1 /* 2 * Copyright 2017 Intel Corporation. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: 24 * Zhiyuan Lv <zhiyuan.lv@intel.com> 25 * 26 * Contributors: 27 * Xiaoguang Chen 28 * Tina Zhang <tina.zhang@intel.com> 29 */ 30 31 #include <linux/dma-buf.h> 32 #include <linux/vfio.h> 33 34 #include "i915_drv.h" 35 #include "gvt.h" 36 37 #define GEN8_DECODE_PTE(pte) (pte & GENMASK_ULL(63, 12)) 38 39 static int vgpu_gem_get_pages( 40 struct drm_i915_gem_object *obj) 41 { 42 struct drm_i915_private *dev_priv = to_i915(obj->base.dev); 43 struct sg_table *st; 44 struct scatterlist *sg; 45 int i, ret; 46 gen8_pte_t __iomem *gtt_entries; 47 struct intel_vgpu_fb_info *fb_info; 48 49 fb_info = (struct intel_vgpu_fb_info *)obj->gvt_info; 50 if (WARN_ON(!fb_info)) 51 return -ENODEV; 52 53 st = kmalloc(sizeof(*st), GFP_KERNEL); 54 if (unlikely(!st)) 55 return -ENOMEM; 56 57 ret = sg_alloc_table(st, fb_info->size, GFP_KERNEL); 58 if (ret) { 59 kfree(st); 60 return ret; 61 } 62 gtt_entries = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + 63 (fb_info->start >> PAGE_SHIFT); 64 for_each_sg(st->sgl, sg, fb_info->size, i) { 65 sg->offset = 0; 66 sg->length = PAGE_SIZE; 67 sg_dma_address(sg) = 68 GEN8_DECODE_PTE(readq(>t_entries[i])); 69 sg_dma_len(sg) = PAGE_SIZE; 70 } 71 72 __i915_gem_object_set_pages(obj, st, PAGE_SIZE); 73 74 return 0; 75 } 76 77 static void vgpu_gem_put_pages(struct drm_i915_gem_object *obj, 78 struct sg_table *pages) 79 { 80 sg_free_table(pages); 81 kfree(pages); 82 } 83 84 static void dmabuf_gem_object_free(struct kref *kref) 85 { 86 struct intel_vgpu_dmabuf_obj *obj = 87 container_of(kref, struct intel_vgpu_dmabuf_obj, kref); 88 struct intel_vgpu *vgpu = obj->vgpu; 89 struct list_head *pos; 90 struct intel_vgpu_dmabuf_obj *dmabuf_obj; 91 92 if (vgpu && vgpu->active && !list_empty(&vgpu->dmabuf_obj_list_head)) { 93 list_for_each(pos, &vgpu->dmabuf_obj_list_head) { 94 dmabuf_obj = container_of(pos, 95 struct intel_vgpu_dmabuf_obj, list); 96 if (dmabuf_obj == obj) { 97 intel_gvt_hypervisor_put_vfio_device(vgpu); 98 idr_remove(&vgpu->object_idr, 99 dmabuf_obj->dmabuf_id); 100 kfree(dmabuf_obj->info); 101 kfree(dmabuf_obj); 102 list_del(pos); 103 break; 104 } 105 } 106 } else { 107 /* Free the orphan dmabuf_objs here */ 108 kfree(obj->info); 109 kfree(obj); 110 } 111 } 112 113 114 static inline void dmabuf_obj_get(struct intel_vgpu_dmabuf_obj *obj) 115 { 116 kref_get(&obj->kref); 117 } 118 119 static inline void dmabuf_obj_put(struct intel_vgpu_dmabuf_obj *obj) 120 { 121 kref_put(&obj->kref, dmabuf_gem_object_free); 122 } 123 124 static void vgpu_gem_release(struct drm_i915_gem_object *gem_obj) 125 { 126 127 struct intel_vgpu_fb_info *fb_info = gem_obj->gvt_info; 128 struct intel_vgpu_dmabuf_obj *obj = fb_info->obj; 129 struct intel_vgpu *vgpu = obj->vgpu; 130 131 if (vgpu) { 132 mutex_lock(&vgpu->dmabuf_lock); 133 gem_obj->base.dma_buf = NULL; 134 dmabuf_obj_put(obj); 135 mutex_unlock(&vgpu->dmabuf_lock); 136 } else { 137 /* vgpu is NULL, as it has been removed already */ 138 