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 <asm/uv/uv.h>
  40 #include "gru.h"
  41 #include "grulib.h"
  42 #include "grutables.h"
  43
  44 #include <asm/uv/uv_hub.h>
  45 #include <asm/uv/uv_mmrs.h>
  46
  47 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
  48 unsigned long gru_start_paddr __read_mostly;
  49 void *gru_start_vaddr __read_mostly;
  50 unsigned long gru_end_paddr __read_mostly;
  51 unsigned int gru_max_gids __read_mostly;
  52 struct gru_stats_s gru_stats;
  53
  54 /* Guaranteed user available resources on each node */
  55 static int max_user_cbrs, max_user_dsr_bytes;
  56
  57 static struct file_operations gru_fops;
  58 static struct miscdevice gru_miscdev;
  59
  60
  61 /*
  62  * gru_vma_close
  63  *
  64  * Called when unmapping a device mapping. Frees all gru resources
  65  * and tables belonging to the vma.
  66  */
  67 static void gru_vma_close(struct vm_area_struct *vma)
  68 {
  69         struct gru_vma_data *vdata;
  70         struct gru_thread_state *gts;
  71         struct list_head *entry, *next;
  72
  73         if (!vma->vm_private_data)
  74                 return;
  75
  76         vdata = vma->vm_private_data;
  77         vma->vm_private_data = NULL;
  78         gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
  79                                 vdata);
  80         list_for_each_safe(entry, next, &vdata->vd_head) {
  81                 gts =
  82                     list_entry(entry, struct gru_thread_state, ts_next);
  83                 list_del(&gts->ts_next);
  84                 mutex_lock(&gts->ts_ctxlock);
  85                 if (gts->ts_gru)
  86                         gru_unload_context(gts, 0);
  87                 mutex_unlock(&gts->ts_ctxlock);
  88                 gts_drop(gts);
  89         }
  90         kfree(vdata);
  91         STAT(vdata_free);
  92 }
  93
  94 /*
  95  * gru_file_mmap
  96  *
  97  * Called when mmaping the device.  Initializes the vma with a fault handler
  98  * and private data structure necessary to allocate, track, and free the
  99  * underlying pages.
 100  */
 101 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
 102 {
 103         if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
 104                 return -EPERM;
 105
 106         if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
 107                                 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
 108                 return -EINVAL;
 109
 110         vma->vm_flags |=
 111             (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
 112                         VM_RESERVED);
 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
 136         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 137                 return -EFAULT;
 138
 139         if (req.data_segment_bytes > max_user_dsr_bytes)
 140                 return -EINVAL;
 141         if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
 142                 return -EINVAL;
 143
 144         if (!(req.options & GRU_OPT_MISS_MASK))
 145                 req.options |= GRU_OPT_MISS_FMM_INTR;
 146
 147         down_write(&current->mm->mmap_sem);
 148         vma = gru_find_vma(req.gseg);
 149         if (vma) {
 150                 vdata = vma->vm_private_data;
 151                 vdata->vd_user_options = req.options;
 152                 vdata->vd_dsr_au_count =
 153                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
 154                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
 155                 ret = 0;
 156         }
 157         up_write(&current->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         info.cpus = num_online_cpus();
 176         info.nodes = num_online_nodes();
 177         info.blades = info.nodes / nodesperblade;
 178         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
 179
 180         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 181                 return -EFAULT;
 182         return 0;
 183 }
 184
 185 /*
 186  * gru_file_unlocked_ioctl
 187  *
 188  * Called to update file attributes via IOCTL calls.
 189  */
 190 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
 191                                     unsigned long arg)
 192 {
 193         int err = -EBADRQC;
 194
 195         gru_dbg(grudev, "file %p\n", file);
 196
 197         switch (req) {
 198         case GRU_CREATE_CONTEXT:
 199                 err = gru_create_new_context(arg);
 200                 break;
 201         case GRU_SET_CONTEXT_OPTION:
 202                 err = gru_set_context_option(arg);
 203                 break;
 204         case GRU_USER_GET_EXCEPTION_DETAIL:
 205                 err = gru_get_exception_detail(arg);
 206                 break;
 207         case GRU_USER_UNLOAD_CONTEXT:
 208                 err = gru_user_unload_context(arg);
 209                 break;
 210         case GRU_USER_FLUSH_TLB:
 211                 err = gru_user_flush_tlb(arg);
 212                 break;
 213         case GRU_USER_CALL_OS:
 214                 err = gru_handle_user_call_os(arg);
 215                 break;
 216         case GRU_GET_GSEG_STATISTICS:
 217                 err = gru_get_gseg_statistics(arg);
 218                 break;
 219         case GRU_KTEST:
 220                 err = gru_ktest(arg);
 221                 break;
 222         case GRU_GET_CONFIG_INFO:
 223                 err = gru_get_config_info(arg);
 224                 break;
 225         case GRU_DUMP_CHIPLET_STATE:
 226                 err = gru_dump_chiplet_request(arg);
 227                 break;
 228         }
 229         return err;
 230 }
 231
 232 /*
 233  * Called at init time to build tables for all GRUs that are present in the
 234  * system.
