2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
17 #include <drm/drm_gem.h>
18 #include <drm/drm_vma_manager.h>
20 #include <linux/dma-buf.h>
21 #include <linux/iommu.h>
23 #include "rockchip_drm_drv.h"
24 #include "rockchip_drm_gem.h"
26 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
28 struct drm_device *drm = rk_obj->base.dev;
29 struct rockchip_drm_private *private = drm->dev_private;
30 int prot = IOMMU_READ | IOMMU_WRITE;
33 mutex_lock(&private->mm_lock);
34 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
35 rk_obj->base.size, PAGE_SIZE,
37 mutex_unlock(&private->mm_lock);
40 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
44 rk_obj->dma_addr = rk_obj->mm.start;
46 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
47 rk_obj->sgt->nents, prot);
48 if (ret < rk_obj->base.size) {
49 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
50 ret, rk_obj->base.size);
60 mutex_lock(&private->mm_lock);
61 drm_mm_remove_node(&rk_obj->mm);
62 mutex_unlock(&private->mm_lock);
67 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
69 struct drm_device *drm = rk_obj->base.dev;
70 struct rockchip_drm_private *private = drm->dev_private;
72 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
74 mutex_lock(&private->mm_lock);
76 drm_mm_remove_node(&rk_obj->mm);
78 mutex_unlock(&private->mm_lock);
83 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
85 struct drm_device *drm = rk_obj->base.dev;
87 struct scatterlist *s;
89 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
90 if (IS_ERR(rk_obj->pages))
91 return PTR_ERR(rk_obj->pages);
93 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
95 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
96 if (IS_ERR(rk_obj->sgt)) {
97 ret = PTR_ERR(rk_obj->sgt);
102 * Fake up the SG table so that dma_sync_sg_for_device() can be used
103 * to flush the pages associated with it.
105 * TODO: Replace this by drm_clflush_sg() once it can be implemented
106 * without relying on symbols that are not exported.
108 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
109 sg_dma_address(s) = sg_phys(s);
111 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
117 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
121 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
123 sg_free_table(rk_obj->sgt);
125 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
128 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
133 ret = rockchip_gem_get_pages(rk_obj);
137 ret = rockchip_gem_iommu_map(rk_obj);
142 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
143 pgprot_writecombine(PAGE_KERNEL));
144 if (!rk_obj->kvaddr) {
145 DRM_ERROR("failed to vmap() buffer\n");
154 rockchip_gem_iommu_unmap(rk_obj);
156 rockchip_gem_put_pages(rk_obj);
161 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
164 struct drm_gem_object *obj = &rk_obj->base;
165 struct drm_device *drm = obj->dev;
167 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
170 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
172 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
173 &rk_obj->dma_addr, GFP_KERNEL,
175 if (!rk_obj->kvaddr) {
176 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
183 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
186 struct drm_gem_object *obj = &rk_obj->base;
187 struct drm_device *drm = obj->dev;
188 struct rockchip_drm_private *private = drm->dev_private;
191 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
193 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
196 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
198 vunmap(rk_obj->kvaddr);
199 rockchip_gem_iommu_unmap(rk_obj);
200 rockchip_gem_put_pages(rk_obj);
203 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
205 struct drm_gem_object *obj = &rk_obj->base;
206 struct drm_device *drm = obj->dev;
208 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
212 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
215 rockchip_gem_free_iommu(rk_obj);
217 rockchip_gem_free_dma(rk_obj);
220 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
221 struct vm_area_struct *vma)
223 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
224 unsigned int count = obj->size >> PAGE_SHIFT;
225 unsigned long user_count = vma_pages(vma);
230 return vm_map_pages(vma, rk_obj->pages, count);
233 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
234 struct vm_area_struct *vma)
236 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
237 struct drm_device *drm = obj->dev;
239 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
240 obj->size, rk_obj->dma_attrs);
243 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
244 struct vm_area_struct *vma)
247 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
250 * We allocated a struct page table for rk_obj, so clear
251 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
253 vma->vm_flags &= ~VM_PFNMAP;
256 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
258 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
261 drm_gem_vm_close(vma);
266 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
267 struct vm_area_struct *vma)
271 ret = drm_gem_mmap_obj(obj, obj->size, vma);
275 return rockchip_drm_gem_object_mmap(obj, vma);
278 /* drm driver mmap file operations */
279 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
281 struct drm_gem_object *obj;
284 ret = drm_gem_mmap(filp, vma);
289 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
290 * whole buffer from the start.
