| 1 | /* $NetBSD: pci_msi_machdep.c,v 1.9 2015/08/17 06:16:03 knakahara Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Internet Initiative Japan Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * TODO |
| 31 | * |
| 32 | * - PBA (Pending Bit Array) support |
| 33 | * - HyperTransport mapping support |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | __KERNEL_RCSID(0, "$NetBSD: pci_msi_machdep.c,v 1.9 2015/08/17 06:16:03 knakahara Exp $" ); |
| 38 | |
| 39 | #include "opt_intrdebug.h" |
| 40 | |
| 41 | #include <sys/types.h> |
| 42 | #include <sys/param.h> |
| 43 | #include <sys/time.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/cpu.h> |
| 46 | #include <sys/errno.h> |
| 47 | #include <sys/device.h> |
| 48 | #include <sys/intr.h> |
| 49 | #include <sys/kmem.h> |
| 50 | #include <sys/malloc.h> |
| 51 | |
| 52 | #include <dev/pci/pcivar.h> |
| 53 | |
| 54 | #include <machine/i82093var.h> |
| 55 | #include <machine/pic.h> |
| 56 | |
| 57 | #include <x86/pci/msipic.h> |
| 58 | #include <x86/pci/pci_msi_machdep.h> |
| 59 | |
| 60 | #ifdef INTRDEBUG |
| 61 | #define MSIDEBUG |
| 62 | #endif |
| 63 | |
| 64 | #ifdef MSIDEBUG |
| 65 | #define DPRINTF(msg) printf msg |
| 66 | #else |
| 67 | #define DPRINTF(msg) |
| 68 | #endif |
| 69 | |
| 70 | static pci_intr_handle_t |
| 71 | pci_msi_calculate_handle(struct pic *msi_pic, int vector) |
| 72 | { |
| 73 | pci_intr_handle_t pih; |
| 74 | |
| 75 | KASSERT(msipic_is_msi_pic(msi_pic)); |
| 76 | |
| 77 | pih = __SHIFTIN((uint64_t)msipic_get_devid(msi_pic), MSI_INT_DEV_MASK) |
| 78 | | __SHIFTIN((uint64_t)vector, MSI_INT_VEC_MASK) |
| 79 | | APIC_INT_VIA_MSI; |
| 80 | if (msi_pic->pic_type == PIC_MSI) |
| 81 | MSI_INT_MAKE_MSI(pih); |
| 82 | else if (msi_pic->pic_type == PIC_MSIX) |
| 83 | MSI_INT_MAKE_MSIX(pih); |
| 84 | else |
| 85 | panic("%s: Unexpected pic_type: %d\n" , __func__, |
| 86 | msi_pic->pic_type); |
| 87 | |
| 88 | return pih; |
| 89 | } |
| 90 | |
| 91 | static pci_intr_handle_t * |
| 92 | pci_msi_alloc_vectors(struct pic *msi_pic, uint *table_indexes, int *count) |
| 93 | { |
| 94 | struct intrsource *isp; |
| 95 | pci_intr_handle_t *vectors, pih; |
| 96 | int i; |
| 97 | const char *intrstr; |
| 98 | char intrstr_buf[INTRIDBUF]; |
| 99 | |
| 100 | vectors = kmem_zalloc(sizeof(vectors[0]) * (*count), KM_SLEEP); |
| 101 | if (vectors == NULL) { |
| 102 | DPRINTF(("cannot allocate vectors\n" )); |
| 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | mutex_enter(&cpu_lock); |
| 107 | for (i = 0; i < *count; i++) { |
| 108 | u_int table_index; |
| 109 | |
| 110 | if (table_indexes == NULL) |
| 111 | table_index = i; |
| 112 | else |
| 113 | table_index = table_indexes[i]; |
| 114 | |
| 115 | pih = pci_msi_calculate_handle(msi_pic, table_index); |
| 116 | |
| 117 | intrstr = x86_pci_msi_string(NULL, pih, intrstr_buf, |
| 118 | sizeof(intrstr_buf)); |
| 119 | isp = intr_allocate_io_intrsource(intrstr); |
| 120 | if (isp == NULL) { |
| 121 | mutex_exit(&cpu_lock); |
| 122 | DPRINTF(("can't allocate io_intersource\n" )); |
| 123 | kmem_free(vectors, sizeof(vectors[0]) * (*count)); |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | vectors[i] = pih; |
| 128 | } |
| 129 | mutex_exit(&cpu_lock); |
