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_with_handle(struct vmw_private *dev_priv,
 115                                       struct drm_file *filp,
 116                                       uint32_t size,
 117                                       uint32_t *handle,
 118                                       struct vmw_bo **p_vbo)
 119 {
 120         int ret;
 121         struct vmw_bo_params params = {
 122                 .domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
 123                 .busy_domain = VMW_BO_DOMAIN_SYS,
 124                 .bo_type = ttm_bo_type_device,
 125                 .size = size,
 126                 .pin = false
 127         };
 128
 129         ret = vmw_bo_create(dev_priv, &params, p_vbo);
 130         if (ret != 0)
 131                 goto out_no_bo;
 132
 133         (*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs;
 134
 135         ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
 136 out_no_bo:
 137         return ret;
 138 }
 139
 140
 141 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
 142                                 struct drm_file *filp)
 143 {
 144         struct vmw_private *dev_priv = vmw_priv(dev);
 145         union drm_vmw_alloc_dmabuf_arg *arg =
 146             (union drm_vmw_alloc_dmabuf_arg *)data;
 147         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 148         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 149         struct vmw_bo *vbo;
 150         uint32_t handle;
 151         int ret;
 152
 153         ret = vmw_gem_object_create_with_handle(dev_priv, filp,
 154                                                 req->size, &handle, &vbo);
 155         if (ret)
 156                 goto out_no_bo;
 157
 158         rep->handle = handle;
 159         rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
 160         rep->cur_gmr_id = handle;
 161         rep->cur_gmr_offset = 0;
 162         /* drop reference from allocate - handle holds it now */
 163         drm_gem_object_put(&vbo->tbo.base);
 164 out_no_bo:
 165         return ret;
 166 }
 167
 168 #if defined(CONFIG_DEBUG_FS)
 169
 170 static void vmw_bo_print_info(int id, struct vmw_bo *bo, struct seq_file *m)
 171 {
 172         const char *placement;
 173         const char *type;
 174
 175         switch (bo->tbo.resource->mem_type) {
 176         case TTM_PL_SYSTEM:
 177                 placement = " CPU";
 178                 break;
 179         case VMW_PL_GMR:
 180                 placement = " GMR";
 181                 break;
 182         case VMW_PL_MOB:
 183                 placement = " MOB";
 184                 break;
 185         case VMW_PL_SYSTEM:
 186                 placement = "VCPU";
 187                 break;
 188         case TTM_PL_VRAM:
 189                 placement = "VRAM";
 190                 break;
 191         default:
 192                 placement = "None";
 193                 break;
 194         }
 195
 196         switch (bo->tbo.type) {
 197         case ttm_bo_type_device:
 198                 type = "device";
 199                 break;
 200         case ttm_bo_type_kernel:
 201                 type = "kernel";
 202                 break;
 203         case ttm_bo_type_sg:
 204                 type = "sg    ";
 205                 break;
 206         default:
 207                 type = "none  ";
 208                 break;
 209         }
 210
 211         seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
 212                    id, bo->tbo.base.size, placement, type);
 213         seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
 214                    bo->tbo.priority,
 215                    bo->tbo.pin_count,
 216                    kref_read(&bo->tbo.base.refcount),
 217                    kref_read(&bo->tbo.kref));
 218         seq_puts(m, "\n");
 219 }
 220
 221 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
 222 {
 223         struct vmw_private *vdev = (struct vmw_private *)m->private;
 224         struct drm_device *dev = &vdev->drm;
 225         struct drm_file *file;
 226         int r;
 227
 228         r = mutex_lock_interruptible(&dev->filelist_mutex);
 229         if (r)
 230                 return r;
 231
 232         list_for_each_entry(file, &dev->filelist, lhead) {
 233                 struct task_struct *task;
 234                 struct drm_gem_object *gobj;
 235                 int id;
 236
 237                 /*
 238                  * Although we have a valid reference on file->pid, that does
 239                  * not guarantee that the task_struct who called get_pid() is
 240                  * still alive (e.g. get_pid(current) => fork() => exit()).
 241                  * Therefore, we need to protect this ->comm access using RCU.
 242                  */
 243                 rcu_read_lock();
 244                 task = pid_task(file->pid, PIDTYPE_TGID);
 245                 seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
 246                            task ? task->comm : "<unknown>");
 247                 rcu_read_unlock();
 248
 249                 spin_lock(&file->table_lock);
 250                 idr_for_each_entry(&file->object_idr, gobj, id) {
 251                         struct vmw_bo *bo = to_vmw_bo(gobj);
 252
 253                         vmw_bo_print_info(id, bo, m);
 254                 }
 255                 spin_unlock(&file->table_lock);
 256         }
 257
 258         mutex_unlock(&dev->filelist_mutex);
 259         return 0;
 260 }
 261
 262 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
 263
 264 #endif
 265
 266 void vmw_debugfs_gem_init(struct vmw_private *vdev)
 267 {
 268 #if defined(CONFIG_DEBUG_FS)
 269         struct drm_minor *minor = vdev->drm.primary;
 270         struct dentry *root = minor->debugfs_root;
 271
 272         debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
 273                             &vmw_debugfs_gem_info_fops);
 274 #endif
 275 }