| 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 | |