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/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 #include <asm/uv/uv.h>
  39 #include "gru.h"
  40 #include "grulib.h"
  41 #include "grutables.h"
  42
  43 #include <asm/uv/uv_hub.h>
  44 #include <asm/uv/uv_mmrs.h>
  45
  46 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
  47 unsigned long gru_start_paddr __read_mostly;
  48 void *gru_start_vaddr __read_mostly;
  49 unsigned long gru_end_paddr __read_mostly;
  50 unsigned int gru_max_gids __read_mostly;
  51 struct gru_stats_s gru_stats;
  52
  53 /* Guaranteed user available resources on each node */
  54 static int max_user_cbrs, max_user_dsr_bytes;
  55
  56 static struct miscdevice gru_miscdev;
  57
  58
  59 /*
  60  * gru_vma_close
  61  *
  62  * Called when unmapping a device mapping. Frees all gru resources
  63  * and tables belonging to the vma.
  64  */
  65 static void gru_vma_close(struct vm_area_struct *vma)
  66 {
  67         struct gru_vma_data *vdata;
  68         struct gru_thread_state *gts;
  69         struct list_head *entry, *next;
  70
  71         if (!vma->vm_private_data)
  72                 return;
  73
  74         vdata = vma->vm_private_data;
  75         vma->vm_private_data = NULL;
  76         gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
  77                                 vdata);
  78         list_for_each_safe(entry, next, &vdata->vd_head) {
  79                 gts =
  80                     list_entry(entry, struct gru_thread_state, ts_next);
  81                 list_del(&gts->ts_next);
  82                 mutex_lock(&gts->ts_ctxlock);
  83                 if (gts->ts_gru)
  84                         gru_unload_context(gts, 0);
  85                 mutex_unlock(&gts->ts_ctxlock);
  86                 gts_drop(gts);
  87         }
  88         kfree(vdata);
  89         STAT(vdata_free);
  90 }
  91
  92 /*
  93  * gru_file_mmap
  94  *
  95  * Called when mmapping the device.  Initializes the vma with a fault handler
  96  * and private data structure necessary to allocate, track, and free the
  97  * underlying pages.
  98  */
  99 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
 100 {
 101         if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
 102                 return -EPERM;
 103
 104         if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
 105                                 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
 106                 return -EINVAL;
 107
 108         vma->vm_flags |=
 109             (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
 110                         VM_RESERVED);
 111         vma->vm_page_prot = PAGE_SHARED;
 112         vma->vm_ops = &gru_vm_ops;
 113
 114         vma->vm_private_data = gru_alloc_vma_data(vma, 0);
 115         if (!vma->vm_private_data)
 116                 return -ENOMEM;
 117
 118         gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
 119                 file, vma->vm_start, vma, vma->vm_private_data);
 120         return 0;
 121 }
 122
 123 /*
 124  * Create a new GRU context
 125  */
 126 static int gru_create_new_context(unsigned long arg)
 127 {
 128         struct gru_create_context_req req;
 129         struct vm_area_struct *vma;
 130         struct gru_vma_data *vdata;
 131         int ret = -EINVAL;
 132
 133
 134         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 135                 return -EFAULT;
 136
 137         if (req.data_segment_bytes > max_user_dsr_bytes)
 138                 return -EINVAL;
 139         if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
 140                 return -EINVAL;
 141
 142         if (!(req.options & GRU_OPT_MISS_MASK))
 143                 req.options |= GRU_OPT_MISS_FMM_INTR;
 144
 145         down_write(&current->mm->mmap_sem);
 146         vma = gru_find_vma(req.gseg);
 147         if (vma) {
 148                 vdata = vma->vm_private_data;
 149                 vdata->vd_user_options = req.options;
 150                 vdata->vd_dsr_au_count =
 151                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
 152                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
 153                 ret = 0;
 154         }
 155         up_write(&current->mm->mmap_sem);
 156
 157         return ret;
 158 }
 159
 160 /*
 161  * Get GRU configuration info (temp - for emulator testing)
 162  */
 163 static long gru_get_config_info(unsigned long arg)
 164 {
 165         struct gru_config_info info;
 166         int nodesperblade;
 167
 168         if (num_online_nodes() > 1 &&
 169                         (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
 170                 nodesperblade = 2;
 171         else
 172                 nodesperblade = 1;
 173         info.cpus = num_online_cpus();
 174         info.nodes = num_online_nodes();
 175         info.blades = info.nodes / nodesperblade;
 176         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
 177
 178         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 179                 return -EFAULT;
 180         return 0;
 181 }
 182
 183 /*
 184  * gru_file_unlocked_ioctl
 185  *
 186  * Called to update file attributes via IOCTL calls.
