Port the i386 bus_dma implementation to alpha.
This commit is contained in:
Doug Rabson
parent
c87ddee143
commit
3bb8652fa7
651
sys/alpha/alpha/busdma_machdep.c
Normal file
651
sys/alpha/alpha/busdma_machdep.c
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@ -0,0 +1,651 @@
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/*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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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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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_page.h>
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#include <machine/bus.h>
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#include <machine/md_var.h>
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#define MAX(a,b) (((a) > (b)) ? (a) : (b))
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#define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#define MAX_BPAGES 128
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struct bus_dma_tag {
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bus_dma_tag_t parent;
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bus_size_t alignment;
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bus_size_t boundary;
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bus_addr_t lowaddr;
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bus_addr_t highaddr;
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bus_dma_filter_t *filter;
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void *filterarg;
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bus_size_t maxsize;
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u_int nsegments;
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bus_size_t maxsegsz;
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int flags;
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int ref_count;
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int map_count;
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};
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struct bounce_page {
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vm_offset_t vaddr; /* kva of bounce buffer */
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bus_addr_t busaddr; /* Physical address */
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vm_offset_t datavaddr; /* kva of client data */
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bus_size_t datacount; /* client data count */
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STAILQ_ENTRY(bounce_page) links;
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};
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int busdma_swi_pending;
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static STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
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static int free_bpages;
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static int reserved_bpages;
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static int active_bpages;
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static int total_bpages;
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static bus_addr_t bounce_lowaddr = BUS_SPACE_MAXADDR;
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struct bus_dmamap {
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struct bp_list bpages;
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int pagesneeded;
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int pagesreserved;
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bus_dma_tag_t dmat;
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void *buf; /* unmapped buffer pointer */
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bus_size_t buflen; /* unmapped buffer length */
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bus_dmamap_callback_t *callback;
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void *callback_arg;
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STAILQ_ENTRY(bus_dmamap) links;
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};
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static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist;
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static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist;
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static struct bus_dmamap nobounce_dmamap;
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static int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages);
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static int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map);
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static vm_offset_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map,
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vm_offset_t vaddr, bus_size_t size);
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static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage);
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static __inline int run_filter(bus_dma_tag_t dmat, bus_addr_t paddr);
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static __inline int
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run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
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{
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int retval;
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retval = 0;
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do {
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if (paddr > dmat->lowaddr
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&& paddr <= dmat->highaddr
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&& (dmat->filter == NULL
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|| (*dmat->filter)(dmat->filterarg, paddr) != 0))
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retval = 1;
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dmat = dmat->parent;
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} while (retval == 0 && dmat != NULL);
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return (retval);
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}
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#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
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/*
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* Allocate a device specific dma_tag.
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*/
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int
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bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
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bus_size_t boundary, bus_addr_t lowaddr,
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bus_addr_t highaddr, bus_dma_filter_t *filter,
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void *filterarg, bus_size_t maxsize, int nsegments,
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bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat)
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{
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bus_dma_tag_t newtag;
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int error = 0;
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/* Return a NULL tag on failure */
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*dmat = NULL;
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newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT);
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if (newtag == NULL)
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return (ENOMEM);
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newtag->parent = parent;
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newtag->boundary = boundary;
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newtag->lowaddr = trunc_page(lowaddr) + (PAGE_SIZE - 1);
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newtag->highaddr = trunc_page(highaddr) + (PAGE_SIZE - 1);
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newtag->filter = filter;
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newtag->filterarg = filterarg;
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newtag->maxsize = maxsize;
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newtag->nsegments = nsegments;
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newtag->maxsegsz = maxsegsz;
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newtag->flags = flags;
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newtag->ref_count = 1; /* Count ourself */
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newtag->map_count = 0;
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/* Take into account any restrictions imposed by our parent tag */
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if (parent != NULL) {
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newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr);
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newtag->highaddr = MAX(parent->highaddr, newtag->highaddr);
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/*
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* XXX Not really correct??? Probably need to honor boundary
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* all the way up the inheritence chain.
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*/
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newtag->boundary = MAX(parent->boundary, newtag->boundary);
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if (newtag->filter == NULL) {
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/*
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* Short circuit looking at our parent directly
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* since we have encapsulated all of its information
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*/
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newtag->filter = parent->filter;
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newtag->filterarg = parent->filterarg;
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newtag->parent = parent->parent;
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}
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if (newtag->parent != NULL) {
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parent->ref_count++;
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}
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}
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if (newtag->lowaddr < ptoa(Maxmem) && (flags & BUS_DMA_ALLOCNOW) != 0) {
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/* Must bounce */
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if (lowaddr > bounce_lowaddr) {
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/*
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* Go through the pool and kill any pages
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* that don't reside below lowaddr.