294 obj = vma->vm_private_data;
296 return rockchip_drm_gem_object_mmap(obj, vma);
299 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
301 drm_gem_object_release(&rk_obj->base);
305 struct rockchip_gem_object *
306 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
308 struct rockchip_gem_object *rk_obj;
309 struct drm_gem_object *obj;
311 size = round_up(size, PAGE_SIZE);
313 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
315 return ERR_PTR(-ENOMEM);
319 drm_gem_object_init(drm, obj, size);
324 struct rockchip_gem_object *
325 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
328 struct rockchip_gem_object *rk_obj;
331 rk_obj = rockchip_gem_alloc_object(drm, size);
335 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
337 goto err_free_rk_obj;
342 rockchip_gem_release_object(rk_obj);
347 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object_unlocked
350 void rockchip_gem_free_object(struct drm_gem_object *obj)
352 struct drm_device *drm = obj->dev;
353 struct rockchip_drm_private *private = drm->dev_private;
354 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
356 if (obj->import_attach) {
357 if (private->domain) {
358 rockchip_gem_iommu_unmap(rk_obj);
360 dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
361 rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
363 drm_prime_gem_destroy(obj, rk_obj->sgt);
365 rockchip_gem_free_buf(rk_obj);
368 rockchip_gem_release_object(rk_obj);
372 * rockchip_gem_create_with_handle - allocate an object with the given
373 * size and create a gem handle on it
375 * returns a struct rockchip_gem_object* on success or ERR_PTR values
378 static struct rockchip_gem_object *
379 rockchip_gem_create_with_handle(struct drm_file *file_priv,
380 struct drm_device *drm, unsigned int size,
381 unsigned int *handle)
383 struct rockchip_gem_object *rk_obj;
384 struct drm_gem_object *obj;
387 rk_obj = rockchip_gem_create_object(drm, size, false);
389 return ERR_CAST(rk_obj);
394 * allocate a id of idr table where the obj is registered
395 * and handle has the id what user can see.
397 ret = drm_gem_handle_create(file_priv, obj, handle);
399 goto err_handle_create;
401 /* drop reference from allocate - handle holds it now. */
402 drm_gem_object_put_unlocked(obj);
407 rockchip_gem_free_object(obj);
413 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
416 * This aligns the pitch and size arguments to the minimum required. wrap
417 * this into your own function if you need bigger alignment.
419 int rockchip_gem_dumb_create(struct drm_file *file_priv,
420 struct drm_device *dev,
421 struct drm_mode_create_dumb *args)
423 struct rockchip_gem_object *rk_obj;
424 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
427 * align to 64 bytes since Mali requires it.
429 args->pitch = ALIGN(min_pitch, 64);
430 args->size = args->pitch * args->height;
432 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
435 return PTR_ERR_OR_ZERO(rk_obj);
439 * Allocate a sg_table for this GEM object.
440 * Note: Both the table's contents, and the sg_table itself must be freed by
442 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
444 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
446 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
447 struct drm_device *drm = obj->dev;
448 struct sg_table *sgt;
452 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
454 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
456 return ERR_PTR(-ENOMEM);
458 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
459 rk_obj->dma_addr, obj->size,
462 DRM_ERROR("failed to allocate sgt, %d\n", ret);
470 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
473 struct scatterlist *s;
474 dma_addr_t expected = sg_dma_address(sgt->sgl);
476 unsigned long size = 0;
478 for_each_sg(sgt->sgl, s, count, i) {
479 if (sg_dma_address(s) != expected)
481 expected = sg_dma_address(s) + sg_dma_len(s);
482 size += sg_dma_len(s);
488 rockchip_gem_iommu_map_sg(struct drm_device *drm,
489 struct dma_buf_attachment *attach,
491 struct rockchip_gem_object *rk_obj)
494 return rockchip_gem_iommu_map(rk_obj);
498 rockchip_gem_dma_map_sg(struct drm_device *drm,
499 struct dma_buf_attachment *attach,
501 struct rockchip_gem_object *rk_obj)
503 int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
508 if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
509 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
510 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
515 rk_obj->dma_addr = sg_dma_address(sg->sgl);
520 struct drm_gem_object *
521 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
522 struct dma_buf_attachment *attach,
525 struct rockchip_drm_private *private = drm->dev_private;
526 struct rockchip_gem_object *rk_obj;
529 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
531 return ERR_CAST(rk_obj);
534 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
536 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
539 DRM_ERROR("failed to import sg table: %d\n", ret);
540 goto err_free_rk_obj;
543 return &rk_obj->base;
546 rockchip_gem_release_object(rk_obj);
550 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
552 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
555 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
556 pgprot_writecombine(PAGE_KERNEL));
558 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
561 return rk_obj->kvaddr;
564 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
566 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
573 /* Nothing to do if allocated by DMA mapping API. */