3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
13 #include <drm/drm_vma_manager.h>
15 #include <linux/shmem_fs.h>
16 #include <drm/exynos_drm.h>
18 #include "exynos_drm_drv.h"
19 #include "exynos_drm_gem.h"
20 #include "exynos_drm_buf.h"
21 #include "exynos_drm_iommu.h"
23 static int exynos_drm_gem_handle_create(struct drm_gem_object
*obj
,
24 struct drm_file
*file_priv
,
30 * allocate a id of idr table where the obj is registered
31 * and handle has the id what user can see.
33 ret
= drm_gem_handle_create(file_priv
, obj
, handle
);
37 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle
);
39 /* drop reference from allocate - handle holds it now. */
40 drm_gem_object_unreference_unlocked(obj
);
45 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj
*exynos_gem_obj
)
47 struct drm_gem_object
*obj
;
48 struct exynos_drm_gem_buf
*buf
;
50 obj
= &exynos_gem_obj
->base
;
51 buf
= exynos_gem_obj
->buffer
;
53 DRM_DEBUG_KMS("handle count = %d\n", obj
->handle_count
);
56 * do not release memory region from exporter.
58 * the region will be released by exporter
59 * once dmabuf's refcount becomes 0.
61 if (obj
->import_attach
)
64 exynos_drm_free_buf(obj
->dev
, exynos_gem_obj
->flags
, buf
);
67 exynos_drm_fini_buf(obj
->dev
, buf
);
68 exynos_gem_obj
->buffer
= NULL
;
70 drm_gem_free_mmap_offset(obj
);
72 /* release file pointer to gem object. */
73 drm_gem_object_release(obj
);
75 kfree(exynos_gem_obj
);
76 exynos_gem_obj
= NULL
;
79 unsigned long exynos_drm_gem_get_size(struct drm_device
*dev
,
80 unsigned int gem_handle
,
81 struct drm_file
*file_priv
)
83 struct exynos_drm_gem_obj
*exynos_gem_obj
;
84 struct drm_gem_object
*obj
;
86 obj
= drm_gem_object_lookup(dev
, file_priv
, gem_handle
);
88 DRM_ERROR("failed to lookup gem object.\n");
92 exynos_gem_obj
= to_exynos_gem_obj(obj
);
94 drm_gem_object_unreference_unlocked(obj
);
96 return exynos_gem_obj
->buffer
->size
;
100 struct exynos_drm_gem_obj
*exynos_drm_gem_init(struct drm_device
*dev
,
103 struct exynos_drm_gem_obj
*exynos_gem_obj
;
104 struct drm_gem_object
*obj
;
107 exynos_gem_obj
= kzalloc(sizeof(*exynos_gem_obj
), GFP_KERNEL
);
109 return ERR_PTR(-ENOMEM
);
111 exynos_gem_obj
->size
= size
;
112 obj
= &exynos_gem_obj
->base
;
114 ret
= drm_gem_object_init(dev
, obj
, size
);
116 DRM_ERROR("failed to initialize gem object\n");
117 kfree(exynos_gem_obj
);
121 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj
->filp
);
123 return exynos_gem_obj
;
126 struct exynos_drm_gem_obj
*exynos_drm_gem_create(struct drm_device
*dev
,
130 struct exynos_drm_gem_obj
*exynos_gem_obj
;
