Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/x86/cpufreq/smist.c
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1 /*- 2 * Copyright (c) 2005 Bruno Ducrot 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 /* 26 * This driver is based upon information found by examining speedstep-0.5 27 * from Marc Lehman, which includes all the reverse engineering effort of 28 * Malik Martin (function 1 and 2 of the GSI). 29 * 30 * The correct way for the OS to take ownership from the BIOS was found by 31 * Hiroshi Miura (function 0 of the GSI). 32 * 33 * Finally, the int 15h call interface was (partially) documented by Intel. 34 * 35 * Many thanks to Jon Noack for testing and debugging this driver. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/bus.h> 43 #include <sys/cpu.h> 44 #include <sys/kernel.h> 45 #include <sys/module.h> 46 #include <sys/systm.h> 47 48 #include <machine/bus.h> 49 #include <machine/cputypes.h> 50 #include <machine/md_var.h> 51 #include <machine/vm86.h> 52 53 #include <dev/pci/pcivar.h> 54 #include <dev/pci/pcireg.h> 55 56 #include <vm/vm.h> 57 #include <vm/pmap.h> 58 59 #include "cpufreq_if.h" 60 61 #if 0 62 #define DPRINT(dev, x...) device_printf(dev, x) 63 #else 64 #define DPRINT(dev, x...) 65 #endif 66 67 struct smist_softc { 68 device_t dev; 69 int smi_cmd; 70 int smi_data; 71 int command; 72 int flags; 73 struct cf_setting sets[2]; /* Only two settings. */ 74 }; 75 76 static char smist_magic[] = "Copyright (c) 1999 Intel Corporation"; 77 78 static void smist_identify(driver_t *driver, device_t parent); 79 static int smist_probe(device_t dev); 80 static int smist_attach(device_t dev); 81 static int smist_detach(device_t dev); 82 static int smist_settings(device_t dev, struct cf_setting *sets, 83 int *count); 84 static int smist_set(device_t dev, const struct cf_setting *set); 85 static int smist_get(device_t dev, struct cf_setting *set); 86 static int smist_type(device_t dev, int *type); 87 88 static device_method_t smist_methods[] = { 89 /* Device interface */ 90 DEVMETHOD(device_identify, smist_identify), 91 DEVMETHOD(device_probe, smist_probe), 92 DEVMETHOD(device_attach, smist_attach), 93 DEVMETHOD(device_detach, smist_detach), 94 95 /* cpufreq interface */ 96 DEVMETHOD(cpufreq_drv_set, smist_set), 97 DEVMETHOD(cpufreq_drv_get, smist_get), 98 DEVMETHOD(cpufreq_drv_type, smist_type), 99 DEVMETHOD(cpufreq_drv_settings, smist_settings), 100 101 {0, 0} 102 }; 103 104 static driver_t smist_driver = { 105 "smist", smist_methods, sizeof(struct smist_softc) 106 }; 107 static devclass_t smist_devclass; 108 DRIVER_MODULE(smist, cpu, smist_driver, smist_devclass, 0, 0); 109 110 struct piix4_pci_device { 111 uint16_t vendor; 112 uint16_t device; 113 char *desc; 114 }; 115 116 static struct piix4_pci_device piix4_pci_devices[] = { 117 {0x8086, 0x7113, "Intel PIIX4 ISA bridge"}, 118 {0x8086, 0x719b, "Intel PIIX4 ISA bridge (embedded in MX440 chipset)"}, 119 120 {0, 0, NULL}, 121 }; 122 123 #define SET_OWNERSHIP 0 124 #define GET_STATE 1 125 #define SET_STATE 2 126 127 static int 128 int15_gsic_call(int *sig, int *smi_cmd, int *command, int *smi_data, int *flags) 129 { 130 struct vm86frame vmf; 131 132 bzero(&vmf, sizeof(vmf)); 133 