arch/powerpc/include/asm/fadump-internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Firmware-Assisted Dump internal code.
   4  *
   5  * Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
   6  * Copyright 2019, Hari Bathini, IBM Corporation.
   7  */
   8
   9 #ifndef _ASM_POWERPC_FADUMP_INTERNAL_H
  10 #define _ASM_POWERPC_FADUMP_INTERNAL_H
  11
  12 /* Maximum number of memory regions kernel supports */
  13 #define FADUMP_MAX_MEM_REGS                     128
  14
  15 #ifndef CONFIG_PRESERVE_FA_DUMP
  16
  17 /* The upper limit percentage for user specified boot memory size (25%) */
  18 #define MAX_BOOT_MEM_RATIO                      4
  19
  20 #define memblock_num_regions(memblock_type)     (memblock.memblock_type.cnt)
  21
  22 /* Alignment per CMA requirement. */
  23 #define FADUMP_CMA_ALIGNMENT    (PAGE_SIZE <<                           \
  24                                  max_t(unsigned long, MAX_ORDER - 1,    \
  25                                  pageblock_order))
  26
  27 /* FAD commands */
  28 #define FADUMP_REGISTER                 1
  29 #define FADUMP_UNREGISTER               2
  30 #define FADUMP_INVALIDATE               3
  31
  32 /*
  33  * Copy the ascii values for first 8 characters from a string into u64
  34  * variable at their respective indexes.
  35  * e.g.
  36  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
  37  */
  38 static inline u64 fadump_str_to_u64(const char *str)
  39 {
  40         u64 val = 0;
  41         int i;
  42
  43         for (i = 0; i < sizeof(val); i++)
  44                 val = (*str) ? (val << 8) | *str++ : val << 8;
  45         return val;
  46 }
  47
  48 #define FADUMP_CPU_UNKNOWN              (~((u32)0))
  49
  50 #define FADUMP_CRASH_INFO_MAGIC         fadump_str_to_u64("FADMPINF")
  51
  52 /* fadump crash info structure */
  53 struct fadump_crash_info_header {
  54         u64             magic_number;
  55         u64             elfcorehdr_addr;
  56         u32             crashing_cpu;
  57         struct pt_regs  regs;
  58         struct cpumask  online_mask;
  59 };
  60
  61 struct fadump_memory_range {
  62         u64     base;
  63         u64     size;
  64 };
  65
  66 /* fadump memory ranges info */
  67 #define RNG_NAME_SZ                     16
  68 struct fadump_mrange_info {
  69         char                            name[RNG_NAME_SZ];
  70         struct fadump_memory_range      *mem_ranges;
  71         u32                             mem_ranges_sz;
  72         u32                             mem_range_cnt;
  73         u32                             max_mem_ranges;
  74         bool                            is_static;
  75 };
  76
  77 /* Platform specific callback functions */
  78 struct fadump_ops;
  79
  80 /* Firmware-assisted dump configuration details. */
  81 struct fw_dump {
  82         unsigned long   reserve_dump_area_start;
  83         unsigned long   reserve_dump_area_size;
  84         /* cmd line option during boot */
  85         unsigned long   reserve_bootvar;
  86
  87         unsigned long   cpu_state_data_size;
  88         u64             cpu_state_dest_vaddr;
  89         u32             cpu_state_data_version;
  90         u32             cpu_state_entry_size;
  91
  92         unsigned long   hpte_region_size;
  93
  94         unsigned long   boot_memory_size;
  95         u64             boot_mem_dest_addr;
  96         u64             boot_mem_addr[FADUMP_MAX_MEM_REGS];
  97         u64             boot_mem_sz[FADUMP_MAX_MEM_REGS];
  98         u64             boot_mem_top;
  99         u64             boot_mem_regs_cnt;
 100
 101         unsigned long   fadumphdr_addr;
 102         unsigned long   cpu_notes_buf_vaddr;
 103         unsigned long   cpu_notes_buf_size;
 104
 105         /*
 106          * Maximum size supported by firmware to copy from source to
 107          * destination address per entry.
 108          */
 109         u64             max_copy_size;
 110         u64             kernel_metadata;
 111
 112         int             ibm_configure_kernel_dump;
 113
 114         unsigned long   fadump_enabled:1;
 115         unsigned long   fadump_supported:1;
 116         unsigned long   dump_active:1;
 117         unsigned long   dump_registered:1;
 118         unsigned long   nocma:1;
 119
 120         struct fadump_ops       *ops;
 121 };
 122
 123 struct fadump_ops {
 124         u64     (*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
 125         u64     (*fadump_get_metadata_size)(void);
 126         int     (*fadump_setup_metadata)(struct fw_dump *fadump_conf);
 127         u64     (*fadump_get_bootmem_min)(void);
 128         int     (*fadump_register)(struct fw_dump *fadump_conf);
 129         int     (*fadump_unregister)(struct fw_dump *fadump_conf);
 130         int     (*fadump_invalidate)(struct fw_dump *fadump_conf);
 131         void    (*fadump_cleanup)(struct fw_dump *fadump_conf);
 132         int     (*fadump_process)(struct fw_dump *fadump_conf);
 133         void    (*fadump_region_show)(struct fw_dump *fadump_conf,
 134                                       struct seq_file *m);
 135         void    (*fadump_trigger)(struct fadump_crash_info_header *fdh,
 136                                   const char *msg);
 137 };
 138
 139 /* Helper functions */
 140 s32 fadump_setup_cpu_notes_buf(u32 num_cpus);
 141 void fadump_free_cpu_notes_buf(void);
 142 u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
 143 void fadump_update_elfcore_header(char *bufp);
 144 bool is_fadump_boot_mem_contiguous(void);
 145 bool is_fadump_reserved_mem_contiguous(void);
 146
 147 #else /* !CONFIG_PRESERVE_FA_DUMP */
 148
 149 /* Firmware-assisted dump configuration details. */
 150 struct fw_dump {
 151         u64     boot_mem_top;
 152         u64     dump_active;
 153 };
 154
 155 #endif /* CONFIG_PRESERVE_FA_DUMP */
 156
 157 #ifdef CONFIG_PPC_PSERIES
 158 extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
 159 #else
 160 static inline void
 161 rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
 162 #endif
 163
 164 #ifdef CONFIG_PPC_POWERNV
 165 extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
 166 #else
 167 static inline void
 168 opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
 169 #endif
 170
 171 #endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */