1 | /* $NetBSD: ttm_bus_dma.c,v 1.2 2016/04/24 04:26:12 riastradh Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2014 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Taylor R. Campbell. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: ttm_bus_dma.c,v 1.2 2016/04/24 04:26:12 riastradh Exp $" ); |
34 | |
35 | #include <sys/bus.h> |
36 | |
37 | #include <uvm/uvm_extern.h> |
38 | |
39 | #include <drm/bus_dma_hacks.h> |
40 | #include <ttm/ttm_bo_driver.h> |
41 | #include <ttm/ttm_page_alloc.h> |
42 | |
43 | /* |
44 | * ttm_bus_dma_populate(ttm_dma) |
45 | * |
46 | * If ttm_dma is not already populated, wire its pages and load |
47 | * its DMA map. The wiring and loading are stable as long as the |
48 | * associated bo is reserved. |
49 | * |
50 | * Transitions from tt_unpopulated or tt_unbound to tt_unbound. |
51 | * Marks as wired, a.k.a. !swapped. |
52 | */ |
53 | int |
54 | ttm_bus_dma_populate(struct ttm_dma_tt *ttm_dma) |
55 | { |
56 | int ret; |
57 | |
58 | KASSERT(ttm_dma->ttm.state != tt_bound); |
59 | |
60 | /* Check the current state. */ |
61 | if (ttm_dma->ttm.state == tt_unbound) { |
62 | /* |
63 | * If it's populated, then if the pages are wired and |
64 | * loaded already, nothing to do. |
65 | */ |
66 | if (!ISSET(ttm_dma->ttm.page_flags, TTM_PAGE_FLAG_SWAPPED)) |
67 | return 0; |
68 | } else if (ttm_dma->ttm.state == tt_unpopulated) { |
69 | /* If it's unpopulated, it can't be swapped. */ |
70 | KASSERT(!ISSET(ttm_dma->ttm.page_flags, |
71 | TTM_PAGE_FLAG_SWAPPED)); |
72 | /* Pretend it is now, for the sake of ttm_tt_wire. */ |
73 | ttm_dma->ttm.page_flags |= TTM_PAGE_FLAG_SWAPPED; |
74 | } |
75 | |
76 | /* Wire the uvm pages and fill the ttm page array. */ |
77 | ret = ttm_tt_wire(&ttm_dma->ttm); |
78 | if (ret) |
79 | goto fail0; |
80 | |
81 | /* Load the DMA map. */ |
82 | /* XXX errno NetBSD->Linux */ |
83 | ret = -bus_dmamap_load_pglist(ttm_dma->ttm.bdev->dmat, |
84 | ttm_dma->dma_address, &ttm_dma->ttm.pglist, |
85 | (ttm_dma->ttm.num_pages << PAGE_SHIFT), BUS_DMA_NOWAIT); |
86 | if (ret) |
87 | goto fail1; |
88 | |
89 | /* Mark it wired. */ |
90 | ttm_dma->ttm.page_flags &= ~TTM_PAGE_FLAG_SWAPPED; |
91 | |
92 | /* Mark it populated but unbound. */ |
93 | ttm_dma->ttm.state = tt_unbound; |
94 | |
95 | /* Success! */ |
96 | return 0; |
97 | |
98 | fail2: __unused |
99 | bus_dmamap_unload(ttm_dma->ttm.bdev->dmat, ttm_dma->dma_address); |
100 | fail1: ttm_tt_unwire(&ttm_dma->ttm); |
101 | fail0: KASSERT(ret); |
102 | return ret; |
103 | } |
104 | |
105 | static void |
106 | ttm_bus_dma_put(struct ttm_dma_tt *ttm_dma, int flags) |
107 | { |
108 | struct uvm_object *const uobj = ttm_dma->ttm.swap_storage; |
109 | const size_t size = (ttm_dma->ttm.num_pages << PAGE_SHIFT); |
110 | |
111 | /* |
112 | * Can't be tt_bound -- still in use and needs to be removed |
113 | * from GPU page tables. Can't be tt_unpopulated -- if it |
114 | * were, why are you hnadling this? Hence tt_unbound. |
115 | */ |
116 | KASSERTMSG((ttm_dma->ttm.state == tt_unbound), |
117 | "ttm_tt %p in invalid state for unpopulate/swapout: %d" , |
118 | &ttm_dma->ttm, (int)ttm_dma->ttm.state); |
119 | |
120 | /* If pages are wired and loaded, unload and unwire them. */ |
121 | if (!ISSET(ttm_dma->ttm.page_flags, TTM_PAGE_FLAG_SWAPPED)) { |
122 | bus_dmamap_unload(ttm_dma->ttm.bdev->dmat, |
123 | ttm_dma->dma_address); |
124 | ttm_tt_unwire(&ttm_dma->ttm); |
125 | ttm_dma->ttm.page_flags |= TTM_PAGE_FLAG_SWAPPED; |
126 | } |
127 | |
128 | /* We are using uvm_aobj, which had better have a pgo_put. */ |
129 | KASSERT(uobj->pgops->pgo_put); |
130 | |
131 | /* Release or deactivate the pages. */ |
132 | mutex_enter(uobj->vmobjlock); |
133 | (void)(*uobj->pgops->pgo_put)(uobj, 0, size, flags); |
134 | /* pgo_put unlocks uobj->vmobjlock. */ |
135 | |
136 | /* Mark it unpopulated. */ |
137 | ttm_dma->ttm.state = tt_unpopulated; |
138 | } |
139 | |
140 | /* |
141 | * ttmm_bus_dma_unpopulate(ttm_dma) |
142 | * |
143 | * Unload any DMA map, unwire any pages, and release any pages |
144 | * associated with ttm_dma. |
145 | * |
146 | * Transitions from tt_unbound to tt_unpopulated. Marks as |
147 | * unwired, a.k.a. swapped. |
148 | */ |
149 | void |
150 | ttm_bus_dma_unpopulate(struct ttm_dma_tt *ttm_dma) |
151 | { |
152 | |
153 | ttm_bus_dma_put(ttm_dma, PGO_CLEANIT|PGO_FREE); |
154 | } |
155 | |
156 | /* |
157 | * ttm_bus_dma_swapout(ttm_dma) |
158 | * |
159 | * Unload any DMA map, unwire any pages, and deactivate any pages |
160 | * associated with ttm_dma so that they can be swapped out, but |
161 | * don't release them. |
162 | * |
163 | * Transitions from tt_unbound to tt_unpopulated. Marks as |
164 | * unwired, a.k.a. swapped. |
165 | */ |
166 | void |
167 | ttm_bus_dma_swapout(struct ttm_dma_tt *ttm_dma) |
168 | { |
169 | |
170 | ttm_bus_dma_put(ttm_dma, PGO_DEACTIVATE); |
171 | } |
172 | |