| 1 | /* $NetBSD: ttm_agp_backend.c,v 1.5 2015/10/17 21:05:57 jmcneill 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_agp_backend.c,v 1.5 2015/10/17 21:05:57 jmcneill Exp $" ); |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/kmem.h> |
| 37 | |
| 38 | #include <dev/pci/pcireg.h> |
| 39 | #include <dev/pci/pcivar.h> |
| 40 | #include <dev/pci/agpvar.h> |
| 41 | |
| 42 | #include <ttm/ttm_bo_driver.h> |
| 43 | #include <ttm/ttm_page_alloc.h> |
| 44 | |
| 45 | #if __OS_HAS_AGP |
| 46 | |
| 47 | struct ttm_agp { |
| 48 | struct ttm_dma_tt ttm_dma; |
| 49 | struct agp_softc *agp; |
| 50 | unsigned long agp_pgno; |
| 51 | bool bound; |
| 52 | }; |
| 53 | |
| 54 | static const struct ttm_backend_func ttm_agp_backend_func; |
| 55 | |
| 56 | struct ttm_tt * |
| 57 | ttm_agp_tt_create(struct ttm_bo_device *bdev, struct agp_bridge_data *bridge, |
| 58 | unsigned long size, uint32_t page_flags, struct page *dummy_read_page) |
| 59 | { |
| 60 | struct ttm_agp *ttm_agp; |
| 61 | |
| 62 | ttm_agp = kmem_zalloc(sizeof(*ttm_agp), KM_SLEEP); |
| 63 | ttm_agp->agp = &bridge->abd_sc; |
| 64 | ttm_agp->ttm_dma.ttm.func = &ttm_agp_backend_func; |
| 65 | |
| 66 | if (ttm_dma_tt_init(&ttm_agp->ttm_dma, bdev, size, page_flags, |
| 67 | dummy_read_page) != 0) |
| 68 | goto fail; |
| 69 | |
| 70 | /* Success! */ |
| 71 | return &ttm_agp->ttm_dma.ttm; |
| 72 | |
| 73 | fail: kmem_free(ttm_agp, sizeof(*ttm_agp)); |
| 74 | return NULL; |
| 75 | } |
| 76 | |
| 77 | int |
| 78 | ttm_agp_tt_populate(struct ttm_tt *ttm) |
| 79 | { |
| 80 | |
| 81 | if (ttm->state != tt_unpopulated) |
| 82 | return 0; |
| 83 | |
| 84 | return ttm_bus_dma_populate(container_of(ttm, struct ttm_dma_tt, ttm)); |
| 85 | } |
| 86 | |
| 87 | void |
| 88 | ttm_agp_tt_unpopulate(struct ttm_tt *ttm) |
| 89 | { |
| 90 | |
| 91 | ttm_bus_dma_unpopulate(container_of(ttm, struct ttm_dma_tt, ttm)); |
| 92 | } |
| 93 | |
| 94 | static int |
| 95 | ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) |
| 96 | { |
| 97 | struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, |
| 98 | ttm_dma.ttm); |
| 99 | struct agp_softc *const sc = ttm_agp->agp; |
| 100 | struct drm_mm_node *const node = bo_mem->mm_node; |
| 101 | const unsigned long agp_pgno = node->start; |
| 102 | unsigned i, j; |
| 103 | int ret; |
| 104 | |
| 105 | KASSERT(!ttm_agp->bound); |
| 106 | KASSERT(ttm_agp->ttm_dma.dma_address->dm_nsegs == ttm->num_pages); |
| 107 | for (i = 0; i < ttm->num_pages; i++) { |
| 108 | KASSERT(ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len == |
| 109 | AGP_PAGE_SIZE); |
| 110 | /* XXX errno NetBSD->Linux */ |
| 111 | ret = -AGP_BIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT, |
| 112 | ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len); |
| 113 | if (ret) |
| 114 | goto fail; |
| 115 | } |
| 116 | agp_flush_cache(); |
| 117 | AGP_FLUSH_TLB(sc); |
| 118 | |
| 119 | /* Success! */ |
| 120 | ttm_agp->agp_pgno = agp_pgno; |
| 121 | ttm_agp->bound = true; |
| 122 | return 0; |
| 123 | |
| 124 | fail: KASSERT(ret); |
| 125 | for (j = 0; j < i; j++) |
| 126 | (void)AGP_UNBIND_PAGE(sc, (agp_pgno + j) << AGP_PAGE_SHIFT); |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | static int |
| 131 | ttm_agp_unbind(struct ttm_tt *ttm) |
| 132 | { |
| 133 | struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, |
| 134 | ttm_dma.ttm); |
| 135 | struct agp_softc *const sc = ttm_agp->agp; |
| 136 | const unsigned long agp_pgno = ttm_agp->agp_pgno; |
| 137 | unsigned i; |
| 138 | |
| 139 | /* XXX Can this happen? */ |
| 140 | if (!ttm_agp->bound) |
| 141 | return 0; |
| 142 | |
| 143 | for (i = 0; i < ttm->num_pages; i++) |
| 144 | (void)AGP_UNBIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT); |
| 145 | |
| 146 | ttm_agp->agp_pgno = 0; |
| 147 | ttm_agp->bound = false; |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static void |
| 152 | ttm_agp_destroy(struct ttm_tt *ttm) |
| 153 | { |
| 154 | struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, |
| 155 | ttm_dma.ttm); |
| 156 | |
| 157 | /* XXX Can this happen? */ |
| 158 | if (ttm_agp->bound) |
| 159 | ttm_agp_unbind(ttm); |
| 160 | ttm_tt_fini(ttm); |
| 161 | kmem_free(ttm_agp, sizeof(*ttm_agp)); |
| 162 | } |
| 163 | |
| 164 | static const struct ttm_backend_func ttm_agp_backend_func = { |
| 165 | .bind = &ttm_agp_bind, |
| 166 | .unbind = &ttm_agp_unbind, |
| 167 | .destroy = &ttm_agp_destroy, |
| 168 | }; |
| 169 | |
| 170 | #endif |
| 171 | |