1 /*-
2 * Copyright (c) 2015 Michal Meloun
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/param.h>
28 #include <sys/systm.h>
29 #include <sys/bus.h>
30 #include <sys/kernel.h>
31 #include <sys/malloc.h>
32 #include <sys/pctrie.h>
33 #include <sys/vmem.h>
34
35 #include <machine/bus.h>
36
37 #include <dev/clk/clk.h>
38 #include <dev/drm2/drmP.h>
39 #include <dev/drm2/drm_crtc_helper.h>
40 #include <dev/drm2/drm_fb_helper.h>
41
42 #include <arm/nvidia/drm2/tegra_drm.h>
43
44 #include <vm/vm.h>
45 #include <vm/vm_pageout.h>
46 #include <vm/vm_radix.h>
47
48 static void
tegra_bo_destruct(struct tegra_bo * bo)49 tegra_bo_destruct(struct tegra_bo *bo)
50 {
51 struct pctrie_iter pages;
52 vm_page_t m;
53 size_t size;
54 int i;
55
56 if (bo->cdev_pager == NULL)
57 return;
58
59 size = round_page(bo->gem_obj.size);
60 if (bo->vbase != 0)
61 pmap_qremove(bo->vbase, bo->npages);
62
63 vm_page_iter_init(&pages, bo->cdev_pager);
64 VM_OBJECT_WLOCK(bo->cdev_pager);
65 for (i = 0; i < bo->npages; i++) {
66 m = vm_radix_iter_lookup(&pages, i);
67 vm_page_busy_acquire(m, 0);
68 cdev_mgtdev_pager_free_page(&pages, m);
69 m->flags &= ~PG_FICTITIOUS;
70 vm_page_unwire_noq(m);
71 vm_page_free(m);
72 }
73 VM_OBJECT_WUNLOCK(bo->cdev_pager);
74
75 vm_object_deallocate(bo->cdev_pager);
76 if (bo->vbase != 0)
77 vmem_free(kernel_arena, bo->vbase, size);
78 }
79
80 static void
tegra_bo_free_object(struct drm_gem_object * gem_obj)81 tegra_bo_free_object(struct drm_gem_object *gem_obj)
82 {
83 struct tegra_bo *bo;
84
85 bo = container_of(gem_obj, struct tegra_bo, gem_obj);
86 drm_gem_free_mmap_offset(gem_obj);
87 drm_gem_object_release(gem_obj);
88
89 tegra_bo_destruct(bo);
90
91 free(bo->m, DRM_MEM_DRIVER);
92 free(bo, DRM_MEM_DRIVER);
93 }
94
95 static int
tegra_bo_alloc_contig(size_t npages,u_long alignment,vm_memattr_t memattr,vm_page_t ** ret_page)96 tegra_bo_alloc_contig(size_t npages, u_long alignment, vm_memattr_t memattr,
97 vm_page_t **ret_page)
98 {
99 vm_page_t m;
100 int err, i, tries;
101 vm_paddr_t low, high, boundary;
102
103 low = 0;
104 high = -1UL;
105 boundary = 0;
106 tries = 0;
107 retry:
108 m = vm_page_alloc_noobj_contig(VM_ALLOC_WIRED | VM_ALLOC_ZERO, npages,
109 low, high, alignment, boundary, memattr);
110 if (m == NULL) {
111 if (tries < 3) {
112 err = vm_page_reclaim_contig(0, npages, low, high,
113 alignment, boundary);
114 if (err == ENOMEM)
115 vm_wait(NULL);
116 else if (err != 0)
117 return (ENOMEM);
118 tries++;
119 goto retry;
120 }
121 return (ENOMEM);
122 }
123
124 for (i = 0; i < npages; i++, m++) {
125 m->valid = VM_PAGE_BITS_ALL;
126 (*ret_page)[i] = m;
127 }
128
129 return (0);
130 }
131
132 /* Initialize pager and insert all object pages to it*/
133 static int
tegra_bo_init_pager(struct tegra_bo * bo)134 tegra_bo_init_pager(struct tegra_bo *bo)
135 {
136 vm_page_t m;
137 size_t size;
138 int i;
139
140 size = round_page(bo->gem_obj.size);
141
142 bo->pbase = VM_PAGE_TO_PHYS(bo->m[0]);
143 if (vmem_alloc(kernel_arena, size, M_WAITOK | M_BESTFIT, &bo->vbase))
144 return (ENOMEM);
145
146 VM_OBJECT_WLOCK(bo->cdev_pager);
147 for (i = 0; i < bo->npages; i++) {
148 m = bo->m[i];
149 /*
150 * XXX This is a temporary hack.