| 130 | |
| 131 | return vectors; |
| 132 | } |
| 133 | |
| 134 | static void |
| 135 | pci_msi_free_vectors(struct pic *msi_pic, pci_intr_handle_t *pihs, int count) |
| 136 | { |
| 137 | pci_intr_handle_t pih; |
| 138 | int i; |
| 139 | const char *intrstr; |
| 140 | char intrstr_buf[INTRIDBUF]; |
| 141 | |
| 142 | mutex_enter(&cpu_lock); |
| 143 | for (i = 0; i < count; i++) { |
| 144 | pih = pci_msi_calculate_handle(msi_pic, i); |
| 145 | intrstr = x86_pci_msi_string(NULL, pih, intrstr_buf, |
| 146 | sizeof(intrstr_buf)); |
| 147 | intr_free_io_intrsource(intrstr); |
| 148 | } |
| 149 | mutex_exit(&cpu_lock); |
| 150 | |
| 151 | kmem_free(pihs, sizeof(pihs[0]) * count); |
| 152 | } |
| 153 | |
| 154 | static int |
| 155 | pci_msi_alloc_common(pci_intr_handle_t **ihps, int *count, |
| 156 | const struct pci_attach_args *pa, bool exact) |
| 157 | { |
| 158 | struct pic *msi_pic; |
| 159 | pci_intr_handle_t *vectors; |
| 160 | int error, i; |
| 161 | |
| 162 | if ((pa->pa_flags & PCI_FLAGS_MSI_OKAY) == 0) { |
| 163 | DPRINTF(("PCI host bridge does not support MSI.\n" )); |
| 164 | return ENODEV; |
| 165 | } |
| 166 | |
| 167 | msi_pic = msipic_construct_msi_pic(pa); |
| 168 | if (msi_pic == NULL) { |
| 169 | DPRINTF(("cannot allocate MSI pic.\n" )); |
| 170 | return EINVAL; |
| 171 | } |
| 172 | |
| 173 | vectors = NULL; |
| 174 | while (*count > 0) { |
| 175 | vectors = pci_msi_alloc_vectors(msi_pic, NULL, count); |
| 176 | if (vectors != NULL) |
| 177 | break; |
| 178 | |
| 179 | if (exact) { |
| 180 | DPRINTF(("cannot allocate MSI vectors.\n" )); |
| 181 | msipic_destruct_msi_pic(msi_pic); |
| 182 | return ENOMEM; |
| 183 | } else { |
| 184 | (*count) >>= 1; /* must be power of 2. */ |
| 185 | continue; |
| 186 | } |
| 187 | } |
| 188 | if (vectors == NULL) { |
| 189 | DPRINTF(("cannot allocate MSI vectors.\n" )); |
| 190 | msipic_destruct_msi_pic(msi_pic); |
| 191 | return ENOMEM; |
| 192 | } |
| 193 | |
| 194 | for (i = 0; i < *count; i++) { |
| 195 | MSI_INT_MAKE_MSI(vectors[i]); |
| 196 | } |
| 197 | |
| 198 | error = msipic_set_msi_vectors(msi_pic, NULL, *count); |
| 199 | if (error) { |
| 200 | pci_msi_free_vectors(msi_pic, vectors, *count); |
| 201 | msipic_destruct_msi_pic(msi_pic); |
| 202 | return error; |
| 203 | } |
| 204 | |
| 205 | *ihps = vectors; |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static void * |
| 210 | pci_msi_common_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, |
| 211 | int level, int (*func)(void *), void *arg, struct pic *pic, |
| 212 | const char *xname) |
| 213 | { |
| 214 | int irq, pin; |
| 215 | bool mpsafe; |
| 216 | |
| 217 | KASSERT(INT_VIA_MSI(ih)); |
| 218 | |
| 219 | irq = -1; |
| 220 | pin = MSI_INT_VEC(ih); |
| 221 | mpsafe = ((ih & MPSAFE_MASK) != 0); |
| 222 | |
| 223 | return intr_establish_xname(irq, pic, pin, IST_EDGE, level, func, arg, |
| 224 | mpsafe, xname); |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | pci_msi_common_disestablish(pci_chipset_tag_t pc, void *cookie) |
| 229 | { |
| 230 | |
| 231 | intr_disestablish(cookie); |
| 232 | } |
| 233 | |
| 234 | static int |
| 235 | pci_msix_alloc_common(pci_intr_handle_t **ihps, u_int *table_indexes, |
| 236 | int *count, const struct pci_attach_args *pa, bool exact) |
