drivers/gpu/drm/vmwgfx/vmwgfx_gem.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /*
   3  * Copyright 2021-2023 VMware, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person
   6  * obtaining a copy of this software and associated documentation
   7  * files (the "Software"), to deal in the Software without
   8  * restriction, including without limitation the rights to use, copy,
   9  * modify, merge, publish, distribute, sublicense, and/or sell copies
  10  * of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  20  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  21  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  */
  26
  27 #include "vmwgfx_bo.h"
  28 #include "vmwgfx_drv.h"
  29
  30 #include "drm/drm_prime.h"
  31 #include "drm/drm_gem_ttm_helper.h"
  32
  33 #include <linux/debugfs.h>
  34
  35 static void vmw_gem_object_free(struct drm_gem_object *gobj)
  36 {
  37         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
  38         if (bo)
  39                 ttm_bo_put(bo);
  40 }
  41
  42 static int vmw_gem_object_open(struct drm_gem_object *obj,
  43                                struct drm_file *file_priv)
  44 {
  45         return 0;
  46 }
  47
  48 static void vmw_gem_object_close(struct drm_gem_object *obj,
  49                                  struct drm_file *file_priv)
  50 {
  51 }
  52
  53 static int vmw_gem_object_pin(struct drm_gem_object *obj)
  54 {
  55         struct vmw_bo *vbo = to_vmw_bo(obj);
  56
  57         vmw_bo_pin_reserved(vbo, true);
  58
  59         return 0;
  60 }
  61
  62 static void vmw_gem_object_unpin(struct drm_gem_object *obj)
  63 {
  64         struct vmw_bo *vbo = to_vmw_bo(obj);
  65
  66         vmw_bo_pin_reserved(vbo, false);
  67 }
  68
  69 static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
  70 {
  71         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
  72         struct vmw_ttm_tt *vmw_tt =
  73                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
  74
  75         if (vmw_tt->vsgt.sgt)
  76                 return vmw_tt->vsgt.sgt;
  77
  78         return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
  79 }
  80
  81 static const struct vm_operations_struct vmw_vm_ops = {
  82         .pfn_mkwrite = vmw_bo_vm_mkwrite,
  83         .page_mkwrite = vmw_bo_vm_mkwrite,
  84         .fault = vmw_bo_vm_fault,
  85         .open = ttm_bo_vm_open,
  86         .close = ttm_bo_vm_close,
  87 };
  88
  89 static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
  90         .free = vmw_gem_object_free,
  91         .open = vmw_gem_object_open,
  92         .close = vmw_gem_object_close,
  93         .print_info = drm_gem_ttm_print_info,
  94         .pin = vmw_gem_object_pin,
  95         .unpin = vmw_gem_object_unpin,
  96         .get_sg_table = vmw_gem_object_get_sg_table,
  97         .vmap = drm_gem_ttm_vmap,
  98         .vunmap = drm_gem_ttm_vunmap,
  99         .mmap = drm_gem_ttm_mmap,
 100         .vm_ops = &vmw_vm_ops,
 101 };
 102
 103 int vmw_gem_object_create(struct vmw_private *vmw,
 104                           struct vmw_bo_params *params,
 105                           struct vmw_bo **p_vbo)
 106 {
 107         int ret = vmw_bo_create(vmw, params, p_vbo);
 108
 109         if (ret != 0)
 110                 goto out_no_bo;
 111
 112         (*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs;
 113 out_no_bo:
 114         return ret;
 115 }
 116
 117 int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
 118                                       struct drm_file *filp,
 119                                       uint32_t size,
 120                                       uint32_t *handle,
 121                                       struct vmw_bo **p_vbo)
 122 {
 123         int ret;
 124         struct vmw_bo_params params = {
 125                 .domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 126                 .busy_domain = VMW_BO_DOMAIN_SYS,
 127                 .bo_type = ttm_bo_type_device,
 128                 .size = size,
 129                 .pin = false
 130         };
 131
 132         ret = vmw_gem_object_create(dev_priv, &params, p_vbo);
 133         if (ret != 0)
 134                 goto out_no_bo;
 135
 136         ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
 137 out_no_bo:
 138         return ret;
 139 }
 140
 141 struct drm_gem_object *vmw_prime_import_sg_table(struct drm_device *dev,
 142                                                  struct dma_buf_attachment *attach,
 143                                                  struct sg_table *table)
 144 {
 145         int ret;
 146         struct vmw_private *dev_priv = vmw_priv(dev);
 147         struct drm_gem_object *gem = NULL;
 148         struct vmw_bo *vbo;
 149         struct vmw_bo_params params = {
 150                 .domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 151                 .busy_domain = VMW_BO_DOMAIN_SYS,
 152                 .bo_type = ttm_bo_type_sg,
 153                 .size = attach->dmabuf->size,
 154                 .pin = false,
 155                 .resv = attach->dmabuf->resv,
 156                 .sg = table,
 157
 158         };
 159
 160         dma_resv_lock(params.resv, NULL);
 161
 162         ret = vmw_bo_create(dev_priv, &params, &vbo);
