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Commit ff86aae3 authored by Madalin Bucur's avatar Madalin Bucur Committed by David S. Miller
Browse files

devres: add devm_alloc_percpu() 



Introduce managed counterparts for alloc_percpu() and free_percpu().
Add devm_alloc_percpu() and devm_free_percpu() into the managed
interfaces list.

Signed-off-by: default avatarMadalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 319b0534

Documentation/driver-model/devres.txt

+4 −0
Original line number Original line Diff line number Diff line
@@ -332,6 +332,10 @@ MEM 
MFD

MFD

 devm_mfd_add_devices()

 devm_mfd_add_devices()





PER-CPU MEM

  devm_alloc_percpu()

  devm_free_percpu()



PCI

PCI

  pcim_enable_device()	: after success, all PCI ops become managed

  pcim_enable_device()	: after success, all PCI ops become managed

  pcim_pin_device()	: keep PCI device enabled after release

  pcim_pin_device()	: keep PCI device enabled after release

drivers/base/devres.c

+66 −0
Original line number Original line Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/device.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/slab.h>

#include <linux/percpu.h>





#include "base.h"

#include "base.h"
@@ -985,3 +986,68 @@ void devm_free_pages(struct device *dev, unsigned long addr) 
			       &devres));

			       &devres));

}

}

EXPORT_SYMBOL_GPL(devm_free_pages);

EXPORT_SYMBOL_GPL(devm_free_pages);



static void devm_percpu_release(struct device *dev, void *pdata)

{

	void __percpu *p;



	p = *(void __percpu **)pdata;

	free_percpu(p);

}



static int devm_percpu_match(struct device *dev, void *data, void *p)

{

	struct devres *devr = container_of(data, struct devres, data);



	return *(void **)devr->data == p;

}



/**

 * __devm_alloc_percpu - Resource-managed alloc_percpu

 * @dev: Device to allocate per-cpu memory for

 * @size: Size of per-cpu memory to allocate

 * @align: Alignment of per-cpu memory to allocate

 *

 * Managed alloc_percpu. Per-cpu memory allocated with this function is

 * automatically freed on driver detach.

 *

 * RETURNS:

 * Pointer to allocated memory on success, NULL on failure.

 */

void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,

		size_t align)

{

	void *p;

	void __percpu *pcpu;



	pcpu = __alloc_percpu(size, align);

	if (!pcpu)

		return NULL;



	p = devres_alloc(devm_percpu_release, sizeof(void *), GFP_KERNEL);

	if (!p) {

		free_percpu(pcpu);

		return NULL;

	}



	*(void __percpu **)p = pcpu;



	devres_add(dev, p);



	return pcpu;

}

EXPORT_SYMBOL_GPL(__devm_alloc_percpu);



/**

 * devm_free_percpu - Resource-managed free_percpu

 * @dev: Device this memory belongs to

 * @pdata: Per-cpu memory to free

 *

 * Free memory allocated with devm_alloc_percpu().

 */

void devm_free_percpu(struct device *dev, void __percpu *pdata)

{

	WARN_ON(devres_destroy(dev, devm_percpu_release, devm_percpu_match,

			       (void *)pdata));

}

EXPORT_SYMBOL_GPL(devm_free_percpu);

include/linux/device.h

+19 −0
Original line number Original line Diff line number Diff line
@@ -698,6 +698,25 @@ static inline int devm_add_action_or_reset(struct device *dev, 
	return ret;

	return ret;

}

}





/**

 * devm_alloc_percpu - Resource-managed alloc_percpu

 * @dev: Device to allocate per-cpu memory for

 * @type: Type to allocate per-cpu memory for

 *

 * Managed alloc_percpu. Per-cpu memory allocated with this function is

 * automatically freed on driver detach.

 *

 * RETURNS:

 * Pointer to allocated memory on success, NULL on failure.

 */

#define devm_alloc_percpu(dev, type)      \

	((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \

						      __alignof__(type)))



void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,

				   size_t align);

void devm_free_percpu(struct device *dev, void __percpu *pdata);



struct device_dma_parameters {

struct device_dma_parameters {

	/*

	/*

	 * a low level driver may set these to teach IOMMU code about

	 * a low level driver may set these to teach IOMMU code about