| 237 | { |
| 238 | struct pic *msix_pic; |
| 239 | pci_intr_handle_t *vectors; |
| 240 | int error, i; |
| 241 | |
| 242 | if ((pa->pa_flags & PCI_FLAGS_MSIX_OKAY) == 0) { |
| 243 | DPRINTF(("PCI host bridge does not support MSI-X.\n" )); |
| 244 | return ENODEV; |
| 245 | } |
| 246 | |
| 247 | msix_pic = msipic_construct_msix_pic(pa); |
| 248 | if (msix_pic == NULL) |
| 249 | return EINVAL; |
| 250 | |
| 251 | vectors = NULL; |
| 252 | while (*count > 0) { |
| 253 | vectors = pci_msi_alloc_vectors(msix_pic, table_indexes, count); |
| 254 | if (vectors != NULL) |
| 255 | break; |
| 256 | |
| 257 | if (exact) { |
| 258 | DPRINTF(("cannot allocate MSI-X vectors.\n" )); |
| 259 | msipic_destruct_msix_pic(msix_pic); |
| 260 | return ENOMEM; |
| 261 | } else { |
| 262 | (*count)--; |
| 263 | continue; |
| 264 | } |
| 265 | } |
| 266 | if (vectors == NULL) { |
| 267 | DPRINTF(("cannot allocate MSI-X vectors.\n" )); |
| 268 | msipic_destruct_msix_pic(msix_pic); |
| 269 | return ENOMEM; |
| 270 | } |
| 271 | |
| 272 | for (i = 0; i < *count; i++) { |
| 273 | MSI_INT_MAKE_MSIX(vectors[i]); |
| 274 | } |
| 275 | |
| 276 | error = msipic_set_msi_vectors(msix_pic, vectors, *count); |
| 277 | if (error) { |
| 278 | pci_msi_free_vectors(msix_pic, vectors, *count); |
| 279 | msipic_destruct_msix_pic(msix_pic); |
| 280 | return error; |
| 281 | } |
| 282 | |
| 283 | *ihps = vectors; |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int |
| 288 | x86_pci_msi_alloc(pci_intr_handle_t **ihps, int *count, |
| 289 | const struct pci_attach_args *pa) |
| 290 | { |
| 291 | |
| 292 | return pci_msi_alloc_common(ihps, count, pa, false); |
| 293 | } |
| 294 | |
| 295 | static int |
| 296 | x86_pci_msi_alloc_exact(pci_intr_handle_t **ihps, int count, |
| 297 | const struct pci_attach_args *pa) |
| 298 | { |
| 299 | |
| 300 | return pci_msi_alloc_common(ihps, &count, pa, true); |
| 301 | } |
| 302 | |
| 303 | static void |
| 304 | x86_pci_msi_release_internal(pci_intr_handle_t *pihs, int count) |
| 305 | { |
| 306 | struct pic *pic; |
| 307 | |
| 308 | pic = msipic_find_msi_pic(MSI_INT_DEV(pihs[0])); |
| 309 | if (pic == NULL) |
| 310 | return; |
| 311 | |
| 312 | pci_msi_free_vectors(pic, pihs, count); |
| 313 | msipic_destruct_msi_pic(pic); |
| 314 | } |
| 315 | |
| 316 | static int |
| 317 | x86_pci_msix_alloc(pci_intr_handle_t **ihps, int *count, |
| 318 | const struct pci_attach_args *pa) |
| 319 | { |
| 320 | |
| 321 | return pci_msix_alloc_common(ihps, NULL, count, pa, false); |
| 322 | } |
| 323 | |
| 324 | static int |
| 325 | x86_pci_msix_alloc_exact(pci_intr_handle_t **ihps, int count, |
| 326 | const struct pci_attach_args *pa) |
| 327 | { |
| 328 | |
| 329 | return pci_msix_alloc_common(ihps, NULL, &count, pa, true); |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | x86_pci_msix_alloc_map(pci_intr_handle_t **ihps, u_int *table_indexes, |
| 334 | int count, const struct pci_attach_args *pa) |
| 335 | { |
| 336 | |
| 337 | return pci_msix_alloc_common(ihps, table_indexes, &count, pa, true); |
| 338 | } |
| 339 | |
| 340 | static void |
| 341 | x86_pci_msix_release_internal(pci_intr_handle_t *pihs, int count) |
| 342 | { |
| 343 | struct pic *pic; |
| 344 | |
