Commit 41df5928 authored by Hari Bathini's avatar Hari Bathini Committed by Michael Ellerman
Browse files

powerpc/fadump: add fadump support on powernv 



Add basic callback functions for FADump on PowerNV platform.

Signed-off-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821342072.5656.4346362203141486452.stgit@hbathini.in.ibm.com
parent 6f5f193e

arch/powerpc/Kconfig

+3 −2
Original line number Diff line number Diff line
@@ -569,7 +569,7 @@ config CRASH_DUMP 


config FA_DUMP

	bool "Firmware-assisted dump"

	depends on PPC64 && PPC_RTAS

	depends on PPC64 && (PPC_RTAS || PPC_POWERNV)

	select CRASH_CORE

	select CRASH_DUMP

	help
@@ -580,7 +580,8 @@ config FA_DUMP 
	  is meant to be a kdump replacement offering robustness and

	  speed not possible without system firmware assistance.



	  If unsure, say "N"

	  If unsure, say "y". Only special kernels like petitboot may

	  need to say "N" here.



config IRQ_ALL_CPUS

	bool "Distribute interrupts on all CPUs by default"

arch/powerpc/include/asm/fadump-internal.h

+7 −0
Original line number Diff line number Diff line
@@ -135,4 +135,11 @@ static inline void 
rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }

#endif



#ifdef CONFIG_PPC_POWERNV

extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);

#else

static inline void

opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }

#endif



#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */

arch/powerpc/kernel/fadump.c

+12 −3
Original line number Diff line number Diff line
@@ -107,13 +107,22 @@ static int __init fadump_cma_init(void) { return 1; } 
int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,

				      int depth, void *data)

{

	if (depth != 1 || strcmp(uname, "rtas") != 0)

	if (depth != 1)

		return 0;



	if (strcmp(uname, "rtas") == 0) {

		rtas_fadump_dt_scan(&fw_dump, node);

		return 1;

	}



	if (strcmp(uname, "ibm,opal") == 0) {

		opal_fadump_dt_scan(&fw_dump, node);

		return 1;

	}



	return 0;

}



/*

 * If fadump is registered, check if the memory provided

 * falls within boot memory area and reserved memory area.

arch/powerpc/platforms/powernv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o 
obj-y			+= ultravisor.o



obj-$(CONFIG_SMP)	+= smp.o subcore.o subcore-asm.o

obj-$(CONFIG_FA_DUMP)	+= opal-fadump.o

obj-$(CONFIG_PCI)	+= pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o

obj-$(CONFIG_CXL_BASE)	+= pci-cxl.o

obj-$(CONFIG_EEH)	+= eeh-powernv.o

arch/powerpc/platforms/powernv/opal-fadump.c

0 → 100644
+92 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Firmware-Assisted Dump support on POWER platform (OPAL).

 *

 * Copyright 2019, Hari Bathini, IBM Corporation.

 */



#define pr_fmt(fmt) "opal fadump: " fmt



#include <linux/string.h>

#include <linux/seq_file.h>

#include <linux/of_fdt.h>

#include <linux/libfdt.h>



#include <asm/opal.h>

#include <asm/fadump-internal.h>



static u64 opal_fadump_init_mem_struct(struct fw_dump *fadump_conf)

{

	return fadump_conf->reserve_dump_area_start;

}



static int opal_fadump_register(struct fw_dump *fadump_conf)

{

	return -EIO;

}



static int opal_fadump_unregister(struct fw_dump *fadump_conf)

{

	return -EIO;

}



static int opal_fadump_invalidate(struct fw_dump *fadump_conf)

{

	return -EIO;

}



static int __init opal_fadump_process(struct fw_dump *fadump_conf)

{

	return -EINVAL;

}



static void opal_fadump_region_show(struct fw_dump *fadump_conf,

				    struct seq_file *m)

{

}



static void opal_fadump_trigger(struct fadump_crash_info_header *fdh,

				const char *msg)

{

	int rc;



	rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, msg);

	if (rc == OPAL_UNSUPPORTED) {

		pr_emerg("Reboot type %d not supported.\n",

			 OPAL_REBOOT_MPIPL);

	} else if (rc == OPAL_HARDWARE)

		pr_emerg("No backend support for MPIPL!\n");

}



static struct fadump_ops opal_fadump_ops = {

	.fadump_init_mem_struct		= opal_fadump_init_mem_struct,

	.fadump_register		= opal_fadump_register,

	.fadump_unregister		= opal_fadump_unregister,

	.fadump_invalidate		= opal_fadump_invalidate,

	.fadump_process			= opal_fadump_process,

	.fadump_region_show		= opal_fadump_region_show,

	.fadump_trigger			= opal_fadump_trigger,

};



void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)

{

	unsigned long dn;



	/*

	 * Check if Firmware-Assisted Dump is supported. if yes, check

	 * if dump has been initiated on last reboot.

	 */

	dn = of_get_flat_dt_subnode_by_name(node, "dump");

	if (dn == -FDT_ERR_NOTFOUND) {

		pr_debug("FADump support is missing!\n");

		return;

	}



	if (!of_flat_dt_is_compatible(dn, "ibm,opal-dump")) {

		pr_err("Support missing for this f/w version!\n");

		return;

	}



	fadump_conf->ops		= &opal_fadump_ops;

	fadump_conf->fadump_supported	= 1;

}