linux/drivers/misc/sgi-gru/grufile.c
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   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
  59struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
  60unsigned long gru_start_paddr, gru_end_paddr __read_mostly;
  61struct gru_stats_s gru_stats;
  62
  63/* Guaranteed user available resources on each node */
  64static int max_user_cbrs, max_user_dsr_bytes;
  65
  66static struct file_operations gru_fops;
  67static 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 */
  76static 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 */
 110static 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 */
 137static 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 */
 176static 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 */
 199static 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 */
 236static 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 */
 276static 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
 295static 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
 339fail:
 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
 347static int get_base_irq(void)
 348{
 349        return IRQ_GRU;
 350}
 351
 352#elif defined CONFIG_X86_64
 353
 354static void noop(unsigned int irq)
 355{
 356}
 357
 358static struct irq_chip gru_chip = {
 359        .name           = "gru",
 360        .mask           = noop,
 361        .unmask         = noop,
 362        .ack            = noop,
 363};
 364
 365static 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 */
 378static 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                /* TODO: fix irq handling on x86. For now ignore failures because
 402                 * interrupts are not required & not yet fully supported */
 403                if (ret) {
 404                        printk("!!!WARNING: GRU ignoring request failure!!!\n");
 405                        ret = 0;
 406                }
 407                if (ret) {
 408                        printk(KERN_ERR "%s: request_irq failed\n",
 409                               GRU_DRIVER_ID_STR);
 410                        goto exit1;
 411                }
 412        }
 413
 414        ret = misc_register(&gru_miscdev);
 415        if (ret) {
 416                printk(KERN_ERR "%s: misc_register failed\n",
 417                       GRU_DRIVER_ID_STR);
 418                goto exit1;
 419        }
 420
 421        ret = gru_proc_init();
 422        if (ret) {
 423                printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
 424                goto exit2;
 425        }
 426
 427        ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
 428        if (ret) {
 429                printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
 430                goto exit3;
 431        }
 432
 433        printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
 434               GRU_DRIVER_VERSION_STR);
 435        return 0;
 436
 437exit3:
 438        gru_proc_exit();
 439exit2:
 440        misc_deregister(&gru_miscdev);
 441exit1:
 442        for (--chip; chip >= 0; chip--)
 443                free_irq(irq + chip, NULL);
 444        return ret;
 445
 446}
 447
 448static void __exit gru_exit(void)
 449{
 450        int i, bid;
 451        int order = get_order(sizeof(struct gru_state) *
 452                              GRU_CHIPLETS_PER_BLADE);
 453
 454        if (!IS_UV())
 455                return;
 456
 457        for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 458                free_irq(IRQ_GRU + i, NULL);
 459
 460        for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 461                free_pages((unsigned long)gru_base[bid], order);
 462
 463        misc_deregister(&gru_miscdev);
 464        gru_proc_exit();
 465}
 466
 467static struct file_operations gru_fops = {
 468        .owner          = THIS_MODULE,
 469        .unlocked_ioctl = gru_file_unlocked_ioctl,
 470        .mmap           = gru_file_mmap,
 471};
 472
 473static struct miscdevice gru_miscdev = {
 474        .minor          = MISC_DYNAMIC_MINOR,
 475        .name           = "gru",
 476        .fops           = &gru_fops,
 477};
 478
 479struct vm_operations_struct gru_vm_ops = {
 480        .close          = gru_vma_close,
 481        .fault          = gru_fault,
 482};
 483
 484fs_initcall(gru_init);
 485module_exit(gru_exit);
 486
 487module_param(gru_options, ulong, 0644);
 488MODULE_PARM_DESC(gru_options, "Various debug options");
 489
 490MODULE_AUTHOR("Silicon Graphics, Inc.");
 491MODULE_LICENSE("GPL");
 492MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
 493MODULE_VERSION(GRU_DRIVER_VERSION_STR);
 494
 495