From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f179.google.com (mail-pg1-f179.google.com [209.85.215.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5672E31D386 for ; Mon, 10 Nov 2025 16:38:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762792684; cv=none; b=oXAqS0YKkwEhLUnkIqio0yjdMdO0Cp/7Piq1t8dUvyZd4XIqKYRbg2PdXbqkByFEUtXeKXj5j5BxbA+FyOn8q9uo9flfiiMQymt7oPmsRdg0PmPD/ZO1i0r9QEdA7RmR+CLrbQREZDA4foKl8PFgWIGAUR93bZHrlT5Ut06gk9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762792684; c=relaxed/simple; bh=0ll1UY3KeG8rCRKq1wHdxRSPsRNrYLdVRTpppx6seVA=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QKE74WQ/Aj6fMPpXzWKwqwMQAKb3BnDbnPuVYwbVEZ/q7HDIE8hwWqRAK/w8Ib/W7q/col5vn3rUaJo1xMOsH7QznaxqjnENkLGAqdP+BGmw0RNR7UCrCvsrqrlgxDaYcOTCLOUS4Fgz1ied2ZNhKJomRjfg0xIti668hJE6Gn0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=A/IW2xSR; arc=none smtp.client-ip=209.85.215.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="A/IW2xSR" Received: by mail-pg1-f179.google.com with SMTP id 41be03b00d2f7-b99bfb451e5so2000253a12.2 for ; Mon, 10 Nov 2025 08:38:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762792682; x=1763397482; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=UVmErpKw40BYN09ToGb11RVmfMPSvvKFwxlIzoWfVWE=; b=A/IW2xSRULTfD2CUE6PiV3hO/VJS3mgcS4krXuQCnIyGCJ1hsaNXfw75NJeZvsGY0p gpj5JfYOCPp2KQZBAfgvxZoPBm8VSJBfW+uFcJBSohskV+NEKXIfY9oxP2/25hc4Hz2q ZZVgAZh7IdIWZdqm05FfXllJ9Ty1LFXIo6W7sAQvhi1C730hMh8XcZqBgP5wuUp8wDfE xuaWS/LSjLBZBX74X9tsbEJphqFqNEsgiR8m/tpdjTivhR9IrN7n3yCbKnXro8kb65hr aJMocx5EipF2Bp0jgC/rC2G2BbUQdE7Lf7WrvzEyKFpuRnMAVbQnXXoZ89jol3oIohAt W80w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762792682; x=1763397482; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=UVmErpKw40BYN09ToGb11RVmfMPSvvKFwxlIzoWfVWE=; b=VsaWjhrLYwEui6Z8kMPXWvHomsqpC5hCn1M1j3Wd1E3kMv27lCaVgKRiM/PhvM5bAA p1iwD7YTWhlZkmB0+z3BTrHZXpi2P4tBpx9aARBHjTcnKiuvSScYfIoWLBdVOJLu6QSg +mTk60fmeooO4oaawDOBxcpLByCGDLvUKODsjHr69WANNNo9IbtpatNO0WroybADSCGC txY2I80qCw2deHqr/1wlsvsMjXuCl5kIVHPqA64e3ffcvSnqDJFr8/ZmrtxQgZgO3COo w2pTBQBOcVtdpotWgwL4mv/57atSn/M2e6TPk8pmgFCGZfhBnS65EnP/FQMSPKZvRQlW fGTw== X-Forwarded-Encrypted: i=1; AJvYcCUUZXQcFl0hkZk+EmRprnVotrcfQc4/HTqU1GUZa3rMP+EywqJw06oyNn60Zde5kNC+AWvl49xh0e5pAZOF/lG8@vger.kernel.org X-Gm-Message-State: AOJu0YwlQbR8ZwEsqGUuT6DH73XpcZaVkeFfJg4I+LKyHmBDfm4whVo7 SYGm24qxKY/6hVC7DymIPzjCqQZ1zEAu/iJSne2zGA+54qxADY+572sU X-Gm-Gg: ASbGncsDVBUJjj4WaFPREJ6K2tPwGR4aw6ynsWWSC72BvlQAEp33D4uiEV/0Pj1/+aP fzHpf2qFJ816o3UYdMK4wgwEWjt/8XNQO2ErSLlkV/pQaFk5vo426krqLxjgVrsT32C/Qouwuk4 LDQhfM2fx3rhNxsu8k+o2hsGWR2yZjKWUoRrVkVks0w4e1WYzkCPkziJw+j8E9c1G/UOclPaA2q CNtbNdYg8zCG7O9Jx20nF+5abh7AAX8Q2RhE8dAymZ/eOFQn/SfMwaIn3BT0PlKMFj+Ne3a4dAl owxpuluCJjTqsL5H4FlUQ77A5eOETmUpSxri1EMw+pnJ+dEDaufVjUwKEY1BHRwAuhFWNU3f0E8 rUqzPyg9uVw8MZltzsRMicUQbB/mxeMkoIxNrZ+HaPT0YjTH7jT96Dzs4yaa6Wp97OT+bk/3dFl 8JkACOcVsL6z2wTn7iwhjXzkhAtHN4zEF2 X-Google-Smtp-Source: AGHT+IF4UnHu4G9Q8eIDvf2W+ctzcOIuGaDk8UK6CDWVqUsSsFW88QwW7PGjK89tTce0NP7TNVfhnw== X-Received: by 2002:a17:902:da4b:b0:297:dfae:1524 with SMTP id d9443c01a7336-297e56473f1mr131374835ad.16.1762792681587; Mon, 10 Nov 2025 08:38:01 -0800 (PST) Received: from localhost ([103.88.46.62]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651c8ef47sm153049485ad.74.2025.11.10.08.38.