1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2016,2017 IBM Corporation. 4 */ 5 6 #define pr_fmt(fmt) "xive: " fmt 7 8 #include <linux/types.h> 9 #include <linux/irq.h> 10 #include <linux/smp.h> 11 #include <linux/interrupt.h> 12 #include <linux/init.h> 13 #include <linux/of.h> 14 #include <linux/of_address.h> 15 #include <linux/of_fdt.h> 16 #include <linux/slab.h> 17 #include <linux/spinlock.h> 18 #include <linux/bitmap.h> 19 #include <linux/cpumask.h> 20 #include <linux/mm.h> 21 #include <linux/delay.h> 22 #include <linux/libfdt.h> 23 24 #include <asm/machdep.h> 25 #include <asm/prom.h> 26 #include <asm/io.h> 27 #include <asm/smp.h> 28 #include <asm/irq.h> 29 #include <asm/errno.h> 30 #include <asm/xive.h> 31 #include <asm/xive-regs.h> 32 #include <asm/hvcall.h> 33 #include <asm/svm.h> 34 #include <asm/ultravisor.h> 35 36 #include "xive-internal.h" 37 38 static u32 xive_queue_shift; 39 40 struct xive_irq_bitmap { 41 unsigned long *bitmap; 42 unsigned int base; 43 unsigned int count; 44 spinlock_t lock; 45 struct list_head list; 46 }; 47 48 static LIST_HEAD(xive_irq_bitmaps); 49 50 static int __init xive_irq_bitmap_add(int base, int count) 51 { 52 struct xive_irq_bitmap *xibm; 53 54 xibm = kzalloc(sizeof(*xibm), GFP_KERNEL); 55 if (!xibm) 56 return -ENOMEM; 57 58 spin_lock_init(&xibm->lock); 59 xibm->base = base; 60 xibm->count = count; 61 xibm->bitmap = bitmap_zalloc(xibm->count, GFP_KERNEL); 62 if (!xibm->bitmap) { 63 kfree(xibm); 64 return -ENOMEM; 65 } 66 list_add(&xibm->list, &xive_irq_bitmaps); 67 68 pr_info("Using IRQ range [%x-%x]", xibm->base, 69 xibm->base + xibm->count - 1); 70 return 0; 71 } 72 73 static void xive_irq_bitmap_remove_all(void) 74 { 75 struct xive_irq_bitmap *xibm, *tmp; 76 77 list_for_each_entry_safe(xibm, tmp, &xive_irq_bitmaps, list) { 78 list_del(&xibm->list); 79 bitmap_free(xibm->bitmap); 80 kfree(xibm); 81 } 82 } 83 84 static int __xive_irq_bitmap_alloc(struct xive_irq_bitmap *xibm) 85 { 86 int irq; 87 88 irq = find_first_zero_bit(xibm->bitmap, xibm->count); 89 if (irq != xibm->count) { 90 set_bit(irq, xibm->bitmap); 91 irq += xibm->base; 92 } else { 93 irq = -ENOMEM; 94 } 95 96 return irq; 97 } 98 99 static int xive_irq_bitmap_alloc(void) 100 { 101 struct xive_irq_bitmap *xibm; 102 unsigned long flags; 103 int irq = -ENOENT; 104 105 list_for_each_entry(xibm, &xive_irq_bitmaps, list) { 106 spin_lock_irqsave(&xibm->lock, flags); 107 irq = __xive_irq_bitmap_alloc(xibm); 108 spin_unlock_irqrestore(&xibm->lock, flags); 109 if (irq >= 0) 110 break; 111 } 112 return irq; 113 } 114 115 static void xive_irq_bitmap_free(int irq) 116 { 117 unsigned long flags; 118 struct xive_irq_bitmap *xibm; 119 120 list_for_each_entry(xibm, &xive_irq_bitmaps, list) { 121 if ((irq >= xibm->base) && (irq < xibm->base + xibm->count)) { 122 spin_lock_irqsave(&xibm->lock, flags); 123 clear_bit(irq - xibm->base, xibm->bitmap); 124 spin_unlock_irqrestore(&xibm->lock, flags); 125 break; 126 } 127 } 128 } 129 130 131 /* Based on the similar routines in RTAS */ 132 static unsigned int plpar_busy_delay_time(long rc) 133 { 134 unsigned int ms = 0; 135 136 if (H_IS_LONG_BUSY(rc)) { 137 ms = get_longbusy_msecs(rc); 138 } else if (rc == H_BUSY) { 139 ms = 10; /* seems appropriate for XIVE hcalls */ 140 } 141 142 return ms; 143 } 144 145 static unsigned int plpar_busy_delay(int rc) 146 { 147 unsigned int ms; 148 149 ms = plpar_busy_delay_time(rc); 150 if (ms) 151 mdelay(ms); 152 153 return ms; 154 } 155 156 /* 157 * Note: this call has a partition wide scope and can take a while to 158 * complete. If it returns H_LONG_BUSY_* it should be retried 159 * periodically. 