drivers/misc/sgi-gru/grufile.c

   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(&gts->ts_next);
  78                 mutex_lock(&gts->ts_ctxlock);
  79                 if (gts->ts_gru)
  80                         gru_unload_context(gts, 0);
  81                 mutex_unlock(&gts->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