/* $OpenBSD: sgmap_common.c,v 1.1 2001/03/21 17:26:38 art Exp $ */ /* $NetBSD: sgmap_common.c,v 1.13 2000/06/29 09:02:57 mrg Exp $ */ /*- * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include /* * Some systems will prefetch the next page during a memory -> device DMA. * This can cause machine checks if there is not a spill page after the * last page of the DMA (thus avoiding hitting an invalid SGMAP PTE). */ vaddr_t alpha_sgmap_prefetch_spill_page_va; bus_addr_t alpha_sgmap_prefetch_spill_page_pa; void alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva, minptalign) bus_dma_tag_t t; struct alpha_sgmap *sgmap; const char *name; bus_addr_t wbase; bus_addr_t sgvabase; bus_size_t sgvasize; size_t ptesize; void *ptva; bus_size_t minptalign; { bus_dma_segment_t seg; size_t ptsize; int rseg; if (sgvasize & PGOFSET) { printf("size botch for sgmap `%s'\n", name); goto die; } sgmap->aps_wbase = wbase; sgmap->aps_sgvabase = sgvabase; sgmap->aps_sgvasize = sgvasize; if (ptva != NULL) { /* * We already have a page table; this may be a system * where the page table resides in bridge-resident SRAM. */ sgmap->aps_pt = ptva; sgmap->aps_ptpa = 0; } else { /* * Compute the page table size and allocate it. At minimum, * this must be aligned to the page table size. However, * some platforms have more strict alignment reqirements. */ ptsize = (sgvasize / NBPG) * ptesize; if (minptalign != 0) { if (minptalign < ptsize) minptalign = ptsize; } else minptalign = ptsize; if (bus_dmamem_alloc(t, ptsize, minptalign, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) { panic("unable to allocate page table for sgmap `%s'\n", name); goto die; } sgmap->aps_ptpa = seg.ds_addr; sgmap->aps_pt = (caddr_t)ALPHA_PHYS_TO_K0SEG(sgmap->aps_ptpa); } /* * Create the extent map used to manage the virtual address * space. */ sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1, M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE); if (sgmap->aps_ex == NULL) { printf("unable to create extent map for sgmap `%s'\n", name); goto die; } /* * Allocate a spill page if that hasn't already been done. */ if (alpha_sgmap_prefetch_spill_page_va == 0) { if (bus_dmamem_alloc(t, NBPG, 0, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) { printf("unable to allocate spill page for sgmap `%s'\n", name); goto die; } alpha_sgmap_prefetch_spill_page_pa = seg.ds_addr; alpha_sgmap_prefetch_spill_page_va = ALPHA_PHYS_TO_K0SEG(alpha_sgmap_prefetch_spill_page_pa); bzero((caddr_t)alpha_sgmap_prefetch_spill_page_va, NBPG); } return; die: panic("alpha_sgmap_init"); } int alpha_sgmap_alloc(map, origlen, sgmap, flags) bus_dmamap_t map; bus_size_t origlen; struct alpha_sgmap *sgmap; int flags; { int error; bus_size_t len = origlen, boundary, alignment; #ifdef DIAGNOSTIC if (map->_dm_flags & DMAMAP_HAS_SGMAP) panic("alpha_sgmap_alloc: already have sgva space"); #endif /* * Add a range for spill page. */ len += NBPG; /* * And add an additional amount in case of ALLOCNOW. */ if (flags & BUS_DMA_ALLOCNOW) len += NBPG; map->_dm_sgvalen = round_page(len); /* * ARGH! If the addition of spill pages bumped us over our * boundary, we have to 2x the boundary limit. */ boundary = map->_dm_boundary; if (boundary && boundary < map->_dm_sgvalen) { alignment = boundary; do { boundary <<= 1; } while (boundary < map->_dm_sgvalen); } else alignment = NBPG; #if 0 printf("len %x -> %x, _dm_sgvalen %x _dm_boundary %x boundary %x -> ", origlen, len, map->_dm_sgvalen, map->_dm_boundary, boundary); #endif error = extent_alloc(sgmap->aps_ex, map->_dm_sgvalen, alignment, boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : EX_WAITOK, &map->_dm_sgva); #if 0 printf("error %d _dm_sgva %x\n", error, map->_dm_sgva); #endif if (error == 0) map->_dm_flags |= DMAMAP_HAS_SGMAP; else map->_dm_flags &= ~DMAMAP_HAS_SGMAP; return (error); } void alpha_sgmap_free(map, sgmap) bus_dmamap_t map; struct alpha_sgmap *sgmap; { #ifdef DIAGNOSTIC if ((map->_dm_flags & DMAMAP_HAS_SGMAP) == 0) panic("alpha_sgmap_free: no sgva space to free"); #endif if (extent_free(sgmap->aps_ex, map->_dm_sgva, map->_dm_sgvalen, EX_NOWAIT)) panic("alpha_sgmap_free"); map->_dm_flags &= ~DMAMAP_HAS_SGMAP; }