597 lines
14 KiB
C
597 lines
14 KiB
C
/* $NetBSD: bus_dma.c,v 1.17 1998/03/17 04:59:36 thorpej Exp $ */
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/*-
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* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_uvm.h"
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#include "opt_pmap_new.h"
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.17 1998/03/17 04:59:36 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#if defined(UVM)
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#include <uvm/uvm_extern.h>
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#endif
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#define _ALPHA_BUS_DMA_PRIVATE
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#include <machine/bus.h>
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#include <machine/intr.h>
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int _bus_dmamap_load_buffer_direct_common __P((bus_dmamap_t,
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void *, bus_size_t, struct proc *, int, bus_addr_t,
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vm_offset_t *, int *, int));
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/*
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* Common function for DMA map creation. May be called by bus-specific
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* DMA map creation functions.
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*/
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int
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_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
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bus_dma_tag_t t;
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bus_size_t size;
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int nsegments;
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bus_size_t maxsegsz;
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bus_size_t boundary;
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int flags;
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bus_dmamap_t *dmamp;
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{
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struct alpha_bus_dmamap *map;
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void *mapstore;
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size_t mapsize;
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/*
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* Allcoate and initialize the DMA map. The end of the map
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* is a variable-sized array of segments, so we allocate enough
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* room for them in one shot.
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*
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* Note we don't preserve the WAITOK or NOWAIT flags. Preservation
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* of ALLOCNOW notifes others that we've reserved these resources,
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* and they are not to be freed.
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*
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* The bus_dmamap_t includes one bus_dma_segment_t, hence
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* the (nsegments - 1).
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*/
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mapsize = sizeof(struct alpha_bus_dmamap) +
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(sizeof(bus_dma_segment_t) * (nsegments - 1));
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if ((mapstore = malloc(mapsize, M_DMAMAP,
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(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
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return (ENOMEM);
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bzero(mapstore, mapsize);
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map = (struct alpha_bus_dmamap *)mapstore;
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map->_dm_size = size;
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map->_dm_segcnt = nsegments;
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map->_dm_maxsegsz = maxsegsz;
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map->_dm_boundary = boundary;
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map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
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map->dm_mapsize = 0; /* no valid mappings */
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map->dm_nsegs = 0;
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*dmamp = map;
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return (0);
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}
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/*
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* Common function for DMA map destruction. May be called by bus-specific
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* DMA map destruction functions.
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*/
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void
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_bus_dmamap_destroy(t, map)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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{
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free(map, M_DMAMAP);
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}
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/*
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* Utility function to load a linear buffer. lastaddrp holds state
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* between invocations (for multiple-buffer loads). segp contains
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* the starting segment on entrance, and the ending segment on exit.
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* first indicates if this is the first invocation of this function.
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*/
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int
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_bus_dmamap_load_buffer_direct_common(map, buf, buflen, p, flags, wbase,
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lastaddrp, segp, first)
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bus_dmamap_t map;
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void *buf;
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bus_size_t buflen;
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struct proc *p;
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int flags;
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bus_addr_t wbase;
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vm_offset_t *lastaddrp;
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int *segp;
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int first;
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{
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bus_size_t sgsize;
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vm_offset_t curaddr, lastaddr;
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vm_offset_t vaddr = (vm_offset_t)buf;
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int seg;
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lastaddr = *lastaddrp;
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for (seg = *segp; buflen > 0 && seg < map->_dm_segcnt; ) {
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/*
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* Get the physical address for this segment.
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*/
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if (p != NULL)
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curaddr = pmap_extract(p->p_vmspace->vm_map.pmap,
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vaddr);
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else
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curaddr = vtophys(vaddr);
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curaddr |= wbase;
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/*
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* Compute the segment size, and adjust counts.
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*/
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sgsize = NBPG - ((u_long)vaddr & PGOFSET);
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if (buflen < sgsize)
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sgsize = buflen;
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/*
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* Insert chunk into a segment, coalescing with
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* the previous segment if possible.
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*/
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if (first) {
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map->dm_segs[seg].ds_addr = curaddr;
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map->dm_segs[seg].ds_len = sgsize;
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first = 0;
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} else {
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if (curaddr == lastaddr &&
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(map->dm_segs[seg].ds_len + sgsize) <=
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map->_dm_maxsegsz)
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map->dm_segs[seg].ds_len += sgsize;
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else {
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seg++;
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map->dm_segs[seg].ds_addr = curaddr;
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map->dm_segs[seg].ds_len = sgsize;
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}
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}
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lastaddr = curaddr + sgsize;
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vaddr += sgsize;
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buflen -= sgsize;
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}
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*segp = seg;
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*lastaddrp = lastaddr;
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/*
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* Did we fit?
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*/
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if (buflen != 0) {
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/*
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* XXX Should fall back on SGMAPs.
