kexec: split crashkernel reservation code out from crash_core.c
Patch series "Split crash out from kexec and clean up related config items", v3. Motivation: ============= Previously, LKP reported a building error. When investigating, it can't be resolved reasonablly with the present messy kdump config items. https://lore.kernel.org/oe-kbuild-all/202312182200.Ka7MzifQ-lkp@intel.com/ The kdump (crash dumping) related config items could causes confusions: Firstly, CRASH_CORE enables codes including - crashkernel reservation; - elfcorehdr updating; - vmcoreinfo exporting; - crash hotplug handling; Now fadump of powerpc, kcore dynamic debugging and kdump all selects CRASH_CORE, while fadump - fadump needs crashkernel parsing, vmcoreinfo exporting, and accessing global variable 'elfcorehdr_addr'; - kcore only needs vmcoreinfo exporting; - kdump needs all of the current kernel/crash_core.c. So only enabling PROC_CORE or FA_DUMP will enable CRASH_CORE, this mislead people that we enable crash dumping, actual it's not. Secondly, It's not reasonable to allow KEXEC_CORE select CRASH_CORE. Because KEXEC_CORE enables codes which allocate control pages, copy kexec/kdump segments, and prepare for switching. These codes are shared by both kexec reboot and kdump. We could want kexec reboot, but disable kdump. In that case, CRASH_CORE should not be selected. -------------------- CONFIG_CRASH_CORE=y CONFIG_KEXEC_CORE=y CONFIG_KEXEC=y CONFIG_KEXEC_FILE=y --------------------- Thirdly, It's not reasonable to allow CRASH_DUMP select KEXEC_CORE. That could make KEXEC_CORE, CRASH_DUMP are enabled independently from KEXEC or KEXEC_FILE. However, w/o KEXEC or KEXEC_FILE, the KEXEC_CORE code built in doesn't make any sense because no kernel loading or switching will happen to utilize the KEXEC_CORE code. --------------------- CONFIG_CRASH_CORE=y CONFIG_KEXEC_CORE=y CONFIG_CRASH_DUMP=y --------------------- In this case, what is worse, on arch sh and arm, KEXEC relies on MMU, while CRASH_DUMP can still be enabled when !MMU, then compiling error is seen as the lkp test robot reported in above link. ------arch/sh/Kconfig------ config ARCH_SUPPORTS_KEXEC def_bool MMU config ARCH_SUPPORTS_CRASH_DUMP def_bool BROKEN_ON_SMP --------------------------- Changes: =========== 1, split out crash_reserve.c from crash_core.c; 2, split out vmcore_infoc. from crash_core.c; 3, move crash related codes in kexec_core.c into crash_core.c; 4, remove dependency of FA_DUMP on CRASH_DUMP; 5, clean up kdump related config items; 6, wrap up crash codes in crash related ifdefs on all 8 arch-es which support crash dumping, except of ppc; Achievement: =========== With above changes, I can rearrange the config item logic as below (the right item depends on or is selected by the left item): PROC_KCORE -----------> VMCORE_INFO |----------> VMCORE_INFO FA_DUMP----| |----------> CRASH_RESERVE ---->VMCORE_INFO / |---->CRASH_RESERVE KEXEC --| /| |--> KEXEC_CORE--> CRASH_DUMP-->/-|---->PROC_VMCORE KEXEC_FILE --| \ | \---->CRASH_HOTPLUG KEXEC --| |--> KEXEC_CORE (for kexec reboot only) KEXEC_FILE --| Test ======== On all 8 architectures, including x86_64, arm64, s390x, sh, arm, mips, riscv, loongarch, I did below three cases of config item setting and building all passed. Take configs on x86_64 as exampmle here: (1) Both CONFIG_KEXEC and KEXEC_FILE is unset, then all kexec/kdump items are unset automatically: # Kexec and crash features # CONFIG_KEXEC is not set # CONFIG_KEXEC_FILE is not set # end of Kexec and crash features (2) set CONFIG_KEXEC_FILE and 'make olddefconfig': --------------- # Kexec and crash features CONFIG_CRASH_RESERVE=y CONFIG_VMCORE_INFO=y CONFIG_KEXEC_CORE=y CONFIG_KEXEC_FILE=y CONFIG_CRASH_DUMP=y CONFIG_CRASH_HOTPLUG=y CONFIG_CRASH_MAX_MEMORY_RANGES=8192 # end of Kexec and crash features --------------- (3) unset CONFIG_CRASH_DUMP in case 2 and execute 'make olddefconfig': ------------------------ # Kexec and crash features CONFIG_KEXEC_CORE=y CONFIG_KEXEC_FILE=y # end of Kexec and crash features ------------------------ Note: For ppc, it needs investigation to make clear how to split out crash code in arch folder. Hope Hari and Pingfan can help have a look, see if it's doable. Now, I make it either have both kexec and crash enabled, or disable both of them altogether. This patch (of 14): Both kdump and fa_dump of ppc rely on crashkernel reservation. Move the relevant codes into separate files: crash_reserve.c, include/linux/crash_reserve.h. And also add config item CRASH_RESERVE to control its enabling of the codes. And update config items which has relationship with crashkernel reservation. And also change ifdeffery from CONFIG_CRASH_CORE to CONFIG_CRASH_RESERVE when those scopes are only crashkernel reservation related. And also rename arch/XXX/include/asm/{crash_core.h => crash_reserve.h} on arm64, x86 and risc-v because those architectures' crash_core.h is only related to crashkernel reservation. [akpm@linux-foundation.org: s/CRASH_RESEERVE/CRASH_RESERVE/, per Klara Modin] Link: https://lkml.kernel.org/r/20240124051254.67105-1-bhe@redhat.com Link: https://lkml.kernel.org/r/20240124051254.67105-2-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Acked-by: Hari Bathini <hbathini@linux.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Pingfan Liu <piliu@redhat.com> Cc: Klara Modin <klarasmodin@gmail.com> Cc: Michael Kelley <mhklinux@outlook.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
parent
8be4d46e12
commit
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@ -1519,7 +1519,7 @@ config ARCH_SUPPORTS_CRASH_DUMP
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def_bool y
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config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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def_bool CRASH_CORE
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def_bool CRASH_RESERVE
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config TRANS_TABLE
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def_bool y
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@ -1,6 +1,6 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ARM64_CRASH_CORE_H
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#define _ARM64_CRASH_CORE_H
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#ifndef _ARM64_CRASH_RESERVE_H
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#define _ARM64_CRASH_RESERVE_H
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/* Current arm64 boot protocol requires 2MB alignment */
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#define CRASH_ALIGN SZ_2M
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@ -691,6 +691,7 @@ config FA_DUMP
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bool "Firmware-assisted dump"
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depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
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select CRASH_CORE
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select CRASH_RESERVE
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select CRASH_DUMP
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help
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A robust mechanism to get reliable kernel crash dump with
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@ -13,7 +13,7 @@
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#include <linux/delay.h>
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#include <linux/memblock.h>
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#include <linux/libfdt.h>
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#include <linux/crash_core.h>
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#include <linux/crash_reserve.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/cacheflush.h>
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@ -173,7 +173,7 @@ static __init bool overlaps_region(const void *fdt, u32 start,
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static void __init get_crash_kernel(void *fdt, unsigned long size)
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{
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#ifdef CONFIG_CRASH_CORE
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#ifdef CONFIG_CRASH_RESERVE
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unsigned long long crash_size, crash_base;
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int ret;
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@ -767,7 +767,7 @@ config ARCH_SUPPORTS_CRASH_DUMP
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def_bool y
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config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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def_bool CRASH_CORE
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def_bool CRASH_RESERVE
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config COMPAT
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bool "Kernel support for 32-bit U-mode"
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@ -1,6 +1,6 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _RISCV_CRASH_CORE_H
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#define _RISCV_CRASH_CORE_H
