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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 | /************************************************************************** * * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ /* * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> */ #define pr_fmt(fmt) "[TTM] " fmt #include <ttm/ttm_module.h> #include <ttm/ttm_bo_driver.h> #include <ttm/ttm_placement.h> #include <drm/drm_vma_manager.h> #include <linux/mm.h> #include <linux/pfn_t.h> #include <linux/rbtree.h> #include <linux/module.h> #include <linux/uaccess.h> #define TTM_BO_VM_NUM_PREFAULT 16 static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, struct vm_area_struct *vma, struct vm_fault *vmf) { int ret = 0; if (likely(!bo->moving)) goto out_unlock; /* * Quick non-stalling check for idle. */ if (fence_is_signaled(bo->moving)) goto out_clear; /* * If possible, avoid waiting for GPU with mmap_sem * held. */ if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { ret = VM_FAULT_RETRY; if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) goto out_unlock; ttm_bo_reference(bo); up_read(&vma->vm_mm->mmap_sem); (void) fence_wait(bo->moving, true); ttm_bo_unreserve(bo); ttm_bo_unref(&bo); goto out_unlock; } /* * Ordinary wait. */ ret = fence_wait(bo->moving, true); if (unlikely(ret != 0)) { ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : VM_FAULT_NOPAGE; goto out_unlock; } out_clear: fence_put(bo->moving); bo->moving = NULL; out_unlock: return ret; } static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct ttm_buffer_object *bo = (struct ttm_buffer_object *) vma->vm_private_data; struct ttm_bo_device *bdev = bo->bdev; unsigned long page_offset; unsigned long page_last; unsigned long pfn; struct ttm_tt *ttm = NULL; struct page *page; int ret; int i; unsigned long address = (unsigned long)vmf->virtual_address; int retval = VM_FAULT_NOPAGE; struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type]; struct vm_area_struct cvma; /* * Work around locking order reversal in fault / nopfn * between mmap_sem and bo_reserve: Perform a trylock operation * for reserve, and if it fails, retry the fault after waiting * for the buffer to become unreserved. */ ret = ttm_bo_reserve(bo, true, true, NULL); if (unlikely(ret != 0)) { if (ret != -EBUSY) return VM_FAULT_NOPAGE; if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { ttm_bo_reference(bo); up_read(&vma->vm_mm->mmap_sem); (void) ttm_bo_wait_unreserved(bo); ttm_bo_unref(&bo); } return VM_FAULT_RETRY; } /* * If we'd want to change locking order to * mmap_sem -> bo::reserve, we'd use a blocking reserve here * instead of retrying the fault... */ return VM_FAULT_NOPAGE; } /* * Refuse to fault imported pages. This should be handled * (if at all) by redirecting mmap to the exporter. */ if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) { retval = VM_FAULT_SIGBUS; goto out_unlock; } if (bdev->driver->fault_reserve_notify) { ret = bdev->driver->fault_reserve_notify(bo); switch (ret) { case 0: break; case -EBUSY: case -ERESTARTSYS: retval = VM_FAULT_NOPAGE; goto out_unlock; default: retval = VM_FAULT_SIGBUS; goto out_unlock; } } /* * Wait for buffer data in transit, due to a pipelined * move. */ ret = ttm_bo_vm_fault_idle(bo, vma, vmf); if (unlikely(ret != 0)) { retval = ret; if (retval == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { /* The BO has already been unreserved. */ return retval; } goto out_unlock; } ret = ttm_mem_io_lock(man, true); if (unlikely(ret != 0)) { retval = VM_FAULT_NOPAGE; goto out_unlock; } ret = ttm_mem_io_reserve_vm(bo); if (unlikely(ret != 0)) { retval = VM_FAULT_SIGBUS; goto out_io_unlock; } page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); page_last = vma_pages(vma) + vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); if (unlikely(page_offset >= bo->num_pages)) { retval = VM_FAULT_SIGBUS; goto out_io_unlock; } /* * Make a local vma copy to modify