/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Firmware-Assisted Dump support on POWER platform (OPAL).
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*
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* Copyright 2019, Hari Bathini, IBM Corporation.
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*/
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#ifndef _POWERNV_OPAL_FADUMP_H
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#define _POWERNV_OPAL_FADUMP_H
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#include <asm/reg.h>
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/*
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* With kernel & initrd loaded at 512MB (with 256MB size), enforce a minimum
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* boot memory size of 768MB to ensure f/w loading kernel and initrd doesn't
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* mess with crash'ed kernel's memory during MPIPL.
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*/
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#define OPAL_FADUMP_MIN_BOOT_MEM (0x30000000UL)
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/*
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* OPAL FADump metadata structure format version
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*
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* OPAL FADump kernel metadata structure stores kernel metadata needed to
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* register-for/process crash dump. Format version is used to keep a tab on
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* the changes in the structure format. The changes, if any, to the format
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* are expected to be minimal and backward compatible.
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*/
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#define OPAL_FADUMP_VERSION 0x1
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/*
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* OPAL FADump kernel metadata
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*
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* The address of this structure will be registered with f/w for retrieving
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* in the capture kernel to process the crash dump.
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*/
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struct opal_fadump_mem_struct {
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u8 version;
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u8 reserved[3];
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__be16 region_cnt; /* number of regions */
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__be16 registered_regions; /* Regions registered for MPIPL */
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__be64 fadumphdr_addr;
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struct opal_mpipl_region rgn[FADUMP_MAX_MEM_REGS];
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} __packed;
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/*
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* CPU state data
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*
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* CPU state data information is provided by f/w. The format for this data
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* is defined in the HDAT spec. Version is used to keep a tab on the changes
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* in this CPU state data format. Changes to this format are unlikely, but
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* if there are any changes, please refer to latest HDAT specification.
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*/
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#define HDAT_FADUMP_CPU_DATA_VER 1
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#define HDAT_FADUMP_CORE_INACTIVE (0x0F)
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/* HDAT thread header for register entries */
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struct hdat_fadump_thread_hdr {
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__be32 pir;
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/* 0x00 - 0x0F - The corresponding stop state of the core */
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u8 core_state;
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u8 reserved[3];
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__be32 offset; /* Offset to Register Entries array */
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__be32 ecnt; /* Number of entries */
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__be32 esize; /* Alloc size of each array entry in bytes */
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__be32 eactsz; /* Actual size of each array entry in bytes */
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} __packed;
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/* Register types populated by f/w */
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#define HDAT_FADUMP_REG_TYPE_GPR 0x01
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#define HDAT_FADUMP_REG_TYPE_SPR 0x02
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/* ID numbers used by f/w while populating certain registers */
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#define HDAT_FADUMP_REG_ID_NIP 0x7D0
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#define HDAT_FADUMP_REG_ID_MSR 0x7D1
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#define HDAT_FADUMP_REG_ID_CCR 0x7D2
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/* HDAT register entry. */
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struct hdat_fadump_reg_entry {
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__be32 reg_type;
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__be32 reg_num;
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__be64 reg_val;
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} __packed;
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static inline void opal_fadump_set_regval_regnum(struct pt_regs *regs,
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u32 reg_type, u32 reg_num,
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u64 reg_val)
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{
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if (reg_type == HDAT_FADUMP_REG_TYPE_GPR) {
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if (reg_num < 32)
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regs->gpr[reg_num] = reg_val;
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return;
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}
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switch (reg_num) {
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case SPRN_CTR:
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regs->ctr = reg_val;
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break;
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case SPRN_LR:
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regs->link = reg_val;
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break;
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case SPRN_XER:
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regs->xer = reg_val;
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break;
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case SPRN_DAR:
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regs->dar = reg_val;
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break;
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case SPRN_DSISR:
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regs->dsisr = reg_val;
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break;
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case HDAT_FADUMP_REG_ID_NIP:
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regs->nip = reg_val;
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break;
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case HDAT_FADUMP_REG_ID_MSR:
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regs->msr = reg_val;
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break;
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case HDAT_FADUMP_REG_ID_CCR:
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regs->ccr = reg_val;
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break;
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}
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}
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static inline void opal_fadump_read_regs(char *bufp, unsigned int regs_cnt,
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unsigned int reg_entry_size,
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bool cpu_endian,
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struct pt_regs *regs)
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{
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struct hdat_fadump_reg_entry *reg_entry;
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u64 val;
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int i;
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memset(regs, 0, sizeof(struct pt_regs));
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for (i = 0; i < regs_cnt; i++, bufp += reg_entry_size) {
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reg_entry = (struct hdat_fadump_reg_entry *)bufp;
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val = (cpu_endian ? be64_to_cpu(reg_entry->reg_val) :
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(u64)(reg_entry->reg_val));
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opal_fadump_set_regval_regnum(regs,
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be32_to_cpu(reg_entry->reg_type),
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be32_to_cpu(reg_entry->reg_num),
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val);
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}
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}
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#endif /* _POWERNV_OPAL_FADUMP_H */
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