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floppy: Run floppy initialization asynchronous
[karo-tx-linux.git] / drivers / gpu / drm / nouveau / nouveau_prime.c
1
2 #include "drmP.h"
3 #include "drm.h"
4
5 #include "nouveau_drv.h"
6 #include "nouveau_drm.h"
7 #include "nouveau_dma.h"
8
9 #include <linux/dma-buf.h>
10
11 static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
12                                           enum dma_data_direction dir)
13 {
14         struct nouveau_bo *nvbo = attachment->dmabuf->priv;
15         struct drm_device *dev = nvbo->gem->dev;
16         int npages = nvbo->bo.num_pages;
17         struct sg_table *sg;
18         int nents;
19
20         mutex_lock(&dev->struct_mutex);
21         sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
22         nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
23         mutex_unlock(&dev->struct_mutex);
24         return sg;
25 }
26
27 static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
28                                       struct sg_table *sg, enum dma_data_direction dir)
29 {
30         dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
31         sg_free_table(sg);
32         kfree(sg);
33 }
34
35 static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
36 {
37         struct nouveau_bo *nvbo = dma_buf->priv;
38
39         if (nvbo->gem->export_dma_buf == dma_buf) {
40                 nvbo->gem->export_dma_buf = NULL;
41                 drm_gem_object_unreference_unlocked(nvbo->gem);
42         }
43 }
44
45 static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
46 {
47         return NULL;
48 }
49
50 static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
51 {
52
53 }
54 static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
55 {
56         return NULL;
57 }
58
59 static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
60 {
61
62 }
63
64 static const struct dma_buf_ops nouveau_dmabuf_ops =  {
65         .map_dma_buf = nouveau_gem_map_dma_buf,
66         .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
67         .release = nouveau_gem_dmabuf_release,
68         .kmap = nouveau_gem_kmap,
69         .kmap_atomic = nouveau_gem_kmap_atomic,
70         .kunmap = nouveau_gem_kunmap,
71         .kunmap_atomic = nouveau_gem_kunmap_atomic,
72 };
73
74 static int
75 nouveau_prime_new(struct drm_device *dev,
76                   size_t size,
77                   struct sg_table *sg,
78                   struct nouveau_bo **pnvbo)
79 {
80         struct nouveau_bo *nvbo;
81         u32 flags = 0;
82         int ret;
83
84         flags = TTM_PL_FLAG_TT;
85
86         ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
87                              sg, pnvbo);
88         if (ret)
89                 return ret;
90         nvbo = *pnvbo;
91
92         /* we restrict allowed domains on nv50+ to only the types
93          * that were requested at creation time.  not possibly on
94          * earlier chips without busting the ABI.
95          */
96         nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
97         nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
98         if (!nvbo->gem) {
99                 nouveau_bo_ref(NULL, pnvbo);
100                 return -ENOMEM;
101         }
102
103         nvbo->gem->driver_private = nvbo;
104         return 0;
105 }
106
107 struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
108                                 struct drm_gem_object *obj, int flags)
109 {
110         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
111         int ret = 0;
112
113         /* pin buffer into GTT */
114         ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
115         if (ret)
116                 return ERR_PTR(-EINVAL);
117
118         return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
119 }
120
121 struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
122                                 struct dma_buf *dma_buf)
123 {
124         struct dma_buf_attachment *attach;
125         struct sg_table *sg;
126         struct nouveau_bo *nvbo;
127         int ret;
128
129         if (dma_buf->ops == &nouveau_dmabuf_ops) {
130                 nvbo = dma_buf->priv;
131                 if (nvbo->gem) {
132                         if (nvbo->gem->dev == dev) {
133                                 drm_gem_object_reference(nvbo->gem);
134                                 return nvbo->gem;
135                         }
136                 }
137         }
138         /* need to attach */
139         attach = dma_buf_attach(dma_buf, dev->dev);
140         if (IS_ERR(attach))
141                 return ERR_PTR(PTR_ERR(attach));
142
143         sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
144         if (IS_ERR(sg)) {
145                 ret = PTR_ERR(sg);
146                 goto fail_detach;
147         }
148
149         ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
150         if (ret)
151                 goto fail_unmap;
152
153         nvbo->gem->import_attach = attach;
154
155         return nvbo->gem;
156
157 fail_unmap:
158         dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
159 fail_detach:
160         dma_buf_detach(dma_buf, attach);
161         return ERR_PTR(ret);
162 }
163