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_sync_helper.h>
19 #include <drm/drm_vma_manager.h>
20 #include <drm/rockchip_drm.h>
22 #include <linux/completion.h>
23 #include <linux/dma-attrs.h>
24 #include <linux/dma-buf.h>
25 #include <linux/reservation.h>
26 #include <linux/iommu.h>
28 #include "rockchip_drm_drv.h"
29 #include "rockchip_drm_gem.h"
31 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
33 struct drm_device *drm = rk_obj->base.dev;
34 struct rockchip_drm_private *private = drm->dev_private;
35 int prot = IOMMU_READ | IOMMU_WRITE;
38 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
39 rk_obj->base.size, PAGE_SIZE,
42 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
46 rk_obj->dma_addr = rk_obj->mm.start;
48 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
49 rk_obj->sgt->nents, prot);
51 DRM_ERROR("failed to map buffer: %zd\n", ret);
60 drm_mm_remove_node(&rk_obj->mm);
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);
71 drm_mm_remove_node(&rk_obj->mm);
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->pages, rk_obj->num_pages);
89 if (IS_ERR(rk_obj->sgt)) {
90 ret = PTR_ERR(rk_obj->sgt);
95 * Fake up the SG table so that dma_sync_sg_for_device() can be used
96 * to flush the pages associated with it.
98 * TODO: Replace this by drm_clflush_sg() once it can be implemented
99 * without relying on symbols that are not exported.
101 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
102 sg_dma_address(s) = sg_phys(s);
104 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
110 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
114 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
116 sg_free_table(rk_obj->sgt);
118 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
121 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
126 ret = rockchip_gem_get_pages(rk_obj);
130 ret = rockchip_gem_iommu_map(rk_obj);
135 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
136 pgprot_writecombine(PAGE_KERNEL));
137 if (!rk_obj->kvaddr) {
138 DRM_ERROR("failed to vmap() buffer\n");
147 rockchip_gem_iommu_unmap(rk_obj);
149 rockchip_gem_put_pages(rk_obj);
154 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
157 struct drm_gem_object *obj = &rk_obj->base;
158 struct drm_device *drm = obj->dev;
160 init_dma_attrs(&rk_obj->dma_attrs);
161 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
164 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
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,
203 rk_obj->dma_addr, &rk_obj->dma_attrs);
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 i, count = obj->size >> PAGE_SHIFT;
219 unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
220 unsigned long uaddr = vma->vm_start;
223 if (user_count == 0 || user_count > count)
226 for (i = 0; i < user_count; i++) {
227 ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
236 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
237 struct vm_area_struct *vma)
239 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
240 struct drm_device *drm = obj->dev;
242 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
243 obj->size, &rk_obj->dma_attrs);
246 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
247 struct vm_area_struct *vma)
250 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
253 * We allocated a struct page table for rk_obj, so clear
254 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
256 vma->vm_flags &= ~VM_PFNMAP;
260 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
262 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
265 drm_gem_vm_close(vma);
270 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
271 struct vm_area_struct *vma)
275 ret = drm_gem_mmap_obj(obj, obj->size, vma);
279 return rockchip_drm_gem_object_mmap(obj, vma);
282 /* drm driver mmap file operations */
283 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
285 struct drm_gem_object *obj;
288 ret = drm_gem_mmap(filp, vma);
292 obj = vma->vm_private_data;
294 return rockchip_drm_gem_object_mmap(obj, vma);
297 struct rockchip_gem_object *
298 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
301 struct rockchip_gem_object *rk_obj;
302 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);
315 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
317 goto err_free_rk_obj;
327 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
330 void rockchip_gem_free_object(struct drm_gem_object *obj)
332 struct rockchip_gem_object *rk_obj;
334 drm_gem_free_mmap_offset(obj);
336 rk_obj = to_rockchip_obj(obj);
338 rockchip_gem_free_buf(rk_obj);
340 #ifdef CONFIG_DRM_DMA_SYNC
341 drm_fence_signal_and_put(&rk_obj->acquire_fence);
348 * rockchip_gem_create_with_handle - allocate an object with the given
349 * size and create a gem handle on it
351 * returns a struct rockchip_gem_object* on success or ERR_PTR values
354 static struct rockchip_gem_object *
355 rockchip_gem_create_with_handle(struct drm_file *file_priv,
356 struct drm_device *drm, unsigned int size,
357 unsigned int *handle)
359 struct rockchip_gem_object *rk_obj;
360 struct drm_gem_object *obj;
363 rk_obj = rockchip_gem_create_object(drm, size, false);
365 return ERR_CAST(rk_obj);
370 * allocate a id of idr table where the obj is registered
371 * and handle has the id what user can see.
