1 /* 2 * SN Platform GRU Driver 3 * 4 * FILE OPERATIONS & DRIVER INITIALIZATION 5 * 6 * This file supports the user system call for file open, close, mmap, etc. 7 * This also incudes the driver initialization code. 8 * 9 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 */ 25 26 #include <linux/module.h> 27 #include <linux/kernel.h> 28 #include <linux/errno.h> 29 #include <linux/slab.h> 30 #include <linux/mm.h> 31 #include <linux/io.h> 32 #include <linux/spinlock.h> 33 #include <linux/device.h> 34 #include <linux/miscdevice.h> 35 #include <linux/interrupt.h> 36 #include <linux/proc_fs.h> 37 #include <linux/uaccess.h> 38 #ifdef CONFIG_X86_64 39 #include <asm/uv/uv_irq.h> 40 #endif 41 #include <asm/uv/uv.h> 42 #include "gru.h" 43 #include "grulib.h" 44 #include "grutables.h" 45 46 #include <asm/uv/uv_hub.h> 47 #include <asm/uv/uv_mmrs.h> 48 49 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly; 50 unsigned long gru_start_paddr __read_mostly; 51 void *gru_start_vaddr __read_mostly; 52 unsigned long gru_end_paddr __read_mostly; 53 unsigned int gru_max_gids __read_mostly; 54 struct gru_stats_s gru_stats; 55 56 /* Guaranteed user available resources on each node */ 57 static int max_user_cbrs, max_user_dsr_bytes; 58 59 static struct miscdevice gru_miscdev; 60 61 62 /* 63 * gru_vma_close 64 * 65 * Called when unmapping a device mapping. Frees all gru resources 66 * and tables belonging to the vma. 67 */ 68 static void gru_vma_close(struct vm_area_struct *vma) 69 { 70 struct gru_vma_data *vdata; 71 struct gru_thread_state *gts; 72 struct list_head *entry, *next; 73 74 if (!vma->vm_private_data) 75 return; 76 77 vdata = vma->vm_private_data; 78 vma->vm_private_data = NULL; 79 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file, 80 vdata); 81 list_for_each_safe(entry, next, &vdata->vd_head) { 82 gts = 83 list_entry(entry, struct gru_thread_state, ts_next); 84 list_del(>s->ts_next); 85 mutex_lock(>s->ts_ctxlock); 86 if (gts->ts_gru) 87 gru_unload_context(gts, 0); 88 mutex_unlock(>s->ts_ctxlock); 89 gts_drop(gts); 90 } 91 kfree(vdata); 92 STAT(vdata_free); 93 } 94 95 /* 96 * gru_file_mmap 97 * 98 * Called when mmapping the device. Initializes the vma with a fault handler 99 * and private data structure necessary to allocate, track, and free the 100 * underlying pages. 101 */ 102 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma) 103 { 104 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE)) 105 return -EPERM; 106 107 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) || 108 vma->vm_end & (GRU_GSEG_PAGESIZE - 1)) 109 return -EINVAL; 110 111 vma->vm_flags |= VM_IO | VM_PFNMAP | VM_LOCKED | 112 VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP; 113 vma->vm_page_prot = PAGE_SHARED; 114 vma->vm_ops = &gru_vm_ops; 115 116 vma->vm_private_data = gru_alloc_vma_data(vma, 0); 117 if (!vma->vm_private_data) 118 return -ENOMEM; 119 120 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n", 121 file, vma->vm_start, vma, vma->vm_private_data); 122 return 0; 123 } 124 125 /* 126 * Create a new GRU context 127 */ 128 static int gru_create_new_context(unsigned long arg) 129 { 130 struct gru_create_context_req req; 131 struct vm_area_struct *vma; 132 struct gru_vma_data *vdata; 133 int ret = -EINVAL; 134 135 if (copy_from_user(&req, (void __user *)arg, sizeof(req))) 136 return -EFAULT; 137 138 if (req.data_segment_bytes > max_user_dsr_bytes) 139 return -EINVAL; 140 if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count) 141 return -EINVAL; 142 143 if (!