3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
28 #include <linux/shmem_fs.h>
29 #include <drm/exynos_drm.h>
31 #include "exynos_drm_drv.h"
32 #include "exynos_drm_gem.h"
33 #include "exynos_drm_buf.h"
35 static unsigned int convert_to_vm_err_msg(int msg)
43 out_msg = VM_FAULT_NOPAGE;
47 out_msg = VM_FAULT_OOM;
51 out_msg = VM_FAULT_SIGBUS;
58 static int check_gem_flags(unsigned int flags)
60 if (flags & ~(EXYNOS_BO_MASK)) {
61 DRM_ERROR("invalid flags.\n");
68 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
69 struct vm_area_struct *vma)
71 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
73 /* non-cachable as default. */
74 if (obj->flags & EXYNOS_BO_CACHABLE)
75 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
76 else if (obj->flags & EXYNOS_BO_WC)
78 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
81 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
84 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
88 return roundup(size, PAGE_SIZE);
91 static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
92 struct vm_area_struct *vma,
93 unsigned long f_vaddr,
96 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
97 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
100 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
104 pfn = page_to_pfn(buf->pages[page_offset++]);
106 pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
108 return vm_insert_mixed(vma, f_vaddr, pfn);
111 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
112 struct drm_file *file_priv,
113 unsigned int *handle)
118 * allocate a id of idr table where the obj is registered
119 * and handle has the id what user can see.
121 ret = drm_gem_handle_create(file_priv, obj, handle);
125 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
127 /* drop reference from allocate - handle holds it now. */
128 drm_gem_object_unreference_unlocked(obj);
133 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
135 struct drm_gem_object *obj;
136 struct exynos_drm_gem_buf *buf;
138 DRM_DEBUG_KMS("%s\n", __FILE__);
140 obj = &exynos_gem_obj->base;
141 buf = exynos_gem_obj->buffer;
143 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
146 * do not release memory region from exporter.
148 * the region will be released by exporter
149 * once dmabuf's refcount becomes 0.
151 if (obj->import_attach)
154 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
157 exynos_drm_fini_buf(obj->dev, buf);
158 exynos_gem_obj->buffer = NULL;
160 if (obj->map_list.map)
161 drm_gem_free_mmap_offset(obj);
163 /* release file pointer to gem object. */
164 drm_gem_object_release(obj);
166 kfree(exynos_gem_obj);
167 exynos_gem_obj = NULL;
170 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
173 struct exynos_drm_gem_obj *exynos_gem_obj;
174 struct drm_gem_object *obj;
177 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
178 if (!exynos_gem_obj) {
179 DRM_ERROR("failed to allocate exynos gem object\n");
183 exynos_gem_obj->size = size;
184 obj = &exynos_gem_obj->base;
186 ret = drm_gem_object_init(dev, obj, size);
188 DRM_ERROR("failed to initialize gem object\n");
189 kfree(exynos_gem_obj);
193 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
195 return exynos_gem_obj;
198 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
202 struct exynos_drm_gem_obj *exynos_gem_obj;
203 struct exynos_drm_gem_buf *buf;
207 DRM_ERROR("invalid size.\n");
208 return ERR_PTR(-EINVAL);
211 size = roundup_gem_size(size, flags);
212 DRM_DEBUG_KMS("%s\n", __FILE__);
214 ret = check_gem_flags(flags);
218 buf = exynos_drm_init_buf(dev, size);
220 return ERR_PTR(-ENOMEM);
222 exynos_gem_obj = exynos_drm_gem_init(dev, size);
223 if (!exynos_gem_obj) {
228 exynos_gem_obj->buffer = buf;
230 /* set memory type and cache attribute from user side. */
231 exynos_gem_obj->flags = flags;
233 ret = exynos_drm_alloc_buf(dev, buf, flags);
235 drm_gem_object_release(&exynos_gem_obj->base);
239 return exynos_gem_obj;
242 exynos_drm_fini_buf(dev, buf);
246 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
247 struct drm_file *file_priv)
249 struct drm_exynos_gem_create *args = data;
250 struct exynos_drm_gem_obj *exynos_gem_obj;
253 DRM_DEBUG_KMS("%s\n", __FILE__);
255 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
256 if (IS_ERR(exynos_gem_obj))
257 return PTR_ERR(exynos_gem_obj);
259 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
262 exynos_drm_gem_destroy(exynos_gem_obj);