373 ret = drm_gem_handle_create(file_priv, obj, handle);
375 goto err_handle_create;
377 /* drop reference from allocate - handle holds it now. */
378 drm_gem_object_unreference_unlocked(obj);
383 rockchip_gem_free_object(obj);
388 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
389 struct drm_device *dev, uint32_t handle,
392 struct drm_gem_object *obj;
395 obj = drm_gem_object_lookup(dev, file_priv, handle);
397 DRM_ERROR("failed to lookup gem object.\n");
401 ret = drm_gem_create_mmap_offset(obj);
405 *offset = drm_vma_node_offset_addr(&obj->vma_node);
406 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
409 drm_gem_object_unreference_unlocked(obj);
415 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
418 * This aligns the pitch and size arguments to the minimum required. wrap
419 * this into your own function if you need bigger alignment.
421 int rockchip_gem_dumb_create(struct drm_file *file_priv,
422 struct drm_device *dev,
423 struct drm_mode_create_dumb *args)
425 struct rockchip_gem_object *rk_obj;
426 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
429 * align to 64 bytes since Mali requires it.
431 args->pitch = ALIGN(min_pitch, 64);
432 args->size = args->pitch * args->height;
434 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
437 return PTR_ERR_OR_ZERO(rk_obj);
440 int rockchip_gem_map_offset_ioctl(struct drm_device *drm, void *data,
441 struct drm_file *file_priv)
443 struct drm_rockchip_gem_map_off *args = data;
445 return rockchip_gem_dumb_map_offset(file_priv, drm, args->handle,
449 int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
450 struct drm_file *file_priv)
452 struct drm_rockchip_gem_create *args = data;
453 struct rockchip_gem_object *rk_obj;
455 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
457 return PTR_ERR_OR_ZERO(rk_obj);
460 static struct reservation_object *drm_gem_get_resv(struct drm_gem_object *gem)
462 struct dma_buf *dma_buf = gem->dma_buf;
463 return dma_buf ? dma_buf->resv : NULL;
466 #ifdef CONFIG_DRM_DMA_SYNC
467 static void rockchip_gem_acquire_complete(struct drm_reservation_cb *rcb,
470 struct completion *compl = context;
474 static int rockchip_gem_acquire(struct drm_device *dev,
475 struct rockchip_gem_object *rockchip_gem_obj,
479 struct rockchip_drm_private *dev_priv = dev->dev_private;
480 struct reservation_object *resv =
481 drm_gem_get_resv(&rockchip_gem_obj->base);
483 struct drm_reservation_cb rcb;
484 DECLARE_COMPLETION_ONSTACK(compl);
490 !rockchip_gem_obj->acquire_exclusive &&
491 rockchip_gem_obj->acquire_fence) {
492 atomic_inc(&rockchip_gem_obj->acquire_shared_count);
496 fence = drm_sw_fence_new(dev_priv->cpu_fence_context,
497 atomic_add_return(1, &dev_priv->cpu_fence_seqno));
499 ret = PTR_ERR(fence);
500 DRM_ERROR("Failed to create acquire fence %d.\n", ret);
503 ww_mutex_lock(&resv->lock, NULL);
505 ret = reservation_object_reserve_shared(resv);
507 DRM_ERROR("Failed to reserve space for shared fence %d.\n",
512 drm_reservation_cb_init(&rcb, rockchip_gem_acquire_complete, &compl);
513 ret = drm_reservation_cb_add(&rcb, resv, exclusive);
515 DRM_ERROR("Failed to add reservation to callback %d.\n", ret);
518 drm_reservation_cb_done(&rcb);
520 reservation_object_add_excl_fence(resv, fence);
522 reservation_object_add_shared_fence(resv, fence);
524 ww_mutex_unlock(&resv->lock);
525 mutex_unlock(&dev->struct_mutex);
526 ret = wait_for_completion_interruptible(&compl);
527 mutex_lock(&dev->struct_mutex);
529 DRM_ERROR("Failed wait for reservation callback %d.\n", ret);
530 drm_reservation_cb_fini(&rcb);
531 /* somebody else may be already waiting on it */
532 drm_fence_signal_and_put(&fence);
535 rockchip_gem_obj->acquire_fence = fence;
536 rockchip_gem_obj->acquire_exclusive = exclusive;
537 atomic_set(&rockchip_gem_obj->acquire_shared_count, 1);
541 ww_mutex_unlock(&resv->lock);
546 static void rockchip_gem_release(struct rockchip_gem_object *rockchip_gem_obj)
548 BUG_ON(!rockchip_gem_obj->acquire_fence);
549 if (atomic_sub_and_test(1,
550 &rockchip_gem_obj->acquire_shared_count))
551 drm_fence_signal_and_put(&rockchip_gem_obj->acquire_fence);
555 int rockchip_gem_cpu_acquire_ioctl(struct drm_device *dev, void *data,
556 struct drm_file *file)
558 struct drm_rockchip_gem_cpu_acquire *args = data;
559 struct rockchip_drm_file_private *file_priv = file->driver_priv;
560 struct drm_gem_object *obj;
561 struct rockchip_gem_object *rockchip_gem_obj;
562 struct rockchip_gem_object_node *gem_node;
565 DRM_DEBUG_KMS("[BO:%u] flags: 0x%x\n", args->handle, args->flags);
567 mutex_lock(&dev->struct_mutex);
569 obj = drm_gem_object_lookup(dev, file, args->handle);
571 DRM_ERROR("failed to lookup gem object.\n");
576 rockchip_gem_obj = to_rockchip_obj(obj);
578 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
579 /* If there is no reservation object present, there is no
580 * cross-process/cross-device sharing and sync is unnecessary.
