drivers/gpu/drm/lima/lima_gem.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /* Copyright 2017-2019 Qiang Yu <[email protected]> */
   3
   4 #include <linux/mm.h>
   5 #include <linux/sync_file.h>
   6 #include <linux/pagemap.h>
   7 #include <linux/shmem_fs.h>
   8 #include <linux/dma-mapping.h>
   9
  10 #include <drm/drm_file.h>
  11 #include <drm/drm_syncobj.h>
  12 #include <drm/drm_utils.h>
  13
  14 #include <drm/lima_drm.h>
  15
  16 #include "lima_drv.h"
  17 #include "lima_gem.h"
  18 #include "lima_vm.h"
  19
  20 int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
  21 {
  22         struct page **pages;
  23         struct address_space *mapping = bo->base.base.filp->f_mapping;
  24         struct device *dev = bo->base.base.dev->dev;
  25         size_t old_size = bo->heap_size;
  26         size_t new_size = bo->heap_size ? bo->heap_size * 2 :
  27                 (lima_heap_init_nr_pages << PAGE_SHIFT);
  28         struct sg_table sgt;
  29         int i, ret;
  30
  31         if (bo->heap_size >= bo->base.base.size)
  32                 return -ENOSPC;
  33
  34         new_size = min(new_size, bo->base.base.size);
  35
  36         mutex_lock(&bo->base.pages_lock);
  37
  38         if (bo->base.pages) {
  39                 pages = bo->base.pages;
  40         } else {
  41                 pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
  42                                        sizeof(*pages), GFP_KERNEL | __GFP_ZERO);
  43                 if (!pages) {
  44                         mutex_unlock(&bo->base.pages_lock);
  45                         return -ENOMEM;
  46                 }
  47
  48                 bo->base.pages = pages;
  49                 bo->base.pages_use_count = 1;
  50
  51                 mapping_set_unevictable(mapping);
  52         }
  53
  54         for (i = old_size >> PAGE_SHIFT; i < new_size >> PAGE_SHIFT; i++) {
  55                 struct page *page = shmem_read_mapping_page(mapping, i);
  56
  57                 if (IS_ERR(page)) {
  58                         mutex_unlock(&bo->base.pages_lock);
  59                         return PTR_ERR(page);
  60                 }
  61                 pages[i] = page;
  62         }
  63
  64         mutex_unlock(&bo->base.pages_lock);
  65
  66         ret = sg_alloc_table_from_pages(&sgt, pages, i, 0,
  67                                         new_size, GFP_KERNEL);
  68         if (ret)
  69                 return ret;
  70
  71         if (bo->base.sgt) {
  72                 dma_unmap_sgtable(dev, bo->base.sgt, DMA_BIDIRECTIONAL, 0);
  73                 sg_free_table(bo->base.sgt);
  74         } else {
  75                 bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL);
  76                 if (!bo->base.sgt) {
  77                         sg_free_table(&sgt);
  78                         return -ENOMEM;
  79                 }
  80         }
  81
  82         ret = dma_map_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
  83         if (ret) {
  84                 sg_free_table(&sgt);
  85                 kfree(bo->base.sgt);
  86                 bo->base.sgt = NULL;
  87                 return ret;
  88         }
  89
  90         *bo->base.sgt = sgt;
  91
  92         if (vm) {
  93                 ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT);
  94                 if (ret)
  95                         return ret;
  96         }
  97
  98         bo->heap_size = new_size;
  99         return 0;
 100 }
 101
 102 int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
 103                            u32 size, u32 flags, u32 *handle)
 104 {
 105         int err;
 106         gfp_t mask;
 107         struct drm_gem_shmem_object *shmem;
 108         struct drm_gem_object *obj;
 109         struct lima_bo *bo;
 110         bool is_heap = flags & LIMA_BO_FLAG_HEAP;
 111
 112         shmem = drm_gem_shmem_create(dev, size);
 113         if (IS_ERR(shmem))
 114                 return PTR_ERR(shmem);
 115
 116         obj = &shmem->base;
 117
 118         /* Mali Utgard GPU can only support 32bit address space */
 119         mask = mapping_gfp_mask(obj->filp->f_mapping);
 120         mask &= ~__GFP_HIGHMEM;
 121         mask |= __GFP_DMA32;
 122         mapping_set_gfp_mask(obj->filp->f_mapping, mask);
 123
 124         if (is_heap) {
 125                 bo = to_lima_bo(obj);
 126                 err = lima_heap_alloc(bo, NULL);
 127                 if (err)
 128                         goto out;
 129         } else {
 130                 struct sg_table *sgt = drm_gem_shmem_get_pages_sgt(obj);
 131
 132                 if (IS_ERR(sgt)) {
 133                         err = PTR_ERR(sgt);
