Currently, is_kdump_kernel() returns true when elfcorehdr_addr is set. While elfcorehdr_addr is set for kexec based kernel dump mechanism, alternate dump capturing methods like fadump [1] also set it to export the vmcore. Since, is_kdump_kernel() is used to restrict resources in crash dump capture kernel and such restrictions are not desirable for fadump, allow is_kdump_kernel() to be defined differently for fadump case. With that change, include is_fadump_active() check in functions is_vmcore_usable() & vmcore_unusable() to be able to export vmcore for fadump case too. [1] https://docs.kernel.org/powerpc/firmware-assisted-dump.html Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx> --- Changes in v2: * is_fadump_active() check added to is_vmcore_usable() as suggested by Baoquan. include/linux/crash_dump.h | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h index 0f3a656293b0..de8a9fabfb6f 100644 --- a/include/linux/crash_dump.h +++ b/include/linux/crash_dump.h @@ -50,6 +50,7 @@ void vmcore_cleanup(void); #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) #endif +#ifndef is_kdump_kernel /* * is_kdump_kernel() checks whether this kernel is booting after a panic of * previous kernel or not. This is determined by checking if previous kernel @@ -64,6 +65,19 @@ static inline bool is_kdump_kernel(void) { return elfcorehdr_addr != ELFCORE_ADDR_MAX; } +#endif + +#ifndef is_fadump_active +/* + * If f/w assisted dump capturing mechanism (fadump), instead of kexec based + * dump capturing mechanism (kdump) is exporting the vmcore, then this function + * will be defined in arch specific code to return true, when appropriate. + */ +static inline bool is_fadump_active(void) +{ + return false; +} +#endif /* is_vmcore_usable() checks if the kernel is booting after a panic and * the vmcore region is usable. @@ -75,7 +89,8 @@ static inline bool is_kdump_kernel(void) static inline int is_vmcore_usable(void) { - return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; + return (is_kdump_kernel() || is_fadump_active()) + && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; } /* vmcore_unusable() marks the vmcore as unusable, @@ -84,7 +99,7 @@ static inline int is_vmcore_usable(void) static inline void vmcore_unusable(void) { - if (is_kdump_kernel()) + if (is_kdump_kernel() || is_fadump_active()) elfcorehdr_addr = ELFCORE_ADDR_ERR; } -- 2.41.0 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
