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| author | Will Deacon | 2019-02-22 13:48:44 +0100 |
|---|---|---|
| committer | Will Deacon | 2019-04-08 12:59:39 +0200 |
| commit | d1be6a28b13ce6d1bc42bf9b6a9454c65839225b (patch) | |
| tree | 320fd6244998529491991e7012ebfc5dd9709d4a /include/asm-generic/mmiowb_types.h | |
| parent | docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER EFFECTS" section (diff) | |
| download | kernel-qcow2-linux-d1be6a28b13ce6d1bc42bf9b6a9454c65839225b.tar.gz kernel-qcow2-linux-d1be6a28b13ce6d1bc42bf9b6a9454c65839225b.tar.xz kernel-qcow2-linux-d1be6a28b13ce6d1bc42bf9b6a9454c65839225b.zip | |
asm-generic/mmiowb: Add generic implementation of mmiowb() tracking
In preparation for removing all explicit mmiowb() calls from driver
code, implement a tracking system in asm-generic based loosely on the
PowerPC implementation. This allows architectures with a non-empty
mmiowb() definition to have the barrier automatically inserted in
spin_unlock() following a critical section containing an I/O write.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/asm-generic/mmiowb_types.h')
| -rw-r--r-- | include/asm-generic/mmiowb_types.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-generic/mmiowb_types.h b/include/asm-generic/mmiowb_types.h new file mode 100644 index 000000000000..8eb0095655e7 --- /dev/null +++ b/include/asm-generic/mmiowb_types.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_GENERIC_MMIOWB_TYPES_H +#define __ASM_GENERIC_MMIOWB_TYPES_H + +#include <linux/types.h> + +struct mmiowb_state { + u16 nesting_count; + u16 mmiowb_pending; +}; + +#endif /* __ASM_GENERIC_MMIOWB_TYPES_H */ |