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 file_operations gru_fops; 57 static struct miscdevice gru_miscdev; 58 59 60 /* 61 * gru_vma_close 62 * 63 * Called when unmapping a device mapping. Frees all gru resources 64 * and tables belonging to the vma. 65 */ 66 static void gru_vma_close(struct vm_area_struct *vma) 67 { 68 struct gru_vma_data *vdata; 69 struct gru_thread_state *gts; 70 struct list_head *entry, *next; 71 72 if (!vma->vm_private_data) 73 return; 74 75 vdata = vma->vm_private_data; 76 vma->vm_private_data = NULL; 77 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file, 78 vdata); 79 list_for_each_safe(entry, next, &vdata->vd_head) { 80 gts = 81 list_entry(entry, struct gru_thread_state, ts_next); 82 list_del(>s->ts_next); 83 mutex_lock(>s->ts_ctxlock); 84 if (gts->ts_gru) 85 gru_unload_context(gts, 0); 86 mutex_unlock(>s->ts_ctxlock); 87 gts_drop(gts); 88 } 89 kfree(vdata); 90 STAT(vdata_free); 91 } 92 93 /* 94 * gru_file_mmap 95 * 96 * Called when mmaping the device. Initializes the vma with a fault handler 97 * and private data structure necessary to allocate, track, and free the 98 * underlying pages. 99 */ 100 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma) 101 { 102 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE)) 103 return -EPERM; 104 105 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) || 106 vma->vm_end & (GRU_GSEG_PAGESIZE - 1)) 107 return -EINVAL; 108 109 vma->vm_flags |= 110 (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP | 111 VM_RESERVED); 112 vma->vm_page_prot = PAGE_SHARED; 113 vma->vm_ops = &gru_vm_ops; 114 115 vma->vm_private_data = gru_alloc_vma_data(vma, 0); 116 if (!vma->vm_private_data) 117 return -ENOMEM; 118 119 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n", 120 file, vma->vm_start, vma, vma->vm_private_data); 121 return 0; 122 } 123 124 /* 125 * Create a new GRU context 126 */ 127 static int gru_create_new_context(unsigned long arg) 128 { 129 struct gru_create_context_req req; 130 struct vm_area_struct *vma; 131 struct gru_vma_data *vdata; 132 int ret = -EINVAL; 133 134 135 if (copy_from_user(&req, (void __user *)arg, sizeof(req))) 136 return -EFAULT; 137 138 if (req.data_segment_bytes > max_user_dsr_bytes) 139 return -EINVAL; 140 if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count) 141 return -EINVAL; 142 143 if (!(req.options & GRU_OPT_MISS_MASK)) 144 req.options |= GRU_OPT_MISS_FMM_INTR; 145 146 down_write(¤t->mm->mmap_sem); 147 vma = gru_find_vma(req.gseg); 148 if (vma) { 149 vdata = vma->vm_private_data; 150 vdata->vd_user_options = req.options; 151 vdata->vd_dsr_au_count = 152 GRU_DS_BYTES_TO_AU(req.data_segment_bytes); 153 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks); 154 ret = 0; 155 } 156 up_write(¤t->mm->mmap_sem); 157 158 return ret; 159 } 160 161 /* 162 * Get GRU configuration info (temp - for emulator testing) 163 */ 164 static long gru_get_config_info(unsigned long arg) 165 { 166 struct gru_config_info info; 167 int nodesperblade; 168 169 if (num_online_nodes() > 1 && 170 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0))) 171 nodesperblade = 2; 172 else 173 nodesperblade = 1; 174 info.cpus = num_online_cpus(); 175 info.nodes = num_online_nodes(); 176 info.blades = info.nodes / nodesperblade; 177 info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades; 178 179 if (copy_to_user((void __user *)arg, &info, sizeof(info))) 180 return -EFAULT; 181 return 0; 182 } 183 184 /* 185 * gru_file_unlocked_ioctl 186 * 187 * Called to update file attributes via IOCTL calls. 