gem_obj->base.dma_buf = NULL; 139 dmabuf_obj_put(obj); 140 } 141 } 142 143 static const struct drm_i915_gem_object_ops intel_vgpu_gem_ops = { 144 .flags = I915_GEM_OBJECT_IS_PROXY, 145 .get_pages = vgpu_gem_get_pages, 146 .put_pages = vgpu_gem_put_pages, 147 .release = vgpu_gem_release, 148 }; 149 150 static struct drm_i915_gem_object *vgpu_create_gem(struct drm_device *dev, 151 struct intel_vgpu_fb_info *info) 152 { 153 struct drm_i915_private *dev_priv = to_i915(dev); 154 struct drm_i915_gem_object *obj; 155 156 obj = i915_gem_object_alloc(dev_priv); 157 if (obj == NULL) 158 return NULL; 159 160 drm_gem_private_object_init(dev, &obj->base, 161 info->size << PAGE_SHIFT); 162 i915_gem_object_init(obj, &intel_vgpu_gem_ops); 163 164 obj->read_domains = I915_GEM_DOMAIN_GTT; 165 obj->write_domain = 0; 166 if (INTEL_GEN(dev_priv) >= 9) { 167 unsigned int tiling_mode = 0; 168 unsigned int stride = 0; 169 170 switch (info->drm_format_mod) { 171 case DRM_FORMAT_MOD_LINEAR: 172 tiling_mode = I915_TILING_NONE; 173 break; 174 case I915_FORMAT_MOD_X_TILED: 175 tiling_mode = I915_TILING_X; 176 stride = info->stride; 177 break; 178 case I915_FORMAT_MOD_Y_TILED: 179 case I915_FORMAT_MOD_Yf_TILED: 180 tiling_mode = I915_TILING_Y; 181 stride = info->stride; 182 break; 183 default: 184 gvt_dbg_core("invalid drm_format_mod %llx for tiling\n", 185 info->drm_format_mod); 186 } 187 obj->tiling_and_stride = tiling_mode | stride; 188 } else { 189 obj->tiling_and_stride = info->drm_format_mod ? 190 I915_TILING_X : 0; 191 } 192 193 return obj; 194 } 195 196 static bool validate_hotspot(struct intel_vgpu_cursor_plane_format *c) 197 { 198 if (c && c->x_hot <= c->width && c->y_hot <= c->height) 199 return true; 200 else 201 return false; 202 } 203 204 static int vgpu_get_plane_info(struct drm_device *dev, 205 struct intel_vgpu *vgpu, 206 struct intel_vgpu_fb_info *info, 207 int plane_id) 208 { 209 struct drm_i915_private *dev_priv = to_i915(dev); 210 struct intel_vgpu_primary_plane_format p; 211 struct intel_vgpu_cursor_plane_format c; 212 int ret; 213 214 if (plane_id == DRM_PLANE_TYPE_PRIMARY) { 215 ret = intel_vgpu_decode_primary_plane(vgpu, &p); 216 if (ret) 217 return ret; 218 info->start = p.base; 219 info->start_gpa = p.base_gpa; 220 info->width = p.width; 221 info->height = p.height; 222 info->stride = p.stride; 223 info->drm_format = p.drm_format; 224 225 switch (p.tiled) { 226 case PLANE_CTL_TILED_LINEAR: 227 info->drm_format_mod = DRM_FORMAT_MOD_LINEAR; 228 break; 229 case PLANE_CTL_TILED_X: 230 info->drm_format_mod = I915_FORMAT_MOD_X_TILED; 231 break; 232 case PLANE_CTL_TILED_Y: 233 info->drm_format_mod = I915_FORMAT_MOD_Y_TILED; 234 break; 235 case PLANE_CTL_TILED_YF: 236 info->drm_format_mod = I915_FORMAT_MOD_Yf_TILED; 237 break; 238 default: 239 gvt_vgpu_err("invalid tiling mode: %x\n", p.tiled); 240 } 241 242 info->size = (((p.stride * p.height * p.bpp) / 8) + 243 (PAGE_SIZE - 1)) >> PAGE_SHIFT; 244 } else if (plane_id == DRM_PLANE_TYPE_CURSOR) { 245 ret = intel_vgpu_decode_cursor_plane(vgpu, &c); 