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 static void vmw_gem_object_free(struct drm_gem_object *gobj)
  34 {
  35         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
  36         if (bo)
  37                 ttm_bo_put(bo);
  38 }
  39
  40 static int vmw_gem_object_open(struct drm_gem_object *obj,
  41                                struct drm_file *file_priv)
  42 {
  43         return 0;
  44 }
  45
  46 static void vmw_gem_object_close(struct drm_gem_object *obj,
  47                                  struct drm_file *file_priv)
  48 {
  49 }
  50
  51 static int vmw_gem_pin_private(struct drm_gem_object *obj, bool do_pin)
  52 {
  53         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
  54         struct vmw_bo *vbo = to_vmw_bo(obj);
  55         int ret;
  56
  57         ret = ttm_bo_reserve(bo, false, false, NULL);
  58         if (unlikely(ret != 0))
  59                 goto err;
  60
  61         vmw_bo_pin_reserved(vbo, do_pin);
  62
  63         ttm_bo_unreserve(bo);
  64
  65 err:
  66         return ret;
  67 }
  68
  69
  70 static int vmw_gem_object_pin(struct drm_gem_object *obj)
  71 {
  72         return vmw_gem_pin_private(obj, true);
  73 }
  74
  75 static void vmw_gem_object_unpin(struct drm_gem_object *obj)
  76 {
  77         vmw_gem_pin_private(obj, false);
  78 }
  79
  80 static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
  81 {
  82         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
  83         struct vmw_ttm_tt *vmw_tt =
  84                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
  85
  86         if (vmw_tt->vsgt.sgt)
  87                 return vmw_tt->vsgt.sgt;
  88
  89         return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
  90 }
  91
  92 static const struct vm_operations_struct vmw_vm_ops = {
  93         .pfn_mkwrite = vmw_bo_vm_mkwrite,
  94         .page_mkwrite = vmw_bo_vm_mkwrite,
  95         .fault = vmw_bo_vm_fault,
  96         .open = ttm_bo_vm_open,
  97         .close = ttm_bo_vm_close,
  98 };
  99
 100 static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
 101         .free = vmw_gem_object_free,
 102         .open = vmw_gem_object_open,
 103         .close = vmw_gem_object_close,
 104         .print_info = drm_gem_ttm_print_info,
 105         .pin = vmw_gem_object_pin,
 106         .unpin = vmw_gem_object_unpin,
 107         .get_sg_table = vmw_gem_object_get_sg_table,
 108         .vmap = drm_gem_ttm_vmap,
 109         .vunmap = drm_gem_ttm_vunmap,
 110         .mmap = drm_gem_ttm_mmap,
 111         .vm_ops = &vmw_vm_ops,
 112 };
 113
 114 int vmw_gem_object_create(struct vmw_private *vmw,
 115                           struct vmw_bo_params *params,
 116                           struct vmw_bo **p_vbo)
 117 {
 118         int ret = vmw_bo_create(vmw, params, p_vbo);
 119
 120         if (ret != 0)
 121                 goto out_no_bo;
 122
 123         (*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs;
 124 out_no_bo:
 125         return ret;
 126 }
 127
 128 int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
 129                                       struct drm_file *filp,
 130                                       uint32_t size,
 131                                       uint32_t *handle,
 132                                       struct vmw_bo **p_vbo)
 133 {
 134         int ret;
 135         struct vmw_bo_params params = {
 136                 .domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 137                 .busy_domain = VMW_BO_DOMAIN_SYS,
 138                 .bo_type = ttm_bo_type_device,
 139                 .size = size,
 140                 .pin = false
 141         };
 142
 143         ret = vmw_gem_object_create(dev_priv, &params, p_vbo);
 144         if (ret != 0)
 145                 goto out_no_bo;
 146
 147         ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
 148 out_no_bo:
 149         return ret;
 150 }
 151
 152
 153 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
 154                                 struct drm_file *filp)
 155 {
 156         struct vmw_private *dev_priv = vmw_priv(dev);
 157         union drm_vmw_alloc_dmabuf_arg *arg =
 158             (union drm_vmw_alloc_dmabuf_arg *)data;
 159         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 160         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 161         struct vmw_bo *vbo;
 162         uint32_t handle;
