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linuxkpi: Add <linux/dma-buf-map.h>

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I took the implementation from OpenBSD, commit
d55ef580b1748517027c3eabdb715316ca5b1442.

The only difference is the addition of `dma_buf_map_is_equal()`.

Reviewed by:	manu
Approved by:	manu
Differential Revision:	https://reviews.freebsd.org/D36963
This commit is contained in:
Jean-Sébastien Pédron 2022-11-11 18:40:57 +01:00
parent c9c1255012
commit 0e5569a08c
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1 changed files with 91 additions and 0 deletions
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91
sys/compat/linuxkpi/common/include/linux/dma-buf-map.h Normal file
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/* Public domain. */
#ifndef _LINUX_DMA_BUF_MAP_H
#define _LINUX_DMA_BUF_MAP_H
#include <linux/io.h>
#include <linux/string.h>
struct dma_buf_map {
union {
void *vaddr_iomem;
void *vaddr;
};
bool is_iomem;
};
static inline void
dma_buf_map_incr(struct dma_buf_map *dbm, size_t n)
{
if (dbm->is_iomem)
dbm->vaddr_iomem += n;
else
dbm->vaddr += n;
}
static inline void
dma_buf_map_memcpy_to(struct dma_buf_map *dbm, const void *src, size_t len)
{
if (dbm->is_iomem)
memcpy_toio(dbm->vaddr_iomem, src, len);
else
memcpy(dbm->vaddr, src, len);
}
static inline bool
dma_buf_map_is_null(const struct dma_buf_map *dbm)
{
if (dbm->is_iomem)
return (dbm->vaddr_iomem == NULL);
else
return (dbm->vaddr == NULL);
}
static inline bool
dma_buf_map_is_set(const struct dma_buf_map *dbm)
{
if (dbm->is_iomem)
return (dbm->vaddr_iomem != NULL);
else
return (dbm->vaddr != NULL);
}
static inline bool
dma_buf_map_is_equal(
const struct dma_buf_map *dbm_a, const struct dma_buf_map *dbm_b)
{
if (dbm_a->is_iomem != dbm_b->is_iomem)
return (false);
if (dbm_a->is_iomem)
return (dbm_a->vaddr_iomem == dbm_b->vaddr_iomem);
else
return (dbm_a->vaddr == dbm_b->vaddr);
}
static inline void
dma_buf_map_clear(struct dma_buf_map *dbm)
{
if (dbm->is_iomem) {
dbm->vaddr_iomem = NULL;
dbm->is_iomem = false;
} else {
dbm->vaddr = NULL;
}
}
static inline void
dma_buf_map_set_vaddr_iomem(struct dma_buf_map *dbm, void *addr)
{
dbm->vaddr_iomem = addr;
dbm->is_iomem = true;
}
static inline void
dma_buf_map_set_vaddr(struct dma_buf_map *dbm, void *addr)
{
dbm->vaddr = addr;
dbm->is_iomem = false;
}
#endif