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(>s->ts_next); 82 mutex_lock(>s->ts_ctxlock); 83 if (gts->ts_gru) 84 gru_unload_context(gts, 0); 85 mutex_unlock(>s->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 mmaping 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(¤t->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(¤t->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); 459 460