vmf.vmf_eax = 0x0000E980; /* IST support */ 134 vmf.vmf_edx = 0x47534943; /* 'GSIC' in ASCII */ 135 vm86_intcall(0x15, &vmf); 136 137 if (vmf.vmf_eax == 0x47534943) { 138 *sig = vmf.vmf_eax; 139 *smi_cmd = vmf.vmf_ebx & 0xff; 140 *command = (vmf.vmf_ebx >> 16) & 0xff; 141 *smi_data = vmf.vmf_ecx; 142 *flags = vmf.vmf_edx; 143 } else { 144 *sig = -1; 145 *smi_cmd = -1; 146 *command = -1; 147 *smi_data = -1; 148 *flags = -1; 149 } 150 151 return (0); 152 } 153 154 /* Temporary structure to hold mapped page and status. */ 155 struct set_ownership_data { 156 int smi_cmd; 157 int command; 158 int result; 159 void *buf; 160 }; 161 162 /* Perform actual SMI call to enable SpeedStep. */ 163 static void 164 set_ownership_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 165 { 166 struct set_ownership_data *data; 167 168 data = arg; 169 if (error) { 170 data->result = error; 171 return; 172 } 173 174 /* Copy in the magic string and send it by writing to the SMI port. */ 175 strlcpy(data->buf, smist_magic, PAGE_SIZE); 176 __asm __volatile( 177 "movl $-1, %%edi\n\t" 178 "out %%al, (%%dx)\n" 179 : "=D" (data->result) 180 : "a" (data->command), 181 "b" (0), 182 "c" (0), 183 "d" (data->smi_cmd), 184 "S" ((uint32_t)segs[0].ds_addr) 185 ); 186 } 187 188 static int 189 set_ownership(device_t dev) 190 { 191 struct smist_softc *sc; 192 struct set_ownership_data cb_data; 193 bus_dma_tag_t tag; 194 bus_dmamap_t map; 195 196 /* 197 * Specify the region to store the magic string. Since its address is 198 * passed to the BIOS in a 32-bit register, we have to make sure it is 199 * located in a physical page below 4 GB (i.e., for PAE.) 200 */ 201 sc = device_get_softc(dev); 202 if (bus_dma_tag_create(/*parent*/ NULL, 203 /*alignment*/ PAGE_SIZE, /*no boundary*/ 0, 204 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, /*highaddr*/ BUS_SPACE_MAXADDR, 205 NULL, NULL, /*maxsize*/ PAGE_SIZE, /*segments*/ 1, 206 /*maxsegsize*/ PAGE_SIZE, 0, busdma_lock_mutex, &Giant, 207 &tag) != 0) { 208 device_printf(dev, "can't create mem tag\n"); 209 return (ENXIO); 210 } 211 if (bus_dmamem_alloc(tag, &cb_data.buf, BUS_DMA_NOWAIT, &map) != 0) { 212 bus_dma_tag_destroy(tag); 213 device_printf(dev, "can't alloc mapped mem\n"); 214 return (ENXIO); 215 } 216 217 /* Load the physical page map and take ownership in the callback. */ 218 cb_data.smi_cmd = sc->smi_cmd; 219 cb_data.command = sc->command; 220 if (bus_dmamap_load(tag, map, cb_data.buf, PAGE_SIZE, set_ownership_cb, 221 &cb_data, BUS_DMA_NOWAIT) != 0) { 222 bus_dmamem_free(tag, cb_data.buf, map); 223 bus_dma_tag_destroy(tag); 224 device_printf(dev, "can't load mem\n"); 225 return (ENXIO); 226 } 227 DPRINT(dev, "taking ownership over BIOS return %d\n", cb_data.result); 228 bus_dmamap_unload(tag, map); 229 bus_dmamem_free(tag, cb_data.buf, map); 230 bus_dma_tag_destroy(tag); 231 return (cb_data.result ? ENXIO : 0); 232 } 233 234 static int 235 getset_state(struct smist_softc *sc, int *state, int function) 236 { 237 int new_state; 238 int result; 239 int eax; 240 241 if (!sc) 242 return (ENXIO); 243 244 if (function != GET_STATE && function != SET_STATE) 245 return (EINVAL); 246 247 DPRINT(sc->dev, "calling GSI\n"); 248 249 __asm __volatile( 