Date: Mon, 20 Apr 2026 17:42:49 +0000 From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: aaa10396a997 - main - membarrier(2): implement the MEMBARRIER_CMD_GET_REGISTRATIONS command Message-ID: <69e66599.41ab7.6d150451@gitrepo.freebsd.org>
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The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=aaa10396a997bafc28ce6551e92563620caf3df4 commit aaa10396a997bafc28ce6551e92563620caf3df4 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2026-04-18 18:43:59 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2026-04-20 17:42:28 +0000 membarrier(2): implement the MEMBARRIER_CMD_GET_REGISTRATIONS command Reported by: Ricardo Branco <rbranco@suse.com> Reviewed by: markj, Ricardo Branco <rbranco@suse.com> Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D56507 --- sys/kern/kern_membarrier.c | 20 +++++++++++++++++--- sys/sys/membarrier.h | 3 +++ 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/sys/kern/kern_membarrier.c b/sys/kern/kern_membarrier.c index 6d210a1b1783..0c8f4b843473 100644 --- a/sys/kern/kern_membarrier.c +++ b/sys/kern/kern_membarrier.c @@ -51,7 +51,8 @@ MEMBARRIER_CMD_PRIVATE_EXPEDITED | \ MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED | \ MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE | \ - MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE) + MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE | \ + MEMBARRIER_CMD_GET_REGISTRATIONS) static void membarrier_action_seqcst(void *arg __unused) @@ -120,7 +121,7 @@ kern_membarrier(struct thread *td, int cmd, unsigned flags, int cpu_id) struct thread *td1; cpuset_t cs; uint64_t *swt; - int c, error, f; + int c, error, f, res; bool first; if (flags != 0 || (cmd & ~MEMBARRIER_SUPPORTED_CMDS) != 0) @@ -218,13 +219,26 @@ kern_membarrier(struct thread *td, int cmd, unsigned flags, int cpu_id) break; case MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE: - if ((p->p_flag2 & P2_MEMBAR_PRIVE_SYNCORE) == 0) { + if ((f & P2_MEMBAR_PRIVE_SYNCORE) == 0) { PROC_LOCK(p); p->p_flag2 |= P2_MEMBAR_PRIVE_SYNCORE; PROC_UNLOCK(p); } break; + case MEMBARRIER_CMD_GET_REGISTRATIONS: + res = 0; + if ((f & P2_MEMBAR_GLOBE) != 0) + res |= MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED; + if ((f & P2_MEMBAR_PRIVE) != 0) + res |= MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED; + if ((f & P2_MEMBAR_PRIVE_SYNCORE) != 0) { + res |= + MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE; + } + td->td_retval[0] = res; + break; + default: error = EINVAL; break; diff --git a/sys/sys/membarrier.h b/sys/sys/membarrier.h index 31a605634ddb..34a525dabae6 100644 --- a/sys/sys/membarrier.h +++ b/sys/sys/membarrier.h @@ -55,6 +55,9 @@ enum membarrier_cmd { */ MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ = 0x00000080, MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ = 0x00000100, + + /* Return the bitmask of current registrations. */ + MEMBARRIER_CMD_GET_REGISTRATIONS = 0x00000200, }; enum membarrier_cmd_flag {home | help
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