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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: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210916181601.9146-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-09-16 20:15:58 +02:00
parent 3229b906fb
commit c822310725
2 changed files with 49 additions and 0 deletions
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3
include/linux/io.h
View File

@ -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 */

46
lib/devres.c
View File

@ -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);