| 345 | pic = msipic_find_msi_pic(MSI_INT_DEV(pihs[0])); |
| 346 | if (pic == NULL) |
| 347 | return; |
| 348 | |
| 349 | pci_msi_free_vectors(pic, pihs, count); |
| 350 | msipic_destruct_msix_pic(pic); |
| 351 | } |
| 352 | |
| 353 | /*****************************************************************************/ |
| 354 | /* |
| 355 | * extern for MD code. |
| 356 | */ |
| 357 | |
| 358 | /* |
| 359 | * Return intrid for a MSI/MSI-X device. |
| 360 | * "buf" must be allocated by caller. |
| 361 | */ |
| 362 | const char * |
| 363 | x86_pci_msi_string(pci_chipset_tag_t pc, pci_intr_handle_t ih, char *buf, |
| 364 | size_t len) |
| 365 | { |
| 366 | int dev, vec; |
| 367 | |
| 368 | KASSERT(INT_VIA_MSI(ih)); |
| 369 | |
| 370 | dev = MSI_INT_DEV(ih); |
| 371 | vec = MSI_INT_VEC(ih); |
| 372 | if (MSI_INT_IS_MSIX(ih)) |
| 373 | snprintf(buf, len, "msix%d vec %d" , dev, vec); |
| 374 | else |
| 375 | snprintf(buf, len, "msi%d vec %d" , dev, vec); |
| 376 | |
| 377 | return buf; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Release MSI handles. |
| 382 | */ |
| 383 | void |
| 384 | x86_pci_msi_release(pci_chipset_tag_t pc, pci_intr_handle_t *pihs, int count) |
| 385 | { |
| 386 | |
| 387 | if (count < 1) |
| 388 | return; |
| 389 | |
| 390 | return x86_pci_msi_release_internal(pihs, count); |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Establish a MSI handle. |
| 395 | * If multiple MSI handle is requied to establish, device driver must call |
| 396 | * this function for each handle. |
| 397 | */ |
| 398 | void * |
| 399 | x86_pci_msi_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, |
| 400 | int level, int (*func)(void *), void *arg, const char *xname) |
| 401 | { |
| 402 | struct pic *pic; |
| 403 | |
| 404 | pic = msipic_find_msi_pic(MSI_INT_DEV(ih)); |
| 405 | if (pic == NULL) { |
| 406 | DPRINTF(("pci_intr_handler has no msi_pic\n" )); |
| 407 | return NULL; |
| 408 | } |
| 409 | |
| 410 | return pci_msi_common_establish(pc, ih, level, func, arg, pic, xname); |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Disestablish a MSI handle. |
| 415 | * If multiple MSI handle is requied to disestablish, device driver must call |
| 416 | * this function for each handle. |
| 417 | */ |
| 418 | void |
| 419 | x86_pci_msi_disestablish(pci_chipset_tag_t pc, void *cookie) |
| 420 | { |
| 421 | |
| 422 | pci_msi_common_disestablish(pc, cookie); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Release MSI-X handles. |
| 427 | */ |
| 428 | void |
| 429 | x86_pci_msix_release(pci_chipset_tag_t pc, pci_intr_handle_t *pihs, int count) |
| 430 | { |
| 431 | |
| 432 | if (count < 1) |
| 433 | return; |
| 434 | |
| 435 | return x86_pci_msix_release_internal(pihs, count); |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Establish a MSI-X handle. |
| 440 | * If multiple MSI-X handle is requied to establish, device driver must call |
| 441 | * this function for each handle. |
| 442 | */ |
| 443 | void * |
| 444 | x86_pci_msix_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, |
| 445 | int level, int (*func)(void *), void *arg, const char *xname) |
| 446 | { |
| 447 | struct pic *pic; |
| 448 | |
| 449 | pic = msipic_find_msi_pic(MSI_INT_DEV(ih)); |
