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 mutex_lock(&private->mm_lock);
40 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
41 rk_obj->base.size, PAGE_SIZE,
44 mutex_unlock(&private->mm_lock);
46 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
50 rk_obj->dma_addr = rk_obj->mm.start;
52 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
53 rk_obj->sgt->nents, prot);
54 if (ret < rk_obj->base.size) {
55 DRM_ERROR("failed to map buffer: %zd\n", ret);
64 drm_mm_remove_node(&rk_obj->mm);
69 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
71 struct drm_device *drm = rk_obj->base.dev;
72 struct rockchip_drm_private *private = drm->dev_private;
74 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
76 mutex_lock(&private->mm_lock);
78 drm_mm_remove_node(&rk_obj->mm);
80 mutex_unlock(&private->mm_lock);
85 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
87 struct drm_device *drm = rk_obj->base.dev;
89 struct scatterlist *s;
91 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
92 if (IS_ERR(rk_obj->pages))
93 return PTR_ERR(rk_obj->pages);
95 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
97 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
98 if (IS_ERR(rk_obj->sgt)) {
99 ret = PTR_ERR(rk_obj->sgt);
104 * Fake up the SG table so that dma_sync_sg_for_device() can be used
105 * to flush the pages associated with it.
107 * TODO: Replace this by drm_clflush_sg() once it can be implemented
108 * without relying on symbols that are not exported.
110 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
111 sg_dma_address(s) = sg_phys(s);
113 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
119 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
123 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
125 sg_free_table(rk_obj->sgt);
127 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
130 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
135 ret = rockchip_gem_get_pages(rk_obj);
139 ret = rockchip_gem_iommu_map(rk_obj);
144 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
145 pgprot_writecombine(PAGE_KERNEL));
146 if (!rk_obj->kvaddr) {
147 DRM_ERROR("failed to vmap() buffer\n");
156 rockchip_gem_iommu_unmap(rk_obj);
158 rockchip_gem_put_pages(rk_obj);
163 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
166 struct drm_gem_object *obj = &rk_obj->base;
167 struct drm_device *drm = obj->dev;
169 init_dma_attrs(&rk_obj->dma_attrs);
170 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
173 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
175 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
176 &rk_obj->dma_addr, GFP_KERNEL,
178 if (!rk_obj->kvaddr) {
179 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
186 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
189 struct drm_gem_object *obj = &rk_obj->base;
190 struct drm_device *drm = obj->dev;
191 struct rockchip_drm_private *private = drm->dev_private;
194 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
196 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
199 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
201 vunmap(rk_obj->kvaddr);
202 rockchip_gem_iommu_unmap(rk_obj);
203 rockchip_gem_put_pages(rk_obj);
206 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
208 struct drm_gem_object *obj = &rk_obj->base;
209 struct drm_device *drm = obj->dev;
211 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr,
212 rk_obj->dma_addr, &rk_obj->dma_attrs);
215 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
218 rockchip_gem_free_iommu(rk_obj);
220 rockchip_gem_free_dma(rk_obj);
223 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
224 struct vm_area_struct *vma)
226 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
227 unsigned int i, count = obj->size >> PAGE_SHIFT;
228 unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
229 unsigned long uaddr = vma->vm_start;
230 unsigned long offset = vma->vm_pgoff;
231 unsigned long end = user_count + offset;
239 for (i = offset; i < end; i++) {
240 ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
249 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
250 struct vm_area_struct *vma)
252 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
253 struct drm_device *drm = obj->dev;
255 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
256 obj->size, &rk_obj->dma_attrs);
259 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
260 struct vm_area_struct *vma)
263 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
266 * We allocated a struct page table for rk_obj, so clear
267 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
269 vma->vm_flags &= ~VM_PFNMAP;
272 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
274 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
277 drm_gem_vm_close(vma);
282 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
283 struct vm_area_struct *vma)
287 ret = drm_gem_mmap_obj(obj, obj->size, vma);
291 return rockchip_drm_gem_object_mmap(obj, vma);
294 /* drm driver mmap file operations */
295 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
297 struct drm_gem_object *obj;
300 ret = drm_gem_mmap(filp, vma);
305 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
306 * whole buffer from the start.