269 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
270 unsigned int gem_handle,
271 struct drm_file *filp)
273 struct exynos_drm_gem_obj *exynos_gem_obj;
274 struct drm_gem_object *obj;
276 obj = drm_gem_object_lookup(dev, filp, gem_handle);
278 DRM_ERROR("failed to lookup gem object.\n");
279 return ERR_PTR(-EINVAL);
282 exynos_gem_obj = to_exynos_gem_obj(obj);
284 return &exynos_gem_obj->buffer->dma_addr;
287 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
288 unsigned int gem_handle,
289 struct drm_file *filp)
291 struct exynos_drm_gem_obj *exynos_gem_obj;
292 struct drm_gem_object *obj;
294 obj = drm_gem_object_lookup(dev, filp, gem_handle);
296 DRM_ERROR("failed to lookup gem object.\n");
300 exynos_gem_obj = to_exynos_gem_obj(obj);
302 drm_gem_object_unreference_unlocked(obj);
305 * decrease obj->refcount one more time because we has already
306 * increased it at exynos_drm_gem_get_dma_addr().
308 drm_gem_object_unreference_unlocked(obj);
311 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
312 struct drm_file *file_priv)
314 struct drm_exynos_gem_map_off *args = data;
316 DRM_DEBUG_KMS("%s\n", __FILE__);
318 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
319 args->handle, (unsigned long)args->offset);
321 if (!(dev->driver->driver_features & DRIVER_GEM)) {
322 DRM_ERROR("does not support GEM.\n");
326 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
330 static int exynos_drm_gem_mmap_buffer(struct file *filp,
331 struct vm_area_struct *vma)
333 struct drm_gem_object *obj = filp->private_data;
334 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
335 struct exynos_drm_gem_buf *buffer;
336 unsigned long vm_size;
338 DRM_DEBUG_KMS("%s\n", __FILE__);
340 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
342 update_vm_cache_attr(exynos_gem_obj, vma);
344 vm_size = vma->vm_end - vma->vm_start;
347 * a buffer contains information to physically continuous memory
348 * allocated by user request or at framebuffer creation.
350 buffer = exynos_gem_obj->buffer;
352 /* check if user-requested size is valid. */
353 if (vm_size > buffer->size)
356 return dma_mmap_attrs(obj->dev->dev, vma, buffer->kvaddr,
357 buffer->dma_addr, buffer->size,
361 static const struct file_operations exynos_drm_gem_fops = {
362 .mmap = exynos_drm_gem_mmap_buffer,
365 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
366 struct drm_file *file_priv)
368 struct drm_exynos_gem_mmap *args = data;
369 struct drm_gem_object *obj;
372 DRM_DEBUG_KMS("%s\n", __FILE__);
374 if (!(dev->driver->driver_features & DRIVER_GEM)) {
375 DRM_ERROR("does not support GEM.\n");
379 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
381 DRM_ERROR("failed to lookup gem object.\n");
385 obj->filp->f_op = &exynos_drm_gem_fops;
386 obj->filp->private_data = obj;
388 addr = vm_mmap(obj->filp, 0, args->size,
389 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
391 drm_gem_object_unreference_unlocked(obj);
393 if (IS_ERR((void *)addr))
394 return PTR_ERR((void *)addr);
398 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
403 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
404 struct drm_file *file_priv)
405 { struct exynos_drm_gem_obj *exynos_gem_obj;
406 struct drm_exynos_gem_info *args = data;
407 struct drm_gem_object *obj;
409 mutex_lock(&dev->struct_mutex);
411 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
413 DRM_ERROR("failed to lookup gem object.\n");
414 mutex_unlock(&dev->struct_mutex);
418 exynos_gem_obj = to_exynos_gem_obj(obj);
420 args->flags = exynos_gem_obj->flags;
421 args->size = exynos_gem_obj->size;
423 drm_gem_object_unreference(obj);
424 mutex_unlock(&dev->struct_mutex);
429 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
431 DRM_DEBUG_KMS("%s\n", __FILE__);
436 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
438 struct exynos_drm_gem_obj *exynos_gem_obj;
439 struct exynos_drm_gem_buf *buf;
441 DRM_DEBUG_KMS("%s\n", __FILE__);
443 exynos_gem_obj = to_exynos_gem_obj(obj);
444 buf = exynos_gem_obj->buffer;
446 if (obj->import_attach)
447 drm_prime_gem_destroy(obj, buf->sgt);
449 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
452 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
453 struct drm_device *dev,
454 struct drm_mode_create_dumb *args)
456 struct exynos_drm_gem_obj *exynos_gem_obj;
459 DRM_DEBUG_KMS("%s\n", __FILE__);
462 * alocate memory to be used for framebuffer.