160 */ 161 static long plpar_int_reset(unsigned long flags) 162 { 163 long rc; 164 165 do { 166 rc = plpar_hcall_norets(H_INT_RESET, flags); 167 } while (plpar_busy_delay(rc)); 168 169 if (rc) 170 pr_err("H_INT_RESET failed %ld\n", rc); 171 172 return rc; 173 } 174 175 static long plpar_int_get_source_info(unsigned long flags, 176 unsigned long lisn, 177 unsigned long *src_flags, 178 unsigned long *eoi_page, 179 unsigned long *trig_page, 180 unsigned long *esb_shift) 181 { 182 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 183 long rc; 184 185 do { 186 rc = plpar_hcall(H_INT_GET_SOURCE_INFO, retbuf, flags, lisn); 187 } while (plpar_busy_delay(rc)); 188 189 if (rc) { 190 pr_err("H_INT_GET_SOURCE_INFO lisn=0x%lx failed %ld\n", lisn, rc); 191 return rc; 192 } 193 194 *src_flags = retbuf[0]; 195 *eoi_page = retbuf[1]; 196 *trig_page = retbuf[2]; 197 *esb_shift = retbuf[3]; 198 199 pr_debug("H_INT_GET_SOURCE_INFO lisn=0x%lx flags=0x%lx eoi=0x%lx trig=0x%lx shift=0x%lx\n", 200 lisn, retbuf[0], retbuf[1], retbuf[2], retbuf[3]); 201 202 return 0; 203 } 204 205 #define XIVE_SRC_SET_EISN (1ull << (63 - 62)) 206 #define XIVE_SRC_MASK (1ull << (63 - 63)) /* unused */ 207 208 static long plpar_int_set_source_config(unsigned long flags, 209 unsigned long lisn, 210 unsigned long target, 211 unsigned long prio, 212 unsigned long sw_irq) 213 { 214 long rc; 215 216 217 pr_debug("H_INT_SET_SOURCE_CONFIG flags=0x%lx lisn=0x%lx target=%ld prio=%ld sw_irq=%ld\n", 218 flags, lisn, target, prio, sw_irq); 219 220 221 do { 222 rc = plpar_hcall_norets(H_INT_SET_SOURCE_CONFIG, flags, lisn, 223 target, prio, sw_irq); 224 } while (plpar_busy_delay(rc)); 225 226 if (rc) { 227 pr_err("H_INT_SET_SOURCE_CONFIG lisn=0x%lx target=%ld prio=%ld failed %ld\n", 228 lisn, target, prio, rc); 229 return rc; 230 } 231 232 return 0; 233 } 234 235 static long plpar_int_get_source_config(unsigned long flags, 236 unsigned long lisn, 237 unsigned long *target, 238 unsigned long *prio, 239 unsigned long *sw_irq) 240 { 241 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 242 long rc; 243 244 pr_debug("H_INT_GET_SOURCE_CONFIG flags=0x%lx lisn=0x%lx\n", flags, lisn); 245 246 do { 247 rc = plpar_hcall(H_INT_GET_SOURCE_CONFIG, retbuf, flags, lisn, 248 target, prio, sw_irq); 249 } while (plpar_busy_delay(rc)); 250 251 if (rc) { 252 pr_err("H_INT_GET_SOURCE_CONFIG lisn=0x%lx failed %ld\n", 253 lisn, rc); 254 return rc; 255 } 256 257 *target = retbuf[0]; 258 *prio = retbuf[1]; 259 *sw_irq = retbuf[2]; 260 261 pr_debug("H_INT_GET_SOURCE_CONFIG target=%ld prio=%ld sw_irq=%ld\n", 262 retbuf[0], retbuf[1], retbuf[2]); 263 264 return 0; 265 } 266 267 static long plpar_int_get_queue_info(unsigned long flags, 268 unsigned long target, 269 unsigned long priority, 270 unsigned long *esn_page, 271 unsigned long *esn_size) 