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#ifndef _RISCV_CRASH_RESERVE_H
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#define _RISCV_CRASH_RESERVE_H
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#define CRASH_ALIGN PMD_SIZE
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@ -2106,7 +2106,7 @@ config ARCH_SUPPORTS_CRASH_HOTPLUG
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def_bool y
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config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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def_bool CRASH_CORE
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def_bool CRASH_RESERVE
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config PHYSICAL_START
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hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
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@ -1,6 +1,6 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _X86_CRASH_CORE_H
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#define _X86_CRASH_CORE_H
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#ifndef _X86_CRASH_RESERVE_H
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#define _X86_CRASH_RESERVE_H
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/* 16M alignment for crash kernel regions */
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#define CRASH_ALIGN SZ_16M
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@ -39,4 +39,4 @@ static inline unsigned long crash_low_size_default(void)
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#endif
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}
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#endif /* _X86_CRASH_CORE_H */
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#endif /* _X86_CRASH_RESERVE_H */
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@ -5,14 +5,6 @@
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#include <linux/linkage.h>
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#include <linux/elfcore.h>
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#include <linux/elf.h>
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#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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#include <asm/crash_core.h>
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#endif
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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extern struct resource crashk_low_res;
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#define CRASH_CORE_NOTE_NAME "CORE"
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#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
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@ -87,38 +79,6 @@ Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
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void *data, size_t data_len);
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void final_note(Elf_Word *buf);
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int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
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unsigned long long *crash_size, unsigned long long *crash_base,
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unsigned long long *low_size, bool *high);
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#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
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#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
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#endif
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#ifndef CRASH_ALIGN
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#define CRASH_ALIGN SZ_2M
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#endif
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#ifndef CRASH_ADDR_LOW_MAX
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#define CRASH_ADDR_LOW_MAX SZ_4G
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#endif
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#ifndef CRASH_ADDR_HIGH_MAX
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#define CRASH_ADDR_HIGH_MAX memblock_end_of_DRAM()
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#endif
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void __init reserve_crashkernel_generic(char *cmdline,
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unsigned long long crash_size,
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unsigned long long crash_base,
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unsigned long long crash_low_size,
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bool high);
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#else
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static inline void __init reserve_crashkernel_generic(char *cmdline,
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unsigned long long crash_size,
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unsigned long long crash_base,
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unsigned long long crash_low_size,
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bool high)
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{}
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#endif
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/* Alignment required for elf header segment */
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#define ELF_CORE_HEADER_ALIGN 4096
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48
include/linux/crash_reserve.h
Normal file
48
include/linux/crash_reserve.h
Normal file
@ -0,0 +1,48 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_CRASH_RESERVE_H
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#define LINUX_CRASH_RESERVE_H
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#include <linux/linkage.h>
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#include <linux/elfcore.h>
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#include <linux/elf.h>
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#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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#include <asm/crash_reserve.h>
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#endif
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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extern struct resource crashk_low_res;
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int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
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unsigned long long *crash_size, unsigned long long *crash_base,
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unsigned long long *low_size, bool *high);
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#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
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#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
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#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
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#endif
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#ifndef CRASH_ALIGN
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#define CRASH_ALIGN SZ_2M
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#endif
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#ifndef CRASH_ADDR_LOW_MAX
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#define CRASH_ADDR_LOW_MAX SZ_4G
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#endif
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#ifndef CRASH_ADDR_HIGH_MAX
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#define CRASH_ADDR_HIGH_MAX memblock_end_of_DRAM()
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#endif
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void __init reserve_crashkernel_generic(char *cmdline,
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unsigned long long crash_size,
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unsigned long long crash_base,
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unsigned long long crash_low_size,
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bool high);
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#else
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static inline void __init reserve_crashkernel_generic(char *cmdline,
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unsigned long long crash_size,
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unsigned long long crash_base,
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unsigned long long crash_low_size,
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bool high)
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{}
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#endif
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#endif /* LINUX_CRASH_RESERVE_H */
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@ -16,6 +16,7 @@
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#if !defined(__ASSEMBLY__)
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#include <linux/crash_core.h>
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#include <linux/crash_reserve.h>
