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iosys-map: Add per-word write

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Like was done for read, provide the equivalent for write. Even if
current users are not in the hot path, this should future-proof it.

v2:
  - Remove default from _Generic() - callers wanting to write more
    than u64 should use iosys_map_memcpy_to()
  - Add WRITE_ONCE() cases dereferencing the pointer when using system
    memory
v3:
  - Fix precedence issue when casting inside WRITE_ONCE(). By not using ()
    around vaddr__ the offset was not part of the cast, but rather added
    to it, producing a wrong address
  - Remove compiletime_assert() as WRITE_ONCE() already contains it

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Reviewed-by: Christian König <christian.koenig@amd.com> # v1
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220628191016.3899428-2-lucas.demarchi@intel.com
This commit is contained in:
Lucas De Marchi 2022-06-28 12:10:16 -07:00
parent 5f278dbd54
commit 6fb5ee7cec
1 changed files with 29 additions and 9 deletions
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38
include/linux/iosys-map.h
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@ -337,9 +337,13 @@ static inline void iosys_map_memset(struct iosys_map *dst, size_t offset,
#ifdef CONFIG_64BIT
#define __iosys_map_rd_io_u64_case(val_, vaddr_iomem_) \
u64: val_ = readq(vaddr_iomem_)
#define __iosys_map_wr_io_u64_case(val_, vaddr_iomem_) \
u64: writeq(val_, vaddr_iomem_)
#else
#define __iosys_map_rd_io_u64_case(val_, vaddr_iomem_) \
u64: memcpy_fromio(&(val_), vaddr_iomem_, sizeof(u64))
#define __iosys_map_wr_io_u64_case(val_, vaddr_iomem_) \
u64: memcpy_toio(vaddr_iomem_, &(val_), sizeof(u64))
#endif
#define __iosys_map_rd_io(val__, vaddr_iomem__, type__) _Generic(val__, \
@ -351,6 +355,15 @@ static inline void iosys_map_memset(struct iosys_map *dst, size_t offset,
#define __iosys_map_rd_sys(val__, vaddr__, type__) \
val__ = READ_ONCE(*(type__ *)(vaddr__))
#define __iosys_map_wr_io(val__, vaddr_iomem__, type__) _Generic(val__, \
u8: writeb(val__, vaddr_iomem__), \
u16: writew(val__, vaddr_iomem__), \
u32: writel(val__, vaddr_iomem__), \
__iosys_map_wr_io_u64_case(val__, vaddr_iomem__))
#define __iosys_map_wr_sys(val__, vaddr__, type__) \
WRITE_ONCE(*(type__ *)(vaddr__), val__)
/**
* iosys_map_rd - Read a C-type value from the iosys_map
*
@ -383,12 +396,17 @@ static inline void iosys_map_memset(struct iosys_map *dst, size_t offset,
* @type__: Type of the value being written
* @val__: Value to write
*
* Write a C-type value to the iosys_map, handling possible un-aligned accesses
* to the mapping.
* Write a C type value (u8, u16, u32 and u64) to the iosys_map. For other types
* or if pointer may be unaligned (and problematic for the architecture
* supported), use iosys_map_memcpy_to()
*/
#define iosys_map_wr(map__, offset__, type__, val__) ({ \
type__ val = (val__); \
iosys_map_memcpy_to(map__, offset__, &val, sizeof(val)); \
#define iosys_map_wr(map__, offset__, type__, val__) ({ \
type__ val = (val__); \
if ((map__)->is_iomem) { \
__iosys_map_wr_io(val, (map__)->vaddr_iomem + (offset__), type__);\
} else { \
__iosys_map_wr_sys(val, (map__)->vaddr + (offset__), type__); \
} \
})
/**
@ -469,10 +487,12 @@ static inline void iosys_map_memset(struct iosys_map *dst, size_t offset,
* @field__: Member of the struct to read
* @val__: Value to write
*
* Write a value to the iosys_map considering its layout is described by a C struct
* starting at @struct_offset__. The field offset and size is calculated and the
* @val__ is written handling possible un-aligned memory accesses. Refer to
* iosys_map_rd_field() for expected usage and memory layout.
* Write a value to the iosys_map considering its layout is described by a C
* struct starting at @struct_offset__. The field offset and size is calculated
* and the @val__ is written. If the field access would incur in un-aligned
* access, then either iosys_map_memcpy_to() needs to be used or the
* architecture must support it. Refer to iosys_map_rd_field() for expected
* usage and memory layout.
*/
#define iosys_map_wr_field(map__, struct_offset__, struct_type__, field__, val__) ({ \
struct_type__ *s; \