 163         if (ret != 0)
 164                 goto out_no_bo;
 165
 166         vbo->tbo.base.funcs = &vmw_gem_object_funcs;
 167
 168         gem = &vbo->tbo.base;
 169 out_no_bo:
 170         dma_resv_unlock(params.resv);
 171         return gem;
 172 }
 173
 174 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
 175                                 struct drm_file *filp)
 176 {
 177         struct vmw_private *dev_priv = vmw_priv(dev);
 178         union drm_vmw_alloc_dmabuf_arg *arg =
 179             (union drm_vmw_alloc_dmabuf_arg *)data;
 180         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 181         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 182         struct vmw_bo *vbo;
 183         uint32_t handle;
 184         int ret;
 185
 186         ret = vmw_gem_object_create_with_handle(dev_priv, filp,
 187                                                 req->size, &handle, &vbo);
 188         if (ret)
 189                 goto out_no_bo;
 190
 191         rep->handle = handle;
 192         rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
 193         rep->cur_gmr_id = handle;
 194         rep->cur_gmr_offset = 0;
 195         /* drop reference from allocate - handle holds it now */
 196         drm_gem_object_put(&vbo->tbo.base);
 197 out_no_bo:
 198         return ret;
 199 }
 200
 201 #if defined(CONFIG_DEBUG_FS)
 202
 203 static void vmw_bo_print_info(int id, struct vmw_bo *bo, struct seq_file *m)
 204 {
 205         const char *placement;
 206         const char *type;
 207
 208         switch (bo->tbo.resource->mem_type) {
 209         case TTM_PL_SYSTEM:
 210                 placement = " CPU";
 211                 break;
 212         case VMW_PL_GMR:
 213                 placement = " GMR";
 214                 break;
 215         case VMW_PL_MOB:
 216                 placement = " MOB";
 217                 break;
 218         case VMW_PL_SYSTEM:
 219                 placement = "VCPU";
 220                 break;
 221         case TTM_PL_VRAM:
 222                 placement = "VRAM";
 223                 break;
 224         default:
 225                 placement = "None";
 226                 break;
 227         }
 228
 229         switch (bo->tbo.type) {
 230         case ttm_bo_type_device:
 231                 type = "device";
 232                 break;
 233         case ttm_bo_type_kernel:
 234                 type = "kernel";
 235                 break;
 236         case ttm_bo_type_sg:
 237                 type = "sg    ";
 238                 break;
 239         default:
 240                 type = "none  ";
 241                 break;
 242         }
 243
 244         seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
 245                    id, bo->tbo.base.size, placement, type);
 246         seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
 247                    bo->tbo.priority,
 248                    bo->tbo.pin_count,
 249                    kref_read(&bo->tbo.base.refcount),
 250                    kref_read(&bo->tbo.kref));
 251         seq_puts(m, "\n");
 252 }
 253
 254 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
 255 {
 256         struct vmw_private *vdev = (struct vmw_private *)m->private;
 257         struct drm_device *dev = &vdev->drm;
 258         struct drm_file *file;
 259         int r;
 260
 261         r = mutex_lock_interruptible(&dev->filelist_mutex);
 262         if (r)
 263                 return r;
 264
 265         list_for_each_entry(file, &dev->filelist, lhead) {
 266                 struct task_struct *task;
 267                 struct drm_gem_object *gobj;
 268                 struct pid *pid;
 269                 int id;
 270
 271                 /*
 272                  * Although we have a valid reference on file->pid, that does
 273                  * not guarantee that the task_struct who called get_pid() is
 274                  * still alive (e.g. get_pid(current) => fork() => exit()).
 275                  * Therefore, we need to protect this ->comm access using RCU.
 276                  */
 277                 rcu_read_lock();
 278                 pid = rcu_dereference(file->pid);
 279                 task = pid_task(pid, PIDTYPE_TGID);
 280                 seq_printf(m, "pid %8d command %s:\n", pid_nr(pid),
 281                            task ? task->comm : "<unknown>");
 282                 rcu_read_unlock();
 283
 284                 spin_lock(&file->table_lock);
 285                 idr_for_each_entry(&file->object_idr, gobj, id) {
 286                         struct vmw_bo *bo = to_vmw_bo(gobj);
 287
 288                         vmw_bo_print_info(id, bo, m);
 289                 }
 290                 spin_unlock(&file->table_lock);
 291         }
 292
 293         mutex_unlock(&dev->filelist_mutex);
 294         return 0;
 295 }
 296
 297 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
 298
 299 #endif
 300
 301 void vmw_debugfs_gem_init(struct vmw_private *vdev)
 302 {
 303 #if defined(CONFIG_DEBUG_FS)
 304         struct drm_minor *minor = vdev->drm.primary;
 305         struct dentry *root = minor->debugfs_root;
 306
 307         debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
 308                             &vmw_debugfs_gem_info_fops);
 309 #endif
 310 }