188 */ 189 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req, 190 unsigned long arg) 191 { 192 int err = -EBADRQC; 193 194 gru_dbg(grudev, "file %p\n", file); 195 196 switch (req) { 197 case GRU_CREATE_CONTEXT: 198 err = gru_create_new_context(arg); 199 break; 200 case GRU_SET_CONTEXT_OPTION: 201 err = gru_set_context_option(arg); 202 break; 203 case GRU_USER_GET_EXCEPTION_DETAIL: 204 err = gru_get_exception_detail(arg); 205 break; 206 case GRU_USER_UNLOAD_CONTEXT: 207 err = gru_user_unload_context(arg); 208 break; 209 case GRU_USER_FLUSH_TLB: 210 err = gru_user_flush_tlb(arg); 211 break; 212 case GRU_USER_CALL_OS: 213 err = gru_handle_user_call_os(arg); 214 break; 215 case GRU_GET_GSEG_STATISTICS: 216 err = gru_get_gseg_statistics(arg); 217 break; 218 case GRU_KTEST: 219 err = gru_ktest(arg); 220 break; 221 case GRU_GET_CONFIG_INFO: 222 err = gru_get_config_info(arg); 223 break; 224 case GRU_DUMP_CHIPLET_STATE: 225 err = gru_dump_chiplet_request(arg); 226 break; 227 } 228 return err; 229 } 230 231 /* 232 * Called at init time to build tables for all GRUs that are present in the 233 * system. 234 */ 235 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, 236 void *vaddr, int nid, int bid, int grunum) 237 { 238 spin_lock_init(&gru->gs_lock); 239 spin_lock_init(&gru->gs_asid_lock); 240 gru->gs_gru_base_paddr = paddr; 241 gru->gs_gru_base_vaddr = vaddr; 242 gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum; 243 gru->gs_blade = gru_base[bid]; 244 gru->gs_blade_id = bid; 245 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; 246 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; 247 gru->gs_asid_limit = MAX_ASID; 248 gru_tgh_flush_init(gru); 249 if (gru->gs_gid >= gru_max_gids) 250 gru_max_gids = gru->gs_gid + 1; 251 gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n", 252 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr, 253 gru->gs_gru_base_paddr); 254 } 255 256 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr) 257 { 258 int pnode, nid, bid, chip; 259 int cbrs, dsrbytes, n; 260 int order = get_order(sizeof(struct gru_blade_state)); 261 struct page *page; 262 struct gru_state *gru; 263 unsigned long paddr; 264 void *vaddr; 265 266 max_user_cbrs = GRU_NUM_CB; 267 max_user_dsr_bytes = GRU_NUM_DSR_BYTES; 268 for_each_online_node(nid) { 269 bid = uv_node_to_blade_id(nid); 270 pnode = uv_node_to_pnode(nid); 271 if (bid < 0 || gru_base[bid]) 272 continue; 273 page = alloc_pages_exact_node(nid, GFP_KERNEL, order); 274 if (!page) 275 goto fail; 276 gru_base[bid] = page_address(page); 277 memset(gru_base[bid], 0, sizeof(struct gru_blade_state)); 278 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0]; 279 spin_lock_init(&gru_base[bid]->bs_lock); 280 init_rwsem(&gru_base[bid]->bs_kgts_sema); 281 282 dsrbytes = 0; 283 cbrs = 0; 284 for (gru = gru_base[bid]->bs_grus, chip = 0; 285 chip < GRU_CHIPLETS_PER_BLADE; 286 chip++, gru++) { 287 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip); 288 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip); 289 gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip); 290 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; 291 cbrs = max(cbrs, n); 292 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; 293 dsrbytes = max(dsrbytes, n); 294 } 295 max_user_cbrs = min(max_user_cbrs, cbrs); 296 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes); 297 } 298 299 return 0; 300 301 fail: 302 for (nid--; nid >= 0; nid--) 303 free_pages((unsigned long)gru_base[nid], order); 304 return -ENOMEM; 305 } 306 307 #ifdef CONFIG_IA64 308 309 static int get_base_irq(void) 310 { 311 return