246 if (ret) 247 return ret; 248 info->start = c.base; 249 info->start_gpa = c.base_gpa; 250 info->width = c.width; 251 info->height = c.height; 252 info->stride = c.width * (c.bpp / 8); 253 info->drm_format = c.drm_format; 254 info->drm_format_mod = 0; 255 info->x_pos = c.x_pos; 256 info->y_pos = c.y_pos; 257 258 if (validate_hotspot(&c)) { 259 info->x_hot = c.x_hot; 260 info->y_hot = c.y_hot; 261 } else { 262 info->x_hot = UINT_MAX; 263 info->y_hot = UINT_MAX; 264 } 265 266 info->size = (((info->stride * c.height * c.bpp) / 8) 267 + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 268 } else { 269 gvt_vgpu_err("invalid plane id:%d\n", plane_id); 270 return -EINVAL; 271 } 272 273 if (info->size == 0) { 274 gvt_vgpu_err("fb size is zero\n"); 275 return -EINVAL; 276 } 277 278 if (info->start & (PAGE_SIZE - 1)) { 279 gvt_vgpu_err("Not aligned fb address:0x%llx\n", info->start); 280 return -EFAULT; 281 } 282 if (((info->start >> PAGE_SHIFT) + info->size) > 283 ggtt_total_entries(&dev_priv->ggtt)) { 284 gvt_vgpu_err("Invalid GTT offset or size\n"); 285 return -EFAULT; 286 } 287 288 if (!intel_gvt_ggtt_validate_range(vgpu, info->start, info->size)) { 289 gvt_vgpu_err("invalid gma addr\n"); 290 return -EFAULT; 291 } 292 293 return 0; 294 } 295 296 static struct intel_vgpu_dmabuf_obj * 297 pick_dmabuf_by_info(struct intel_vgpu *vgpu, 298 struct intel_vgpu_fb_info *latest_info) 299 { 300 struct list_head *pos; 301 struct intel_vgpu_fb_info *fb_info; 302 struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL; 303 struct intel_vgpu_dmabuf_obj *ret = NULL; 304 305 list_for_each(pos, &vgpu->dmabuf_obj_list_head) { 306 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj, 307 list); 308 if ((dmabuf_obj == NULL) || 309 (dmabuf_obj->info == NULL)) 310 continue; 311 312 fb_info = (struct intel_vgpu_fb_info *)dmabuf_obj->info; 313 if ((fb_info->start == latest_info->start) && 314 (fb_info->start_gpa == latest_info->start_gpa) && 315 (fb_info->size == latest_info->size) && 316 (fb_info->drm_format_mod == latest_info->drm_format_mod) && 317 (fb_info->drm_format == latest_info->drm_format) && 318 (fb_info->width == latest_info->width) && 319 (fb_info->height == latest_info->height)) { 320 ret = dmabuf_obj; 321 break; 322 } 323 } 324 325 return ret; 326 } 327 328 static struct intel_vgpu_dmabuf_obj * 329 pick_dmabuf_by_num(struct intel_vgpu *vgpu, u32 id) 330 { 331 struct list_head *pos; 332 struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL; 333 struct intel_vgpu_dmabuf_obj *ret = NULL; 334 335 list_for_each(pos, &vgpu->dmabuf_obj_list_head) { 336 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj, 337 list); 338 if (!dmabuf_obj) 339 continue; 340 341 if (dmabuf_obj->dmabuf_id == id) { 342 ret = dmabuf_obj; 343 break; 344 } 345 } 346 347 return ret; 348 } 349 350 static void update_fb_info(struct vfio_device_gfx_plane_info *gvt_dmabuf, 351 struct intel_vgpu_fb_info *fb_info) 352 { 353 gvt_dmabuf->drm_format = fb_info->drm_format; 354 gvt_dmabuf->drm_format_mod = fb_info->drm_format_mod; 