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 static struct rockchip_gem_object *
298 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
300 struct rockchip_gem_object *rk_obj;
301 struct drm_gem_object *obj;
303 size = round_up(size, PAGE_SIZE);
305 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
307 return ERR_PTR(-ENOMEM);
311 drm_gem_object_init(drm, obj, size);
316 struct rockchip_gem_object *
317 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
320 struct rockchip_gem_object *rk_obj;
323 rk_obj = rockchip_gem_alloc_object(drm, size);
327 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
329 goto err_free_rk_obj;
339 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
342 void rockchip_gem_free_object(struct drm_gem_object *obj)
344 struct drm_device *drm = obj->dev;
345 struct rockchip_drm_private *private = drm->dev_private;
346 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
348 drm_gem_free_mmap_offset(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 #ifdef CONFIG_DRM_DMA_SYNC
363 drm_fence_signal_and_put(&rk_obj->acquire_fence);
370 * rockchip_gem_create_with_handle - allocate an object with the given
371 * size and create a gem handle on it
373 * returns a struct rockchip_gem_object* on success or ERR_PTR values
376 static struct rockchip_gem_object *
377 rockchip_gem_create_with_handle(struct drm_file *file_priv,
378 struct drm_device *drm, unsigned int size,
379 unsigned int *handle)
381 struct rockchip_gem_object *rk_obj;
382 struct drm_gem_object *obj;
385 rk_obj = rockchip_gem_create_object(drm, size, false);
387 return ERR_CAST(rk_obj);
392 * allocate a id of idr table where the obj is registered
393 * and handle has the id what user can see.
395 ret = drm_gem_handle_create(file_priv, obj, handle);
397 goto err_handle_create;
399 /* drop reference from allocate - handle holds it now. */
400 drm_gem_object_unreference_unlocked(obj);
405 rockchip_gem_free_object(obj);
410 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
411 struct drm_device *dev, uint32_t handle,
414 struct drm_gem_object *obj;
417 obj = drm_gem_object_lookup(dev, file_priv, handle);
419 DRM_ERROR("failed to lookup gem object.\n");
423 ret = drm_gem_create_mmap_offset(obj);
427 *offset = drm_vma_node_offset_addr(&obj->vma_node);
428 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
431 drm_gem_object_unreference_unlocked(obj);
437 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
440 * This aligns the pitch and size arguments to the minimum required. wrap
441 * this into your own function if you need bigger alignment.
443 int rockchip_gem_dumb_create(struct drm_file *file_priv,
444 struct drm_device *dev,
445 struct drm_mode_create_dumb *args)
447 struct rockchip_gem_object *rk_obj;
448 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
451 * align to 64 bytes since Mali requires it.
453 args->pitch = ALIGN(min_pitch, 64);
454 args->size = args->pitch * args->height;
456 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
459 return PTR_ERR_OR_ZERO(rk_obj);
462 int rockchip_gem_map_offset_ioctl(struct drm_device *drm, void *data,
463 struct drm_file *file_priv)
465 struct drm_rockchip_gem_map_off *args = data;
467 return rockchip_gem_dumb_map_offset(file_priv, drm, args->handle,
471 int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