586 #ifdef CONFIG_DRM_DMA_SYNC
587 ret = rockchip_gem_acquire(dev, rockchip_gem_obj,
588 args->flags & DRM_ROCKCHIP_GEM_CPU_ACQUIRE_EXCLUSIVE);
593 gem_node = kzalloc(sizeof(*gem_node), GFP_KERNEL);
595 DRM_ERROR("Failed to allocate rockchip_drm_gem_obj_node.\n");
600 gem_node->rockchip_gem_obj = rockchip_gem_obj;
601 list_add(&gem_node->list, &file_priv->gem_cpu_acquire_list);
602 mutex_unlock(&dev->struct_mutex);
606 #ifdef CONFIG_DRM_DMA_SYNC
607 rockchip_gem_release(rockchip_gem_obj);
610 drm_gem_object_unreference(obj);
613 mutex_unlock(&dev->struct_mutex);
617 int rockchip_gem_cpu_release_ioctl(struct drm_device *dev, void *data,
618 struct drm_file *file)
620 struct drm_rockchip_gem_cpu_release *args = data;
621 struct rockchip_drm_file_private *file_priv = file->driver_priv;
622 struct drm_gem_object *obj;
623 struct rockchip_gem_object *rockchip_gem_obj;
624 struct list_head *cur;
627 DRM_DEBUG_KMS("[BO:%u]\n", args->handle);
629 mutex_lock(&dev->struct_mutex);
631 obj = drm_gem_object_lookup(dev, file, args->handle);
633 DRM_ERROR("failed to lookup gem object.\n");
638 rockchip_gem_obj = to_rockchip_obj(obj);
640 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
641 /* If there is no reservation object present, there is no
642 * cross-process/cross-device sharing and sync is unnecessary.
648 list_for_each(cur, &file_priv->gem_cpu_acquire_list) {
649 struct rockchip_gem_object_node *node = list_entry(
650 cur, struct rockchip_gem_object_node, list);
651 if (node->rockchip_gem_obj == rockchip_gem_obj)
654 if (cur == &file_priv->gem_cpu_acquire_list) {
655 DRM_ERROR("gem object not acquired for current process.\n");
660 #ifdef CONFIG_DRM_DMA_SYNC
661 rockchip_gem_release(rockchip_gem_obj);
665 kfree(list_entry(cur, struct rockchip_gem_object_node, list));
666 /* unreference for the reference held since cpu_acquire_ioctl */
667 drm_gem_object_unreference(obj);
671 /* unreference for the reference from drm_gem_object_lookup() */
672 drm_gem_object_unreference(obj);
675 mutex_unlock(&dev->struct_mutex);
680 * Allocate a sg_table for this GEM object.
681 * Note: Both the table's contents, and the sg_table itself must be freed by
683 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
685 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
687 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
688 struct drm_device *drm = obj->dev;
689 struct sg_table *sgt;
693 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
695 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
697 return ERR_PTR(-ENOMEM);
699 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
700 rk_obj->dma_addr, obj->size,
703 DRM_ERROR("failed to allocate sgt, %d\n", ret);
711 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
713 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
716 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
717 pgprot_writecombine(PAGE_KERNEL));
719 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
722 return rk_obj->kvaddr;
725 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
727 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
734 /* Nothing to do if allocated by DMA mapping API. */