drivers/gpu/drm/i915/gvt/dmabuf.c

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