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// 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 <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)
{
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)
{
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)
{
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,
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_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,
.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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