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| author | Hari Bathini <hbathini@linux.ibm.com> | 2023-09-12 10:29:50 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-09-18 04:23:27 +0200 |
| commit | b098f1c32365304633077d73e4ae21c72d4241b3 (patch) | |
| tree | 5cbf389d90d43c7596b8b405c2ad58194f6ab1da /arch/powerpc/kernel/crash_dump.c | |
| parent | vmcore: remove dependency with is_kdump_kernel() for exporting vmcore (diff) | |
| download | linux-b098f1c32365304633077d73e4ae21c72d4241b3.tar.xz linux-b098f1c32365304633077d73e4ae21c72d4241b3.zip | |
powerpc/fadump: make is_kdump_kernel() return false when fadump is active
Currently, is_kdump_kernel() returns true in crash dump capture kernel
for both kdump and fadump crash dump capturing methods, as both these
methods set elfcorehdr_addr. Some restrictions enforced for crash dump
capture kernel, based on is_kdump_kernel(), are specifically meant for
kdump case and not desirable for fadump - eg. IO queues restriction in
device drivers. So, define is_kdump_kernel() to return false when f/w
assisted dump is active.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230912082950.856977-2-hbathini@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/crash_dump.c')
| -rw-r--r-- | arch/powerpc/kernel/crash_dump.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c index 9a3b85bfc83f..2086fa6cdc25 100644 --- a/arch/powerpc/kernel/crash_dump.c +++ b/arch/powerpc/kernel/crash_dump.c @@ -19,6 +19,7 @@ #include <linux/uio.h> #include <asm/rtas.h> #include <asm/inst.h> +#include <asm/fadump.h> #ifdef DEBUG #include <asm/udbg.h> @@ -92,6 +93,17 @@ ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, return csize; } +/* + * Return true only when kexec based kernel dump capturing method is used. + * This ensures all restritions applied for kdump case are not automatically + * applied for fadump case. + */ +bool is_kdump_kernel(void) +{ + return !is_fadump_active() && elfcorehdr_addr != ELFCORE_ADDR_MAX; +} +EXPORT_SYMBOL_GPL(is_kdump_kernel); + #ifdef CONFIG_PPC_RTAS /* * The crashkernel region will almost always overlap the RTAS region, so |