371e0a7254
Several files use the internal name of `struct device` instead of `device_t` which is part of the public API. This patch changes all `struct device *` to `device_t`. The remaining occurrences of `struct device` are those referring to the Linux or OpenBSD version of the structure, or the code is not built on FreeBSD and it's unclear what to do. Submitted by: Matthew Macy <mmacy@nextbsd.org> (previous version) Approved by: emaste, jhibbits, sbruno MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D7447
1221 lines
31 KiB
C
1221 lines
31 KiB
C
/*-
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* Copyright (c) 1997, 1998 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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/*
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* From amd64/busdma_machdep.c, r204214
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/memdesc.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_map.h>
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#include <machine/atomic.h>
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#include <machine/bus.h>
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#include <machine/cpufunc.h>
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#include <machine/md_var.h>
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#include "iommu_if.h"
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#define MAX_BPAGES MIN(8192, physmem/40)
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struct bounce_zone;
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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_addr_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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bus_dma_lock_t *lockfunc;
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void *lockfuncarg;
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struct bounce_zone *bounce_zone;
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device_t iommu;
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void *iommu_cookie;
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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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vm_page_t datapage; /* physical page of client data */
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vm_offset_t dataoffs; /* page offset 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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struct bounce_zone {
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STAILQ_ENTRY(bounce_zone) links;
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STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
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int total_bpages;
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int free_bpages;
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int reserved_bpages;
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int active_bpages;
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int total_bounced;
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int total_deferred;
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int map_count;
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bus_size_t alignment;
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bus_addr_t lowaddr;
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char zoneid[8];
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char lowaddrid[20];
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struct sysctl_ctx_list sysctl_tree;
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struct sysctl_oid *sysctl_tree_top;
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};
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static struct mtx bounce_lock;
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static int total_bpages;
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static int busdma_zonecount;
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static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
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static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters");
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SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0,
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"Total bounce pages");
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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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struct memdesc mem;
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bus_dma_segment_t *segments;
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int nsegs;
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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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int contigalloc;
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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 void init_bounce_pages(void *dummy);
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static int alloc_bounce_zone(bus_dma_tag_t dmat);
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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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int commit);
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static bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map,
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vm_offset_t vaddr, bus_addr_t addr,
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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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/*
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* Return true if a match is made.
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*
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* To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
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*
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* If paddr is within the bounds of the dma tag then call the filter callback
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* to check for a match, if there is no filter callback then assume a match.
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*/
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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 (dmat->filter == NULL && dmat->iommu == NULL &&
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paddr > dmat->lowaddr && paddr <= dmat->highaddr)
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retval = 1;
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if (dmat->filter == NULL &&
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(paddr & (dmat->alignment - 1)) != 0)
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retval = 1;
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if (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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/*
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* Convenience function for manipulating driver locks from busdma (during
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* busdma_swi, for example). Drivers that don't provide their own locks
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* should specify &Giant to dmat->lockfuncarg. Drivers that use their own
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* non-mutex locking scheme don't have to use this at all.
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*/
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void
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busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
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{
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struct mtx *dmtx;
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dmtx = (struct mtx *)arg;
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switch (op) {
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case BUS_DMA_LOCK:
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mtx_lock(dmtx);
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break;
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case BUS_DMA_UNLOCK:
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mtx_unlock(dmtx);
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break;
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default:
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panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
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}
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}
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/*
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* dflt_lock should never get called. It gets put into the dma tag when
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* lockfunc == NULL, which is only valid if the maps that are associated
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* with the tag are meant to never be defered.
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* XXX Should have a way to identify which driver is responsible here.
