From patchwork Wed Apr 16 06:51:24 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nam Cao X-Patchwork-Id: 14053368 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 C6DC9230BD1; Wed, 16 Apr 2025 06:52:03 +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=1744786326; cv=none; b=dy5eekq0QiUWCVZRFJr/RSLxamTZ4oo0WPd3gE56Mz+3O+8hD7rzjVCDd1G4Ai5LVj/P+z7Z9VES/IaFIgtgZIbbKlKz8ZW5RpTMDHF6E2jnsyBgHfGHRqWLeIFJwhHmTtGUYNt6jNJOqPz8O26bl+10qF2a5SZcPlGMX3v05ZA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744786326; c=relaxed/simple; bh=eX5oXC+HBcw1mu0TCAHq5i0a+I/QmsXUI8/vYm8odp4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aT20+WyXa4RgaSpLZ2/G17D1YFblZbRKr8TMiI/0kXEefbEayTLHxxQLBTG7Vv9x2BaB6ifnD4LmdvQRCY4vZS9qkiF8DidMuIAm3INfkbFnXiOE8Im52O15oA0kJUb76ZgJbnvqi03CfmWdBhfxP6Xe3KSk79uhHjP2fVdPh14= 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=H958wIR9; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=i/OToitF; 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="H958wIR9"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="i/OToitF" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1744786321; 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=GRN84yAGCbJ9jXd7YMFr0fN4dU5tvyZpKeky5D5bT9k=; b=H958wIR9PLkHkb713238ysuRUhy8dWcAsEMfNwVyp+RyMXi7mUAredOOicvlRXcAj1QXJW qnoK8fmJFG3uyrx94b2LCJJKMzJTa16fwehE9LKR+peepaDZ7tQ3HLVv0CplgOQdJmRJEB WjrO0dCu8VGYQp4mjk6J24wHSJ5CNz92vZeCMBv//+r7w6ORZ3WKQEQ/rN8gGZy/3RTLkr ejVxwvsMYTmvGvpLrWfwVc7YAB9Ng9yHFEexIBhIqrNCMZAvQoHNuw7O6pEKnAF3q0utXj ETXIKgo912IxNSNJAbl7qzkFU10Rz/ljBN8pwzmcmOTIdrIFQroiLVPZF1QJYQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1744786321; 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=GRN84yAGCbJ9jXd7YMFr0fN4dU5tvyZpKeky5D5bT9k=; b=i/OToitFEm7kOK0g/ck0LWolIRCuXJonphPolH6z0iWlr0tiBhcoMCdsOhoJATF+qqJ5pJ XeDPhi62Lcf+mvCA== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Alexandre Ghiti , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: [PATCH v3 18/22] riscv: mm: Add page fault trace points Date: Wed, 16 Apr 2025 08:51:24 +0200 Message-Id: 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 Acked-by: Alexandre Ghiti --- Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou 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.