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#include <asm/io.h>
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#include <linux/range.h>
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@ -2,11 +2,15 @@
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menu "Kexec and crash features"
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config CRASH_RESERVE
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bool
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config CRASH_CORE
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bool
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config KEXEC_CORE
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select CRASH_CORE
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select CRASH_RESERVE
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bool
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config KEXEC_ELF
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@ -96,7 +100,6 @@ config KEXEC_JUMP
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config CRASH_DUMP
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bool "kernel crash dumps"
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depends on ARCH_SUPPORTS_CRASH_DUMP
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select CRASH_CORE
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select KEXEC_CORE
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help
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Generate crash dump after being started by kexec.
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@ -69,6 +69,7 @@ obj-$(CONFIG_KALLSYMS) += kallsyms.o
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obj-$(CONFIG_KALLSYMS_SELFTEST) += kallsyms_selftest.o
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obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
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obj-$(CONFIG_CRASH_CORE) += crash_core.o
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obj-$(CONFIG_CRASH_RESERVE) += crash_reserve.o
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obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
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obj-$(CONFIG_KEXEC) += kexec.o
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obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
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/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
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static unsigned char *vmcoreinfo_data_safecopy;
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/* Location of the reserved area for the crash kernel */
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struct resource crashk_res = {
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.name = "Crash kernel",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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.desc = IORES_DESC_CRASH_KERNEL
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};
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struct resource crashk_low_res = {
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.name = "Crash kernel",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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.desc = IORES_DESC_CRASH_KERNEL
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};
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/*
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* parsing the "crashkernel" commandline
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*
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* this code is intended to be called from architecture specific code
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*/
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/*
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* This function parses command lines in the format
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*
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* crashkernel=ramsize-range:size[,...][@offset]
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*
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* The function returns 0 on success and -EINVAL on failure.
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*/
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static int __init parse_crashkernel_mem(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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char *cur = cmdline, *tmp;
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unsigned long long total_mem = system_ram;
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/*
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* Firmware sometimes reserves some memory regions for its own use,
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* so the system memory size is less than the actual physical memory
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* size. Work around this by rounding up the total size to 128M,
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* which is enough for most test cases.
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*/
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total_mem = roundup(total_mem, SZ_128M);
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/* for each entry of the comma-separated list */
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do {
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unsigned long long start, end = ULLONG_MAX, size;
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/* get the start of the range */
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start = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("crashkernel: Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (*cur != '-') {
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pr_warn("crashkernel: '-' expected\n");
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return -EINVAL;
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}
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cur++;
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/* if no ':' is here, than we read the end */
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if (*cur != ':') {
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end = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("crashkernel: Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (end <= start) {
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pr_warn("crashkernel: end <= start\n");
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return -EINVAL;
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}
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}
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if (*cur != ':') {
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pr_warn("crashkernel: ':' expected\n");
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return -EINVAL;
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}
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cur++;
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size = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (size >= total_mem) {
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pr_warn("crashkernel: invalid size\n");
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return -EINVAL;
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}
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/* match ? */
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if (total_mem >= start && total_mem < end) {
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*crash_size = size;
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break;
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}
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} while (*cur++ == ',');
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if (*crash_size > 0) {
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while (*cur && *cur != ' ' && *cur != '@')
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cur++;
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if (*cur == '@') {
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cur++;
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*crash_base = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("Memory value expected after '@'\n");
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return -EINVAL;
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}
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}
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} else
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pr_info("crashkernel size resulted in zero bytes\n");
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return 0;
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}
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/*
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* That function parses "simple" (old) crashkernel command lines like
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*
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* crashkernel=size[@offset]
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*
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* It returns 0 on success and -EINVAL on failure.
