drivers/misc/sgi-gru/grufile.c

   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/smp_lock.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/device.h>
  35 #include <linux/miscdevice.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/uaccess.h>
  39 #include "gru.h"
  40 #include "grulib.h"
  41 #include "grutables.h"
  42
  43 #if defined CONFIG_X86_64
  44 #include <asm/genapic.h>
  45 #include <asm/irq.h>
  46 #define IS_UV()         is_uv_system()
  47 #elif defined CONFIG_IA64
  48 #include <asm/system.h>
  49 #include <asm/sn/simulator.h>
  50 /* temp support for running on hardware simulator */
  51 #define IS_UV()         IS_MEDUSA() || ia64_platform_is("uv")
  52 #else
  53 #define IS_UV()         0
  54 #endif
  55
  56 #include <asm/uv/uv_hub.h>
  57 #include <asm/uv/uv_mmrs.h>
  58
  59 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
  60 unsigned long gru_start_paddr, gru_end_paddr __read_mostly;
  61 struct gru_stats_s gru_stats;
  62
  63 /* Guaranteed user available resources on each node */
  64 static int max_user_cbrs, max_user_dsr_bytes;
  65
  66 static struct file_operations gru_fops;
  67 static struct miscdevice gru_miscdev;
  68
  69
  70 /*
  71  * gru_vma_close
  72  *
  73  * Called when unmapping a device mapping. Frees all gru resources
  74  * and tables belonging to the vma.
  75  */
  76 static void gru_vma_close(struct vm_area_struct *vma)
  77 {
  78         struct gru_vma_data *vdata;
  79         struct gru_thread_state *gts;
  80         struct list_head *entry, *next;
  81
  82         if (!vma->vm_private_data)
  83                 return;
  84
  85         vdata = vma->vm_private_data;
  86         vma->vm_private_data = NULL;
  87         gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
  88                                 vdata);
  89         list_for_each_safe(entry, next, &vdata->vd_head) {
  90                 gts =
  91                     list_entry(entry, struct gru_thread_state, ts_next);
  92                 list_del(&gts->ts_next);
  93                 mutex_lock(&gts->ts_ctxlock);
  94                 if (gts->ts_gru)
  95                         gru_unload_context(gts, 0);
  96                 mutex_unlock(&gts->ts_ctxlock);
  97                 gts_drop(gts);
  98         }
  99         kfree(vdata);
 100         STAT(vdata_free);
 101 }
 102
 103 /*
 104  * gru_file_mmap
 105  *
 106  * Called when mmaping the device.  Initializes the vma with a fault handler
 107  * and private data structure necessary to allocate, track, and free the
 108  * underlying pages.
 109  */
 110 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
 111 {
 112         if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
 113                 return -EPERM;
 114
 115         if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
 116                         vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
 117                 return -EINVAL;
 118
 119         vma->vm_flags |=
 120             (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
 121                         VM_RESERVED);
 122         vma->vm_page_prot = PAGE_SHARED;
 123         vma->vm_ops = &gru_vm_ops;
 124
 125         vma->vm_private_data = gru_alloc_vma_data(vma, 0);
 126         if (!vma->vm_private_data)
 127                 return -ENOMEM;
 128
 129         gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
 130                 file, vma->vm_start, vma, vma->vm_private_data);
 131         return 0;
 132 }
 133
 134 /*
 135  * Create a new GRU context
 136  */
 137 static int gru_create_new_context(unsigned long arg)
 138 {
 139         struct gru_create_context_req req;
 140         struct vm_area_struct *vma;
 141         struct gru_vma_data *vdata;
 142         int ret = -EINVAL;
 143
 144
 145         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 146                 return -EFAULT;
 147
 148         if (req.data_segment_bytes == 0 ||
 149                                 req.data_segment_bytes > max_user_dsr_bytes)
 150                 return -EINVAL;
 151         if (!req.control_blocks || !req.maximum_thread_count ||
 152                                 req.control_blocks > max_user_cbrs)
 153                 return -EINVAL;
 154
 155         if (!(req.options & GRU_OPT_MISS_MASK))
 156                 req.options |= GRU_OPT_MISS_FMM_INTR;
 157
 158         down_write(&current->mm->mmap_sem);
 159         vma = gru_find_vma(req.gseg);
 160         if (vma) {
 161                 vdata = vma->vm_private_data;
 162                 vdata->vd_user_options = req.options;
 163                 vdata->vd_dsr_au_count =
 164                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
 165                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
 166                 ret = 0;
 167         }
 168         up_write(&current->mm->mmap_sem);
 169
 170         return ret;
 171 }
 172
 173 /*
 174  * Get GRU configuration info (temp - for emulator testing)
 175  */
 176 static long gru_get_config_info(unsigned long arg)
 177 {
 178         struct gru_config_info info;
 179         int nodesperblade;
 180
 181         if (num_online_nodes() > 1 &&
 182                         (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
 183                 nodesperblade = 2;
 184         else
 185                 nodesperblade = 1;