(req.options & GRU_OPT_MISS_MASK)) 144 req.options |= GRU_OPT_MISS_FMM_INTR; 145 146 down_write(¤t->mm->mmap_sem); 147 vma = gru_find_vma(req.gseg); 148 if (vma) { 149 vdata = vma->vm_private_data; 150 vdata->vd_user_options = req.options; 151 vdata->vd_dsr_au_count = 152 GRU_DS_BYTES_TO_AU(req.data_segment_bytes); 153 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks); 154 vdata->vd_tlb_preload_count = req.tlb_preload_count; 155 ret = 0; 156 } 157 up_write(¤t->mm->mmap_sem); 158 159 return ret; 160 } 161 162 /* 163 * Get GRU configuration info (temp - for emulator testing) 164 */ 165 static long gru_get_config_info(unsigned long arg) 166 { 167 struct gru_config_info info; 168 int nodesperblade; 169 170 if (num_online_nodes() > 1 && 171 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0))) 172 nodesperblade = 2; 173 else 174 nodesperblade = 1; 175 memset(&info, 0, sizeof(info)); 176 info.cpus = num_online_cpus(); 177 info.nodes = num_online_nodes(); 178 info.blades = info.nodes / nodesperblade; 179 info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades; 180 181 if (copy_to_user((void __user *)arg, &info, sizeof(info))) 182 return -EFAULT; 183 return 0; 184 } 185 186 /* 187 * gru_file_unlocked_ioctl 188 * 189 * Called to update file attributes via IOCTL calls. 190 */ 191 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req, 192 unsigned long arg) 193 { 194 int err = -EBADRQC; 195 196 gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg); 197 198 switch (req) { 199 case GRU_CREATE_CONTEXT: 200 err = gru_create_new_context(arg); 201 break; 202 case GRU_SET_CONTEXT_OPTION: 203 err = gru_set_context_option(arg); 204 break; 205 case GRU_USER_GET_EXCEPTION_DETAIL: 206 err = gru_get_exception_detail(arg); 207 break; 208 case GRU_USER_UNLOAD_CONTEXT: 209 err = gru_user_unload_context(arg); 210 break; 211 case GRU_USER_FLUSH_TLB: 212 err = gru_user_flush_tlb(arg); 213 break; 214 case GRU_USER_CALL_OS: 215 err = gru_handle_user_call_os(arg); 216 break; 217 case GRU_GET_GSEG_STATISTICS: 218 err = gru_get_gseg_statistics(arg); 219 break; 220 case GRU_KTEST: 221 err = gru_ktest(arg); 222 break; 223 case GRU_GET_CONFIG_INFO: 224 err = gru_get_config_info(arg); 225 break; 226 case GRU_DUMP_CHIPLET_STATE: 227 err = gru_dump_chiplet_request(arg); 228 break; 229 } 230 return err; 231 } 232 233 /* 234 * Called at init time to build tables for all GRUs that are present in the 235 * system. 236 */ 237 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, 238 void *vaddr, int blade_id, int chiplet_id) 239 { 240 spin_lock_init(&gru->gs_lock); 241 spin_lock_init(&gru->gs_asid_lock); 242 gru->gs_gru_base_paddr = paddr; 243 gru->gs_gru_base_vaddr = vaddr; 244 gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id; 245 gru->gs_blade = gru_base[blade_id]; 246 gru->gs_blade_id = blade_id; 247 gru->gs_chiplet_id = chiplet_id; 248 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; 249 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; 250 gru->gs_asid_limit = MAX_ASID; 251 gru_tgh_flush_init(gru); 252 if (gru->gs_gid >= gru_max_gids) 253 gru_max_gids = gru->gs_gid + 1; 254 gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n", 255 blade_id, gru->gs_gid, gru->gs_gru_base_vaddr, 256 gru->gs_gru_base_paddr); 257 } 258 259 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr) 260 { 261 int pnode, nid, bid, chip; 262 int cbrs, dsrbytes, n; 263 int order = get_order(sizeof(struct gru_blade_state)); 264 struct page *page; 265 struct gru_state *gru; 266 unsigned long paddr; 267 void *vaddr; 268 269 max_user_cbrs = GRU_NUM_CB; 270 max_user_dsr_bytes = GRU_NUM_DSR_BYTES; 271 for_each_possible_blade(bid) { 272 pnode = uv_blade_to_pnode(bid); 273 nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */ 274 page = alloc_pages_node(nid, GFP_KERNEL, order); 275 if (!page) 276 goto fail; 277 gru_base[bid] = page_address(page); 278 memset(gru_base[bid], 0, sizeof(struct gru_blade_state)); 279 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0]; 280 spin_lock_init(&gru_base[bid]->bs_lock); 281 init_rwsem(&gru_base[bid]->bs_kgts_sema); 282 283 dsrbytes = 0; 284 cbrs = 0; 285 for (gru = gru_base[bid]->bs_grus, chip = 0; 286 chip < GRU_CHIPLETS_PER_BLADE; 287 chip++, gru++) { 288 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip); 289 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip); 290 gru_init_chiplet(gru, paddr, vaddr, bid, chip); 291 