From patchwork Thu Jun 6 15:01:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 13688646 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 955BCC27C55 for ; Thu, 6 Jun 2024 15:03:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 302606B00A4; Thu, 6 Jun 2024 11:03:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2DA7D6B00A5; Thu, 6 Jun 2024 11:03:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 17CCE6B00A6; Thu, 6 Jun 2024 11:03:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id E75136B00A5 for ; Thu, 6 Jun 2024 11:03:17 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 29202A16B0 for ; Thu, 6 Jun 2024 15:03:17 +0000 (UTC) X-FDA: 82200782034.21.C885459 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf27.hostedemail.com (Postfix) with ESMTP id 06EF740032 for ; Thu, 6 Jun 2024 15:03:13 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf27.hostedemail.com: domain of "SRS0=WH+2=NI=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=WH+2=NI=goodmis.org=rostedt@kernel.org" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1717686194; 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=yzbXCWndsIXJjXp6XlDn7hZjYkCTqLwJsQto8+Nsa5Dd7kOIZv/E3r9dDXEFj7gNi9k4mE e0W0kL71mt/xp8MSLjVTS4DzcjjMMiWXn8i9KfBjqS7m+K2lVzKRi8tG08scz8KkguDF3K Y7cBxf2XzBB6gEnqkiOxxi1g8HRSgBA= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf27.hostedemail.com: domain of "SRS0=WH+2=NI=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=WH+2=NI=goodmis.org=rostedt@kernel.org" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1717686194; a=rsa-sha256; cv=none; b=imvNontBOJ5KXt9HHp5/kM9cGhQ0uYnf76xFDnAfnQH09lrbA2ZLzxJHVP7/A0Q75y4NL9 6XHKfSwfMqVxioblGjnoHWS4CJsQy7/6n+Q43ITwV7/YvOx2sB4u3aHI+aUpoVNcK940zI KnpFk5YVXOZHeW2ZeE6qKX2l2TM72KQ= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id BD5C861DF5; Thu, 6 Jun 2024 15:03:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42FC5C32782; Thu, 6 Jun 2024 15:03:12 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.97) (envelope-from ) id 1sFEe5-00000000oRl-0FPv; Thu, 06 Jun 2024 11:03:17 -0400 Message-ID: <20240606150316.916395285@goodmis.org> User-Agent: quilt/0.68 Date: Thu, 06 Jun 2024 11:01:45 -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 , Ard Biesheuvel Subject: [PATCH v2 2/2] pstore/ramoops: Add ramoops.mem_name= command line option References: <20240606150143.876469296@goodmis.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 06EF740032 X-Stat-Signature: ozeorb5rr49kmu1acsbygm4qwqqgbnrr X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1717686193-419245 X-HE-Meta: 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 7WSMzv4K Nsn4kmKXMluvKkXocFrv0UGk6z+f9LpcQIxnweHr0elio4wmZ/FCW56usKSj9un6dOVgNIb/z9kau9NMoEYHX4Al1STOmM5W32wW4k7HLZNCfO5IKujLdN6T+uUCuCUko6yf29ifNTvxj/BZqmS4RVpoVwpXvE03Di8+2iZ508ZYevtasa+IlkKj99PkdhKYEjymCMczr4wjO5aV5sc39gOfv2Uhn3SSfFuhyJ+jGG9X8xtdBwgxHlDdL6hEwWcGkqXUJ6cbGs0t0bDEXzqUFORmySc40niVehkdXfApV+2u3fbHCOkYVB2yUhMCx9gFKt43P89pW3BcoeR1zubyDmBQr6nK2NZ0qBoCghLm3NOJToVqy0yRH5AATukDBckpGWhO8DOl9kFI5Qs4= 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