From patchwork Sat Aug 1 13:08:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: chenzhou X-Patchwork-Id: 11696093 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4EC8A1575 for ; Sat, 1 Aug 2020 13:08:16 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1AF0C2076A for ; Sat, 1 Aug 2020 13:08:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="u6fuH6ZM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1AF0C2076A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=PpKIdkGIP3M/NMvRiFJCKK6JrDBvOSvDnrPse//Fjyk=; b=u6fuH6ZMjA/0f8M919rxRGI3O 89+OIrWV/V+yjJoA2mYz3M/iX+GESqMNe16illtM2u3qld9Tt3M55p1u/FZN9x8wRFt7c2wnCvmkG tj2Q6Bqe5WOXx079bYk1nOANZ9sa2Ybwz1kud0ZOMrV4qbR0v1kAeud5ib7Ji5NgfIE+ehXQDUCOV YrMkRhtctbyMKKWMLxh33UGfCoZtVzmyilCDR2GXe2dN9b4d8ra/H8y3Krollb5uvUgyX9rEeY8qS smKbukiNx6P8qu/C3O+IQb91I2GnoKomM3e3XBLUatinnaUQDcoZ7G7i/TzPvb7Cd9BdDJp8dHofK NlPgpdfbw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k1rDf-0000Yf-4i; Sat, 01 Aug 2020 13:06:35 +0000 Received: from szxga06-in.huawei.com ([45.249.212.32] helo=huawei.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k1rDT-0000RP-3x; Sat, 01 Aug 2020 13:06:24 +0000 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 24B54892E5DB33B6111B; Sat, 1 Aug 2020 21:06:05 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.487.0; Sat, 1 Aug 2020 21:05:58 +0800 From: Chen Zhou To: , , , , , , , , , , Subject: [PATCH v11 2/5] x86: kdump: move reserve_crashkernel_low() into crash_core.c Date: Sat, 1 Aug 2020 21:08:53 +0800 Message-ID: <20200801130856.86625-3-chenzhou10@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200801130856.86625-1-chenzhou10@huawei.com> References: <20200801130856.86625-1-chenzhou10@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200801_090623_666385_F9D64D90 X-CRM114-Status: GOOD ( 24.00 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H4 RBL: Very Good reputation (+4) [45.249.212.32 listed in wl.mailspike.net] -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [45.249.212.32 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wangkefeng.wang@huawei.com, arnd@arndb.de, linux-doc@vger.kernel.org, chenzhou10@huawei.com, xiexiuqi@huawei.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, horms@verge.net.au, nsaenzjulienne@suse.de, huawei.libin@huawei.com, guohanjun@huawei.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org In preparation for supporting reserve_crashkernel_low in arm64 as x86_64 does, move reserve_crashkernel_low() into kernel/crash_core.c. BTW, move x86_64 CRASH_ALIGN to 2M suggested by Dave. CONFIG_PHYSICAL_ALIGN can be selected from 2M to 16M, move to the same as arm64. Signed-off-by: Chen Zhou Acked-by: Dave Young --- arch/x86/include/asm/kexec.h | 24 ++++++++++ arch/x86/kernel/setup.c | 86 +++--------------------------------- include/linux/crash_core.h | 3 ++ include/linux/kexec.h | 2 - kernel/crash_core.c | 74 +++++++++++++++++++++++++++++++ kernel/kexec_core.c | 17 ------- 6 files changed, 107 insertions(+), 99 deletions(-) diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index 6802c59e8252..f8f9d952e09f 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -18,6 +18,30 @@ # define KEXEC_CONTROL_CODE_MAX_SIZE 2048 +/* 2M alignment for crash kernel regions */ +#define CRASH_ALIGN SZ_2M + +/* + * Keep the crash kernel below this limit. + * + * Earlier 32-bits kernels would limit the kernel to the low 512 MB range + * due to mapping restrictions. + * + * 64-bit kdump kernels need to be restricted to be under 64 TB, which is + * the upper limit of system RAM in 4-level paging mode. Since the kdump + * jump could be from 5-level paging to 4-level paging, the jump will fail if + * the kernel is put above 64 TB, and during the 1st kernel bootup there's + * no good way to detect the paging mode of the target kernel which will be + * loaded for dumping. + */ +#ifdef CONFIG_X86_32 +# define CRASH_ADDR_LOW_MAX SZ_512M +# define CRASH_ADDR_HIGH_MAX SZ_512M +#else +# define CRASH_ADDR_LOW_MAX SZ_4G +# define CRASH_ADDR_HIGH_MAX SZ_64T +#endif + #ifndef __ASSEMBLY__ #include diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index a3767e74c758..46763c1e5d9f 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -401,83 +401,6 @@ static void __init memblock_x86_reserve_range_setup_data(void) #ifdef CONFIG_KEXEC_CORE -/* 16M alignment for crash kernel regions */ -#define CRASH_ALIGN SZ_16M - -/* - * Keep the crash kernel below this limit. - * - * Earlier 32-bits kernels would limit the kernel to the low 512 MB range - * due to mapping restrictions. - * - * 64-bit kdump kernels need to be restricted to be under 64 TB, which is - * the upper limit of system RAM in 4-level paging mode. Since the kdump - * jump could be from 5-level paging to 4-level paging, the jump will fail if - * the kernel is put above 64 TB, and during the 1st kernel bootup there's - * no good way to detect the paging mode of the target kernel which will be - * loaded for dumping. - */ -#ifdef CONFIG_X86_32 -# define CRASH_ADDR_LOW_MAX SZ_512M -# define CRASH_ADDR_HIGH_MAX SZ_512M -#else -# define CRASH_ADDR_LOW_MAX SZ_4G -# define CRASH_ADDR_HIGH_MAX SZ_64T -#endif - -static int __init reserve_crashkernel_low(void) -{ -#ifdef CONFIG_X86_64 - unsigned long long base, low_base = 0, low_size = 0; - unsigned long total_low_mem; - int ret; - - total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT)); - - /* crashkernel=Y,low */ - ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base); - if (ret) { - /* - * two parts from kernel/dma/swiotlb.c: - * -swiotlb size: user-specified with swiotlb= or default. - * - * -swiotlb overflow buffer: now hardcoded to 32k. We round it - * to 8M for other buffers that may need to stay low too. Also - * make sure we allocate enough extra low memory so that we - * don't run out of DMA buffers for 32-bit devices. - */ - low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20); - } else { - /* passed with crashkernel=0,low ? */ - if (!low_size) - return 0; - } - - low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN); - if (!low_base) { - pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n", - (unsigned long)(low_size >> 20)); - return -ENOMEM; - } - - ret = memblock_reserve(low_base, low_size); - if (ret) { - pr_err("%s: Error reserving crashkernel low memblock.\n", __func__); - return ret; - } - - pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", - (unsigned long)(low_size >> 20), - (unsigned long)(low_base >> 20), - (unsigned long)(total_low_mem >> 20)); - - crashk_low_res.start = low_base; - crashk_low_res.end = low_base + low_size - 1; - insert_resource(&iomem_resource, &crashk_low_res); -#endif - return 0; -} - static void __init reserve_crashkernel(void) { unsigned long long crash_size, crash_base, total_mem; @@ -541,9 +464,12 @@ static void __init reserve_crashkernel(void) return; } - if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) { - memblock_free(crash_base, crash_size); - return; + if (crash_base >= (1ULL << 32)) { + if (reserve_crashkernel_low()) { + memblock_free(crash_base, crash_size); + return; + } + insert_resource(&iomem_resource, &crashk_low_res); } pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h index 525510a9f965..4df8c0bff03e 100644 --- a/include/linux/crash_core.h +++ b/include/linux/crash_core.h @@ -63,6 +63,8 @@ phys_addr_t paddr_vmcoreinfo_note(void); extern unsigned char *vmcoreinfo_data; extern size_t vmcoreinfo_size; extern u32 *vmcoreinfo_note; +extern struct resource crashk_res; +extern struct resource crashk_low_res; Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, void *data, size_t data_len); @@ -74,5 +76,6 @@ int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); int