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 <linux/dma-buf.h>
17 #include <drm/exynos_drm.h>
19 #include "exynos_drm_drv.h"
20 #include "exynos_drm_gem.h"
21 #include "exynos_drm_iommu.h"
23 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
25 struct drm_device *dev = exynos_gem->base.dev;
27 unsigned int nr_pages;
31 if (exynos_gem->dma_addr) {
32 DRM_DEBUG_KMS("already allocated.\n");
36 init_dma_attrs(&exynos_gem->dma_attrs);
39 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
40 * region will be allocated else physically contiguous
43 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
44 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
47 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
48 * else cachable mapping.
50 if (exynos_gem->flags & EXYNOS_BO_WC ||
51 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
52 attr = DMA_ATTR_WRITE_COMBINE;
54 attr = DMA_ATTR_NON_CONSISTENT;
56 dma_set_attr(attr, &exynos_gem->dma_attrs);
57 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
59 nr_pages = exynos_gem->size >> PAGE_SHIFT;
61 exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
62 if (!exynos_gem->pages) {
63 DRM_ERROR("failed to allocate pages.\n");
67 exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size,
68 &exynos_gem->dma_addr, GFP_KERNEL,
69 &exynos_gem->dma_attrs);
70 if (!exynos_gem->cookie) {
71 DRM_ERROR("failed to allocate buffer.\n");
75 ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie,
76 exynos_gem->dma_addr, exynos_gem->size,
77 &exynos_gem->dma_attrs);
79 DRM_ERROR("failed to get sgtable.\n");
83 if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
85 DRM_ERROR("invalid sgtable.\n");
92 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
93 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
100 dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
101 exynos_gem->dma_addr, &exynos_gem->dma_attrs);
103 drm_free_large(exynos_gem->pages);
108 static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
110 struct drm_device *dev = exynos_gem->base.dev;
112 if (!exynos_gem->dma_addr) {
113 DRM_DEBUG_KMS("dma_addr is invalid.\n");
117 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
118 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
120 dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
121 (dma_addr_t)exynos_gem->dma_addr,
122 &exynos_gem->dma_attrs);
124 drm_free_large(exynos_gem->pages);
127 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
128 struct drm_file *file_priv,
129 unsigned int *handle)
134 * allocate a id of idr table where the obj is registered
135 * and handle has the id what user can see.
137 ret = drm_gem_handle_create(file_priv, obj, handle);
141 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
143 /* drop reference from allocate - handle holds it now. */
144 drm_gem_object_unreference_unlocked(obj);
149 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
151 struct drm_gem_object *obj = &exynos_gem->base;
153 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
156 * do not release memory region from exporter.
158 * the region will be released by exporter
159 * once dmabuf's refcount becomes 0.
161 if (obj->import_attach)
162 drm_prime_gem_destroy(obj, exynos_gem->sgt);
164 exynos_drm_free_buf(exynos_gem);
166 /* release file pointer to gem object. */
167 drm_gem_object_release(obj);
172 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
173 unsigned int gem_handle,
174 struct drm_file *file_priv)
176 struct exynos_drm_gem *exynos_gem;
177 struct drm_gem_object *obj;
179 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
181 DRM_ERROR("failed to lookup gem object.\n");
185 exynos_gem = to_exynos_gem(obj);
187 drm_gem_object_unreference_unlocked(obj);
189 return exynos_gem->size;
192 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
195 struct exynos_drm_gem *exynos_gem;
196 struct drm_gem_object *obj;
199 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
201 return ERR_PTR(-ENOMEM);
203 exynos_gem->size = size;
204 obj = &exynos_gem->base;
206 ret = drm_gem_object_init(dev, obj, size);
208 DRM_ERROR("failed to initialize gem object\n");
213 ret = drm_gem_create_mmap_offset(obj);
215 drm_gem_object_release(obj);
220 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
225 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
229 struct exynos_drm_gem *exynos_gem;
232 if (flags & ~(EXYNOS_BO_MASK)) {
233 DRM_ERROR("invalid flags.\n");
234 return ERR_PTR(-EINVAL);
238 DRM_ERROR("invalid size.\n");
239 return ERR_PTR(-EINVAL);
242 size = roundup(size, PAGE_SIZE);
244 exynos_gem = exynos_drm_gem_init(dev, size);
245 if (IS_ERR(exynos_gem))
248 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
250 * when no IOMMU is available, all allocated buffers are
251 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
253 flags &= ~EXYNOS_BO_NONCONTIG;
254 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
257 /* set memory type and cache attribute from user side. */
258 exynos_gem->flags = flags;
260 ret = exynos_drm_alloc_buf(exynos_gem);
262 drm_gem_object_release(&exynos_gem->base);
270 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
271 struct drm_file *file_priv)
273 struct drm_exynos_gem_create *args = data;
274 struct exynos_drm_gem *exynos_gem;
277 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
278 if (IS_ERR(exynos_gem))
279 return PTR_ERR(exynos_gem);
281 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
284 exynos_drm_gem_destroy(exynos_gem);
291 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
292 unsigned int gem_handle,
293 struct drm_file *filp)
295 struct exynos_drm_gem *exynos_gem;
296 struct drm_gem_object *obj;
298 obj = drm_gem_object_lookup(dev, filp, gem_handle);
300 DRM_ERROR("failed to lookup gem object.\n");
301 return ERR_PTR(-EINVAL);
304 exynos_gem = to_exynos_gem(obj);
306 return &exynos_gem->dma_addr;
309 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
310 unsigned int gem_handle,
311 struct drm_file *filp)
313 struct drm_gem_object *obj;
315 obj = drm_gem_object_lookup(dev, filp, gem_handle);
317 DRM_ERROR("failed to lookup gem object.\n");
321 drm_gem_object_unreference_unlocked(obj);
324 * decrease obj->refcount one more time because we has already
325 * increased it at exynos_drm_gem_get_dma_addr().
