drm/vmwgfx/vmwgfx_gem.c

0001 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
0002 /*
0003  * Copyright 2021 VMware, Inc.
0004  *
0005  * Permission is hereby granted, free of charge, to any person
0006  * obtaining a copy of this software and associated documentation
0007  * files (the "Software"), to deal in the Software without
0008  * restriction, including without limitation the rights to use, copy,
0009  * modify, merge, publish, distribute, sublicense, and/or sell copies
0010  * of the Software, and to permit persons to whom the Software is
0011  * furnished to do so, subject to the following conditions:
0012  *
0013  * The above copyright notice and this permission notice shall be
0014  * included in all copies or substantial portions of the Software.
0015  *
0016  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0017  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0018  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0019  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0020  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0021  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0022  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0023  * SOFTWARE.
0024  *
0025  */
0026
0027 #include "vmwgfx_drv.h"
0028
0029 #include "drm/drm_prime.h"
0030 #include "drm/drm_gem_ttm_helper.h"
0031
0032 /**
0033  * vmw_buffer_object - Convert a struct ttm_buffer_object to a struct
0034  * vmw_buffer_object.
0035  *
0036  * @bo: Pointer to the TTM buffer object.
0037  * Return: Pointer to the struct vmw_buffer_object embedding the
0038  * TTM buffer object.
0039  */
0040 static struct vmw_buffer_object *
0041 vmw_buffer_object(struct ttm_buffer_object *bo)
0042 {
0043     return container_of(bo, struct vmw_buffer_object, base);
0044 }
0045
0046 static void vmw_gem_object_free(struct drm_gem_object *gobj)
0047 {
0048     struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
0049     if (bo) {
0050         ttm_bo_put(bo);
0051     }
0052 }
0053
0054 static int vmw_gem_object_open(struct drm_gem_object *obj,
0055                    struct drm_file *file_priv)
0056 {
0057     return 0;
0058 }
0059
0060 static void vmw_gem_object_close(struct drm_gem_object *obj,
0061                  struct drm_file *file_priv)
0062 {
0063 }
0064
0065 static int vmw_gem_pin_private(struct drm_gem_object *obj, bool do_pin)
0066 {
0067     struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
0068     struct vmw_buffer_object *vbo = vmw_buffer_object(bo);
0069     int ret;
0070
0071     ret = ttm_bo_reserve(bo, false, false, NULL);
0072     if (unlikely(ret != 0))
0073         goto err;
0074
0075     vmw_bo_pin_reserved(vbo, do_pin);
0076
0077     ttm_bo_unreserve(bo);
0078
0079 err:
0080     return ret;
0081 }
0082
0083
0084 static int vmw_gem_object_pin(struct drm_gem_object *obj)
0085 {
0086     return vmw_gem_pin_private(obj, true);
0087 }
0088
0089 static void vmw_gem_object_unpin(struct drm_gem_object *obj)
0090 {
0091     vmw_gem_pin_private(obj, false);
0092 }
0093
0094 static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
0095 {
0096     struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
0097     struct vmw_ttm_tt *vmw_tt =
0098         container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
0099
0100     if (vmw_tt->vsgt.sgt)
0101         return vmw_tt->vsgt.sgt;
0102
0103     return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
0104 }
0105
0106
0107 static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
0108     .free = vmw_gem_object_free,
0109     .open = vmw_gem_object_open,
0110     .close = vmw_gem_object_close,
0111     .print_info = drm_gem_ttm_print_info,
0112     .pin = vmw_gem_object_pin,
0113     .unpin = vmw_gem_object_unpin,
0114     .get_sg_table = vmw_gem_object_get_sg_table,
0115     .vmap = drm_gem_ttm_vmap,
0116     .vunmap = drm_gem_ttm_vunmap,
0117     .mmap = drm_gem_ttm_mmap,
0118 };
0119
0120 /**
0121  * vmw_gem_destroy - vmw buffer object destructor
0122  *
0123  * @bo: Pointer to the embedded struct ttm_buffer_object
0124  */
0125 void vmw_gem_destroy(struct ttm_buffer_object *bo)
0126 {
0127     struct vmw_buffer_object *vbo = vmw_buffer_object(bo);
0128
0129     WARN_ON(vbo->dirty);
0130     WARN_ON(!RB_EMPTY_ROOT(&vbo->res_tree));
0131     vmw_bo_unmap(vbo);
0132     drm_gem_object_release(&vbo->base.base);
0133     kfree(vbo);
0134 }
0135
0136 int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
0137                       struct drm_file *filp,
0138                       uint32_t size,
0139                       uint32_t *handle,
0140                       struct vmw_buffer_object **p_vbo)
0141 {
0142     int ret;
0143
0144     ret = vmw_bo_create(dev_priv, size,
0145                 (dev_priv->has_mob) ?
