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Commit 22bd0177 authored by Hari Bathini's avatar Hari Bathini Committed by Linus Torvalds
Browse files

powerpc/fadump: remove dependency with CONFIG_KEXEC 

Now that crashkernel parameter parsing and vmcoreinfo related code is
moved under CONFIG_CRASH_CORE instead of CONFIG_KEXEC_CORE, remove
dependency with CONFIG_KEXEC for CONFIG_FA_DUMP.  While here, get rid of
definitions of fadump_append_elf_note() & fadump_final_note() functions
to reuse similar functions compiled under CONFIG_CRASH_CORE.

Link: http://lkml.kernel.org/r/149035343956.6881.1536459326017709354.stgit@hbathini.in.ibm.com


Signed-off-by: default avatarHari Bathini <hbathini@linux.vnet.ibm.com>
Reviewed-by: default avatarMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 51dbd925

arch/powerpc/Kconfig

+6 −4
Original line number Diff line number Diff line
@@ -571,21 +571,23 @@ config RELOCATABLE_TEST 
	  relocation code.



config CRASH_DUMP

	bool "Build a kdump crash kernel"

	bool "Build a dump capture kernel"

	depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)

	select RELOCATABLE if PPC64 || 44x || FSL_BOOKE

	help

	  Build a kernel suitable for use as a kdump capture kernel.

	  Build a kernel suitable for use as a dump capture kernel.

	  The same kernel binary can be used as production kernel and dump

	  capture kernel.



config FA_DUMP

	bool "Firmware-assisted dump"

	depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE

	depends on PPC64 && PPC_RTAS

	select CRASH_CORE

	select CRASH_DUMP

	help

	  A robust mechanism to get reliable kernel crash dump with

	  assistance from firmware. This approach does not use kexec,

	  instead firmware assists in booting the kdump kernel

	  instead firmware assists in booting the capture kernel

	  while preserving memory contents. Firmware-assisted dump

	  is meant to be a kdump replacement offering robustness and

	  speed not possible without system firmware assistance.

arch/powerpc/include/asm/fadump.h

+2 −0
Original line number Diff line number Diff line
@@ -73,6 +73,8 @@ 
	reg_entry++;							\

})



extern int crashing_cpu;



/* Kernel Dump section info */

struct fadump_section {

	__be32	request_flag;

arch/powerpc/kernel/crash.c

+0 −2
Original line number Diff line number Diff line
@@ -43,8 +43,6 @@ 
#define IPI_TIMEOUT		10000

#define REAL_MODE_TIMEOUT	10000



/* This keeps a track of which one is the crashing cpu. */

int crashing_cpu = -1;

static int time_to_dump;



#define CRASH_HANDLER_MAX 3

arch/powerpc/kernel/fadump.c

+3 −31
Original line number Diff line number Diff line
@@ -527,34 +527,6 @@ fadump_read_registers(struct fadump_reg_entry *reg_entry, struct pt_regs *regs) 
	return reg_entry;

}



static u32 *fadump_append_elf_note(u32 *buf, char *name, unsigned type,

						void *data, size_t data_len)

{

	struct elf_note note;



	note.n_namesz = strlen(name) + 1;

	note.n_descsz = data_len;

	note.n_type   = type;

	memcpy(buf, &note, sizeof(note));

	buf += (sizeof(note) + 3)/4;

	memcpy(buf, name, note.n_namesz);

	buf += (note.n_namesz + 3)/4;

	memcpy(buf, data, note.n_descsz);

	buf += (note.n_descsz + 3)/4;



	return buf;

}



static void fadump_final_note(u32 *buf)

{

	struct elf_note note;



	note.n_namesz = 0;

	note.n_descsz = 0;

	note.n_type   = 0;

	memcpy(buf, &note, sizeof(note));

}



static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)

{

	struct elf_prstatus prstatus;
@@ -565,7 +537,7 @@ static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs) 
	 * prstatus.pr_pid = ????

	 */

	elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);

	buf = fadump_append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,

	buf = append_elf_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS,

			      &prstatus, sizeof(prstatus));

	return buf;

}
@@ -707,7 +679,7 @@ static int __init fadump_build_cpu_notes(const struct fadump_mem_struct *fdm) 
			note_buf = fadump_regs_to_elf_notes(note_buf, &regs);

		}

	}

	fadump_final_note(note_buf);

	final_note(note_buf);



	if (fdh) {

		pr_debug("Updating elfcore header (%llx) with cpu notes\n",

arch/powerpc/kernel/setup-common.c

+5 −0
Original line number Diff line number Diff line
@@ -125,6 +125,11 @@ int ppc_do_canonicalize_irqs; 
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);

#endif



#ifdef CONFIG_CRASH_CORE

/* This keeps a track of which one is the crashing cpu. */

int crashing_cpu = -1;

#endif



/* also used by kexec */

void machine_shutdown(void)

{