1 /* $NetBSD: nouveau_sgdma.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $ */
2
3 // SPDX-License-Identifier: MIT
4 #include <sys/cdefs.h>
5 __KERNEL_RCSID(0, "$NetBSD: nouveau_sgdma.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $");
6
7 #include <linux/pagemap.h>
8 #include <linux/slab.h>
9
10 #include "nouveau_drv.h"
11 #include "nouveau_mem.h"
12 #include "nouveau_ttm.h"
13
14 struct nouveau_sgdma_be {
15 /* this has to be the first field so populate/unpopulated in
16 * nouve_bo.c works properly, otherwise have to move them here
17 */
18 struct ttm_dma_tt ttm;
19 struct nouveau_mem *mem;
20 };
21
22 static void
nouveau_sgdma_destroy(struct ttm_tt * ttm)23 nouveau_sgdma_destroy(struct ttm_tt *ttm)
24 {
25 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
26
27 if (ttm) {
28 ttm_dma_tt_fini(&nvbe->ttm);
29 kfree(nvbe);
30 }
31 }
32
33 static int
nv04_sgdma_bind(struct ttm_tt * ttm,struct ttm_mem_reg * reg)34 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
35 {
36 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
37 struct nouveau_mem *mem = nouveau_mem(reg);
38 int ret;
39
40 ret = nouveau_mem_host(reg, &nvbe->ttm);
41 if (ret)
42 return ret;
43
44 ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
45 if (ret) {
46 nouveau_mem_fini(mem);
47 return ret;
48 }
49
50 nvbe->mem = mem;
51 return 0;
52 }
53
54 static int
nv04_sgdma_unbind(struct ttm_tt * ttm)55 nv04_sgdma_unbind(struct ttm_tt *ttm)
56 {
57 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
58 nouveau_mem_fini(nvbe->mem);
59 return 0;
60 }
61
62 static struct ttm_backend_func nv04_sgdma_backend = {
63 .bind = nv04_sgdma_bind,
64 .unbind = nv04_sgdma_unbind,
65 .destroy = nouveau_sgdma_destroy
66 };
67
68 static int
nv50_sgdma_bind(struct ttm_tt * ttm,struct ttm_mem_reg * reg)69 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
70 {
71 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
72 struct nouveau_mem *mem = nouveau_mem(reg);
73 int ret;
74
75 ret = nouveau_mem_host(reg, &nvbe->ttm);
76 if (ret)
77 return ret;
78
79 nvbe->mem = mem;
80 return 0;
81 }
82
83 static struct ttm_backend_func nv50_sgdma_backend = {
84 .bind = nv50_sgdma_bind,
85 .unbind = nv04_sgdma_unbind,
86 .destroy = nouveau_sgdma_destroy
87 };
88
89 struct ttm_tt *
nouveau_sgdma_create_ttm(struct ttm_buffer_object * bo,uint32_t page_flags)90 nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
91 {
92 struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
93 struct nouveau_sgdma_be *nvbe;
94
95 nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
96 if (!nvbe)
97 return NULL;
98
99 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
100 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
101 else
102 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
103
104 if (ttm_dma_tt_init(&nvbe->ttm, bo, page_flags))
105 /*
106 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
107 * and thus our nouveau_sgdma_destroy() hook, so we don't need
108 * to free nvbe here.
109 */
110 return NULL;
111 return &nvbe->ttm.ttm;
112 }
113