From patchwork Thu Jul 18 03:54:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinjie Ruan X-Patchwork-Id: 13736011 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5481BC3DA49 for ; Thu, 18 Jul 2024 03:52:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=GwMU91bDCxC/AvkhTIT03po1aAGyrlNFKTKp0KOwqKY=; b=LhE0WrSgsObWjb 0O4P8U1qC5eBQtQTkZTvDI2FHpCLFDTnb6dLcO9leu8zYrogg6Eij5wF7AWY+9bIDFKxsPuwDSEDR RXFFn0M2Po/aa1eOxPkCrcWY8WyJ4jU/myEY5D3+KfYVdyoAmSMVMBYp2yyZmzYZnY1055kx0xS6T 42hmDdMib2NRnuk4gT6kQ2fz7fRAX5MndXapbjXk7ipD5QvJp92bnjHRKRiFOPb2/tPtWRcf9m21v TPlpXwSk3oSjy7i2qElajeqBm4p3m8YzPA0FEZlTj5xrBTg2lqG4ufC8k+fSpwDuOzWCrtNuU4hbu m80sW+RMHAowt/x1r6RA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sUICA-0000000FgTq-3elV; Thu, 18 Jul 2024 03:52:42 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sUIAP-0000000FfZ6-46zx; Thu, 18 Jul 2024 03:50:55 +0000 Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4WPf1Z1J4nzdhdQ; Thu, 18 Jul 2024 11:49:06 +0800 (CST) Received: from kwepemi100008.china.huawei.com (unknown [7.221.188.57]) by mail.maildlp.com (Postfix) with ESMTPS id 42D43180105; Thu, 18 Jul 2024 11:50:35 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemi100008.china.huawei.com (7.221.188.57) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Thu, 18 Jul 2024 11:50:05 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v3 3/3] ARM: Use generic interface to simplify crashkernel reservation Date: Thu, 18 Jul 2024 11:54:44 +0800 Message-ID: <20240718035444.2977105-4-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240718035444.2977105-1-ruanjinjie@huawei.com> References: <20240718035444.2977105-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemi100008.china.huawei.com (7.221.188.57) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240717_205054_409522_653FEA6B X-CRM114-Status: GOOD ( 20.88 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Currently, x86, arm64, riscv and loongarch has been switched to generic crashkernel reservation, which is also ready for 32bit system. So with the help of function parse_crashkernel() and generic reserve_crashkernel_generic(), arm32 crashkernel reservation can also be simplified by steps: 1) Add a new header file , and define CRASH_ALIGN, CRASH_ADDR_LOW_MAX, CRASH_ADDR_HIGH_MAX in it; 2) Add arch_reserve_crashkernel() to call parse_crashkernel() and reserve_crashkernel_generic(); 3) Add ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION Kconfig in arch/arm/Kconfig. The old reserve_crashkernel() can be removed. Following test cases have been performed as expected on QEMU vexpress-a9 (1GB system memory): 1) crashkernel=4G,high // invalid 2) crashkernel=1G,high // invalid 3) crashkernel=1G,high crashkernel=0M,low // invalid 4) crashkernel=256M,high // invalid 5) crashkernel=256M,low // invalid 6) crashkernel=256M crashkernel=256M,high // high is ignored, ok 7) crashkernel=256M crashkernel=256M,low // low is ignored, ok 8) crashkernel=256M,high crashkernel=256M,low // invalid 9) crashkernel=256M,high crashkernel=4G,low // invalid 10) crashkernel=256M // ok 11) crashkernel=512M // ok 12) crashkernel=256M@0x88000000 // ok 13) crashkernel=256M@0x78000000 // ok 14) crashkernel=512M@0x78000000 // ok Signed-off-by: Jinjie Ruan Tested-by: Jinjie Ruan Acked-by: Linus Walleij --- v3: - Update the commit message. --- arch/arm/Kconfig | 3 ++ arch/arm/include/asm/crash_reserve.h | 24 +++++++++++ arch/arm/kernel/setup.c | 63 ++++------------------------ 3 files changed, 36 insertions(+), 54 deletions(-) create mode 100644 arch/arm/include/asm/crash_reserve.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f434afff4a2c..3f198ae63950 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1597,6 +1597,9 @@ config ATAGS_PROC config ARCH_SUPPORTS_CRASH_DUMP def_bool y +config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION + def_bool CRASH_RESERVE + config AUTO_ZRELADDR bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100) diff --git a/arch/arm/include/asm/crash_reserve.h b/arch/arm/include/asm/crash_reserve.h new file mode 100644 index 000000000000..85c9298bd3b7 --- /dev/null +++ b/arch/arm/include/asm/crash_reserve.