Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Debug Store support |
| 3 | * |
| 4 | * This provides a low-level interface to the hardware's Debug Store |
| 5 | * feature that is used for last branch recording (LBR) and |
| 6 | * precise-event based sampling (PEBS). |
| 7 | * |
| 8 | * Different architectures use a different DS layout/pointer size. |
| 9 | * The below functions therefore work on a void*. |
| 10 | * |
| 11 | * |
| 12 | * Since there is no user for PEBS, yet, only LBR (or branch |
| 13 | * trace store, BTS) is supported. |
| 14 | * |
| 15 | * |
| 16 | * Copyright (C) 2007 Intel Corporation. |
| 17 | * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 |
| 18 | */ |
| 19 | |
| 20 | #include <asm/ds.h> |
| 21 | |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * Debug Store (DS) save area configuration (see Intel64 and IA32 |
| 29 | * Architectures Software Developer's Manual, section 18.5) |
| 30 | * |
| 31 | * The DS configuration consists of the following fields; different |
| 32 | * architetures vary in the size of those fields. |
| 33 | * - double-word aligned base linear address of the BTS buffer |
| 34 | * - write pointer into the BTS buffer |
| 35 | * - end linear address of the BTS buffer (one byte beyond the end of |
| 36 | * the buffer) |
| 37 | * - interrupt pointer into BTS buffer |
| 38 | * (interrupt occurs when write pointer passes interrupt pointer) |
| 39 | * - double-word aligned base linear address of the PEBS buffer |
| 40 | * - write pointer into the PEBS buffer |
| 41 | * - end linear address of the PEBS buffer (one byte beyond the end of |
| 42 | * the buffer) |
| 43 | * - interrupt pointer into PEBS buffer |
| 44 | * (interrupt occurs when write pointer passes interrupt pointer) |
| 45 | * - value to which counter is reset following counter overflow |
| 46 | * |
| 47 | * On later architectures, the last branch recording hardware uses |
| 48 | * 64bit pointers even in 32bit mode. |
| 49 | * |
| 50 | * |
| 51 | * Branch Trace Store (BTS) records store information about control |
| 52 | * flow changes. They at least provide the following information: |
| 53 | * - source linear address |
| 54 | * - destination linear address |
| 55 | * |
| 56 | * Netburst supported a predicated bit that had been dropped in later |
| 57 | * architectures. We do not suppor it. |
| 58 | * |
| 59 | * |
| 60 | * In order to abstract from the actual DS and BTS layout, we describe |
| 61 | * the access to the relevant fields. |
| 62 | * Thanks to Andi Kleen for proposing this design. |
| 63 | * |
| 64 | * The implementation, however, is not as general as it might seem. In |
| 65 | * order to stay somewhat simple and efficient, we assume an |
| 66 | * underlying unsigned type (mostly a pointer type) and we expect the |
| 67 | * field to be at least as big as that type. |
| 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * A special from_ip address to indicate that the BTS record is an |
| 72 | * info record that needs to be interpreted or skipped. |
| 73 | */ |
| 74 | #define BTS_ESCAPE_ADDRESS (-1) |
| 75 | |
| 76 | /* |
| 77 | * A field access descriptor |
| 78 | */ |
| 79 | struct access_desc { |
| 80 | unsigned char offset; |
| 81 | unsigned char size; |
| 82 | }; |
| 83 | |
| 84 | /* |
| 85 | * The configuration for a particular DS/BTS hardware implementation. |
| 86 | */ |
| 87 | struct ds_configuration { |
| 88 | /* the DS configuration */ |
| 89 | unsigned char sizeof_ds; |
| 90 | struct access_desc bts_buffer_base; |
| 91 | struct access_desc bts_index; |
| 92 | struct access_desc bts_absolute_maximum; |
| 93 | struct access_desc bts_interrupt_threshold; |
| 94 | /* the BTS configuration */ |
| 95 | unsigned char sizeof_bts; |
| 96 | struct access_desc from_ip; |
| 97 | struct access_desc to_ip; |
| 98 | /* BTS variants used to store additional information like |
| 99 | timestamps */ |
| 100 | struct access_desc info_type; |
| 101 | struct access_desc info_data; |
| 102 | unsigned long debugctl_mask; |
| 103 | }; |
| 104 | |
| 105 | /* |
| 106 | * The global configuration used by the below accessor functions |
| 107 | */ |
| 108 | static struct ds_configuration ds_cfg; |
| 109 | |
| 110 | /* |
| 111 | * Accessor functions for some DS and BTS fields using the above |
| 112 | * global ptrace_bts_cfg. |
| 113 | */ |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 114 | static inline unsigned long get_bts_buffer_base(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 115 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 116 | return *(unsigned long *)(base + ds_cfg.bts_buffer_base.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 117 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 118 | static inline void set_bts_buffer_base(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 119 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 120 | (*(unsigned long *)(base + ds_cfg.bts_buffer_base.