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 unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
60 DRM_DEBUG_KMS("%s\n", __FILE__);
62 return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
65 static struct exynos_drm_gem_obj
66 *exynos_drm_gem_init(struct drm_device *drm_dev,
67 struct drm_file *file_priv, unsigned int *handle,
70 struct exynos_drm_gem_obj *exynos_gem_obj;
71 struct drm_gem_object *obj;
74 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
75 if (!exynos_gem_obj) {
76 DRM_ERROR("failed to allocate exynos gem object.\n");
77 return ERR_PTR(-ENOMEM);
80 obj = &exynos_gem_obj->base;
82 ret = drm_gem_object_init(drm_dev, obj, size);
84 DRM_ERROR("failed to initialize gem object.\n");
89 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
91 ret = drm_gem_create_mmap_offset(obj);
93 DRM_ERROR("failed to allocate mmap offset.\n");
94 goto err_create_mmap_offset;
98 * allocate a id of idr table where the obj is registered
99 * and handle has the id what user can see.
101 ret = drm_gem_handle_create(file_priv, obj, handle);
103 goto err_handle_create;
105 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
107 /* drop reference from allocate - handle holds it now. */
108 drm_gem_object_unreference_unlocked(obj);
110 return exynos_gem_obj;
113 drm_gem_free_mmap_offset(obj);
115 err_create_mmap_offset:
116 drm_gem_object_release(obj);
119 kfree(exynos_gem_obj);
124 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
125 struct drm_file *file_priv,
126 unsigned int *handle, unsigned long size)
129 struct exynos_drm_gem_obj *exynos_gem_obj = NULL;
130 struct exynos_drm_gem_buf *buffer;
132 size = roundup(size, PAGE_SIZE);
134 DRM_DEBUG_KMS("%s: size = 0x%lx\n", __FILE__, size);
136 buffer = exynos_drm_buf_create(dev, size);
137 if (IS_ERR(buffer)) {
138 return ERR_CAST(buffer);
141 exynos_gem_obj = exynos_drm_gem_init(dev, file_priv, handle, size);
142 if (IS_ERR(exynos_gem_obj)) {
143 exynos_drm_buf_destroy(dev, buffer);
144 return exynos_gem_obj;
147 exynos_gem_obj->buffer = buffer;
149 return exynos_gem_obj;
152 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
153 struct drm_file *file_priv)
155 struct drm_exynos_gem_create *args = data;
156 struct exynos_drm_gem_obj *exynos_gem_obj = NULL;
158 DRM_DEBUG_KMS("%s\n", __FILE__);
160 exynos_gem_obj = exynos_drm_gem_create(dev, file_priv,
161 &args->handle, args->size);
162 if (IS_ERR(exynos_gem_obj))
163 return PTR_ERR(exynos_gem_obj);
168 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
169 struct drm_file *file_priv)
171 struct drm_exynos_gem_map_off *args = data;
173 DRM_DEBUG_KMS("%s\n", __FILE__);
175 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
176 args->handle, (unsigned long)args->offset);
178 if (!(dev->driver->driver_features & DRIVER_GEM)) {
179 DRM_ERROR("does not support GEM.\n");
183 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
187 static int exynos_drm_gem_mmap_buffer(struct file *filp,
188 struct vm_area_struct *vma)
190 struct drm_gem_object *obj = filp->private_data;
191 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
192 struct exynos_drm_gem_buf *buffer;
193 unsigned long pfn, vm_size;
195 DRM_DEBUG_KMS("%s\n", __FILE__);
197 vma->vm_flags |= (VM_IO | VM_RESERVED);
199 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
202 vm_size = vma->vm_end - vma->vm_start;
204 * a buffer contains information to physically continuous memory
205 * allocated by user request or at framebuffer creation.