0146                     &vmw_sys_placement :
0147                     &vmw_vram_sys_placement,
0148                 true, false, &vmw_gem_destroy, p_vbo);
0149
0150     (*p_vbo)->base.base.funcs = &vmw_gem_object_funcs;
0151     if (ret != 0)
0152         goto out_no_bo;
0153
0154     ret = drm_gem_handle_create(filp, &(*p_vbo)->base.base, handle);
0155     /* drop reference from allocate - handle holds it now */
0156     drm_gem_object_put(&(*p_vbo)->base.base);
0157 out_no_bo:
0158     return ret;
0159 }
0160
0161
0162 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
0163                 struct drm_file *filp)
0164 {
0165     struct vmw_private *dev_priv = vmw_priv(dev);
0166     union drm_vmw_alloc_dmabuf_arg *arg =
0167         (union drm_vmw_alloc_dmabuf_arg *)data;
0168     struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
0169     struct drm_vmw_dmabuf_rep *rep = &arg->rep;
0170     struct vmw_buffer_object *vbo;
0171     uint32_t handle;
0172     int ret;
0173
0174     ret = vmw_gem_object_create_with_handle(dev_priv, filp,
0175                         req->size, &handle, &vbo);
0176     if (ret)
0177         goto out_no_bo;
0178
0179     rep->handle = handle;
0180     rep->map_handle = drm_vma_node_offset_addr(&vbo->base.base.vma_node);
0181     rep->cur_gmr_id = handle;
0182     rep->cur_gmr_offset = 0;
0183 out_no_bo:
0184     return ret;
0185 }
0186
0187 #if defined(CONFIG_DEBUG_FS)
0188
0189 static void vmw_bo_print_info(int id, struct vmw_buffer_object *bo, struct seq_file *m)
0190 {
0191     const char *placement;
0192     const char *type;
0193
0194     switch (bo->base.resource->mem_type) {
0195     case TTM_PL_SYSTEM:
0196         placement = " CPU";
0197         break;
0198     case VMW_PL_GMR:
0199         placement = " GMR";
0200         break;
0201     case VMW_PL_MOB:
0202         placement = " MOB";
0203         break;
0204     case VMW_PL_SYSTEM:
0205         placement = "VCPU";
0206         break;
0207     case TTM_PL_VRAM:
0208         placement = "VRAM";
0209         break;
0210     default:
0211         placement = "None";
0212         break;
0213     }
0214
0215     switch (bo->base.type) {
0216     case ttm_bo_type_device:
0217         type = "device";
0218         break;
0219     case ttm_bo_type_kernel:
0220         type = "kernel";
0221         break;
0222     case ttm_bo_type_sg:
0223         type = "sg    ";
0224         break;
0225     default:
0226         type = "none  ";
0227         break;
0228     }
0229
0230     seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
0231            id, bo->base.base.size, placement, type);
0232     seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
0233            bo->base.priority,
0234            bo->base.pin_count,
0235            kref_read(&bo->base.base.refcount),
0236            kref_read(&bo->base.kref));
0237     seq_puts(m, "\n");
0238 }
0239
0240 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
0241 {
0242     struct vmw_private *vdev = (struct vmw_private *)m->private;
0243     struct drm_device *dev = &vdev->drm;
0244     struct drm_file *file;
0245     int r;
0246
0247     r = mutex_lock_interruptible(&dev->filelist_mutex);
0248     if (r)
0249         return r;
0250
0251     list_for_each_entry(file, &dev->filelist, lhead) {
0252         struct task_struct *task;
0253         struct drm_gem_object *gobj;
0254         int id;
0255
0256         /*
0257          * Although we have a valid reference on file->pid, that does
0258          * not guarantee that the task_struct who called get_pid() is
0259          * still alive (e.g. get_pid(current) => fork() => exit()).
0260          * Therefore, we need to protect this ->comm access using RCU.
0261          */
0262         rcu_read_lock();
0263         task = pid_task(file->pid, PIDTYPE_PID);
0264         seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
0265                task ? task->comm : "<unknown>");
0266         rcu_read_unlock();
0267
0268         spin_lock(&file->table_lock);
0269         idr_for_each_entry(&file->object_idr, gobj, id) {
0270             struct vmw_buffer_object *bo = gem_to_vmw_bo(gobj);
0271
0272             vmw_bo_print_info(id, bo, m);
0273         }
0274         spin_unlock(&file->table_lock);
0275     }
0276
0277     mutex_unlock(&dev->filelist_mutex);
0278     return 0;
0279 }
0280
0281 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
0282
0283 #endif
0284
0285 void vmw_debugfs_gem_init(struct vmw_private *vdev)
0286 {
0287 #if defined(CONFIG_DEBUG_FS)
0288     struct drm_minor *minor = vdev->drm.primary;
0289     struct dentry *root = minor->debugfs_root;
0290
0291     debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
0292                 &vmw_debugfs_gem_info_fops);
0293 #endif
0294 }