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _ARM_CRASH_RESERVE_H +#define _ARM_CRASH_RESERVE_H + +/* + * The crash region must be aligned to 128MB to avoid + * zImage relocating below the reserved region. + */ +#define CRASH_ALIGN (128 << 20) + +#define CRASH_ADDR_LOW_MAX crash_addr_low_max() +#define CRASH_ADDR_HIGH_MAX memblock_end_of_DRAM() + +static inline unsigned long crash_addr_low_max(void) +{ + unsigned long long crash_max = idmap_to_phys((u32)~0); + unsigned long long lowmem_max = __pa(high_memory - 1) + 1; + + return (crash_max > lowmem_max) ? lowmem_max : crash_max; +} + + +#define HAVE_ARCH_ADD_CRASH_RES_TO_IOMEM_EARLY +#endif diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index e6a857bf0ce6..fc0ada003f6d 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -979,13 +979,6 @@ static int __init init_machine_late(void) } late_initcall(init_machine_late); -#ifdef CONFIG_CRASH_RESERVE -/* - * The crash region must be aligned to 128MB to avoid - * zImage relocating below the reserved region. - */ -#define CRASH_ALIGN (128 << 20) - static inline unsigned long long get_total_mem(void) { unsigned long total; @@ -994,60 +987,25 @@ static inline unsigned long long get_total_mem(void) return total << PAGE_SHIFT; } -/** - * reserve_crashkernel() - reserves memory are for crash kernel - * - * This function reserves memory area given in "crashkernel=" kernel command - * line parameter. The memory reserved is used by a dump capture kernel when - * primary kernel is crashing. - */ -static void __init reserve_crashkernel(void) +static void __init arch_reserve_crashkernel(void) { - unsigned long long crash_size, crash_base; + unsigned long long crash_size, crash_base, low_size = 0; unsigned long long total_mem; + bool high = false; int ret; + if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) + return; + total_mem = get_total_mem(); ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base, - NULL, NULL); + &low_size, &high); /* invalid value specified or crashkernel=0 */ if (ret || !crash_size) return; - if (crash_base <= 0) { - unsigned long long crash_max = idmap_to_phys((u32)~0); - unsigned long long lowmem_max = __pa(high_memory - 1) + 1; - if (crash_max > lowmem_max) - crash_max = lowmem_max; - - crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, - CRASH_ALIGN, crash_max); - if (!crash_base) { - pr_err("crashkernel reservation failed - No suitable area found.\n"); - return; - } - } else { - unsigned long long crash_max = crash_base + crash_size; - unsigned long long start; - - start = memblock_phys_alloc_range(crash_size, SECTION_SIZE, - crash_base, crash_max); - if (!start) { - pr_err("crashkernel reservation failed - memory is in use.\n"); - return; - } - } - - pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", - (unsigned long)(crash_size >> 20), - (unsigned long)(crash_base >> 20), - (unsigned long)(total_mem >> 20)); - - /* The crashk resource must always be located in normal mem */ - crashk_res.start = crash_base; - crashk_res.end = crash_base + crash_size - 1; - insert_resource(&iomem_resource, &crashk_res); + reserve_crashkernel_generic(boot_command_line, crash_size, crash_base, low_size, high); if (arm_has_idmap_alias()) { /* @@ -1064,9 +1022,6 @@ static void __init reserve_crashkernel(void) insert_resource(&iomem_resource, &crashk_boot_res); } } -#else -static inline void reserve_crashkernel(void) {} -#endif /* CONFIG_CRASH_RESERVE*/ void __init hyp_mode_check(void) { @@ -1189,7 +1144,7 @@ void __init setup_arch(char **cmdline_p) if (!is_smp()) hyp_mode_check(); - reserve_crashkernel(); + arch_reserve_crashkernel(); #ifdef CONFIG_VT #if defined(CONFIG_VGA_CONSOLE)