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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2022-11-22 15:39:12 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-12-27 12:52:12 +0100 |
| commit | 18c2355838e76788f61849f4d83513b103d68b95 (patch) | |
| tree | f9ef5c4c3601216cf1ecfc029d14cc5a59e7cc26 /tools/testing/selftests/rseq | |
| parent | 72cb1d7f2faca4fba81ab8417367d63852cd490c (diff) | |
| download | linux-stable-18c2355838e76788f61849f4d83513b103d68b95.tar.gz linux-stable-18c2355838e76788f61849f4d83513b103d68b95.tar.bz2 linux-stable-18c2355838e76788f61849f4d83513b103d68b95.zip | |
selftests/rseq: Implement rseq mm_cid field support
Add support for the mm_cid field (per-memory-map concurrency ID) of
struct rseq to rseq selftests.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-11-mathieu.desnoyers@efficios.com
Diffstat (limited to 'tools/testing/selftests/rseq')
| -rw-r--r-- | tools/testing/selftests/rseq/rseq-abi.h | 9 | ||||
| -rw-r--r-- | tools/testing/selftests/rseq/rseq.h | 10 |
2 files changed, 19 insertions, 0 deletions
diff --git a/tools/testing/selftests/rseq/rseq-abi.h b/tools/testing/selftests/rseq/rseq-abi.h index a1faa9162d52..fb4ec8a75dd4 100644 --- a/tools/testing/selftests/rseq/rseq-abi.h +++ b/tools/testing/selftests/rseq/rseq-abi.h @@ -156,6 +156,15 @@ struct rseq_abi { __u32 node_id; /* + * Restartable sequences mm_cid field. Updated by the kernel. Read by + * user-space with single-copy atomicity semantics. This field should + * only be read by the thread which registered this data structure. + * Aligned on 32-bit. Contains the current thread's concurrency ID + * (allocated uniquely within a memory map). + */ + __u32 mm_cid; + + /* * Flexible array member at end of structure, after last feature field. */ char end[]; diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h index fd17d0e54a1b..10ebf13644fa 100644 --- a/tools/testing/selftests/rseq/rseq.h +++ b/tools/testing/selftests/rseq/rseq.h @@ -191,6 +191,16 @@ static inline uint32_t rseq_current_node_id(void) return RSEQ_ACCESS_ONCE(rseq_get_abi()->node_id); } +static inline bool rseq_mm_cid_available(void) +{ + return (int) rseq_feature_size >= rseq_offsetofend(struct rseq_abi, mm_cid); +} + +static inline uint32_t rseq_current_mm_cid(void) +{ + return RSEQ_ACCESS_ONCE(rseq_get_abi()->mm_cid); +} + static inline void rseq_clear_rseq_cs(void) { RSEQ_WRITE_ONCE(rseq_get_abi()->rseq_cs.arch.ptr, 0); |