310 obj = vma->vm_private_data;
312 return rockchip_drm_gem_object_mmap(obj, vma);
315 static struct rockchip_gem_object *
316 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
318 struct rockchip_gem_object *rk_obj;
319 struct drm_gem_object *obj;
321 size = round_up(size, PAGE_SIZE);
323 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
325 return ERR_PTR(-ENOMEM);
329 drm_gem_object_init(drm, obj, size);
334 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
336 drm_gem_object_release(&rk_obj->base);
340 struct rockchip_gem_object *
341 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
344 struct rockchip_gem_object *rk_obj;
347 rk_obj = rockchip_gem_alloc_object(drm, size);
351 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
353 goto err_free_rk_obj;
358 rockchip_gem_release_object(rk_obj);
363 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
366 void rockchip_gem_free_object(struct drm_gem_object *obj)
368 struct drm_device *drm = obj->dev;
369 struct rockchip_drm_private *private = drm->dev_private;
370 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
372 if (obj->import_attach) {
373 if (private->domain) {
374 rockchip_gem_iommu_unmap(rk_obj);
376 dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
377 rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
379 drm_prime_gem_destroy(obj, rk_obj->sgt);
381 rockchip_gem_free_buf(rk_obj);
384 #ifdef CONFIG_DRM_DMA_SYNC
385 drm_fence_signal_and_put(&rk_obj->acquire_fence);
388 rockchip_gem_release_object(rk_obj);
392 * rockchip_gem_create_with_handle - allocate an object with the given
393 * size and create a gem handle on it
395 * returns a struct rockchip_gem_object* on success or ERR_PTR values
398 static struct rockchip_gem_object *
399 rockchip_gem_create_with_handle(struct drm_file *file_priv,
400 struct drm_device *drm, unsigned int size,
401 unsigned int *handle)
403 struct rockchip_gem_object *rk_obj;
404 struct drm_gem_object *obj;
407 rk_obj = rockchip_gem_create_object(drm, size, false);
409 return ERR_CAST(rk_obj);
414 * allocate a id of idr table where the obj is registered
415 * and handle has the id what user can see.
417 ret = drm_gem_handle_create(file_priv, obj, handle);
419 goto err_handle_create;
421 /* drop reference from allocate - handle holds it now. */
422 drm_gem_object_unreference_unlocked(obj);
427 rockchip_gem_free_object(obj);
432 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
433 struct drm_device *dev, uint32_t handle,
436 struct drm_gem_object *obj;
439 obj = drm_gem_object_lookup(dev, file_priv, handle);
441 DRM_ERROR("failed to lookup gem object.\n");
445 ret = drm_gem_create_mmap_offset(obj);
449 *offset = drm_vma_node_offset_addr(&obj->vma_node);
450 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
453 drm_gem_object_unreference_unlocked(obj);
459 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
462 * This aligns the pitch and size arguments to the minimum required. wrap
463 * this into your own function if you need bigger alignment.
465 int rockchip_gem_dumb_create(struct drm_file *file_priv,
466 struct drm_device *dev,
467 struct drm_mode_create_dumb *args)
469 struct rockchip_gem_object *rk_obj;
470 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
473 * align to 64 bytes since Mali requires it.