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 08:38:01 -0800 (PST) From: Jinchao Wang To: Andrew Morton , "Masami Hiramatsu (Google)" , Peter Zijlstra , Randy Dunlap , Marco Elver , Mike Rapoport , Alexander Potapenko , Adrian Hunter , Alexander Shishkin , Alice Ryhl , Andrey Konovalov , Andrey Ryabinin , Andrii Nakryiko , Ard Biesheuvel , Arnaldo Carvalho de Melo , Ben Segall , Bill Wendling , Borislav Petkov , Catalin Marinas , Dave Hansen , David Hildenbrand , David Kaplan , "David S. Miller" , Dietmar Eggemann , Dmitry Vyukov , "H. Peter Anvin" , Ian Rogers , Ingo Molnar , James Clark , Jinchao Wang , Jinjie Ruan , Jiri Olsa , Jonathan Corbet , Juri Lelli , Justin Stitt , kasan-dev@googlegroups.com, Kees Cook , "Liam R. Howlett" , "Liang Kan" , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev, Lorenzo Stoakes , Mark Rutland , Masahiro Yamada , Mathieu Desnoyers , Mel Gorman , Michal Hocko , Miguel Ojeda , Nam Cao , Namhyung Kim , Nathan Chancellor , Naveen N Rao , Nick Desaulniers , Rong Xu , Sami Tolvanen , Steven Rostedt , Suren Baghdasaryan , Thomas Gleixner , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Valentin Schneider , Vincent Guittot , Vincenzo Frascino , Vlastimil Babka , Will Deacon , workflows@vger.kernel.org, x86@kernel.org Subject: [PATCH v8 18/27] arm64/hw_breakpoint: Add arch_reinstall_hw_breakpoint Date: Tue, 11 Nov 2025 00:36:13 +0800 Message-ID: <20251110163634.3686676-19-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251110163634.3686676-1-wangjinchao600@gmail.com> References: <20251110163634.3686676-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add arch_reinstall_hw_breakpoint() to restore a hardware breakpoint in an atomic context. Unlike the full uninstall and reallocation path, this lightweight function re-establishes an existing breakpoint efficiently and safely. This aligns ARM64 with x86 support for atomic breakpoint reinstalls. --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/hw_breakpoint.h | 1 + arch/arm64/kernel/hw_breakpoint.c | 5 +++++ 3 files changed, 7 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6663ffd23f25..fa35dfa2f5cc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -232,6 +232,7 @@ config ARM64 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && \ HW_PERF_EVENTS && HAVE_PERF_EVENTS_NMI select HAVE_HW_BREAKPOINT if PERF_EVENTS + select HAVE_REINSTALL_HW_BREAKPOINT if PERF_EVENTS select HAVE_IOREMAP_PROT select HAVE_IRQ_TIME_ACCOUNTING select HAVE_LIVEPATCH diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h index bd81cf17744a..6c98bbbc6aa6 100644 --- a/arch/arm64/include/asm/hw_breakpoint.h +++ b/arch/arm64/include/asm/hw_breakpoint.h @@ -119,6 +119,7 @@ extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, unsigned long val, void *data); extern int arch_install_hw_breakpoint(struct perf_event *bp); +extern int arch_reinstall_hw_breakpoint(struct perf_event *bp); extern void arch_uninstall_hw_breakpoint(struct perf_event *bp); extern void hw_breakpoint_pmu_read(struct perf_event *bp); extern int hw_breakpoint_slots(int type); diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c index ab76b36dce82..bd7d23d7893d 100644 --- a/arch/arm64/kernel/hw_breakpoint.c +++ b/arch/arm64/kernel/hw_breakpoint.c @@ -292,6 +292,11 @@ int arch_install_hw_breakpoint(struct perf_event *bp) return hw_breakpoint_control(bp, HW_BREAKPOINT_INSTALL); } +int arch_reinstall_hw_breakpoint(struct perf_event *bp) +{ + return hw_breakpoint_control(bp, HW_BREAKPOINT_RESTORE); +} + void arch_uninstall_hw_breakpoint(struct perf_event *bp) { hw_breakpoint_control(bp, HW_BREAKPOINT_UNINSTALL); -- 2.43.0