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*/
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return (EFBIG); /* XXX better return value here? */
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}
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return (0);
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}
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/*
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* Common function for loading a direct-mapped DMA map with a linear
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* buffer. Called by bus-specific DMA map load functions with the
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* OR value appropriate for indicating "direct-mapped" for that
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* chipset.
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*/
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int
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_bus_dmamap_load_direct_common(t, map, buf, buflen, p, flags, wbase)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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void *buf;
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bus_size_t buflen;
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struct proc *p;
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int flags;
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bus_addr_t wbase;
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{
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vm_offset_t lastaddr;
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int seg, error;
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/*
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* Make sure that on error condition we return "no valid mappings".
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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if (buflen > map->_dm_size)
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return (EINVAL);
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seg = 0;
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error = _bus_dmamap_load_buffer_direct_common(map, buf, buflen,
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p, flags, wbase, &lastaddr, &seg, 1);
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if (error == 0) {
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map->dm_mapsize = buflen;
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map->dm_nsegs = seg + 1;
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}
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return (error);
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for mbufs.
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*/
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int
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_bus_dmamap_load_mbuf_direct_common(t, map, m0, flags, wbase)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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struct mbuf *m0;
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int flags;
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bus_addr_t wbase;
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{
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vm_offset_t lastaddr;
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int seg, error, first;
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struct mbuf *m;
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/*
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* Make sure that on error condition we return "no valid mappings."
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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#ifdef DIAGNOSTIC
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if ((m0->m_flags & M_PKTHDR) == 0)
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panic("_bus_dmamap_load_mbuf_direct_common: no packet header");
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#endif
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if (m0->m_pkthdr.len > map->_dm_size)
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return (EINVAL);
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first = 1;
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seg = 0;
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error = 0;
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for (m = m0; m != NULL && error == 0; m = m->m_next) {
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error = _bus_dmamap_load_buffer_direct_common(map,
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m->m_data, m->m_len, NULL, flags, wbase, &lastaddr,
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&seg, first);
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first = 0;
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}
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if (error == 0) {
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map->dm_mapsize = m0->m_pkthdr.len;
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map->dm_nsegs = seg + 1;
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}
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return (error);
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for uios.
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*/
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int
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_bus_dmamap_load_uio_direct_common(t, map, uio, flags, wbase)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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struct uio *uio;
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int flags;
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bus_addr_t wbase;
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{
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panic("_bus_dmamap_load_uio_direct_common: not implemented");
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}
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/*
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* Like _bus_dmamap_load_direct_common(), but for raw memory.
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*/
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int
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_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs, size, flags, wbase)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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bus_dma_segment_t *segs;
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int nsegs;
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bus_size_t size;
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int flags;
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bus_addr_t wbase;
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{
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panic("_bus_dmamap_load_raw_direct_common: not implemented");
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}
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/*
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* Common function for unloading a DMA map. May be called by
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* chipset-specific DMA map unload functions.
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*/
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void
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_bus_dmamap_unload(t, map)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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{
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/*
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* No resources to free; just mark the mappings as
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* invalid.
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*/
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map->dm_mapsize = 0;
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map->dm_nsegs = 0;
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}
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/*
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* Common function for DMA map synchronization. May be called
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* by chipset-specific DMA map synchronization functions.
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*/
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void
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_bus_dmamap_sync(t, map, offset, len, ops)
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bus_dma_tag_t t;
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bus_dmamap_t map;
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bus_addr_t offset;
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bus_size_t len;
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int ops;
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{
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/*
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* Flush the store buffer.
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*/
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alpha_mb();
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}
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/*
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* Common function for DMA-safe memory allocation. May be called
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* by bus-specific DMA memory allocation functions.
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*/
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int
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_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
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bus_dma_tag_t t;
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bus_size_t size, alignment, boundary;
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bus_dma_segment_t *segs;
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int nsegs;
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int *rsegs;
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int flags;
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{
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extern vm_offset_t avail_start, avail_end;
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vm_offset_t curaddr, lastaddr, high;
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vm_page_t m;
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struct pglist mlist;
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int curseg, error;
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/* Always round the size. */
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size = round_page(size);
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high = avail_end - PAGE_SIZE;
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/*
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* Allocate pages from the VM system.
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*/
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TAILQ_INIT(&mlist);
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#if defined(UVM)
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error = uvm_pglistalloc(size, avail_start, high, alignment, boundary,
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&mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
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#else
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error = vm_page_alloc_memory(size, avail_start, high,
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alignment, boundary, &mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
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#endif
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if (error)
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return (error);
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/*
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* Compute the location, size, and number of segments actually
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* returned by the VM code.
