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TOMOYO Linux Cross Reference
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 /* The upper limit percentage for user specified boot memory size (25%) */
 47 #define MAX_BOOT_MEM_RATIO                      4
 48 
 49 #define memblock_num_regions(memblock_type)     (memblock.memblock_type.cnt)
 50 
 51 /* Firmware provided dump sections */
 52 #define FADUMP_CPU_STATE_DATA   0x0001
 53 #define FADUMP_HPTE_REGION      0x0002
 54 #define FADUMP_REAL_MODE_REGION 0x0011
 55 
 56 /* Dump request flag */
 57 #define FADUMP_REQUEST_FLAG     0x00000001
 58 
 59 /* FAD commands */
 60 #define FADUMP_REGISTER         1
 61 #define FADUMP_UNREGISTER       2
 62 #define FADUMP_INVALIDATE       3
 63 
 64 /* Dump status flag */
 65 #define FADUMP_ERROR_FLAG       0x2000
 66 
 67 #define FADUMP_CPU_ID_MASK      ((1UL << 32) - 1)
 68 
 69 #define CPU_UNKNOWN             (~((u32)0))
 70 
 71 /* Utility macros */
 72 #define SKIP_TO_NEXT_CPU(reg_entry)                                     \
 73 ({                                                                      \
 74         while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND"))      \
 75                 reg_entry++;                                            \
 76         reg_entry++;                                                    \
 77 })
 78 
 79 extern int crashing_cpu;
 80 
 81 /* Kernel Dump section info */
 82 struct fadump_section {
 83         __be32  request_flag;
 84         __be16  source_data_type;
 85         __be16  error_flags;
 86         __be64  source_address;
 87         __be64  source_len;
 88         __be64  bytes_dumped;
 89         __be64  destination_address;
 90 };
 91 
 92 /* ibm,configure-kernel-dump header. */
 93 struct fadump_section_header {
 94         __be32  dump_format_version;
 95         __be16  dump_num_sections;
 96         __be16  dump_status_flag;
 97         __be32  offset_first_dump_section;
 98 
 99         /* Fields for disk dump option. */
100         __be32  dd_block_size;
101         __be64  dd_block_offset;
102         __be64  dd_num_blocks;
103         __be32  dd_offset_disk_path;
104 
105         /* Maximum time allowed to prevent an automatic dump-reboot. */
106         __be32  max_time_auto;
107 };
108 
109 /*
110  * Firmware Assisted dump memory structure. This structure is required for
111  * registering future kernel dump with power firmware through rtas call.
112  *
113  * No disk dump option. Hence disk dump path string section is not included.
114  */
115 struct fadump_mem_struct {
116         struct fadump_section_header    header;
117 
118         /* Kernel dump sections */
119         struct fadump_section           cpu_state_data;
120         struct fadump_section           hpte_region;
121         struct fadump_section           rmr_region;
122 };
123 
124 /* Firmware-assisted dump configuration details. */
125 struct fw_dump {
126         unsigned long   cpu_state_data_size;
127         unsigned long   hpte_region_size;
128         unsigned long   boot_memory_size;
129         unsigned long   reserve_dump_area_start;
130         unsigned long   reserve_dump_area_size;
131         /* cmd line option during boot */
132         unsigned long   reserve_bootvar;
133 
134         unsigned long   fadumphdr_addr;
135         unsigned long   cpu_notes_buf;
136         unsigned long   cpu_notes_buf_size;
137 
138         int             ibm_configure_kernel_dump;
139 
140         unsigned long   fadump_enabled:1;
141         unsigned long   fadump_supported:1;
142         unsigned long   dump_active:1;
143         unsigned long   dump_registered:1;
144 };
145 
146 /*
147  * Copy the ascii values for first 8 characters from a string into u64
148  * variable at their respective indexes.
149  * e.g.
150  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
151  */
152 static inline u64 str_to_u64(const char *str)
153 {
154         u64 val = 0;
155         int i;
156 
157         for (i = 0; i < sizeof(val); i++)
158                 val = (*str) ? (val << 8) | *str++ : val << 8;
159         return val;
160 }
161 #define STR_TO_HEX(x)   str_to_u64(x)
162 #define REG_ID(x)       str_to_u64(x)
163 
164 #define FADUMP_CRASH_INFO_MAGIC         STR_TO_HEX("FADMPINF")
165 #define REGSAVE_AREA_MAGIC              STR_TO_HEX("REGSAVE")
166 
167 /* The firmware-assisted dump format.
168  *
169  * The register save area is an area in the partition's memory used to preserve
170  * the register contents (CPU state data) for the active CPUs during a firmware
171  * assisted dump. The dump format contains register save area header followed
172  * by register entries. Each list of registers for a CPU starts with
173  * "CPUSTRT" and ends with "CPUEND".
174  */
175 
176 /* Register save area header. */
177 struct fadump_reg_save_area_header {
178         __be64          magic_number;
179         __be32          version;
180         __be32          num_cpu_offset;
181 };
182 
183 /* Register entry. */
184 struct fadump_reg_entry {
185         __be64          reg_id;
186         __be64          reg_value;
187 };
188 
189 /* fadump crash info structure */
190 struct fadump_crash_info_header {
191         u64             magic_number;
192         u64             elfcorehdr_addr;
193         u32             crashing_cpu;
194         struct pt_regs  regs;
195         struct cpumask  online_mask;
196 };
197 
198 struct fad_crash_memory_ranges {
199         unsigned long long      base;
200         unsigned long long      size;
201 };
202 
203 extern int is_fadump_memory_area(u64 addr, ulong size);
204 extern int early_init_dt_scan_fw_dump(unsigned long node,
205                 const char *uname, int depth, void *data);
206 extern int fadump_reserve_mem(void);
207 extern int setup_fadump(void);
208 extern int is_fadump_active(void);
209 extern int should_fadump_crash(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 int should_fadump_crash(void) { return 0; }
216 static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
217 #endif
218 #endif
219 

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