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, bool kvmap)
22 struct drm_device *dev = exynos_gem->base.dev;
23 unsigned long attr = 0;
25 if (exynos_gem->dma_addr) {
26 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
31 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
32 * region will be allocated else physically contiguous
35 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
36 attr |= DMA_ATTR_FORCE_CONTIGUOUS;
39 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
40 * else cachable mapping.
42 if (exynos_gem->flags & EXYNOS_BO_WC ||
43 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
44 attr |= DMA_ATTR_WRITE_COMBINE;
46 /* FBDev emulation requires kernel mapping */
48 attr |= DMA_ATTR_NO_KERNEL_MAPPING;
50 exynos_gem->dma_attrs = attr;
51 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
52 &exynos_gem->dma_addr, GFP_KERNEL,
53 exynos_gem->dma_attrs);
54 if (!exynos_gem->cookie) {
55 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
60 exynos_gem->kvaddr = exynos_gem->cookie;
62 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
63 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
67 static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
69 struct drm_device *dev = exynos_gem->base.dev;
71 if (!exynos_gem->dma_addr) {
72 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
76 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
77 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
79 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
80 (dma_addr_t)exynos_gem->dma_addr,
81 exynos_gem->dma_attrs);
84 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
85 struct drm_file *file_priv,
91 * allocate a id of idr table where the obj is registered
92 * and handle has the id what user can see.
94 ret = drm_gem_handle_create(file_priv, obj, handle);
98 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
100 /* drop reference from allocate - handle holds it now. */
101 drm_gem_object_put(obj);
106 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
108 struct drm_gem_object *obj = &exynos_gem->base;
110 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
114 * do not release memory region from exporter.
116 * the region will be released by exporter
117 * once dmabuf's refcount becomes 0.
119 if (obj->import_attach)
120 drm_prime_gem_destroy(obj, exynos_gem->sgt);
122 exynos_drm_free_buf(exynos_gem);
124 /* release file pointer to gem object. */
125 drm_gem_object_release(obj);
130 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
131 .open = drm_gem_vm_open,
132 .close = drm_gem_vm_close,
135 static const struct drm_gem_object_funcs exynos_drm_gem_object_funcs = {
136 .free = exynos_drm_gem_free_object,
137 .get_sg_table = exynos_drm_gem_prime_get_sg_table,
138 .vmap = exynos_drm_gem_prime_vmap,
139 .vunmap = exynos_drm_gem_prime_vunmap,
140 .vm_ops = &exynos_drm_gem_vm_ops,
143 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
146 struct exynos_drm_gem *exynos_gem;
147 struct drm_gem_object *obj;
150 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
152 return ERR_PTR(-ENOMEM);
154 exynos_gem->size = size;
155 obj = &exynos_gem->base;
157 obj->funcs = &exynos_drm_gem_object_funcs;
159 ret = drm_gem_object_init(dev, obj, size);
161 DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
166 ret = drm_gem_create_mmap_offset(obj);
168 drm_gem_object_release(obj);
173 DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
178 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
183 struct exynos_drm_gem *exynos_gem;
186 if (flags & ~(EXYNOS_BO_MASK)) {
187 DRM_DEV_ERROR(dev->dev,
188 "invalid GEM buffer flags: %u\n", flags);
189 return ERR_PTR(-EINVAL);
193 DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
194 return ERR_PTR(-EINVAL);
197 size = roundup(size, PAGE_SIZE);
199 exynos_gem = exynos_drm_gem_init(dev, size);
200 if (IS_ERR(exynos_gem))
203 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
205 * when no IOMMU is available, all allocated buffers are
206 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
208 flags &= ~EXYNOS_BO_NONCONTIG;
209 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
212 /* set memory type and cache attribute from user side. */
213 exynos_gem->flags = flags;
215 ret = exynos_drm_alloc_buf(exynos_gem, kvmap);
217 drm_gem_object_release(&exynos_gem->base);
225 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
226 struct drm_file *file_priv)
228 struct drm_exynos_gem_create *args = data;
229 struct exynos_drm_gem *exynos_gem;
232 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size, false);
233 if (IS_ERR(exynos_gem))
234 return PTR_ERR(exynos_gem);
236 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
239 exynos_drm_gem_destroy(exynos_gem);
246 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
247 struct drm_file *file_priv)
249 struct drm_exynos_gem_map *args = data;
251 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