 163         int ret;
 164
 165         ret = vmw_gem_object_create_with_handle(dev_priv, filp,
 166                                                 req->size, &handle, &vbo);
 167         if (ret)
 168                 goto out_no_bo;
 169
 170         rep->handle = handle;
 171         rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
 172         rep->cur_gmr_id = handle;
 173         rep->cur_gmr_offset = 0;
 174         /* drop reference from allocate - handle holds it now */
 175         drm_gem_object_put(&vbo->tbo.base);
 176 out_no_bo:
 177         return ret;
 178 }
 179
 180 #if defined(CONFIG_DEBUG_FS)
 181
 182 static void vmw_bo_print_info(int id, struct vmw_bo *bo, struct seq_file *m)
 183 {
 184         const char *placement;
 185         const char *type;
 186
 187         switch (bo->tbo.resource->mem_type) {
 188         case TTM_PL_SYSTEM:
 189                 placement = " CPU";
 190                 break;
 191         case VMW_PL_GMR:
 192                 placement = " GMR";
 193                 break;
 194         case VMW_PL_MOB:
 195                 placement = " MOB";
 196                 break;
 197         case VMW_PL_SYSTEM:
 198                 placement = "VCPU";
 199                 break;
 200         case TTM_PL_VRAM:
 201                 placement = "VRAM";
 202                 break;
 203         default:
 204                 placement = "None";
 205                 break;
 206         }
 207
 208         switch (bo->tbo.type) {
 209         case ttm_bo_type_device:
 210                 type = "device";
 211                 break;
 212         case ttm_bo_type_kernel:
 213                 type = "kernel";
 214                 break;
 215         case ttm_bo_type_sg:
 216                 type = "sg    ";
 217                 break;
 218         default:
 219                 type = "none  ";
 220                 break;
 221         }
 222
 223         seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
 224                    id, bo->tbo.base.size, placement, type);
 225         seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
 226                    bo->tbo.priority,
 227                    bo->tbo.pin_count,
 228                    kref_read(&bo->tbo.base.refcount),
 229                    kref_read(&bo->tbo.kref));
 230         seq_puts(m, "\n");
 231 }
 232
 233 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
 234 {
 235         struct vmw_private *vdev = (struct vmw_private *)m->private;
 236         struct drm_device *dev = &vdev->drm;
 237         struct drm_file *file;
 238         int r;
 239
 240         r = mutex_lock_interruptible(&dev->filelist_mutex);
 241         if (r)
 242                 return r;
 243
 244         list_for_each_entry(file, &dev->filelist, lhead) {
 245                 struct task_struct *task;
 246                 struct drm_gem_object *gobj;
 247                 int id;
 248
 249                 /*
 250                  * Although we have a valid reference on file->pid, that does
 251                  * not guarantee that the task_struct who called get_pid() is
 252                  * still alive (e.g. get_pid(current) => fork() => exit()).
 253                  * Therefore, we need to protect this ->comm access using RCU.
 254                  */
 255                 rcu_read_lock();
 256                 task = pid_task(file->pid, PIDTYPE_TGID);
 257                 seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
 258                            task ? task->comm : "<unknown>");
 259                 rcu_read_unlock();
 260
 261                 spin_lock(&file->table_lock);
 262                 idr_for_each_entry(&file->object_idr, gobj, id) {
 263                         struct vmw_bo *bo = to_vmw_bo(gobj);
 264
 265                         vmw_bo_print_info(id, bo, m);
 266                 }
 267                 spin_unlock(&file->table_lock);
 268         }
 269
 270         mutex_unlock(&dev->filelist_mutex);
 271         return 0;
 272 }
 273
 274 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
 275
 276 #endif
 277
 278 void vmw_debugfs_gem_init(struct vmw_private *vdev)
 279 {
 280 #if defined(CONFIG_DEBUG_FS)
 281         struct drm_minor *minor = vdev->drm.primary;
 282         struct dentry *root = minor->debugfs_root;
 283
 284         debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
 285                             &vmw_debugfs_gem_info_fops);
 286 #endif
 287 }