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Add bus_dmamap_load_ma() function to load map with the array of

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vm_pages.  Provide trivial implementation which forwards the load to
_bus_dmamap_load_phys() page by page.  Right now all architectures use
bus_dmamap_load_ma_triv().

Tested by:	pho (as part of the functional patch)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
This commit is contained in:
kib 2013-10-27 21:39:16 +00:00
parent 5449e20fb6
commit 79afbd5fdd
9 changed files with 94 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sys/arm/arm/busdma_machdep-v6.c
View File

@ -975,6 +975,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat,
return (0);
}
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 entrace, and the ending segment on exit.

11
sys/arm/arm/busdma_machdep.c
View File

@ -992,6 +992,17 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
}
return (0);
}
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.

11
sys/ia64/ia64/busdma_machdep.c
View File

@ -658,6 +658,17 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
*/
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 entrace, and the ending segment on exit.

25
sys/kern/subr_bus_dma.c
View File

@ -124,24 +124,33 @@ static int
_bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
int *nsegs, int flags)
{
vm_paddr_t paddr;
bus_size_t len, tlen;
int error, i, ma_offs;
int error;
if ((bio->bio_flags & BIO_UNMAPPED) == 0) {
error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data,
bio->bio_bcount, kernel_pmap, flags, NULL, nsegs);
return (error);
} else {
error = _bus_dmamap_load_ma(dmat, map, bio->bio_ma,
bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs);
}
return (error);
}
int
bus_dmamap_load_ma_triv(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)
{
vm_paddr_t paddr;
bus_size_t len;
int error, i;
error = 0;
tlen = bio->bio_bcount;
ma_offs = bio->bio_ma_offset;
for (i = 0; tlen > 0; i++, tlen -= len) {
len = min(PAGE_SIZE - ma_offs, tlen);
paddr = VM_PAGE_TO_PHYS(bio->bio_ma[i]) + ma_offs;
paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
error = _bus_dmamap_load_phys(dmat, map, paddr, len,
flags, NULL, nsegs);
flags, segs, segp);
if (error != 0)
break;
ma_offs = 0;

10
sys/mips/mips/busdma_machdep.c
View File

@ -878,6 +878,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
return (0);
}
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.

10
sys/powerpc/powerpc/busdma_machdep.c
View File

@ -754,6 +754,16 @@ _bus_dmamap_load_phys(bus_dma_tag_t dmat,
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.

2
sys/sparc64/include/bus_dma.h
View File

@ -146,5 +146,7 @@ struct bus_dma_tag {
((t)->dt_mt->dm_dmamem_alloc((t), (v), (f), (m)))
#define bus_dmamem_free(t, v, m) \
((t)->dt_mt->dm_dmamem_free((t), (v), (m)))
#define _bus_dmamap_load_ma(t, m, a, tt, o, f, s, p) \
bus_dmamap_load_ma_triv((t), (m), (a), (tt), (o), (f), (s), (p))
#endif /* !_SPARC64_BUS_DMA_H_ */

13
sys/sys/bus_dma.h
View File

@ -246,6 +246,15 @@ int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem, bus_dmamap_callback_t *callback,
void *callback_arg, int flags);
/*
* Placeholder for use by busdma implementations which do not benefit
* from optimized procedure to load an array of vm_page_t. Falls back
* to do _bus_dmamap_load_phys() in loop.
*/
int bus_dmamap_load_ma_triv(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);
/*
* XXX sparc64 uses the same interface, but a much different implementation.
* <machine/bus_dma.h> for the sparc64 arch contains the equivalent
@ -324,6 +333,10 @@ int _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map,
vm_paddr_t paddr, bus_size_t buflen,
int flags, bus_dma_segment_t *segs, int *segp);
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);
bus_dma_segment_t *_bus_dmamap_complete(bus_dma_tag_t dmat,
bus_dmamap_t map,
bus_dma_segment_t *segs,

10
sys/x86/x86/busdma_machdep.c
View File

@ -849,6 +849,16 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
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));
}
void
__bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
struct memdesc *mem, bus_dmamap_callback_t *callback,