1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SN Platform GRU Driver 4 * 5 * FILE OPERATIONS & DRIVER INITIALIZATION 6 * 7 * This file supports the user system call for file open, close, mmap, etc. 8 * This also incudes the driver initialization code. 9 * 10 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP 11 * Copyright (c) 2008-2014 Silicon Graphics, Inc. All Rights Reserved. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/errno.h> 17 #include <linux/slab.h> 18 #include <linux/mm.h> 19 #include <linux/io.h> 20 #include <linux/spinlock.h> 21 #include <linux/device.h> 22 #include <linux/miscdevice.h> 23 #include <linux/interrupt.h> 24 #include <linux/proc_fs.h> 25 #include <linux/uaccess.h> 26 #ifdef CONFIG_X86_64 27 #include <asm/uv/uv_irq.h> 28 #endif 29 #include <asm/uv/uv.h> 30 #include "gru.h" 31 #include "grulib.h" 32 #include "grutables.h" 33 34 #include <asm/uv/uv_hub.h> 35 #include <asm/uv/uv_mmrs.h> 36 37 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly; 38 unsigned long gru_start_paddr __read_mostly; 39 void *gru_start_vaddr __read_mostly; 40 unsigned long gru_end_paddr __read_mostly; 41 unsigned int gru_max_gids __read_mostly; 42 struct gru_stats_s gru_stats; 43 44 /* Guaranteed user available resources on each node */ 45 static int max_user_cbrs, max_user_dsr_bytes; 46 47 static struct miscdevice gru_miscdev; 48 49 static int gru_supported(void) 50 { 51 return is_uv_system() && 52 (uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE); 53 } 54 55 /* 56 * gru_vma_close 57 * 58 * Called when unmapping a device mapping. Frees all gru resources 59 * and tables belonging to the vma. 60 */ 61 static void gru_vma_close(struct vm_area_struct *vma) 62 { 63 struct gru_vma_data *vdata; 64 struct gru_thread_state *gts; 65 struct list_head *entry, *next; 66 67 if (!vma->vm_private_data) 68 return; 69 70 vdata = vma->vm_private_data; 71 vma->vm_private_data = NULL; 72 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file, 73 vdata); 74 list_for_each_safe(entry, next, &vdata->vd_head) { 75 gts = 76 list_entry(entry, struct gru_thread_state, ts_next); 77 list_del(>s->ts_next); 78 mutex_lock(>s->ts_ctxlock); 79 if (gts->ts_gru) 80 gru_unload_context(gts, 0); 81 mutex_unlock(>s->ts_ctxlock); 82 gts_drop(gts); 83 } 84 kfree(vdata); 85 STAT(vdata_free); 86 } 87 88 /* 89 * gru_file_mmap 90 * 91 * Called when mmapping the device. Initializes the vma with a fault handler 92 * and private data structure necessary to allocate, track, and free the 93 * underlying pages. 94 */ 95 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma) 96 { 97 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE)) 98 return -EPERM; 99 100 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) || 101 vma->vm_end & (GRU_GSEG_PAGESIZE - 1)) 102 return -EINVAL; 103 104 vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_LOCKED | 105 VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP); 106 vma->vm_page_prot = PAGE_SHARED; 107 vma->vm_ops = &gru_vm_ops; 108 109 vma->vm_private_data = gru_alloc_vma_data(vma, 0); 110 if (!vma->vm_private_data) 111 return -ENOMEM; 112 113 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n", 114 file, vma->vm_start, vma, vma->vm_private_data); 115 return 0; 116 } 117 118 /* 119 * Create a new GRU context 120 */ 121 static int gru_create_new_context(unsigned long arg) 122 { 123 struct gru_create_context_req req; 124 struct vm_area_struct *vma; 125 struct gru_vma_data *vdata; 126 int ret = -EINVAL; 127 128 if (copy_from_user(&req, (void __user *)arg, sizeof(req))) 129 return -EFAULT; 130 131 if (req.data_segment_bytes > max_user_dsr_bytes) 132 return -EINVAL; 133 if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count) 134 return -EINVAL; 135 136 if (!