Commit c8223107 authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

lib: devres: Add managed arch_io_reserve_memtype_wc() 



Add devm_arch_io_reserve_memtype_wc() as managed wrapper around
arch_io_reserve_memtype_wc(). Useful for several graphics drivers
that set framebuffer memory to write combining.

v2:
	* fix typo in commit description

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210916181601.9146-3-tzimmermann@suse.de
parent 3229b906

include/linux/io.h

+3 −0
Original line number Diff line number Diff line
@@ -168,4 +168,7 @@ static inline void arch_io_free_memtype_wc(resource_size_t base, 
}

#endif



int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,

				    resource_size_t size);



#endif /* _LINUX_IO_H */

lib/devres.c

+46 −0
Original line number Diff line number Diff line
@@ -564,3 +564,49 @@ int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long 
	return ret;

}

EXPORT_SYMBOL(devm_arch_phys_wc_add);



struct arch_io_reserve_memtype_wc_devres {

	resource_size_t start;

	resource_size_t size;

};



static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)

{

	const struct arch_io_reserve_memtype_wc_devres *this = res;



	arch_io_free_memtype_wc(this->start, this->size);

}



/**

 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()

 * @dev: Managed device

 * @start: Memory base address

 * @size: Size of memory range

 *

 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()

 * and sets up a release callback See arch_io_reserve_memtype_wc() for more

 * information.

 */

int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,

				    resource_size_t size)

{

	struct arch_io_reserve_memtype_wc_devres *dr;

	int ret;



	dr = devres_alloc(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL);

	if (!dr)

		return -ENOMEM;



	ret = arch_io_reserve_memtype_wc(start, size);

	if (ret < 0) {

		devres_free(dr);

		return ret;

	}



	dr->start = start;

	dr->size = size;

	devres_add(dev, dr);



	return ret;

}

EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);