From d84140074c84012472b4c09a84056cd0b1f29896 Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Sat, 2 Nov 2024 17:10:14 +0800 Subject: [PATCH] powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency JIRA: https://issues.redhat.com/browse/RHEL-58641 Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Conflicts: There are conflicts - in arch/powerpc/Kconfig because of fuzz; - and - in arch/powerpc/include/asm/kexec.h, the 1st hunk - in arch/powerpc/kernel/smp.c, in crash_smp_send_stop(), both because dependency commit c7255058b543 ("powerpc/crash: save cpu register data in crash_smp_send_stop()") is not back ported yet; commit 5c4233cc0920cc90787aafe950b90f6c57a35b88 Author: Hari Bathini Date: Mon Feb 26 16:00:10 2024 +0530 powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency Remove CONFIG_CRASH_DUMP dependency on CONFIG_KEXEC. CONFIG_KEXEC_CORE was used at places where CONFIG_CRASH_DUMP or CONFIG_CRASH_RESERVE was appropriate. Replace with appropriate #ifdefs to support CONFIG_KEXEC and !CONFIG_CRASH_DUMP configuration option. Also, make CONFIG_FA_DUMP dependent on CONFIG_CRASH_DUMP to avoid unmet dependencies for FA_DUMP with !CONFIG_KEXEC_CORE configuration option. Signed-off-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://msgid.link/20240226103010.589537-4-hbathini@linux.ibm.com Signed-off-by: Baoquan He --- arch/powerpc/Kconfig | 9 +-- arch/powerpc/include/asm/kexec.h | 96 ++++++++++++++-------------- arch/powerpc/kernel/prom.c | 2 +- arch/powerpc/kernel/setup-common.c | 2 +- arch/powerpc/kernel/smp.c | 2 +- arch/powerpc/kexec/Makefile | 3 +- arch/powerpc/kexec/core.c | 4 ++ arch/powerpc/platforms/powernv/smp.c | 2 +- 8 files changed, 59 insertions(+), 61 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 70148d1dd54a..243f0b2040d3 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -529,11 +529,6 @@ config PPC64_SUPPORTS_MEMORY_FAILURE config ARCH_SUPPORTS_KEXEC def_bool (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E -config ARCH_SELECTS_KEXEC - def_bool y - depends on KEXEC - select CRASH_DUMP - config ARCH_SUPPORTS_KEXEC_FILE def_bool PPC64 @@ -544,7 +539,6 @@ config ARCH_SELECTS_KEXEC_FILE def_bool y depends on KEXEC_FILE select KEXEC_ELF - select CRASH_DUMP select BUILD_BIN2C select HAVE_IMA_KEXEC if IMA @@ -604,8 +598,7 @@ config ARCH_SELECTS_CRASH_DUMP config FA_DUMP bool "Firmware-assisted dump" - depends on PPC64 && (PPC_RTAS || PPC_POWERNV) - select CRASH_DUMP + depends on CRASH_DUMP && PPC64 && (PPC_RTAS || PPC_POWERNV) help A robust mechanism to get reliable kernel crash dump with assistance from firmware. This approach does not use kexec, diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h index 015e0e075eed..ebfcddc137f5 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -55,58 +55,18 @@ typedef void (*crash_shutdown_t)(void); #ifdef CONFIG_KEXEC_CORE - -/* - * This function is responsible for capturing register states if coming - * via panic or invoking dump using sysrq-trigger. - */ -static inline void crash_setup_regs(struct pt_regs *newregs, - struct pt_regs *oldregs) -{ - if (oldregs) - memcpy(newregs, oldregs, sizeof(*newregs)); - else - ppc_save_regs(newregs); -} +struct kimage; +struct pt_regs; extern void kexec_smp_wait(void); /* get and clear naca physid, wait for master to copy new code to 0 */ -extern int crashing_cpu; -extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)); -extern void crash_ipi_callback(struct pt_regs *); -extern int crash_wake_offline; - -struct kimage; -struct pt_regs; extern void default_machine_kexec(struct kimage *image); -extern void default_machine_crash_shutdown(struct pt_regs *regs); -extern int crash_shutdown_register(crash_shutdown_t handler); -extern int crash_shutdown_unregister(crash_shutdown_t handler); - -extern void crash_kexec_secondary(struct pt_regs *regs); -int __init overlaps_crashkernel(unsigned long start, unsigned long size); -extern void reserve_crashkernel(void); extern void machine_kexec_mask_interrupts(void); -static inline bool kdump_in_progress(void) -{ - return crashing_cpu >= 0; -} - void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer, unsigned long start_address) __noreturn; - void kexec_copy_flush(struct kimage *image); -#if defined(CONFIG_CRASH_DUMP) -bool is_kdump_kernel(void); -#define is_kdump_kernel is_kdump_kernel -#if defined(CONFIG_PPC_RTAS) -void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); -#define crash_free_reserved_phys_range crash_free_reserved_phys_range -#endif /* CONFIG_PPC_RTAS */ -#endif /* CONFIG_CRASH_DUMP */ - #ifdef CONFIG_KEXEC_FILE extern const struct kexec_file_ops kexec_elf64_ops; @@ -151,15 +111,55 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, #endif /* CONFIG_KEXEC_FILE */ -#else /* !CONFIG_KEXEC_CORE */ -static inline void crash_kexec_secondary(struct pt_regs *regs) { } +#endif /* CONFIG_KEXEC_CORE */ -static inline int overlaps_crashkernel(unsigned long start, unsigned long size) +#ifdef CONFIG_CRASH_RESERVE +int __init overlaps_crashkernel(unsigned long start, unsigned long size); +extern void reserve_crashkernel(void); +#else +static inline void reserve_crashkernel(void) {} +static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; } +#endif + +#if defined(CONFIG_CRASH_DUMP) +/* + * This function is responsible for capturing register states if coming + * via panic or invoking dump using sysrq-trigger. + */ +static inline void crash_setup_regs(struct pt_regs *newregs, + struct pt_regs *oldregs) { - return 0; + if (oldregs) + memcpy(newregs, oldregs, sizeof(*newregs)); + else + ppc_save_regs(newregs); } -static inline void reserve_crashkernel(void) { ; } +extern int crashing_cpu; +extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)); +extern void crash_ipi_callback(struct pt_regs *regs); +extern int crash_wake_offline; + +extern int crash_shutdown_register(crash_shutdown_t handler); +extern int crash_shutdown_unregister(crash_shutdown_t handler); +extern void default_machine_crash_shutdown(struct pt_regs *regs); + +extern void crash_kexec_secondary(struct pt_regs *regs); + +static inline bool kdump_in_progress(void) +{ + return crashing_cpu >= 0; +} + +bool is_kdump_kernel(void); +#define is_kdump_kernel is_kdump_kernel +#if defined(CONFIG_PPC_RTAS) +void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); +#define crash_free_reserved_phys_range crash_free_reserved_phys_range +#endif /* CONFIG_PPC_RTAS */ + +#else /* !CONFIG_CRASH_DUMP */ +static inline void crash_kexec_secondary(struct pt_regs *regs) { } static inline int crash_shutdown_register(crash_shutdown_t handler) { @@ -182,7 +182,7 @@ static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) { } -#endif /* CONFIG_KEXEC_CORE */ +#endif /* CONFIG_CRASH_DUMP */ #ifdef CONFIG_PPC_BOOK3S_64 #include diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index cfe4c4e5f627..dd60e1649dae 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -467,7 +467,7 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node, tce_alloc_end = *lprop; #endif -#ifdef CONFIG_KEXEC_CORE +#ifdef CONFIG_CRASH_RESERVE lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); if (lprop) crashk_res.start = *lprop; diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index d59f2c2fe0d9..da2f7a55bbb8 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -107,7 +107,7 @@ int ppc_do_canonicalize_irqs; EXPORT_SYMBOL(ppc_do_canonicalize_irqs); #endif -#ifdef CONFIG_VMCORE_INFO +#ifdef CONFIG_CRASH_DUMP /* This keeps a track of which one is the crashing cpu. */ int crashing_cpu = -1; #endif diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 618b238f20ff..69d1cbc159c3 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -599,7 +599,7 @@ void smp_send_debugger_break(void) } #endif -#ifdef CONFIG_KEXEC_CORE +#ifdef CONFIG_CRASH_DUMP void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) { int cpu; diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile index 91e96f5168b7..8e469c4da3f8 100644 --- a/arch/powerpc/kexec/Makefile +++ b/arch/powerpc/kexec/Makefile @@ -3,12 +3,13 @@ # Makefile for the linux kernel. # -obj-y += core.o crash.o core_$(BITS).o +obj-y += core.o core_$(BITS).o obj-$(CONFIG_PPC32) += relocate_32.o obj-$(CONFIG_KEXEC_FILE) += file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o obj-$(CONFIG_VMCORE_INFO) += vmcore_info.o +obj-$(CONFIG_CRASH_DUMP) += crash.o # Disable GCOV, KCOV & sanitizers in odd or sensitive code GCOV_PROFILE_core_$(BITS).o := n diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c index ca59e727d34e..d998dc0b5a4b 100644 --- a/arch/powerpc/kexec/core.c +++ b/arch/powerpc/kexec/core.c @@ -43,10 +43,12 @@ void machine_kexec_mask_interrupts(void) { } } +#ifdef CONFIG_CRASH_DUMP void machine_crash_shutdown(struct pt_regs *regs) { default_machine_crash_shutdown(regs); } +#endif void machine_kexec_cleanup(struct kimage *image) { @@ -76,6 +78,7 @@ void machine_kexec(struct kimage *image) for(;;); } +#ifdef CONFIG_CRASH_RESERVE void __init reserve_crashkernel(void) { unsigned long long crash_size, crash_base, total_mem_sz; @@ -250,3 +253,4 @@ static int __init kexec_setup(void) return 0; } late_initcall(kexec_setup); +#endif /* CONFIG_CRASH_RESERVE */ diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index 9e1a25398f98..8f14f0581a21 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -434,7 +434,7 @@ void __init pnv_smp_init(void) smp_ops = &pnv_smp_ops; #ifdef CONFIG_HOTPLUG_CPU -#ifdef CONFIG_KEXEC_CORE +#ifdef CONFIG_CRASH_DUMP crash_wake_offline = 1; #endif #endif