131 struct exynos_drm_gem_buf
*buf
;
134 if (flags
& ~(EXYNOS_BO_MASK
)) {
135 DRM_ERROR("invalid flags.\n");
136 return ERR_PTR(-EINVAL
);
140 DRM_ERROR("invalid size.\n");
141 return ERR_PTR(-EINVAL
);
144 size
= roundup(size
, PAGE_SIZE
);
146 buf
= exynos_drm_init_buf(dev
, size
);
148 return ERR_PTR(-ENOMEM
);
150 exynos_gem_obj
= exynos_drm_gem_init(dev
, size
);
151 if (IS_ERR(exynos_gem_obj
)) {
152 ret
= PTR_ERR(exynos_gem_obj
);
156 exynos_gem_obj
->buffer
= buf
;
158 /* set memory type and cache attribute from user side. */
159 exynos_gem_obj
->flags
= flags
;
161 ret
= exynos_drm_alloc_buf(dev
, buf
, flags
);
165 return exynos_gem_obj
;
168 drm_gem_object_release(&exynos_gem_obj
->base
);
169 kfree(exynos_gem_obj
);
171 exynos_drm_fini_buf(dev
, buf
);
175 int exynos_drm_gem_create_ioctl(struct drm_device
*dev
, void *data
,
176 struct drm_file
*file_priv
)
178 struct drm_exynos_gem_create
*args
= data
;
179 struct exynos_drm_gem_obj
*exynos_gem_obj
;
182 exynos_gem_obj
= exynos_drm_gem_create(dev
, args
->flags
, args
->size
);
183 if (IS_ERR(exynos_gem_obj
))
184 return PTR_ERR(exynos_gem_obj
);
186 ret
= exynos_drm_gem_handle_create(&exynos_gem_obj
->base
, file_priv
,
189 exynos_drm_gem_destroy(exynos_gem_obj
);
196 dma_addr_t
*exynos_drm_gem_get_dma_addr(struct drm_device
*dev
,
197 unsigned int gem_handle
,
198 struct drm_file
*filp
)
200 struct exynos_drm_gem_obj
*exynos_gem_obj
;
201 struct drm_gem_object
*obj
;
203 obj
= drm_gem_object_lookup(dev
, filp
, gem_handle
);
205 DRM_ERROR("failed to lookup gem object.\n");
206 return ERR_PTR(-EINVAL
);
209 exynos_gem_obj
= to_exynos_gem_obj(obj
);
211 return &exynos_gem_obj
->buffer
->dma_addr
;
214 void exynos_drm_gem_put_dma_addr(struct drm_device
*dev
,
215 unsigned int gem_handle
,
216 struct drm_file
*filp
)
218 struct drm_gem_object
*obj
;
220 obj
= drm_gem_object_lookup(dev
, filp
, gem_handle
);
222 DRM_ERROR("failed to lookup gem object.\n");
226 drm_gem_object_unreference_unlocked(obj
);
229 * decrease obj->refcount one more time because we has already
230 * increased it at exynos_drm_gem_get_dma_addr().
232 drm_gem_object_unreference_unlocked(obj
);
235 int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj
*exynos_gem_obj
,
236 struct vm_area_struct
*vma
)
238 struct drm_device
*drm_dev
= exynos_gem_obj
->base
.dev
;
239 struct exynos_drm_gem_buf
*buffer
;
240 unsigned long vm_size
;
243 vma
->vm_flags
&= ~VM_PFNMAP
;
246 vm_size
= vma
->vm_end
- vma
->vm_start
;
249 * a buffer contains information to physically continuous memory
250 * allocated by user request or at framebuffer creation.