 186         info.cpus = num_online_cpus();
 187         info.nodes = num_online_nodes();
 188         info.blades = info.nodes / nodesperblade;
 189         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
 190
 191         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 192                 return -EFAULT;
 193         return 0;
 194 }
 195
 196 /*
 197  * Get GRU chiplet status
 198  */
 199 static long gru_get_chiplet_status(unsigned long arg)
 200 {
 201         struct gru_state *gru;
 202         struct gru_chiplet_info info;
 203
 204         if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
 205                 return -EFAULT;
 206
 207         if (info.node == -1)
 208                 info.node = numa_node_id();
 209         if (info.node >= num_possible_nodes() ||
 210                         info.chiplet >= GRU_CHIPLETS_PER_HUB ||
 211                         info.node < 0 || info.chiplet < 0)
 212                 return -EINVAL;
 213
 214         info.blade = uv_node_to_blade_id(info.node);
 215         gru = get_gru(info.blade, info.chiplet);
 216
 217         info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
 218         info.total_cbr = GRU_NUM_CB;
 219         info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
 220                 gru->gs_reserved_dsr_bytes;
 221         info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
 222         info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
 223                         GRU_DSR_AU_BYTES;
 224         info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
 225
 226         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 227                 return -EFAULT;
 228         return 0;
 229 }
 230
 231 /*
 232  * gru_file_unlocked_ioctl
 233  *
 234  * Called to update file attributes via IOCTL calls.
 235  */
 236 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
 237                                     unsigned long arg)
 238 {
 239         int err = -EBADRQC;
 240
 241         gru_dbg(grudev, "file %p\n", file);
 242
 243         switch (req) {
 244         case GRU_CREATE_CONTEXT:
 245                 err = gru_create_new_context(arg);
 246                 break;
 247         case GRU_SET_TASK_SLICE:
 248                 err = gru_set_task_slice(arg);
 249                 break;
 250         case GRU_USER_GET_EXCEPTION_DETAIL:
 251                 err = gru_get_exception_detail(arg);
 252                 break;
 253         case GRU_USER_UNLOAD_CONTEXT:
 254                 err = gru_user_unload_context(arg);
 255                 break;
 256         case GRU_GET_CHIPLET_STATUS:
 257                 err = gru_get_chiplet_status(arg);
 258                 break;
 259         case GRU_USER_FLUSH_TLB:
 260                 err = gru_user_flush_tlb(arg);
 261                 break;
 262         case GRU_USER_CALL_OS:
 263                 err = gru_handle_user_call_os(arg);
 264                 break;
 265         case GRU_GET_CONFIG_INFO:
 266                 err = gru_get_config_info(arg);
 267                 break;
 268         }
 269         return err;
 270 }
 271
 272 /*
 273  * Called at init time to build tables for all GRUs that are present in the
 274  * system.
 275  */
 276 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
 277                              void *vaddr, int nid, int bid, int grunum)
 278 {
 279         spin_lock_init(&gru->gs_lock);
 280         spin_lock_init(&gru->gs_asid_lock);
 281         gru->gs_gru_base_paddr = paddr;
 282         gru->gs_gru_base_vaddr = vaddr;
 283         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
 284         gru->gs_blade = gru_base[bid];
 285         gru->gs_blade_id = bid;
 286         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
 287         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
 288         gru_tgh_flush_init(gru);
 289         gru_dbg(grudev, "bid %d, nid %d, gru %x, vaddr %p (0x%lx)\n",
 290                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
 291                 gru->gs_gru_base_paddr);
 292         gru_kservices_init(gru);
 293 }
 294
 295 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
 296 {
 297         int pnode, nid, bid, chip;
 298         int cbrs, dsrbytes, n;
 299         int order = get_order(sizeof(struct gru_blade_state));
 300         struct page *page;
 301         struct gru_state *gru;
 302         unsigned long paddr;
 303         void *vaddr;
 304
 305         max_user_cbrs = GRU_NUM_CB;
 306         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
 307         for_each_online_node(nid) {
 308                 bid = uv_node_to_blade_id(nid);
 309                 pnode = uv_node_to_pnode(nid);
 310                 if (gru_base[bid])
 311                         continue;
 312                 page = alloc_pages_node(nid, GFP_KERNEL, order);
 313                 if (!page)
 314                         goto fail;
 315                 gru_base[bid] = page_address(page);
 316                 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
 317                 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
 318                 spin_lock_init(&gru_base[bid]->bs_lock);
 319
 320                 dsrbytes = 0;
 321                 cbrs = 0;
 322                 for (gru = gru_base[bid]->bs_grus, chip = 0;
