From patchwork Tue Mar 1 04:29:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiezhu Yang X-Patchwork-Id: 12764060 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C73AC433EF for ; Tue, 1 Mar 2022 04:29:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232339AbiCAE3w (ORCPT ); Mon, 28 Feb 2022 23:29:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231896AbiCAE3u (ORCPT ); Mon, 28 Feb 2022 23:29:50 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8F9DB4D610; Mon, 28 Feb 2022 20:29:08 -0800 (PST) Received: from linux.localdomain (unknown [113.200.148.30]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9Bx4M4NoR1iUhoAAA--.595S5; Tue, 01 Mar 2022 12:29:02 +0800 (CST) From: Tiezhu Yang To: Thomas Bogendoerfer , Mike Rapoport , Andrew Morton Cc: Xuefeng Li , linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 3/4] MIPS: Refactor early_parse_memmap() to fix memmap= parameter Date: Tue, 1 Mar 2022 12:29:00 +0800 Message-Id: <1646108941-27919-4-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1646108941-27919-1-git-send-email-yangtiezhu@loongson.cn> References: <1646108941-27919-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf9Bx4M4NoR1iUhoAAA--.595S5 X-Coremail-Antispam: 1UD129KBjvJXoWxCF17tw4rKFW8Ar18GrWkXrb_yoWrXw1rpr 1furWakr48tF9rJFyftr1ku345Aw1vkF4UGa42krn5Awn8Gr1UA348WFW7KFyaqryUJ3Wj qFs8tFy09wsFkw7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBa14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JrWl82xGYIkIc2 x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1l84 ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AI xVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20x vE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xv r2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxkIecxEwVAFwVW8XwCF04k20x vY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I 3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIx AIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAI cVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2js IEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUTHq7UUUUU= X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org According to Documentation/admin-guide/kernel-parameters.txt, the kernel command-line parameter memmap= means "Force usage of a specific region of memory", but when add "memmap=3G@64M" to the command-line, kernel boot hangs in sparse_init(). In order to support memmap=limit@base, refactor the function early_parse_memmap() and then use memblock_mem_range_remove_map() to limit the memory region. With this patch, when add "memmap=3G@64M" to the command-line, the kernel boots successfully, we can see the following messages: [ 0.000000] Memory limited to 64MB-3136MB ... [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000004000000-0x000000000effffff] [ 0.000000] node 0: [mem 0x0000000090200000-0x00000000ffffffff] [ 0.000000] node 0: [mem 0x0000000120000000-0x00000001653fffff] ... [ 0.000000] Memory: 3070816K/3147776K available (...) When add "memmap=128M@64M nr_cpus=1 init 3" to the command-line, the kernel also boots successfully, we can see the following messages: [ 0.000000] Memory limited to 64MB-192MB ... [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000004000000-0x000000000c1fffff] ... [ 0.000000] Memory: 95312K/133120K available (...) After login, the output of free command is consistent with the above log. Signed-off-by: Tiezhu Yang --- arch/mips/kernel/setup.c | 40 ++++++++++++++++++++++++---------------- 1 file changed, 24 insertions(+), 16 deletions(-) diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index 50396ba..30c7d95 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -340,6 +340,7 @@ static void __init bootmem_init(void) static int usermem __initdata; static phys_addr_t memory_limit; +static phys_addr_t memory_base; static int __init early_parse_mem(char *p) { @@ -356,7 +357,6 @@ early_param("mem", early_parse_mem); static int __init early_parse_memmap(char *p) { char *oldp; - u64 start_at, mem_size; if (!p) return -EINVAL; @@ -367,30 +367,38 @@ static int __init early_parse_memmap(char *p) } oldp = p; - mem_size = memparse(p, &p); + memory_limit = memparse(p, &p) & PAGE_MASK; if (p == oldp) return -EINVAL; if (*p == '@') { - start_at = memparse(p+1, &p); - memblock_add(start_at, mem_size); + memory_base = memparse(p + 1, &p) & PAGE_MASK; + } else if (*p == '$') { + memory_base = memparse(p+1, &p) & PAGE_MASK; + memblock_reserve(memory_base, memory_limit); + pr_notice("Memory reserved to %lluMB-%lluMB\n", + (u64)memory_base >> 20, (u64)(memory_base + memory_limit) >> 20); + memory_base = 0; + memory_limit = 0; + return 0; } else if (*p == '#') { - pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); + pr_err("\"memmap=nn#ss\" invalid on MIPS\n"); + memory_limit = 0; + return -EINVAL; + } else if (*p == '!') { + pr_err("\"memmap=nn!ss\" invalid on MIPS\n"); + memory_limit = 0; return -EINVAL; - } else if (*p == '$') { - start_at = memparse(p+1, &p); - memblock_add(start_at, mem_size); - memblock_reserve(start_at, mem_size); } else { - pr_err("\"memmap\" invalid format!\n"); + pr_err("Unrecognized memmap syntax: %s\n", p); + memory_limit = 0; return -EINVAL; } - if (*p == '\0') { - usermem = 1; - return 0; - } else - return -EINVAL; + pr_notice("Memory limited to %lluMB-%lluMB\n", + (u64)memory_base >> 20, (u64)(memory_base + memory_limit) >> 20); + + return *p == '\0' ? 0 : -EINVAL; } early_param("memmap", early_parse_memmap); @@ -667,7 +675,7 @@ static void __init arch_mem_init(char **cmdline_p) __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); /* Limit the memory. */ - memblock_enforce_memory_limit(memory_limit); + memblock_mem_range_remove_map(memory_base, memory_limit); memblock_allow_resize(); early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));