252 buffer
= exynos_gem_obj
->buffer
;
254 /* check if user-requested size is valid. */
255 if (vm_size
> buffer
->size
)
258 ret
= dma_mmap_attrs(drm_dev
->dev
, vma
, buffer
->pages
,
259 buffer
->dma_addr
, buffer
->size
,
262 DRM_ERROR("failed to mmap.\n");
269 int exynos_drm_gem_get_ioctl(struct drm_device
*dev
, void *data
,
270 struct drm_file
*file_priv
)
271 { struct exynos_drm_gem_obj
*exynos_gem_obj
;
272 struct drm_exynos_gem_info
*args
= data
;
273 struct drm_gem_object
*obj
;
275 mutex_lock(&dev
->struct_mutex
);
277 obj
= drm_gem_object_lookup(dev
, file_priv
, args
->handle
);
279 DRM_ERROR("failed to lookup gem object.\n");
280 mutex_unlock(&dev
->struct_mutex
);
284 exynos_gem_obj
= to_exynos_gem_obj(obj
);
286 args
->flags
= exynos_gem_obj
->flags
;
287 args
->size
= exynos_gem_obj
->size
;
289 drm_gem_object_unreference(obj
);
290 mutex_unlock(&dev
->struct_mutex
);
295 struct vm_area_struct
*exynos_gem_get_vma(struct vm_area_struct
*vma
)
297 struct vm_area_struct
*vma_copy
;
299 vma_copy
= kmalloc(sizeof(*vma_copy
), GFP_KERNEL
);
303 if (vma
->vm_ops
&& vma
->vm_ops
->open
)
304 vma
->vm_ops
->open(vma
);
307 get_file(vma
->vm_file
);
309 memcpy(vma_copy
, vma
, sizeof(*vma
));
311 vma_copy
->vm_mm
= NULL
;
312 vma_copy
->vm_next
= NULL
;
313 vma_copy
->vm_prev
= NULL
;
318 void exynos_gem_put_vma(struct vm_area_struct
*vma
)
323 if (vma
->vm_ops
&& vma
->vm_ops
->close
)
324 vma
->vm_ops
->close(vma
);
332 int exynos_gem_get_pages_from_userptr(unsigned long start
,
335 struct vm_area_struct
*vma
)
339 /* the memory region mmaped with VM_PFNMAP. */
340 if (vma_is_io(vma
)) {
343 for (i
= 0; i
< npages
; ++i
, start
+= PAGE_SIZE
) {
345 int ret
= follow_pfn(vma
, start
, &pfn
);
349 pages
[i
] = pfn_to_page(pfn
);
353 DRM_ERROR("failed to get user_pages.\n");
360 get_npages
= get_user_pages(current
, current
->mm
, start
,
361 npages
, 1, 1, pages
, NULL
);
362 get_npages
= max(get_npages
, 0);
363 if (get_npages
!= npages
) {
364 DRM_ERROR("failed to get user_pages.\n");
366 put_page(pages
[--get_npages
]);
373 void exynos_gem_put_pages_to_userptr(struct page
**pages
,
375 struct vm_area_struct
*vma
)
377 if (!vma_is_io(vma
)) {
380 for (i
= 0; i
< npages
; i
++) {
381 set_page_dirty_lock(pages
[i
]);
384 * undo the reference we took when populating
392 int exynos_gem_map_sgt_with_dma(struct drm_device
*drm_dev
,
393 struct sg_table
*sgt
,
394 enum dma_data_direction dir
)
398 mutex_lock(&drm_dev
->struct_mutex
);
400 nents
= dma_map_sg(drm_dev
->dev
, sgt
->sgl
, sgt
->nents
, dir
);
402 DRM_ERROR("failed to map sgl with dma.\n");
403 mutex_unlock(&drm_dev
->struct_mutex
);
407 mutex_unlock(&drm_dev
->struct_mutex
);
411 void exynos_gem_unmap_sgt_from_dma(struct drm_device
*drm_dev
,
412 struct sg_table
*sgt
,
413 enum dma_data_direction dir
)
415 dma_unmap_sg(drm_dev
->dev
, sgt
->sgl
, sgt
->nents
, dir
);
418 void exynos_drm_gem_free_object(struct drm_gem_object
*obj
)
420 struct exynos_drm_gem_obj
*exynos_gem_obj
;
421 struct exynos_drm_gem_buf
*buf
;
423 exynos_gem_obj
= to_exynos_gem_obj(obj
);
424 buf
= exynos_gem_obj
->buffer
;
426 exynos_drm_gem_destroy(to_exynos_gem_obj(obj
));
429 int exynos_drm_gem_dumb_create(struct drm_file
*file_priv
,
430 struct drm_device
*dev
,
431 struct drm_mode_create_dumb
*args
)
433 struct exynos_drm_gem_obj
*exynos_gem_obj
;
437 * allocate memory to be used for framebuffer.
