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d3833a7010
Introduce callback functions for platform specific operations like register, unregister, invalidate & such. Also, define place-holders for the same on pSeries platform. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821330286.5656.15538934400074110770.stgit@hbathini.in.ibm.com
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Firmware-Assisted Dump support on POWERVM platform.
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*
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* Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
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* Copyright 2019, Hari Bathini, IBM Corporation.
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*/
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#define pr_fmt(fmt) "rtas fadump: " fmt
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#include <linux/string.h>
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#include <linux/memblock.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/crash_dump.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/fadump.h>
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#include <asm/fadump-internal.h>
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#include "rtas-fadump.h"
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static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
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{
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return fadump_conf->reserve_dump_area_start;
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}
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static int rtas_fadump_register(struct fw_dump *fadump_conf)
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{
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return -EIO;
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}
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static int rtas_fadump_unregister(struct fw_dump *fadump_conf)
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{
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return -EIO;
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}
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static int rtas_fadump_invalidate(struct fw_dump *fadump_conf)
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{
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return -EIO;
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}
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/*
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* Validate and process the dump data stored by firmware before exporting
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* it through '/proc/vmcore'.
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*/
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static int __init rtas_fadump_process(struct fw_dump *fadump_conf)
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{
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return -EINVAL;
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}
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static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
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struct seq_file *m)
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{
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}
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static void rtas_fadump_trigger(struct fadump_crash_info_header *fdh,
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const char *msg)
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{
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/* Call ibm,os-term rtas call to trigger firmware assisted dump */
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rtas_os_term((char *)msg);
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}
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static struct fadump_ops rtas_fadump_ops = {
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.fadump_init_mem_struct = rtas_fadump_init_mem_struct,
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.fadump_register = rtas_fadump_register,
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.fadump_unregister = rtas_fadump_unregister,
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.fadump_invalidate = rtas_fadump_invalidate,
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.fadump_process = rtas_fadump_process,
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.fadump_region_show = rtas_fadump_region_show,
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.fadump_trigger = rtas_fadump_trigger,
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};
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void __init rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
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{
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int i, size, num_sections;
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const __be32 *sections;
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const __be32 *token;
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/*
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* Check if Firmware Assisted dump is supported. if yes, check
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* if dump has been initiated on last reboot.
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*/
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token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
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if (!token)
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return;
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fadump_conf->ibm_configure_kernel_dump = be32_to_cpu(*token);
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fadump_conf->ops = &rtas_fadump_ops;
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fadump_conf->fadump_supported = 1;
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/* Get the sizes required to store dump data for the firmware provided
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* dump sections.
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* For each dump section type supported, a 32bit cell which defines
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* the ID of a supported section followed by two 32 bit cells which
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* gives the size of the section in bytes.
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*/
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sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
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&size);
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if (!sections)
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return;
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num_sections = size / (3 * sizeof(u32));
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for (i = 0; i < num_sections; i++, sections += 3) {
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u32 type = (u32)of_read_number(sections, 1);
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switch (type) {
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case RTAS_FADUMP_CPU_STATE_DATA:
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fadump_conf->cpu_state_data_size =
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of_read_ulong(§ions[1], 2);
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break;
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case RTAS_FADUMP_HPTE_REGION:
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fadump_conf->hpte_region_size =
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of_read_ulong(§ions[1], 2);
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break;
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}
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}
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}
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