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*/
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static void
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dflt_lock(void *arg, bus_dma_lock_op_t op)
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{
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panic("driver error: busdma dflt_lock called");
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}
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#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
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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_addr_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_lock_t *lockfunc,
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void *lockfuncarg, 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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/* Basic sanity checking */
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if (boundary != 0 && boundary < maxsegsz)
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maxsegsz = boundary;
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if (maxsegsz == 0) {
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return (EINVAL);
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}
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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,
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M_ZERO | M_NOWAIT);
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if (newtag == NULL) {
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CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
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__func__, newtag, 0, error);
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return (ENOMEM);
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}
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newtag->parent = parent;
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newtag->alignment = alignment;
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newtag->boundary = boundary;
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newtag->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
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newtag->highaddr = trunc_page((vm_paddr_t)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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if (lockfunc != NULL) {
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newtag->lockfunc = lockfunc;
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newtag->lockfuncarg = lockfuncarg;
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} else {
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newtag->lockfunc = dflt_lock;
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newtag->lockfuncarg = NULL;
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}
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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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if (newtag->boundary == 0)
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newtag->boundary = parent->boundary;
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else if (parent->boundary != 0)
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newtag->boundary = MIN(parent->boundary,
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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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atomic_add_int(&parent->ref_count, 1);
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newtag->iommu = parent->iommu;
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newtag->iommu_cookie = parent->iommu_cookie;
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}
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if (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem) && newtag->iommu == NULL)
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newtag->flags |= BUS_DMA_COULD_BOUNCE;
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if (newtag->alignment > 1)
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newtag->flags |= BUS_DMA_COULD_BOUNCE;
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if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
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(flags & BUS_DMA_ALLOCNOW) != 0) {
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struct bounce_zone *bz;
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/* Must bounce */
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if ((error = alloc_bounce_zone(newtag)) != 0) {
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free(newtag, M_DEVBUF);
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return (error);
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}
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bz = newtag->bounce_zone;
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if (ptoa(bz->total_bpages) < maxsize) {
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int pages;
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pages = atop(maxsize) - bz->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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CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
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__func__, newtag, (newtag != NULL ? newtag->flags : 0), error);
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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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bus_dma_tag_t dmat_copy;
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int error;
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error = 0;
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dmat_copy = dmat;
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if (dmat != NULL) {
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if (dmat->map_count != 0) {
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error = EBUSY;
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goto out;
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}
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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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atomic_subtract_int(&dmat->ref_count, 1);
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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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* Last reference count, so
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* release our reference
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* count on our parent.
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*/
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dmat = parent;
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} else
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dmat = NULL;
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}
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}
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out:
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CTR3(KTR_BUSDMA, "%s tag %p error %d", __func__, dmat_copy, error);
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return (error);
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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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*mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (*mapp == NULL) {
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CTR3(KTR_BUSDMA, "%s: tag %p error %d",
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__func__, dmat, ENOMEM);
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return (ENOMEM);
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}
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/*
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* Bouncing might be required if the driver asks for an active
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* exclusion region, a data alignment that is stricter than 1, and/or
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* an active address boundary.
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*/
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if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
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/* Must bounce */
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struct bounce_zone *bz;
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int maxpages;
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if (dmat->bounce_zone == NULL) {
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if ((error = alloc_bounce_zone(dmat)) != 0)
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return (error);
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}
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bz = dmat->bounce_zone;
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/* Initialize the new map */
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STAILQ_INIT(&((*mapp)->bpages));
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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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if (dmat->alignment > 1)
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maxpages = MAX_BPAGES;
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else
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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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|| (bz->map_count > 0 && bz->total_bpages < maxpages)) {
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int pages;
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pages = MAX(atop(dmat->maxsize), 1);
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pages = MIN(maxpages - bz->total_bpages, pages);
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pages = MAX(pages, 1);
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if (alloc_bounce_pages(dmat, pages) < pages)
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error = ENOMEM;
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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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bz->map_count++;
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}
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(*mapp)->nsegs = 0;
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(*mapp)->segments = (bus_dma_segment_t *)malloc(
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sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF,
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M_NOWAIT);
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if ((*mapp)->segments == NULL) {
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CTR3(KTR_BUSDMA, "%s: tag %p error %d",
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__func__, dmat, ENOMEM);
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return (ENOMEM);
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}
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if (error == 0)
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dmat->map_count++;
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CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
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__func__, dmat, dmat->flags, error);
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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 (dmat->flags & BUS_DMA_COULD_BOUNCE) {
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if (STAILQ_FIRST(&map->bpages) != NULL) {
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CTR3(KTR_BUSDMA, "%s: tag %p error %d",
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__func__, dmat, EBUSY);
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return (EBUSY);
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}
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if (dmat->bounce_zone)
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dmat->bounce_zone->map_count--;
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}
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free(map->segments, M_DEVBUF);
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free(map, M_DEVBUF);
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dmat->map_count--;
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CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat);
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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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vm_memattr_t attr;
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int mflags;
|
|
|
|
if (flags & BUS_DMA_NOWAIT)
|
|
mflags = M_NOWAIT;
|
|
else
|
|
mflags = M_WAITOK;
|
|
|
|
bus_dmamap_create(dmat, flags, mapp);
|
|
|
|
if (flags & BUS_DMA_ZERO)
|
|
mflags |= M_ZERO;
|
|
#ifdef NOTYET
|
|
if (flags & BUS_DMA_NOCACHE)
|
|
attr = VM_MEMATTR_UNCACHEABLE;
|
|
else
|
|
#endif
|
|
attr = VM_MEMATTR_DEFAULT;
|
|
|
|
/*
|
|
* XXX:
|
|
* (dmat->alignment <= dmat->maxsize) is just a quick hack; the exact
|
|
* alignment guarantees of malloc need to be nailed down, and the
|
|
* code below should be rewritten to take that into account.