355 gvt_dmabuf->width = fb_info->width; 356 gvt_dmabuf->height = fb_info->height; 357 gvt_dmabuf->stride = fb_info->stride; 358 gvt_dmabuf->size = fb_info->size; 359 gvt_dmabuf->x_pos = fb_info->x_pos; 360 gvt_dmabuf->y_pos = fb_info->y_pos; 361 gvt_dmabuf->x_hot = fb_info->x_hot; 362 gvt_dmabuf->y_hot = fb_info->y_hot; 363 } 364 365 int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args) 366 { 367 struct drm_device *dev = &vgpu->gvt->dev_priv->drm; 368 struct vfio_device_gfx_plane_info *gfx_plane_info = args; 369 struct intel_vgpu_dmabuf_obj *dmabuf_obj; 370 struct intel_vgpu_fb_info fb_info; 371 int ret = 0; 372 373 if (gfx_plane_info->flags == (VFIO_GFX_PLANE_TYPE_DMABUF | 374 VFIO_GFX_PLANE_TYPE_PROBE)) 375 return ret; 376 else if ((gfx_plane_info->flags & ~VFIO_GFX_PLANE_TYPE_DMABUF) || 377 (!gfx_plane_info->flags)) 378 return -EINVAL; 379 380 ret = vgpu_get_plane_info(dev, vgpu, &fb_info, 381 gfx_plane_info->drm_plane_type); 382 if (ret != 0) 383 goto out; 384 385 mutex_lock(&vgpu->dmabuf_lock); 386 /* If exists, pick up the exposed dmabuf_obj */ 387 dmabuf_obj = pick_dmabuf_by_info(vgpu, &fb_info); 388 if (dmabuf_obj) { 389 update_fb_info(gfx_plane_info, &fb_info); 390 gfx_plane_info->dmabuf_id = dmabuf_obj->dmabuf_id; 391 392 /* This buffer may be released between query_plane ioctl and 393 * get_dmabuf ioctl. Add the refcount to make sure it won't 394 * be released between the two ioctls. 395 */ 396 if (!dmabuf_obj->initref) { 397 dmabuf_obj->initref = true; 398 dmabuf_obj_get(dmabuf_obj); 399 } 400 ret = 0; 401 gvt_dbg_dpy("vgpu%d: re-use dmabuf_obj ref %d, id %d\n", 402 vgpu->id, kref_read(&dmabuf_obj->kref), 403 gfx_plane_info->dmabuf_id); 404 mutex_unlock(&vgpu->dmabuf_lock); 405 goto out; 406 } 407 408 mutex_unlock(&vgpu->dmabuf_lock); 409 410 /* Need to allocate a new one*/ 411 dmabuf_obj = kmalloc(sizeof(struct intel_vgpu_dmabuf_obj), GFP_KERNEL); 412 if (unlikely(!dmabuf_obj)) { 413 gvt_vgpu_err("alloc dmabuf_obj failed\n"); 414 ret = -ENOMEM; 415 goto out; 416 } 417 418 dmabuf_obj->info = kmalloc(sizeof(struct intel_vgpu_fb_info), 419 GFP_KERNEL); 420 if (unlikely(!dmabuf_obj->info)) { 421 gvt_vgpu_err("allocate intel vgpu fb info failed\n"); 422 ret = -ENOMEM; 423 goto out_free_dmabuf; 424 } 425 memcpy(dmabuf_obj->info, &fb_info, sizeof(struct intel_vgpu_fb_info)); 426 427 ((struct intel_vgpu_fb_info *)dmabuf_obj->info)->obj = dmabuf_obj; 428 429 dmabuf_obj->vgpu = vgpu; 430 431 ret = idr_alloc(&vgpu->object_idr, dmabuf_obj, 1, 0, GFP_NOWAIT); 432 if (ret < 0) 433 goto out_free_info; 434 gfx_plane_info->dmabuf_id = ret; 435 dmabuf_obj->dmabuf_id = ret; 436 437 dmabuf_obj->initref = true; 438 439 kref_init(&dmabuf_obj->kref); 440 441 mutex_lock(&vgpu->dmabuf_lock); 442 if (intel_gvt_hypervisor_get_vfio_device(vgpu)) { 443 gvt_vgpu_err("get vfio device failed\n"); 444 mutex_unlock(&vgpu->dmabuf_lock); 445 goto out_free_info; 446 } 447 mutex_unlock(&vgpu->dmabuf_lock); 448 449 update_fb_info(gfx_plane_info, &fb_info); 450 451 INIT_LIST_HEAD(&dmabuf_obj->list); 452 