From patchwork Mon Jun 3 23:33:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 13684472 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E386CC25B78 for ; Mon, 3 Jun 2024 23:35:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 500086B0099; Mon, 3 Jun 2024 19:35:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4AF4F6B009B; Mon, 3 Jun 2024 19:35:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3C55B6B009C; Mon, 3 Jun 2024 19:35:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 1F85D6B0099 for ; Mon, 3 Jun 2024 19:35:24 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 919C01409AB for ; Mon, 3 Jun 2024 23:35:23 +0000 (UTC) X-FDA: 82191186126.29.4E9DB6A Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf06.hostedemail.com (Postfix) with ESMTP id EF313180004 for ; Mon, 3 Jun 2024 23:35:21 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf06.hostedemail.com: domain of "SRS0=/hzC=NF=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=/hzC=NF=goodmis.org=rostedt@kernel.org" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1717457722; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding:in-reply-to: references:references; bh=fxYNEtFY57+BQyPLPV1MGH4b/IDbzLgDWasHCXE8Ccc=; b=zDgeSMsA4eM4V8LlKUutv+StEXPxqzhwX6p1Gi4eFUzIxf+pOL7pH8JvDOmbZjn++m+GJ0 XEjt0bS2m2dqK7mUfk+ZqaHKx+yvkvqV9yQbMZhXkK61u5epJ5ePG7+1Buhx7nRE3E0b/Q 4vYLhtEkXBpZ1qRLfiUqlSnn+Heje3U= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf06.hostedemail.com: domain of "SRS0=/hzC=NF=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=/hzC=NF=goodmis.org=rostedt@kernel.org" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1717457722; a=rsa-sha256; cv=none; b=udeZUbVLmPiONEJ8/cJW/Awvfn9XHIIQw7yaw2RHz169+PjVDXGNuFFQvGIMwfLs//EPEe jDqMlnenvw8t4eFTc14+slw7xEkXKVc11UszH1DuuCWzeLB1r09PiRoGnvPWjw4vXoOEIx ynn9n8vYfIoGf/yAWhCGXA8r+/T9EEc= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id CAB80611C8; Mon, 3 Jun 2024 23:35:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 681D3C4AF0F; Mon, 3 Jun 2024 23:35:20 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.97) (envelope-from ) id 1sEHE7-00000009cvy-3A89; Mon, 03 Jun 2024 19:36:31 -0400 Message-ID: <20240603233631.619438489@goodmis.org> User-Agent: quilt/0.68 Date: Mon, 03 Jun 2024 19:33:32 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Kees Cook , Tony Luck , "Guilherme G. Piccoli" , linux-hardening@vger.kernel.org, Guenter Roeck , Ross Zwisler , wklin@google.com, Vineeth Remanan Pillai , Joel Fernandes , Suleiman Souhlal , Linus Torvalds , Catalin Marinas , Will Deacon Subject: [PATCH 2/2] pstore/ramoops: Add ramoops.mem_name= command line option References: <20240603233330.801075898@goodmis.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: EF313180004 X-Stat-Signature: rh47w8nshno8f1hwrts4bi8f5th495sk X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1717457721-53906 X-HE-Meta: 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 J/2xNAZJ jOJ8ZHDvCYmMqKktGc0au4Wk2pnl/FNG9zghp/c5tkVbiATb8rRcq2GukGVHNOIS1wlVy+7bnLh/K5XDtP7BomraDptLfddRg6qH35kYKL3PMp/psZyjBFkOSAziEIK3e/CMBjC3SESHpi16/52Xlr8fmC+0bGFz7ihe806r32DnTMigPaWxwXScqZsQV7nNMGlbkINhkrZy4kjond9i3AEUZdU2G60O9c6Bm1rRVEDBvqIzvgYxsCYavy82TTS1YHdfA57rEKFBiG43YNWsS9Vk+UJbnWuX9ZVLqqA3JLR1c7eIW+bgLrmgUDuIAu3J2WimpspT+JF9NL71oYx+553MuE41PEWMfSybA1m/ZRCVa0R9q5hedt2CSaeu/ve/xCbGLRHIzgqHZfaPqNgubJh0jLw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Steven Rostedt (Google)" Add a method to find a region specified by reserve_mem=nn:align:name for ramoops. Adding a kernel command line parameter: reserve_mem=12M:4096:oops ramoops.mem_name=oops Will use the size and location defined by the memmap parameter where it finds the memory and labels it "oops". The "oops" in the ramoops option is used to search for it. This allows for arbitrary RAM to be used for ramoops if it is known that the memory is not cleared on kernel crashes or soft reboots. Signed-off-by: Steven Rostedt (Google) --- fs/pstore/ram.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index b1a455f42e93..bae8486045eb 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -50,6 +50,11 @@ module_param_hw(mem_address, ullong, other, 0400); MODULE_PARM_DESC(mem_address, "start of reserved RAM used to store oops/panic logs"); +static char *mem_name; +module_param_named(mem_name, mem_name, charp, 0400); +MODULE_PARM_DESC(mem_name, + "name of kernel param that holds addr (builtin only)"); + static ulong mem_size; module_param(mem_size, ulong, 0400); MODULE_PARM_DESC(mem_size, @@ -914,6 +919,16 @@ static void __init ramoops_register_dummy(void) { struct ramoops_platform_data pdata; + if (mem_name) { + unsigned long start; + unsigned long size; + + if (reserve_mem_find_by_name(mem_name, &start, &size)) { + mem_address = start; + mem_size = size; + } + } + /* * Prepare a dummy platform data structure to carry the module * parameters. If mem_size isn't set, then there are no module