472 struct drm_file *file_priv)
474 struct drm_rockchip_gem_create *args = data;
475 struct rockchip_gem_object *rk_obj;
477 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
479 return PTR_ERR_OR_ZERO(rk_obj);
482 static struct reservation_object *drm_gem_get_resv(struct drm_gem_object *gem)
484 struct dma_buf *dma_buf = gem->dma_buf;
485 return dma_buf ? dma_buf->resv : NULL;
488 #ifdef CONFIG_DRM_DMA_SYNC
489 static void rockchip_gem_acquire_complete(struct drm_reservation_cb *rcb,
492 struct completion *compl = context;
496 static int rockchip_gem_acquire(struct drm_device *dev,
497 struct rockchip_gem_object *rockchip_gem_obj,
501 struct rockchip_drm_private *dev_priv = dev->dev_private;
502 struct reservation_object *resv =
503 drm_gem_get_resv(&rockchip_gem_obj->base);
505 struct drm_reservation_cb rcb;
506 DECLARE_COMPLETION_ONSTACK(compl);
512 !rockchip_gem_obj->acquire_exclusive &&
513 rockchip_gem_obj->acquire_fence) {
514 atomic_inc(&rockchip_gem_obj->acquire_shared_count);
518 fence = drm_sw_fence_new(dev_priv->cpu_fence_context,
519 atomic_add_return(1, &dev_priv->cpu_fence_seqno));
521 ret = PTR_ERR(fence);
522 DRM_ERROR("Failed to create acquire fence %d.\n", ret);
525 ww_mutex_lock(&resv->lock, NULL);
527 ret = reservation_object_reserve_shared(resv);
529 DRM_ERROR("Failed to reserve space for shared fence %d.\n",
534 drm_reservation_cb_init(&rcb, rockchip_gem_acquire_complete, &compl);
535 ret = drm_reservation_cb_add(&rcb, resv, exclusive);
537 DRM_ERROR("Failed to add reservation to callback %d.\n", ret);
540 drm_reservation_cb_done(&rcb);
542 reservation_object_add_excl_fence(resv, fence);
544 reservation_object_add_shared_fence(resv, fence);
546 ww_mutex_unlock(&resv->lock);
547 mutex_unlock(&dev->struct_mutex);
548 ret = wait_for_completion_interruptible(&compl);
549 mutex_lock(&dev->struct_mutex);
551 DRM_ERROR("Failed wait for reservation callback %d.\n", ret);
552 drm_reservation_cb_fini(&rcb);
553 /* somebody else may be already waiting on it */
554 drm_fence_signal_and_put(&fence);
557 rockchip_gem_obj->acquire_fence = fence;
558 rockchip_gem_obj->acquire_exclusive = exclusive;
559 atomic_set(&rockchip_gem_obj->acquire_shared_count, 1);
563 ww_mutex_unlock(&resv->lock);
568 static void rockchip_gem_release(struct rockchip_gem_object *rockchip_gem_obj)
570 BUG_ON(!rockchip_gem_obj->acquire_fence);
571 if (atomic_sub_and_test(1,
572 &rockchip_gem_obj->acquire_shared_count))
573 drm_fence_signal_and_put(&rockchip_gem_obj->acquire_fence);
577 int rockchip_gem_cpu_acquire_ioctl(struct drm_device *dev, void *data,
578 struct drm_file *file)
580 struct drm_rockchip_gem_cpu_acquire *args = data;
581 struct rockchip_drm_file_private *file_priv = file->driver_priv;
582 struct drm_gem_object *obj;
583 struct rockchip_gem_object *rockchip_gem_obj;
584 struct rockchip_gem_object_node *gem_node;
587 DRM_DEBUG_KMS("[BO:%u] flags: 0x%x\n", args->handle, args->flags);
589 mutex_lock(&dev->struct_mutex);
591 obj = drm_gem_object_lookup(dev, file, args->handle);
593 DRM_ERROR("failed to lookup gem object.\n");
598 rockchip_gem_obj = to_rockchip_obj(obj);
600 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
601 /* If there is no reservation object present, there is no
602 * cross-process/cross-device sharing and sync is unnecessary.