(req.options & GRU_OPT_MISS_MASK)) 137 req.options |= GRU_OPT_MISS_FMM_INTR; 138 139 mmap_write_lock(current->mm); 140 vma = gru_find_vma(req.gseg); 141 if (vma) { 142 vdata = vma->vm_private_data; 143 vdata->vd_user_options = req.options; 144 vdata->vd_dsr_au_count = 145 GRU_DS_BYTES_TO_AU(req.data_segment_bytes); 146 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks); 147 vdata->vd_tlb_preload_count = req.tlb_preload_count; 148 ret = 0; 149 } 150 mmap_write_unlock(current->mm); 151 152 return ret; 153 } 154 155 /* 156 * Get GRU configuration info (temp - for emulator testing) 157 */ 158 static long gru_get_config_info(unsigned long arg) 159 { 160 struct gru_config_info info; 161 int nodesperblade; 162 163 if (num_online_nodes() > 1 && 164 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0))) 165 nodesperblade = 2; 166 else 167 nodesperblade = 1; 168 memset(&info, 0, sizeof(info)); 169 info.cpus = num_online_cpus(); 170 info.nodes = num_online_nodes(); 171 info.blades = info.nodes / nodesperblade; 172 info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades; 173 174 if (copy_to_user((void __user *)arg, &info, sizeof(info))) 175 return -EFAULT; 176 return 0; 177 } 178 179 /* 180 * gru_file_unlocked_ioctl 181 * 182 * Called to update file attributes via IOCTL calls. 183 */ 184 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req, 185 unsigned long arg) 186 { 187 int err = -EBADRQC; 188 189 gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg); 190 191 switch (req) { 192 case GRU_CREATE_CONTEXT: 193 err = gru_create_new_context(arg); 194 break; 195 case GRU_SET_CONTEXT_OPTION: 196 err = gru_set_context_option(arg); 197 break; 198 case GRU_USER_GET_EXCEPTION_DETAIL: 199 err = gru_get_exception_detail(arg); 200 break; 201 case GRU_USER_UNLOAD_CONTEXT: 202 err = gru_user_unload_context(arg); 203 break; 204 case GRU_USER_FLUSH_TLB: 205 err = gru_user_flush_tlb(arg); 206 break; 207 case GRU_USER_CALL_OS: 208 err = gru_handle_user_call_os(arg); 209 break; 210 case GRU_GET_GSEG_STATISTICS: 211 err = gru_get_gseg_statistics(arg); 212 break; 213 case GRU_KTEST: 214 err = gru_ktest(arg); 215 break; 216 case GRU_GET_CONFIG_INFO: 217 err = gru_get_config_info(arg); 218 break; 219 case GRU_DUMP_CHIPLET_STATE: 220 err = gru_dump_chiplet_request(arg); 221 break; 222 } 223 return err; 224 } 225 226 /* 227 * Called at init time to build tables for all GRUs that are present in the 228 * system. 229 */ 230 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, 231 void *vaddr, int blade_id, int chiplet_id) 232 { 233 spin_lock_init(&gru->gs_lock); 234 spin_lock_init(&gru->gs_asid_lock); 235 gru->gs_gru_base_paddr = paddr; 236 gru->gs_gru_base_vaddr = vaddr; 237 gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id; 238 gru->gs_blade = gru_base[blade_id]; 239 gru->gs_blade_id = blade_id; 240 gru->gs_chiplet_id = chiplet_id; 241 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; 242 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; 243 gru->gs_asid_limit = MAX_ASID; 244 gru_tgh_flush_init(gru); 245 if (gru->gs_gid >= gru_max_gids) 246 gru_max_gids = gru->gs_gid + 1; 247 gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n", 248 blade_id, gru->gs_gid, gru->gs_gru_base_vaddr, 249 gru->gs_gru_base_paddr); 250 } 251 252 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr) 253 { 254 int pnode, nid, bid, chip; 255 int cbrs, dsrbytes, n; 256 int order = get_order(sizeof(struct gru_blade_state)); 257 struct