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*/
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panic("bus_dma_tag_create: page reallocation "
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"not implemented");
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}
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if (ptoa(total_bpages) < maxsize) {
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int pages;
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pages = atop(maxsize) - total_bpages;
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/* Add pages to our bounce pool */
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if (alloc_bounce_pages(newtag, pages) < pages)
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error = ENOMEM;
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}
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/* Performed initial allocation */
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newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
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}
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if (error != 0) {
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free(newtag, M_DEVBUF);
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} else {
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*dmat = newtag;
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}
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return (error);
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}
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int
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bus_dma_tag_destroy(bus_dma_tag_t dmat)
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{
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if (dmat != NULL) {
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if (dmat->map_count != 0)
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return (EBUSY);
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while (dmat != NULL) {
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bus_dma_tag_t parent;
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parent = dmat->parent;
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dmat->ref_count--;
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if (dmat->ref_count == 0) {
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free(dmat, M_DEVBUF);
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}
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dmat = parent;
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}
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}
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return (0);
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}
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/*
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* Allocate a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int
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bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
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{
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int error;
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error = 0;
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if (dmat->lowaddr < ptoa(Maxmem)) {
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/* Must bounce */
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int maxpages;
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*mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
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M_NOWAIT);
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if (*mapp == NULL) {
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return (ENOMEM);
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} else {
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/* Initialize the new map */
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bzero(*mapp, sizeof(**mapp));
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STAILQ_INIT(&((*mapp)->bpages));
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}
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/*
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* Attempt to add pages to our pool on a per-instance
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* basis up to a sane limit.
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*/
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maxpages = MIN(MAX_BPAGES, Maxmem - atop(dmat->lowaddr));
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if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
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|| (dmat->map_count > 0
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&& total_bpages < maxpages)) {
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int pages;
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if (dmat->lowaddr > bounce_lowaddr) {
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/*
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* Go through the pool and kill any pages
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* that don't reside below lowaddr.
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*/
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panic("bus_dmamap_create: page reallocation "
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"not implemented");
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}
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pages = atop(dmat->maxsize);
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pages = MIN(maxpages - total_bpages, pages);
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error = alloc_bounce_pages(dmat, pages);
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if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
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if (error == 0)
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dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
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} else {
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error = 0;
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}
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}
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} else {
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*mapp = &nobounce_dmamap;
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}
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if (error == 0)
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dmat->map_count++;
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return (error);
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}
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/*
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* Destroy a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int
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bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
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{
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if (map != NULL) {
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if (STAILQ_FIRST(&map->bpages) != NULL)
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return (EBUSY);
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free(map, M_DEVBUF);
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}
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dmat->map_count--;
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return (0);
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}
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/*
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* Allocate a piece of memory that can be efficiently mapped into
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* bus device space based on the constraints lited in the dma tag.
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* A dmamap to for use with dmamap_load is also allocated.
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*/
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int
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bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
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bus_dmamap_t *mapp)
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{
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/* If we succeed, no mapping/bouncing will be required */
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*mapp = &nobounce_dmamap;
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if ((dmat->maxsize <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem)) {
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*vaddr = malloc(dmat->maxsize, M_DEVBUF,
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(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK);
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} else {
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/*
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* XXX Use Contigmalloc until it is merged into this facility
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* and handles multi-seg allocations. Nobody is doing
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* multi-seg allocations yet though.
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*/
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*vaddr = contigmalloc(dmat->maxsize, M_DEVBUF,
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(flags & BUS_DMA_NOWAIT)
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? M_NOWAIT : M_WAITOK,
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0ul, dmat->lowaddr, 1ul, dmat->boundary);
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}
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if (*vaddr == NULL)
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return (ENOMEM);
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return (0);
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}
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/*
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* Free a piece of memory and it's allociated dmamap, that was allocated
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* via bus_dmamem_alloc.
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*/
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void
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bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
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{
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/*
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* dmamem does not need to be bounced, so the map should be
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* NULL
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*/
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if (map != &nobounce_dmamap)
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panic("bus_dmamem_free: Invalid map freed\n");
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free(vaddr, M_DEVBUF);
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}
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#define BUS_DMAMAP_NSEGS ((BUS_SPACE_MAXSIZE / PAGE_SIZE) + 1)
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/*
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* Map the buffer buf into bus space using the dmamap map.