272 { 273 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 274 long rc; 275 276 do { 277 rc = plpar_hcall(H_INT_GET_QUEUE_INFO, retbuf, flags, target, 278 priority); 279 } while (plpar_busy_delay(rc)); 280 281 if (rc) { 282 pr_err("H_INT_GET_QUEUE_INFO cpu=%ld prio=%ld failed %ld\n", 283 target, priority, rc); 284 return rc; 285 } 286 287 *esn_page = retbuf[0]; 288 *esn_size = retbuf[1]; 289 290 pr_debug("H_INT_GET_QUEUE_INFO cpu=%ld prio=%ld page=0x%lx size=0x%lx\n", 291 target, priority, retbuf[0], retbuf[1]); 292 293 return 0; 294 } 295 296 #define XIVE_EQ_ALWAYS_NOTIFY (1ull << (63 - 63)) 297 298 static long plpar_int_set_queue_config(unsigned long flags, 299 unsigned long target, 300 unsigned long priority, 301 unsigned long qpage, 302 unsigned long qsize) 303 { 304 long rc; 305 306 pr_debug("H_INT_SET_QUEUE_CONFIG flags=0x%lx target=%ld priority=0x%lx qpage=0x%lx qsize=0x%lx\n", 307 flags, target, priority, qpage, qsize); 308 309 do { 310 rc = plpar_hcall_norets(H_INT_SET_QUEUE_CONFIG, flags, target, 311 priority, qpage, qsize); 312 } while (plpar_busy_delay(rc)); 313 314 if (rc) { 315 pr_err("H_INT_SET_QUEUE_CONFIG cpu=%ld prio=%ld qpage=0x%lx returned %ld\n", 316 target, priority, qpage, rc); 317 return rc; 318 } 319 320 return 0; 321 } 322 323 static long plpar_int_sync(unsigned long flags, unsigned long lisn) 324 { 325 long rc; 326 327 do { 328 rc = plpar_hcall_norets(H_INT_SYNC, flags, lisn); 329 } while (plpar_busy_delay(rc)); 330 331 if (rc) { 332 pr_err("H_INT_SYNC lisn=0x%lx returned %ld\n", lisn, rc); 333 return rc; 334 } 335 336 return 0; 337 } 338 339 #define XIVE_ESB_FLAG_STORE (1ull << (63 - 63)) 340 341 static long plpar_int_esb(unsigned long flags, 342 unsigned long lisn, 343 unsigned long offset, 344 unsigned long in_data, 345 unsigned long *out_data) 346 { 347 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 348 long rc; 349 350 pr_debug("H_INT_ESB flags=0x%lx lisn=0x%lx offset=0x%lx in=0x%lx\n", 351 flags, lisn, offset, in_data); 352 353 do { 354 rc = plpar_hcall(H_INT_ESB, retbuf, flags, lisn, offset, 355 in_data); 356 } while (plpar_busy_delay(rc)); 357 358 if (rc) { 359 pr_err("H_INT_ESB lisn=0x%lx offset=0x%lx returned %ld\n", 360 lisn, offset, rc); 361 return rc; 362 } 363 364 *out_data = retbuf[0]; 365 366 return 0; 367 } 368 369 static u64 xive_spapr_esb_rw(u32 lisn, u32 offset, u64 data, bool write) 370 { 371 unsigned long read_data; 372 long rc; 373 374 rc = plpar_int_esb(write ? XIVE_ESB_FLAG_STORE : 0, 375 lisn, offset, data, &read_data); 376 if (rc) 377 return -1; 378 379 return write ? 0 : read_data; 380 } 381 382 #define XIVE_SRC_H_INT_ESB (1ull << (63 - 60)) 383 #define XIVE_SRC_LSI (1ull << (63 - 61)) 384 #define XIVE_SRC_TRIGGER (1ull << (63 - 62)) 385 #define XIVE_SRC_STORE_EOI (1ull << (63 - 63)) 386 387 static int xive_spapr_populate_irq_data(u32 hw_irq, struct xive_irq_data *data) 388 { 389 long rc; 390 unsigned long flags; 391 unsigned long eoi_page; 392 unsigned long trig_page; 393 unsigned long esb_shift; 394 395 memset(data, 0, sizeof(*data)); 396 397 rc = plpar_int_get_source_info(0, hw_irq, &flags, &eoi_page, &trig_page, 398 &esb_shift); 399 if (rc) 400 return -EINVAL; 401 402 if (flags & XIVE_SRC_H_INT_ESB) 403 data->flags |= XIVE_IRQ_FLAG_H_INT_ESB; 404 if (flags & XIVE_SRC_STORE_EOI) 405 data->flags |= XIVE_IRQ_FLAG_STORE_EOI; 406 if (flags & XIVE_SRC_LSI) 407 data->flags |= XIVE_IRQ_FLAG_LSI; 408 data->eoi_page = eoi_page; 409 data->esb_shift = esb_shift; 410 data->trig_page = trig_page; 411 412 data->hw_irq = hw_irq; 413 414 /* 415 * No chip-id for the sPAPR backend. This has an impact how we 416 * pick a target. See xive_pick_irq_target(). 