| 450 | if (pic == NULL) { |
| 451 | DPRINTF(("pci_intr_handler has no msi_pic\n" )); |
| 452 | return NULL; |
| 453 | } |
| 454 | |
| 455 | return pci_msi_common_establish(pc, ih, level, func, arg, pic, xname); |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Disestablish a MSI-X handle. |
| 460 | * If multiple MSI-X handle is requied to disestablish, device driver must call |
| 461 | * this function for each handle. |
| 462 | */ |
| 463 | void |
| 464 | x86_pci_msix_disestablish(pci_chipset_tag_t pc, void *cookie) |
| 465 | { |
| 466 | |
| 467 | pci_msi_common_disestablish(pc, cookie); |
| 468 | } |
| 469 | |
| 470 | /*****************************************************************************/ |
| 471 | /* |
| 472 | * extern for MI code. |
| 473 | */ |
| 474 | |
| 475 | /* |
| 476 | * This function is used by device drivers like pci_intr_map(). |
| 477 | * |
| 478 | * "ihps" is the array of vector numbers which MSI used instead of IRQ number. |
| 479 | * "count" must be power of 2. |
| 480 | * "count" can decrease if struct intrsource cannot be allocated. |
| 481 | * if count == 0, return non-zero value. |
| 482 | */ |
| 483 | int |
| 484 | pci_msi_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, |
| 485 | int *count) |
| 486 | { |
| 487 | int hw_max; |
| 488 | |
| 489 | /* MSI vector count must be power of 2. */ |
| 490 | KASSERT(*count > 0); |
| 491 | KASSERT(((*count - 1) & *count) == 0); |
| 492 | |
| 493 | hw_max = pci_msi_count(pa->pa_pc, pa->pa_tag); |
| 494 | if (hw_max == 0) |
| 495 | return ENODEV; |
| 496 | |
| 497 | if (*count > hw_max) { |
| 498 | DPRINTF(("cut off MSI count to %d\n" , hw_max)); |
| 499 | *count = hw_max; /* cut off hw_max */ |
| 500 | } |
| 501 | |
| 502 | return x86_pci_msi_alloc(ihps, count, pa); |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * This function is used by device drivers like pci_intr_map(). |
| 507 | * |
| 508 | * "ihps" is the array of vector numbers which MSI used instead of IRQ number. |
| 509 | * "count" must be power of 2. |
| 510 | * "count" can not decrease. |
| 511 | * If "count" struct intrsources cannot be allocated, return non-zero value. |
| 512 | */ |
| 513 | int |
| 514 | pci_msi_alloc_exact(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, |
| 515 | int count) |
| 516 | { |
| 517 | int hw_max; |
| 518 | |
| 519 | /* MSI vector count must be power of 2. */ |
| 520 | KASSERT(count > 0); |
| 521 | KASSERT(((count - 1) & count) == 0); |
| 522 | |
| 523 | hw_max = pci_msi_count(pa->pa_pc, pa->pa_tag); |
| 524 | if (hw_max == 0) |
| 525 | return ENODEV; |
| 526 | |
| 527 | if (count > hw_max) { |
| 528 | DPRINTF(("over hardware max MSI count %d\n" , hw_max)); |
| 529 | return EINVAL; |
| 530 | } |
| 531 | |
| 532 | return x86_pci_msi_alloc_exact(ihps, count, pa); |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * This function is used by device drivers like pci_intr_map(). |
| 537 | * |
| 538 | * "ihps" is the array of vector numbers which MSI-X used instead of IRQ number. |
| 539 | * "count" can decrease if enough struct intrsources cannot be allocated. |
| 540 | * if count == 0, return non-zero value. |
| 541 | */ |
| 542 | int |
| 543 | pci_msix_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, |
