1 #include <linux/pagemap.h>
2 #include <linux/slab.h>
3 
4 #include <subdev/fb.h>
5 
6 #include "nouveau_drm.h"
7 #include "nouveau_ttm.h"
8 
9 struct nouveau_sgdma_be {
10 	/* this has to be the first field so populate/unpopulated in
11 	 * nouve_bo.c works properly, otherwise have to move them here
12 	 */
13 	struct ttm_dma_tt ttm;
14 	struct drm_device *dev;
15 	struct nouveau_mem *node;
16 };
17 
18 static void
19 nouveau_sgdma_destroy(struct ttm_tt *ttm)
20 {
21 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
22 
23 	if (ttm) {
24 		ttm_dma_tt_fini(&nvbe->ttm);
25 		kfree(nvbe);
26 	}
27 }
28 
29 static int
30 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
31 {
32 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
33 	struct nouveau_mem *node = mem->mm_node;
34 
35 	if (ttm->sg) {
36 		node->sg    = ttm->sg;
37 		node->pages = NULL;
38 	} else {
39 		node->sg    = NULL;
40 		node->pages = nvbe->ttm.dma_address;
41 	}
42 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
43 
44 	nouveau_vm_map(&node->vma[0], node);
45 	nvbe->node = node;
46 	return 0;
47 }
48 
49 static int
50 nv04_sgdma_unbind(struct ttm_tt *ttm)
51 {
52 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
53 	nouveau_vm_unmap(&nvbe->node->vma[0]);
54 	return 0;
55 }
56 
57 static struct ttm_backend_func nv04_sgdma_backend = {
58 	.bind			= nv04_sgdma_bind,
59 	.unbind			= nv04_sgdma_unbind,
60 	.destroy		= nouveau_sgdma_destroy
61 };
62 
63 static int
64 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
65 {
66 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
67 	struct nouveau_mem *node = mem->mm_node;
68 
69 	/* noop: bound in move_notify() */
70 	if (ttm->sg) {
71 		node->sg    = ttm->sg;
72 		node->pages = NULL;
73 	} else {
74 		node->sg    = NULL;
75 		node->pages = nvbe->ttm.dma_address;
76 	}
77 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
78 	return 0;
79 }
80 
81 static int
82 nv50_sgdma_unbind(struct ttm_tt *ttm)
83 {
84 	/* noop: unbound in move_notify() */
85 	return 0;
86 }
87 
88 static struct ttm_backend_func nv50_sgdma_backend = {
89 	.bind			= nv50_sgdma_bind,
90 	.unbind			= nv50_sgdma_unbind,
91 	.destroy		= nouveau_sgdma_destroy
92 };
93 
94 struct ttm_tt *
95 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
96 			 unsigned long size, uint32_t page_flags,
97 			 struct page *dummy_read_page)
98 {
99 	struct nouveau_drm *drm = nouveau_bdev(bdev);
100 	struct nouveau_sgdma_be *nvbe;
101 
102 	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
103 	if (!nvbe)
104 		return NULL;
105 
106 	nvbe->dev = drm->dev;
107 	if (nv_device(drm->device)->card_type < NV_50)
108 		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
109 	else
110 		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
111 
112 	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
113 		return NULL;
114 	return &nvbe->ttm.ttm;
115 }
116