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 121 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 122 | static inline unsigned long get_bts_index(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 123 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 124 | return *(unsigned long *)(base + ds_cfg.bts_index.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 125 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 126 | static inline void set_bts_index(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 127 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 128 | (*(unsigned long *)(base + ds_cfg.bts_index.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 129 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 130 | static inline unsigned long get_bts_absolute_maximum(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 131 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 132 | return *(unsigned long *)(base + ds_cfg.bts_absolute_maximum.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 133 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 134 | static inline void set_bts_absolute_maximum(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 135 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 136 | (*(unsigned long *)(base + ds_cfg.bts_absolute_maximum.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 137 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 138 | static inline unsigned long get_bts_interrupt_threshold(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 139 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 140 | return *(unsigned long *)(base + ds_cfg.bts_interrupt_threshold.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 141 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 142 | static inline void set_bts_interrupt_threshold(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 143 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 144 | (*(unsigned long *)(base + ds_cfg.bts_interrupt_threshold.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 145 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 146 | static inline unsigned long get_from_ip(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 147 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 148 | return *(unsigned long *)(base + ds_cfg.from_ip.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 149 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 150 | static inline void set_from_ip(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 151 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 152 | (*(unsigned long *)(base + ds_cfg.from_ip.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 153 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 154 | static inline unsigned long get_to_ip(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 155 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 156 | return *(unsigned long *)(base + ds_cfg.to_ip.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 157 | } |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 158 | static inline void set_to_ip(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 159 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 160 | (*(unsigned long *)(base + ds_cfg.to_ip.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 161 | } |
| 162 | static inline unsigned char get_info_type(char *base) |
| 163 | { |
| 164 | return *(unsigned char *)(base + ds_cfg.info_type.offset); |
| 165 | } |
| 166 | static inline void set_info_type(char *base, unsigned char value) |
| 167 | { |
| 168 | (*(unsigned char *)(base + ds_cfg.info_type.offset)) = value; |
| 169 | } |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 170 | static inline unsigned long get_info_data(char *base) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 171 | { |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 172 | return *(unsigned long *)(base + ds_cfg.info_data.offset); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 173 | } |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 174 | static inline void set_info_data(char *base, unsigned long value) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 175 | { |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 176 | (*(unsigned long *)(base + ds_cfg.info_data.offset)) = value; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 180 | int ds_allocate(void **dsp, size_t bts_size_in_bytes) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 181 | { |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 182 | size_t bts_size_in_records; |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 183 | unsigned long bts; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 184 | void *ds; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 185 | |
| 186 | if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts) |
| 187 | return -EOPNOTSUPP; |
| 188 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 189 | if (bts_size_in_bytes < 0) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 190 | return -EINVAL; |
| 191 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 192 | bts_size_in_records = |