250 "movl $-1, %%edi\n\t" 251 "out %%al, (%%dx)\n" 252 : "=a" (eax), 253 "=b" (new_state), 254 "=D" (result) 255 : "a" (sc->command), 256 "b" (function), 257 "c" (*state), 258 "d" (sc->smi_cmd) 259 ); 260 261 DPRINT(sc->dev, "GSI returned: eax %.8x ebx %.8x edi %.8x\n", 262 eax, new_state, result); 263 264 *state = new_state & 1; 265 266 switch (function) { 267 case GET_STATE: 268 if (eax) 269 return (ENXIO); 270 break; 271 case SET_STATE: 272 if (result) 273 return (ENXIO); 274 break; 275 } 276 return (0); 277 } 278 279 static void 280 smist_identify(driver_t *driver, device_t parent) 281 { 282 struct piix4_pci_device *id; 283 device_t piix4 = NULL; 284 285 if (resource_disabled("ichst", 0)) 286 return; 287 288 /* Check for a supported processor */ 289 if (cpu_vendor_id != CPU_VENDOR_INTEL) 290 return; 291 switch (cpu_id & 0xff0) { 292 case 0x680: /* Pentium III [coppermine] */ 293 case 0x6a0: /* Pentium III [Tualatin] */ 294 break; 295 default: 296 return; 297 } 298 299 /* Check for a supported PCI-ISA bridge */ 300 for (id = piix4_pci_devices; id->desc != NULL; ++id) { 301 if ((piix4 = pci_find_device(id->vendor, id->device)) != NULL) 302 break; 303 } 304 if (!piix4) 305 return; 306 307 if (bootverbose) 308 printf("smist: found supported isa bridge %s\n", id->desc); 309 310 if (device_find_child(parent, "smist", -1) != NULL) 311 return; 312 if (BUS_ADD_CHILD(parent, 30, "smist", -1) == NULL) 313 device_printf(parent, "smist: add child failed\n"); 314 } 315 316 static int 317 smist_probe(device_t dev) 318 { 319 struct smist_softc *sc; 320 device_t ichss_dev, perf_dev; 321 int sig, smi_cmd, command, smi_data, flags; 322 int type; 323 int rv; 324 325 if (resource_disabled("smist", 0)) 326 return (ENXIO); 327 328 sc = device_get_softc(dev); 329 330 /* 331 * If the ACPI perf or ICH SpeedStep drivers have attached and not 332 * just offering info, let them manage things. 333 */ 334 perf_dev = device_find_child(device_get_parent(dev), "acpi_perf", -1); 335 if (perf_dev && device_is_attached(perf_dev)) { 336 rv = CPUFREQ_DRV_TYPE(perf_dev, &type); 337 if (rv == 0 && (type & CPUFREQ_FLAG_INFO_ONLY) == 0) 338 return (ENXIO); 339 } 340 ichss_dev = device_find_child(device_get_parent(dev), "ichss", -1); 341 if (ichss_dev && device_is_attached(ichss_dev)) 342 return (ENXIO); 343 344 int15_gsic_call(&sig, &smi_cmd, &command, &smi_data, &flags); 345 if (bootverbose) 346 device_printf(dev, "sig %.8x smi_cmd %.4x command %.2x " 347 "smi_data %.4x flags %.8x\n", 348 sig, smi_cmd, command, smi_data, flags); 349 350 if (sig != -1) { 351 sc->smi_cmd = smi_cmd; 352 sc->smi_data = smi_data; 353 354 /* 355 * Sometimes int 15h 'GSIC' returns 0x80 for command, when 356 * it is actually 0x82. The Windows driver will overwrite 357 * this value given by the registry. 