vmwgfx_gem.c

  1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
  2/*
  3 * Copyright (c) 2021-2024 Broadcom. All Rights Reserved. The term
  4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
  5 *
  6 * Permission is hereby granted, free of charge, to any person
  7 * obtaining a copy of this software and associated documentation
  8 * files (the "Software"), to deal in the Software without
  9 * restriction, including without limitation the rights to use, copy,
 10 * modify, merge, publish, distribute, sublicense, and/or sell copies
 11 * of the Software, and to permit persons to whom the Software is
 12 * furnished to do so, subject to the following conditions:
 13 *
 14 * The above copyright notice and this permission notice shall be
 15 * included in all copies or substantial portions of the Software.
 16 *
 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 21 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 24 * SOFTWARE.
 25 *
 26 */
 27
 28#include "vmwgfx_bo.h"
 29#include "vmwgfx_drv.h"
 30
 31#include "drm/drm_prime.h"
 32#include "drm/drm_gem_ttm_helper.h"
 33
 34#include <linux/debugfs.h>
 35
 36static void vmw_gem_object_free(struct drm_gem_object *gobj)
 37{
 38	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
 39	if (bo)
 40		ttm_bo_fini(bo);
 41}
 42
 43static int vmw_gem_object_open(struct drm_gem_object *obj,
 44			       struct drm_file *file_priv)
 45{
 46	return 0;
 47}
 48
 49static void vmw_gem_object_close(struct drm_gem_object *obj,
 50				 struct drm_file *file_priv)
 51{
 52}
 53
 54static int vmw_gem_object_pin(struct drm_gem_object *obj)
 55{
 56	struct vmw_bo *vbo = to_vmw_bo(obj);
 57
 58	vmw_bo_pin_reserved(vbo, true);
 59
 60	return 0;
 61}
 62
 63static void vmw_gem_object_unpin(struct drm_gem_object *obj)
 64{
 65	struct vmw_bo *vbo = to_vmw_bo(obj);
 66
 67	vmw_bo_pin_reserved(vbo, false);
 68}
 69
 70static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
 71{
 72	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 73	struct vmw_ttm_tt *vmw_tt =
 74		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);
 75
 76	if (vmw_tt->vsgt.sgt)
 77		return vmw_tt->vsgt.sgt;
 78
 79	return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
 80}
 81
 82static int vmw_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
 83{
 84	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 85	int ret;
 86
 87	if (drm_gem_is_imported(obj)) {
 88		ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
 89		if (!ret) {
 90			if (drm_WARN_ON(obj->dev, map->is_iomem)) {
 91				dma_buf_vunmap(obj->import_attach->dmabuf, map);
 92				return -EIO;
 93			}
 94		}
 95	} else {
 96		ret = ttm_bo_vmap(bo, map);
 97	}
 98
 99	return ret;
100}
101
102static void vmw_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
103{
104	if (drm_gem_is_imported(obj))
105		dma_buf_vunmap(obj->import_attach->dmabuf, map);
106	else
107		drm_gem_ttm_vunmap(obj, map);
108}
109
110static int vmw_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
111{
112	int ret;
113
114	if (drm_gem_is_imported(obj)) {
115		/*
116		 * Reset both vm_ops and vm_private_data, so we don't end up with
117		 * vm_ops pointing to our implementation if the dma-buf backend
118		 * doesn't set those fields.
119		 */
120		vma->vm_private_data = NULL;
121		vma->vm_ops = NULL;
122
123		ret = dma_buf_mmap(obj->dma_buf, vma, 0);
124
125		/* Drop the reference drm_gem_mmap_obj() acquired.*/
126		if (!ret)
127			drm_gem_object_put(obj);
128
129		return ret;
130	}
131
132	return drm_gem_ttm_mmap(obj, vma);
133}
134
135static const struct vm_operations_struct vmw_vm_ops = {
136	.pfn_mkwrite = vmw_bo_vm_mkwrite,
137	.page_mkwrite = vmw_bo_vm_mkwrite,
138	.fault = vmw_bo_vm_fault,
139	.open = ttm_bo_vm_open,
140	.close = ttm_bo_vm_close,
141};
142
143const struct drm_gem_object_funcs vmw_gem_object_funcs = {
144	.free = vmw_gem_object_free,
145	.open = vmw_gem_object_open,
146	.close = vmw_gem_object_close,
147	.print_info = drm_gem_ttm_print_info,
148	.pin = vmw_gem_object_pin,
149	.unpin = vmw_gem_object_unpin,
150	.get_sg_table = vmw_gem_object_get_sg_table,
151	.vmap = vmw_gem_vmap,
152	.vunmap = vmw_gem_vunmap,
153	.mmap = vmw_gem_mmap,
154	.vm_ops = &vmw_vm_ops,
155};
156
157int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
158				      struct drm_file *filp,
159				      uint32_t size,
160				      uint32_t *handle,
161				      struct vmw_bo **p_vbo)
162{
163	int ret;
164	struct vmw_bo_params params = {
165		.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
166		.busy_domain = VMW_BO_DOMAIN_SYS,
167		.bo_type = ttm_bo_type_device,
168		.size = size,
169		.pin = false
170	};
171
172	ret = vmw_bo_create(dev_priv, &params, p_vbo);