parse_crashkernel_low(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); +int __init reserve_crashkernel_low(void); #endif /* LINUX_CRASH_CORE_H */ diff --git a/include/linux/kexec.h b/include/linux/kexec.h index ea67910ae6b7..a460afdbab0f 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -330,8 +330,6 @@ extern int kexec_load_disabled; /* Location of a reserved region to hold the crash kernel. */ -extern struct resource crashk_res; -extern struct resource crashk_low_res; extern note_buf_t __percpu *crash_notes; /* flag to track if kexec reboot is in progress */ diff --git a/kernel/crash_core.c b/kernel/crash_core.c index 9f1557b98468..c81b15dd78c2 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -7,7 +7,10 @@ #include #include #include +#include +#include +#include #include #include @@ -19,6 +22,22 @@ u32 *vmcoreinfo_note; /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */ static unsigned char *vmcoreinfo_data_safecopy; +/* Location of the reserved area for the crash kernel */ +struct resource crashk_res = { + .name = "Crash kernel", + .start = 0, + .end = 0, + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, + .desc = IORES_DESC_CRASH_KERNEL +}; +struct resource crashk_low_res = { + .name = "Crash kernel", + .start = 0, + .end = 0, + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, + .desc = IORES_DESC_CRASH_KERNEL +}; + /* * parsing the "crashkernel" commandline * @@ -292,6 +311,61 @@ int __init parse_crashkernel_low(char *cmdline, "crashkernel=", suffix_tbl[SUFFIX_LOW]); } +int __init reserve_crashkernel_low(void) +{ +#if defined(CONFIG_X86_64) || defined(CONFIG_ARM64) + unsigned long long base, low_base = 0, low_size = 0; + unsigned long total_low_mem; + int ret; + + total_low_mem = memblock_mem_size(CRASH_ADDR_LOW_MAX >> PAGE_SHIFT); + + /* crashkernel=Y,low */ + ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, + &base); + if (ret) { + /* + * two parts from lib/swiotlb.c: + * -swiotlb size: user-specified with swiotlb= or default. + * + * -swiotlb overflow buffer: now hardcoded to 32k. We round it + * to 8M for other buffers that may need to stay low too. Also + * make sure we allocate enough extra low memory so that we + * don't run out of DMA buffers for 32-bit devices. + */ + low_size = max(swiotlb_size_or_default() + (8UL << 20), + 256UL << 20); + } else { + /* passed with crashkernel=0,low ? */ + if (!low_size) + return 0; + } + + low_base = memblock_find_in_range(0, CRASH_ADDR_LOW_MAX, low_size, CRASH_ALIGN); + if (!low_base) { + pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n", + (unsigned long)(low_size >> 20)); + return -ENOMEM; + } + + ret = memblock_reserve(low_base, low_size); + if (ret) { + pr_err("%s: Error reserving crashkernel low memblock.\n", + __func__); + return ret; + } + + pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", + (unsigned long)(low_size >> 20), + (unsigned long)(low_base >> 20), + (unsigned long)(total_low_mem >> 20)); + + crashk_low_res.start = low_base; + crashk_low_res.end = low_base + low_size - 1; +#endif + return 0; +} + Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, void *data, size_t data_len) { diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index c19c0dad1ebe..db66bbabfff3 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -53,23 +53,6 @@ note_buf_t __percpu *crash_notes; /* Flag to indicate we are going to kexec a new kernel */ bool kexec_in_progress = false; - -/* Location of the reserved area for the crash kernel */ -struct resource crashk_res = { - .name = "Crash kernel", - .start = 0, - .end = 0, - .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, - .desc = IORES_DESC_CRASH_KERNEL -}; -struct resource crashk_low_res = { - .name = "Crash kernel", - .start = 0, - .end = 0, - .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, - .desc = IORES_DESC_CRASH_KERNEL -}; - int kexec_should_crash(struct task_struct *p) { /*