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LinuxKPI: add dmam_pool_create() support

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dmam_pool_create() is a "managed" version of dma_pool_create() which
will cleanup everything left when the device goes away using the
devres framework.  For that add an internal cleanup function to be
called from devres release.
This is used by at least one wireless driver.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D30520

(cherry picked from commit 2afeed13b5)
This commit is contained in:
Bjoern A. Zeeb 2021-05-28 11:11:28 +00:00
parent 05cb0d21ed
commit af13c69522
2 changed files with 30 additions and 0 deletions
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20
sys/compat/linuxkpi/common/include/linux/dmapool.h
View file

@ -41,6 +41,7 @@ struct dma_pool;
struct dma_pool *linux_dma_pool_create(char *name, struct device *dev,
size_t size, size_t align, size_t boundary);
void linux_dma_pool_destroy(struct dma_pool *pool);
void lkpi_dmam_pool_destroy(struct device *, void *);
void *linux_dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
dma_addr_t *handle);
void linux_dma_pool_free(struct dma_pool *pool, void *vaddr,
@ -54,6 +55,25 @@ dma_pool_create(char *name, struct device *dev, size_t size,
return (linux_dma_pool_create(name, dev, size, align, boundary));
}
static inline struct dma_pool *
dmam_pool_create(/* const */ char *name, struct device *dev, size_t size,
size_t align, size_t boundary)
{
struct dma_pool **pp;
pp = devres_alloc(lkpi_dmam_pool_destroy, sizeof(*pp), GFP_KERNEL);
if (pp == NULL)
return (NULL);
*pp = linux_dma_pool_create(name, dev, size, align, boundary);
if (*pp == NULL) {
devres_free(pp);
return (NULL);
}
devres_add(dev, pp);
return (*pp);
}
static inline void
dma_pool_destroy(struct dma_pool *pool)
{

10
sys/compat/linuxkpi/common/src/linux_pci.c
View file

@ -997,6 +997,16 @@ linux_dma_pool_destroy(struct dma_pool *pool)
kfree(pool);
}
void
lkpi_dmam_pool_destroy(struct device *dev, void *p)
{
struct dma_pool *pool;
pool = *(struct dma_pool **)p;
LINUX_DMA_PCTRIE_RECLAIM(&pool->pool_ptree);
linux_dma_pool_destroy(pool);
}
void *
linux_dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
dma_addr_t *handle)