173	if (ret != 0)
174		goto out_no_bo;
175
176	ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle);
177out_no_bo:
178	return ret;
179}
180
181struct drm_gem_object *vmw_prime_import_sg_table(struct drm_device *dev,
182						 struct dma_buf_attachment *attach,
183						 struct sg_table *table)
184{
185	int ret;
186	struct vmw_private *dev_priv = vmw_priv(dev);
187	struct drm_gem_object *gem = NULL;
188	struct vmw_bo *vbo;
189	struct vmw_bo_params params = {
190		.domain = (dev_priv->has_mob) ? VMW_BO_DOMAIN_SYS : VMW_BO_DOMAIN_VRAM,
191		.busy_domain = VMW_BO_DOMAIN_SYS,
192		.bo_type = ttm_bo_type_sg,
193		.size = attach->dmabuf->size,
194		.pin = false,
195		.keep_resv = true,
196		.resv = attach->dmabuf->resv,
197		.sg = table,
198
199	};
200
201	dma_resv_lock(params.resv, NULL);
202
203	ret = vmw_bo_create(dev_priv, &params, &vbo);
204	if (ret != 0)
205		goto out_no_bo;
206
207	vbo->tbo.base.funcs = &vmw_gem_object_funcs;
208
209	gem = &vbo->tbo.base;
210out_no_bo:
211	dma_resv_unlock(params.resv);
212	return gem;
213}
214
215int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
216				struct drm_file *filp)
217{
218	struct vmw_private *dev_priv = vmw_priv(dev);
219	union drm_vmw_alloc_dmabuf_arg *arg =
220	    (union drm_vmw_alloc_dmabuf_arg *)data;
221	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
222	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
223	struct vmw_bo *vbo;
224	uint32_t handle;
225	int ret;
226
227	ret = vmw_gem_object_create_with_handle(dev_priv, filp,
228						req->size, &handle, &vbo);
229	if (ret)
230		goto out_no_bo;
231
232	rep->handle = handle;
233	rep->map_handle = drm_vma_node_offset_addr(&vbo->tbo.base.vma_node);
234	rep->cur_gmr_id = handle;
235	rep->cur_gmr_offset = 0;
236	/* drop reference from allocate - handle holds it now */
237	drm_gem_object_put(&vbo->tbo.base);
238out_no_bo:
239	return ret;
240}
241
242#if defined(CONFIG_DEBUG_FS)
243
244static void vmw_bo_print_info(int id, struct vmw_bo *bo, struct seq_file *m)
245{
246	const char *placement;
247	const char *type;
248
249	switch (bo->tbo.resource->mem_type) {
250	case TTM_PL_SYSTEM:
251		placement = " CPU";
252		break;
253	case VMW_PL_GMR:
254		placement = " GMR";
255		break;
256	case VMW_PL_MOB:
257		placement = " MOB";
258		break;
259	case VMW_PL_SYSTEM:
260		placement = "VCPU";
261		break;
262	case TTM_PL_VRAM:
263		placement = "VRAM";
264		break;
265	default:
266		placement = "None";
267		break;
268	}
269
270	switch (bo->tbo.type) {
271	case ttm_bo_type_device:
272		type = "device";
273		break;
274	case ttm_bo_type_kernel:
275		type = "kernel";
276		break;
277	case ttm_bo_type_sg:
278		type = "sg    ";
279		break;
280	default:
281		type = "none  ";
282		break;
283	}
284
285	seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
286		   id, bo->tbo.base.size, placement, type);
287	seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d",
288		   bo->tbo.priority,
289		   bo->tbo.pin_count,
290		   kref_read(&bo->tbo.base.refcount));
291	seq_puts(m, "\n");
292}
293
294static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
295{
296	struct vmw_private *vdev = (struct vmw_private *)m->private;
297	struct drm_device *dev = &vdev->drm;
298	struct drm_file *file;
299	int r;
300
301	r = mutex_lock_interruptible(&dev->filelist_mutex);
302	if (r)
303		return r;
304
305	list_for_each_entry(file, &dev->filelist, lhead) {
306		struct task_struct *task;
307		struct drm_gem_object *gobj;
308		struct pid *pid;
309		int id;
310
311		/*
312		 * Although we have a valid reference on file->pid, that does
313		 * not guarantee that the task_struct who called get_pid() is
314		 * still alive (e.g. get_pid(current) => fork() => exit()).
315		 * Therefore, we need to protect this ->comm access using RCU.
316		 */
317		rcu_read_lock();
318		pid = rcu_dereference(file->pid);
319		task = pid_task(pid, PIDTYPE_TGID);
320		seq_printf(m, "pid %8d command %s:\n", pid_nr(pid),
321			   task ? task->comm : "<unknown>");
322		rcu_read_unlock();
323
324		spin_lock(&file->table_lock);
325		idr_for_each_entry(&file->object_idr, gobj, id) {
326			struct vmw_bo *bo = to_vmw_bo(gobj);
327
328			vmw_bo_print_info(id, bo, m);
329		}
330		spin_unlock(&file->table_lock);
331	}
332
333	mutex_unlock(&dev->filelist_mutex);
334	return 0;
335}
336
337DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
338
339#endif
340
341void vmw_debugfs_gem_init(struct vmw_private *vdev)
342{
343#if defined(CONFIG_DEBUG_FS)
344	struct drm_minor *minor = vdev->drm.primary;
345	struct dentry *root = minor->debugfs_root;
346
347	debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
348			    &vmw_debugfs_gem_info_fops);
349#endif
350}