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*/
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int
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bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
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bus_size_t buflen, bus_dmamap_callback_t *callback,
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void *callback_arg, int flags)
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{
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vm_offset_t vaddr;
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vm_offset_t paddr;
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#ifdef __GNUC__
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bus_dma_segment_t dm_segments[dmat->nsegments];
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#else
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bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS];
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#endif
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bus_dma_segment_t *sg;
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int seg;
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int error;
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error = 0;
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/*
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* If we are being called during a callback, pagesneeded will
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* be non-zero, so we can avoid doing the work twice.
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*/
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if (dmat->lowaddr < ptoa(Maxmem) && map->pagesneeded == 0) {
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vm_offset_t vendaddr;
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/*
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* Count the number of bounce pages
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* needed in order to complete this transfer
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*/
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vaddr = trunc_page(buf);
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vendaddr = (vm_offset_t)buf + buflen;
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while (vaddr < vendaddr) {
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paddr = pmap_kextract(vaddr);
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if (run_filter(dmat, paddr) != 0) {
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map->pagesneeded++;
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}
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vaddr += PAGE_SIZE;
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}
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}
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/* Reserve Necessary Bounce Pages */
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if (map->pagesneeded != 0) {
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int s;
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s = splhigh();
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if (reserve_bounce_pages(dmat, map) != 0) {
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/* Queue us for resources */
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map->dmat = dmat;
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map->buf = buf;
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map->buflen = buflen;
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map->callback = callback;
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map->callback_arg = callback_arg;
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STAILQ_INSERT_TAIL(&bounce_map_waitinglist, map, links);
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splx(s);
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return (EINPROGRESS);
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}
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splx(s);
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}
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vaddr = (vm_offset_t)buf;
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sg = &dm_segments[0];
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seg = 1;
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sg->ds_len = 0;
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do {
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bus_size_t size;
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vm_offset_t nextpaddr; /* GCC warning expected */
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paddr = pmap_kextract(vaddr);
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size = PAGE_SIZE - (paddr & PAGE_MASK);
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if (size > buflen)
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size = buflen;
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if (map->pagesneeded != 0
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&& run_filter(dmat, paddr)) {
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paddr = add_bounce_page(dmat, map, vaddr, size);
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}
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if (sg->ds_len == 0) {
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sg->ds_addr = paddr + 1*1024*1024*1024; /* XXX */
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sg->ds_len = size;
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} else if (paddr == nextpaddr) {
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sg->ds_len += size;
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} else {
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/* Go to the next segment */
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sg++;
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seg++;
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if (seg > dmat->nsegments)
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break;
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sg->ds_addr = paddr + 1*1024*1024*1024; /* XXX */
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sg->ds_len = size;
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}
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vaddr += size;
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nextpaddr = paddr + size;
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buflen -= size;
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} while (buflen > 0);
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if (buflen != 0) {
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printf("bus_dmamap_load: Too many segs! buf_len = 0x%lx\n",
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buflen);
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error = EFBIG;
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}
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(*callback)(callback_arg, dm_segments, seg, error);
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return (0);
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}
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/*
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* Release the mapping held by map.
