tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/* Copyright 2018-2019 Qiang Yu <yuq825@gmail.com> */
3
4#include <drm/drm_prime.h>
5#include <linux/pagemap.h>
6#include <linux/dma-mapping.h>
7
8#include "lima_object.h"
9
10void lima_bo_destroy(struct lima_bo *bo)
11{
12 if (bo->sgt) {
13 kfree(bo->pages);
14 drm_prime_gem_destroy(&bo->gem, bo->sgt);
15 } else {
16 if (bo->pages_dma_addr) {
17 int i, npages = bo->gem.size >> PAGE_SHIFT;
18
19 for (i = 0; i < npages; i++) {
20 if (bo->pages_dma_addr[i])
21 dma_unmap_page(bo->gem.dev->dev,
22 bo->pages_dma_addr[i],
23 PAGE_SIZE, DMA_BIDIRECTIONAL);
24 }
25 }
26
27 if (bo->pages)
28 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
29 }
30
31 kfree(bo->pages_dma_addr);
32 drm_gem_object_release(&bo->gem);
33 kfree(bo);
34}
35
36static struct lima_bo *lima_bo_create_struct(struct lima_device *dev, u32 size, u32 flags)
37{
38 struct lima_bo *bo;
39 int err;
40
41 size = PAGE_ALIGN(size);
42
43 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
44 if (!bo)
45 return ERR_PTR(-ENOMEM);
46
47 mutex_init(&bo->lock);
48 INIT_LIST_HEAD(&bo->va);
49
50 err = drm_gem_object_init(dev->ddev, &bo->gem, size);
51 if (err) {
52 kfree(bo);
53 return ERR_PTR(err);
54 }
55
56 return bo;
57}
58
59struct lima_bo *lima_bo_create(struct lima_device *dev, u32 size,
60 u32 flags, struct sg_table *sgt)
61{
62 int i, err;
63 size_t npages;
64 struct lima_bo *bo, *ret;
65
66 bo = lima_bo_create_struct(dev, size, flags);
67 if (IS_ERR(bo))
68 return bo;
69
70 npages = bo->gem.size >> PAGE_SHIFT;
71
72 bo->pages_dma_addr = kcalloc(npages, sizeof(dma_addr_t), GFP_KERNEL);
73 if (!bo->pages_dma_addr) {
74 ret = ERR_PTR(-ENOMEM);
75 goto err_out;
76 }
77
78 if (sgt) {
79 bo->sgt = sgt;
80
81 bo->pages = kcalloc(npages, sizeof(*bo->pages), GFP_KERNEL);
82 if (!bo->pages) {
83 ret = ERR_PTR(-ENOMEM);
84 goto err_out;
85 }
86
87 err = drm_prime_sg_to_page_addr_arrays(
88 sgt, bo->pages, bo->pages_dma_addr, npages);
89 if (err) {
90 ret = ERR_PTR(err);
91 goto err_out;
92 }
93 } else {
94 mapping_set_gfp_mask(bo->gem.filp->f_mapping, GFP_DMA32);
95 bo->pages = drm_gem_get_pages(&bo->gem);
96 if (IS_ERR(bo->pages)) {
97 ret = ERR_CAST(bo->pages);
98 bo->pages = NULL;
99 goto err_out;
100 }
101
102 for (i = 0; i < npages; i++) {
103 dma_addr_t addr = dma_map_page(dev->dev, bo->pages[i], 0,
104 PAGE_SIZE, DMA_BIDIRECTIONAL);
105 if (dma_mapping_error(dev->dev, addr)) {
106 ret = ERR_PTR(-EFAULT);
107 goto err_out;
108 }
109 bo->pages_dma_addr[i] = addr;
110 }
111
112 }
113
114 return bo;
115
116err_out:
117 lima_bo_destroy(bo);
118 return ret;
119}