1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4 * Author:Mark Yao <mark.yao@rock-chips.com>
7 #include <linux/dma-buf.h>
8 #include <linux/iommu.h>
9 #include <linux/vmalloc.h>
12 #include <drm/drm_gem.h>
13 #include <drm/drm_prime.h>
14 #include <drm/drm_vma_manager.h>
16 #include "rockchip_drm_drv.h"
17 #include "rockchip_drm_gem.h"
19 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
21 struct drm_device *drm = rk_obj->base.dev;
22 struct rockchip_drm_private *private = drm->dev_private;
23 int prot = IOMMU_READ | IOMMU_WRITE;
26 mutex_lock(&private->mm_lock);
27 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
28 rk_obj->base.size, PAGE_SIZE,
30 mutex_unlock(&private->mm_lock);
33 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
37 rk_obj->dma_addr = rk_obj->mm.start;
39 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
40 rk_obj->sgt->nents, prot);
41 if (ret < rk_obj->base.size) {
42 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
43 ret, rk_obj->base.size);
53 mutex_lock(&private->mm_lock);
54 drm_mm_remove_node(&rk_obj->mm);
55 mutex_unlock(&private->mm_lock);
60 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
62 struct drm_device *drm = rk_obj->base.dev;
63 struct rockchip_drm_private *private = drm->dev_private;
65 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
67 mutex_lock(&private->mm_lock);
69 drm_mm_remove_node(&rk_obj->mm);
71 mutex_unlock(&private->mm_lock);
76 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
78 struct drm_device *drm = rk_obj->base.dev;
80 struct scatterlist *s;
82 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
83 if (IS_ERR(rk_obj->pages))
84 return PTR_ERR(rk_obj->pages);
86 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
88 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev,
89 rk_obj->pages, rk_obj->num_pages);
90 if (IS_ERR(rk_obj->sgt)) {
91 ret = PTR_ERR(rk_obj->sgt);
96 * Fake up the SG table so that dma_sync_sg_for_device() can be used
97 * to flush the pages associated with it.
99 * TODO: Replace this by drm_clflush_sg() once it can be implemented
100 * without relying on symbols that are not exported.
102 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
103 sg_dma_address(s) = sg_phys(s);
105 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
111 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
115 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
117 sg_free_table(rk_obj->sgt);
119 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
122 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
127 ret = rockchip_gem_get_pages(rk_obj);
131 ret = rockchip_gem_iommu_map(rk_obj);
136 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
137 pgprot_writecombine(PAGE_KERNEL));
138 if (!rk_obj->kvaddr) {
139 DRM_ERROR("failed to vmap() buffer\n");
148 rockchip_gem_iommu_unmap(rk_obj);
150 rockchip_gem_put_pages(rk_obj);
155 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
158 struct drm_gem_object *obj = &rk_obj->base;
159 struct drm_device *drm = obj->dev;
161 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
164 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
166 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
167 &rk_obj->dma_addr, GFP_KERNEL,
169 if (!rk_obj->kvaddr) {
170 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
177 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
180 struct drm_gem_object *obj = &rk_obj->base;
181 struct drm_device *drm = obj->dev;
182 struct rockchip_drm_private *private = drm->dev_private;
185 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
187 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
190 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
192 vunmap(rk_obj->kvaddr);
193 rockchip_gem_iommu_unmap(rk_obj);
194 rockchip_gem_put_pages(rk_obj);
197 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
199 struct drm_gem_object *obj = &rk_obj->base;
200 struct drm_device *drm = obj->dev;
202 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
206 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
209 rockchip_gem_free_iommu(rk_obj);
211 rockchip_gem_free_dma(rk_obj);
214 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
215 struct vm_area_struct *vma)
217 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
218 unsigned int count = obj->size >> PAGE_SHIFT;
219 unsigned long user_count = vma_pages(vma);
224 return vm_map_pages(vma, rk_obj->pages, count);
227 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
228 struct vm_area_struct *vma)
230 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
231 struct drm_device *drm = obj->dev;
233 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
234 obj->size, rk_obj->dma_attrs);
237 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
238 struct vm_area_struct *vma)
241 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
244 * We allocated a struct page table for rk_obj, so clear
245 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
247 vma->vm_flags &= ~VM_PFNMAP;
250 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
252 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
255 drm_gem_vm_close(vma);
260 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
261 struct vm_area_struct *vma)
265 ret = drm_gem_mmap_obj(obj, obj->size, vma);
269 return rockchip_drm_gem_object_mmap(obj, vma);
272 /* drm driver mmap file operations */
273 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
275 struct drm_gem_object *obj;
278 ret = drm_gem_mmap(filp, vma);
283 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
284 * whole buffer from the start.