 187  */
 188 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
 189                                     unsigned long arg)
 190 {
 191         int err = -EBADRQC;
 192
 193         gru_dbg(grudev, "file %p\n", file);
 194
 195         switch (req) {
 196         case GRU_CREATE_CONTEXT:
 197                 err = gru_create_new_context(arg);
 198                 break;
 199         case GRU_SET_CONTEXT_OPTION:
 200                 err = gru_set_context_option(arg);
 201                 break;
 202         case GRU_USER_GET_EXCEPTION_DETAIL:
 203                 err = gru_get_exception_detail(arg);
 204                 break;
 205         case GRU_USER_UNLOAD_CONTEXT:
 206                 err = gru_user_unload_context(arg);
 207                 break;
 208         case GRU_USER_FLUSH_TLB:
 209                 err = gru_user_flush_tlb(arg);
 210                 break;
 211         case GRU_USER_CALL_OS:
 212                 err = gru_handle_user_call_os(arg);
 213                 break;
 214         case GRU_GET_GSEG_STATISTICS:
 215                 err = gru_get_gseg_statistics(arg);
 216                 break;
 217         case GRU_KTEST:
 218                 err = gru_ktest(arg);
 219                 break;
 220         case GRU_GET_CONFIG_INFO:
 221                 err = gru_get_config_info(arg);
 222                 break;
 223         case GRU_DUMP_CHIPLET_STATE:
 224                 err = gru_dump_chiplet_request(arg);
 225                 break;
 226         }
 227         return err;
 228 }
 229
 230 /*
 231  * Called at init time to build tables for all GRUs that are present in the
 232  * system.
 233  */
 234 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
 235                              void *vaddr, int nid, int bid, int grunum)
 236 {
 237         spin_lock_init(&gru->gs_lock);
 238         spin_lock_init(&gru->gs_asid_lock);
 239         gru->gs_gru_base_paddr = paddr;
 240         gru->gs_gru_base_vaddr = vaddr;
 241         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
 242         gru->gs_blade = gru_base[bid];
 243         gru->gs_blade_id = bid;
 244         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
 245         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
 246         gru->gs_asid_limit = MAX_ASID;
 247         gru_tgh_flush_init(gru);
 248         if (gru->gs_gid >= gru_max_gids)
 249                 gru_max_gids = gru->gs_gid + 1;
 250         gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
 251                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
 252                 gru->gs_gru_base_paddr);
 253 }
 254
 255 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
 256 {
 257         int pnode, nid, bid, chip;
 258         int cbrs, dsrbytes, n;
 259         int order = get_order(sizeof(struct gru_blade_state));
 260         struct page *page;
 261         struct gru_state *gru;
 262         unsigned long paddr;
 263         void *vaddr;
 264
 265         max_user_cbrs = GRU_NUM_CB;
 266         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
 267         for_each_online_node(nid) {
 268                 bid = uv_node_to_blade_id(nid);
 269                 pnode = uv_node_to_pnode(nid);
 270                 if (bid < 0 || gru_base[bid])
 271                         continue;
 272                 page = alloc_pages_exact_node(nid, GFP_KERNEL, order);
 273                 if (!page)
 274                         goto fail;
 275                 gru_base[bid] = page_address(page);
 276                 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
 277                 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
 278                 spin_lock_init(&gru_base[bid]->bs_lock);
 279                 init_rwsem(&gru_base[bid]->bs_kgts_sema);
 280
 281                 dsrbytes = 0;
 282                 cbrs = 0;
 283                 for (gru = gru_base[bid]->bs_grus, chip = 0;
 284                                 chip < GRU_CHIPLETS_PER_BLADE;
 285                                 chip++, gru++) {
 286                         paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
 287                         vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
 288                         gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
 289                         n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
 290                         cbrs = max(cbrs, n);
 291                         n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
 292                         dsrbytes = max(dsrbytes, n);
 293                 }
 294                 max_user_cbrs = min(max_user_cbrs, cbrs);
 295                 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
 296         }
 297
 298         return 0;
 299
 300 fail:
 301         for (nid--; nid >= 0; nid--)
 302                 free_pages((unsigned long)gru_base[nid], order);
 303         return -ENOMEM;
 304 }
 305
 306 #ifdef CONFIG_IA64
 307
 308 static int get_base_irq(void)
 309 {
 310         return IRQ_GRU;
 311 }
 312
 313 #elif defined CONFIG_X86_64
 314
 315 static void noop(unsigned int irq)
 316 {
 317 }
 318
 319 static struct irq_chip gru_chip = {
 320         .name           = "gru",
 321         .mask           = noop,
 322         .unmask         = noop,
 323         .ack            = noop,
 324 };
 325
 326 static int get_base_irq(void)
 327 {
 328         set_irq_chip(IRQ_GRU, &gru_chip);
 329         set_irq_chip(IRQ_GRU + 1, &gru_chip);
 330         return IRQ_GRU;
 331 }
 332 #endif
 333
 334 /*
 335  * gru_init
 336  *
 337  * Called at boot or module load time to initialize the GRUs.
