From patchwork Tue Mar 11 17:05:09 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nam Cao X-Patchwork-Id: 14012370 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8239C262804; Tue, 11 Mar 2025 17:05:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741712733; cv=none; b=lBa54doUqgTRmJuvURfLREtLIl273eNVp5feZaiECK1xIGKXUzl26762guEHZvabY1MdPkr3mLocfeqTeYzscUlw/11D42/9S1ejgznZtvlBmttHT0VICxVsfaU44QX7C80w6nf0yAWmhR5QFbeKAMmfc5ANOmnbbqgdPTcDkiU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741712733; c=relaxed/simple; bh=Jq8ZQ0IhQ1yxtum3q/maWSWSnAIIZHjCL3LXJsYa63Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rnDEQzKz3MXxzqzyU6rR5cdV6EOD5ZZBYQFnHBBG5Pn/5fG4T1LD3QtMlk8dusMy/uwEaxZtCLUZG/7nSRPYBMqnhhFkm472c18OFfENq01QS/kGL2VmlhIN2cNnwtf1vm5E1UqXG6iMzYMO2bHStZQzioRL7Uv4ajU5qzrqkK4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ucOxcmo7; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=R5Bt5FmJ; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ucOxcmo7"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="R5Bt5FmJ" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1741712729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eXShVdGyHkymBrWxSB5AB2Yn4Vhhr4p3inDGKP7lxQo=; b=ucOxcmo7pEPwLOMGH7ybPgvjYUP/Y4xGR5SiB3jj/JBwJNlD+UccQbnovZXYlhW817Myit 2jU86mFch5dc5nautbPZJCwOqTTBgJtWnLGGLxjSRsV89yFJf65ZQ6qXmy6bCJLBxYpuVE KxATNAu2yKbBq/xeFBi3pdyqQSC5//+xj/2ryCEOpiCdPQAng10Bwb+rbk/2Ixy8os90PP 1rPe2Q6I67Nv7ljX6Sf0bmq4WBqgMfHv0JYjB1pcoDHnBslVQhn99hSkh/VgSUamd8oMpi u3z/j44cXQjeeTN6nlXf2BH2LfLke52vGCRSjWj/AZjNoquXDE3aW6Ns5owV0Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1741712729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eXShVdGyHkymBrWxSB5AB2Yn4Vhhr4p3inDGKP7lxQo=; b=R5Bt5FmJjoZpm+N1aXSQOGGFhU1AyycnUhZhcJsDD75Hk7fUKjaNBCBSe1aYf6P0hE2/N3 gkwbrceCot64dkCw== To: Steven Rostedt , Gabriele Monaco , john.ogness@linutronix.de, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Nam Cao , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , linux-riscv@lists.infradead.org Subject: [PATCH 08/10] riscv: mm: Add page fault trace points Date: Tue, 11 Mar 2025 18:05:09 +0100 Message-Id: <672e2bed604c307c807f546627ba5a9454ef10eb.1741708239.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add page fault trace points, which are useful to implement RV monitor that watches page faults. Signed-off-by: Nam Cao --- Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: linux-riscv@lists.infradead.org --- arch/riscv/mm/fault.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 0194324a0c50..04ed6f8acae4 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -20,6 +20,9 @@ #include #include +#define CREATE_TRACE_POINTS +#include + #include "../kernel/head.h" static void show_pte(unsigned long addr) @@ -291,6 +294,11 @@ void handle_page_fault(struct pt_regs *regs) if (kprobe_page_fault(regs, cause)) return; + if (user_mode(regs)) + trace_page_fault_user(addr, regs, cause); + else + trace_page_fault_kernel(addr, regs, cause); + /* * Fault-in kernel-space virtual memory on-demand. * The 'reference' page table is init_mm.pgd.