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>
19 #include <linux/iommu.h>
21 #include "rockchip_drm_drv.h"
22 #include "rockchip_drm_gem.h"
24 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
26 struct drm_device *drm = rk_obj->base.dev;
27 struct rockchip_drm_private *private = drm->dev_private;
28 int prot = IOMMU_READ | IOMMU_WRITE;
31 mutex_lock(&private->mm_lock);
32 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
33 rk_obj->base.size, PAGE_SIZE,
35 mutex_unlock(&private->mm_lock);
38 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
42 rk_obj->dma_addr = rk_obj->mm.start;
44 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
45 rk_obj->sgt->nents, prot);
46 if (ret < rk_obj->base.size) {
47 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
48 ret, rk_obj->base.size);
58 mutex_lock(&private->mm_lock);
59 drm_mm_remove_node(&rk_obj->mm);
60 mutex_unlock(&private->mm_lock);
65 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
67 struct drm_device *drm = rk_obj->base.dev;
68 struct rockchip_drm_private *private = drm->dev_private;
70 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
72 mutex_lock(&private->mm_lock);
74 drm_mm_remove_node(&rk_obj->mm);
76 mutex_unlock(&private->mm_lock);
81 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
83 struct drm_device *drm = rk_obj->base.dev;
85 struct scatterlist *s;
87 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
88 if (IS_ERR(rk_obj->pages))
89 return PTR_ERR(rk_obj->pages);
91 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
93 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
94 if (IS_ERR(rk_obj->sgt)) {
95 ret = PTR_ERR(rk_obj->sgt);
100 * Fake up the SG table so that dma_sync_sg_for_device() can be used
101 * to flush the pages associated with it.
103 * TODO: Replace this by drm_clflush_sg() once it can be implemented
104 * without relying on symbols that are not exported.
106 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
107 sg_dma_address(s) = sg_phys(s);
109 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
115 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
119 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
121 sg_free_table(rk_obj->sgt);
123 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
126 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
131 ret = rockchip_gem_get_pages(rk_obj);
135 ret = rockchip_gem_iommu_map(rk_obj);
140 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
141 pgprot_writecombine(PAGE_KERNEL));
142 if (!rk_obj->kvaddr) {
143 DRM_ERROR("failed to vmap() buffer\n");
152 rockchip_gem_iommu_unmap(rk_obj);
154 rockchip_gem_put_pages(rk_obj);
159 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
162 struct drm_gem_object *obj = &rk_obj->base;
163 struct drm_device *drm = obj->dev;
165 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
168 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
170 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
171 &rk_obj->dma_addr, GFP_KERNEL,
173 if (!rk_obj->kvaddr) {
174 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
181 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
184 struct drm_gem_object *obj = &rk_obj->base;
185 struct drm_device *drm = obj->dev;
186 struct rockchip_drm_private *private = drm->dev_private;
189 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
191 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
194 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
196 vunmap(rk_obj->kvaddr);
197 rockchip_gem_iommu_unmap(rk_obj);
198 rockchip_gem_put_pages(rk_obj);
201 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
203 struct drm_gem_object *obj = &rk_obj->base;
204 struct drm_device *drm = obj->dev;
206 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
210 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
213 rockchip_gem_free_iommu(rk_obj);
215 rockchip_gem_free_dma(rk_obj);
218 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
219 struct vm_area_struct *vma)
221 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
222 unsigned int i, count = obj->size >> PAGE_SHIFT;
223 unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
224 unsigned long uaddr = vma->vm_start;
225 unsigned long offset = vma->vm_pgoff;
226 unsigned long end = user_count + offset;
234 for (i = offset; i < end; i++) {
235 ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
244 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
245 struct vm_area_struct *vma)
247 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
248 struct drm_device *drm = obj->dev;
250 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
251 obj->size, rk_obj->dma_attrs);
254 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
