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

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
......@@ -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"
......
......@@ -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 */
......@@ -107,11 +107,20 @@ 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;
}
/*
......
......@@ -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
......
// 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;
}
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