mutex_lock(&vgpu->dmabuf_lock); 453 list_add_tail(&dmabuf_obj->list, &vgpu->dmabuf_obj_list_head); 454 mutex_unlock(&vgpu->dmabuf_lock); 455 456 gvt_dbg_dpy("vgpu%d: %s new dmabuf_obj ref %d, id %d\n", vgpu->id, 457 __func__, kref_read(&dmabuf_obj->kref), ret); 458 459 return 0; 460 461 out_free_info: 462 kfree(dmabuf_obj->info); 463 out_free_dmabuf: 464 kfree(dmabuf_obj); 465 out: 466 /* ENODEV means plane isn't ready, which might be a normal case. */ 467 return (ret == -ENODEV) ? 0 : ret; 468 } 469 470 /* To associate an exposed dmabuf with the dmabuf_obj */ 471 int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id) 472 { 473 struct drm_device *dev = &vgpu->gvt->dev_priv->drm; 474 struct intel_vgpu_dmabuf_obj *dmabuf_obj; 475 struct drm_i915_gem_object *obj; 476 struct dma_buf *dmabuf; 477 int dmabuf_fd; 478 int ret = 0; 479 480 mutex_lock(&vgpu->dmabuf_lock); 481 482 dmabuf_obj = pick_dmabuf_by_num(vgpu, dmabuf_id); 483 if (dmabuf_obj == NULL) { 484 gvt_vgpu_err("invalid dmabuf id:%d\n", dmabuf_id); 485 ret = -EINVAL; 486 goto out; 487 } 488 489 obj = vgpu_create_gem(dev, dmabuf_obj->info); 490 if (obj == NULL) { 491 gvt_vgpu_err("create gvt gem obj failed\n"); 492 ret = -ENOMEM; 493 goto out; 494 } 495 496 obj->gvt_info = dmabuf_obj->info; 497 498 dmabuf = i915_gem_prime_export(dev, &obj->base, DRM_CLOEXEC | DRM_RDWR); 499 if (IS_ERR(dmabuf)) { 500 gvt_vgpu_err("export dma-buf failed\n"); 501 ret = PTR_ERR(dmabuf); 502 goto out_free_gem; 503 } 504 505 i915_gem_object_put(obj); 506 507 ret = dma_buf_fd(dmabuf, DRM_CLOEXEC | DRM_RDWR); 508 if (ret < 0) { 509 gvt_vgpu_err("create dma-buf fd failed ret:%d\n", ret); 510 goto out_free_dmabuf; 511 } 512 dmabuf_fd = ret; 513 514 dmabuf_obj_get(dmabuf_obj); 515 516 if (dmabuf_obj->initref) { 517 dmabuf_obj->initref = false; 518 dmabuf_obj_put(dmabuf_obj); 519 } 520 521 mutex_unlock(&vgpu->dmabuf_lock); 522 523 gvt_dbg_dpy("vgpu%d: dmabuf:%d, dmabuf ref %d, fd:%d\n" 524 " file count: %ld, GEM ref: %d\n", 525 vgpu->id, dmabuf_obj->dmabuf_id, 526 kref_read(&dmabuf_obj->kref), 527 dmabuf_fd, 528 file_count(dmabuf->file), 529 kref_read(&obj->base.refcount)); 530 531 return dmabuf_fd; 532 533 out_free_dmabuf: 534 dma_buf_put(dmabuf); 535 out_free_gem: 536 i915_gem_object_put(obj); 537 out: 538 mutex_unlock(&vgpu->dmabuf_lock); 539 return ret; 540 } 541 542 void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu) 543 { 544 struct list_head *pos, *n; 545 struct intel_vgpu_dmabuf_obj *dmabuf_obj; 546 547 mutex_lock(&vgpu->dmabuf_lock); 548 list_for_each_safe(pos, n, &vgpu->dmabuf_obj_list_head) { 549 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj, 550 list); 551 dmabuf_obj->vgpu = NULL; 552 553 idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id); 554 intel_gvt_hypervisor_put_vfio_device(vgpu); 555 list_del(pos); 556 557 /* dmabuf_obj might be freed in dmabuf_obj_put */ 558 if (dmabuf_obj->initref) { 559 dmabuf_obj->initref = false; 560 dmabuf_obj_put(dmabuf_obj); 561 } 562 563 } 564 mutex_unlock(&vgpu->dmabuf_lock); 565 } 566