327 drm_gem_object_unreference_unlocked(obj);
330 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
331 struct vm_area_struct *vma)
333 struct drm_device *drm_dev = exynos_gem->base.dev;
334 unsigned long vm_size;
337 vma->vm_flags &= ~VM_PFNMAP;
340 vm_size = vma->vm_end - vma->vm_start;
342 /* check if user-requested size is valid. */
343 if (vm_size > exynos_gem->size)
346 ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->pages,
347 exynos_gem->dma_addr, exynos_gem->size,
348 &exynos_gem->dma_attrs);
350 DRM_ERROR("failed to mmap.\n");
357 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
358 struct drm_file *file_priv)
360 struct exynos_drm_gem *exynos_gem;
361 struct drm_exynos_gem_info *args = data;
362 struct drm_gem_object *obj;
364 mutex_lock(&dev->struct_mutex);
366 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
368 DRM_ERROR("failed to lookup gem object.\n");
369 mutex_unlock(&dev->struct_mutex);
373 exynos_gem = to_exynos_gem(obj);
375 args->flags = exynos_gem->flags;
376 args->size = exynos_gem->size;
378 drm_gem_object_unreference(obj);
379 mutex_unlock(&dev->struct_mutex);
384 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
385 struct sg_table *sgt,
386 enum dma_data_direction dir)
390 mutex_lock(&drm_dev->struct_mutex);
392 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
394 DRM_ERROR("failed to map sgl with dma.\n");
395 mutex_unlock(&drm_dev->struct_mutex);
399 mutex_unlock(&drm_dev->struct_mutex);
403 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
404 struct sg_table *sgt,
405 enum dma_data_direction dir)
407 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
410 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
412 exynos_drm_gem_destroy(to_exynos_gem(obj));
415 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
416 struct drm_device *dev,
417 struct drm_mode_create_dumb *args)
419 struct exynos_drm_gem *exynos_gem;
424 * allocate memory to be used for framebuffer.
425 * - this callback would be called by user application
426 * with DRM_IOCTL_MODE_CREATE_DUMB command.
429 args->pitch = args->width * ((args->bpp + 7) / 8);
430 args->size = args->pitch * args->height;
432 if (is_drm_iommu_supported(dev))
433 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
435 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
437 exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
438 if (IS_ERR(exynos_gem)) {
439 dev_warn(dev->dev, "FB allocation failed.\n");
440 return PTR_ERR(exynos_gem);
443 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
446 exynos_drm_gem_destroy(exynos_gem);
453 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
454 struct drm_device *dev, uint32_t handle,
457 struct drm_gem_object *obj;
460 mutex_lock(&dev->struct_mutex);
463 * get offset of memory allocated for drm framebuffer.
464 * - this callback would be called by user application
465 * with DRM_IOCTL_MODE_MAP_DUMB command.
468 obj = drm_gem_object_lookup(dev, file_priv, handle);
470 DRM_ERROR("failed to lookup gem object.\n");
475 *offset = drm_vma_node_offset_addr(&obj->vma_node);
476 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
478 drm_gem_object_unreference(obj);
480 mutex_unlock(&dev->struct_mutex);
484 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
486 struct drm_gem_object *obj = vma->vm_private_data;
487 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
492 page_offset = ((unsigned long)vmf->virtual_address -
493 vma->vm_start) >> PAGE_SHIFT;
495 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
496 DRM_ERROR("invalid page offset\n");
501 pfn = page_to_pfn(exynos_gem->pages[page_offset]);
502 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
509 return VM_FAULT_NOPAGE;
513 return VM_FAULT_SIGBUS;
517 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
519 struct exynos_drm_gem *exynos_gem;
520 struct drm_gem_object *obj;
523 /* set vm_area_struct. */
524 ret = drm_gem_mmap(filp, vma);
526 DRM_ERROR("failed to mmap.\n");
530 obj = vma->vm_private_data;
531 exynos_gem = to_exynos_gem(obj);
533 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
535 /* non-cachable as default. */
536 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
537 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
538 else if (exynos_gem->flags & EXYNOS_BO_WC)
540 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
543 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
545 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
552 drm_gem_vm_close(vma);
557 /* low-level interface prime helpers */
558 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
560 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
563 npages = exynos_gem->size >> PAGE_SHIFT;
565 return drm_prime_pages_to_sg(exynos_gem->pages, npages);
568 struct drm_gem_object *
569 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
570 struct dma_buf_attachment *attach,
571 struct sg_table *sgt)
573 struct exynos_drm_gem *exynos_gem;
577 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
578 if (IS_ERR(exynos_gem)) {
579 ret = PTR_ERR(exynos_gem);
583 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
585 npages = exynos_gem->size >> PAGE_SHIFT;
586 exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
587 if (!exynos_gem->pages) {
592 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
597 exynos_gem->sgt = sgt;
599 if (sgt->nents == 1) {
600 /* always physically continuous memory if sgt->nents is 1. */
601 exynos_gem->flags |= EXYNOS_BO_CONTIG;
604 * this case could be CONTIG or NONCONTIG type but for now
606 * TODO. we have to find a way that exporter can notify
607 * the type of its own buffer to importer.
609 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
612 return &exynos_gem->base;
615 drm_free_large(exynos_gem->pages);
617 drm_gem_object_release(&exynos_gem->base);
622 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
627 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)