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*/
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static int __init parse_crashkernel_simple(char *cmdline,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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char *cur = cmdline;
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*crash_size = memparse(cmdline, &cur);
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if (cmdline == cur) {
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pr_warn("crashkernel: memory value expected\n");
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return -EINVAL;
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}
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if (*cur == '@')
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*crash_base = memparse(cur+1, &cur);
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else if (*cur != ' ' && *cur != '\0') {
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pr_warn("crashkernel: unrecognized char: %c\n", *cur);
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return -EINVAL;
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}
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return 0;
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||||
}
|
||||
|
||||
#define SUFFIX_HIGH 0
|
||||
#define SUFFIX_LOW 1
|
||||
#define SUFFIX_NULL 2
|
||||
static __initdata char *suffix_tbl[] = {
|
||||
[SUFFIX_HIGH] = ",high",
|
||||
[SUFFIX_LOW] = ",low",
|
||||
[SUFFIX_NULL] = NULL,
|
||||
};
|
||||
|
||||
/*
|
||||
* That function parses "suffix" crashkernel command lines like
|
||||
*
|
||||
* crashkernel=size,[high|low]
|
||||
*
|
||||
* It returns 0 on success and -EINVAL on failure.
|
||||
*/
|
||||
static int __init parse_crashkernel_suffix(char *cmdline,
|
||||
unsigned long long *crash_size,
|
||||
const char *suffix)
|
||||
{
|
||||
char *cur = cmdline;
|
||||
|
||||
*crash_size = memparse(cmdline, &cur);
|
||||
if (cmdline == cur) {
|
||||
pr_warn("crashkernel: memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* check with suffix */
|
||||
if (strncmp(cur, suffix, strlen(suffix))) {
|
||||
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
||||
return -EINVAL;
|
||||
}
|
||||
cur += strlen(suffix);
|
||||
if (*cur != ' ' && *cur != '\0') {
|
||||
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __init char *get_last_crashkernel(char *cmdline,
|
||||
const char *name,
|
||||
const char *suffix)
|
||||
{
|
||||
char *p = cmdline, *ck_cmdline = NULL;
|
||||
|
||||
/* find crashkernel and use the last one if there are more */
|
||||
p = strstr(p, name);
|
||||
while (p) {
|
||||
char *end_p = strchr(p, ' ');
|
||||
char *q;
|
||||
|
||||
if (!end_p)
|
||||
end_p = p + strlen(p);
|
||||
|
||||
if (!suffix) {
|
||||
int i;
|
||||
|
||||
/* skip the one with any known suffix */
|
||||
for (i = 0; suffix_tbl[i]; i++) {
|
||||
q = end_p - strlen(suffix_tbl[i]);
|
||||
if (!strncmp(q, suffix_tbl[i],
|
||||
strlen(suffix_tbl[i])))
|
||||
goto next;
|
||||
}
|
||||
ck_cmdline = p;
|
||||
} else {
|
||||
q = end_p - strlen(suffix);
|
||||
if (!strncmp(q, suffix, strlen(suffix)))
|
||||
ck_cmdline = p;
|
||||
}
|
||||
next:
|
||||
p = strstr(p+1, name);
|
||||
}
|
||||
|
||||
return ck_cmdline;
|
||||
}
|
||||
|
||||
static int __init __parse_crashkernel(char *cmdline,
|
||||
unsigned long long system_ram,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base,
|
||||
const char *suffix)
|
||||
{
|
||||
char *first_colon, *first_space;
|
||||
char *ck_cmdline;
|
||||
char *name = "crashkernel=";
|
||||
|
||||
BUG_ON(!crash_size || !crash_base);
|
||||
*crash_size = 0;
|
||||
*crash_base = 0;
|
||||
|
||||
ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
|
||||
if (!ck_cmdline)
|
||||
return -ENOENT;
|
||||
|
||||
ck_cmdline += strlen(name);
|
||||
|
||||
if (suffix)
|
||||
return parse_crashkernel_suffix(ck_cmdline, crash_size,
|
||||
suffix);
|
||||
/*
|
||||
* if the commandline contains a ':', then that's the extended
|
||||
* syntax -- if not, it must be the classic syntax
|
||||
*/
|
||||
first_colon = strchr(ck_cmdline, ':');
|
||||
first_space = strchr(ck_cmdline, ' ');
|
||||
if (first_colon && (!first_space || first_colon < first_space))
|
||||
return parse_crashkernel_mem(ck_cmdline, system_ram,
|
||||
crash_size, crash_base);
|
||||
|
||||
return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
|
||||
}
|
||||
|
||||
/*
|
||||
* That function is the entry point for command line parsing and should be
|
||||
* called from the arch-specific code.
