1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Author: Inki Dae <inki.dae@samsung.com>
9 #include <linux/dma-buf.h>
10 #include <linux/pfn_t.h>
11 #include <linux/shmem_fs.h>
13 #include <drm/drm_prime.h>
14 #include <drm/drm_vma_manager.h>
15 #include <drm/exynos_drm.h>
17 #include "exynos_drm_drv.h"
18 #include "exynos_drm_gem.h"
20 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
22 struct drm_device *dev = exynos_gem->base.dev;
24 unsigned int nr_pages;
28 if (exynos_gem->dma_addr) {
29 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
33 exynos_gem->dma_attrs = 0;
36 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
37 * region will be allocated else physically contiguous
40 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
41 exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
44 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
45 * else cachable mapping.
47 if (exynos_gem->flags & EXYNOS_BO_WC ||
48 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
49 attr = DMA_ATTR_WRITE_COMBINE;
51 attr = DMA_ATTR_NON_CONSISTENT;
53 exynos_gem->dma_attrs |= attr;
54 exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
56 nr_pages = exynos_gem->size >> PAGE_SHIFT;
58 exynos_gem->pages = kvmalloc_array(nr_pages, sizeof(struct page *),
59 GFP_KERNEL | __GFP_ZERO);
60 if (!exynos_gem->pages) {
61 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate pages.\n");
65 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
66 &exynos_gem->dma_addr, GFP_KERNEL,
67 exynos_gem->dma_attrs);
68 if (!exynos_gem->cookie) {
69 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
73 ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
74 exynos_gem->dma_addr, exynos_gem->size,
75 exynos_gem->dma_attrs);
77 DRM_DEV_ERROR(to_dma_dev(dev), "failed to get sgtable.\n");
81 if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
83 DRM_DEV_ERROR(to_dma_dev(dev), "invalid sgtable.\n");
90 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
91 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
98 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
99 exynos_gem->dma_addr, exynos_gem->dma_attrs);
101 kvfree(exynos_gem->pages);
106 static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
108 struct drm_device *dev = exynos_gem->base.dev;
110 if (!exynos_gem->dma_addr) {
111 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
115 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
116 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
118 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
119 (dma_addr_t)exynos_gem->dma_addr,
120 exynos_gem->dma_attrs);
122 kvfree(exynos_gem->pages);
125 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
126 struct drm_file *file_priv,
127 unsigned int *handle)
132 * allocate a id of idr table where the obj is registered
133 * and handle has the id what user can see.
135 ret = drm_gem_handle_create(file_priv, obj, handle);
139 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
141 /* drop reference from allocate - handle holds it now. */
142 drm_gem_object_put_unlocked(obj);
147 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
149 struct drm_gem_object *obj = &exynos_gem->base;
151 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
155 * do not release memory region from exporter.
157 * the region will be released by exporter
158 * once dmabuf's refcount becomes 0.
160 if (obj->import_attach)
161 drm_prime_gem_destroy(obj, exynos_gem->sgt);
163 exynos_drm_free_buf(exynos_gem);
165 /* release file pointer to gem object. */
166 drm_gem_object_release(obj);
171 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
174 struct exynos_drm_gem *exynos_gem;
175 struct drm_gem_object *obj;
178 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
180 return ERR_PTR(-ENOMEM);
182 exynos_gem->size = size;
183 obj = &exynos_gem->base;
185 ret = drm_gem_object_init(dev, obj, size);
187 DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
192 ret = drm_gem_create_mmap_offset(obj);
194 drm_gem_object_release(obj);
199 DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
204 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
208 struct exynos_drm_gem *exynos_gem;
211 if (flags & ~(EXYNOS_BO_MASK)) {
212 DRM_DEV_ERROR(dev->dev,
213 "invalid GEM buffer flags: %u\n", flags);
214 return ERR_PTR(-EINVAL);
218 DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
219 return ERR_PTR(-EINVAL);
222 size = roundup(size, PAGE_SIZE);
224 exynos_gem = exynos_drm_gem_init(dev, size);
225 if (IS_ERR(exynos_gem))
228 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
230 * when no IOMMU is available, all allocated buffers are
231 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
233 flags &= ~EXYNOS_BO_NONCONTIG;
234 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
237 /* set memory type and cache attribute from user side. */
238 exynos_gem->flags = flags;
240 ret = exynos_drm_alloc_buf(exynos_gem);
242 drm_gem_object_release(&exynos_gem->base);
250 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
251 struct drm_file *file_priv)
253 struct drm_exynos_gem_create *args = data;
254 struct exynos_drm_gem *exynos_gem;
257 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
258 if (IS_ERR(exynos_gem))
259 return PTR_ERR(exynos_gem);
261 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
264 exynos_drm_gem_destroy(exynos_gem);
271 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
272 struct drm_file *file_priv)
