1 /* $NetBSD: sgmap_common.c,v 1.13 2000/06/29 09:02:57 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 41 42 __KERNEL_RCSID(0, "$NetBSD: sgmap_common.c,v 1.13 2000/06/29 09:02:57 mrg Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/proc.h> 49 50 #include <uvm/uvm_extern.h> 51 52 #include <machine/bus.h> 53 54 #include <alpha/common/sgmapvar.h> 55 56 /* 57 * Some systems will prefetch the next page during a memory -> device DMA. 58 * This can cause machine checks if there is not a spill page after the 59 * last page of the DMA (thus avoiding hitting an invalid SGMAP PTE). 60 */ 61 vaddr_t alpha_sgmap_prefetch_spill_page_va; 62 bus_addr_t alpha_sgmap_prefetch_spill_page_pa; 63 64 void 65 alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva, 66 minptalign) 67 bus_dma_tag_t t; 68 struct alpha_sgmap *sgmap; 69 const char *name; 70 bus_addr_t wbase; 71 bus_addr_t sgvabase; 72 bus_size_t sgvasize; 73 size_t ptesize; 74 void *ptva; 75 bus_size_t minptalign; 76 { 77 bus_dma_segment_t seg; 78 size_t ptsize; 79 int rseg; 80 81 if (sgvasize & PGOFSET) { 82 printf("size botch for sgmap `%s'\n", name); 83 goto die; 84 } 85 86 sgmap->aps_wbase = wbase; 87 sgmap->aps_sgvabase = sgvabase; 88 sgmap->aps_sgvasize = sgvasize; 89 90 if (ptva != NULL) { 91 /* 92 * We already have a page table; this may be a system 93 * where the page table resides in bridge-resident SRAM. 94 */ 95 sgmap->aps_pt = ptva; 96 sgmap->aps_ptpa = 0; 97 } else { 98 /* 99 * Compute the page table size and allocate it. At minimum, 100 * this must be aligned to the page table size. However, 101 * some platforms have more strict alignment reqirements. 102 */ 103 ptsize = (sgvasize / NBPG) * ptesize; 104 if (minptalign != 0) { 105 if (minptalign < ptsize) 106 minptalign = ptsize; 107 } else 108 minptalign = ptsize; 109 if (bus_dmamem_alloc(t, ptsize, minptalign, 0, &seg, 1, &rseg, 110 BUS_DMA_NOWAIT)) { 111 panic("unable to allocate page table for sgmap `%s'\n", 112 name); 113 goto die; 114 } 115 sgmap->aps_ptpa = seg.ds_addr; 116 sgmap->aps_pt = (caddr_t)ALPHA_PHYS_TO_K0SEG(sgmap->aps_ptpa); 117 } 118 119 /* 120 * Create the extent map used to manage the virtual address 121 * space. 122 */ 123 sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1, 124 M_DMAMAP, NULL, 0, EX_NOWAIT|EX_NOCOALESCE); 125 if (sgmap->aps_ex == NULL) { 126 printf("unable to create extent map for sgmap `%s'\n", 127 name); 128 goto die; 129 } 130 131 /* 132 * Allocate a spill page if that hasn't already been done. 133 */ 134 if (alpha_sgmap_prefetch_spill_page_va == 0) { 135 if (bus_dmamem_alloc(t, NBPG, 0, 0, &seg, 1, &rseg, 136 BUS_DMA_NOWAIT)) { 137 printf("unable to allocate spill page for sgmap `%s'\n", 138 name); 139 goto die; 140 } 141 alpha_sgmap_prefetch_spill_page_pa = seg.ds_addr; 142 alpha_sgmap_prefetch_spill_page_va = 143 ALPHA_PHYS_TO_K0SEG(alpha_sgmap_prefetch_spill_page_pa); 144 bzero((caddr_t)alpha_sgmap_prefetch_spill_page_va, NBPG); 145 } 146 147 return; 148 die: 149 panic("alpha_sgmap_init"); 150 } 151 152 int 153 alpha_sgmap_alloc(map, origlen, sgmap, flags) 154 bus_dmamap_t map; 155 bus_size_t origlen; 156 struct alpha_sgmap *sgmap; 157 int flags; 158 { 159 int error; 160 bus_size_t len = origlen, boundary, alignment; 161 162 #ifdef DIAGNOSTIC 163 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 164 panic("alpha_sgmap_alloc: already have sgva space"); 165 #endif 166 /* 167 * Add a range for spill page. 168 */ 169 len += NBPG; 170 171 /* 172 * And add an additional amount in case of ALLOCNOW. 173 */ 174 if (flags & BUS_DMA_ALLOCNOW) 175 len += NBPG; 176 177 map->_dm_sgvalen = round_page(len); 178 179 /* 180 * ARGH! If the addition of spill pages bumped us over our 181 * boundary, we have to 2x the boundary limit. 182 */ 183 boundary = map->_dm_boundary; 184 if (boundary && boundary < map->_dm_sgvalen) { 185 alignment = boundary; 186 do { 187 boundary <<= 1; 188 } while (boundary < map->_dm_sgvalen); 189 } else 190 alignment = NBPG; 191 #if 0 192 printf("len %x -> %x, _dm_sgvalen %x _dm_boundary %x boundary %x -> ", 193 origlen, len, map->_dm_sgvalen, map->_dm_boundary, boundary); 194 #endif 195 196 error = extent_alloc(sgmap->aps_ex, map->_dm_sgvalen, alignment, 197 boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : EX_WAITOK, 198 &map->_dm_sgva); 199 #if 0 200 printf("error %d _dm_sgva %x\n", error, map->_dm_sgva); 201 #endif 202 203 if (error == 0) 204 map->_dm_flags |= DMAMAP_HAS_SGMAP; 205 else 206 map->_dm_flags &= ~DMAMAP_HAS_SGMAP; 207 208 return (error); 209 } 210 211 void 212 alpha_sgmap_free(map, sgmap) 213 bus_dmamap_t map; 214 struct alpha_sgmap *sgmap; 215 { 216 217 #ifdef DIAGNOSTIC 218 if ((map->_dm_flags & DMAMAP_HAS_SGMAP) == 0) 219 panic("alpha_sgmap_free: no sgva space to free"); 220 #endif 221 222 if (extent_free(sgmap->aps_ex, map->_dm_sgva, map->_dm_sgvalen, 223 EX_NOWAIT)) 224 panic("alpha_sgmap_free"); 225 226 map->_dm_flags &= ~DMAMAP_HAS_SGMAP; 227 } 228