255 struct vm_area_struct *vma)
258 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
261 * We allocated a struct page table for rk_obj, so clear
262 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
264 vma->vm_flags &= ~VM_PFNMAP;
268 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
270 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
273 drm_gem_vm_close(vma);
278 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
279 struct vm_area_struct *vma)
283 ret = drm_gem_mmap_obj(obj, obj->size, vma);
287 return rockchip_drm_gem_object_mmap(obj, vma);
290 /* drm driver mmap file operations */
291 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
293 struct drm_gem_object *obj;
296 ret = drm_gem_mmap(filp, vma);
300 obj = vma->vm_private_data;
302 return rockchip_drm_gem_object_mmap(obj, vma);
305 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
307 drm_gem_object_release(&rk_obj->base);
311 struct rockchip_gem_object *
312 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
315 struct rockchip_gem_object *rk_obj;
316 struct drm_gem_object *obj;
319 size = round_up(size, PAGE_SIZE);
321 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
323 return ERR_PTR(-ENOMEM);
327 drm_gem_object_init(drm, obj, size);
329 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
331 goto err_free_rk_obj;
336 rockchip_gem_release_object(rk_obj);
341 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
344 void rockchip_gem_free_object(struct drm_gem_object *obj)
346 struct rockchip_gem_object *rk_obj;
348 rk_obj = to_rockchip_obj(obj);
350 rockchip_gem_free_buf(rk_obj);
352 rockchip_gem_release_object(rk_obj);
356 * rockchip_gem_create_with_handle - allocate an object with the given
357 * size and create a gem handle on it
359 * returns a struct rockchip_gem_object* on success or ERR_PTR values
362 static struct rockchip_gem_object *
363 rockchip_gem_create_with_handle(struct drm_file *file_priv,
364 struct drm_device *drm, unsigned int size,
365 unsigned int *handle)
367 struct rockchip_gem_object *rk_obj;
368 struct drm_gem_object *obj;
371 rk_obj = rockchip_gem_create_object(drm, size, false);
373 return ERR_CAST(rk_obj);
378 * allocate a id of idr table where the obj is registered
379 * and handle has the id what user can see.
381 ret = drm_gem_handle_create(file_priv, obj, handle);
383 goto err_handle_create;
385 /* drop reference from allocate - handle holds it now. */
386 drm_gem_object_unreference_unlocked(obj);
391 rockchip_gem_free_object(obj);
396 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
397 struct drm_device *dev, uint32_t handle,
400 struct drm_gem_object *obj;
403 obj = drm_gem_object_lookup(file_priv, handle);
405 DRM_ERROR("failed to lookup gem object.\n");
409 ret = drm_gem_create_mmap_offset(obj);
413 *offset = drm_vma_node_offset_addr(&obj->vma_node);
414 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
417 drm_gem_object_unreference_unlocked(obj);
423 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
426 * This aligns the pitch and size arguments to the minimum required. wrap
427 * this into your own function if you need bigger alignment.
429 int rockchip_gem_dumb_create(struct drm_file *file_priv,
430 struct drm_device *dev,
431 struct drm_mode_create_dumb *args)
433 struct rockchip_gem_object *rk_obj;
434 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
437 * align to 64 bytes since Mali requires it.
439 args->pitch = ALIGN(min_pitch, 64);
440 args->size = args->pitch * args->height;
442 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
445 return PTR_ERR_OR_ZERO(rk_obj);
449 * Allocate a sg_table for this GEM object.
450 * Note: Both the table's contents, and the sg_table itself must be freed by
452 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
454 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
456 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
457 struct drm_device *drm = obj->dev;
458 struct sg_table *sgt;
462 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
464 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
466 return ERR_PTR(-ENOMEM);
468 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
469 rk_obj->dma_addr, obj->size,
472 DRM_ERROR("failed to allocate sgt, %d\n", ret);
480 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
482 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
485 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
486 pgprot_writecombine(PAGE_KERNEL));
488 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
491 return rk_obj->kvaddr;
494 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
496 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
503 /* Nothing to do if allocated by DMA mapping API. */