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.
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 exynos_drm_gem_handle_create(struct drm_gem_object *obj,
59 struct drm_file *file_priv,
65 * allocate a id of idr table where the obj is registered
66 * and handle has the id what user can see.
68 ret = drm_gem_handle_create(file_priv, obj, handle);
72 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
74 /* drop reference from allocate - handle holds it now. */
75 drm_gem_object_unreference_unlocked(obj);
80 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
82 struct drm_gem_object *obj;
84 DRM_DEBUG_KMS("%s\n", __FILE__);
89 obj = &exynos_gem_obj->base;
91 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
93 exynos_drm_buf_destroy(obj->dev, exynos_gem_obj->buffer);
95 if (obj->map_list.map)
96 drm_gem_free_mmap_offset(obj);
98 /* release file pointer to gem object. */
99 drm_gem_object_release(obj);
101 kfree(exynos_gem_obj);
104 static struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
107 struct exynos_drm_gem_obj *exynos_gem_obj;
108 struct drm_gem_object *obj;
111 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
112 if (!exynos_gem_obj) {
113 DRM_ERROR("failed to allocate exynos gem object\n");
117 obj = &exynos_gem_obj->base;
119 ret = drm_gem_object_init(dev, obj, size);
121 DRM_ERROR("failed to initialize gem object\n");
122 kfree(exynos_gem_obj);
126 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
128 return exynos_gem_obj;
131 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
134 struct exynos_drm_gem_buf *buffer;
135 struct exynos_drm_gem_obj *exynos_gem_obj;
137 size = roundup(size, PAGE_SIZE);
138 DRM_DEBUG_KMS("%s: size = 0x%lx\n", __FILE__, size);
140 buffer = exynos_drm_buf_create(dev, size);
142 return ERR_PTR(-ENOMEM);
144 exynos_gem_obj = exynos_drm_gem_init(dev, size);
145 if (!exynos_gem_obj) {
146 exynos_drm_buf_destroy(dev, buffer);
147 return ERR_PTR(-ENOMEM);
150 exynos_gem_obj->buffer = buffer;
152 return exynos_gem_obj;
155 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
156 struct drm_file *file_priv)
158 struct drm_exynos_gem_create *args = data;
159 struct exynos_drm_gem_obj *exynos_gem_obj;
162 DRM_DEBUG_KMS("%s\n", __FILE__);
164 exynos_gem_obj = exynos_drm_gem_create(dev, args->size);
165 if (IS_ERR(exynos_gem_obj))
166 return PTR_ERR(exynos_gem_obj);
168 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
171 exynos_drm_gem_destroy(exynos_gem_obj);
178 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
179 struct drm_file *file_priv)
181 struct drm_exynos_gem_map_off *args = data;
183 DRM_DEBUG_KMS("%s\n", __FILE__);
185 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
186 args->handle, (unsigned long)args->offset);
188 if (!(dev->driver->driver_features & DRIVER_GEM)) {
189 DRM_ERROR("does not support GEM.\n");
193 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
197 static int exynos_drm_gem_mmap_buffer(struct file *filp,
198 struct vm_area_struct *vma)
200 struct drm_gem_object *obj = filp->private_data;
201 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
202 struct exynos_drm_gem_buf *buffer;
203 unsigned long pfn, vm_size;
205 DRM_DEBUG_KMS("%s\n", __FILE__);
207 vma->vm_flags |= (VM_IO | VM_RESERVED);
209 /* in case of direct mapping, always having non-cachable attribute */
210 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
212 vm_size = vma->vm_end - vma->vm_start;
214 * a buffer contains information to physically continuous memory
215 * allocated by user request or at framebuffer creation.
