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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Firmware-Assisted Dump internal code.
*
* Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
* Copyright 2019, Hari Bathini, IBM Corporation.
*/
#ifndef _ASM_POWERPC_FADUMP_INTERNAL_H
#define _ASM_POWERPC_FADUMP_INTERNAL_H
/* Maximum number of memory regions kernel supports */
#define FADUMP_MAX_MEM_REGS 128
#ifndef CONFIG_PRESERVE_FA_DUMP
/* The upper limit percentage for user specified boot memory size (25%) */
#define MAX_BOOT_MEM_RATIO 4
#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
/* FAD commands */
#define FADUMP_REGISTER 1
#define FADUMP_UNREGISTER 2
#define FADUMP_INVALIDATE 3
/*
* Copy the ascii values for first 8 characters from a string into u64
* variable at their respective indexes.
* e.g.
* The string "FADMPINF" will be converted into 0x4641444d50494e46
*/
static inline u64 fadump_str_to_u64(const char *str)
{
u64 val = 0;
int i;
for (i = 0; i < sizeof(val); i++)
val = (*str) ? (val << 8) | *str++ : val << 8;
return val;
}
#define FADUMP_CPU_UNKNOWN (~((u32)0))
/*
* The introduction of new fields in the fadump crash info header has
* led to a change in the magic key from `FADMPINF` to `FADMPSIG` for
* identifying a kernel crash from an old kernel.
*
* To prevent the need for further changes to the magic number in the
* event of future modifications to the fadump crash info header, a
* version field has been introduced to track the fadump crash info
* header version.
*
* Consider a few points before adding new members to the fadump crash info
* header structure:
*
* - Append new members; avoid adding them in between.
* - Non-primitive members should have a size member as well.
* - For every change in the fadump header, increment the
* fadump header version. This helps the updated kernel decide how to
* handle kernel dumps from older kernels.
*/
#define FADUMP_CRASH_INFO_MAGIC_OLD fadump_str_to_u64("FADMPINF")
#define FADUMP_CRASH_INFO_MAGIC fadump_str_to_u64("FADMPSIG")
#define FADUMP_HEADER_VERSION 1
/* fadump crash info structure */
struct fadump_crash_info_header {
u64 magic_number;
u32 version;
u32 crashing_cpu;
u64 vmcoreinfo_raddr;
u64 vmcoreinfo_size;
u32 pt_regs_sz;
u32 cpu_mask_sz;
struct pt_regs regs;
struct cpumask cpu_mask;
};
struct fadump_memory_range {
u64 base;
u64 size;
};
/* fadump memory ranges info */
#define RNG_NAME_SZ 16
struct fadump_mrange_info {
char name[RNG_NAME_SZ];
struct fadump_memory_range *mem_ranges;
u32 mem_ranges_sz;
u32 mem_range_cnt;
u32 max_mem_ranges;
bool is_static;
};
/* Platform specific callback functions */
struct fadump_ops;
/* Firmware-assisted dump configuration details. */
struct fw_dump {
unsigned long reserve_dump_area_start;
unsigned long reserve_dump_area_size;
/* cmd line option during boot */
unsigned long reserve_bootvar;
unsigned long cpu_state_data_size;
u64 cpu_state_dest_vaddr;
u32 cpu_state_data_version;
u32 cpu_state_entry_size;
unsigned long hpte_region_size;
unsigned long boot_memory_size;
u64 boot_mem_dest_addr;
u64 boot_mem_addr[FADUMP_MAX_MEM_REGS];
u64 boot_mem_sz[FADUMP_MAX_MEM_REGS];
u64 boot_mem_top;
u64 boot_mem_regs_cnt;
unsigned long fadumphdr_addr;
u64 elfcorehdr_addr;
u64 elfcorehdr_size;
unsigned long cpu_notes_buf_vaddr;
unsigned long cpu_notes_buf_size;
unsigned long param_area;
/*
* Maximum size supported by firmware to copy from source to
* destination address per entry.
*/
u64 max_copy_size;
u64 kernel_metadata;
int ibm_configure_kernel_dump;
unsigned long fadump_enabled:1;
unsigned long fadump_supported:1;
unsigned long dump_active:1;
unsigned long dump_registered:1;
unsigned long nocma:1;
unsigned long param_area_supported:1;
struct fadump_ops *ops;
};
struct fadump_ops {
u64 (*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
u64 (*fadump_get_metadata_size)(void);
int (*fadump_setup_metadata)(struct fw_dump *fadump_conf);
u64 (*fadump_get_bootmem_min)(void);
int (*fadump_register)(struct fw_dump *fadump_conf);
int (*fadump_unregister)(struct fw_dump *fadump_conf);
int (*fadump_invalidate)(struct fw_dump *fadump_conf);
void (*fadump_cleanup)(struct fw_dump *fadump_conf);
int (*fadump_process)(struct fw_dump *fadump_conf);
void (*fadump_region_show)(struct fw_dump *fadump_conf,
struct seq_file *m);
void (*fadump_trigger)(struct fadump_crash_info_header *fdh,
const char *msg);
int (*fadump_max_boot_mem_rgns)(void);
};
/* Helper functions */
s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus);
void fadump_free_cpu_notes_buf(void);
u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
void __init fadump_update_elfcore_header(char *bufp);
bool is_fadump_reserved_mem_contiguous(void);
#else /* !CONFIG_PRESERVE_FA_DUMP */
/* Firmware-assisted dump configuration details. */
struct fw_dump {
u64 boot_mem_top;
u64 dump_active;
};
#endif /* CONFIG_PRESERVE_FA_DUMP */
#ifdef CONFIG_PPC_PSERIES
extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
#else
static inline void
rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
#endif
#ifdef CONFIG_PPC_POWERNV
extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
#else
static inline void
opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
#endif
#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
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