sgmap_common.c revision 1.18.2.2
1 1.18.2.2 nathanw /* $NetBSD: sgmap_common.c,v 1.18.2.2 2002/10/18 02:34:06 nathanw Exp $ */ 2 1.18.2.2 nathanw 3 1.18.2.2 nathanw /*- 4 1.18.2.2 nathanw * Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc. 5 1.18.2.2 nathanw * All rights reserved. 6 1.18.2.2 nathanw * 7 1.18.2.2 nathanw * This code is derived from software contributed to The NetBSD Foundation 8 1.18.2.2 nathanw * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 1.18.2.2 nathanw * NASA Ames Research Center. 10 1.18.2.2 nathanw * 11 1.18.2.2 nathanw * Redistribution and use in source and binary forms, with or without 12 1.18.2.2 nathanw * modification, are permitted provided that the following conditions 13 1.18.2.2 nathanw * are met: 14 1.18.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 15 1.18.2.2 nathanw * notice, this list of conditions and the following disclaimer. 16 1.18.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 17 1.18.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 18 1.18.2.2 nathanw * documentation and/or other materials provided with the distribution. 19 1.18.2.2 nathanw * 3. All advertising materials mentioning features or use of this software 20 1.18.2.2 nathanw * must display the following acknowledgement: 21 1.18.2.2 nathanw * This product includes software developed by the NetBSD 22 1.18.2.2 nathanw * Foundation, Inc. and its contributors. 23 1.18.2.2 nathanw * 4. Neither the name of The NetBSD Foundation nor the names of its 24 1.18.2.2 nathanw * contributors may be used to endorse or promote products derived 25 1.18.2.2 nathanw * from this software without specific prior written permission. 26 1.18.2.2 nathanw * 27 1.18.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 1.18.2.2 nathanw * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 1.18.2.2 nathanw * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 1.18.2.2 nathanw * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 1.18.2.2 nathanw * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 1.18.2.2 nathanw * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 1.18.2.2 nathanw * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 1.18.2.2 nathanw * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 1.18.2.2 nathanw * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 1.18.2.2 nathanw * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 1.18.2.2 nathanw * POSSIBILITY OF SUCH DAMAGE. 38 1.18.2.2 nathanw */ 39 1.18.2.2 nathanw 40 1.18.2.2 nathanw #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 41 1.18.2.2 nathanw 42 1.18.2.2 nathanw __KERNEL_RCSID(0, "$NetBSD: sgmap_common.c,v 1.18.2.2 2002/10/18 02:34:06 nathanw Exp $"); 43 1.18.2.2 nathanw 44 1.18.2.2 nathanw #include <sys/param.h> 45 1.18.2.2 nathanw #include <sys/systm.h> 46 1.18.2.2 nathanw #include <sys/kernel.h> 47 1.18.2.2 nathanw #include <sys/malloc.h> 48 1.18.2.2 nathanw #include <sys/proc.h> 49 1.18.2.2 nathanw 50 1.18.2.2 nathanw #include <uvm/uvm_extern.h> 51 1.18.2.2 nathanw 52 1.18.2.2 nathanw #define _ALPHA_BUS_DMA_PRIVATE 53 1.18.2.2 nathanw #include <machine/bus.h> 54 1.18.2.2 nathanw 55 1.18.2.2 nathanw #include <alpha/common/sgmapvar.h> 56 1.18.2.2 nathanw 57 1.18.2.2 nathanw /* 58 1.18.2.2 nathanw * Some systems will prefetch the next page during a memory -> device DMA. 59 1.18.2.2 nathanw * This can cause machine checks if there is not a spill page after the 60 1.18.2.2 nathanw * last page of the DMA (thus avoiding hitting an invalid SGMAP PTE). 61 1.18.2.2 nathanw */ 62 1.18.2.2 nathanw vaddr_t alpha_sgmap_prefetch_spill_page_va; 63 1.18.2.2 nathanw bus_addr_t alpha_sgmap_prefetch_spill_page_pa; 64 1.18.2.2 nathanw 65 1.18.2.2 nathanw void 66 1.18.2.2 nathanw alpha_sgmap_init(bus_dma_tag_t t, struct alpha_sgmap *sgmap, const char *name, 67 1.18.2.2 nathanw bus_addr_t wbase, bus_addr_t sgvabase, bus_size_t sgvasize, size_t ptesize, 68 1.18.2.2 nathanw void *ptva, bus_size_t minptalign) 69 1.18.2.2 nathanw { 70 1.18.2.2 nathanw bus_dma_segment_t seg; 71 1.18.2.2 nathanw size_t ptsize; 72 1.18.2.2 nathanw int rseg; 73 1.18.2.2 nathanw 74 1.18.2.2 nathanw if (sgvasize & PGOFSET) { 75 1.18.2.2 nathanw printf("size botch for sgmap `%s'\n", name); 76 1.18.2.2 nathanw