255 struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
256 unsigned int gem_handle)
258 struct drm_gem_object *obj;
260 obj = drm_gem_object_lookup(filp, gem_handle);
263 return to_exynos_gem(obj);
266 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
267 struct vm_area_struct *vma)
269 struct drm_device *drm_dev = exynos_gem->base.dev;
270 unsigned long vm_size;
273 vma->vm_flags &= ~VM_PFNMAP;
276 vm_size = vma->vm_end - vma->vm_start;
278 /* check if user-requested size is valid. */
279 if (vm_size > exynos_gem->size)
282 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
283 exynos_gem->dma_addr, exynos_gem->size,
284 exynos_gem->dma_attrs);
286 DRM_ERROR("failed to mmap.\n");
293 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
294 struct drm_file *file_priv)
296 struct exynos_drm_gem *exynos_gem;
297 struct drm_exynos_gem_info *args = data;
298 struct drm_gem_object *obj;
300 obj = drm_gem_object_lookup(file_priv, args->handle);
302 DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
306 exynos_gem = to_exynos_gem(obj);
308 args->flags = exynos_gem->flags;
309 args->size = exynos_gem->size;
311 drm_gem_object_put(obj);
316 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
318 exynos_drm_gem_destroy(to_exynos_gem(obj));
321 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
322 struct drm_device *dev,
323 struct drm_mode_create_dumb *args)
325 struct exynos_drm_gem *exynos_gem;
330 * allocate memory to be used for framebuffer.
331 * - this callback would be called by user application
332 * with DRM_IOCTL_MODE_CREATE_DUMB command.
335 args->pitch = args->width * ((args->bpp + 7) / 8);
336 args->size = args->pitch * args->height;
338 if (is_drm_iommu_supported(dev))
339 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
341 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
343 exynos_gem = exynos_drm_gem_create(dev, flags, args->size, false);
344 if (IS_ERR(exynos_gem)) {
345 dev_warn(dev->dev, "FB allocation failed.\n");
346 return PTR_ERR(exynos_gem);
349 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
352 exynos_drm_gem_destroy(exynos_gem);
359 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
360 struct vm_area_struct *vma)
362 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
365 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
368 /* non-cachable as default. */
369 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
370 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
371 else if (exynos_gem->flags & EXYNOS_BO_WC)
373 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
376 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
378 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
385 drm_gem_vm_close(vma);
390 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
392 struct drm_gem_object *obj;
395 /* set vm_area_struct. */
396 ret = drm_gem_mmap(filp, vma);
398 DRM_ERROR("failed to mmap.\n");
402 obj = vma->vm_private_data;
404 if (obj->import_attach)
405 return dma_buf_mmap(obj->dma_buf, vma, 0);
407 return exynos_drm_gem_mmap_obj(obj, vma);
410 /* low-level interface prime helpers */
411 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
412 struct dma_buf *dma_buf)
414 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
417 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
419 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
420 struct drm_device *drm_dev = obj->dev;
421 struct sg_table *sgt;
424 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
426 return ERR_PTR(-ENOMEM);
428 ret = dma_get_sgtable_attrs(to_dma_dev(drm_dev), sgt, exynos_gem->cookie,
429 exynos_gem->dma_addr, exynos_gem->size,
430 exynos_gem->dma_attrs);
432 DRM_ERROR("failed to get sgtable, %d\n", ret);
440 struct drm_gem_object *
441 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
442 struct dma_buf_attachment *attach,
443 struct sg_table *sgt)
445 struct exynos_drm_gem *exynos_gem;
447 /* check if the entries in the sg_table are contiguous */
448 if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
449 DRM_ERROR("buffer chunks must be mapped contiguously");
450 return ERR_PTR(-EINVAL);
453 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
454 if (IS_ERR(exynos_gem))
455 return ERR_CAST(exynos_gem);
458 * Buffer has been mapped as contiguous into DMA address space,
459 * but if there is IOMMU, it can be either CONTIG or NONCONTIG.
460 * We assume a simplified logic below:
462 if (is_drm_iommu_supported(dev))
463 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
465 exynos_gem->flags |= EXYNOS_BO_CONTIG;
467 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
468 exynos_gem->sgt = sgt;
469 return &exynos_gem->base;
472 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
477 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
482 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
483 struct vm_area_struct *vma)
487 ret = drm_gem_mmap_obj(obj, obj->size, vma);
491 return exynos_drm_gem_mmap_obj(obj, vma);