the page_prot member * and vm_flags if necessary. The vma parameter is protected * by mmap_sem in write mode. */ cvma = *vma; cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); if (bo->mem.bus.is_iomem) { cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, cvma.vm_page_prot); } else { ttm = bo->ttm; cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, cvma.vm_page_prot); /* Allocate all page at once, most common usage */ if (ttm->bdev->driver->ttm_tt_populate(ttm)) { retval = VM_FAULT_OOM; goto out_io_unlock; } } /* * Speculatively prefault a number of pages. Only error on * first page. */ for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { if (bo->mem.bus.is_iomem) pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; else { page = ttm->pages[page_offset]; if (unlikely(!page && i == 0)) { retval = VM_FAULT_OOM; goto out_io_unlock; } else if (unlikely(!page)) { break; } page->mapping = vma->vm_file->f_mapping; page->index = drm_vma_node_start(&bo->vma_node) + page_offset; pfn = page_to_pfn(page); } if (vma->vm_flags & VM_MIXEDMAP) ret = vm_insert_mixed(&cvma, address, __pfn_to_pfn_t(pfn, PFN_DEV)); else ret = vm_insert_pfn(&cvma, address, pfn); /* * Somebody beat us to this PTE or prefaulting to * an already populated PTE, or prefaulting error. */ if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) break; else if (unlikely(ret != 0)) { retval = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; goto out_io_unlock; } address += PAGE_SIZE; if (unlikely(++page_offset >= page_last)) break; } out_io_unlock: ttm_mem_io_unlock(man); out_unlock: ttm_bo_unreserve(bo); return retval; } static void ttm_bo_vm_open(struct vm_area_struct *vma) { struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); (void)ttm_bo_reference(bo); } static void ttm_bo_vm_close(struct vm_area_struct *vma) { struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; ttm_bo_unref(&bo); vma->vm_private_data = NULL; } static const struct vm_operations_struct ttm_bo_vm_ops = { .fault = ttm_bo_vm_fault, .open = ttm_bo_vm_open, .close = ttm_bo_vm_close }; static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, unsigned long offset, unsigned long pages) { struct drm_vma_offset_node *node; struct ttm_buffer_object *bo = NULL; drm_vma_offset_lock_lookup(&bdev->vma_manager); node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); if (likely(node)) { bo = container_of(node, struct ttm_buffer_object, vma_node); if (!kref_get_unless_zero(&bo->kref)) bo = NULL; } drm_vma_offset_unlock_lookup(&bdev->vma_manager); if (!bo) pr_err("Could not find buffer object to map\n"); return bo; } int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, struct ttm_bo_device *bdev) { struct ttm_bo_driver *driver; struct ttm_buffer_object *bo; int ret; bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); if (unlikely(!bo)) return -EINVAL; driver = bo->bdev->driver; if (unlikely(!driver->verify_access)) { ret = -EPERM; goto out_unref; } ret = driver->verify_access(bo, filp); if (unlikely(ret != 0)) goto out_unref; vma->vm_ops = &ttm_bo_vm_ops; /* * Note: We're transferring the bo reference to * vma->vm_private_data here. */ vma->vm_private_data = bo; /* * We'd like to use VM_PFNMAP on shared mappings, where * (vma->vm_flags & VM_SHARED) != 0, for performance reasons, * but for some reason VM_PFNMAP + x86 PAT + write-combine is very * bad for performance. Until that has been sorted out, use * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719 */ vma->vm_flags |= VM_MIXEDMAP; vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; return 0; out_unref: ttm_bo_unref(&bo); return ret; } EXPORT_SYMBOL(ttm_bo_mmap); int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) { if (vma->vm_pgoff != 0) return -EACCES; vma->vm_ops = &ttm_bo_vm_ops; vma->vm_private_data = ttm_bo_reference(bo); vma->vm_flags |= VM_MIXEDMAP; vma->vm_flags |= VM_IO | VM_DONTEXPAND; return 0; } EXPORT_SYMBOL(ttm_fbdev_mmap); |