|
||||
*
|
||||
* If crashkernel=,high|low is supported on architecture, non-NULL values
|
||||
* should be passed to parameters 'low_size' and 'high'.
|
||||
*/
|
||||
int __init parse_crashkernel(char *cmdline,
|
||||
unsigned long long system_ram,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base,
|
||||
unsigned long long *low_size,
|
||||
bool *high)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* crashkernel=X[@offset] */
|
||||
ret = __parse_crashkernel(cmdline, system_ram, crash_size,
|
||||
crash_base, NULL);
|
||||
#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
|
||||
/*
|
||||
* If non-NULL 'high' passed in and no normal crashkernel
|
||||
* setting detected, try parsing crashkernel=,high|low.
|
||||
*/
|
||||
if (high && ret == -ENOENT) {
|
||||
ret = __parse_crashkernel(cmdline, 0, crash_size,
|
||||
crash_base, suffix_tbl[SUFFIX_HIGH]);
|
||||
if (ret || !*crash_size)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* crashkernel=Y,low can be specified or not, but invalid value
|
||||
* is not allowed.
|
||||
*/
|
||||
ret = __parse_crashkernel(cmdline, 0, low_size,
|
||||
crash_base, suffix_tbl[SUFFIX_LOW]);
|
||||
if (ret == -ENOENT) {
|
||||
*low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
|
||||
ret = 0;
|
||||
} else if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
*high = true;
|
||||
}
|
||||
#endif
|
||||
if (!*crash_size)
|
||||
ret = -EINVAL;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Add a dummy early_param handler to mark crashkernel= as a known command line
|
||||
* parameter and suppress incorrect warnings in init/main.c.
|
||||
*/
|
||||
static int __init parse_crashkernel_dummy(char *arg)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
early_param("crashkernel", parse_crashkernel_dummy);
|
||||
|
||||
#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
|
||||
static int __init reserve_crashkernel_low(unsigned long long low_size)
|
||||
{
|
||||
#ifdef CONFIG_64BIT
|
||||
unsigned long long low_base;
|
||||
|
||||
low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
|
||||
if (!low_base) {
|
||||
pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
|
||||
low_base, low_base + low_size, low_size >> 20);
|
||||
|
||||
crashk_low_res.start = low_base;
|
||||
crashk_low_res.end = low_base + low_size - 1;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __init reserve_crashkernel_generic(char *cmdline,
|
||||
unsigned long long crash_size,
|
||||
unsigned long long crash_base,
|
||||
unsigned long long crash_low_size,
|
||||
bool high)
|
||||
{
|
||||
unsigned long long search_end = CRASH_ADDR_LOW_MAX, search_base = 0;
|
||||
bool fixed_base = false;
|
||||
|
||||
/* User specifies base address explicitly. */
|
||||
if (crash_base) {
|
||||
fixed_base = true;
|
||||
search_base = crash_base;
|
||||
search_end = crash_base + crash_size;
|
||||
} else if (high) {
|
||||
search_base = CRASH_ADDR_LOW_MAX;
|
||||
search_end = CRASH_ADDR_HIGH_MAX;
|
||||
}
|
||||
|
||||
retry:
|
||||
crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
|
||||
search_base, search_end);
|
||||
if (!crash_base) {
|
||||
/*
|
||||
* For crashkernel=size[KMG]@offset[KMG], print out failure
|
||||
* message if can't reserve the specified region.
|
||||
*/
|
||||
if (fixed_base) {
|
||||
pr_warn("crashkernel reservation failed - memory is in use.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* For crashkernel=size[KMG], if the first attempt was for
|
||||
* low memory, fall back to high memory, the minimum required
|
||||
* low memory will be reserved later.
|
||||
*/
|
||||
if (!high && search_end == CRASH_ADDR_LOW_MAX) {
|
||||
search_end = CRASH_ADDR_HIGH_MAX;
|
||||
search_base = CRASH_ADDR_LOW_MAX;
|
||||
crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
|
||||
goto retry;
|
||||
}
|
||||
|
||||
/*
|
||||
* For crashkernel=size[KMG],high, if the first attempt was
|
||||
* for high memory, fall back to low memory.
|
||||
*/
|
||||
if (high && search_end == CRASH_ADDR_HIGH_MAX) {
|
||||
search_end = CRASH_ADDR_LOW_MAX;
|
||||
search_base = 0;
|
||||
goto retry;
|
||||
}
|
||||
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
|
||||
crash_size);
|
||||
return;
|
||||
}
|
||||
|
||||
if ((crash_base >= CRASH_ADDR_LOW_MAX) &&
|
||||
crash_low_size && reserve_crashkernel_low(crash_low_size)) {
|
||||
memblock_phys_free(crash_base, crash_size);
|
||||
return;
|
||||
}
|
||||
|
||||
pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
|
||||
crash_base, crash_base + crash_size, crash_size >> 20);
|
||||
|
||||
/*
|
||||
* The crashkernel memory will be removed from the kernel linear
|
||||
* map. Inform kmemleak so that it won't try to access it.
