212 lines
5.6 KiB
C
212 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Firmware Assisted dump header file.
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*
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* Copyright 2011 IBM Corporation
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* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
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*/
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#ifndef __PPC64_FA_DUMP_H__
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#define __PPC64_FA_DUMP_H__
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#ifdef CONFIG_FA_DUMP
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/*
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* The RMA region will be saved for later dumping when kernel crashes.
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* RMA is Real Mode Area, the first block of logical memory address owned
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* by logical partition, containing the storage that may be accessed with
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* translate off.
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*/
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#define RMA_START 0x0
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#define RMA_END (ppc64_rma_size)
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/*
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* On some Power systems where RMO is 128MB, it still requires minimum of
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* 256MB for kernel to boot successfully. When kdump infrastructure is
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* configured to save vmcore over network, we run into OOM issue while
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* loading modules related to network setup. Hence we need aditional 64M
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* of memory to avoid OOM issue.
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*/
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#define MIN_BOOT_MEM (((RMA_END < (0x1UL << 28)) ? (0x1UL << 28) : RMA_END) \
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+ (0x1UL << 26))
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/* The upper limit percentage for user specified boot memory size (25%) */
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#define MAX_BOOT_MEM_RATIO 4
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#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
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/* Alignement per CMA requirement. */
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#define FADUMP_CMA_ALIGNMENT (PAGE_SIZE << \
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max_t(unsigned long, MAX_ORDER - 1, pageblock_order))
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/* Firmware provided dump sections */
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#define FADUMP_CPU_STATE_DATA 0x0001
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#define FADUMP_HPTE_REGION 0x0002
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#define FADUMP_REAL_MODE_REGION 0x0011
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/* Dump request flag */
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#define FADUMP_REQUEST_FLAG 0x00000001
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/* FAD commands */
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#define FADUMP_REGISTER 1
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#define FADUMP_UNREGISTER 2
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#define FADUMP_INVALIDATE 3
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/* Dump status flag */
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#define FADUMP_ERROR_FLAG 0x2000
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#define FADUMP_CPU_ID_MASK ((1UL << 32) - 1)
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#define CPU_UNKNOWN (~((u32)0))
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/* Utility macros */
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#define SKIP_TO_NEXT_CPU(reg_entry) \
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({ \
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while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND")) \
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reg_entry++; \
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reg_entry++; \
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})
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extern int crashing_cpu;
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/* Kernel Dump section info */
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struct fadump_section {
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__be32 request_flag;
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__be16 source_data_type;
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__be16 error_flags;
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__be64 source_address;
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__be64 source_len;
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__be64 bytes_dumped;
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__be64 destination_address;
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};
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/* ibm,configure-kernel-dump header. */
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struct fadump_section_header {
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__be32 dump_format_version;
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__be16 dump_num_sections;
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__be16 dump_status_flag;
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__be32 offset_first_dump_section;
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/* Fields for disk dump option. */
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__be32 dd_block_size;
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__be64 dd_block_offset;
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__be64 dd_num_blocks;
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__be32 dd_offset_disk_path;
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/* Maximum time allowed to prevent an automatic dump-reboot. */
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__be32 max_time_auto;
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};
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/*
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* Firmware Assisted dump memory structure. This structure is required for
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* registering future kernel dump with power firmware through rtas call.
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*
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* No disk dump option. Hence disk dump path string section is not included.
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*/
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struct fadump_mem_struct {
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struct fadump_section_header header;
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/* Kernel dump sections */
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struct fadump_section cpu_state_data;
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struct fadump_section hpte_region;
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struct fadump_section rmr_region;
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};
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/* Firmware-assisted dump configuration details. */
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struct fw_dump {
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unsigned long cpu_state_data_size;
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unsigned long hpte_region_size;
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unsigned long boot_memory_size;
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unsigned long reserve_dump_area_start;
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unsigned long reserve_dump_area_size;
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/* cmd line option during boot */
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unsigned long reserve_bootvar;
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unsigned long fadumphdr_addr;
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unsigned long cpu_notes_buf;
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unsigned long cpu_notes_buf_size;
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int ibm_configure_kernel_dump;
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unsigned long fadump_enabled:1;
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unsigned long fadump_supported:1;
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unsigned long dump_active:1;
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unsigned long dump_registered:1;
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unsigned long nocma:1;
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};
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/*
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* Copy the ascii values for first 8 characters from a string into u64
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* variable at their respective indexes.
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* e.g.
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* The string "FADMPINF" will be converted into 0x4641444d50494e46
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*/
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static inline u64 str_to_u64(const char *str)
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{
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u64 val = 0;
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int i;
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for (i = 0; i < sizeof(val); i++)
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val = (*str) ? (val << 8) | *str++ : val << 8;
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return val;
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}
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#define STR_TO_HEX(x) str_to_u64(x)
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#define REG_ID(x) str_to_u64(x)
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#define FADUMP_CRASH_INFO_MAGIC STR_TO_HEX("FADMPINF")
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#define REGSAVE_AREA_MAGIC STR_TO_HEX("REGSAVE")
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/* The firmware-assisted dump format.
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*
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* The register save area is an area in the partition's memory used to preserve
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* the register contents (CPU state data) for the active CPUs during a firmware
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* assisted dump. The dump format contains register save area header followed
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* by register entries. Each list of registers for a CPU starts with
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* "CPUSTRT" and ends with "CPUEND".
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*/
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/* Register save area header. */
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struct fadump_reg_save_area_header {
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__be64 magic_number;
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__be32 version;
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__be32 num_cpu_offset;
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};
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/* Register entry. */
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struct fadump_reg_entry {
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__be64 reg_id;
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__be64 reg_value;
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};
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/* fadump crash info structure */
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struct fadump_crash_info_header {
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u64 magic_number;
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u64 elfcorehdr_addr;
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u32 crashing_cpu;
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struct pt_regs regs;
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struct cpumask online_mask;
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};
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struct fad_crash_memory_ranges {
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unsigned long long base;
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unsigned long long size;
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};
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extern int is_fadump_memory_area(u64 addr, ulong size);
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extern int early_init_dt_scan_fw_dump(unsigned long node,
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const char *uname, int depth, void *data);
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extern int fadump_reserve_mem(void);
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extern int setup_fadump(void);
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extern int is_fadump_active(void);
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extern int should_fadump_crash(void);
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extern void crash_fadump(struct pt_regs *, const char *);
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extern void fadump_cleanup(void);
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#else /* CONFIG_FA_DUMP */
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static inline int is_fadump_active(void) { return 0; }
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static inline int should_fadump_crash(void) { return 0; }
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static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
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static inline void fadump_cleanup(void) { }
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#endif
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#endif
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