{
gen_pool_destroy(*(struct gen_pool **)res);
}
/**
* devm_gen_pool_create - managed gen_pool_create
* @dev: device that provides the gen_pool
* @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
* @nid: node id of the node the pool structure should be allocated on, or -1
*
* Create a new special memory pool that can be used to manage special purpose
* memory not managed by the regular kmalloc/kfree interface. The pool will be
* automatically destroyed by the device management code.
*/
struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
int nid)
{
struct gen_pool **ptr, *pool;
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
*ptr = pool;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return pool;
}
/**
* dev_get_gen_pool - Obtain the gen_pool (if any) for a device
* @dev: device to retrieve the gen_pool from
* @name: Optional name for the gen_pool, usually NULL
*
* Returns the gen_pool for the device if one is present, or NULL.
*/
struct gen_pool *dev_get_gen_pool(struct device *dev)
{
struct gen_pool **p = devres_find(dev, devm_gen_pool_release, NULL,
NULL);
if (!p)
return NULL;
return *p;
}
EXPORT_SYMBOL_GPL(dev_get_gen_pool);
#ifdef CONFIG_OF
/**
* of_get_named_gen_pool - find a pool by phandle property
* @np: device node
* @propname: property name containing phandle(s)
* @index: index into the phandle array
*
* Returns the pool that contains the chunk starting at the physical
* address of the device tree node pointed at by the phandle property,
* or NULL if not found.
*/
struct gen_pool *of_get_named_gen_pool(struct device_node *np,
const char *propname, int index)
{
struct platform_device *pdev;
struct device_node *np_pool;
np_pool = of_parse_phandle(np, propname, index);
if (!np_pool)
return NULL;
pdev = of_find_device_by_node(np_pool);
if (!pdev)
return NULL;
return dev_get_gen_pool(&pdev->dev);
}
EXPORT_SYMBOL_GPL(of_get_named_gen_pool);
#endif /* CONFIG_OF */