|
||||
*/
|
||||
kmemleak_ignore_phys(crash_base);
|
||||
if (crashk_low_res.end)
|
||||
kmemleak_ignore_phys(crashk_low_res.start);
|
||||
|
||||
crashk_res.start = crash_base;
|
||||
crashk_res.end = crash_base + crash_size - 1;
|
||||
}
|
||||
|
||||
static __init int insert_crashkernel_resources(void)
|
||||
{
|
||||
if (crashk_res.start < crashk_res.end)
|
||||
insert_resource(&iomem_resource, &crashk_res);
|
||||
|
||||
if (crashk_low_res.start < crashk_low_res.end)
|
||||
insert_resource(&iomem_resource, &crashk_low_res);
|
||||
|
||||
return 0;
|
||||
}
|
||||
early_initcall(insert_crashkernel_resources);
|
||||
#endif
|
||||
|
||||
int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
|
||||
void **addr, unsigned long *sz)
|
||||
{
|
||||
|
464
kernel/crash_reserve.c
Normal file
464
kernel/crash_reserve.c
Normal file
@ -0,0 +1,464 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* crash.c - kernel crash support code.
|
||||
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
|
||||
*/
|
||||
|
||||
#include <linux/buildid.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/utsname.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/sizes.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/memory.h>
|
||||
#include <linux/cpuhotplug.h>
|
||||
#include <linux/memblock.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/kmemleak.h>
|
||||
|
||||
#include <asm/page.h>
|
||||
#include <asm/sections.h>
|
||||
|
||||
#include <crypto/sha1.h>
|
||||
|
||||
#include "kallsyms_internal.h"
|
||||
#include "kexec_internal.h"
|
||||
|
||||
/* 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
|
||||
*
|
||||
* this code is intended to be called from architecture specific code
|
||||
*/
|
||||
|
||||
|
||||
/*
|
||||
* This function parses command lines in the format
|
||||
*
|
||||
* crashkernel=ramsize-range:size[,...][@offset]
|
||||
*
|
||||
* The function returns 0 on success and -EINVAL on failure.
|
||||
*/
|
||||
static int __init parse_crashkernel_mem(char *cmdline,
|
||||
unsigned long long system_ram,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base)
|
||||
{
|
||||
char *cur = cmdline, *tmp;
|
||||
unsigned long long total_mem = system_ram;
|
||||
|
||||
/*
|
||||
* Firmware sometimes reserves some memory regions for its own use,
|
||||
* so the system memory size is less than the actual physical memory
|
||||
* size. Work around this by rounding up the total size to 128M,
|
||||
* which is enough for most test cases.
|
||||
*/
|
||||
total_mem = roundup(total_mem, SZ_128M);
|
||||
|
||||
/* for each entry of the comma-separated list */
|
||||
do {
|
||||
unsigned long long start, end = ULLONG_MAX, size;
|
||||
|
||||
/* get the start of the range */
|
||||
start = memparse(cur, &tmp);
|
||||
if (cur == tmp) {
|
||||
pr_warn("crashkernel: Memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
cur = tmp;
|
||||
if (*cur != '-') {
|
||||
pr_warn("crashkernel: '-' expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
cur++;
|
||||
|
||||
/* if no ':' is here, than we read the end */
|
||||
if (*cur != ':') {
|
||||
end = memparse(cur, &tmp);
|
||||
if (cur == tmp) {
|
||||
pr_warn("crashkernel: Memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
cur = tmp;
|
||||
if (end <= start) {
|
||||
pr_warn("crashkernel: end <= start\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
if (*cur != ':') {
|
||||
pr_warn("crashkernel: ':' expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
cur++;
|
||||
|
||||
size = memparse(cur, &tmp);
|
||||
if (cur == tmp) {
|
||||
pr_warn("Memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
cur = tmp;
|
||||
if (size >= total_mem) {
|
||||
pr_warn("crashkernel: invalid size\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* match ? */
|
||||
if (total_mem >= start && total_mem < end) {
|
||||
*crash_size = size;
|
||||
break;
|
||||
}
|
||||
} while (*cur++ == ',');
|
||||
|
||||
if (*crash_size > 0) {
|
||||
while (*cur && *cur != ' ' && *cur != '@')
|
||||
cur++;
|
||||
if (*cur == '@') {
|
||||
cur++;
|
||||
*crash_base = memparse(cur, &tmp);
|
||||
if (cur == tmp) {
|
||||
pr_warn("Memory value expected after '@'\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
} else
|
||||
pr_info("crashkernel size resulted in zero bytes\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* That function parses "simple" (old) crashkernel command lines like
|
||||
*
|
||||
* crashkernel=size[@offset]
|
||||
*
|
||||
* It returns 0 on success and -EINVAL on failure.
