xref: /linux/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c (revision ab93e0dd72c37d378dd936f031ffb83ff2bd87ce)
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 
vmw_gem_object_free(struct drm_gem_object * gobj)36 static 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_put(bo);
41 }
42 
vmw_gem_object_open(struct drm_gem_object * obj,struct drm_file * file_priv)43 static int vmw_gem_object_open(struct drm_gem_object *obj,
44 			       struct drm_file *file_priv)
45 {
46 	return 0;
47 }
48 
vmw_gem_object_close(struct drm_gem_object * obj,struct drm_file * file_priv)49 static void vmw_gem_object_close(struct drm_gem_object *obj,
50 				 struct drm_file *file_priv)
51 {
52 }
53 
vmw_gem_object_pin(struct drm_gem_object * obj)54 static 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 
vmw_gem_object_unpin(struct drm_gem_object * obj)63 static 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 
vmw_gem_object_get_sg_table(struct drm_gem_object * obj)70 static 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 
vmw_gem_vmap(struct drm_gem_object * obj,struct iosys_map * map)82 static 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 
vmw_gem_vunmap(struct drm_gem_object * obj,struct iosys_map * map)102 static 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 
vmw_gem_mmap(struct drm_gem_object * obj,struct vm_area_struct * vma)110 static 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 
135 static 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 
143 const 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 
vmw_gem_object_create_with_handle(struct vmw_private * dev_priv,struct drm_file * filp,uint32_t size,uint32_t * handle,struct vmw_bo ** p_vbo)157 int 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);
177 out_no_bo:
178 	return ret;
179 }
180 
vmw_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * table)181 struct 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;
210 out_no_bo:
211 	dma_resv_unlock(params.resv);
212 	return gem;
213 }
214 
vmw_gem_object_create_ioctl(struct drm_device * dev,void * data,struct drm_file * filp)215 int 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);
238 out_no_bo:
239 	return ret;
240 }
241 
242 #if defined(CONFIG_DEBUG_FS)
243 
vmw_bo_print_info(int id,struct vmw_bo * bo,struct seq_file * m)244 static 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 
vmw_debugfs_gem_info_show(struct seq_file * m,void * unused)294 static 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 
337 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);
338 
339 #endif
340 
vmw_debugfs_gem_init(struct vmw_private * vdev)341 void 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 }
351