417 */ 418 data->src_chip = XIVE_INVALID_CHIP_ID; 419 420 /* 421 * When the H_INT_ESB flag is set, the H_INT_ESB hcall should 422 * be used for interrupt management. Skip the remapping of the 423 * ESB pages which are not available. 424 */ 425 if (data->flags & XIVE_IRQ_FLAG_H_INT_ESB) 426 return 0; 427 428 data->eoi_mmio = ioremap(data->eoi_page, 1u << data->esb_shift); 429 if (!data->eoi_mmio) { 430 pr_err("Failed to map EOI page for irq 0x%x\n", hw_irq); 431 return -ENOMEM; 432 } 433 434 /* Full function page supports trigger */ 435 if (flags & XIVE_SRC_TRIGGER) { 436 data->trig_mmio = data->eoi_mmio; 437 return 0; 438 } 439 440 data->trig_mmio = ioremap(data->trig_page, 1u << data->esb_shift); 441 if (!data->trig_mmio) { 442 iounmap(data->eoi_mmio); 443 pr_err("Failed to map trigger page for irq 0x%x\n", hw_irq); 444 return -ENOMEM; 445 } 446 return 0; 447 } 448 449 static int xive_spapr_configure_irq(u32 hw_irq, u32 target, u8 prio, u32 sw_irq) 450 { 451 long rc; 452 453 rc = plpar_int_set_source_config(XIVE_SRC_SET_EISN, hw_irq, target, 454 prio, sw_irq); 455 456 return rc == 0 ? 0 : -ENXIO; 457 } 458 459 static int xive_spapr_get_irq_config(u32 hw_irq, u32 *target, u8 *prio, 460 u32 *sw_irq) 461 { 462 long rc; 463 unsigned long h_target; 464 unsigned long h_prio; 465 unsigned long h_sw_irq; 466 467 rc = plpar_int_get_source_config(0, hw_irq, &h_target, &h_prio, 468 &h_sw_irq); 469 470 *target = h_target; 471 *prio = h_prio; 472 *sw_irq = h_sw_irq; 473 474 return rc == 0 ? 0 : -ENXIO; 475 } 476 477 /* This can be called multiple time to change a queue configuration */ 478 static int xive_spapr_configure_queue(u32 target, struct xive_q *q, u8 prio, 479 __be32 *qpage, u32 order) 480 { 481 s64 rc = 0; 482 unsigned long esn_page; 483 unsigned long esn_size; 484 u64 flags, qpage_phys; 485 486 /* If there's an actual queue page, clean it */ 487 if (order) { 488 if (WARN_ON(!qpage)) 489 return -EINVAL; 490 qpage_phys = __pa(qpage); 491 } else { 492 qpage_phys = 0; 493 } 494 495 /* Initialize the rest of the fields */ 496 q->msk = order ? ((1u << (order - 2)) - 1) : 0; 497 q->idx = 0; 498 q->toggle = 0; 499 500 rc = plpar_int_get_queue_info(0, target, prio, &esn_page, &esn_size); 501 if (rc) { 502 pr_err("Error %lld getting queue info CPU %d prio %d\n", rc, 503 target, prio); 504 rc = -EIO; 505 goto fail; 506 } 507 508 /* TODO: add support for the notification page */ 509 q->eoi_phys = esn_page; 510 511 /* Default is to always notify */ 512 flags = XIVE_EQ_ALWAYS_NOTIFY; 513 514 /* Configure and enable the queue in HW */ 515 rc = plpar_int_set_queue_config(flags, target, prio, qpage_phys, order); 516 if (rc) { 517 pr_err("Error %lld setting queue for CPU %d prio %d\n", rc, 518 target, prio); 519 rc = -EIO; 520 } else { 