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Commit d34c5f26 authored by Mahesh Salgaonkar's avatar Mahesh Salgaonkar Committed by Benjamin Herrenschmidt
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fadump: Add PT_NOTE program header for vmcoreinfo 



Introduce a PT_NOTE program header that points to physical address of
vmcoreinfo_note buffer declared in kernel/kexec.c. The vmcoreinfo
note buffer is populated during crash_fadump() at the time of system
crash.

Signed-off-by: default avatarMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent ebaeb5ae

arch/powerpc/kernel/fadump.c

+29 −0
Original line number Diff line number Diff line
@@ -814,6 +814,19 @@ static void fadump_setup_crash_memory_ranges(void) 
	}

}



/*

 * If the given physical address falls within the boot memory region then

 * return the relocated address that points to the dump region reserved

 * for saving initial boot memory contents.

 */

static inline unsigned long fadump_relocate(unsigned long paddr)

{

	if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)

		return fdm.rmr_region.destination_address + paddr;

	else

		return paddr;

}



static int fadump_create_elfcore_headers(char *bufp)

{

	struct elfhdr *elf;
@@ -845,6 +858,22 @@ static int fadump_create_elfcore_headers(char *bufp) 


	(elf->e_phnum)++;



	/* setup ELF PT_NOTE for vmcoreinfo */

	phdr = (struct elf_phdr *)bufp;

	bufp += sizeof(struct elf_phdr);

	phdr->p_type	= PT_NOTE;

	phdr->p_flags	= 0;

	phdr->p_vaddr	= 0;

	phdr->p_align	= 0;



	phdr->p_paddr	= fadump_relocate(paddr_vmcoreinfo_note());

	phdr->p_offset	= phdr->p_paddr;

	phdr->p_memsz	= vmcoreinfo_max_size;

	phdr->p_filesz	= vmcoreinfo_max_size;



	/* Increment number of program headers. */

	(elf->e_phnum)++;



	/* setup PT_LOAD sections. */



	for (i = 0; i < crash_mem_ranges; i++) {