| 193 | bts_size_in_bytes / ds_cfg.sizeof_bts; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 194 | bts_size_in_bytes = |
| 195 | bts_size_in_records * ds_cfg.sizeof_bts; |
| 196 | |
| 197 | if (bts_size_in_bytes <= 0) |
| 198 | return -EINVAL; |
| 199 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 200 | bts = (unsigned long)kzalloc(bts_size_in_bytes, GFP_KERNEL); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 201 | |
| 202 | if (!bts) |
| 203 | return -ENOMEM; |
| 204 | |
| 205 | ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL); |
| 206 | |
| 207 | if (!ds) { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 208 | kfree((void *)bts); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 209 | return -ENOMEM; |
| 210 | } |
| 211 | |
| 212 | set_bts_buffer_base(ds, bts); |
| 213 | set_bts_index(ds, bts); |
| 214 | set_bts_absolute_maximum(ds, bts + bts_size_in_bytes); |
| 215 | set_bts_interrupt_threshold(ds, bts + bts_size_in_bytes + 1); |
| 216 | |
| 217 | *dsp = ds; |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | int ds_free(void **dsp) |
| 222 | { |
Cyrill Gorcunov | 431ef7a | 2008-04-01 19:41:50 +0400 | [diff] [blame] | 223 | if (*dsp) { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 224 | kfree((void *)get_bts_buffer_base(*dsp)); |
Cyrill Gorcunov | 431ef7a | 2008-04-01 19:41:50 +0400 | [diff] [blame] | 225 | kfree(*dsp); |
| 226 | *dsp = NULL; |
| 227 | } |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | int ds_get_bts_size(void *ds) |
| 232 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 233 | int size_in_bytes; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 234 | |
| 235 | if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts) |
| 236 | return -EOPNOTSUPP; |
| 237 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 238 | if (!ds) |
| 239 | return 0; |
| 240 | |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 241 | size_in_bytes = |
| 242 | get_bts_absolute_maximum(ds) - |
| 243 | get_bts_buffer_base(ds); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 244 | return size_in_bytes; |
| 245 | } |
| 246 | |
| 247 | int ds_get_bts_end(void *ds) |
| 248 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 249 | int size_in_bytes = ds_get_bts_size(ds); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 250 | |
| 251 | if (size_in_bytes <= 0) |
| 252 | return size_in_bytes; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 253 | |
| 254 | return size_in_bytes / ds_cfg.sizeof_bts; |
| 255 | } |
| 256 | |
| 257 | int ds_get_bts_index(void *ds) |
| 258 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 259 | int index_offset_in_bytes; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 260 | |
| 261 | if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts) |
| 262 | return -EOPNOTSUPP; |
| 263 | |
| 264 | index_offset_in_bytes = |
| 265 | get_bts_index(ds) - |
| 266 | get_bts_buffer_base(ds); |
| 267 | |
| 268 | return index_offset_in_bytes / ds_cfg.sizeof_bts; |
| 269 | } |
| 270 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 271 | int ds_set_overflow(void *ds, int method) |
| 272 | { |
| 273 | switch (method) { |
| 274 | case DS_O_SIGNAL: |
| 275 | return -EOPNOTSUPP; |
| 276 | case DS_O_WRAP: |
| 277 | return 0; |
| 278 | default: |
| 279 | return -EINVAL; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | int ds_get_overflow(void *ds) |
| 284 | { |
| 285 | return DS_O_WRAP; |
| 286 | } |
| 287 | |
| 288 | int ds_clear(void *ds) |
| 289 | { |
| 290 | int bts_size = ds_get_bts_size(ds); |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 291 | unsigned long bts_base; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 292 | |
| 293 | if (bts_size <= 0) |
| 294 | return bts_size; |
| 295 | |
| 296 | bts_base = get_bts_buffer_base(ds); |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 297 | memset((void *)bts_base, 0, bts_size); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 298 | |
| 299 | set_bts_index(ds, bts_base); |
| 300 | return 0; |
| 301 | } |
| 302 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 303 | int ds_read_bts(void *ds, int index, struct bts_struct *out) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 304 | { |
| 305 | void *bts; |
| 306 | |
| 307 | if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts) |
| 308 | return -EOPNOTSUPP; |
| 309 | |
| 310 | if (index < 0) |
| 311 | return -EINVAL; |
| 312 | |
| 313 | if (index >= ds_get_bts_size(ds)) |
| 314 | return -EINVAL; |
| 315 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 316 | bts = (void *)(get_bts_buffer_base(ds) + (index * ds_cfg.sizeof_bts)); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 317 | |
| 318 | memset(out, 0, sizeof(*out)); |
| 319 | if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) { |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 320 | out->qualifier = get_info_type(bts); |
| 321 | out->variant.jiffies = get_info_data(bts); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 322 | } else { |
| 323 | out->qualifier = BTS_BRANCH; |
| 324 | out->variant.lbr.from_ip = get_from_ip(bts); |