151 * We need pager suitable for paging (mmap) managed
152 * real (non-fictitious) pages.
153 * - managed pages are needed for clean module unload.
154 * - aliasing fictitious page to real one is bad,
155 * pmap cannot handle this situation without issues
156 * It expects that
157 * paddr = PHYS_TO_VM_PAGE(VM_PAGE_TO_PHYS(paddr))
158 * for every single page passed to pmap.
159 */
160 m->oflags &= ~VPO_UNMANAGED;
161 m->flags |= PG_FICTITIOUS;
162 if (vm_page_insert(m, bo->cdev_pager, i) != 0)
163 return (EINVAL);
164 }
165 VM_OBJECT_WUNLOCK(bo->cdev_pager);
166
167 pmap_qenter(bo->vbase, bo->m, bo->npages);
168 return (0);
169 }
170
171 /* Allocate memory for frame buffer */
172 static int
tegra_bo_alloc(struct drm_device * drm,struct tegra_bo * bo)173 tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
174 {
175 size_t size;
176 int rv;
177
178 size = bo->gem_obj.size;
179
180 bo->npages = atop(size);
181 bo->m = malloc(sizeof(vm_page_t *) * bo->npages, DRM_MEM_DRIVER,
182 M_WAITOK | M_ZERO);
183
184 rv = tegra_bo_alloc_contig(bo->npages, PAGE_SIZE,
185 VM_MEMATTR_WRITE_COMBINING, &(bo->m));
186 if (rv != 0) {
187 DRM_WARNING("Cannot allocate memory for gem object.\n");
188 return (rv);
189 }
190 rv = tegra_bo_init_pager(bo);
191 if (rv != 0) {
192 DRM_WARNING("Cannot initialize gem object pager.\n");
193 return (rv);
194 }
195 return (0);
196 }
197
198 int
tegra_bo_create(struct drm_device * drm,size_t size,struct tegra_bo ** res_bo)199 tegra_bo_create(struct drm_device *drm, size_t size, struct tegra_bo **res_bo)
200 {
201 struct tegra_bo *bo;
202 int rv;
203
204 if (size <= 0)
205 return (-EINVAL);
206
207 bo = malloc(sizeof(*bo), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
208
209 size = round_page(size);
210 rv = drm_gem_object_init(drm, &bo->gem_obj, size);
211 if (rv != 0) {
212 free(bo, DRM_MEM_DRIVER);
213 return (rv);
214 }
215 rv = drm_gem_create_mmap_offset(&bo->gem_obj);
216 if (rv != 0) {
217 drm_gem_object_release(&bo->gem_obj);
218 free(bo, DRM_MEM_DRIVER);
219 return (rv);
220 }
221
222 bo->cdev_pager = cdev_pager_allocate(&bo->gem_obj, OBJT_MGTDEVICE,
223 drm->driver->gem_pager_ops, size, 0, 0, NULL);
224 rv = tegra_bo_alloc(drm, bo);
225 if (rv != 0) {
226 tegra_bo_free_object(&bo->gem_obj);
227 return (rv);
228 }
229
230 *res_bo = bo;
231 return (0);
232 }
233
234 static int
tegra_bo_create_with_handle(struct drm_file * file,struct drm_device * drm,size_t size,uint32_t * handle,struct tegra_bo ** res_bo)235 tegra_bo_create_with_handle(struct drm_file *file, struct drm_device *drm,
236 size_t size, uint32_t *handle, struct tegra_bo **res_bo)
237 {
238 int rv;
239 struct tegra_bo *bo;
240
241 rv = tegra_bo_create(drm, size, &bo);
242 if (rv != 0)
243 return (rv);
244
245 rv = drm_gem_handle_create(file, &bo->gem_obj, handle);
246 if (rv != 0) {
247 tegra_bo_free_object(&bo->gem_obj);
248 drm_gem_object_release(&bo->gem_obj);
249 return (rv);
250 }
251
252 drm_gem_object_unreference_unlocked(&bo->gem_obj);
253
254 *res_bo = bo;
255 return (0);
256 }
257
258 static int
tegra_bo_dumb_create(struct drm_file * file,struct drm_device * drm_dev,struct drm_mode_create_dumb * args)259 tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm_dev,
