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[src/trunk]: src/sys/arch/mips/mips When decide to coalesce segments, if the ...
details: https://anonhg.NetBSD.org/src/rev/9c4b9a5bd59a
branches: trunk
changeset: 789583:9c4b9a5bd59a
user: matt <matt%NetBSD.org@localhost>
date: Fri Aug 23 07:15:08 2013 +0000
description:
When decide to coalesce segments, if the d_cache isn't coherent also make
sure the VA is contiguous as well.
diffstat:
sys/arch/mips/mips/bus_dma.c | 109 +++++++++++++++++++++---------------------
1 files changed, 55 insertions(+), 54 deletions(-)
diffs (247 lines):
diff -r bda8abb7fa18 -r 9c4b9a5bd59a sys/arch/mips/mips/bus_dma.c
--- a/sys/arch/mips/mips/bus_dma.c Fri Aug 23 06:31:49 2013 +0000
+++ b/sys/arch/mips/mips/bus_dma.c Fri Aug 23 07:15:08 2013 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: bus_dma.c,v 1.27 2011/07/10 23:13:22 matt Exp $ */
+/* $NetBSD: bus_dma.c,v 1.28 2013/08/23 07:15:08 matt Exp $ */
/*-
* Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
-__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.27 2011/07/10 23:13:22 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.28 2013/08/23 07:15:08 matt Exp $");
#define _MIPS_BUS_DMA_PRIVATE
@@ -97,26 +97,29 @@
paddr_t kvtophys(vaddr_t); /* XXX */
/*
- * Utility function to load a linear buffer. lastaddrp holds state
- * between invocations (for multiple-buffer loads). segp contains
- * the starting segment on entrance, and the ending segment on exit.
- * first indicates if this is the first invocation of this function.
+ * Utility function to load a linear buffer. segp contains the starting
+ * segment on entrance, and the ending segment on exit. first indicates
+ * if this is the first invocation of this function.
*/
static int
_bus_dmamap_load_buffer(bus_dma_tag_t t, bus_dmamap_t map,
void *buf, bus_size_t buflen, struct vmspace *vm, int flags,
- paddr_t *lastaddrp, int *segp, int first)
+ int *segp, bool first)
{
bus_size_t sgsize;
- bus_size_t bmask;
paddr_t baddr, curaddr, lastaddr;
- vaddr_t vaddr = (vaddr_t)buf;
- int seg;
+ vaddr_t vaddr = (vaddr_t)buf, lastvaddr;
+ int seg = *segp;
+ bus_dma_segment_t *ds = &map->dm_segs[seg];
+ bus_dma_segment_t * const eds = &map->dm_segs[map->_dm_segcnt];
+ const bool d_cache_coherent =
+ (mips_options.mips_cpu_flags & CPU_MIPS_D_CACHE_COHERENT) != 0;
- lastaddr = *lastaddrp;
- bmask = ~(map->_dm_boundary - 1);
+ lastaddr = ds->ds_addr + ds->ds_len;
+ lastvaddr = ds->_ds_vaddr + ds->ds_len;
+ const bus_size_t bmask = ~(map->_dm_boundary - 1);
- for (seg = *segp; buflen > 0 ; ) {
+ while (buflen > 0) {
/*
* Get the physical address for this segment.
*/
@@ -130,9 +133,9 @@
* If we're beyond the current DMA window, indicate
* that and try to fall back onto something else.
*/
- if (curaddr < t->_bounce_alloc_lo ||
- (t->_bounce_alloc_hi != 0
- && curaddr >= t->_bounce_alloc_hi))
+ if (curaddr < t->_bounce_alloc_lo
+ || (t->_bounce_alloc_hi != 0
+ && curaddr >= t->_bounce_alloc_hi))
return (EINVAL);
#if BUS_DMA_DEBUG
printf("dma: addr %#"PRIxPADDR" -> %#"PRIxPADDR"\n", curaddr,
@@ -144,18 +147,21 @@
* Compute the segment size, and adjust counts.
*/
sgsize = PAGE_SIZE - ((uintptr_t)vaddr & PGOFSET);
- if (buflen < sgsize)
+ if (sgsize > buflen) {
sgsize = buflen;
- if (map->dm_maxsegsz < sgsize)
+ }
+ if (sgsize > map->dm_maxsegsz) {
sgsize = map->dm_maxsegsz;
+ }
/*
* Make sure we don't cross any boundaries.