|
||||
*/
|
||||
static int __init parse_crashkernel_simple(char *cmdline,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base)
|
||||
{
|
||||
char *cur = cmdline;
|
||||
|
||||
*crash_size = memparse(cmdline, &cur);
|
||||
if (cmdline == cur) {
|
||||
pr_warn("crashkernel: memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (*cur == '@')
|
||||
*crash_base = memparse(cur+1, &cur);
|
||||
else if (*cur != ' ' && *cur != '\0') {
|
||||
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define SUFFIX_HIGH 0
|
||||
#define SUFFIX_LOW 1
|
||||
#define SUFFIX_NULL 2
|
||||
static __initdata char *suffix_tbl[] = {
|
||||
[SUFFIX_HIGH] = ",high",
|
||||
[SUFFIX_LOW] = ",low",
|
||||
[SUFFIX_NULL] = NULL,
|
||||
};
|
||||
|
||||
/*
|
||||
* That function parses "suffix" crashkernel command lines like
|
||||
*
|
||||
* crashkernel=size,[high|low]
|
||||
*
|
||||
* It returns 0 on success and -EINVAL on failure.
|
||||
*/
|
||||
static int __init parse_crashkernel_suffix(char *cmdline,
|
||||
unsigned long long *crash_size,
|
||||
const char *suffix)
|
||||
{
|
||||
char *cur = cmdline;
|
||||
|
||||
*crash_size = memparse(cmdline, &cur);
|
||||
if (cmdline == cur) {
|
||||
pr_warn("crashkernel: memory value expected\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* check with suffix */
|
||||
if (strncmp(cur, suffix, strlen(suffix))) {
|
||||
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
||||
return -EINVAL;
|
||||
}
|
||||
cur += strlen(suffix);
|
||||
if (*cur != ' ' && *cur != '\0') {
|
||||
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __init char *get_last_crashkernel(char *cmdline,
|
||||
const char *name,
|
||||
const char *suffix)
|
||||
{
|
||||
char *p = cmdline, *ck_cmdline = NULL;
|
||||
|
||||
/* find crashkernel and use the last one if there are more */
|
||||
p = strstr(p, name);
|
||||
while (p) {
|
||||
char *end_p = strchr(p, ' ');
|
||||
char *q;
|
||||
|
||||
if (!end_p)
|
||||
end_p = p + strlen(p);
|
||||
|
||||
if (!suffix) {
|
||||
int i;
|
||||
|
||||
/* skip the one with any known suffix */
|
||||
for (i = 0; suffix_tbl[i]; i++) {
|
||||
q = end_p - strlen(suffix_tbl[i]);
|
||||
if (!strncmp(q, suffix_tbl[i],
|
||||
strlen(suffix_tbl[i])))
|
||||
goto next;
|
||||
}
|
||||
ck_cmdline = p;
|
||||
} else {
|
||||
q = end_p - strlen(suffix);
|
||||
if (!strncmp(q, suffix, strlen(suffix)))
|
||||
ck_cmdline = p;
|
||||
}
|
||||
next:
|
||||
p = strstr(p+1, name);
|
||||
}
|
||||
|
||||
return ck_cmdline;
|
||||
}
|
||||
|
||||
static int __init __parse_crashkernel(char *cmdline,
|
||||
unsigned long long system_ram,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base,
|
||||
const char *suffix)
|
||||
{
|
||||
char *first_colon, *first_space;
|
||||
char *ck_cmdline;
|
||||
char *name = "crashkernel=";
|
||||
|
||||
BUG_ON(!crash_size || !crash_base);
|
||||
*crash_size = 0;
|
||||
*crash_base = 0;
|
||||
|
||||
ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
|
||||
if (!ck_cmdline)
|
||||
return -ENOENT;
|
||||
|
||||
ck_cmdline += strlen(name);
|
||||
|
||||
if (suffix)
|
||||
return parse_crashkernel_suffix(ck_cmdline, crash_size,
|
||||
suffix);
|
||||
/*
|
||||
* if the commandline contains a ':', then that's the extended
|
||||
* syntax -- if not, it must be the classic syntax
|
||||
*/
|
||||
first_colon = strchr(ck_cmdline, ':');
|
||||
first_space = strchr(ck_cmdline, ' ');
|
||||
if (first_colon && (!first_space || first_colon < first_space))
|
||||
return parse_crashkernel_mem(ck_cmdline, system_ram,
|
||||
crash_size, crash_base);
|
||||
|
||||
return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
|
||||
}
|
||||
|
||||
/*
|
||||
* That function is the entry point for command line parsing and should be
|
||||
* called from the arch-specific code.
|
||||
*
|
||||
* If crashkernel=,high|low is supported on architecture, non-NULL values
|
||||
* should be passed to parameters 'low_size' and 'high'.
|
||||
*/
|
||||
int __init parse_crashkernel(char *cmdline,
|
||||
unsigned long long system_ram,
|
||||
unsigned long long *crash_size,
|
||||
unsigned long long *crash_base,
|
||||
unsigned long long *low_size,
|
||||
bool *high)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* crashkernel=X[@offset] */
|
||||
ret = __parse_crashkernel(cmdline, system_ram, crash_size,
|
||||
crash_base, NULL);
|
||||
#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
|
||||
/*
|
||||
* If non-NULL 'high' passed in and no normal crashkernel
|
||||
* setting detected, try parsing crashkernel=,high|low.
