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 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 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 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 134 tegra_bo_init_pager(struct tegra_bo *bo) 135 { 136 struct pctrie_iter pages; 137 vm_page_t m; 138 size_t size; 139 int i; 140 141 size = round_page(bo->gem_obj.size); 142 143 bo->pbase = VM_PAGE_TO_PHYS(bo->m[0]); 144 if (vmem_alloc(kernel_arena, size, M_WAITOK | M_BESTFIT, &bo->vbase)) 145 return (ENOMEM); 146 147 vm_page_iter_init(&pages, bo->cdev_pager); 148 VM_OBJECT_WLOCK(bo->cdev_pager); 149 for (i = 0; i < bo->npages; i++) { 150 m = bo->m[i]; 151 /* 152 * XXX This is a temporary hack. 153 * We need pager suitable for paging (mmap) managed 154 * real (non-fictitious) pages. 155 * - managed pages are needed for clean module unload. 156 * - aliasing fictitious page to real one is bad, 157 * pmap cannot handle this situation without issues 158 * It expects that 159 * paddr = PHYS_TO_VM_PAGE(VM_PAGE_TO_PHYS(paddr)) 160 * for every single page passed to pmap. 161 */ 162 m->oflags &= ~VPO_UNMANAGED; 163 m->flags |= PG_FICTITIOUS; 164 if (vm_page_iter_insert(m, bo->cdev_pager, i, &pages) != 0) 165 return (EINVAL); 166 } 167 VM_OBJECT_WUNLOCK(bo->cdev_pager); 168 169 pmap_qenter(bo->vbase, bo->m, bo->npages); 170 return (0); 171 } 172 173 /* Allocate memory for frame buffer */ 174 static int 175 tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 176 { 177 size_t size; 178 int rv; 179 180 size = bo->gem_obj.size; 181 182 bo->npages = atop(size); 183 bo->m = malloc(sizeof(vm_page_t *) * bo->npages, DRM_MEM_DRIVER, 184 M_WAITOK | M_ZERO); 185 186 rv = tegra_bo_alloc_contig(bo->npages, PAGE_SIZE, 187 VM_MEMATTR_WRITE_COMBINING, &(bo->m)); 188 if (rv != 0) { 189 DRM_WARNING("Cannot allocate memory for gem object.\n"); 190 return (rv); 191 } 192 rv = tegra_bo_init_pager(bo); 193 if (rv != 0) { 194 DRM_WARNING("Cannot initialize gem object pager.\n"); 195 return (rv); 196 } 197 return (0); 198 } 199 200 int 201 tegra_bo_create(struct drm_device *drm, size_t size, struct tegra_bo **res_bo) 202 { 203 struct tegra_bo *bo; 204 int rv; 205 206 if (size <= 0) 207 return (-EINVAL); 208 209 bo = malloc(sizeof(*bo), DRM_MEM_DRIVER, M_WAITOK | M_ZERO); 210 211 size = round_page(size); 212 rv = drm_gem_object_init(drm, &bo->gem_obj, size); 213 if (rv != 0) { 214 free(bo, DRM_MEM_DRIVER); 215 return (rv); 216 } 217 rv = drm_gem_create_mmap_offset(&bo->gem_obj); 218 if (rv != 0) { 219 drm_gem_object_release(&bo->gem_obj); 220 free(bo, DRM_MEM_DRIVER); 221 return (rv); 222 } 223 224 bo->cdev_pager = cdev_pager_allocate(&bo->gem_obj, OBJT_MGTDEVICE, 225 drm->driver->gem_pager_ops, size, 0, 0, NULL); 226 rv = tegra_bo_alloc(drm, bo); 227 if (rv != 0) { 228 tegra_bo_free_object(&bo->gem_obj); 229 return (rv); 230 } 231 232 *res_bo = bo; 233 return (0); 234 } 235 236 static int 237 tegra_bo_create_with_handle(struct drm_file *file, struct drm_device *drm, 238 size_t size, uint32_t *handle, struct tegra_bo **res_bo) 239 { 240 int rv; 241 struct tegra_bo *bo; 242 243 