diff options
author | Jean-Sébastien Pédron <dumbbell@FreeBSD.org> | 2022-11-11 20:40:57 +0300 |
---|---|---|
committer | Jean-Sébastien Pédron <dumbbell@FreeBSD.org> | 2022-11-11 20:40:57 +0300 |
commit | 0e5569a08cf02e036774235e54e1008a26167b36 (patch) | |
tree | 256af5c71bd7b7df643f1f32f1f3ffcca6cb78cf | |
parent | c9c1255012de441ec642b7521da4c9fbad40a839 (diff) |
linuxkpi: Add <linux/dma-buf-map.h>
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
-rw-r--r-- | sys/compat/linuxkpi/common/include/linux/dma-buf-map.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h b/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h new file mode 100644 index 000000000000..567ce3b072b3 --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h @@ -0,0 +1,91 @@ +/* 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 |