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; 292 cbrs = max(cbrs, n); 293 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; 294 dsrbytes = max(dsrbytes, n); 295 } 296 max_user_cbrs = min(max_user_cbrs, cbrs); 297 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes); 298 } 299 300 return 0; 301 302 fail: 303 for (bid--; bid >= 0; bid--) 304 free_pages((unsigned long)gru_base[bid], order); 305 return -ENOMEM; 306 } 307 308 static void gru_free_tables(void) 309 { 310 int bid; 311 int order = get_order(sizeof(struct gru_state) * 312 GRU_CHIPLETS_PER_BLADE); 313 314 for (bid = 0; bid < GRU_MAX_BLADES; bid++) 315 free_pages((unsigned long)gru_base[bid], order); 316 } 317 318 static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep) 319 { 320 unsigned long mmr = 0; 321 int core; 322 323 /* 324 * We target the cores of a blade and not the hyperthreads themselves. 325 * There is a max of 8 cores per socket and 2 sockets per blade, 326 * making for a max total of 16 cores (i.e., 16 CPUs without 327 * hyperthreading and 32 CPUs with hyperthreading). 328 */ 329 core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu); 330 if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu)) 331 return 0; 332 333 if (chiplet == 0) { 334 mmr = UVH_GR0_TLB_INT0_CONFIG + 335 core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG); 336 } else if (chiplet == 1) { 337 mmr = UVH_GR1_TLB_INT0_CONFIG + 338 core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG); 339 } else { 340 BUG(); 341 } 342 343 *corep = core; 344 return mmr; 345 } 346 347 #ifdef CONFIG_IA64 348 349 static int gru_irq_count[GRU_CHIPLETS_PER_BLADE]; 350 351 static void gru_noop(struct irq_data *d) 352 { 353 } 354 355 static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = { 356 [0 ... GRU_CHIPLETS_PER_BLADE - 1] { 357 .irq_mask = gru_noop, 358 .irq_unmask = gru_noop, 359 .irq_ack = gru_noop 360 } 361 }; 362 363 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, 364 irq_handler_t irq_handler, int cpu, int blade) 365 { 366 unsigned long mmr; 367 int irq = IRQ_GRU + chiplet; 368 int ret, core; 369 370 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 371 if (mmr == 0) 372 return 0; 373 374 if (gru_irq_count[chiplet] == 0) { 375 gru_chip[chiplet].name = irq_name; 376 ret = irq_set_chip(irq, &gru_chip[chiplet]); 377 if (ret) { 378 printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n", 379 GRU_DRIVER_ID_STR, -ret); 380 return ret; 381 } 382 383 ret = request_irq(irq, irq_handler, 0, irq_name, NULL); 384 if (ret) { 385 printk(KERN_ERR "%s: request_irq failed, errno=%d\n", 386 GRU_DRIVER_ID_STR, -ret); 387 return ret; 388 } 389 } 390 gru_irq_count[chiplet]++; 391 392 return 0; 393 } 394 395 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) 396 { 397 unsigned long mmr; 398 int core, irq = IRQ_GRU + chiplet; 399 400 if (gru_irq_count[chiplet] == 0) 401 return; 402 403 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 404 if (mmr == 0) 405 return; 406 407 if (--gru_irq_count[chiplet] == 0) 408 free_irq(irq, NULL); 409 } 410 411 #elif defined CONFIG_X86_64 412 413 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, 414 irq_handler_t irq_handler, int cpu, int blade) 415 { 416 unsigned long mmr; 417 int irq, core; 418 int ret; 419 420 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 421 if (mmr == 0) 422 return 0; 423 424 irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU); 425 if (irq < 0) { 426 printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n", 427 GRU_DRIVER_ID_STR, -irq); 428 return irq; 429 } 430 431 ret = request_irq(irq, irq_handler, 0, irq_name, NULL); 432 if (ret) { 433 uv_teardown_irq(irq); 434 printk(KERN_ERR "%s: request_irq failed, errno=%d\n", 435 GRU_DRIVER_ID_STR, -ret); 436 return ret; 437 } 438 gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq; 439 return 0; 440 } 441 442 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) 443 { 444 int irq, core; 445 unsigned long