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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 /* Alignement per CMA requirement. */
 52 #define FADUMP_CMA_ALIGNMENT    (PAGE_SIZE <<                           \
 53                         max_t(unsigned long, MAX_ORDER - 1, pageblock_order))
 54 
 55 /* Firmware provided dump sections */
 56 #define FADUMP_CPU_STATE_DATA   0x0001
 57 #define FADUMP_HPTE_REGION      0x0002
 58 #define FADUMP_REAL_MODE_REGION 0x0011
 59 
 60 /* Dump request flag */
 61 #define FADUMP_REQUEST_FLAG     0x00000001
 62 
 63 /* FAD commands */
 64 #define FADUMP_REGISTER         1
 65 #define FADUMP_UNREGISTER       2
 66 #define FADUMP_INVALIDATE       3
 67 
 68 /* Dump status flag */
 69 #define FADUMP_ERROR_FLAG       0x2000
 70 
 71 #define FADUMP_CPU_ID_MASK      ((1UL << 32) - 1)
 72 
 73 #define CPU_UNKNOWN             (~((u32)0))
 74 
 75 /* Utility macros */
 76 #define SKIP_TO_NEXT_CPU(reg_entry)                                     \
 77 ({                                                                      \
 78         while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND"))      \
 79                 reg_entry++;                                            \
 80         reg_entry++;                                                    \
 81 })
 82 
 83 extern int crashing_cpu;
 84 
 85 /* Kernel Dump section info */
 86 struct fadump_section {
 87         __be32  request_flag;
 88         __be16  source_data_type;
 89         __be16  error_flags;
 90         __be64  source_address;
 91         __be64  source_len;
 92         __be64  bytes_dumped;
 93         __be64  destination_address;
 94 };
 95 
 96 /* ibm,configure-kernel-dump header. */
 97 struct fadump_section_header {
 98         __be32  dump_format_version;
 99         __be16  dump_num_sections;
100         __be16  dump_status_flag;
101         __be32  offset_first_dump_section;
102 
103         /* Fields for disk dump option. */
104         __be32  dd_block_size;
105         __be64  dd_block_offset;
106         __be64  dd_num_blocks;
107         __be32  dd_offset_disk_path;
108 
109         /* Maximum time allowed to prevent an automatic dump-reboot. */
110         __be32  max_time_auto;
111 };
112 
113 /*
114  * Firmware Assisted dump memory structure. This structure is required for
115  * registering future kernel dump with power firmware through rtas call.
116  *
117  * No disk dump option. Hence disk dump path string section is not included.
118  */
119 struct fadump_mem_struct {
120         struct fadump_section_header    header;
121 
122         /* Kernel dump sections */
123         struct fadump_section           cpu_state_data;
124         struct fadump_section           hpte_region;
125         struct fadump_section           rmr_region;
126 };
127 
128 /* Firmware-assisted dump configuration details. */
129 struct fw_dump {
130         unsigned long   cpu_state_data_size;
131         unsigned long   hpte_region_size;
132         unsigned long   boot_memory_size;
133         unsigned long   reserve_dump_area_start;
134         unsigned long   reserve_dump_area_size;
135         /* cmd line option during boot */
136         unsigned long   reserve_bootvar;
137 
138         unsigned long   fadumphdr_addr;
139         unsigned long   cpu_notes_buf;
140         unsigned long   cpu_notes_buf_size;
141 
142         int             ibm_configure_kernel_dump;
143 
144         unsigned long   fadump_enabled:1;
145         unsigned long   fadump_supported:1;
146         unsigned long   dump_active:1;
147         unsigned long   dump_registered:1;
148         unsigned long   nocma:1;
149 };
150 
151 /*
152  * Copy the ascii values for first 8 characters from a string into u64
153  * variable at their respective indexes.
154  * e.g.
155  *  The string "FADMPINF" will be converted into 0x4641444d50494e46
156  */
157 static inline u64 str_to_u64(const char *str)
158 {
159         u64 val = 0;
160         int i;
161 
162         for (i = 0; i < sizeof(val); i++)
163                 val = (*str) ? (val << 8) | *str++ : val << 8;
164         return val;
165 }
166 #define STR_TO_HEX(x)   str_to_u64(x)
167 #define REG_ID(x)       str_to_u64(x)
168 
169 #define FADUMP_CRASH_INFO_MAGIC         STR_TO_HEX("FADMPINF")
170 #define REGSAVE_AREA_MAGIC              STR_TO_HEX("REGSAVE")
171 
172 /* The firmware-assisted dump format.
173  *
174  * The register save area is an area in the partition's memory used to preserve
175  * the register contents (CPU state data) for the active CPUs during a firmware
176  * assisted dump. The dump format contains register save area header followed
177  * by register entries. Each list of registers for a CPU starts with
178  * "CPUSTRT" and ends with "CPUEND".
179  */
180 
181 /* Register save area header. */
182 struct fadump_reg_save_area_header {
183         __be64          magic_number;
184         __be32          version;
185         __be32          num_cpu_offset;
186 };
187 
188 /* Register entry. */
189 struct fadump_reg_entry {
190         __be64          reg_id;
191         __be64          reg_value;
192 };
193 
194 /* fadump crash info structure */
195 struct fadump_crash_info_header {
196         u64             magic_number;
197         u64             elfcorehdr_addr;
198         u32             crashing_cpu;
199         struct pt_regs  regs;
200         struct cpumask  online_mask;
201 };
202 
203 struct fad_crash_memory_ranges {
204         unsigned long long      base;
205         unsigned long long      size;
206 };
207 
208 extern int is_fadump_memory_area(u64 addr, ulong size);
209 extern int early_init_dt_scan_fw_dump(unsigned long node,
210                 const char *uname, int depth, void *data);
211 extern int fadump_reserve_mem(void);
212 extern int setup_fadump(void);
213 extern int is_fadump_active(void);
214 extern int should_fadump_crash(void);
215 extern void crash_fadump(struct pt_regs *, const char *);
216 extern void fadump_cleanup(void);
217 
218 #else   /* CONFIG_FA_DUMP */
219 static inline int is_fadump_active(void) { return 0; }
220 static inline int should_fadump_crash(void) { return 0; }
221 static inline void crash_fadump(struct pt_regs *regs, const char *str) { }
222 #endif
223 #endif
224 

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