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Linux/arch/powerpc/include/asm/fadump.h

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  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 /* Firmware provided dump sections */
 49 #define FADUMP_CPU_STATE_DATA   0x0001
 50 #define FADUMP_HPTE_REGION      0x0002
 51 #define FADUMP_REAL_MODE_REGION 0x0011
 52 
 53 /* Dump request flag */
 54 #define FADUMP_REQUEST_FLAG     0x00000001
 55 
 56 /* FAD commands */
 57 #define FADUMP_REGISTER         1
 58 #define FADUMP_UNREGISTER       2
 59 #define FADUMP_INVALIDATE       3
 60 
 61 /* Dump status flag */
 62 #define FADUMP_ERROR_FLAG       0x2000
 63 
 64 #define FADUMP_CPU_ID_MASK      ((1UL << 32) - 1)
 65 
 66 #define CPU_UNKNOWN             (~((u32)0))
 67 
 68 /* Utility macros */
 69 #define SKIP_TO_NEXT_CPU(reg_entry)                                     \
 70 ({                                                                      \
 71         while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND"))      \
 72                 reg_entry++;                                            \
 73         reg_entry++;                                                    \
 74 })
 75 
 76 extern int crashing_cpu;
 77 
 78 /* Kernel Dump section info */
 79 struct fadump_section {
 80         __be32  request_flag;
 81         __be16  source_data_type;
 82         __be16  error_flags;
 83         __be64  source_address;
 84         __be64  source_len;
 85         __be64  bytes_dumped;
 86         __be64  destination_address;
 87 };
 88 
 89 /* ibm,configure-kernel-dump header. */
 90 struct fadump_section_header {
 91         __be32  dump_format_version;
 92         __be16  dump_num_sections;
 93         __be16  dump_status_flag;
 94         __be32  offset_first_dump_section;
 95 
 96         /* Fields for disk dump option. */
 97         __be32  dd_block_size;
 98         __be64  dd_block_offset;
 99         __be64  dd_num_blocks;
100         __be32  dd_offset_disk_path;
101 
102         /* Maximum time allowed to prevent an automatic dump-reboot. */
103         __be32  max_time_auto;
104 };
105 
106 /*
107  * Firmware Assisted dump memory structure. This structure is required for
108  * registering future kernel dump with power firmware through rtas call.
109  *
110  * No disk dump option. Hence disk dump path string section is not included.
111  */
112 struct fadump_mem_struct {
113         struct fadump_section_header    header;
114 
115         /* Kernel dump sections */
116         struct fadump_section           cpu_state_data;
117         struct fadump_section           hpte_region;
118         struct fadump_section           rmr_region;
119 };
120 
121 /* Firmware-assisted dump configuration details. */
122 struct fw_dump {
123         unsigned long   cpu_state_data_size;
124         unsigned long   hpte_region_size;
125         unsigned long   boot_memory_size;
126         unsigned long   reserve_dump_area_start;
127         unsigned long   reserve_dump_area_size;
128         /* cmd line option during boot */
129         unsigned long   reserve_bootvar;
130 
131         unsigned long   fadumphdr_addr;
132         unsigned long   cpu_notes_buf;
133         unsigned long   cpu_notes_buf_size;
134 
135         int             ibm_configure_kernel_dump;
136 
137         unsigned long   fadump_enabled:1;
138         unsigned long   fadump_supported:1;
139         unsigned long   dump_active:1;
140         unsigned long   dump_registered:1;
141 };
142 
143 /*
144  * Copy the ascii values for first 8 characters from a string into u64
145  * variable at their respective indexes.
146  * e.g.
147  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
148  */
149 static inline u64 str_to_u64(const char *str)
150 {
151         u64 val = 0;
152         int i;
153 
154         for (i = 0; i < sizeof(val); i++)
155                 val = (*str) ? (val << 8) | *str++ : val << 8;
156         return val;
157 }
158 #define STR_TO_HEX(x)   str_to_u64(x)
159 #define REG_ID(x)       str_to_u64(x)
160 
161 #define FADUMP_CRASH_INFO_MAGIC         STR_TO_HEX("FADMPINF")
162 #define REGSAVE_AREA_MAGIC              STR_TO_HEX("REGSAVE")
163 
164 /* The firmware-assisted dump format.
165  *
166  * The register save area is an area in the partition's memory used to preserve
167  * the register contents (CPU state data) for the active CPUs during a firmware
168  * assisted dump. The dump format contains register save area header followed
169  * by register entries. Each list of registers for a CPU starts with
170  * "CPUSTRT" and ends with "CPUEND".
171  */
172 
173 /* Register save area header. */
174 struct fadump_reg_save_area_header {
175         __be64          magic_number;
176         __be32          version;
177         __be32          num_cpu_offset;
178 };
179 
180 /* Register entry. */
181 struct fadump_reg_entry {
182         __be64          reg_id;
183         __be64          reg_value;
184 };
185 
186 /* fadump crash info structure */
187 struct fadump_crash_info_header {
188         u64             magic_number;
189         u64             elfcorehdr_addr;
190         u32             crashing_cpu;
191         struct pt_regs  regs;
192         struct cpumask  online_mask;
193 };
194 
195 /* Crash memory ranges */
196 #define INIT_CRASHMEM_RANGES    (INIT_MEMBLOCK_REGIONS + 2)
197 
198 struct fad_crash_memory_ranges {
199         unsigned long long      base;
200         unsigned long long      size;
201 };
202 
203 extern int early_init_dt_scan_fw_dump(unsigned long node,
204                 const char *uname, int depth, void *data);
205 extern int fadump_reserve_mem(void);
206 extern int setup_fadump(void);
207 extern int is_fadump_active(void);
208 extern void crash_fadump(struct pt_regs *, const char *);
209 extern void fadump_cleanup(void);
210 
211 #else   /* CONFIG_FA_DUMP */
212 static inline int is_fadump_active(void) { return 0; }
213 static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
214 #endif
215 #endif
216 

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