IRQ_GRU; 312 } 313 314 #elif defined CONFIG_X86_64 315 316 static void noop(unsigned int irq) 317 { 318 } 319 320 static struct irq_chip gru_chip = { 321 .name = "gru", 322 .mask = noop, 323 .unmask = noop, 324 .ack = noop, 325 }; 326 327 static int get_base_irq(void) 328 { 329 set_irq_chip(IRQ_GRU, &gru_chip); 330 set_irq_chip(IRQ_GRU + 1, &gru_chip); 331 return IRQ_GRU; 332 } 333 #endif 334 335 /* 336 * gru_init 337 * 338 * Called at boot or module load time to initialize the GRUs. 339 */ 340 static int __init gru_init(void) 341 { 342 int ret, irq, chip; 343 char id[10]; 344 345 if (!is_uv_system()) 346 return 0; 347 348 #if defined CONFIG_IA64 349 gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */ 350 #else 351 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) & 352 0x7fffffffffffUL; 353 #endif 354 gru_start_vaddr = __va(gru_start_paddr); 355 gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE; 356 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", 357 gru_start_paddr, gru_end_paddr); 358 irq = get_base_irq(); 359 for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) { 360 ret = request_irq(irq + chip, gru_intr, 0, id, NULL); 361 /* TODO: fix irq handling on x86. For now ignore failure because 362 * interrupts are not required & not yet fully supported */ 363 if (ret) { 364 printk(KERN_WARNING 365 "!!!WARNING: GRU ignoring request failure!!!\n"); 366 ret = 0; 367 } 368 if (ret) { 369 printk(KERN_ERR "%s: request_irq failed\n", 370 GRU_DRIVER_ID_STR); 371 goto exit1; 372 } 373 } 374 375 ret = misc_register(&gru_miscdev); 376 if (ret) { 377 printk(KERN_ERR "%s: misc_register failed\n", 378 GRU_DRIVER_ID_STR); 379 goto exit1; 380 } 381 382 ret = gru_proc_init(); 383 if (ret) { 384 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); 385 goto exit2; 386 } 387 388 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr); 389 if (ret) { 390 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR); 391 goto exit3; 392 } 393 gru_kservices_init(); 394 395 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, 396 GRU_DRIVER_VERSION_STR); 397 return 0; 398 399 exit3: 400 gru_proc_exit(); 401 exit2: 402 misc_deregister(&gru_miscdev); 403 exit1: 404 for (--chip; chip >= 0; chip--) 405 free_irq(irq + chip, NULL); 406 return ret; 407 408 } 409 410 static void __exit gru_exit(void) 411 { 412 int i, bid; 413 int order = get_order(sizeof(struct gru_state) * 414 GRU_CHIPLETS_PER_BLADE); 415 416 if (!is_uv_system()) 417 return; 418 419 for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++) 420 free_irq(IRQ_GRU + i, NULL); 421 gru_kservices_exit(); 422 for (bid = 0; bid < GRU_MAX_BLADES; bid++) 423 free_pages((unsigned long)gru_base[bid], order); 424 425 misc_deregister(&gru_miscdev); 426 gru_proc_exit(); 427 } 428 429 static struct file_operations gru_fops = { 430 .owner = THIS_MODULE, 431 .unlocked_ioctl = gru_file_unlocked_ioctl, 432 .mmap = gru_file_mmap, 433 }; 434 435 static struct miscdevice gru_miscdev = { 436 .minor = MISC_DYNAMIC_MINOR, 437 .name = "gru", 438 .fops = &gru_fops, 439 }; 440 441 struct vm_operations_struct gru_vm_ops = { 442 .close = gru_vma_close, 443 .fault = gru_fault, 444 }; 445 446 #ifndef MODULE 447 fs_initcall(gru_init); 448 #else 449 module_init(gru_init); 450 #endif 451 module_exit(gru_exit); 452 453 module_param(gru_options, ulong, 0644); 454 MODULE_PARM_DESC(gru_options, "Various debug options"); 455 456 MODULE_AUTHOR("Silicon Graphics, Inc."); 457 MODULE_LICENSE("GPL"); 458 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR); 459 MODULE_VERSION(GRU_DRIVER_VERSION_STR); 460 461