From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95CB2C4321E for ; Tue, 22 Nov 2022 20:40:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234650AbiKVUkA (ORCPT ); Tue, 22 Nov 2022 15:40:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234894AbiKVUjw (ORCPT ); Tue, 22 Nov 2022 15:39:52 -0500 Received: from smtpout.efficios.com (unknown [IPv6:2607:5300:203:b2ee::31e5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD189697E8; Tue, 22 Nov 2022 12:39:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1669149588; bh=Ittf5/h2eFHZsvkRxlERVQgY2E4qLD49CL1ob0scu/M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QB29dn3YuH5o+c6C31/1e3b2Qv5Zd357TgCdWqBctDiK0bT0DofRffW1hU0ho+/lF tQy6uhTXy/dfVXEJx7SSmFzzi9NW2K2jG+6BhpO1MCWqHsJz0d+ht5b3eMsVALHY1u AcVelrcrHog+ucXcj0FucEJKVcDQvS+zhZ7zj1iKI6QuDuZfBw+rTl9QN1iytiGcp9 G3amSCVSd/OaWU7PpiZJ074mPAyqEysg532AQr79Vn1/TLEDYKjx2Z3yqLqDWwqL5F XCdS05wtOBDZ6ymztvEVTET/ASRO3PH6ZygVxtc81w9++NE7d1KqbK6taxApFw/mb0 D7XyqlGgBwsZw== Received: from localhost.localdomain (192-222-180-24.qc.cable.ebox.net [192.222.180.24]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4NGx2X1RYPzXLR; Tue, 22 Nov 2022 15:39:48 -0500 (EST) From: Mathieu Desnoyers To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E . McKenney" , Boqun Feng , "H . Peter Anvin" , Paul Turner , linux-api@vger.kernel.org, Christian Brauner , Florian Weimer , David.Laight@ACULAB.COM, carlos@redhat.com, Peter Oskolkov , Alexander Mikhalitsyn , Chris Kennelly , Mathieu Desnoyers Subject: [PATCH 10/30] selftests/rseq: Implement rseq mm_cid field support Date: Tue, 22 Nov 2022 15:39:12 -0500 Message-Id: <20221122203932.231377-11-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221122203932.231377-1-mathieu.desnoyers@efficios.com> References: <20221122203932.231377-1-mathieu.desnoyers@efficios.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org Add support for the mm_cid field (per-memory-map concurrency ID) of struct rseq to rseq selftests. Signed-off-by: Mathieu Desnoyers --- tools/testing/selftests/rseq/rseq-abi.h | 9 +++++++++ tools/testing/selftests/rseq/rseq.h | 10 ++++++++++ 2 files changed, 19 insertions(+) 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 @@ -155,6 +155,15 @@ 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. */ 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); -- 2.25.1