288 obj = vma->vm_private_data;
290 return rockchip_drm_gem_object_mmap(obj, vma);
293 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
295 drm_gem_object_release(&rk_obj->base);
299 static struct rockchip_gem_object *
300 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
302 struct rockchip_gem_object *rk_obj;
303 struct drm_gem_object *obj;
305 size = round_up(size, PAGE_SIZE);
307 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
309 return ERR_PTR(-ENOMEM);
313 drm_gem_object_init(drm, obj, size);
318 struct rockchip_gem_object *
319 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
322 struct rockchip_gem_object *rk_obj;
325 rk_obj = rockchip_gem_alloc_object(drm, 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_unlocked
344 void rockchip_gem_free_object(struct drm_gem_object *obj)
346 struct drm_device *drm = obj->dev;
347 struct rockchip_drm_private *private = drm->dev_private;
348 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
350 if (obj->import_attach) {
351 if (private->domain) {
352 rockchip_gem_iommu_unmap(rk_obj);
354 dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
355 rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
357 drm_prime_gem_destroy(obj, rk_obj->sgt);
359 rockchip_gem_free_buf(rk_obj);
362 rockchip_gem_release_object(rk_obj);
366 * rockchip_gem_create_with_handle - allocate an object with the given
367 * size and create a gem handle on it
369 * returns a struct rockchip_gem_object* on success or ERR_PTR values
372 static struct rockchip_gem_object *
373 rockchip_gem_create_with_handle(struct drm_file *file_priv,
374 struct drm_device *drm, unsigned int size,
375 unsigned int *handle)
377 struct rockchip_gem_object *rk_obj;
378 struct drm_gem_object *obj;
381 rk_obj = rockchip_gem_create_object(drm, size, false);
383 return ERR_CAST(rk_obj);
388 * allocate a id of idr table where the obj is registered
389 * and handle has the id what user can see.
391 ret = drm_gem_handle_create(file_priv, obj, handle);
393 goto err_handle_create;
395 /* drop reference from allocate - handle holds it now. */
396 drm_gem_object_put(obj);
401 rockchip_gem_free_object(obj);
407 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
410 * This aligns the pitch and size arguments to the minimum required. wrap
411 * this into your own function if you need bigger alignment.
413 int rockchip_gem_dumb_create(struct drm_file *file_priv,
414 struct drm_device *dev,
415 struct drm_mode_create_dumb *args)
417 struct rockchip_gem_object *rk_obj;
418 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
421 * align to 64 bytes since Mali requires it.
423 args->pitch = ALIGN(min_pitch, 64);
424 args->size = args->pitch * args->height;
426 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
429 return PTR_ERR_OR_ZERO(rk_obj);
433 * Allocate a sg_table for this GEM object.
434 * Note: Both the table's contents, and the sg_table itself must be freed by
436 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
438 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
440 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
441 struct drm_device *drm = obj->dev;
442 struct sg_table *sgt;
446 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages);
448 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
450 return ERR_PTR(-ENOMEM);
452 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
453 rk_obj->dma_addr, obj->size,
456 DRM_ERROR("failed to allocate sgt, %d\n", ret);
464 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
467 struct scatterlist *s;
468 dma_addr_t expected = sg_dma_address(sgt->sgl);
470 unsigned long size = 0;
472 for_each_sg(sgt->sgl, s, count, i) {
473 if (sg_dma_address(s) != expected)
475 expected = sg_dma_address(s) + sg_dma_len(s);
476 size += sg_dma_len(s);
482 rockchip_gem_iommu_map_sg(struct drm_device *drm,
483 struct dma_buf_attachment *attach,
485 struct rockchip_gem_object *rk_obj)
488 return rockchip_gem_iommu_map(rk_obj);
492 rockchip_gem_dma_map_sg(struct drm_device *drm,
493 struct dma_buf_attachment *attach,
495 struct rockchip_gem_object *rk_obj)
497 int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
502 if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
503 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
504 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
509 rk_obj->dma_addr = sg_dma_address(sg->sgl);
514 struct drm_gem_object *
515 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
516 struct dma_buf_attachment *attach,
519 struct rockchip_drm_private *private = drm->dev_private;
520 struct rockchip_gem_object *rk_obj;
523 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
525 return ERR_CAST(rk_obj);
528 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
530 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
533 DRM_ERROR("failed to import sg table: %d\n", ret);
534 goto err_free_rk_obj;
537 return &rk_obj->base;
540 rockchip_gem_release_object(rk_obj);
544 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
546 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
549 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
550 pgprot_writecombine(PAGE_KERNEL));
552 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
555 return rk_obj->kvaddr;
558 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
560 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
567 /* Nothing to do if allocated by DMA mapping API. */