page *page; 258 struct gru_state *gru; 259 unsigned long paddr; 260 void *vaddr; 261 262 max_user_cbrs = GRU_NUM_CB; 263 max_user_dsr_bytes = GRU_NUM_DSR_BYTES; 264 for_each_possible_blade(bid) { 265 pnode = uv_blade_to_pnode(bid); 266 nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */ 267 page = alloc_pages_node(nid, GFP_KERNEL, order); 268 if (!page) 269 goto fail; 270 gru_base[bid] = page_address(page); 271 memset(gru_base[bid], 0, sizeof(struct gru_blade_state)); 272 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0]; 273 spin_lock_init(&gru_base[bid]->bs_lock); 274 init_rwsem(&gru_base[bid]->bs_kgts_sema); 275 276 dsrbytes = 0; 277 cbrs = 0; 278 for (gru = gru_base[bid]->bs_grus, chip = 0; 279 chip < GRU_CHIPLETS_PER_BLADE; 280 chip++, gru++) { 281 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip); 282 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip); 283 gru_init_chiplet(gru, paddr, vaddr, bid, chip); 284 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; 285 cbrs = max(cbrs, n); 286 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; 287 dsrbytes = max(dsrbytes, n); 288 } 289 max_user_cbrs = min(max_user_cbrs, cbrs); 290 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes); 291 } 292 293 return 0; 294 295 fail: 296 for (bid--; bid >= 0; bid--) 297 free_pages((unsigned long)gru_base[bid], order); 298 return -ENOMEM; 299 } 300 301 static void gru_free_tables(void) 302 { 303 int bid; 304 int order = get_order(sizeof(struct gru_state) * 305 GRU_CHIPLETS_PER_BLADE); 306 307 for (bid = 0; bid < GRU_MAX_BLADES; bid++) 308 free_pages((unsigned long)gru_base[bid], order); 309 } 310 311 static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep) 312 { 313 unsigned long mmr = 0; 314 int core; 315 316 /* 317 * We target the cores of a blade and not the hyperthreads themselves. 318 * There is a max of 8 cores per socket and 2 sockets per blade, 319 * making for a max total of 16 cores (i.e., 16 CPUs without 320 * hyperthreading and 32 CPUs with hyperthreading). 321 */ 322 core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu); 323 if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu)) 324 return 0; 325 326 if (chiplet == 0) { 327 mmr = UVH_GR0_TLB_INT0_CONFIG + 328 core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG); 329 } else if (chiplet == 1) { 330 mmr = UVH_GR1_TLB_INT0_CONFIG + 331 core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG); 332 } else { 333 BUG(); 334 } 335 336 *corep = core; 337 return mmr; 338 } 339 340 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, 341 irq_handler_t irq_handler, int cpu, int blade) 342 { 343 unsigned long mmr; 344 int irq, core; 345 int ret; 346 347 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 348 if (mmr == 0) 349 return 0; 350 351 irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU); 352 if (irq < 0) { 353 printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n", 354 GRU_DRIVER_ID_STR, -irq); 355 return irq; 356 } 357 358 ret = request_irq(irq, irq_handler, 0, irq_name, NULL); 359 if (ret) { 360 uv_teardown_irq(irq); 361 printk(KERN_ERR "%s: request_irq failed, errno=%d\n", 362 GRU_DRIVER_ID_STR, -ret); 363 return ret; 364 } 365 gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq; 366 return 0; 367 } 368 369 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) 370 { 371 int irq, core; 372 unsigned long mmr; 373 374 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); 375 if (mmr) { 376 irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core]; 377 if (irq) { 378 free_irq(irq, NULL); 379 uv_teardown_irq(irq); 380 } 381 } 382 } 