521 q->qpage = qpage; 522 if (is_secure_guest()) 523 uv_share_page(PHYS_PFN(qpage_phys), 524 1 << xive_alloc_order(order)); 525 } 526 fail: 527 return rc; 528 } 529 530 static int xive_spapr_setup_queue(unsigned int cpu, struct xive_cpu *xc, 531 u8 prio) 532 { 533 struct xive_q *q = &xc->queue[prio]; 534 __be32 *qpage; 535 536 qpage = xive_queue_page_alloc(cpu, xive_queue_shift); 537 if (IS_ERR(qpage)) 538 return PTR_ERR(qpage); 539 540 return xive_spapr_configure_queue(get_hard_smp_processor_id(cpu), 541 q, prio, qpage, xive_queue_shift); 542 } 543 544 static void xive_spapr_cleanup_queue(unsigned int cpu, struct xive_cpu *xc, 545 u8 prio) 546 { 547 struct xive_q *q = &xc->queue[prio]; 548 unsigned int alloc_order; 549 long rc; 550 int hw_cpu = get_hard_smp_processor_id(cpu); 551 552 rc = plpar_int_set_queue_config(0, hw_cpu, prio, 0, 0); 553 if (rc) 554 pr_err("Error %ld setting queue for CPU %d prio %d\n", rc, 555 hw_cpu, prio); 556 557 alloc_order = xive_alloc_order(xive_queue_shift); 558 if (is_secure_guest()) 559 uv_unshare_page(PHYS_PFN(__pa(q->qpage)), 1 << alloc_order); 560 free_pages((unsigned long)q->qpage, alloc_order); 561 q->qpage = NULL; 562 } 563 564 static bool xive_spapr_match(struct device_node *node) 565 { 566 /* Ignore cascaded controllers for the moment */ 567 return true; 568 } 569 570 #ifdef CONFIG_SMP 571 static int xive_spapr_get_ipi(unsigned int cpu, struct xive_cpu *xc) 572 { 573 int irq = xive_irq_bitmap_alloc(); 574 575 if (irq < 0) { 576 pr_err("Failed to allocate IPI on CPU %d\n", cpu); 577 return -ENXIO; 578 } 579 580 xc->hw_ipi = irq; 581 return 0; 582 } 583 584 static void xive_spapr_put_ipi(unsigned int cpu, struct xive_cpu *xc) 585 { 586 if (xc->hw_ipi == XIVE_BAD_IRQ) 587 return; 588 589 xive_irq_bitmap_free(xc->hw_ipi); 590 xc->hw_ipi = XIVE_BAD_IRQ; 591 } 592 #endif /* CONFIG_SMP */ 593 594 static void xive_spapr_shutdown(void) 595 { 596 plpar_int_reset(0); 597 } 598 599 /* 600 * Perform an "ack" cycle on the current thread. Grab the pending 601 * active priorities and update the CPPR to the most favored one. 602 */ 603 static void xive_spapr_update_pending(struct xive_cpu *xc) 604 { 605 u8 nsr, cppr; 606 u16 ack; 607 608 /* 609 * Perform the "Acknowledge O/S to Register" cycle. 610 * 611 * Let's speedup the access to the TIMA using the raw I/O 612 * accessor as we don't need the synchronisation routine of 613 * the higher level ones 614 */ 615 ack = be16_to_cpu(__raw_readw(xive_tima + TM_SPC_ACK_OS_REG)); 616 617 /* Synchronize subsequent queue accesses */ 618 mb(); 619 620 /* 621 * Grab the CPPR and the "NSR" field which indicates the source 622 * of the interrupt (if any) 623 */ 624 cppr = ack & 0xff; 625 nsr = ack >> 8; 626 627 if (nsr & TM_QW1_NSR_EO) { 628 if (cppr == 0xff) 629 return; 630 /* Mark the priority pending */ 631 xc->pending_prio |= 1 << cppr; 632 633 /* 634 * A new interrupt should never have a CPPR less favored 635 * than our current one. 636 */ 637 if (cppr >= xc->cppr) 638 pr_err("CPU %d odd ack CPPR, got %d at %d\n", 639 smp_processor_id(), cppr, xc->cppr); 640 641 /* Update our idea of what the CPPR is */ 642 xc->cppr = cppr; 643 } 644 } 645 646 static void xive_spapr_setup_cpu(unsigned int cpu, struct