260 struct drm_mode_create_dumb *args)
261 {
262 struct tegra_drm *drm;
263 struct tegra_bo *bo;
264 int rv;
265
266 drm = container_of(drm_dev, struct tegra_drm, drm_dev);
267
268 args->pitch= (args->width * args->bpp + 7) / 8;
269 args->pitch = roundup(args->pitch, drm->pitch_align);
270 args->size = args->pitch * args->height;
271 rv = tegra_bo_create_with_handle(file, drm_dev, args->size,
272 &args->handle, &bo);
273
274 return (rv);
275 }
276
277 static int
tegra_bo_dumb_map_offset(struct drm_file * file_priv,struct drm_device * drm_dev,uint32_t handle,uint64_t * offset)278 tegra_bo_dumb_map_offset(struct drm_file *file_priv,
279 struct drm_device *drm_dev, uint32_t handle, uint64_t *offset)
280 {
281 struct drm_gem_object *gem_obj;
282 int rv;
283
284 DRM_LOCK(drm_dev);
285 gem_obj = drm_gem_object_lookup(drm_dev, file_priv, handle);
286 if (gem_obj == NULL) {
287 device_printf(drm_dev->dev, "Object not found\n");
288 DRM_UNLOCK(drm_dev);
289 return (-EINVAL);
290 }
291 rv = drm_gem_create_mmap_offset(gem_obj);
292 if (rv != 0)
293 goto fail;
294
295 *offset = DRM_GEM_MAPPING_OFF(gem_obj->map_list.key) |
296 DRM_GEM_MAPPING_KEY;
297
298 drm_gem_object_unreference(gem_obj);
299 DRM_UNLOCK(drm_dev);
300 return (0);
301
302 fail:
303 drm_gem_object_unreference(gem_obj);
304 DRM_UNLOCK(drm_dev);
305 return (rv);
306 }
307
308 static int
tegra_bo_dumb_destroy(struct drm_file * file_priv,struct drm_device * drm_dev,unsigned int handle)309 tegra_bo_dumb_destroy(struct drm_file *file_priv, struct drm_device *drm_dev,
310 unsigned int handle)
311 {
312 int rv;
313
314 rv = drm_gem_handle_delete(file_priv, handle);
315 return (rv);
316 }
317
318 /*
319 * mmap support
320 */
321 static int
tegra_gem_pager_fault(vm_object_t vm_obj,vm_ooffset_t offset,int prot,vm_page_t * mres)322 tegra_gem_pager_fault(vm_object_t vm_obj, vm_ooffset_t offset, int prot,
323 vm_page_t *mres)
324 {
325
326 #ifdef DRM_PAGER_DEBUG
327 DRM_DEBUG("object %p offset %jd prot %d mres %p\n",
328 vm_obj, (intmax_t)offset, prot, mres);
329 #endif
330 return (VM_PAGER_FAIL);
331
332 }
333
334 static int
tegra_gem_pager_ctor(void * handle,vm_ooffset_t size,vm_prot_t prot,vm_ooffset_t foff,struct ucred * cred,u_short * color)335 tegra_gem_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
336 vm_ooffset_t foff, struct ucred *cred, u_short *color)
337 {
338
339 if (color != NULL)
340 *color = 0;
341 return (0);
342 }
343
344 static void
tegra_gem_pager_dtor(void * handle)345 tegra_gem_pager_dtor(void *handle)
346 {
347
348 }
349
350 static struct cdev_pager_ops tegra_gem_pager_ops = {
351 .cdev_pg_fault = tegra_gem_pager_fault,
352 .cdev_pg_ctor = tegra_gem_pager_ctor,
353 .cdev_pg_dtor = tegra_gem_pager_dtor
354 };
355
356 /* Fill up relevant fields in drm_driver ops */
357 void
tegra_bo_driver_register(struct drm_driver * drm_drv)358 tegra_bo_driver_register(struct drm_driver *drm_drv)
359 {
360 drm_drv->gem_free_object = tegra_bo_free_object;
361 drm_drv->gem_pager_ops = &tegra_gem_pager_ops;
362 drm_drv->dumb_create = tegra_bo_dumb_create;
363 drm_drv->dumb_map_offset = tegra_bo_dumb_map_offset;
364 drm_drv->dumb_destroy = tegra_bo_dumb_destroy;
365 }
366