arch/powerpc/include/asm/fadump.h

   1 /*
   2  * Firmware Assisted dump header file.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright 2011 IBM Corporation
  19  * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
  20  */
  21
  22 #ifndef __PPC64_FA_DUMP_H__
  23 #define __PPC64_FA_DUMP_H__
  24
  25 #ifdef CONFIG_FA_DUMP
  26
  27 /*
  28  * The RMA region will be saved for later dumping when kernel crashes.
  29  * RMA is Real Mode Area, the first block of logical memory address owned
  30  * by logical partition, containing the storage that may be accessed with
  31  * translate off.
  32  */
  33 #define RMA_START       0x0
  34 #define RMA_END         (ppc64_rma_size)
  35
  36 /*
  37  * On some Power systems where RMO is 128MB, it still requires minimum of
  38  * 256MB for kernel to boot successfully. When kdump infrastructure is
  39  * configured to save vmcore over network, we run into OOM issue while
  40  * loading modules related to network setup. Hence we need aditional 64M
  41  * of memory to avoid OOM issue.
  42  */
  43 #define MIN_BOOT_MEM    (((RMA_END < (0x1UL << 28)) ? (0x1UL << 28) : RMA_END) \
  44                         + (0x1UL << 26))
  45
  46 #define memblock_num_regions(memblock_type)     (memblock.memblock_type.cnt)
  47
  48 #ifndef ELF_CORE_EFLAGS
  49 #define ELF_CORE_EFLAGS 0
  50 #endif
  51
  52 /* Firmware provided dump sections */
  53 #define FADUMP_CPU_STATE_DATA   0x0001
  54 #define FADUMP_HPTE_REGION      0x0002
  55 #define FADUMP_REAL_MODE_REGION 0x0011
  56
  57 /* Dump request flag */
  58 #define FADUMP_REQUEST_FLAG     0x00000001
  59
  60 /* FAD commands */
  61 #define FADUMP_REGISTER         1
  62 #define FADUMP_UNREGISTER       2
  63 #define FADUMP_INVALIDATE       3
  64
  65 /* Dump status flag */
  66 #define FADUMP_ERROR_FLAG       0x2000
  67
  68 #define FADUMP_CPU_ID_MASK      ((1UL << 32) - 1)
  69
  70 #define CPU_UNKNOWN             (~((u32)0))
  71
  72 /* Utility macros */
  73 #define SKIP_TO_NEXT_CPU(reg_entry)                                     \
  74 ({                                                                      \
  75         while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND"))      \
  76                 reg_entry++;                                            \
  77         reg_entry++;                                                    \
  78 })
  79
  80 /* Kernel Dump section info */
  81 struct fadump_section {
  82         __be32  request_flag;
  83         __be16  source_data_type;
  84         __be16  error_flags;
  85         __be64  source_address;
  86         __be64  source_len;
  87         __be64  bytes_dumped;
  88         __be64  destination_address;
  89 };
  90
  91 /* ibm,configure-kernel-dump header. */
  92 struct fadump_section_header {
  93         __be32  dump_format_version;
  94         __be16  dump_num_sections;
  95         __be16  dump_status_flag;
  96         __be32  offset_first_dump_section;
  97
  98         /* Fields for disk dump option. */
  99         __be32  dd_block_size;
 100         __be64  dd_block_offset;
 101         __be64  dd_num_blocks;
 102         __be32  dd_offset_disk_path;
 103
 104         /* Maximum time allowed to prevent an automatic dump-reboot. */
 105         __be32  max_time_auto;
 106 };
 107
 108 /*
 109  * Firmware Assisted dump memory structure. This structure is required for
 110  * registering future kernel dump with power firmware through rtas call.
 111  *
 112  * No disk dump option. Hence disk dump path string section is not included.
 113  */
 114 struct fadump_mem_struct {
 115         struct fadump_section_header    header;
 116
 117         /* Kernel dump sections */
 118         struct fadump_section           cpu_state_data;
 119         struct fadump_section           hpte_region;
 120         struct fadump_section           rmr_region;
 121 };
 122
 123 /* Firmware-assisted dump configuration details. */
 124 struct fw_dump {
 125         unsigned long   cpu_state_data_size;
 126         unsigned long   hpte_region_size;
 127         unsigned long   boot_memory_size;
 128         unsigned long   reserve_dump_area_start;
 129         unsigned long   reserve_dump_area_size;
 130         /* cmd line option during boot */
 131         unsigned long   reserve_bootvar;
 132
 133         unsigned long   fadumphdr_addr;
 134         unsigned long   cpu_notes_buf;
 135         unsigned long   cpu_notes_buf_size;
 136
 137         int             ibm_configure_kernel_dump;
 138
 139         unsigned long   fadump_enabled:1;
 140         unsigned long   fadump_supported:1;
 141         unsigned long   dump_active:1;
 142         unsigned long   dump_registered:1;
 143 };
 144
 145 /*
 146  * Copy the ascii values for first 8 characters from a string into u64
 147  * variable at their respective indexes.
 148  * e.g.
 149  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
 150  */
 151 static inline u64 str_to_u64(const char *str)
 152 {
 153         u64 val = 0;
 154         int i;
 155
 156         for (i = 0; i < sizeof(val); i++)
 157                 val = (*str) ? (val << 8) | *str++ : val << 8;
 158         return val;
 159 }
 160 #define STR_TO_HEX(x)   str_to_u64(x)
 161 #define REG_ID(x)       str_to_u64(x)
 162
 163 #define FADUMP_CRASH_INFO_MAGIC         STR_TO_HEX("FADMPINF")
 164 #define REGSAVE_AREA_MAGIC              STR_TO_HEX("REGSAVE")
 165
 166 /* The firmware-assisted dump format.
 167  *
 168  * The register save area is an area in the partition's memory used to preserve
 169  * the register contents (CPU state data) for the active CPUs during a firmware
 170  * assisted dump. The dump format contains register save area header followed
 171  * by register entries. Each list of registers for a CPU starts with
 172  * "CPUSTRT" and ends with "CPUEND".
 173  */
 174
 175 /* Register save area header. */
 176 struct fadump_reg_save_area_header {
 177         __be64          magic_number;
 178         __be32          version;
 179         __be32          num_cpu_offset;
 180 };
 181
 182 /* Register entry. */
 183 struct fadump_reg_entry {
 184         __be64          reg_id;
 185         __be64          reg_value;
 186 };
 187
 188 /* fadump crash info structure */
 189 struct fadump_crash_info_header {
 190         u64             magic_number;
 191         u64             elfcorehdr_addr;
 192         u32             crashing_cpu;
 193         struct pt_regs  regs;
 194         struct cpumask  online_mask;
 195 };
 196
 197 /* Crash memory ranges */
 198 #define INIT_CRASHMEM_RANGES    (INIT_MEMBLOCK_REGIONS + 2)
 199
 200 struct fad_crash_memory_ranges {
 201         unsigned long long      base;
 202         unsigned long long      size;
 203 };
 204
 205 extern int early_init_dt_scan_fw_dump(unsigned long node,
 206                 const char *uname, int depth, void *data);
 207 extern int fadump_reserve_mem(void);
 208 extern int setup_fadump(void);
 209 extern int is_fadump_active(void);
 210 extern void crash_fadump(struct pt_regs *, const char *);
 211 extern void fadump_cleanup(void);
 212
 213 #else   /* CONFIG_FA_DUMP */
 214 static inline int is_fadump_active(void) { return 0; }
 215 static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
 216 #endif
 217 #endif