358 */ 359 if (command == 0x80) { 360 device_printf(dev, 361 "GSIC returned cmd 0x80, should be 0x82\n"); 362 command = 0x82; 363 } 364 sc->command = (sig & 0xffffff00) | (command & 0xff); 365 sc->flags = flags; 366 } else { 367 /* Give some default values */ 368 sc->smi_cmd = 0xb2; 369 sc->smi_data = 0xb3; 370 sc->command = 0x47534982; 371 sc->flags = 0; 372 } 373 374 device_set_desc(dev, "SpeedStep SMI"); 375 376 return (-1500); 377 } 378 379 static int 380 smist_attach(device_t dev) 381 { 382 struct smist_softc *sc; 383 384 sc = device_get_softc(dev); 385 sc->dev = dev; 386 387 /* If we can't take ownership over BIOS, then bail out */ 388 if (set_ownership(dev) != 0) 389 return (ENXIO); 390 391 /* Setup some defaults for our exported settings. */ 392 sc->sets[0].freq = CPUFREQ_VAL_UNKNOWN; 393 sc->sets[0].volts = CPUFREQ_VAL_UNKNOWN; 394 sc->sets[0].power = CPUFREQ_VAL_UNKNOWN; 395 sc->sets[0].lat = 1000; 396 sc->sets[0].dev = dev; 397 sc->sets[1] = sc->sets[0]; 398 399 cpufreq_register(dev); 400 401 return (0); 402 } 403 404 static int 405 smist_detach(device_t dev) 406 { 407 408 return (cpufreq_unregister(dev)); 409 } 410 411 static int 412 smist_settings(device_t dev, struct cf_setting *sets, int *count) 413 { 414 struct smist_softc *sc; 415 struct cf_setting set; 416 int first, i; 417 418 if (sets == NULL || count == NULL) 419 return (EINVAL); 420 if (*count < 2) { 421 *count = 2; 422 return (E2BIG); 423 } 424 sc = device_get_softc(dev); 425 426 /* 427 * Estimate frequencies for both levels, temporarily switching to 428 * the other one if we haven't calibrated it yet. 429 */ 430 for (i = 0; i < 2; i++) { 431 if (sc->sets[i].freq == CPUFREQ_VAL_UNKNOWN) { 432 first = (i == 0) ? 1 : 0; 433 smist_set(dev, &sc->sets[i]); 434 smist_get(dev, &set); 435 smist_set(dev, &sc->sets[first]); 436 } 437 } 438 439 bcopy(sc->sets, sets, sizeof(sc->sets)); 440 *count = 2; 441 442 return (0); 443 } 444 445 static int 446 smist_set(device_t dev, const struct cf_setting *set) 447 { 448 struct smist_softc *sc; 449 int rv, state, req_state, try; 450 451 /* Look up appropriate bit value based on frequency. */ 452 sc = device_get_softc(dev); 453 if (CPUFREQ_CMP(set->freq, sc->sets[0].freq)) 454 req_state = 0; 455 else if (CPUFREQ_CMP(set->freq, sc->sets[1].freq)) 456 req_state = 1; 457 else 458 return (EINVAL); 459 460 DPRINT(dev, "requested setting %d\n", req_state); 461 462 rv = getset_state(sc, &state, GET_STATE); 463 if (state == req_state) 464 return (0); 465 466 try = 3; 467 do { 468 rv = getset_state(sc, &req_state, SET_STATE); 469 470 /* Sleep for 200 microseconds. This value is just a guess. */ 471 if (rv) 472 DELAY(200); 473 } while (rv && --try); 474 DPRINT(dev, "set_state return %d, tried %d times\n", 475 rv, 4 - try); 476 477 return (rv); 478 } 479 480 static int 481 smist_get(device_t dev, struct cf_setting *set) 482 { 483 struct smist_softc *sc; 484 uint64_t rate; 485 int state; 486 int rv; 487 488 sc = device_get_softc(dev); 489 rv = getset_state(sc, &state, GET_STATE); 490 if (rv != 0) 491 return (rv); 492 493 /* If we haven't changed settings yet, estimate the current value. */ 494 if (sc->sets[state].freq == CPUFREQ_VAL_UNKNOWN) { 495 cpu_est_clockrate(0, &rate); 496 sc->sets[state].freq = rate / 1000000; 497 DPRINT(dev, "get calibrated new rate of %d\n", 498 sc->sets[state].freq); 499 } 500 *set = sc->sets[state]; 501 502 return (0); 503 } 504 505 static int 506 smist_type(device_t dev, int *type) 507 { 508 509 if (type == NULL) 510 return (EINVAL); 511 512 *type = CPUFREQ_TYPE_ABSOLUTE; 513 return (0); 514 }
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