274 struct drm_exynos_gem_map *args = data;
276 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
280 struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
281 unsigned int gem_handle)
283 struct drm_gem_object *obj;
285 obj = drm_gem_object_lookup(filp, gem_handle);
288 return to_exynos_gem(obj);
291 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
292 struct vm_area_struct *vma)
294 struct drm_device *drm_dev = exynos_gem->base.dev;
295 unsigned long vm_size;
298 vma->vm_flags &= ~VM_PFNMAP;
301 vm_size = vma->vm_end - vma->vm_start;
303 /* check if user-requested size is valid. */
304 if (vm_size > exynos_gem->size)
307 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
308 exynos_gem->dma_addr, exynos_gem->size,
309 exynos_gem->dma_attrs);
311 DRM_ERROR("failed to mmap.\n");
318 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
319 struct drm_file *file_priv)
321 struct exynos_drm_gem *exynos_gem;
322 struct drm_exynos_gem_info *args = data;
323 struct drm_gem_object *obj;
325 obj = drm_gem_object_lookup(file_priv, args->handle);
327 DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
331 exynos_gem = to_exynos_gem(obj);
333 args->flags = exynos_gem->flags;
334 args->size = exynos_gem->size;
336 drm_gem_object_put_unlocked(obj);
341 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
343 exynos_drm_gem_destroy(to_exynos_gem(obj));
346 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
347 struct drm_device *dev,
348 struct drm_mode_create_dumb *args)
350 struct exynos_drm_gem *exynos_gem;
355 * allocate memory to be used for framebuffer.
356 * - this callback would be called by user application
357 * with DRM_IOCTL_MODE_CREATE_DUMB command.
360 args->pitch = args->width * ((args->bpp + 7) / 8);
361 args->size = args->pitch * args->height;
363 if (is_drm_iommu_supported(dev))
364 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
366 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
368 exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
369 if (IS_ERR(exynos_gem)) {
370 dev_warn(dev->dev, "FB allocation failed.\n");
371 return PTR_ERR(exynos_gem);
374 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
377 exynos_drm_gem_destroy(exynos_gem);
384 vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf)
386 struct vm_area_struct *vma = vmf->vma;
387 struct drm_gem_object *obj = vma->vm_private_data;
388 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
392 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
394 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
395 DRM_ERROR("invalid page offset\n");
396 return VM_FAULT_SIGBUS;
399 pfn = page_to_pfn(exynos_gem->pages[page_offset]);
400 return vmf_insert_mixed(vma, vmf->address,
401 __pfn_to_pfn_t(pfn, PFN_DEV));
404 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
405 struct vm_area_struct *vma)
407 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
410 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
413 /* non-cachable as default. */
414 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
415 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
416 else if (exynos_gem->flags & EXYNOS_BO_WC)
418 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
421 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
423 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
430 drm_gem_vm_close(vma);
435 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
437 struct drm_gem_object *obj;
440 /* set vm_area_struct. */
441 ret = drm_gem_mmap(filp, vma);
443 DRM_ERROR("failed to mmap.\n");
447 obj = vma->vm_private_data;
449 if (obj->import_attach)
450 return dma_buf_mmap(obj->dma_buf, vma, 0);
452 return exynos_drm_gem_mmap_obj(obj, vma);
455 /* low-level interface prime helpers */
456 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
457 struct dma_buf *dma_buf)
459 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
462 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
464 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
467 npages = exynos_gem->size >> PAGE_SHIFT;
469 return drm_prime_pages_to_sg(exynos_gem->pages, npages);
472 struct drm_gem_object *
473 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
474 struct dma_buf_attachment *attach,
475 struct sg_table *sgt)
477 struct exynos_drm_gem *exynos_gem;
481 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
482 if (IS_ERR(exynos_gem)) {
483 ret = PTR_ERR(exynos_gem);
487 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
489 npages = exynos_gem->size >> PAGE_SHIFT;
490 exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
491 if (!exynos_gem->pages) {
496 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
501 exynos_gem->sgt = sgt;
503 if (sgt->nents == 1) {
504 /* always physically continuous memory if sgt->nents is 1. */
505 exynos_gem->flags |= EXYNOS_BO_CONTIG;
508 * this case could be CONTIG or NONCONTIG type but for now
510 * TODO. we have to find a way that exporter can notify
511 * the type of its own buffer to importer.
513 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
516 return &exynos_gem->base;
519 kvfree(exynos_gem->pages);
521 drm_gem_object_release(&exynos_gem->base);
526 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
531 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
536 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
537 struct vm_area_struct *vma)
541 ret = drm_gem_mmap_obj(obj, obj->size, vma);
545 return exynos_drm_gem_mmap_obj(obj, vma);