mmr; 446 447 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 448 if (mmr) { 449 irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core]; 450 if (irq) { 451 free_irq(irq, NULL); 452 uv_teardown_irq(irq); 453 } 454 } 455 } 456 457 #endif 458 459 static void gru_teardown_tlb_irqs(void) 460 { 461 int blade; 462 int cpu; 463 464 for_each_online_cpu(cpu) { 465 blade = uv_cpu_to_blade_id(cpu); 466 gru_chiplet_teardown_tlb_irq(0, cpu, blade); 467 gru_chiplet_teardown_tlb_irq(1, cpu, blade); 468 } 469 for_each_possible_blade(blade) { 470 if (uv_blade_nr_possible_cpus(blade)) 471 continue; 472 gru_chiplet_teardown_tlb_irq(0, 0, blade); 473 gru_chiplet_teardown_tlb_irq(1, 0, blade); 474 } 475 } 476 477 static int gru_setup_tlb_irqs(void) 478 { 479 int blade; 480 int cpu; 481 int ret; 482 483 for_each_online_cpu(cpu) { 484 blade = uv_cpu_to_blade_id(cpu); 485 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade); 486 if (ret != 0) 487 goto exit1; 488 489 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade); 490 if (ret != 0) 491 goto exit1; 492 } 493 for_each_possible_blade(blade) { 494 if (uv_blade_nr_possible_cpus(blade)) 495 continue; 496 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade); 497 if (ret != 0) 498 goto exit1; 499 500 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade); 501 if (ret != 0) 502 goto exit1; 503 } 504 505 return 0; 506 507 exit1: 508 gru_teardown_tlb_irqs(); 509 return ret; 510 } 511 512 /* 513 * gru_init 514 * 515 * Called at boot or module load time to initialize the GRUs. 516 */ 517 static int __init gru_init(void) 518 { 519 int ret; 520 521 if (!is_uv_system() || (is_uvx_hub() && !is_uv2_hub())) 522 return 0; 523 524 #if defined CONFIG_IA64 525 gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */ 526 #else 527 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) & 528 0x7fffffffffffUL; 529 #endif 530 gru_start_vaddr = __va(gru_start_paddr); 531 gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE; 532 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", 533 gru_start_paddr, gru_end_paddr); 534 ret = misc_register(&gru_miscdev); 535 if (ret) { 536 printk(KERN_ERR "%s: misc_register failed\n", 537 GRU_DRIVER_ID_STR); 538 goto exit0; 539 } 540 541 ret = gru_proc_init(); 542 if (ret) { 543 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); 544 goto exit1; 545 } 546 547 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr); 548 if (ret) { 549 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR); 550 goto exit2; 551 } 552 553 ret = gru_setup_tlb_irqs(); 554 if (ret != 0) 555 goto exit3; 556 557 gru_kservices_init(); 558 559 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, 560 GRU_DRIVER_VERSION_STR); 561 return 0; 562 563 exit3: 564 gru_free_tables(); 565 exit2: 566 gru_proc_exit(); 567 exit1: 568 misc_deregister(&gru_miscdev); 569 exit0: 570 return ret; 571 572 } 573 574 static void __exit gru_exit(void) 575 { 576 if (!is_uv_system()) 577 return; 578 579 gru_teardown_tlb_irqs(); 580 gru_kservices_exit(); 581 gru_free_tables(); 582 misc_deregister(&gru_miscdev); 583 gru_proc_exit(); 584 } 585 586 static const struct file_operations gru_fops = { 587 .owner = THIS_MODULE, 588 .unlocked_ioctl = gru_file_unlocked_ioctl, 589 .mmap = gru_file_mmap, 590 .llseek = noop_llseek, 591 }; 592 593 static struct miscdevice gru_miscdev = { 594 .minor = MISC_DYNAMIC_MINOR, 595 .name = "gru", 596 .fops = &gru_fops, 597 }; 598 599 const struct vm_operations_struct gru_vm_ops = { 600 .close = gru_vma_close, 601 .fault = gru_fault, 602 }; 603 604 #ifndef MODULE 605 fs_initcall(gru_init); 606 #else 607 module_init(gru_init); 608 #endif 609 module_exit(gru_exit); 610 611 module_param(gru_options, ulong, 0644); 612 MODULE_PARM_DESC(gru_options, "Various debug options"); 613 614 MODULE_AUTHOR("Silicon Graphics, Inc."); 615 MODULE_LICENSE("GPL"); 616 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR); 617 MODULE_VERSION(GRU_DRIVER_VERSION_STR); 618 619