*/
if (map->_dm_boundary > 0) {
baddr = (curaddr + map->_dm_boundary) & bmask;
- if (sgsize > (baddr - curaddr))
- sgsize = (baddr - curaddr);
+ if (sgsize > baddr - curaddr) {
+ sgsize = baddr - curaddr;
+ }
}
/*
@@ -163,34 +169,31 @@
* the previous segment if possible.
*/
if (first) {
- map->dm_segs[seg].ds_addr = curaddr;
- map->dm_segs[seg].ds_len = sgsize;
- map->dm_segs[seg]._ds_vaddr = vaddr;
- first = 0;
+ ds->ds_addr = curaddr;
+ ds->ds_len = sgsize;
+ ds->_ds_vaddr = vaddr;
+ first = false;
+ } else if (curaddr == lastaddr
+ && (d_cache_coherent || lastvaddr == vaddr)
+ && ds->ds_len + sgsize <= map->dm_maxsegsz
+ && (map->_dm_boundary == 0
+ || ((ds->ds_addr ^ curaddr) & bmask) == 0)) {
+ ds->ds_len += sgsize;
} else {
- if (curaddr == lastaddr &&
- (map->dm_segs[seg].ds_len + sgsize) <=
- map->dm_maxsegsz &&
- (map->_dm_boundary == 0 ||
- (map->dm_segs[seg].ds_addr & bmask) ==
- (curaddr & bmask)))
- map->dm_segs[seg].ds_len += sgsize;
- else {
- if (++seg >= map->_dm_segcnt)
- break;
- map->dm_segs[seg].ds_addr = curaddr;
- map->dm_segs[seg].ds_len = sgsize;
- map->dm_segs[seg]._ds_vaddr = vaddr;
- }
+ if (++ds >= eds)
+ break;
+ ds->ds_addr = curaddr;
+ ds->ds_len = sgsize;
+ ds->_ds_vaddr = vaddr;
}
lastaddr = curaddr + sgsize;
vaddr += sgsize;
buflen -= sgsize;
+ lastvaddr = vaddr;
}
- *segp = seg;
- *lastaddrp = lastaddr;
+ *segp = ds - map->dm_segs;
/*
* Did we fit?
@@ -219,7 +222,6 @@
{
struct mips_bus_dma_cookie * const cookie = map->_dm_cookie;
struct vmspace * const vm = vmspace_kernel();
- paddr_t lastaddr;
int seg, error;
KASSERT(cookie != NULL);
@@ -243,7 +245,7 @@
cookie->id_buftype = buftype;
seg = 0;
error = _bus_dmamap_load_buffer(t, map, cookie->id_bouncebuf,
- buflen, vm, flags, &lastaddr, &seg, 1);
+ buflen, vm, flags, &seg, true);
if (error)
return (error);
@@ -400,7 +402,6 @@
_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
- paddr_t lastaddr;
int seg, error;
struct vmspace *vm;
@@ -435,7 +436,7 @@
seg = 0;
error = _bus_dmamap_load_buffer(t, map, buf, buflen,
- vm, flags, &lastaddr, &seg, 1);
+ vm, flags, &seg, true);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
@@ -477,10 +478,10 @@
_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
struct mbuf *m0, int flags)
{
- paddr_t lastaddr;
- int seg, error, first;
+ int seg, error;
struct mbuf *m;
struct vmspace * vm = vmspace_kernel();
+ bool first;
if (map->dm_nsegs > 0) {
#ifdef _MIPS_NEED_BUS_DMA_BOUNCE
@@ -510,15 +511,15 @@
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
- first = 1;
+ first = true;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len == 0)
continue;
error = _bus_dmamap_load_buffer(t, map, m->m_data, m->m_len,
- vm, flags, &lastaddr, &seg, first);
- first = 0;
+ vm, flags, &seg, first);
+ first = false;
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
@@ -548,8 +549,8 @@
_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map,
struct uio *uio, int flags)
{
- paddr_t lastaddr;
- int seg, i, error, first;
+ int seg, i, error;
+ bool first;
bus_size_t minlen, resid;
struct iovec *iov;
void *addr;
@@ -577,7 +578,7 @@
resid = uio->uio_resid;
iov = uio->uio_iov;
- first = 1;
+ first = true;
seg = 0;
error = 0;
for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0; i++) {
@@ -589,8 +590,8 @@
addr = (void *)iov[i].iov_base;
error = _bus_dmamap_load_buffer(t, map, addr, minlen,
- uio->uio_vmspace, flags, &lastaddr, &seg, first);
- first = 0;
+ uio->uio_vmspace, flags, &seg, first);
+ first = false;
resid -= minlen;
}
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