1 /* $NetBSD: ttm_agp_backend.c,v 1.3 2014/08/14 16:50:22 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_agp_backend.c,v 1.3 2014/08/14 16:50:22 riastradh 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 struct ttm_agp { 46 struct ttm_dma_tt ttm_dma; 47 struct agp_softc *agp; 48 unsigned long agp_pgno; 49 bool bound; 50 }; 51 52 static const struct ttm_backend_func ttm_agp_backend_func; 53 54 struct ttm_tt * 55 ttm_agp_tt_create(struct ttm_bo_device *bdev, struct agp_bridge_data *bridge, 56 unsigned long size, uint32_t page_flags, struct page *dummy_read_page) 57 { 58 struct ttm_agp *ttm_agp; 59 60 ttm_agp = kmem_zalloc(sizeof(*ttm_agp), KM_SLEEP); 61 ttm_agp->agp = &bridge->abd_sc; 62 ttm_agp->ttm_dma.ttm.func = &ttm_agp_backend_func; 63 64 if (ttm_dma_tt_init(&ttm_agp->ttm_dma, bdev, size, page_flags, 65 dummy_read_page) != 0) 66 goto fail; 67 68 /* Success! */ 69 return &ttm_agp->ttm_dma.ttm; 70 71 fail: kmem_free(ttm_agp, sizeof(*ttm_agp)); 72 return NULL; 73 } 74 75 int 76 ttm_agp_tt_populate(struct ttm_tt *ttm) 77 { 78 79 if (ttm->state != tt_unpopulated) 80 return 0; 81 82 return ttm_bus_dma_populate(container_of(ttm, struct ttm_dma_tt, ttm)); 83 } 84 85 void 86 ttm_agp_tt_unpopulate(struct ttm_tt *ttm) 87 { 88 89 ttm_bus_dma_unpopulate(container_of(ttm, struct ttm_dma_tt, ttm)); 90 } 91 92 static int 93 ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 94 { 95 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 96 ttm_dma.ttm); 97 struct agp_softc *const sc = ttm_agp->agp; 98 struct drm_mm_node *const node = bo_mem->mm_node; 99 const unsigned long agp_pgno = node->start; 100 unsigned i, j; 101 int ret; 102 103 KASSERT(!ttm_agp->bound); 104 KASSERT(ttm_agp->ttm_dma.dma_address->dm_nsegs == ttm->num_pages); 105 for (i = 0; i < ttm->num_pages; i++) { 106 KASSERT(ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len == 107 AGP_PAGE_SIZE); 108 /* XXX errno NetBSD->Linux */ 109 ret = -AGP_BIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT, 110 ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len); 111 if (ret) 112 goto fail; 113 } 114 agp_flush_cache(); 115 AGP_FLUSH_TLB(sc); 116 117 /* Success! */ 118 ttm_agp->agp_pgno = agp_pgno; 119 ttm_agp->bound = true; 120 return 0; 121 122 fail: KASSERT(ret); 123 for (j = 0; j < i; j++) 124 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + j) << AGP_PAGE_SHIFT); 125 return ret; 126 } 127 128 static int 129 ttm_agp_unbind(struct ttm_tt *ttm) 130 { 131 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 132 ttm_dma.ttm); 133 struct agp_softc *const sc = ttm_agp->agp; 134 const unsigned long agp_pgno = ttm_agp->agp_pgno; 135 unsigned i; 136 137 /* XXX Can this happen? */ 138 if (!ttm_agp->bound) 139 return 0; 140 141 for (i = 0; i < ttm->num_pages; i++) 142 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT); 143 144 ttm_agp->agp_pgno = 0; 145 ttm_agp->bound = false; 146 return 0; 147 } 148 149 static void 150 ttm_agp_destroy(struct ttm_tt *ttm) 151 { 152 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 153 ttm_dma.ttm); 154 155 /* XXX Can this happen? */ 156 if (ttm_agp->bound) 157 ttm_agp_unbind(ttm); 158 ttm_tt_fini(ttm); 159 kmem_free(ttm, sizeof(*ttm)); 160 } 161 162 static const struct ttm_backend_func ttm_agp_backend_func = { 163 .bind = &ttm_agp_bind, 164 .unbind = &ttm_agp_unbind, 165 .destroy = &ttm_agp_destroy, 166 }; 167