1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Firmware-Assisted Dump support on POWER platform (OPAL).
5 * Copyright 2019, Hari Bathini, IBM Corporation.
8 #ifndef _POWERNV_OPAL_FADUMP_H
9 #define _POWERNV_OPAL_FADUMP_H
14 * With kernel & initrd loaded at 512MB (with 256MB size), enforce a minimum
15 * boot memory size of 768MB to ensure f/w loading kernel and initrd doesn't
16 * mess with crash'ed kernel's memory during MPIPL.
18 #define OPAL_FADUMP_MIN_BOOT_MEM (0x30000000UL)
21 * OPAL FADump metadata structure format version
23 * OPAL FADump kernel metadata structure stores kernel metadata needed to
24 * register-for/process crash dump. Format version is used to keep a tab on
25 * the changes in the structure format. The changes, if any, to the format
26 * are expected to be minimal and backward compatible.
28 #define OPAL_FADUMP_VERSION 0x1
31 * OPAL FADump kernel metadata
33 * The address of this structure will be registered with f/w for retrieving
34 * in the capture kernel to process the crash dump.
36 struct opal_fadump_mem_struct {
39 __be16 region_cnt; /* number of regions */
40 __be16 registered_regions; /* Regions registered for MPIPL */
41 __be64 fadumphdr_addr;
42 struct opal_mpipl_region rgn[FADUMP_MAX_MEM_REGS];
48 * CPU state data information is provided by f/w. The format for this data
49 * is defined in the HDAT spec. Version is used to keep a tab on the changes
50 * in this CPU state data format. Changes to this format are unlikely, but
51 * if there are any changes, please refer to latest HDAT specification.
53 #define HDAT_FADUMP_CPU_DATA_VER 1
55 #define HDAT_FADUMP_CORE_INACTIVE (0x0F)
57 /* HDAT thread header for register entries */
58 struct hdat_fadump_thread_hdr {
60 /* 0x00 - 0x0F - The corresponding stop state of the core */
64 __be32 offset; /* Offset to Register Entries array */
65 __be32 ecnt; /* Number of entries */
66 __be32 esize; /* Alloc size of each array entry in bytes */
67 __be32 eactsz; /* Actual size of each array entry in bytes */
70 /* Register types populated by f/w */
71 #define HDAT_FADUMP_REG_TYPE_GPR 0x01
72 #define HDAT_FADUMP_REG_TYPE_SPR 0x02
74 /* ID numbers used by f/w while populating certain registers */
75 #define HDAT_FADUMP_REG_ID_NIP 0x7D0
76 #define HDAT_FADUMP_REG_ID_MSR 0x7D1
77 #define HDAT_FADUMP_REG_ID_CCR 0x7D2
79 /* HDAT register entry. */
80 struct hdat_fadump_reg_entry {
86 static inline void opal_fadump_set_regval_regnum(struct pt_regs *regs,
87 u32 reg_type, u32 reg_num,
90 if (reg_type == HDAT_FADUMP_REG_TYPE_GPR) {
92 regs->gpr[reg_num] = reg_val;
101 regs->link = reg_val;
110 regs->dsisr = reg_val;
112 case HDAT_FADUMP_REG_ID_NIP:
115 case HDAT_FADUMP_REG_ID_MSR:
118 case HDAT_FADUMP_REG_ID_CCR:
124 static inline void opal_fadump_read_regs(char *bufp, unsigned int regs_cnt,
125 unsigned int reg_entry_size,
127 struct pt_regs *regs)
129 struct hdat_fadump_reg_entry *reg_entry;
133 memset(regs, 0, sizeof(struct pt_regs));
135 for (i = 0; i < regs_cnt; i++, bufp += reg_entry_size) {
136 reg_entry = (struct hdat_fadump_reg_entry *)bufp;
137 val = (cpu_endian ? be64_to_cpu(reg_entry->reg_val) :
138 (u64)(reg_entry->reg_val));
139 opal_fadump_set_regval_regnum(regs,
140 be32_to_cpu(reg_entry->reg_type),
141 be32_to_cpu(reg_entry->reg_num),
146 #endif /* _POWERNV_OPAL_FADUMP_H */