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LinuxKPI: dma-mapping: add dmam_alloc_coherent()

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Add the devres version dmam_alloc_coherent() of dma_alloc_coherent()
along with the ancillary free function.

Sponsored by:	The FreeBSD Foundation
MFC after:	7 days
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D36661
This commit is contained in:
Bjoern A. Zeeb 2022-09-21 20:58:05 +00:00
parent f9f4988dc4
commit 7105f0d967
2 changed files with 49 additions and 0 deletions
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10
sys/compat/linuxkpi/common/include/linux/dma-mapping.h
View File

@ -95,6 +95,8 @@ int linux_dma_tag_init(struct device *, u64);
int linux_dma_tag_init_coherent(struct device *, u64);
void *linux_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
void *linuxkpi_dmam_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
dma_addr_t linux_dma_map_phys(struct device *dev, vm_paddr_t phys, size_t len);
void linux_dma_unmap(struct device *dev, dma_addr_t dma_addr, size_t size);
int linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
@ -159,6 +161,14 @@ dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
return (dma_alloc_coherent(dev, size, dma_handle, flag | __GFP_ZERO));
}
static inline void *
dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
return (linuxkpi_dmam_alloc_coherent(dev, size, dma_handle, flag));
}
static inline void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr)

39
sys/compat/linuxkpi/common/src/linux_pci.c
View File

@ -1139,6 +1139,45 @@ linux_dma_alloc_coherent(struct device *dev, size_t size,
return (mem);
}
struct lkpi_devres_dmam_coherent {
size_t size;
dma_addr_t *handle;
void *mem;
};
static void
lkpi_dmam_free_coherent(struct device *dev, void *p)
{
struct lkpi_devres_dmam_coherent *dr;
dr = p;
dma_free_coherent(dev, dr->size, dr->mem, *dr->handle);
}
void *
linuxkpi_dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
struct lkpi_devres_dmam_coherent *dr;
dr = lkpi_devres_alloc(lkpi_dmam_free_coherent,
sizeof(*dr), GFP_KERNEL | __GFP_ZERO);
if (dr == NULL)
return (NULL);
dr->size = size;
dr->mem = linux_dma_alloc_coherent(dev, size, dma_handle, flag);
dr->handle = dma_handle;
if (dr->mem == NULL) {
lkpi_devres_free(dr);
return (NULL);
}
lkpi_devres_add(dev, dr);
return (dr->mem);
}
void
linuxkpi_dma_sync(struct device *dev, dma_addr_t dma_addr, size_t size,
bus_dmasync_op_t op)