1 /* $NetBSD: ttm_agp_backend.c,v 1.9 2021/12/19 01:50:54 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 1.9 2021/12/19 01:50:54 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 <drm/drm_agpsupport.h> 43 44 #include <ttm/ttm_bo_driver.h> 45 #include <ttm/ttm_page_alloc.h> 46 #include <ttm/ttm_tt.h> 47 48 struct ttm_agp { 49 struct ttm_dma_tt ttm_dma; 50 struct agp_softc *agp; 51 unsigned long agp_pgno; 52 bool bound; 53 }; 54 55 static const struct ttm_backend_func ttm_agp_backend_func; 56 57 struct ttm_tt * 58 ttm_agp_tt_create(struct ttm_buffer_object *bo, struct agp_bridge_data *bridge, 59 uint32_t page_flags) 60 { 61 struct ttm_agp *ttm_agp; 62 63 ttm_agp = kmem_zalloc(sizeof(*ttm_agp), KM_SLEEP); 64 ttm_agp->agp = &bridge->abd_sc; 65 ttm_agp->ttm_dma.ttm.func = &ttm_agp_backend_func; 66 67 if (ttm_dma_tt_init(&ttm_agp->ttm_dma, bo, page_flags) != 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, struct ttm_operation_ctx *ctx) 79 { 80 81 KASSERTMSG((ttm->state == tt_unpopulated), 82 "ttm_agp_tt_populate: ttm %p state is not tt_unpopulated: %d", 83 ttm, (int)ttm->state); 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 KASSERTMSG((ttm->state == tt_unbound), 92 "ttm_agp_tt_unpopulate: ttm %p state is not tt_unbound: %d", 93 ttm, (int)ttm->state); 94 ttm_bus_dma_unpopulate(container_of(ttm, struct ttm_dma_tt, ttm)); 95 } 96 97 static int 98 ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 99 { 100 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 101 ttm_dma.ttm); 102 struct agp_softc *const sc = ttm_agp->agp; 103 struct drm_mm_node *const node = bo_mem->mm_node; 104 const unsigned long agp_pgno = node->start; 105 unsigned i, j; 106 int ret; 107 108 KASSERT(!ttm_agp->bound); 109 KASSERT(ttm_agp->ttm_dma.dma_address->dm_nsegs == ttm->num_pages); 110 for (i = 0; i < ttm->num_pages; i++) { 111 KASSERT(ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len == 112 AGP_PAGE_SIZE); 113 /* XXX errno NetBSD->Linux */ 114 ret = -AGP_BIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT, 115 ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len); 116 if (ret) 117 goto fail; 118 } 119 drm_agp_flush(); 120 AGP_FLUSH_TLB(sc); 121 122 /* Success! */ 123 ttm_agp->agp_pgno = agp_pgno; 124 ttm_agp->bound = true; 125 return 0; 126 127 fail: KASSERT(ret); 128 for (j = 0; j < i; j++) 129 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + j) << AGP_PAGE_SHIFT); 130 return ret; 131 } 132 133 static int 134 ttm_agp_unbind(struct ttm_tt *ttm) 135 { 136 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 137 ttm_dma.ttm); 138 struct agp_softc *const sc = ttm_agp->agp; 139 const unsigned long agp_pgno = ttm_agp->agp_pgno; 140 unsigned i; 141 142 /* XXX Can this happen? */ 143 if (!ttm_agp->bound) 144 return 0; 145 146 for (i = 0; i < ttm->num_pages; i++) 147 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT); 148 149 ttm_agp->agp_pgno = 0; 150 ttm_agp->bound = false; 151 return 0; 152 } 153 154 static void 155 ttm_agp_destroy(struct ttm_tt *ttm) 156 { 157 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp, 158 ttm_dma.ttm); 159 160 /* XXX Can this happen? */ 161 if (ttm_agp->bound) 162 ttm_agp_unbind(ttm); 163 ttm_tt_fini(ttm); 164 kmem_free(ttm_agp, sizeof(*ttm_agp)); 165 } 166 167 static const struct ttm_backend_func ttm_agp_backend_func = { 168 .bind = &ttm_agp_bind, 169 .unbind = &ttm_agp_unbind, 170 .destroy = &ttm_agp_destroy, 171 }; 172