217 buffer = exynos_gem_obj->buffer;
219 /* check if user-requested size is valid. */
220 if (vm_size > buffer->size)
224 * get page frame number to physical memory to be mapped
227 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >> PAGE_SHIFT;
229 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
231 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
232 vma->vm_page_prot)) {
233 DRM_ERROR("failed to remap pfn range.\n");
240 static const struct file_operations exynos_drm_gem_fops = {
241 .mmap = exynos_drm_gem_mmap_buffer,
244 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
245 struct drm_file *file_priv)
247 struct drm_exynos_gem_mmap *args = data;
248 struct drm_gem_object *obj;
251 DRM_DEBUG_KMS("%s\n", __FILE__);
253 if (!(dev->driver->driver_features & DRIVER_GEM)) {
254 DRM_ERROR("does not support GEM.\n");
258 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
260 DRM_ERROR("failed to lookup gem object.\n");
264 obj->filp->f_op = &exynos_drm_gem_fops;
265 obj->filp->private_data = obj;
267 down_write(¤t->mm->mmap_sem);
268 addr = do_mmap(obj->filp, 0, args->size,
269 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
270 up_write(¤t->mm->mmap_sem);
272 drm_gem_object_unreference_unlocked(obj);
274 if (IS_ERR((void *)addr))
275 return PTR_ERR((void *)addr);
279 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
284 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
286 DRM_DEBUG_KMS("%s\n", __FILE__);
291 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
293 DRM_DEBUG_KMS("%s\n", __FILE__);
295 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
298 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
299 struct drm_device *dev,
300 struct drm_mode_create_dumb *args)
302 struct exynos_drm_gem_obj *exynos_gem_obj;
305 DRM_DEBUG_KMS("%s\n", __FILE__);
308 * alocate memory to be used for framebuffer.
309 * - this callback would be called by user application
310 * with DRM_IOCTL_MODE_CREATE_DUMB command.
313 args->pitch = args->width * args->bpp >> 3;
314 args->size = args->pitch * args->height;
316 exynos_gem_obj = exynos_drm_gem_create(dev, args->size);
317 if (IS_ERR(exynos_gem_obj))
318 return PTR_ERR(exynos_gem_obj);
320 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
323 exynos_drm_gem_destroy(exynos_gem_obj);
330 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
331 struct drm_device *dev, uint32_t handle,
334 struct exynos_drm_gem_obj *exynos_gem_obj;
335 struct drm_gem_object *obj;
338 DRM_DEBUG_KMS("%s\n", __FILE__);
340 mutex_lock(&dev->struct_mutex);
343 * get offset of memory allocated for drm framebuffer.
344 * - this callback would be called by user application
345 * with DRM_IOCTL_MODE_MAP_DUMB command.
348 obj = drm_gem_object_lookup(dev, file_priv, handle);
350 DRM_ERROR("failed to lookup gem object.\n");
355 exynos_gem_obj = to_exynos_gem_obj(obj);
357 if (!exynos_gem_obj->base.map_list.map) {
358 ret = drm_gem_create_mmap_offset(&exynos_gem_obj->base);
363 *offset = (u64)exynos_gem_obj->base.map_list.hash.key << PAGE_SHIFT;
364 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
367 drm_gem_object_unreference(obj);
369 mutex_unlock(&dev->struct_mutex);
373 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
374 struct drm_device *dev,
379 DRM_DEBUG_KMS("%s\n", __FILE__);
382 * obj->refcount and obj->handle_count are decreased and
383 * if both them are 0 then exynos_drm_gem_free_object()
384 * would be called by callback to release resources.
386 ret = drm_gem_handle_delete(file_priv, handle);
388 DRM_ERROR("failed to delete drm_gem_handle.\n");
395 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
397 struct drm_gem_object *obj = vma->vm_private_data;
398 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
399 struct drm_device *dev = obj->dev;
404 page_offset = ((unsigned long)vmf->virtual_address -
405 vma->vm_start) >> PAGE_SHIFT;
407 mutex_lock(&dev->struct_mutex);
409 pfn = (((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
410 PAGE_SHIFT) + page_offset;
412 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
414 mutex_unlock(&dev->struct_mutex);
416 return convert_to_vm_err_msg(ret);
419 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
423 DRM_DEBUG_KMS("%s\n", __FILE__);
425 /* set vm_area_struct. */
426 ret = drm_gem_mmap(filp, vma);
428 DRM_ERROR("failed to mmap.\n");
432 vma->vm_flags &= ~VM_PFNMAP;
433 vma->vm_flags |= VM_MIXEDMAP;
438 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
439 MODULE_DESCRIPTION("Samsung SoC DRM GEM Module");
440 MODULE_LICENSE("GPL");