463 * - this callback would be called by user application
464 * with DRM_IOCTL_MODE_CREATE_DUMB command.
467 args->pitch = args->width * ((args->bpp + 7) / 8);
468 args->size = args->pitch * args->height;
470 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
471 if (IS_ERR(exynos_gem_obj))
472 return PTR_ERR(exynos_gem_obj);
474 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
477 exynos_drm_gem_destroy(exynos_gem_obj);
484 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
485 struct drm_device *dev, uint32_t handle,
488 struct drm_gem_object *obj;
491 DRM_DEBUG_KMS("%s\n", __FILE__);
493 mutex_lock(&dev->struct_mutex);
496 * get offset of memory allocated for drm framebuffer.
497 * - this callback would be called by user application
498 * with DRM_IOCTL_MODE_MAP_DUMB command.
501 obj = drm_gem_object_lookup(dev, file_priv, handle);
503 DRM_ERROR("failed to lookup gem object.\n");
508 if (!obj->map_list.map) {
509 ret = drm_gem_create_mmap_offset(obj);
514 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
515 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
518 drm_gem_object_unreference(obj);
520 mutex_unlock(&dev->struct_mutex);
524 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
525 struct drm_device *dev,
530 DRM_DEBUG_KMS("%s\n", __FILE__);
533 * obj->refcount and obj->handle_count are decreased and
534 * if both them are 0 then exynos_drm_gem_free_object()
535 * would be called by callback to release resources.
537 ret = drm_gem_handle_delete(file_priv, handle);
539 DRM_ERROR("failed to delete drm_gem_handle.\n");
546 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
548 struct drm_gem_object *obj = vma->vm_private_data;
549 struct drm_device *dev = obj->dev;
550 unsigned long f_vaddr;
554 page_offset = ((unsigned long)vmf->virtual_address -
555 vma->vm_start) >> PAGE_SHIFT;
556 f_vaddr = (unsigned long)vmf->virtual_address;
558 mutex_lock(&dev->struct_mutex);
560 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
562 DRM_ERROR("failed to map a buffer with user.\n");
564 mutex_unlock(&dev->struct_mutex);
566 return convert_to_vm_err_msg(ret);
569 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
571 struct exynos_drm_gem_obj *exynos_gem_obj;
572 struct drm_gem_object *obj;
575 DRM_DEBUG_KMS("%s\n", __FILE__);
577 /* set vm_area_struct. */
578 ret = drm_gem_mmap(filp, vma);
580 DRM_ERROR("failed to mmap.\n");
584 obj = vma->vm_private_data;
585 exynos_gem_obj = to_exynos_gem_obj(obj);
587 ret = check_gem_flags(exynos_gem_obj->flags);
589 drm_gem_vm_close(vma);
590 drm_gem_free_mmap_offset(obj);
594 vma->vm_flags &= ~VM_PFNMAP;
595 vma->vm_flags |= VM_MIXEDMAP;
597 update_vm_cache_attr(exynos_gem_obj, vma);