 338  */
 339 static int __init gru_init(void)
 340 {
 341         int ret, irq, chip;
 342         char id[10];
 343
 344         if (!is_uv_system())
 345                 return 0;
 346
 347 #if defined CONFIG_IA64
 348         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
 349 #else
 350         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
 351                                 0x7fffffffffffUL;
 352 #endif
 353         gru_start_vaddr = __va(gru_start_paddr);
 354         gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
 355         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
 356                gru_start_paddr, gru_end_paddr);
 357         irq = get_base_irq();
 358         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
 359                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
 360                 /* TODO: fix irq handling on x86. For now ignore failure because
 361                  * interrupts are not required & not yet fully supported */
 362                 if (ret) {
 363                         printk(KERN_WARNING
 364                                "!!!WARNING: GRU ignoring request failure!!!\n");
 365                         ret = 0;
 366                 }
 367                 if (ret) {
 368                         printk(KERN_ERR "%s: request_irq failed\n",
 369                                GRU_DRIVER_ID_STR);
 370                         goto exit1;
 371                 }
 372         }
 373
 374         ret = misc_register(&gru_miscdev);
 375         if (ret) {
 376                 printk(KERN_ERR "%s: misc_register failed\n",
 377                        GRU_DRIVER_ID_STR);
 378                 goto exit1;
 379         }
 380
 381         ret = gru_proc_init();
 382         if (ret) {
 383                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
 384                 goto exit2;
 385         }
 386
 387         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
 388         if (ret) {
 389                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
 390                 goto exit3;
 391         }
 392         gru_kservices_init();
 393
 394         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
 395                GRU_DRIVER_VERSION_STR);
 396         return 0;
 397
 398 exit3:
 399         gru_proc_exit();
 400 exit2:
 401         misc_deregister(&gru_miscdev);
 402 exit1:
 403         for (--chip; chip >= 0; chip--)
 404                 free_irq(irq + chip, NULL);
 405         return ret;
 406
 407 }
 408
 409 static void __exit gru_exit(void)
 410 {
 411         int i, bid;
 412         int order = get_order(sizeof(struct gru_state) *
 413                               GRU_CHIPLETS_PER_BLADE);
 414
 415         if (!is_uv_system())
 416                 return;
 417
 418         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 419                 free_irq(IRQ_GRU + i, NULL);
 420         gru_kservices_exit();
 421         for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 422                 free_pages((unsigned long)gru_base[bid], order);
 423
 424         misc_deregister(&gru_miscdev);
 425         gru_proc_exit();
 426 }
 427
 428 static const struct file_operations gru_fops = {
 429         .owner          = THIS_MODULE,
 430         .unlocked_ioctl = gru_file_unlocked_ioctl,
 431         .mmap           = gru_file_mmap,
 432 };
 433
 434 static struct miscdevice gru_miscdev = {
 435         .minor          = MISC_DYNAMIC_MINOR,
 436         .name           = "gru",
 437         .fops           = &gru_fops,
 438 };
 439
 440 const struct vm_operations_struct gru_vm_ops = {
 441         .close          = gru_vma_close,
 442         .fault          = gru_fault,
 443 };
 444
 445 #ifndef MODULE
 446 fs_initcall(gru_init);
 447 #else
 448 module_init(gru_init);
 449 #endif
 450 module_exit(gru_exit);
 451
 452 module_param(gru_options, ulong, 0644);
 453 MODULE_PARM_DESC(gru_options, "Various debug options");
 454
 455 MODULE_AUTHOR("Silicon Graphics, Inc.");
 456 MODULE_LICENSE("GPL");
 457 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
 458 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
 459