|
||||
*/
|
||||
if (high && ret == -ENOENT) {
|
||||
ret = __parse_crashkernel(cmdline, 0, crash_size,
|
||||
crash_base, suffix_tbl[SUFFIX_HIGH]);
|
||||
if (ret || !*crash_size)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* crashkernel=Y,low can be specified or not, but invalid value
|
||||
* is not allowed.
|
||||
*/
|
||||
ret = __parse_crashkernel(cmdline, 0, low_size,
|
||||
crash_base, suffix_tbl[SUFFIX_LOW]);
|
||||
if (ret == -ENOENT) {
|
||||
*low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
|
||||
ret = 0;
|
||||
} else if (ret) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
*high = true;
|
||||
}
|
||||
#endif
|
||||
if (!*crash_size)
|
||||
ret = -EINVAL;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Add a dummy early_param handler to mark crashkernel= as a known command line
|
||||
* parameter and suppress incorrect warnings in init/main.c.
|
||||
*/
|
||||
static int __init parse_crashkernel_dummy(char *arg)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
early_param("crashkernel", parse_crashkernel_dummy);
|
||||
|
||||
#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
|
||||
static int __init reserve_crashkernel_low(unsigned long long low_size)
|
||||
{
|
||||
#ifdef CONFIG_64BIT
|
||||
unsigned long long low_base;
|
||||
|
||||
low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
|
||||
if (!low_base) {
|
||||
pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
|
||||
low_base, low_base + low_size, low_size >> 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;
|
||||
}
|
||||
|
||||
void __init reserve_crashkernel_generic(char *cmdline,
|
||||
unsigned long long crash_size,
|
||||
unsigned long long crash_base,
|
||||
unsigned long long crash_low_size,
|
||||
bool high)
|
||||
{
|
||||
unsigned long long search_end = CRASH_ADDR_LOW_MAX, search_base = 0;
|
||||
bool fixed_base = false;
|
||||
|
||||
/* User specifies base address explicitly. */
|
||||
if (crash_base) {
|
||||
fixed_base = true;
|
||||
search_base = crash_base;
|
||||
search_end = crash_base + crash_size;
|
||||
} else if (high) {
|
||||
search_base = CRASH_ADDR_LOW_MAX;
|
||||
search_end = CRASH_ADDR_HIGH_MAX;
|
||||
}
|
||||
|
||||
retry:
|
||||
crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
|
||||
search_base, search_end);
|
||||
if (!crash_base) {
|
||||
/*
|
||||
* For crashkernel=size[KMG]@offset[KMG], print out failure
|
||||
* message if can't reserve the specified region.
|
||||
*/
|
||||
if (fixed_base) {
|
||||
pr_warn("crashkernel reservation failed - memory is in use.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* For crashkernel=size[KMG], if the first attempt was for
|
||||
* low memory, fall back to high memory, the minimum required
|
||||
* low memory will be reserved later.
|
||||
*/
|
||||
if (!high && search_end == CRASH_ADDR_LOW_MAX) {
|
||||
search_end = CRASH_ADDR_HIGH_MAX;
|
||||
search_base = CRASH_ADDR_LOW_MAX;
|
||||
crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
|
||||
goto retry;
|
||||
}
|
||||
|
||||
/*
|
||||
* For crashkernel=size[KMG],high, if the first attempt was
|
||||
* for high memory, fall back to low memory.
|
||||
*/
|
||||
if (high && search_end == CRASH_ADDR_HIGH_MAX) {
|
||||
search_end = CRASH_ADDR_LOW_MAX;
|
||||
search_base = 0;
|
||||
goto retry;
|
||||
}
|
||||
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
|
||||
crash_size);
|
||||
return;
|
||||
}
|
||||
|
||||
if ((crash_base >= CRASH_ADDR_LOW_MAX) &&
|
||||
crash_low_size && reserve_crashkernel_low(crash_low_size)) {
|
||||
memblock_phys_free(crash_base, crash_size);
|
||||
return;
|
||||
}
|
||||
|
||||
pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
|
||||
crash_base, crash_base + crash_size, crash_size >> 20);
|
||||
|
||||
/*
|
||||
* The crashkernel memory will be removed from the kernel linear
|
||||
* map. Inform kmemleak so that it won't try to access it.
|
||||
*/
|
||||
kmemleak_ignore_phys(crash_base);
|
||||
if (crashk_low_res.end)
|
||||
kmemleak_ignore_phys(crashk_low_res.start);
|
||||
|
||||
crashk_res.start = crash_base;
|
||||
crashk_res.end = crash_base + crash_size - 1;
|
||||
}
|
||||
|
||||
static __init int insert_crashkernel_resources(void)
|
||||
{
|
||||
if (crashk_res.start < crashk_res.end)
|
||||
insert_resource(&iomem_resource, &crashk_res);
|
||||
|
||||
if (crashk_low_res.start < crashk_low_res.end)
|
||||
insert_resource(&iomem_resource, &crashk_low_res);
|
||||
|
||||
return 0;
|
||||
}
|
||||
early_initcall(insert_crashkernel_resources);
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user