xive_cpu *xc) 647 { 648 /* Only some debug on the TIMA settings */ 649 pr_debug("(HW value: %08x %08x %08x)\n", 650 in_be32(xive_tima + TM_QW1_OS + TM_WORD0), 651 in_be32(xive_tima + TM_QW1_OS + TM_WORD1), 652 in_be32(xive_tima + TM_QW1_OS + TM_WORD2)); 653 } 654 655 static void xive_spapr_teardown_cpu(unsigned int cpu, struct xive_cpu *xc) 656 { 657 /* Nothing to do */; 658 } 659 660 static void xive_spapr_sync_source(u32 hw_irq) 661 { 662 /* Specs are unclear on what this is doing */ 663 plpar_int_sync(0, hw_irq); 664 } 665 666 static int xive_spapr_debug_show(struct seq_file *m, void *private) 667 { 668 struct xive_irq_bitmap *xibm; 669 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 670 671 if (!buf) 672 return -ENOMEM; 673 674 list_for_each_entry(xibm, &xive_irq_bitmaps, list) { 675 memset(buf, 0, PAGE_SIZE); 676 bitmap_print_to_pagebuf(true, buf, xibm->bitmap, xibm->count); 677 seq_printf(m, "bitmap #%d: %s", xibm->count, buf); 678 } 679 kfree(buf); 680 681 return 0; 682 } 683 684 static const struct xive_ops xive_spapr_ops = { 685 .populate_irq_data = xive_spapr_populate_irq_data, 686 .configure_irq = xive_spapr_configure_irq, 687 .get_irq_config = xive_spapr_get_irq_config, 688 .setup_queue = xive_spapr_setup_queue, 689 .cleanup_queue = xive_spapr_cleanup_queue, 690 .match = xive_spapr_match, 691 .shutdown = xive_spapr_shutdown, 692 .update_pending = xive_spapr_update_pending, 693 .setup_cpu = xive_spapr_setup_cpu, 694 .teardown_cpu = xive_spapr_teardown_cpu, 695 .sync_source = xive_spapr_sync_source, 696 .esb_rw = xive_spapr_esb_rw, 697 #ifdef CONFIG_SMP 698 .get_ipi = xive_spapr_get_ipi, 699 .put_ipi = xive_spapr_put_ipi, 700 .debug_show = xive_spapr_debug_show, 701 #endif /* CONFIG_SMP */ 702 .name = "spapr", 703 }; 704 705 /* 706 * get max priority from "/ibm,plat-res-int-priorities" 707 */ 708 static bool __init xive_get_max_prio(u8 *max_prio) 709 { 710 struct device_node *rootdn; 711 const __be32 *reg; 712 u32 len; 713 int prio, found; 714 715 rootdn = of_find_node_by_path("/"); 716 if (!rootdn) { 717 pr_err("not root node found !\n"); 718 return false; 719 } 720 721 reg = of_get_property(rootdn, "ibm,plat-res-int-priorities", &len); 722 of_node_put(rootdn); 723 if (!reg) { 724 pr_err("Failed to read 'ibm,plat-res-int-priorities' property\n"); 725 return false; 726 } 727 728 if (len % (2 * sizeof(u32)) != 0) { 729 pr_err("invalid 'ibm,plat-res-int-priorities' property\n"); 730 return false; 731 } 732 733 /* HW supports priorities in the range [0-7] and 0xFF is a 734 * wildcard priority used to mask. We scan the ranges reserved 735 * by the hypervisor to find the lowest priority we can use. 736 */ 737 found = 0xFF; 738 for (prio = 0; prio < 8; prio++) { 739 int reserved = 0; 740 int i; 741 742 for (i = 0; i < len / (2 * sizeof(u32)); i++) { 743 int base = be32_to_cpu(reg[2 * i]); 744 int range = be32_to_cpu(reg[2 * i + 1]); 745 746 if (prio >= base && prio < base + range) 747 reserved++; 748 } 749 750 if (!reserved) 751 found = prio; 752 } 753 754 if (found == 0xFF) { 755 pr_err("no valid priority found in 'ibm,plat-res-int-priorities'\n"); 756 return false; 757 } 758 759 *max_prio = found; 760 return true; 761 } 762 763 static const u8 *__init