475 args->pitch = ALIGN(min_pitch, 64);
476 args->size = args->pitch * args->height;
478 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
481 return PTR_ERR_OR_ZERO(rk_obj);
484 int rockchip_gem_map_offset_ioctl(struct drm_device *drm, void *data,
485 struct drm_file *file_priv)
487 struct drm_rockchip_gem_map_off *args = data;
489 return rockchip_gem_dumb_map_offset(file_priv, drm, args->handle,
493 int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
494 struct drm_file *file_priv)
496 struct drm_rockchip_gem_create *args = data;
497 struct rockchip_gem_object *rk_obj;
499 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
501 return PTR_ERR_OR_ZERO(rk_obj);
504 static struct reservation_object *drm_gem_get_resv(struct drm_gem_object *gem)
506 struct dma_buf *dma_buf = gem->dma_buf;
507 return dma_buf ? dma_buf->resv : NULL;
510 #ifdef CONFIG_DRM_DMA_SYNC
511 static void rockchip_gem_acquire_complete(struct drm_reservation_cb *rcb,
514 struct completion *compl = context;
518 static int rockchip_gem_acquire(struct drm_device *dev,
519 struct rockchip_gem_object *rockchip_gem_obj,
523 struct rockchip_drm_private *dev_priv = dev->dev_private;
524 struct reservation_object *resv =
525 drm_gem_get_resv(&rockchip_gem_obj->base);
527 struct drm_reservation_cb rcb;
528 DECLARE_COMPLETION_ONSTACK(compl);
534 !rockchip_gem_obj->acquire_exclusive &&
535 rockchip_gem_obj->acquire_fence) {
536 atomic_inc(&rockchip_gem_obj->acquire_shared_count);
540 fence = drm_sw_fence_new(dev_priv->cpu_fence_context,
541 atomic_add_return(1, &dev_priv->cpu_fence_seqno));
543 ret = PTR_ERR(fence);
544 DRM_ERROR("Failed to create acquire fence %d.\n", ret);
547 ww_mutex_lock(&resv->lock, NULL);
549 ret = reservation_object_reserve_shared(resv);
551 DRM_ERROR("Failed to reserve space for shared fence %d.\n",
556 drm_reservation_cb_init(&rcb, rockchip_gem_acquire_complete, &compl);
557 ret = drm_reservation_cb_add(&rcb, resv, exclusive);
559 DRM_ERROR("Failed to add reservation to callback %d.\n", ret);
562 drm_reservation_cb_done(&rcb);
564 reservation_object_add_excl_fence(resv, fence);
566 reservation_object_add_shared_fence(resv, fence);
568 ww_mutex_unlock(&resv->lock);
569 mutex_unlock(&dev->struct_mutex);
570 ret = wait_for_completion_interruptible(&compl);
571 mutex_lock(&dev->struct_mutex);
573 DRM_ERROR("Failed wait for reservation callback %d.\n", ret);
574 drm_reservation_cb_fini(&rcb);
575 /* somebody else may be already waiting on it */
576 drm_fence_signal_and_put(&fence);
579 rockchip_gem_obj->acquire_fence = fence;
580 rockchip_gem_obj->acquire_exclusive = exclusive;
581 atomic_set(&rockchip_gem_obj->acquire_shared_count, 1);
585 ww_mutex_unlock(&resv->lock);
590 static void rockchip_gem_release(struct rockchip_gem_object *rockchip_gem_obj)
592 BUG_ON(!rockchip_gem_obj->acquire_fence);
593 if (atomic_sub_and_test(1,
594 &rockchip_gem_obj->acquire_shared_count))
595 drm_fence_signal_and_put(&rockchip_gem_obj->acquire_fence);
599 int rockchip_gem_cpu_acquire_ioctl(struct drm_device *dev, void *data,
600 struct drm_file *file)
602 struct drm_rockchip_gem_cpu_acquire *args = data;
603 struct rockchip_drm_file_private *file_priv = file->driver_priv;
604 struct drm_gem_object *obj;
605 struct rockchip_gem_object *rockchip_gem_obj;
606 struct rockchip_gem_object_node *gem_node;
609 DRM_DEBUG_KMS("[BO:%u] flags: 0x%x\n", args->handle, args->flags);
611 mutex_lock(&dev->struct_mutex);
613 obj = drm_gem_object_lookup(dev, file, args->handle);
615 DRM_ERROR("failed to lookup gem object.\n");
620 rockchip_gem_obj = to_rockchip_obj(obj);
622 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
623 /* If there is no reservation object present, there is no
624 * cross-process/cross-device sharing and sync is unnecessary.