 323                                 chip < GRU_CHIPLETS_PER_BLADE;
 324                                 chip++, gru++) {
 325                         paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
 326                         vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
 327                         gru_init_chiplet(gru, paddr, vaddr, bid, nid, chip);
 328                         n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
 329                         cbrs = max(cbrs, n);
 330                         n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
 331                         dsrbytes = max(dsrbytes, n);
 332                 }
 333                 max_user_cbrs = min(max_user_cbrs, cbrs);
 334                 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
 335         }
 336
 337         return 0;
 338
 339 fail:
 340         for (nid--; nid >= 0; nid--)
 341                 free_pages((unsigned long)gru_base[nid], order);
 342         return -ENOMEM;
 343 }
 344
 345 #ifdef CONFIG_IA64
 346
 347 static int get_base_irq(void)
 348 {
 349         return IRQ_GRU;
 350 }
 351
 352 #elif defined CONFIG_X86_64
 353
 354 static void noop(unsigned int irq)
 355 {
 356 }
 357
 358 static struct irq_chip gru_chip = {
 359         .name           = "gru",
 360         .mask           = noop,
 361         .unmask         = noop,
 362         .ack            = noop,
 363 };
 364
 365 static int get_base_irq(void)
 366 {
 367         set_irq_chip(IRQ_GRU, &gru_chip);
 368         set_irq_chip(IRQ_GRU + 1, &gru_chip);
 369         return IRQ_GRU;
 370 }
 371 #endif
 372
 373 /*
 374  * gru_init
 375  *
 376  * Called at boot or module load time to initialize the GRUs.
 377  */
 378 static int __init gru_init(void)
 379 {
 380         int ret, irq, chip;
 381         char id[10];
 382         void *gru_start_vaddr;
 383
 384         if (!IS_UV())
 385                 return 0;
 386
 387 #if defined CONFIG_IA64
 388         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
 389 #else
 390         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
 391                                 0x7fffffffffffUL;
 392
 393 #endif
 394         gru_start_vaddr = __va(gru_start_paddr);
 395         gru_end_paddr = gru_start_paddr + MAX_NUMNODES * GRU_SIZE;
 396         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
 397                gru_start_paddr, gru_end_paddr);
 398         irq = get_base_irq();
 399         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
 400                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
 401                 if (ret) {
 402                         printk(KERN_ERR "%s: request_irq failed\n",
 403                                GRU_DRIVER_ID_STR);
 404                         goto exit1;
 405                 }
 406         }
 407
 408         ret = misc_register(&gru_miscdev);
 409         if (ret) {
 410                 printk(KERN_ERR "%s: misc_register failed\n",
 411                        GRU_DRIVER_ID_STR);
 412                 goto exit1;
 413         }
 414
 415         ret = gru_proc_init();
 416         if (ret) {
 417                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
 418                 goto exit2;
 419         }
 420
 421         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
 422         if (ret) {
 423                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
 424                 goto exit3;
 425         }
 426
 427         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
 428                GRU_DRIVER_VERSION_STR);
 429         return 0;
 430
 431 exit3:
 432         gru_proc_exit();
 433 exit2:
 434         misc_deregister(&gru_miscdev);
 435 exit1:
 436         for (--chip; chip >= 0; chip--)
 437                 free_irq(irq + chip, NULL);
 438         return ret;
 439
 440 }
 441
 442 static void __exit gru_exit(void)
 443 {
 444         int i, bid;
 445         int order = get_order(sizeof(struct gru_state) *
 446                               GRU_CHIPLETS_PER_BLADE);
 447
 448         if (!IS_UV())
 449                 return;
 450
 451         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 452                 free_irq(IRQ_GRU + i, NULL);
 453
 454         for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 455                 free_pages((unsigned long)gru_base[bid], order);
 456
 457         misc_deregister(&gru_miscdev);
 458         gru_proc_exit();
 459 }
 460
 461 static struct file_operations gru_fops = {
 462         .owner          = THIS_MODULE,
 463         .unlocked_ioctl = gru_file_unlocked_ioctl,
 464         .mmap           = gru_file_mmap,
 465 };
 466
 467 static struct miscdevice gru_miscdev = {
 468         .minor          = MISC_DYNAMIC_MINOR,
 469         .name           = "gru",
 470         .fops           = &gru_fops,
 471 };
 472
 473 struct vm_operations_struct gru_vm_ops = {
 474         .close          = gru_vma_close,
 475         .fault          = gru_fault,
 476 };
 477
 478 module_init(gru_init);
 479 module_exit(gru_exit);
 480
 481 module_param(gru_options, ulong, 0644);
 482 MODULE_PARM_DESC(gru_options, "Various debug options");
 483
 484 MODULE_AUTHOR("Silicon Graphics, Inc.");
 485 MODULE_LICENSE("GPL");
 486 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
 487 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
 488