207 buffer = exynos_gem_obj->buffer;
209 /* check if user-requested size is valid. */
210 if (vm_size > buffer->size)
214 * get page frame number to physical memory to be mapped
217 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >> PAGE_SHIFT;
219 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
221 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
222 vma->vm_page_prot)) {
223 DRM_ERROR("failed to remap pfn range.\n");
230 static const struct file_operations exynos_drm_gem_fops = {
231 .mmap = exynos_drm_gem_mmap_buffer,
234 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
235 struct drm_file *file_priv)
237 struct drm_exynos_gem_mmap *args = data;
238 struct drm_gem_object *obj;
241 DRM_DEBUG_KMS("%s\n", __FILE__);
243 if (!(dev->driver->driver_features & DRIVER_GEM)) {
244 DRM_ERROR("does not support GEM.\n");
248 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
250 DRM_ERROR("failed to lookup gem object.\n");
254 obj->filp->f_op = &exynos_drm_gem_fops;
255 obj->filp->private_data = obj;
257 down_write(¤t->mm->mmap_sem);
258 addr = do_mmap(obj->filp, 0, args->size,
259 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
260 up_write(¤t->mm->mmap_sem);
262 drm_gem_object_unreference_unlocked(obj);
264 if (IS_ERR((void *)addr))
265 return PTR_ERR((void *)addr);
269 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
274 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
276 DRM_DEBUG_KMS("%s\n", __FILE__);
281 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj)
283 struct exynos_drm_gem_obj *exynos_gem_obj;
285 DRM_DEBUG_KMS("%s\n", __FILE__);
287 DRM_DEBUG_KMS("handle count = %d\n",
288 atomic_read(&gem_obj->handle_count));
290 if (gem_obj->map_list.map)
291 drm_gem_free_mmap_offset(gem_obj);
293 /* release file pointer to gem object. */
294 drm_gem_object_release(gem_obj);
296 exynos_gem_obj = to_exynos_gem_obj(gem_obj);
298 exynos_drm_buf_destroy(gem_obj->dev, exynos_gem_obj->buffer);
300 kfree(exynos_gem_obj);
303 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
304 struct drm_device *dev, struct drm_mode_create_dumb *args)
306 struct exynos_drm_gem_obj *exynos_gem_obj;
308 DRM_DEBUG_KMS("%s\n", __FILE__);
311 * alocate memory to be used for framebuffer.
312 * - this callback would be called by user application
313 * with DRM_IOCTL_MODE_CREATE_DUMB command.
316 args->pitch = args->width * args->bpp >> 3;
317 args->size = args->pitch * args->height;
319 exynos_gem_obj = exynos_drm_gem_create(dev, file_priv, &args->handle,
321 if (IS_ERR(exynos_gem_obj))
322 return PTR_ERR(exynos_gem_obj);
327 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
328 struct drm_device *dev, uint32_t handle, uint64_t *offset)
330 struct exynos_drm_gem_obj *exynos_gem_obj;
331 struct drm_gem_object *obj;
333 DRM_DEBUG_KMS("%s\n", __FILE__);
335 mutex_lock(&dev->struct_mutex);
338 * get offset of memory allocated for drm framebuffer.
339 * - this callback would be called by user application
340 * with DRM_IOCTL_MODE_MAP_DUMB command.
343 obj = drm_gem_object_lookup(dev, file_priv, handle);
345 DRM_ERROR("failed to lookup gem object.\n");
346 mutex_unlock(&dev->struct_mutex);
350 exynos_gem_obj = to_exynos_gem_obj(obj);
352 *offset = get_gem_mmap_offset(&exynos_gem_obj->base);
354 drm_gem_object_unreference(obj);
356 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
358 mutex_unlock(&dev->struct_mutex);
363 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
365 struct drm_gem_object *obj = vma->vm_private_data;
366 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
367 struct drm_device *dev = obj->dev;
372 page_offset = ((unsigned long)vmf->virtual_address -
373 vma->vm_start) >> PAGE_SHIFT;
375 mutex_lock(&dev->struct_mutex);
377 pfn = (((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
378 PAGE_SHIFT) + page_offset;
380 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
382 mutex_unlock(&dev->struct_mutex);
384 return convert_to_vm_err_msg(ret);
387 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
391 DRM_DEBUG_KMS("%s\n", __FILE__);
393 /* set vm_area_struct. */
394 ret = drm_gem_mmap(filp, vma);
396 DRM_ERROR("failed to mmap.\n");
400 vma->vm_flags &= ~VM_PFNMAP;
401 vma->vm_flags |= VM_MIXEDMAP;
407 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
408 struct drm_device *dev, unsigned int handle)
412 DRM_DEBUG_KMS("%s\n", __FILE__);
415 * obj->refcount and obj->handle_count are decreased and
416 * if both them are 0 then exynos_drm_gem_free_object()
417 * would be called by callback to release resources.
419 ret = drm_gem_handle_delete(file_priv, handle);
421 DRM_ERROR("failed to delete drm_gem_handle.\n");
428 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
429 MODULE_DESCRIPTION("Samsung SoC DRM GEM Module");
430 MODULE_LICENSE("GPL");