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Introduce bus_dmamap_load_mbuf_sg(). Instead of taking a callback arg, this

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cuts to the chase and fills in a provided s/g list.  This is meant to optimize
out the cost of the callback since the callback doesn't serve much purpose for
mbufs since mbuf loads will never be deferred.  This is just for amd64 and
i386 at the moment, other arches will be coming shortly.
This commit is contained in:
Scott Long 2005-01-07 07:57:18 +00:00
parent 9cd59edc6b
commit e015dfcfd1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=139840
5 changed files with 111 additions and 26 deletions
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61
sys/amd64/amd64/busdma_machdep.c
View file

@ -562,10 +562,10 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
pmap_t pmap,
int flags,
bus_addr_t *lastaddrp,
bus_dma_segment_t *segs,
int *segp,
int first)
{
bus_dma_segment_t *segs;
bus_size_t sgsize;
bus_addr_t curaddr, lastaddr, baddr, bmask;
vm_offset_t vaddr;
@ -573,8 +573,6 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
int needbounce = 0;
int seg;
segs = dmat->segments;
if (map == NULL)
map = &nobounce_dmamap;
@ -714,7 +712,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
}
error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, NULL, flags,
&lastaddr, &nsegs, 1);
&lastaddr, dmat->segments, &nsegs, 1);
if (error == EINPROGRESS) {
CTR3(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x "
@ -727,8 +725,8 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
else
(*callback)(callback_arg, dmat->segments, nsegs + 1, 0);
CTR2(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x error 0",
dmat, dmat->flags);
CTR3(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x error 0 "
"nsegs %d", dmat, dmat->flags, nsegs + 1);
return (0);
}
@ -759,7 +757,7 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
error = _bus_dmamap_load_buffer(dmat, map,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
&nsegs, first);
dmat->segments, &nsegs, first);
first = 0;
}
}
@ -774,8 +772,45 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
(*callback)(callback_arg, dmat->segments,
nsegs+1, m0->m_pkthdr.len, error);
}
CTR3(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d", dmat, dmat->flags, error);
CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1);
return (error);
}
int
bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs,
int flags)
{
int error;
M_ASSERTPKTHDR(m0);
flags |= BUS_DMA_NOWAIT;
*nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = _bus_dmamap_load_buffer(dmat, map,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
segs, nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
/* XXX FIXME: Having to increment nsegs is really annoying */
++*nsegs;
CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, *nsegs);
return (error);
}
@ -819,8 +854,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
if (minlen > 0) {
error = _bus_dmamap_load_buffer(dmat, map,
addr, minlen,
pmap, flags, &lastaddr, &nsegs, first);
addr, minlen, pmap, flags, &lastaddr,
dmat->segments, &nsegs, first);
first = 0;
resid -= minlen;
@ -834,8 +869,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
(*callback)(callback_arg, dmat->segments,
nsegs+1, uio->uio_resid, error);
}
CTR3(KTR_BUSDMA, "bus_dmamap_load_uio: tag %p tag flags 0x%x "
"error %d", dmat, dmat->flags, error);
CTR4(KTR_BUSDMA, "bus_dmamap_load_uio: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1);
return (error);
}

5
sys/amd64/include/bus_dma.h
View file

@ -230,6 +230,11 @@ int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf, bus_dma_segment_t *segs,
int *nsegs, int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.

61
sys/i386/i386/busdma_machdep.c
View file

@ -562,10 +562,10 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
pmap_t pmap,
int flags,
bus_addr_t *lastaddrp,
bus_dma_segment_t *segs,
int *segp,
int first)
{
bus_dma_segment_t *segs;
bus_size_t sgsize;
bus_addr_t curaddr, lastaddr, baddr, bmask;
vm_offset_t vaddr;
@ -573,8 +573,6 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
int needbounce = 0;
int seg;
segs = dmat->segments;
if (map == NULL)
map = &nobounce_dmamap;
@ -714,7 +712,7 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
}
error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, NULL, flags,
&lastaddr, &nsegs, 1);
&lastaddr, dmat->segments, &nsegs, 1);
if (error == EINPROGRESS) {
CTR3(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x "
@ -727,8 +725,8 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
else
(*callback)(callback_arg, dmat->segments, nsegs + 1, 0);
CTR2(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x error 0",
dmat, dmat->flags);
CTR3(KTR_BUSDMA, "bus_dmamap_load: tag %p tag flags 0x%x error 0 "
"nsegs %d", dmat, dmat->flags, nsegs + 1);
return (0);
}
@ -759,7 +757,7 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
error = _bus_dmamap_load_buffer(dmat, map,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
&nsegs, first);
dmat->segments, &nsegs, first);
first = 0;
}
}
@ -774,8 +772,45 @@ bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
(*callback)(callback_arg, dmat->segments,
nsegs+1, m0->m_pkthdr.len, error);
}
CTR3(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d", dmat, dmat->flags, error);
CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1);
return (error);
}
int
bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs,
int flags)
{
int error;
M_ASSERTPKTHDR(m0);
flags |= BUS_DMA_NOWAIT;
*nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = _bus_dmamap_load_buffer(dmat, map,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
segs, nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
/* XXX FIXME: Having to increment nsegs is really annoying */
++*nsegs;
CTR4(KTR_BUSDMA, "bus_dmamap_load_mbuf: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, *nsegs);
return (error);
}
@ -819,8 +854,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
if (minlen > 0) {
error = _bus_dmamap_load_buffer(dmat, map,
addr, minlen,
pmap, flags, &lastaddr, &nsegs, first);
addr, minlen, pmap, flags, &lastaddr,
dmat->segments, &nsegs, first);
first = 0;
resid -= minlen;
@ -834,8 +869,8 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
(*callback)(callback_arg, dmat->segments,
nsegs+1, uio->uio_resid, error);
}
CTR3(KTR_BUSDMA, "bus_dmamap_load_uio: tag %p tag flags 0x%x "
"error %d", dmat, dmat->flags, error);
CTR4(KTR_BUSDMA, "bus_dmamap_load_uio: tag %p tag flags 0x%x "
"error %d nsegs %d", dmat, dmat->flags, error, nsegs + 1);
return (error);
}

5
sys/i386/include/bus_dma.h
View file

@ -230,6 +230,11 @@ int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf, bus_dma_segment_t *segs,
int *nsegs, int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.

5
sys/sys/bus_dma.h
View file

@ -230,6 +230,11 @@ int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf, bus_dma_segment_t *segs,
int *nsegs, int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.