goto die; 77 1.18.2.2 nathanw } 78 1.18.2.2 nathanw 79 1.18.2.2 nathanw sgmap->aps_wbase = wbase; 80 1.18.2.2 nathanw sgmap->aps_sgvabase = sgvabase; 81 1.18.2.2 nathanw sgmap->aps_sgvasize = sgvasize; 82 1.18.2.2 nathanw 83 1.18.2.2 nathanw if (ptva != NULL) { 84 1.18.2.2 nathanw /* 85 1.18.2.2 nathanw * We already have a page table; this may be a system 86 1.18.2.2 nathanw * where the page table resides in bridge-resident SRAM. 87 1.18.2.2 nathanw */ 88 1.18.2.2 nathanw sgmap->aps_pt = ptva; 89 1.18.2.2 nathanw sgmap->aps_ptpa = 0; 90 1.18.2.2 nathanw } else { 91 1.18.2.2 nathanw /* 92 1.18.2.2 nathanw * Compute the page table size and allocate it. At minimum, 93 1.18.2.2 nathanw * this must be aligned to the page table size. However, 94 1.18.2.2 nathanw * some platforms have more strict alignment reqirements. 95 1.18.2.2 nathanw */ 96 1.18.2.2 nathanw ptsize = (sgvasize / NBPG) * ptesize; 97 1.18.2.2 nathanw if (minptalign != 0) { 98 1.18.2.2 nathanw if (minptalign < ptsize) 99 1.18.2.2 nathanw minptalign = ptsize; 100 1.18.2.2 nathanw } else 101 1.18.2.2 nathanw minptalign = ptsize; 102 1.18.2.2 nathanw if (bus_dmamem_alloc(t, ptsize, minptalign, 0, &seg, 1, &rseg, 103 1.18.2.2 nathanw BUS_DMA_NOWAIT)) { 104 1.18.2.2 nathanw panic("unable to allocate page table for sgmap `%s'", 105 1.18.2.2 nathanw name); 106 1.18.2.2 nathanw goto die; 107 1.18.2.2 nathanw } 108 1.18.2.2 nathanw sgmap->aps_ptpa = seg.ds_addr; 109 1.18.2.2 nathanw sgmap->aps_pt = (caddr_t)ALPHA_PHYS_TO_K0SEG(sgmap->aps_ptpa); 110 1.18.2.2 nathanw } 111 1.18.2.2 nathanw 112 1.18.2.2 nathanw /* 113 1.18.2.2 nathanw * Create the extent map used to manage the virtual address 114 1.18.2.2 nathanw * space. 115 1.18.2.2 nathanw */ 116 1.18.2.2 nathanw sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1, 117 1.18.2.2 nathanw M_DMAMAP, NULL, 0, EX_NOWAIT|EX_NOCOALESCE); 118 1.18.2.2 nathanw if (sgmap->aps_ex == NULL) { 119 1.18.2.2 nathanw printf("unable to create extent map for sgmap `%s'\n", 120 1.18.2.2 nathanw name); 121 1.18.2.2 nathanw goto die; 122 1.18.2.2 nathanw } 123 1.18.2.2 nathanw 124 1.18.2.2 nathanw /* 125 1.18.2.2 nathanw * Allocate a spill page if that hasn't already been done. 126 1.18.2.2 nathanw */ 127 1.18.2.2 nathanw if (alpha_sgmap_prefetch_spill_page_va == 0) { 128 1.18.2.2 nathanw if (bus_dmamem_alloc(t, NBPG, 0, 0, &seg, 1, &rseg, 129 1.18.2.2 nathanw BUS_DMA_NOWAIT)) { 130 1.18.2.2 nathanw printf("unable to allocate spill page for sgmap `%s'\n", 131 1.18.2.2 nathanw name); 132 1.18.2.2 nathanw goto die; 133 1.18.2.2 nathanw } 134 1.18.2.2 nathanw alpha_sgmap_prefetch_spill_page_pa = seg.ds_addr; 135 1.18.2.2 nathanw alpha_sgmap_prefetch_spill_page_va = 136 1.18.2.2 nathanw ALPHA_PHYS_TO_K0SEG(alpha_sgmap_prefetch_spill_page_pa); 137 1.18.2.2 nathanw memset((caddr_t)alpha_sgmap_prefetch_spill_page_va, 0, NBPG); 138 1.18.2.2 nathanw } 139 1.18.2.2 nathanw 140 1.18.2.2 nathanw return; 141 1.18.2.2 nathanw die: 142 1.18.2.2 nathanw panic("alpha_sgmap_init"); 143 1.18.2.2 nathanw } 144 1.18.2.2 nathanw 145 1.18.2.2 nathanw int 146 1.18.2.2 nathanw alpha_sgmap_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 147 1.18.2.2 nathanw bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 148 1.18.2.2 nathanw { 149 1.18.2.2 nathanw bus_dmamap_t map; 150 1.18.2.2 nathanw int error; 151 1.18.2.2 nathanw 152 1.18.2.2 nathanw error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 153 1.18.2.2 nathanw boundary, flags, &map); 154 1.18.2.2 nathanw if (error) 155 1.18.2.2 nathanw return (error); 156 1.18.2.2 nathanw 157 1.18.2.2 nathanw /* XXX BUS_DMA_ALLOCNOW */ 158 1.18.2.2 nathanw 159 1.18.2.2 nathanw if (error == 0) 160 1.18.2.2 nathanw *dmamp = map; 161 1.18.2.2 nathanw else 162 1.18.2.2 nathanw alpha_sgmap_dmamap_destroy(t, map); 163 1.18.2.2 nathanw 164 1.18.2.2 nathanw return (error); 165 1.18.2.2 nathanw } 166 1.18.2.2 nathanw 167 1.18.2.2 nathanw void 168 1.18.2.2 nathanw alpha_sgmap_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 169 1.18.2.2 nathanw { 170 1.18.2.2 nathanw 171 1.18.2.2 nathanw KASSERT(map->dm_mapsize == 0); 172 1.18.2.2 nathanw 173 1.18.2.2 nathanw _bus_dmamap_destroy(t, map); 174 1.18.2.2 nathanw } 175
Indexes created Sun Oct 19 19:09:49 GMT 2025