|
|
*
|
|
* In the meantime, we'll warn the user if malloc gets it wrong.
|
|
*/
|
|
if ((dmat->maxsize <= PAGE_SIZE) &&
|
|
(dmat->alignment <= dmat->maxsize) &&
|
|
dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem) &&
|
|
attr == VM_MEMATTR_DEFAULT) {
|
|
*vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags);
|
|
} else {
|
|
/*
|
|
* XXX Use Contigmalloc until it is merged into this facility
|
|
* and handles multi-seg allocations. Nobody is doing
|
|
* multi-seg allocations yet though.
|
|
* XXX Certain AGP hardware does.
|
|
*/
|
|
*vaddr = (void *)kmem_alloc_contig(kmem_arena, dmat->maxsize,
|
|
mflags, 0ul, dmat->lowaddr, dmat->alignment ?
|
|
dmat->alignment : 1ul, dmat->boundary, attr);
|
|
(*mapp)->contigalloc = 1;
|
|
}
|
|
if (*vaddr == NULL) {
|
|
CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
|
|
__func__, dmat, dmat->flags, ENOMEM);
|
|
return (ENOMEM);
|
|
} else if (vtophys(*vaddr) & (dmat->alignment - 1)) {
|
|
printf("bus_dmamem_alloc failed to align memory properly.\n");
|
|
}
|
|
CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
|
|
__func__, dmat, dmat->flags, 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a piece of memory and it's allociated dmamap, that was allocated
|
|
* via bus_dmamem_alloc. Make the same choice for free/contigfree.
|
|
*/
|
|
void
|
|
bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
|
|
{
|
|
|
|
if (!map->contigalloc)
|
|
free(vaddr, M_DEVBUF);
|
|
else
|
|
kmem_free(kmem_arena, (vm_offset_t)vaddr, dmat->maxsize);
|
|
bus_dmamap_destroy(dmat, map);
|
|
CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags);
|
|
}
|
|
|
|
static void
|
|
_bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
|
|
bus_size_t buflen, int flags)
|
|
{
|
|
bus_addr_t curaddr;
|
|
bus_size_t sgsize;
|
|
|
|
if (map->pagesneeded == 0) {
|
|
CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, "
|
|
"alignment= %d", dmat->lowaddr, ptoa((vm_paddr_t)Maxmem),
|
|
dmat->boundary, dmat->alignment);
|
|
CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", map, map->pagesneeded);
|
|
/*
|
|
* Count the number of bounce pages
|
|
* needed in order to complete this transfer
|
|
*/
|
|
curaddr = buf;
|
|
while (buflen != 0) {
|
|
sgsize = MIN(buflen, dmat->maxsegsz);
|
|
if (run_filter(dmat, curaddr) != 0) {
|
|
sgsize = MIN(sgsize,
|
|
PAGE_SIZE - (curaddr & PAGE_MASK));
|
|
map->pagesneeded++;
|
|
}
|
|
curaddr += sgsize;
|
|
buflen -= sgsize;
|
|
}
|
|
CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded);
|
|
}
|
|
}
|
|
|
|
static void
|
|
_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap,
|
|
void *buf, bus_size_t buflen, int flags)
|
|
{
|
|
vm_offset_t vaddr;
|
|
vm_offset_t vendaddr;
|
|
bus_addr_t paddr;
|
|
|
|
if (map->pagesneeded == 0) {
|
|
CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, "
|
|
"alignment= %d", dmat->lowaddr, ptoa((vm_paddr_t)Maxmem),
|
|
dmat->boundary, dmat->alignment);
|
|
CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", map, map->pagesneeded);
|
|
/*
|
|
* Count the number of bounce pages
|
|
* needed in order to complete this transfer
|
|
*/
|
|
vaddr = (vm_offset_t)buf;
|
|
vendaddr = (vm_offset_t)buf + buflen;
|
|
|
|
while (vaddr < vendaddr) {
|
|
bus_size_t sg_len;
|
|
|
|
sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK);
|
|
if (pmap == kernel_pmap)
|
|
paddr = pmap_kextract(vaddr);
|
|
else
|
|
paddr = pmap_extract(pmap, vaddr);
|
|
if (run_filter(dmat, paddr) != 0) {
|
|
sg_len = roundup2(sg_len, dmat->alignment);
|
|
map->pagesneeded++;
|
|
}
|
|
vaddr += sg_len;
|
|
}
|
|
CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded);
|
|
}
|
|
}
|
|
|
|
static int
|
|
_bus_dmamap_reserve_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int flags)
|
|
{
|
|
|
|
/* Reserve Necessary Bounce Pages */
|
|
mtx_lock(&bounce_lock);
|
|
if (flags & BUS_DMA_NOWAIT) {
|
|
if (reserve_bounce_pages(dmat, map, 0) != 0) {
|
|
mtx_unlock(&bounce_lock);
|
|
return (ENOMEM);
|
|
}
|
|
} else {
|
|
if (reserve_bounce_pages(dmat, map, 1) != 0) {
|
|
/* Queue us for resources */
|
|
STAILQ_INSERT_TAIL(&bounce_map_waitinglist,
|
|
map, links);
|
|
mtx_unlock(&bounce_lock);
|
|
return (EINPROGRESS);
|
|
}
|
|
}
|
|
mtx_unlock(&bounce_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add a single contiguous physical range to the segment list.
|
|
*/
|
|
static int
|
|
_bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
|
|
bus_size_t sgsize, bus_dma_segment_t *segs, int *segp)
|
|
{
|
|
bus_addr_t baddr, bmask;
|
|
int seg;
|
|
|
|
/*
|
|
* Make sure we don't cross any boundaries.
|
|
*/
|
|
bmask = ~(dmat->boundary - 1);
|
|
if (dmat->boundary > 0) {
|
|
baddr = (curaddr + dmat->boundary) & bmask;
|
|
if (sgsize > (baddr - curaddr))
|
|
sgsize = (baddr - curaddr);
|
|
}
|
|
|
|
/*
|
|
* Insert chunk into a segment, coalescing with
|
|
* previous segment if possible.
|
|
*/
|
|
seg = *segp;
|
|
if (seg == -1) {
|
|
seg = 0;
|
|
segs[seg].ds_addr = curaddr;
|
|
segs[seg].ds_len = sgsize;
|
|
} else {
|
|
if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
|
|
(segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
|
|
(dmat->boundary == 0 ||
|
|
(segs[seg].ds_addr & bmask) == (curaddr & bmask)))
|
|
segs[seg].ds_len += sgsize;
|
|
else {
|
|
if (++seg >= dmat->nsegments)
|
|
return (0);
|
|
segs[seg].ds_addr = curaddr;
|
|
segs[seg].ds_len = sgsize;
|
|
}
|
|
}
|
|
*segp = seg;
|
|
return (sgsize);
|
|
}
|
|
|
|
/*
|
|
* Utility function to load a physical buffer. segp contains
|
|
* the starting segment on entrace, and the ending segment on exit.