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*/
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m = mlist.tqh_first;
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curseg = 0;
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lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
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segs[curseg].ds_len = PAGE_SIZE;
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m = m->pageq.tqe_next;
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for (; m != NULL; m = m->pageq.tqe_next) {
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curaddr = VM_PAGE_TO_PHYS(m);
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#ifdef DIAGNOSTIC
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if (curaddr < avail_start || curaddr >= high) {
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printf("vm_page_alloc_memory returned non-sensical"
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" address 0x%lx\n", curaddr);
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panic("_bus_dmamem_alloc");
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}
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#endif
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if (curaddr == (lastaddr + PAGE_SIZE))
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segs[curseg].ds_len += PAGE_SIZE;
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else {
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curseg++;
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segs[curseg].ds_addr = curaddr;
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segs[curseg].ds_len = PAGE_SIZE;
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}
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lastaddr = curaddr;
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}
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*rsegs = curseg + 1;
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return (0);
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}
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/*
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* Common function for freeing DMA-safe memory. May be called by
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* bus-specific DMA memory free functions.
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*/
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void
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_bus_dmamem_free(t, segs, nsegs)
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bus_dma_tag_t t;
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bus_dma_segment_t *segs;
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int nsegs;
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{
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vm_page_t m;
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bus_addr_t addr;
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struct pglist mlist;
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int curseg;
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/*
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* Build a list of pages to free back to the VM system.
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*/
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TAILQ_INIT(&mlist);
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for (curseg = 0; curseg < nsegs; curseg++) {
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for (addr = segs[curseg].ds_addr;
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addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
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addr += PAGE_SIZE) {
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m = PHYS_TO_VM_PAGE(addr);
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TAILQ_INSERT_TAIL(&mlist, m, pageq);
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}
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}
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#if defined(UVM)
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uvm_pglistfree(&mlist);
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#else
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vm_page_free_memory(&mlist);
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#endif
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}
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/*
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* Common function for mapping DMA-safe memory. May be called by
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* bus-specific DMA memory map functions.
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*/
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int
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_bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
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bus_dma_tag_t t;
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bus_dma_segment_t *segs;
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int nsegs;
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size_t size;
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caddr_t *kvap;
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int flags;
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{
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vm_offset_t va;
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bus_addr_t addr;
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int curseg;
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/*
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* If we're only mapping 1 segment, use K0SEG, to avoid
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* TLB thrashing.
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*/
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if (nsegs == 1) {
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*kvap = (caddr_t)ALPHA_PHYS_TO_K0SEG(segs[0].ds_addr);
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return (0);
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}
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size = round_page(size);
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#if defined(UVM)
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va = uvm_km_valloc(kernel_map, size);
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#else
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va = kmem_alloc_pageable(kernel_map, size);
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#endif
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if (va == 0)
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return (ENOMEM);
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*kvap = (caddr_t)va;
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for (curseg = 0; curseg < nsegs; curseg++) {
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for (addr = segs[curseg].ds_addr;
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addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
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addr += NBPG, va += NBPG, size -= NBPG) {
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if (size == 0)
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panic("_bus_dmamem_map: size botch");
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#if defined(PMAP_NEW)
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pmap_kenter_pa(va, addr, VM_PROT_READ | VM_PROT_WRITE);
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#else
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pmap_enter(pmap_kernel(), va, addr,
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VM_PROT_READ | VM_PROT_WRITE, TRUE);
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#endif
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common function for unmapping DMA-safe memory. May be called by
|
|
* bus-specific DMA memory unmapping functions.
|
|
*/
|
|
void
|
|
_bus_dmamem_unmap(t, kva, size)
|
|
bus_dma_tag_t t;
|
|
caddr_t kva;
|
|
size_t size;
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((u_long)kva & PGOFSET)
|
|
panic("_bus_dmamem_unmap");
|
|
#endif
|
|
|
|
/*
|
|
* Nothing to do if we mapped it with K0SEG.
|
|
*/
|
|
if (kva >= (caddr_t)ALPHA_K0SEG_BASE &&
|
|
kva <= (caddr_t)ALPHA_K0SEG_END)
|
|
return;
|
|
|
|
size = round_page(size);
|
|
#if defined(UVM)
|
|
uvm_km_free(kernel_map, (vm_offset_t)kva, size);
|
|
#else
|
|
kmem_free(kernel_map, (vm_offset_t)kva, size);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
|
|
* bus-specific DMA mmap(2)'ing functions.
|
|
*/
|
|
int
|
|
_bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
|
|
bus_dma_tag_t t;
|
|
bus_dma_segment_t *segs;
|
|
int nsegs, off, prot, flags;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nsegs; i++) {
|
|
#ifdef DIAGNOSTIC
|
|
if (off & PGOFSET)
|
|
panic("_bus_dmamem_mmap: offset unaligned");
|
|
if (segs[i].ds_addr & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment unaligned");
|
|
if (segs[i].ds_len & PGOFSET)
|
|
panic("_bus_dmamem_mmap: segment size not multiple"
|
|
" of page size");
|
|
#endif
|
|
if (off >= segs[i].ds_len) {
|
|
off -= segs[i].ds_len;
|
|
continue;
|
|
}
|
|
|
|
return (alpha_btop((caddr_t)segs[i].ds_addr + off));
|
|
}
|
|
|
|
/* Page not found. */
|
|
return (-1);
|
|
}
|