 235  */
 236 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
 237                              void *vaddr, int nid, int bid, int grunum)
 238 {
 239         spin_lock_init(&gru->gs_lock);
 240         spin_lock_init(&gru->gs_asid_lock);
 241         gru->gs_gru_base_paddr = paddr;
 242         gru->gs_gru_base_vaddr = vaddr;
 243         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
 244         gru->gs_blade = gru_base[bid];
 245         gru->gs_blade_id = bid;
 246         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
 247         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
 248         gru->gs_asid_limit = MAX_ASID;
 249         gru_tgh_flush_init(gru);
 250         if (gru->gs_gid >= gru_max_gids)
 251                 gru_max_gids = gru->gs_gid + 1;
 252         gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
 253                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
 254                 gru->gs_gru_base_paddr);
 255 }
 256
 257 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
 258 {
 259         int pnode, nid, bid, chip;
 260         int cbrs, dsrbytes, n;
 261         int order = get_order(sizeof(struct gru_blade_state));
 262         struct page *page;
 263         struct gru_state *gru;
 264         unsigned long paddr;
 265         void *vaddr;
 266
 267         max_user_cbrs = GRU_NUM_CB;
 268         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
 269         for_each_online_node(nid) {
 270                 bid = uv_node_to_blade_id(nid);
 271                 pnode = uv_node_to_pnode(nid);
 272                 if (bid < 0 || gru_base[bid])
 273                         continue;
 274                 page = alloc_pages_exact_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, nid, 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 (nid--; nid >= 0; nid--)
 304                 free_pages((unsigned long)gru_base[nid], order);
 305         return -ENOMEM;
 306 }
 307
 308 #ifdef CONFIG_IA64
 309
 310 static int get_base_irq(void)
 311 {
 312         return IRQ_GRU;
 313 }
 314
 315 #elif defined CONFIG_X86_64
 316
 317 static void noop(unsigned int irq)
 318 {
 319 }
 320
 321 static struct irq_chip gru_chip = {
 322         .name           = "gru",
 323         .mask           = noop,
 324         .unmask         = noop,
 325         .ack            = noop,
 326 };
 327
 328 static int get_base_irq(void)
 329 {
 330         set_irq_chip(IRQ_GRU, &gru_chip);
 331         set_irq_chip(IRQ_GRU + 1, &gru_chip);
 332         return IRQ_GRU;
 333 }
 334 #endif
 335
 336 /*
 337  * gru_init
 338  *
 339  * Called at boot or module load time to initialize the GRUs.
 340  */
 341 static int __init gru_init(void)
 342 {
 343         int ret, irq, chip;
 344         char id[10];
 345
 346         if (!is_uv_system())
 347                 return 0;
 348
 349 #if defined CONFIG_IA64
 350         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
 351 #else
 352         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
 353                                 0x7fffffffffffUL;
 354 #endif
 355         gru_start_vaddr = __va(gru_start_paddr);
 356         gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
 357         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
 358                gru_start_paddr, gru_end_paddr);
 359         irq = get_base_irq();
 360         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
 361                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
 362                 /* TODO: fix irq handling on x86. For now ignore failure because
 363                  * interrupts are not required & not yet fully supported */
 364                 if (ret) {
 365                         printk(KERN_WARNING
 366                                "!!!WARNING: GRU ignoring request failure!!!\n");
 367                         ret = 0;
 368                 }
 369                 if (ret) {
 370                         printk(KERN_ERR "%s: request_irq failed\n",
 371                                GRU_DRIVER_ID_STR);
 372                         goto exit1;
 373                 }
 374         }
 375
 376         ret = misc_register(&gru_miscdev);
 377         if (ret) {
 378                 printk(KERN_ERR "%s: misc_register failed\n",
 379                        GRU_DRIVER_ID_STR);
 380                 goto exit1;
 381         }
 382
 383         ret = gru_proc_init();
 384         if (ret) {
 385                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
 386                 goto exit2;
 387         }
 388
 389         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
 390         if (ret) {
 391                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
 392                 goto exit3;
 393         }
 394         gru_kservices_init();
 395
 396         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
 397                GRU_DRIVER_VERSION_STR);
 398         return 0;
 399
 400 exit3:
 401         gru_proc_exit();
 402 exit2:
 403         misc_deregister(&gru_miscdev);
 404 exit1:
 405         for (--chip; chip >= 0; chip--)
 406                 free_irq(irq + chip, NULL);
 407         return ret;
 408
 409 }
 410
 411 static void __exit gru_exit(void)
 412 {
 413         int i, bid;
 414         int order = get_order(sizeof(struct gru_state) *
 415                               GRU_CHIPLETS_PER_BLADE);
 416
 417         if (!is_uv_system())
 418                 return;
 419
 420         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 421                 free_irq(IRQ_GRU + i, NULL);
 422         gru_kservices_exit();
 423         for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 424                 free_pages((unsigned long)gru_base[bid], order);
 425
 426         misc_deregister(&gru_miscdev);
 427         gru_proc_exit();
 428 }
 429
 430 static struct file_operations gru_fops = {
 431         .owner          = THIS_MODULE,
 432         .unlocked_ioctl = gru_file_unlocked_ioctl,
 433         .mmap           = gru_file_mmap,
 434 };
 435
 436 static struct miscdevice gru_miscdev = {
 437         .minor          = MISC_DYNAMIC_MINOR,
 438         .name           = "gru",
 439         .fops           = &gru_fops,
 440 };
 441
 442 struct vm_operations_struct gru_vm_ops = {
 443         .close          = gru_vma_close,
 444         .fault          = gru_fault,
 445 };
 446
 447 #ifndef MODULE
 448 fs_initcall(gru_init);
 449 #else
 450 module_init(gru_init);
 451 #endif
 452 module_exit(gru_exit);
 453
 454 module_param(gru_options, ulong, 0644);
 455 MODULE_PARM_DESC(gru_options, "Various debug options");
 456
 457 MODULE_AUTHOR("Silicon Graphics, Inc.");
 458 MODULE_LICENSE("GPL");
 459 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
 460 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
 461