diff options
author | Hari Bathini <hbathini@linux.ibm.com> | 2019-09-11 20:20:57 +0530 |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-14 00:04:43 +1000 |
commit | 742a265accd3e3afcc8e7b17f409c93c1de8be85 (patch) | |
tree | 134a9dce27087f15d67dd637a7cb0175709ca457 /arch/powerpc/platforms | |
parent | 6abec12c65e8870d8cafe154a86240fe0bcdd4f7 (diff) | |
download | linux-742a265accd3e3afcc8e7b17f409c93c1de8be85.tar.bz2 |
powerpc/fadump: register kernel metadata address with opal
OPAL allows registering address with it in the first kernel and
retrieving it after MPIPL. Setup kernel metadata and register its
address with OPAL to use it for processing the crash dump.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821345011.5656.13567765019032928471.stgit@hbathini.in.ibm.com
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r-- | arch/powerpc/platforms/powernv/opal-fadump.c | 84 | ||||
-rw-r--r-- | arch/powerpc/platforms/powernv/opal-fadump.h | 39 |
2 files changed, 122 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c index bbc5356bdc77..21de832f2ba4 100644 --- a/arch/powerpc/platforms/powernv/opal-fadump.c +++ b/arch/powerpc/platforms/powernv/opal-fadump.c @@ -11,13 +11,83 @@ #include <linux/seq_file.h> #include <linux/of_fdt.h> #include <linux/libfdt.h> +#include <linux/mm.h> +#include <asm/page.h> #include <asm/opal.h> #include <asm/fadump-internal.h> +#include "opal-fadump.h" + +static struct opal_fadump_mem_struct *opal_fdm; + +/* Initialize kernel metadata */ +static void opal_fadump_init_metadata(struct opal_fadump_mem_struct *fdm) +{ + fdm->version = OPAL_FADUMP_VERSION; + fdm->region_cnt = 0; + fdm->registered_regions = 0; + fdm->fadumphdr_addr = 0; +} + static u64 opal_fadump_init_mem_struct(struct fw_dump *fadump_conf) { - return fadump_conf->reserve_dump_area_start; + u64 addr = fadump_conf->reserve_dump_area_start; + + opal_fdm = __va(fadump_conf->kernel_metadata); + opal_fadump_init_metadata(opal_fdm); + + opal_fdm->region_cnt = 1; + opal_fdm->rgn[0].src = 0; + opal_fdm->rgn[0].dest = addr; + opal_fdm->rgn[0].size = fadump_conf->boot_memory_size; + addr += fadump_conf->boot_memory_size; + + /* + * Kernel metadata is passed to f/w and retrieved in capture kerenl. + * So, use it to save fadump header address instead of calculating it. + */ + opal_fdm->fadumphdr_addr = (opal_fdm->rgn[0].dest + + fadump_conf->boot_memory_size); + + return addr; +} + +static u64 opal_fadump_get_metadata_size(void) +{ + return PAGE_ALIGN(sizeof(struct opal_fadump_mem_struct)); +} + +static int opal_fadump_setup_metadata(struct fw_dump *fadump_conf) +{ + int err = 0; + s64 ret; + + /* + * Use the last page(s) in FADump memory reservation for + * kernel metadata. + */ + fadump_conf->kernel_metadata = (fadump_conf->reserve_dump_area_start + + fadump_conf->reserve_dump_area_size - + opal_fadump_get_metadata_size()); + pr_info("Kernel metadata addr: %llx\n", fadump_conf->kernel_metadata); + + /* Initialize kernel metadata before registering the address with f/w */ + opal_fdm = __va(fadump_conf->kernel_metadata); + opal_fadump_init_metadata(opal_fdm); + + /* + * Register metadata address with f/w. Can be retrieved in + * the capture kernel. + */ + ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_KERNEL, + fadump_conf->kernel_metadata); + if (ret != OPAL_SUCCESS) { + pr_err("Failed to set kernel metadata tag!\n"); + err = -EPERM; + } + + return err; } static int opal_fadump_register(struct fw_dump *fadump_conf) @@ -43,6 +113,16 @@ static int __init opal_fadump_process(struct fw_dump *fadump_conf) static void opal_fadump_region_show(struct fw_dump *fadump_conf, struct seq_file *m) { + const struct opal_fadump_mem_struct *fdm_ptr = opal_fdm; + u64 dumped_bytes = 0; + int i; + + for (i = 0; i < fdm_ptr->region_cnt; i++) { + seq_printf(m, "DUMP: Src: %#016llx, Dest: %#016llx, ", + fdm_ptr->rgn[i].src, fdm_ptr->rgn[i].dest); + seq_printf(m, "Size: %#llx, Dumped: %#llx bytes\n", + fdm_ptr->rgn[i].size, dumped_bytes); + } } static void opal_fadump_trigger(struct fadump_crash_info_header *fdh, @@ -60,6 +140,8 @@ static void opal_fadump_trigger(struct fadump_crash_info_header *fdh, static struct fadump_ops opal_fadump_ops = { .fadump_init_mem_struct = opal_fadump_init_mem_struct, + .fadump_get_metadata_size = opal_fadump_get_metadata_size, + .fadump_setup_metadata = opal_fadump_setup_metadata, .fadump_register = opal_fadump_register, .fadump_unregister = opal_fadump_unregister, .fadump_invalidate = opal_fadump_invalidate, diff --git a/arch/powerpc/platforms/powernv/opal-fadump.h b/arch/powerpc/platforms/powernv/opal-fadump.h new file mode 100644 index 000000000000..0b83d895485c --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-fadump.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Firmware-Assisted Dump support on POWER platform (OPAL). + * + * Copyright 2019, Hari Bathini, IBM Corporation. + */ + +#ifndef _POWERNV_OPAL_FADUMP_H +#define _POWERNV_OPAL_FADUMP_H + +/* + * OPAL FADump metadata structure format version + * + * OPAL FADump kernel metadata structure stores kernel metadata needed to + * register-for/process crash dump. Format version is used to keep a tab on + * the changes in the structure format. The changes, if any, to the format + * are expected to be minimal and backward compatible. + */ +#define OPAL_FADUMP_VERSION 0x1 + +/* Maximum number of memory regions kernel supports */ +#define OPAL_FADUMP_MAX_MEM_REGS 128 + +/* + * OPAL FADump kernel metadata + * + * The address of this structure will be registered with f/w for retrieving + * and processing during crash dump. + */ +struct opal_fadump_mem_struct { + u8 version; + u8 reserved[3]; + u16 region_cnt; /* number of regions */ + u16 registered_regions; /* Regions registered for MPIPL */ + u64 fadumphdr_addr; + struct opal_mpipl_region rgn[OPAL_FADUMP_MAX_MEM_REGS]; +} __packed; + +#endif /* _POWERNV_OPAL_FADUMP_H */ |