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powerpc/fadump: make is_kdump_kernel() return false when fadump is active

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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
This commit is contained in:
Hari Bathini 2023-09-12 13:59:50 +05:30 • committed by Michael Ellerman
parent 86328b338c
commit b098f1c323
2 changed files with 18 additions and 2 deletions
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8
arch/powerpc/include/asm/kexec.h
View file

@ -99,10 +99,14 @@ void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_co
void kexec_copy_flush(struct kimage *image);
#if defined(CONFIG_CRASH_DUMP) && defined(CONFIG_PPC_RTAS)
#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
#endif /* CONFIG_PPC_RTAS */
#endif /* CONFIG_CRASH_DUMP */
#ifdef CONFIG_KEXEC_FILE
extern const struct kexec_file_ops kexec_elf64_ops;

12
arch/powerpc/kernel/crash_dump.c
View file

@ -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