438 * - this callback would be called by user application
439 * with DRM_IOCTL_MODE_CREATE_DUMB command.
442 args
->pitch
= args
->width
* ((args
->bpp
+ 7) / 8);
443 args
->size
= args
->pitch
* args
->height
;
445 if (is_drm_iommu_supported(dev
)) {
446 exynos_gem_obj
= exynos_drm_gem_create(dev
,
447 EXYNOS_BO_NONCONTIG
| EXYNOS_BO_WC
,
450 exynos_gem_obj
= exynos_drm_gem_create(dev
,
451 EXYNOS_BO_CONTIG
| EXYNOS_BO_WC
,
455 if (IS_ERR(exynos_gem_obj
)) {
456 dev_warn(dev
->dev
, "FB allocation failed.\n");
457 return PTR_ERR(exynos_gem_obj
);
460 ret
= exynos_drm_gem_handle_create(&exynos_gem_obj
->base
, file_priv
,
463 exynos_drm_gem_destroy(exynos_gem_obj
);
470 int exynos_drm_gem_dumb_map_offset(struct drm_file
*file_priv
,
471 struct drm_device
*dev
, uint32_t handle
,
474 struct drm_gem_object
*obj
;
477 mutex_lock(&dev
->struct_mutex
);
480 * get offset of memory allocated for drm framebuffer.
481 * - this callback would be called by user application
482 * with DRM_IOCTL_MODE_MAP_DUMB command.
485 obj
= drm_gem_object_lookup(dev
, file_priv
, handle
);
487 DRM_ERROR("failed to lookup gem object.\n");
492 ret
= drm_gem_create_mmap_offset(obj
);
496 *offset
= drm_vma_node_offset_addr(&obj
->vma_node
);
497 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset
);
500 drm_gem_object_unreference(obj
);
502 mutex_unlock(&dev
->struct_mutex
);
506 int exynos_drm_gem_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
508 struct drm_gem_object
*obj
= vma
->vm_private_data
;
509 struct exynos_drm_gem_obj
*exynos_gem_obj
= to_exynos_gem_obj(obj
);
510 struct exynos_drm_gem_buf
*buf
= exynos_gem_obj
->buffer
;
515 page_offset
= ((unsigned long)vmf
->virtual_address
-
516 vma
->vm_start
) >> PAGE_SHIFT
;
518 if (page_offset
>= (buf
->size
>> PAGE_SHIFT
)) {
519 DRM_ERROR("invalid page offset\n");
524 pfn
= page_to_pfn(buf
->pages
[page_offset
]);
525 ret
= vm_insert_mixed(vma
, (unsigned long)vmf
->virtual_address
, pfn
);
532 return VM_FAULT_NOPAGE
;
536 return VM_FAULT_SIGBUS
;
540 int exynos_drm_gem_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
542 struct exynos_drm_gem_obj
*exynos_gem_obj
;
543 struct drm_gem_object
*obj
;
546 /* set vm_area_struct. */
547 ret
= drm_gem_mmap(filp
, vma
);
549 DRM_ERROR("failed to mmap.\n");
553 obj
= vma
->vm_private_data
;
554 exynos_gem_obj
= to_exynos_gem_obj(obj
);
556 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem_obj
->flags
);
558 /* non-cachable as default. */
559 if (exynos_gem_obj
->flags
& EXYNOS_BO_CACHABLE
)
560 vma
->vm_page_prot
= vm_get_page_prot(vma
->vm_flags
);
561 else if (exynos_gem_obj
->flags
& EXYNOS_BO_WC
)
563 pgprot_writecombine(vm_get_page_prot(vma
->vm_flags
));
566 pgprot_noncached(vm_get_page_prot(vma
->vm_flags
));
568 ret
= exynos_drm_gem_mmap_buffer(exynos_gem_obj
, vma
);
575 drm_gem_vm_close(vma
);
576 drm_gem_free_mmap_offset(obj
);
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