get_vec5_feature(unsigned int index) 764 { 765 unsigned long root, chosen; 766 int size; 767 const u8 *vec5; 768 769 root = of_get_flat_dt_root(); 770 chosen = of_get_flat_dt_subnode_by_name(root, "chosen"); 771 if (chosen == -FDT_ERR_NOTFOUND) 772 return NULL; 773 774 vec5 = of_get_flat_dt_prop(chosen, "ibm,architecture-vec-5", &size); 775 if (!vec5) 776 return NULL; 777 778 if (size <= index) 779 return NULL; 780 781 return vec5 + index; 782 } 783 784 static bool __init xive_spapr_disabled(void) 785 { 786 const u8 *vec5_xive; 787 788 vec5_xive = get_vec5_feature(OV5_INDX(OV5_XIVE_SUPPORT)); 789 if (vec5_xive) { 790 u8 val; 791 792 val = *vec5_xive & OV5_FEAT(OV5_XIVE_SUPPORT); 793 switch (val) { 794 case OV5_FEAT(OV5_XIVE_EITHER): 795 case OV5_FEAT(OV5_XIVE_LEGACY): 796 break; 797 case OV5_FEAT(OV5_XIVE_EXPLOIT): 798 /* Hypervisor only supports XIVE */ 799 if (xive_cmdline_disabled) 800 pr_warn("WARNING: Ignoring cmdline option xive=off\n"); 801 return false; 802 default: 803 pr_warn("%s: Unknown xive support option: 0x%x\n", 804 __func__, val); 805 break; 806 } 807 } 808 809 return xive_cmdline_disabled; 810 } 811 812 bool __init xive_spapr_init(void) 813 { 814 struct device_node *np; 815 struct resource r; 816 void __iomem *tima; 817 struct property *prop; 818 u8 max_prio; 819 u32 val; 820 u32 len; 821 const __be32 *reg; 822 int i, err; 823 824 if (xive_spapr_disabled()) 825 return false; 826 827 pr_devel("%s()\n", __func__); 828 np = of_find_compatible_node(NULL, NULL, "ibm,power-ivpe"); 829 if (!np) { 830 pr_devel("not found !\n"); 831 return false; 832 } 833 pr_devel("Found %s\n", np->full_name); 834 835 /* Resource 1 is the OS ring TIMA */ 836 if (of_address_to_resource(np, 1, &r)) { 837 pr_err("Failed to get thread mgmnt area resource\n"); 838 goto err_put; 839 } 840 tima = ioremap(r.start, resource_size(&r)); 841 if (!tima) { 842 pr_err("Failed to map thread mgmnt area\n"); 843 goto err_put; 844 } 845 846 if (!xive_get_max_prio(&max_prio)) 847 goto err_unmap; 848 849 /* Feed the IRQ number allocator with the ranges given in the DT */ 850 reg = of_get_property(np, "ibm,xive-lisn-ranges", &len); 851 if (!reg) { 852 pr_err("Failed to read 'ibm,xive-lisn-ranges' property\n"); 853 goto err_unmap; 854 } 855 856 if (len % (2 * sizeof(u32)) != 0) { 857 pr_err("invalid 'ibm,xive-lisn-ranges' property\n"); 858 goto err_unmap; 859 } 860 861 for (i = 0; i < len / (2 * sizeof(u32)); i++, reg += 2) { 862 err = xive_irq_bitmap_add(be32_to_cpu(reg[0]), 863 be32_to_cpu(reg[1])); 864 if (err < 0) 865 goto err_mem_free; 866 } 867 868 /* Iterate the EQ sizes and pick one */ 869 of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, reg, val) { 870 xive_queue_shift = val; 871 if (val == PAGE_SHIFT) 872 break; 873 } 874 875 /* Initialize XIVE core with our backend */ 876 if (!xive_core_init(np, &xive_spapr_ops, tima, TM_QW1_OS, max_prio)) 877 goto err_mem_free; 878 879 of_node_put(np); 880 pr_info("Using %dkB queues\n", 1 << (xive_queue_shift - 10)); 881 return true; 882 883 err_mem_free: 884 xive_irq_bitmap_remove_all(); 885 err_unmap: 886 iounmap(tima); 887 err_put: 888 of_node_put(np); 889 return false; 890 } 891 892 machine_arch_initcall(pseries, xive_core_debug_init); 893