| 544 | int *count) |
| 545 | { |
| 546 | int hw_max; |
| 547 | |
| 548 | KASSERT(*count > 0); |
| 549 | |
| 550 | hw_max = pci_msix_count(pa->pa_pc, pa->pa_tag); |
| 551 | if (hw_max == 0) |
| 552 | return ENODEV; |
| 553 | |
| 554 | if (*count > hw_max) { |
| 555 | DPRINTF(("cut off MSI-X count to %d\n" , hw_max)); |
| 556 | *count = hw_max; /* cut off hw_max */ |
| 557 | } |
| 558 | |
| 559 | return x86_pci_msix_alloc(ihps, count, pa); |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * This function is used by device drivers like pci_intr_map(). |
| 564 | * |
| 565 | * "ihps" is the array of vector numbers which MSI-X used instead of IRQ number. |
| 566 | * "count" can not decrease. |
| 567 | * If "count" struct intrsource cannot be allocated, return non-zero value. |
| 568 | */ |
| 569 | int |
| 570 | pci_msix_alloc_exact(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, |
| 571 | int count) |
| 572 | { |
| 573 | int hw_max; |
| 574 | |
| 575 | KASSERT(count > 0); |
| 576 | |
| 577 | hw_max = pci_msix_count(pa->pa_pc, pa->pa_tag); |
| 578 | if (hw_max == 0) |
| 579 | return ENODEV; |
| 580 | |
| 581 | if (count > hw_max) { |
| 582 | DPRINTF(("over hardware max MSI-X count %d\n" , hw_max)); |
| 583 | return EINVAL; |
| 584 | } |
| 585 | |
| 586 | return x86_pci_msix_alloc_exact(ihps, count, pa); |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * This function is used by device drivers like pci_intr_map(). |
| 591 | * Futhermore, this function can map each handle to a MSI-X table index. |
| 592 | * |
| 593 | * "ihps" is the array of vector numbers which MSI-X used instead of IRQ number. |
| 594 | * "count" can not decrease. |
| 595 | * "map" size must be equal to "count". |
| 596 | * If "count" struct intrsource cannot be allocated, return non-zero value. |
| 597 | * e.g. |
| 598 | * If "map" = { 1, 4, 0 }, |
| 599 | * 1st handle is bound to MSI-X index 1 |
| 600 | * 2nd handle is bound to MSI-X index 4 |
| 601 | * 3rd handle is bound to MSI-X index 0 |
| 602 | */ |
| 603 | int |
| 604 | pci_msix_alloc_map(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, |
| 605 | u_int *table_indexes, int count) |
| 606 | { |
| 607 | int hw_max, i, j; |
| 608 | |
| 609 | KASSERT(count > 0); |
| 610 | |
| 611 | hw_max = pci_msix_count(pa->pa_pc, pa->pa_tag); |
| 612 | if (hw_max == 0) |
| 613 | return ENODEV; |
| 614 | |
| 615 | if (count > hw_max) { |
| 616 | DPRINTF(("over hardware max MSI-X count %d\n" , hw_max)); |
| 617 | return EINVAL; |
| 618 | } |
| 619 | |
| 620 | /* check not to duplicate table_index */ |
| 621 | for (i = 0; i < count; i++) { |
| 622 | u_int basing = table_indexes[i]; |
| 623 | |
| 624 | KASSERT(table_indexes[i] < PCI_MSIX_MAX_VECTORS); |
| 625 | if (basing >= hw_max) { |
| 626 | DPRINTF(("table index is over hardware max MSI-X index %d\n" , |
| 627 | hw_max - 1)); |
| 628 | return EINVAL; |
| 629 | } |
| 630 | |
| 631 | for (j = i + 1; j < count; j++) { |
| 632 | if (basing == table_indexes[j]) { |
| 633 | DPRINTF(("MSI-X table index duplicated\n" )); |
| 634 | return EINVAL; |
| 635 | } |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | return x86_pci_msix_alloc_map(ihps, table_indexes, count, pa); |
| 640 | } |
| 641 | |