|
|
*/
|
|
int
|
|
_bus_dmamap_load_phys(bus_dma_tag_t dmat,
|
|
bus_dmamap_t map,
|
|
vm_paddr_t buf, bus_size_t buflen,
|
|
int flags,
|
|
bus_dma_segment_t *segs,
|
|
int *segp)
|
|
{
|
|
bus_addr_t curaddr;
|
|
bus_size_t sgsize;
|
|
int error;
|
|
|
|
if (segs == NULL)
|
|
segs = map->segments;
|
|
|
|
if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) {
|
|
_bus_dmamap_count_phys(dmat, map, buf, buflen, flags);
|
|
if (map->pagesneeded != 0) {
|
|
error = _bus_dmamap_reserve_pages(dmat, map, flags);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
while (buflen > 0) {
|
|
curaddr = buf;
|
|
sgsize = MIN(buflen, dmat->maxsegsz);
|
|
if (map->pagesneeded != 0 && run_filter(dmat, curaddr)) {
|
|
sgsize = MIN(sgsize, PAGE_SIZE - (curaddr & PAGE_MASK));
|
|
curaddr = add_bounce_page(dmat, map, 0, curaddr,
|
|
sgsize);
|
|
}
|
|
sgsize = _bus_dmamap_addseg(dmat, map, curaddr, sgsize, segs,
|
|
segp);
|
|
if (sgsize == 0)
|
|
break;
|
|
buf += sgsize;
|
|
buflen -= sgsize;
|
|
}
|
|
|
|
/*
|
|
* Did we fit?
|
|
*/
|
|
return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
|
|
}
|
|
|
|
int
|
|
_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map,
|
|
struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
|
|
bus_dma_segment_t *segs, int *segp)
|
|
{
|
|
|
|
return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags,
|
|
segs, segp));
|
|
}
|
|
|
|
/*
|
|
* Utility function to load a linear buffer. segp contains
|
|
* the starting segment on entrance, and the ending segment on exit.
|
|
*/
|
|
int
|
|
_bus_dmamap_load_buffer(bus_dma_tag_t dmat,
|
|
bus_dmamap_t map,
|
|
void *buf, bus_size_t buflen,
|
|
pmap_t pmap,
|
|
int flags,
|
|
bus_dma_segment_t *segs,
|
|
int *segp)
|
|
{
|
|
bus_size_t sgsize;
|
|
bus_addr_t curaddr;
|
|
vm_offset_t kvaddr, vaddr;
|
|
int error;
|
|
|
|
if (segs == NULL)
|
|
segs = map->segments;
|
|
|
|
if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) {
|
|
_bus_dmamap_count_pages(dmat, map, pmap, buf, buflen, flags);
|
|
if (map->pagesneeded != 0) {
|
|
error = _bus_dmamap_reserve_pages(dmat, map, flags);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
vaddr = (vm_offset_t)buf;
|
|
|
|
while (buflen > 0) {
|
|
bus_size_t max_sgsize;
|
|
|
|
/*
|
|
* Get the physical address for this segment.
|
|
*/
|
|
if (pmap == kernel_pmap) {
|
|
curaddr = pmap_kextract(vaddr);
|
|
kvaddr = vaddr;
|
|
} else {
|
|
curaddr = pmap_extract(pmap, vaddr);
|
|
kvaddr = 0;
|
|
}
|
|
|
|
/*
|
|
* Compute the segment size, and adjust counts.
|
|
*/
|
|
max_sgsize = MIN(buflen, dmat->maxsegsz);
|
|
sgsize = PAGE_SIZE - (curaddr & PAGE_MASK);
|
|
if (map->pagesneeded != 0 && run_filter(dmat, curaddr)) {
|
|
sgsize = roundup2(sgsize, dmat->alignment);
|
|
sgsize = MIN(sgsize, max_sgsize);
|
|
curaddr = add_bounce_page(dmat, map, kvaddr, curaddr,
|
|
sgsize);
|
|
} else {
|
|
sgsize = MIN(sgsize, max_sgsize);
|
|
}
|
|
|
|
sgsize = _bus_dmamap_addseg(dmat, map, curaddr, sgsize, segs,
|
|
segp);
|
|
if (sgsize == 0)
|
|
break;
|
|
vaddr += sgsize;
|
|
buflen -= sgsize;
|
|
}
|
|
|
|
/*
|
|
* Did we fit?