 134                         goto out;
 135                 }
 136         }
 137
 138         err = drm_gem_handle_create(file, obj, handle);
 139
 140 out:
 141         /* drop reference from allocate - handle holds it now */
 142         drm_gem_object_put(obj);
 143
 144         return err;
 145 }
 146
 147 static void lima_gem_free_object(struct drm_gem_object *obj)
 148 {
 149         struct lima_bo *bo = to_lima_bo(obj);
 150
 151         if (!list_empty(&bo->va))
 152                 dev_err(obj->dev->dev, "lima gem free bo still has va\n");
 153
 154         drm_gem_shmem_free_object(obj);
 155 }
 156
 157 static int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
 158 {
 159         struct lima_bo *bo = to_lima_bo(obj);
 160         struct lima_drm_priv *priv = to_lima_drm_priv(file);
 161         struct lima_vm *vm = priv->vm;
 162
 163         return lima_vm_bo_add(vm, bo, true);
 164 }
 165
 166 static void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
 167 {
 168         struct lima_bo *bo = to_lima_bo(obj);
 169         struct lima_drm_priv *priv = to_lima_drm_priv(file);
 170         struct lima_vm *vm = priv->vm;
 171
 172         lima_vm_bo_del(vm, bo);
 173 }
 174
 175 static int lima_gem_pin(struct drm_gem_object *obj)
 176 {
 177         struct lima_bo *bo = to_lima_bo(obj);
 178
 179         if (bo->heap_size)
 180                 return -EINVAL;
 181
 182         return drm_gem_shmem_pin(obj);
 183 }
 184
 185 static void *lima_gem_vmap(struct drm_gem_object *obj)
 186 {
 187         struct lima_bo *bo = to_lima_bo(obj);
 188
 189         if (bo->heap_size)
 190                 return ERR_PTR(-EINVAL);
 191
 192         return drm_gem_shmem_vmap(obj);
 193 }
 194
 195 static int lima_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 196 {
 197         struct lima_bo *bo = to_lima_bo(obj);
 198
 199         if (bo->heap_size)
 200                 return -EINVAL;
 201
 202         return drm_gem_shmem_mmap(obj, vma);
 203 }
 204
 205 static const struct drm_gem_object_funcs lima_gem_funcs = {
 206         .free = lima_gem_free_object,
 207         .open = lima_gem_object_open,
 208         .close = lima_gem_object_close,
 209         .print_info = drm_gem_shmem_print_info,
 210         .pin = lima_gem_pin,
 211         .unpin = drm_gem_shmem_unpin,
 212         .get_sg_table = drm_gem_shmem_get_sg_table,
 213         .vmap = lima_gem_vmap,
 214         .vunmap = drm_gem_shmem_vunmap,
 215         .mmap = lima_gem_mmap,
 216 };
 217
 218 struct drm_gem_object *lima_gem_create_object(struct drm_device *dev, size_t size)
 219 {
 220         struct lima_bo *bo;
 221
 222         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 223         if (!bo)
 224                 return NULL;
 225
 226         mutex_init(&bo->lock);
 227         INIT_LIST_HEAD(&bo->va);
 228
 229         bo->base.base.funcs = &lima_gem_funcs;
 230
 231         return &bo->base.base;
 232 }
 233
 234 int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
 235 {
 236         struct drm_gem_object *obj;
 237         struct lima_bo *bo;
 238         struct lima_drm_priv *priv = to_lima_drm_priv(file);
 239         struct lima_vm *vm = priv->vm;
 240
 241         obj = drm_gem_object_lookup(file, handle);
 242         if (!obj)
 243                 return -ENOENT;
 244
 245         bo = to_lima_bo(obj);
 246
 247         *va = lima_vm_get_va(vm, bo);
 248
 249         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 250
 251         drm_gem_object_put(obj);
 252         return 0;
 253 }
 254
 255 static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
 256                             bool write, bool explicit)
 257 {
 258         int err = 0;
 259
 260         if (!write) {
 261                 err = dma_resv_reserve_shared(lima_bo_resv(bo), 1);
 262                 if (err)
 263                         return err;
 264         }
 265
 266         /* explicit sync use user passed dep fence */
 267         if (explicit)
 268                 return 0;
 269
 270         return drm_gem_fence_array_add_implicit(&task->deps, &bo->base.base, write);
 271 }
 272
 273 static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
 274 {
 275         int i, err;
 276
 277         for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
 278                 struct dma_fence *fence = NULL;
 279
 280                 if (!submit->in_sync[i])
 281                         continue;
 282
 283                 err = drm_syncobj_find_fence(file, submit->in_sync[i],
 284                                              0, 0, &fence);
 285                 if (err)
 286                         return err;
 287
