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      1 /*	$NetBSD: radeon_prime.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * based on nouveau_prime.c
     25  *
     26  * Authors: Alex Deucher
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: radeon_prime.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $");
     31 
     32 #include <linux/dma-buf.h>
     33 
     34 #include <drm/drm_prime.h>
     35 #include <drm/radeon_drm.h>
     36 
     37 #include "radeon.h"
     38 
     39 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
     40 {
     41 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     42 	int npages = bo->tbo.num_pages;
     43 
     44 	return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
     45 }
     46 
     47 void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
     48 {
     49 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     50 	int ret;
     51 
     52 	ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
     53 			  &bo->dma_buf_vmap);
     54 	if (ret)
     55 		return ERR_PTR(ret);
     56 
     57 	return bo->dma_buf_vmap.virtual;
     58 }
     59 
     60 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
     61 {
     62 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     63 
     64 	ttm_bo_kunmap(&bo->dma_buf_vmap);
     65 }
     66 
     67 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
     68 							struct dma_buf_attachment *attach,
     69 							struct sg_table *sg)
     70 {
     71 	struct dma_resv *resv = attach->dmabuf->resv;
     72 	struct radeon_device *rdev = dev->dev_private;
     73 	struct radeon_bo *bo;
     74 	int ret;
     75 
     76 	dma_resv_lock(resv, NULL);
     77 	ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
     78 			       RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
     79 	dma_resv_unlock(resv);
     80 	if (ret)
     81 		return ERR_PTR(ret);
     82 
     83 	mutex_lock(&rdev->gem.mutex);
     84 	list_add_tail(&bo->list, &rdev->gem.objects);
     85 	mutex_unlock(&rdev->gem.mutex);
     86 
     87 	bo->prime_shared_count = 1;
     88 	return &bo->tbo.base;
     89 }
     90 
     91 int radeon_gem_prime_pin(struct drm_gem_object *obj)
     92 {
     93 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     94 	int ret = 0;
     95 
     96 	ret = radeon_bo_reserve(bo, false);
     97 	if (unlikely(ret != 0))
     98 		return ret;
     99 
    100 	/* pin buffer into GTT */
    101 	ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
    102 	if (likely(ret == 0))
    103 		bo->prime_shared_count++;
    104 
    105 	radeon_bo_unreserve(bo);
    106 	return ret;
    107 }
    108 
    109 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
    110 {
    111 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
    112 	int ret = 0;
    113 
    114 	ret = radeon_bo_reserve(bo, false);
    115 	if (unlikely(ret != 0))
    116 		return;
    117 
    118 	radeon_bo_unpin(bo);
    119 	if (bo->prime_shared_count)
    120 		bo->prime_shared_count--;
    121 	radeon_bo_unreserve(bo);
    122 }
    123 
    124 
    125 struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
    126 					int flags)
    127 {
    128 	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
    129 	if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
    130 		return ERR_PTR(-EPERM);
    131 	return drm_gem_prime_export(gobj, flags);
    132 }
    133