|
|
*/
|
|
return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
|
|
}
|
|
|
|
void
|
|
__bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
|
|
struct memdesc *mem, bus_dmamap_callback_t *callback,
|
|
void *callback_arg)
|
|
{
|
|
|
|
if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
|
|
map->dmat = dmat;
|
|
map->mem = *mem;
|
|
map->callback = callback;
|
|
map->callback_arg = callback_arg;
|
|
}
|
|
}
|
|
|
|
bus_dma_segment_t *
|
|
_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
|
|
bus_dma_segment_t *segs, int nsegs, int error)
|
|
{
|
|
|
|
map->nsegs = nsegs;
|
|
if (segs != NULL)
|
|
memcpy(map->segments, segs, map->nsegs*sizeof(segs[0]));
|
|
if (dmat->iommu != NULL)
|
|
IOMMU_MAP(dmat->iommu, map->segments, &map->nsegs,
|
|
dmat->lowaddr, dmat->highaddr, dmat->alignment,
|
|
dmat->boundary, dmat->iommu_cookie);
|
|
|
|
if (segs != NULL)
|
|
memcpy(segs, map->segments, map->nsegs*sizeof(segs[0]));
|
|
else
|
|
segs = map->segments;
|
|
|
|
return (segs);
|
|
}
|
|
|
|
/*
|
|
* Release the mapping held by map.
|
|
*/
|
|
void
|
|
_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
|
|
{
|
|
struct bounce_page *bpage;
|
|
|
|
if (dmat->iommu) {
|
|
IOMMU_UNMAP(dmat->iommu, map->segments, map->nsegs, dmat->iommu_cookie);
|
|
map->nsegs = 0;
|
|
}
|
|
|
|
while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
|
|
STAILQ_REMOVE_HEAD(&map->bpages, links);
|
|
free_bounce_page(dmat, bpage);
|
|
}
|
|
}
|
|
|
|
void
|
|
_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
|
|
{
|
|
struct bounce_page *bpage;
|
|
vm_offset_t datavaddr, tempvaddr;
|
|
|
|
if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
|
|
|
|
/*
|
|
* Handle data bouncing. We might also
|
|
* want to add support for invalidating
|
|
* the caches on broken hardware
|
|
*/
|
|
CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x "
|
|
"performing bounce", __func__, dmat, dmat->flags, op);
|
|
|
|
if (op & BUS_DMASYNC_PREWRITE) {
|
|
while (bpage != NULL) {
|
|
tempvaddr = 0;
|
|
datavaddr = bpage->datavaddr;
|
|
if (datavaddr == 0) {
|
|
tempvaddr = pmap_quick_enter_page(
|
|
bpage->datapage);
|
|
datavaddr = tempvaddr |
|
|
bpage->dataoffs;
|
|
}
|
|
|
|
bcopy((void *)datavaddr,
|
|
(void *)bpage->vaddr, bpage->datacount);
|
|
|
|
if (tempvaddr != 0)
|
|
pmap_quick_remove_page(tempvaddr);
|
|
bpage = STAILQ_NEXT(bpage, links);
|
|
}
|
|
dmat->bounce_zone->total_bounced++;
|
|
}
|
|
|
|
if (op & BUS_DMASYNC_POSTREAD) {
|
|
while (bpage != NULL) {
|
|
tempvaddr = 0;
|
|
datavaddr = bpage->datavaddr;
|
|
if (datavaddr == 0) {
|
|
tempvaddr = pmap_quick_enter_page(
|
|
bpage->datapage);
|
|
datavaddr = tempvaddr |
|
|
bpage->dataoffs;
|
|
}
|
|
|
|
bcopy((void *)bpage->vaddr,
|
|
(void *)datavaddr, bpage->datacount);
|
|
|
|
if (tempvaddr != 0)
|
|
pmap_quick_remove_page(tempvaddr);
|
|
bpage = STAILQ_NEXT(bpage, links);
|
|
}
|
|
dmat->bounce_zone->total_bounced++;
|
|
}
|
|
}
|
|
|
|
powerpc_sync();
|
|
}
|
|
|
|
static void
|
|
init_bounce_pages(void *dummy __unused)
|
|
{
|
|
|
|
total_bpages = 0;
|
|
STAILQ_INIT(&bounce_zone_list);
|
|
STAILQ_INIT(&bounce_map_waitinglist);
|
|
STAILQ_INIT(&bounce_map_callbacklist);
|
|
mtx_init(&bounce_lock, "bounce pages lock", NULL, MTX_DEF);
|
|
}
|
|
SYSINIT(bpages, SI_SUB_LOCK, SI_ORDER_ANY, init_bounce_pages, NULL);
|
|
|
|
