Add basic callback functions for FADump on PowerNV platform. Signed-off-by: Hari Bathini <hbath...@linux.ibm.com> --- arch/powerpc/Kconfig | 5 + arch/powerpc/kernel/fadump-common.h | 9 ++ arch/powerpc/kernel/fadump.c | 3 + arch/powerpc/platforms/powernv/Makefile | 1 arch/powerpc/platforms/powernv/opal-fadump.c | 97 ++++++++++++++++++++++++++ 5 files changed, 113 insertions(+), 2 deletions(-) create mode 100644 arch/powerpc/platforms/powernv/opal-fadump.c
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index d8dcd88..fc4ecfe 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -566,7 +566,7 @@ 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 @@ -577,7 +577,8 @@ 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" diff --git a/arch/powerpc/kernel/fadump-common.h b/arch/powerpc/kernel/fadump-common.h index d2c5b16..f6c52d3 100644 --- a/arch/powerpc/kernel/fadump-common.h +++ b/arch/powerpc/kernel/fadump-common.h @@ -140,4 +140,13 @@ static inline int rtas_fadump_dt_scan(struct fw_dump *fadump_config, ulong node) } #endif +#ifdef CONFIG_PPC_POWERNV +extern int opal_fadump_dt_scan(struct fw_dump *fadump_config, ulong node); +#else +static inline int opal_fadump_dt_scan(struct fw_dump *fadump_config, ulong node) +{ + return 1; +} +#endif + #endif /* __PPC64_FA_DUMP_INTERNAL_H__ */ diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index f7c8073..b8061fb9 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -114,6 +114,9 @@ int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, if (strcmp(uname, "rtas") == 0) return rtas_fadump_dt_scan(&fw_dump, node); + if (strcmp(uname, "ibm,opal") == 0) + return opal_fadump_dt_scan(&fw_dump, node); + return 0; } diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index da2e99e..43a6e1c 100644 --- a/arch/powerpc/platforms/powernv/Makefile +++ b/arch/powerpc/platforms/powernv/Makefile @@ -6,6 +6,7 @@ obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.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 diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c new file mode 100644 index 0000000..e330877 --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-fadump.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Firmware-Assisted Dump support on POWER platform (OPAL). + * + * Copyright 2019, IBM Corp. + * Author: Hari Bathini <hbath...@linux.ibm.com> + */ + +#undef DEBUG +#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 "../../kernel/fadump-common.h" + +static ulong 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, +}; + +int __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, ulong 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 1; + } + + if (!of_flat_dt_is_compatible(dn, "ibm,opal-dump")) { + pr_err("Support missing for this f/w version!\n"); + return 1; + } + + fadump_conf->ops = &opal_fadump_ops; + fadump_conf->fadump_supported = 1; + + return 1; +}