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