608 #ifdef CONFIG_DRM_DMA_SYNC
609 ret = rockchip_gem_acquire(dev, rockchip_gem_obj,
610 args->flags & DRM_ROCKCHIP_GEM_CPU_ACQUIRE_EXCLUSIVE);
615 gem_node = kzalloc(sizeof(*gem_node), GFP_KERNEL);
617 DRM_ERROR("Failed to allocate rockchip_drm_gem_obj_node.\n");
622 gem_node->rockchip_gem_obj = rockchip_gem_obj;
623 list_add(&gem_node->list, &file_priv->gem_cpu_acquire_list);
624 mutex_unlock(&dev->struct_mutex);
628 #ifdef CONFIG_DRM_DMA_SYNC
629 rockchip_gem_release(rockchip_gem_obj);
632 drm_gem_object_unreference(obj);
635 mutex_unlock(&dev->struct_mutex);
639 int rockchip_gem_cpu_release_ioctl(struct drm_device *dev, void *data,
640 struct drm_file *file)
642 struct drm_rockchip_gem_cpu_release *args = data;
643 struct rockchip_drm_file_private *file_priv = file->driver_priv;
644 struct drm_gem_object *obj;
645 struct rockchip_gem_object *rockchip_gem_obj;
646 struct list_head *cur;
649 DRM_DEBUG_KMS("[BO:%u]\n", args->handle);
651 mutex_lock(&dev->struct_mutex);
653 obj = drm_gem_object_lookup(dev, file, args->handle);
655 DRM_ERROR("failed to lookup gem object.\n");
660 rockchip_gem_obj = to_rockchip_obj(obj);
662 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
663 /* If there is no reservation object present, there is no
664 * cross-process/cross-device sharing and sync is unnecessary.
670 list_for_each(cur, &file_priv->gem_cpu_acquire_list) {
671 struct rockchip_gem_object_node *node = list_entry(
672 cur, struct rockchip_gem_object_node, list);
673 if (node->rockchip_gem_obj == rockchip_gem_obj)
676 if (cur == &file_priv->gem_cpu_acquire_list) {
677 DRM_ERROR("gem object not acquired for current process.\n");
682 #ifdef CONFIG_DRM_DMA_SYNC
683 rockchip_gem_release(rockchip_gem_obj);
687 kfree(list_entry(cur, struct rockchip_gem_object_node, list));
688 /* unreference for the reference held since cpu_acquire_ioctl */
689 drm_gem_object_unreference(obj);
693 /* unreference for the reference from drm_gem_object_lookup() */
694 drm_gem_object_unreference(obj);
697 mutex_unlock(&dev->struct_mutex);
702 * Allocate a sg_table for this GEM object.
703 * Note: Both the table's contents, and the sg_table itself must be freed by
705 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
707 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
709 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
710 struct drm_device *drm = obj->dev;
711 struct sg_table *sgt;
715 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
717 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
719 return ERR_PTR(-ENOMEM);
721 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
722 rk_obj->dma_addr, obj->size,
725 DRM_ERROR("failed to allocate sgt, %d\n", ret);
733 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
736 struct scatterlist *s;
737 dma_addr_t expected = sg_dma_address(sgt->sgl);
739 unsigned long size = 0;
741 for_each_sg(sgt->sgl, s, count, i) {
742 if (sg_dma_address(s) != expected)
744 expected = sg_dma_address(s) + sg_dma_len(s);
745 size += sg_dma_len(s);
751 rockchip_gem_iommu_map_sg(struct drm_device *drm,
752 struct dma_buf_attachment *attach,
754 struct rockchip_gem_object *rk_obj)
757 return rockchip_gem_iommu_map(rk_obj);
761 rockchip_gem_dma_map_sg(struct drm_device *drm,
762 struct dma_buf_attachment *attach,
764 struct rockchip_gem_object *rk_obj)
766 int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
771 if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
772 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
773 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
778 rk_obj->dma_addr = sg_dma_address(sg->sgl);
783 struct drm_gem_object *
784 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
785 struct dma_buf_attachment *attach,
788 struct rockchip_drm_private *private = drm->dev_private;
789 struct rockchip_gem_object *rk_obj;
792 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
794 return ERR_CAST(rk_obj);
797 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
799 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
802 DRM_ERROR("failed to import sg table: %d\n", ret);
803 goto err_free_rk_obj;
806 return &rk_obj->base;
813 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
815 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
818 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
819 pgprot_writecombine(PAGE_KERNEL));
821 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
824 return rk_obj->kvaddr;
827 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
829 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
836 /* Nothing to do if allocated by DMA mapping API. */