| 325 | out->variant.lbr.to_ip = get_to_ip(bts); |
| 326 | } |
| 327 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 328 | return sizeof(*out);; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | int ds_write_bts(void *ds, const struct bts_struct *in) |
| 332 | { |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 333 | unsigned long bts; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 334 | |
| 335 | if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts) |
| 336 | return -EOPNOTSUPP; |
| 337 | |
| 338 | if (ds_get_bts_size(ds) <= 0) |
| 339 | return -ENXIO; |
| 340 | |
| 341 | bts = get_bts_index(ds); |
| 342 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 343 | memset((void *)bts, 0, ds_cfg.sizeof_bts); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 344 | switch (in->qualifier) { |
| 345 | case BTS_INVALID: |
| 346 | break; |
| 347 | |
| 348 | case BTS_BRANCH: |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 349 | set_from_ip((void *)bts, in->variant.lbr.from_ip); |
| 350 | set_to_ip((void *)bts, in->variant.lbr.to_ip); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 351 | break; |
| 352 | |
| 353 | case BTS_TASK_ARRIVES: |
| 354 | case BTS_TASK_DEPARTS: |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 355 | set_from_ip((void *)bts, BTS_ESCAPE_ADDRESS); |
| 356 | set_info_type((void *)bts, in->qualifier); |
| 357 | set_info_data((void *)bts, in->variant.jiffies); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 358 | break; |
| 359 | |
| 360 | default: |
| 361 | return -EINVAL; |
| 362 | } |
| 363 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 364 | bts = bts + ds_cfg.sizeof_bts; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 365 | if (bts >= get_bts_absolute_maximum(ds)) |
| 366 | bts = get_bts_buffer_base(ds); |
| 367 | set_bts_index(ds, bts); |
| 368 | |
Markus Metzger | e6ae5d9 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 369 | return ds_cfg.sizeof_bts; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | unsigned long ds_debugctl_mask(void) |
| 373 | { |
| 374 | return ds_cfg.debugctl_mask; |
| 375 | } |
| 376 | |
| 377 | #ifdef __i386__ |
| 378 | static const struct ds_configuration ds_cfg_netburst = { |
| 379 | .sizeof_ds = 9 * 4, |
| 380 | .bts_buffer_base = { 0, 4 }, |
| 381 | .bts_index = { 4, 4 }, |
| 382 | .bts_absolute_maximum = { 8, 4 }, |
| 383 | .bts_interrupt_threshold = { 12, 4 }, |
| 384 | .sizeof_bts = 3 * 4, |
| 385 | .from_ip = { 0, 4 }, |
| 386 | .to_ip = { 4, 4 }, |
| 387 | .info_type = { 4, 1 }, |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 388 | .info_data = { 8, 4 }, |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 389 | .debugctl_mask = (1<<2)|(1<<3) |
| 390 | }; |
| 391 | |
| 392 | static const struct ds_configuration ds_cfg_pentium_m = { |
| 393 | .sizeof_ds = 9 * 4, |
| 394 | .bts_buffer_base = { 0, 4 }, |
| 395 | .bts_index = { 4, 4 }, |
| 396 | .bts_absolute_maximum = { 8, 4 }, |
| 397 | .bts_interrupt_threshold = { 12, 4 }, |
| 398 | .sizeof_bts = 3 * 4, |
| 399 | .from_ip = { 0, 4 }, |
| 400 | .to_ip = { 4, 4 }, |
| 401 | .info_type = { 4, 1 }, |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 402 | .info_data = { 8, 4 }, |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 403 | .debugctl_mask = (1<<6)|(1<<7) |
| 404 | }; |
| 405 | #endif /* _i386_ */ |
| 406 | |
| 407 | static const struct ds_configuration ds_cfg_core2 = { |
| 408 | .sizeof_ds = 9 * 8, |
| 409 | .bts_buffer_base = { 0, 8 }, |
| 410 | .bts_index = { 8, 8 }, |
| 411 | .bts_absolute_maximum = { 16, 8 }, |
| 412 | .bts_interrupt_threshold = { 24, 8 }, |
| 413 | .sizeof_bts = 3 * 8, |
| 414 | .from_ip = { 0, 8 }, |
| 415 | .to_ip = { 8, 8 }, |
| 416 | .info_type = { 8, 1 }, |
Markus Metzger | 3c68904 | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 417 | .info_data = { 16, 8 }, |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 418 | .debugctl_mask = (1<<6)|(1<<7)|(1<<9) |
| 419 | }; |
| 420 | |
| 421 | static inline void |
| 422 | ds_configure(const struct ds_configuration *cfg) |
| 423 | { |
| 424 | ds_cfg = *cfg; |
| 425 | } |
| 426 | |
| 427 | void __cpuinit ds_init_intel(struct cpuinfo_x86 *c) |
| 428 | { |
| 429 | switch (c->x86) { |
| 430 | case 0x6: |
| 431 | switch (c->x86_model) { |
| 432 | #ifdef __i386__ |
| 433 | case 0xD: |
| 434 | case 0xE: /* Pentium M */ |
| 435 | ds_configure(&ds_cfg_pentium_m); |
| 436 | break; |
| 437 | #endif /* _i386_ */ |
| 438 | case 0xF: /* Core2 */ |
| 439 | ds_configure(&ds_cfg_core2); |
| 440 | break; |
| 441 | default: |
| 442 | /* sorry, don't know about them */ |
| 443 | break; |
| 444 | } |
| 445 | break; |
| 446 | case 0xF: |
| 447 | switch (c->x86_model) { |
| 448 | #ifdef __i386__ |
| 449 | case 0x0: |
| 450 | case 0x1: |
| 451 | case 0x2: /* Netburst */ |
| 452 | ds_configure(&ds_cfg_netburst); |
| 453 | break; |
| 454 | #endif /* _i386_ */ |
| 455 | default: |
| 456 | /* sorry, don't know about them */ |
| 457 | break; |
| 458 | } |
| 459 | break; |
| 460 | default: |
| 461 | /* sorry, don't know about them */ |
| 462 | break; |
| 463 | } |
| 464 | } |