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*/
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void
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_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
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{
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struct bounce_page *bpage;
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while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
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STAILQ_REMOVE_HEAD(&map->bpages, links);
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free_bounce_page(dmat, bpage);
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}
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}
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void
|
||||
_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
|
||||
{
|
||||
struct bounce_page *bpage;
|
||||
|
||||
if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
|
||||
|
||||
/*
|
||||
* Handle data bouncing. We might also
|
||||
* want to add support for invalidating
|
||||
* the caches on broken hardware
|
||||
*/
|
||||
switch (op) {
|
||||
case BUS_DMASYNC_PREWRITE:
|
||||
while (bpage != NULL) {
|
||||
bcopy((void *)bpage->datavaddr,
|
||||
(void *)bpage->vaddr,
|
||||
bpage->datacount);
|
||||
bpage = STAILQ_NEXT(bpage, links);
|
||||
}
|
||||
break;
|
||||
|
||||
case BUS_DMASYNC_POSTREAD:
|
||||
while (bpage != NULL) {
|
||||
bcopy((void *)bpage->vaddr,
|
||||
(void *)bpage->datavaddr,
|
||||
bpage->datacount);
|
||||
bpage = STAILQ_NEXT(bpage, links);
|
||||
}
|
||||
break;
|
||||
case BUS_DMASYNC_PREREAD:
|
||||
case BUS_DMASYNC_POSTWRITE:
|
||||
/* No-ops */
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
|
||||
{
|
||||
int count;
|
||||
|
||||
count = 0;
|
||||
if (total_bpages == 0) {
|
||||
STAILQ_INIT(&bounce_page_list);
|
||||
STAILQ_INIT(&bounce_map_waitinglist);
|
||||
STAILQ_INIT(&bounce_map_callbacklist);
|
||||
}
|
||||
|
||||
while (numpages > 0) {
|
||||
struct bounce_page *bpage;
|
||||
int s;
|
||||
|
||||
bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF,
|
||||
M_NOWAIT);
|
||||
|
||||
if (bpage == NULL)
|
||||
break;
|
||||
bzero(bpage, sizeof(*bpage));
|
||||
bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
|
||||
M_NOWAIT, 0ul,
|
||||
dmat->lowaddr,
|
||||
PAGE_SIZE,
|
||||
0);
|
||||
if (bpage->vaddr == NULL) {
|
||||
free(bpage, M_DEVBUF);
|
||||
break;
|
||||
}
|
||||
bpage->busaddr = pmap_kextract(bpage->vaddr);
|
||||
s = splhigh();
|
||||
STAILQ_INSERT_TAIL(&bounce_page_list, bpage, links);
|
||||
total_bpages++;
|
||||
free_bpages++;
|
||||
splx(s);
|
||||
count++;
|
||||
numpages--;
|
||||
}
|
||||
return (count);
|
||||
}
|
||||
|
||||
static int
|
||||
reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map)
|
||||
{
|
||||
int pages;
|
||||
|
||||
pages = MIN(free_bpages, map->pagesneeded - map->pagesreserved);
|
||||
free_bpages -= pages;
|
||||
reserved_bpages += pages;
|
||||
map->pagesreserved += pages;
|
||||
pages = map->pagesneeded - map->pagesreserved;
|
||||
|
||||
return (pages);
|
||||
}
|
||||
|
||||
static vm_offset_t
|
||||
add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
|
||||
bus_size_t size)
|
||||
{
|
||||
int s;
|
||||
struct bounce_page *bpage;
|
||||
|
||||
if (map->pagesneeded == 0)
|
||||
panic("add_bounce_page: map doesn't need any pages");
|
||||
map->pagesneeded--;
|
||||
|
||||
if (map->pagesreserved == 0)
|
||||
panic("add_bounce_page: map doesn't need any pages");
|
||||
map->pagesreserved--;
|
||||
|
||||
s = splhigh();
|
||||
bpage = STAILQ_FIRST(&bounce_page_list);
|
||||
if (bpage == NULL)
|
||||
panic("add_bounce_page: free page list is empty");
|
||||
|
||||
STAILQ_REMOVE_HEAD(&bounce_page_list, links);
|
||||
reserved_bpages--;
|
||||
active_bpages++;
|
||||
splx(s);
|
||||
|
||||
bpage->datavaddr = vaddr;
|
||||
bpage->datacount = size;
|
||||
STAILQ_INSERT_TAIL(&(map->bpages), bpage, links);
|
||||
return (bpage->busaddr);
|
||||
}
|
||||
|
||||
static void
|
||||
free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
|
||||
{
|
||||
int s;
|
||||
struct bus_dmamap *map;
|
||||
|
||||
bpage->datavaddr = 0;
|
||||
bpage->datacount = 0;
|
||||
|
||||
s = splhigh();
|
||||
STAILQ_INSERT_HEAD(&bounce_page_list, bpage, links);
|
||||
free_bpages++;
|
||||
active_bpages--;
|
||||
if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) {
|
||||
if (reserve_bounce_pages(map->dmat, map) == 0) {
|
||||
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
|
||||
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
|
||||
map, links);
|
||||
busdma_swi_pending = 1;
|
||||
setsoftvm();
|
||||
}
|
||||
}
|
||||
splx(s);
|
||||
}
|
||||
|
||||
void
|
||||
busdma_swi()
|
||||
{
|
||||
int s;
|
||||
struct bus_dmamap *map;
|
||||
|
||||
s = splhigh();
|
||||
while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) {
|
||||
STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links);
|
||||
splx(s);
|
||||
bus_dmamap_load(map->dmat, map, map->buf, map->buflen,
|
||||
map->callback, map->callback_arg, /*flags*/0);
|
||||
s = splhigh();
|
||||
}
|
||||
splx(s);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user