static struct sysctl_ctx_list *
|
|
busdma_sysctl_tree(struct bounce_zone *bz)
|
|
{
|
|
return (&bz->sysctl_tree);
|
|
}
|
|
|
|
static struct sysctl_oid *
|
|
busdma_sysctl_tree_top(struct bounce_zone *bz)
|
|
{
|
|
return (bz->sysctl_tree_top);
|
|
}
|
|
|
|
static int
|
|
alloc_bounce_zone(bus_dma_tag_t dmat)
|
|
{
|
|
struct bounce_zone *bz;
|
|
|
|
/* Check to see if we already have a suitable zone */
|
|
STAILQ_FOREACH(bz, &bounce_zone_list, links) {
|
|
if ((dmat->alignment <= bz->alignment)
|
|
&& (dmat->lowaddr >= bz->lowaddr)) {
|
|
dmat->bounce_zone = bz;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF,
|
|
M_NOWAIT | M_ZERO)) == NULL)
|
|
return (ENOMEM);
|
|
|
|
STAILQ_INIT(&bz->bounce_page_list);
|
|
bz->free_bpages = 0;
|
|
bz->reserved_bpages = 0;
|
|
bz->active_bpages = 0;
|
|
bz->lowaddr = dmat->lowaddr;
|
|
bz->alignment = MAX(dmat->alignment, PAGE_SIZE);
|
|
bz->map_count = 0;
|
|
snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount);
|
|
busdma_zonecount++;
|
|
snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr);
|
|
STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links);
|
|
dmat->bounce_zone = bz;
|
|
|
|
sysctl_ctx_init(&bz->sysctl_tree);
|
|
bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree,
|
|
SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid,
|
|
CTLFLAG_RD, 0, "");
|
|
if (bz->sysctl_tree_top == NULL) {
|
|
sysctl_ctx_free(&bz->sysctl_tree);
|
|
return (0); /* XXX error code? */
|
|
}
|
|
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"total_bpages", CTLFLAG_RD, &bz->total_bpages, 0,
|
|
"Total bounce pages");
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"free_bpages", CTLFLAG_RD, &bz->free_bpages, 0,
|
|
"Free bounce pages");
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0,
|
|
"Reserved bounce pages");
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"active_bpages", CTLFLAG_RD, &bz->active_bpages, 0,
|
|
"Active bounce pages");
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"total_bounced", CTLFLAG_RD, &bz->total_bounced, 0,
|
|
"Total bounce requests");
|
|
SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"total_deferred", CTLFLAG_RD, &bz->total_deferred, 0,
|
|
"Total bounce requests that were deferred");
|
|
SYSCTL_ADD_STRING(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, "");
|
|
SYSCTL_ADD_UAUTO(busdma_sysctl_tree(bz),
|
|
SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
|
|
"alignment", CTLFLAG_RD, &bz->alignment, "");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
|
|
{
|
|
struct bounce_zone *bz;
|
|
int count;
|
|
|
|
bz = dmat->bounce_zone;
|
|
count = 0;
|
|
while (numpages > 0) {
|
|
struct bounce_page *bpage;
|
|
|
|
bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF,
|
|
M_NOWAIT | M_ZERO);
|
|
|
|
if (bpage == NULL)
|
|
break;
|
|
bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
|
|
M_NOWAIT, 0ul,
|
|
bz->lowaddr,
|
|
PAGE_SIZE,
|
|
0);
|
|
if (bpage->vaddr == 0) {
|
|
free(bpage, M_DEVBUF);
|
|
break;
|
|
}
|
|
bpage->busaddr = pmap_kextract(bpage->vaddr);
|
|
mtx_lock(&bounce_lock);
|
|
STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links);
|
|
total_bpages++;
|
|
bz->total_bpages++;
|
|
bz->free_bpages++;
|
|
mtx_unlock(&bounce_lock);
|
|
count++;
|
|
numpages--;
|
|
}
|
|
return (count);
|
|
}
|
|
|
|
static int
|
|
reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit)
|
|
{
|
|
struct bounce_zone *bz;
|
|
int pages;
|
|
|
|
mtx_assert(&bounce_lock, MA_OWNED);
|
|
bz = dmat->bounce_zone;
|
|
pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved);
|
|
if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages))
|
|
return (map->pagesneeded - (map->pagesreserved + pages));
|
|
bz->free_bpages -= pages;
|
|
bz->reserved_bpages += pages;
|
|
map->pagesreserved += pages;
|
|
pages = map->pagesneeded - map->pagesreserved;
|
|
|
|
return (pages);
|
|
}
|
|
|
|
static bus_addr_t
|
|
add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
|
|
bus_addr_t addr, bus_size_t size)
|
|
{
|
|
struct bounce_zone *bz;
|
|
struct bounce_page *bpage;
|
|
|
|
KASSERT(dmat->bounce_zone != NULL, ("no bounce zone in dma tag"));
|
|
|
|
bz = dmat->bounce_zone;
|
|
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--;
|
|
|
|
mtx_lock(&bounce_lock);
|
|
bpage = STAILQ_FIRST(&bz->bounce_page_list);
|
|
if (bpage == NULL)
|
|
panic("add_bounce_page: free page list is empty");
|
|
|
|
STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links);
|
|
bz->reserved_bpages--;
|
|
bz->active_bpages++;
|
|
mtx_unlock(&bounce_lock);
|
|
|
|
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
|
|
/* Page offset needs to be preserved. */
|
|
bpage->vaddr |= addr & PAGE_MASK;
|
|
bpage->busaddr |= addr & PAGE_MASK;
|
|
}
|
|
bpage->datavaddr = vaddr;
|
|
bpage->datapage = PHYS_TO_VM_PAGE(addr);
|
|
bpage->dataoffs = addr & PAGE_MASK;
|
|
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)
|
|
{
|
|
struct bus_dmamap *map;
|
|
struct bounce_zone *bz;
|
|
|
|
bz = dmat->bounce_zone;
|
|
bpage->datavaddr = 0;
|
|
bpage->datacount = 0;
|
|
if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
|
|
/*
|
|
* Reset the bounce page to start at offset 0. Other uses
|
|
* of this bounce page may need to store a full page of
|
|
* data and/or assume it starts on a page boundary.
|
|
*/
|
|
bpage->vaddr &= ~PAGE_MASK;
|
|
bpage->busaddr &= ~PAGE_MASK;
|
|
}
|
|
|
|
mtx_lock(&bounce_lock);
|
|
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
|
|
bz->free_bpages++;
|
|
bz->active_bpages--;
|
|
if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) {
|
|
if (reserve_bounce_pages(map->dmat, map, 1) == 0) {
|
|
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
|
|
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
|
|
map, links);
|
|
busdma_swi_pending = 1;
|
|
bz->total_deferred++;
|
|
swi_sched(vm_ih, 0);
|
|
}
|
|
}
|
|
mtx_unlock(&bounce_lock);
|
|
}
|
|
|
|
void
|
|
busdma_swi(void)
|
|
{
|
|
bus_dma_tag_t dmat;
|
|
struct bus_dmamap *map;
|
|
|
|
mtx_lock(&bounce_lock);
|
|
while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) {
|
|
STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links);
|
|
mtx_unlock(&bounce_lock);
|
|
dmat = map->dmat;
|
|
(dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_LOCK);
|
|
bus_dmamap_load_mem(map->dmat, map, &map->mem,
|
|
map->callback, map->callback_arg,
|
|
BUS_DMA_WAITOK);
|
|
(dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_UNLOCK);
|
|
mtx_lock(&bounce_lock);
|
|
}
|
|
mtx_unlock(&bounce_lock);
|
|
}
|
|
|
|
int
|
|
bus_dma_tag_set_iommu(bus_dma_tag_t tag, device_t iommu, void *cookie)
|
|
{
|
|
tag->iommu = iommu;
|
|
tag->iommu_cookie = cookie;
|
|
|
|
return (0);
|
|
}
|
|
|