arch/powerpc/platforms/pseries/rtas-fadump.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Firmware-Assisted Dump support on POWERVM platform.
   4  *
   5  * Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
   6  * Copyright 2019, Hari Bathini, IBM Corporation.
   7  */
   8
   9 #ifndef _PSERIES_RTAS_FADUMP_H
  10 #define _PSERIES_RTAS_FADUMP_H
  11
  12 /*
  13  * On some Power systems where RMO is 128MB, it still requires minimum of
  14  * 256MB for kernel to boot successfully. When kdump infrastructure is
  15  * configured to save vmcore over network, we run into OOM issue while
  16  * loading modules related to network setup. Hence we need additional 64M
  17  * of memory to avoid OOM issue.
  18  */
  19 #define RTAS_FADUMP_MIN_BOOT_MEM        ((0x1UL << 28) + (0x1UL << 26))
  20
  21 /* Firmware provided dump sections */
  22 #define RTAS_FADUMP_CPU_STATE_DATA      0x0001
  23 #define RTAS_FADUMP_HPTE_REGION         0x0002
  24 #define RTAS_FADUMP_REAL_MODE_REGION    0x0011
  25
  26 /* Dump request flag */
  27 #define RTAS_FADUMP_REQUEST_FLAG        0x00000001
  28
  29 /* Dump status flag */
  30 #define RTAS_FADUMP_ERROR_FLAG          0x2000
  31
  32 /* Kernel Dump section info */
  33 struct rtas_fadump_section {
  34         __be32  request_flag;
  35         __be16  source_data_type;
  36         __be16  error_flags;
  37         __be64  source_address;
  38         __be64  source_len;
  39         __be64  bytes_dumped;
  40         __be64  destination_address;
  41 };
  42
  43 /* ibm,configure-kernel-dump header. */
  44 struct rtas_fadump_section_header {
  45         __be32  dump_format_version;
  46         __be16  dump_num_sections;
  47         __be16  dump_status_flag;
  48         __be32  offset_first_dump_section;
  49
  50         /* Fields for disk dump option. */
  51         __be32  dd_block_size;
  52         __be64  dd_block_offset;
  53         __be64  dd_num_blocks;
  54         __be32  dd_offset_disk_path;
  55
  56         /* Maximum time allowed to prevent an automatic dump-reboot. */
  57         __be32  max_time_auto;
  58 };
  59
  60 /*
  61  * Firmware Assisted dump memory structure. This structure is required for
  62  * registering future kernel dump with power firmware through rtas call.
  63  *
  64  * No disk dump option. Hence disk dump path string section is not included.
  65  */
  66 struct rtas_fadump_mem_struct {
  67         struct rtas_fadump_section_header       header;
  68
  69         /* Kernel dump sections */
  70         struct rtas_fadump_section              cpu_state_data;
  71         struct rtas_fadump_section              hpte_region;
  72
  73         /*
  74          * TODO: Extend multiple boot memory regions support in the kernel
  75          *       for this platform.
  76          */
  77         struct rtas_fadump_section              rmr_region;
  78 };
  79
  80 /*
  81  * The firmware-assisted dump format.
  82  *
  83  * The register save area is an area in the partition's memory used to preserve
  84  * the register contents (CPU state data) for the active CPUs during a firmware
  85  * assisted dump. The dump format contains register save area header followed
  86  * by register entries. Each list of registers for a CPU starts with "CPUSTRT"
  87  * and ends with "CPUEND".
  88  */
  89
  90 /* Register save area header. */
  91 struct rtas_fadump_reg_save_area_header {
  92         __be64          magic_number;
  93         __be32          version;
  94         __be32          num_cpu_offset;
  95 };
  96
  97 /* Register entry. */
  98 struct rtas_fadump_reg_entry {
  99         __be64          reg_id;
 100         __be64          reg_value;
 101 };
 102
 103 /* Utility macros */
 104 #define RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry)                         \
 105 ({                                                                      \
 106         while (be64_to_cpu(reg_entry->reg_id) !=                        \
 107                fadump_str_to_u64("CPUEND"))                             \
 108                 reg_entry++;                                            \
 109         reg_entry++;                                                    \
 110 })
 111
 112 #define RTAS_FADUMP_CPU_ID_MASK                 ((1UL << 32) - 1)
 113
 114 #endif /* _PSERIES_RTAS_FADUMP_H */