630 #ifdef CONFIG_DRM_DMA_SYNC
631 ret = rockchip_gem_acquire(dev, rockchip_gem_obj,
632 args->flags & DRM_ROCKCHIP_GEM_CPU_ACQUIRE_EXCLUSIVE);
637 gem_node = kzalloc(sizeof(*gem_node), GFP_KERNEL);
639 DRM_ERROR("Failed to allocate rockchip_drm_gem_obj_node.\n");
644 gem_node->rockchip_gem_obj = rockchip_gem_obj;
645 list_add(&gem_node->list, &file_priv->gem_cpu_acquire_list);
646 mutex_unlock(&dev->struct_mutex);
650 #ifdef CONFIG_DRM_DMA_SYNC
651 rockchip_gem_release(rockchip_gem_obj);
654 drm_gem_object_unreference(obj);
657 mutex_unlock(&dev->struct_mutex);
661 int rockchip_gem_cpu_release_ioctl(struct drm_device *dev, void *data,
662 struct drm_file *file)
664 struct drm_rockchip_gem_cpu_release *args = data;
665 struct rockchip_drm_file_private *file_priv = file->driver_priv;
666 struct drm_gem_object *obj;
667 struct rockchip_gem_object *rockchip_gem_obj;
668 struct list_head *cur;
671 DRM_DEBUG_KMS("[BO:%u]\n", args->handle);
673 mutex_lock(&dev->struct_mutex);
675 obj = drm_gem_object_lookup(dev, file, args->handle);
677 DRM_ERROR("failed to lookup gem object.\n");
682 rockchip_gem_obj = to_rockchip_obj(obj);
684 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
685 /* If there is no reservation object present, there is no
686 * cross-process/cross-device sharing and sync is unnecessary.
692 list_for_each(cur, &file_priv->gem_cpu_acquire_list) {
693 struct rockchip_gem_object_node *node = list_entry(
694 cur, struct rockchip_gem_object_node, list);
695 if (node->rockchip_gem_obj == rockchip_gem_obj)
698 if (cur == &file_priv->gem_cpu_acquire_list) {
699 DRM_ERROR("gem object not acquired for current process.\n");
704 #ifdef CONFIG_DRM_DMA_SYNC
705 rockchip_gem_release(rockchip_gem_obj);
709 kfree(list_entry(cur, struct rockchip_gem_object_node, list));
710 /* unreference for the reference held since cpu_acquire_ioctl */
711 drm_gem_object_unreference(obj);
715 /* unreference for the reference from drm_gem_object_lookup() */
716 drm_gem_object_unreference(obj);
719 mutex_unlock(&dev->struct_mutex);
724 * Allocate a sg_table for this GEM object.
725 * Note: Both the table's contents, and the sg_table itself must be freed by
727 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
729 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
731 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
732 struct drm_device *drm = obj->dev;
733 struct sg_table *sgt;
737 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
739 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
741 return ERR_PTR(-ENOMEM);
743 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
744 rk_obj->dma_addr, obj->size,
747 DRM_ERROR("failed to allocate sgt, %d\n", ret);
755 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
758 struct scatterlist *s;
759 dma_addr_t expected = sg_dma_address(sgt->sgl);
761 unsigned long size = 0;
763 for_each_sg(sgt->sgl, s, count, i) {
764 if (sg_dma_address(s) != expected)
766 expected = sg_dma_address(s) + sg_dma_len(s);
767 size += sg_dma_len(s);
773 rockchip_gem_iommu_map_sg(struct drm_device *drm,
774 struct dma_buf_attachment *attach,
776 struct rockchip_gem_object *rk_obj)
779 return rockchip_gem_iommu_map(rk_obj);
783 rockchip_gem_dma_map_sg(struct drm_device *drm,
784 struct dma_buf_attachment *attach,
786 struct rockchip_gem_object *rk_obj)
788 int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
793 if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
794 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
795 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
800 rk_obj->dma_addr = sg_dma_address(sg->sgl);
805 struct drm_gem_object *
806 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
807 struct dma_buf_attachment *attach,
810 struct rockchip_drm_private *private = drm->dev_private;
811 struct rockchip_gem_object *rk_obj;
814 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
816 return ERR_CAST(rk_obj);
819 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
821 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
824 DRM_ERROR("failed to import sg table: %d\n", ret);
825 goto err_free_rk_obj;
828 return &rk_obj->base;
831 rockchip_gem_release_object(rk_obj);
835 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
837 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
840 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
841 pgprot_writecombine(PAGE_KERNEL));
843 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
846 return rk_obj->kvaddr;
849 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
851 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
858 /* Nothing to do if allocated by DMA mapping API. */