383 384 static void gru_teardown_tlb_irqs(void) 385 { 386 int blade; 387 int cpu; 388 389 for_each_online_cpu(cpu) { 390 blade = uv_cpu_to_blade_id(cpu); 391 gru_chiplet_teardown_tlb_irq(0, cpu, blade); 392 gru_chiplet_teardown_tlb_irq(1, cpu, blade); 393 } 394 for_each_possible_blade(blade) { 395 if (uv_blade_nr_possible_cpus(blade)) 396 continue; 397 gru_chiplet_teardown_tlb_irq(0, 0, blade); 398 gru_chiplet_teardown_tlb_irq(1, 0, blade); 399 } 400 } 401 402 static int gru_setup_tlb_irqs(void) 403 { 404 int blade; 405 int cpu; 406 int ret; 407 408 for_each_online_cpu(cpu) { 409 blade = uv_cpu_to_blade_id(cpu); 410 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade); 411 if (ret != 0) 412 goto exit1; 413 414 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade); 415 if (ret != 0) 416 goto exit1; 417 } 418 for_each_possible_blade(blade) { 419 if (uv_blade_nr_possible_cpus(blade)) 420 continue; 421 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade); 422 if (ret != 0) 423 goto exit1; 424 425 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade); 426 if (ret != 0) 427 goto exit1; 428 } 429 430 return 0; 431 432 exit1: 433 gru_teardown_tlb_irqs(); 434 return ret; 435 } 436 437 /* 438 * gru_init 439 * 440 * Called at boot or module load time to initialize the GRUs. 441 */ 442 static int __init gru_init(void) 443 { 444 int ret; 445 446 if (!gru_supported()) 447 return 0; 448 449 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG) & 450 0x7fffffffffffUL; 451 gru_start_vaddr = __va(gru_start_paddr); 452 gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE; 453 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", 454 gru_start_paddr, gru_end_paddr); 455 ret = misc_register(&gru_miscdev); 456 if (ret) { 457 printk(KERN_ERR "%s: misc_register failed\n", 458 GRU_DRIVER_ID_STR); 459 goto exit0; 460 } 461 462 ret = gru_proc_init(); 463 if (ret) { 464 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); 465 goto exit1; 466 } 467 468 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr); 469 if (ret) { 470 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR); 471 goto exit2; 472 } 473 474 ret = gru_setup_tlb_irqs(); 475 if (ret != 0) 476 goto exit3; 477 478 gru_kservices_init(); 479 480 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, 481 GRU_DRIVER_VERSION_STR); 482 return 0; 483 484 exit3: 485 gru_free_tables(); 486 exit2: 487 gru_proc_exit(); 488 exit1: 489 misc_deregister(&gru_miscdev); 490 exit0: 491 return ret; 492 493 } 494 495 static void __exit gru_exit(void) 496 { 497 if (!gru_supported()) 498 return; 499 500 gru_teardown_tlb_irqs(); 501 gru_kservices_exit(); 502 gru_free_tables(); 503 misc_deregister(&gru_miscdev); 504 gru_proc_exit(); 505 mmu_notifier_synchronize(); 506 } 507 508 static const struct file_operations gru_fops = { 509 .owner = THIS_MODULE, 510 .unlocked_ioctl = gru_file_unlocked_ioctl, 511 .mmap = gru_file_mmap, 512 .llseek = noop_llseek, 513 }; 514 515 static struct miscdevice gru_miscdev = { 516 .minor = MISC_DYNAMIC_MINOR, 517 .name = "gru", 518 .fops = &gru_fops, 519 }; 520 521 const struct vm_operations_struct gru_vm_ops = { 522 .close = gru_vma_close, 523 .fault = gru_fault, 524 }; 525 526 #ifndef MODULE 527 fs_initcall(gru_init); 528 #else 529 module_init(gru_init); 530 #endif 531 module_exit(gru_exit); 532 533 module_param(gru_options, ulong, 0644); 534 MODULE_PARM_DESC(gru_options, "Various debug options"); 535 536 MODULE_AUTHOR("Silicon Graphics, Inc."); 537 MODULE_LICENSE("GPL"); 538 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR); 539 MODULE_VERSION(GRU_DRIVER_VERSION_STR); 540 541