rv = tegra_bo_create(drm, size, &bo); 244 if (rv != 0) 245 return (rv); 246 247 rv = drm_gem_handle_create(file, &bo->gem_obj, handle); 248 if (rv != 0) { 249 tegra_bo_free_object(&bo->gem_obj); 250 drm_gem_object_release(&bo->gem_obj); 251 return (rv); 252 } 253 254 drm_gem_object_unreference_unlocked(&bo->gem_obj); 255 256 *res_bo = bo; 257 return (0); 258 } 259 260 static int 261 tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm_dev, 262 struct drm_mode_create_dumb *args) 263 { 264 struct tegra_drm *drm; 265 struct tegra_bo *bo; 266 int rv; 267 268 drm = container_of(drm_dev, struct tegra_drm, drm_dev); 269 270 args->pitch= (args->width * args->bpp + 7) / 8; 271 args->pitch = roundup(args->pitch, drm->pitch_align); 272 args->size = args->pitch * args->height; 273 rv = tegra_bo_create_with_handle(file, drm_dev, args->size, 274 &args->handle, &bo); 275 276 return (rv); 277 } 278 279 static int 280 tegra_bo_dumb_map_offset(struct drm_file *file_priv, 281 struct drm_device *drm_dev, uint32_t handle, uint64_t *offset) 282 { 283 struct drm_gem_object *gem_obj; 284 int rv; 285 286 DRM_LOCK(drm_dev); 287 gem_obj = drm_gem_object_lookup(drm_dev, file_priv, handle); 288 if (gem_obj == NULL) { 289 device_printf(drm_dev->dev, "Object not found\n"); 290 DRM_UNLOCK(drm_dev); 291 return (-EINVAL); 292 } 293 rv = drm_gem_create_mmap_offset(gem_obj); 294 if (rv != 0) 295 goto fail; 296 297 *offset = DRM_GEM_MAPPING_OFF(gem_obj->map_list.key) | 298 DRM_GEM_MAPPING_KEY; 299 300 drm_gem_object_unreference(gem_obj); 301 DRM_UNLOCK(drm_dev); 302 return (0); 303 304 fail: 305 drm_gem_object_unreference(gem_obj); 306 DRM_UNLOCK(drm_dev); 307 return (rv); 308 } 309 310 static int 311 tegra_bo_dumb_destroy(struct drm_file *file_priv, struct drm_device *drm_dev, 312 unsigned int handle) 313 { 314 int rv; 315 316 rv = drm_gem_handle_delete(file_priv, handle); 317 return (rv); 318 } 319 320 /* 321 * mmap support 322 */ 323 static int 324 tegra_gem_pager_fault(vm_object_t vm_obj, vm_ooffset_t offset, int prot, 325 vm_page_t *mres) 326 { 327 328 #ifdef DRM_PAGER_DEBUG 329 DRM_DEBUG("object %p offset %jd prot %d mres %p\n", 330 vm_obj, (intmax_t)offset, prot, mres); 331 #endif 332 return (VM_PAGER_FAIL); 333 334 } 335 336 static int 337 tegra_gem_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 338 vm_ooffset_t foff, struct ucred *cred, u_short *color) 339 { 340 341 if (color != NULL) 342 *color = 0; 343 return (0); 344 } 345 346 static void 347 tegra_gem_pager_dtor(void *handle) 348 { 349 350 } 351 352 static struct cdev_pager_ops tegra_gem_pager_ops = { 353 .cdev_pg_fault = tegra_gem_pager_fault, 354 .cdev_pg_ctor = tegra_gem_pager_ctor, 355 .cdev_pg_dtor = tegra_gem_pager_dtor 356 }; 357 358 /* Fill up relevant fields in drm_driver ops */ 359 void 360 tegra_bo_driver_register(struct drm_driver *drm_drv) 361 { 362 drm_drv->gem_free_object = tegra_bo_free_object; 363 drm_drv->gem_pager_ops = &tegra_gem_pager_ops; 364 drm_drv->dumb_create = tegra_bo_dumb_create; 365 drm_drv->dumb_map_offset = tegra_bo_dumb_map_offset; 366 drm_drv->dumb_destroy = tegra_bo_dumb_destroy; 367 } 368