 288                 err = drm_gem_fence_array_add(&submit->task->deps, fence);
 289                 if (err) {
 290                         dma_fence_put(fence);
 291                         return err;
 292                 }
 293         }
 294
 295         return 0;
 296 }
 297
 298 int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
 299 {
 300         int i, err = 0;
 301         struct ww_acquire_ctx ctx;
 302         struct lima_drm_priv *priv = to_lima_drm_priv(file);
 303         struct lima_vm *vm = priv->vm;
 304         struct drm_syncobj *out_sync = NULL;
 305         struct dma_fence *fence;
 306         struct lima_bo **bos = submit->lbos;
 307
 308         if (submit->out_sync) {
 309                 out_sync = drm_syncobj_find(file, submit->out_sync);
 310                 if (!out_sync)
 311                         return -ENOENT;
 312         }
 313
 314         for (i = 0; i < submit->nr_bos; i++) {
 315                 struct drm_gem_object *obj;
 316                 struct lima_bo *bo;
 317
 318                 obj = drm_gem_object_lookup(file, submit->bos[i].handle);
 319                 if (!obj) {
 320                         err = -ENOENT;
 321                         goto err_out0;
 322                 }
 323
 324                 bo = to_lima_bo(obj);
 325
 326                 /* increase refcnt of gpu va map to prevent unmapped when executing,
 327                  * will be decreased when task done
 328                  */
 329                 err = lima_vm_bo_add(vm, bo, false);
 330                 if (err) {
 331                         drm_gem_object_put(obj);
 332                         goto err_out0;
 333                 }
 334
 335                 bos[i] = bo;
 336         }
 337
 338         err = drm_gem_lock_reservations((struct drm_gem_object **)bos,
 339                                         submit->nr_bos, &ctx);
 340         if (err)
 341                 goto err_out0;
 342
 343         err = lima_sched_task_init(
 344                 submit->task, submit->ctx->context + submit->pipe,
 345                 bos, submit->nr_bos, vm);
 346         if (err)
 347                 goto err_out1;
 348
 349         err = lima_gem_add_deps(file, submit);
 350         if (err)
 351                 goto err_out2;
 352
 353         for (i = 0; i < submit->nr_bos; i++) {
 354                 err = lima_gem_sync_bo(
 355                         submit->task, bos[i],
 356                         submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
 357                         submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
 358                 if (err)
 359                         goto err_out2;
 360         }
 361
 362         fence = lima_sched_context_queue_task(
 363                 submit->ctx->context + submit->pipe, submit->task);
 364
 365         for (i = 0; i < submit->nr_bos; i++) {
 366                 if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
 367                         dma_resv_add_excl_fence(lima_bo_resv(bos[i]), fence);
 368                 else
 369                         dma_resv_add_shared_fence(lima_bo_resv(bos[i]), fence);
 370         }
 371
 372         drm_gem_unlock_reservations((struct drm_gem_object **)bos,
 373                                     submit->nr_bos, &ctx);
 374
 375         for (i = 0; i < submit->nr_bos; i++)
 376                 drm_gem_object_put(&bos[i]->base.base);
 377
 378         if (out_sync) {
 379                 drm_syncobj_replace_fence(out_sync, fence);
 380                 drm_syncobj_put(out_sync);
 381         }
 382
 383         dma_fence_put(fence);
 384
 385         return 0;
 386
 387 err_out2:
 388         lima_sched_task_fini(submit->task);
 389 err_out1:
 390         drm_gem_unlock_reservations((struct drm_gem_object **)bos,
 391                                     submit->nr_bos, &ctx);
 392 err_out0:
 393         for (i = 0; i < submit->nr_bos; i++) {
 394                 if (!bos[i])
 395                         break;
 396                 lima_vm_bo_del(vm, bos[i]);
 397                 drm_gem_object_put(&bos[i]->base.base);
 398         }
 399         if (out_sync)
 400                 drm_syncobj_put(out_sync);
 401         return err;
 402 }
 403
 404 int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
 405 {
 406         bool write = op & LIMA_GEM_WAIT_WRITE;
 407         long ret, timeout;
 408
 409         if (!op)
 410                 return 0;
 411
 412         timeout = drm_timeout_abs_to_jiffies(timeout_ns);
 413
 414         ret = drm_gem_dma_resv_wait(file, handle, write, timeout);
 415         if (ret == -ETIME)
 416                 ret = timeout ? -ETIMEDOUT : -EBUSY;
 417
 418         return ret;
 419 }