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author | scottl <scottl@FreeBSD.org> | 2003-07-01 15:52:06 +0000 |
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committer | scottl <scottl@FreeBSD.org> | 2003-07-01 15:52:06 +0000 |
commit | 4d495abb9d6f6e6d703264c4133ce1f0c4e7df92 (patch) | |
tree | 1bbd76935b6d5917753df7328c69bd2f3c75f15a /sys/dev/sound/pci/t4dwave.c | |
parent | 40bbdc533036dcf851a5b4c44f1b64b82b887a5a (diff) | |
download | FreeBSD-src-4d495abb9d6f6e6d703264c4133ce1f0c4e7df92.zip FreeBSD-src-4d495abb9d6f6e6d703264c4133ce1f0c4e7df92.tar.gz |
Mega busdma API commit.
Add two new arguments to bus_dma_tag_create(): lockfunc and lockfuncarg.
Lockfunc allows a driver to provide a function for managing its locking
semantics while using busdma. At the moment, this is used for the
asynchronous busdma_swi and callback mechanism. Two lockfunc implementations
are provided: busdma_lock_mutex() performs standard mutex operations on the
mutex that is specified from lockfuncarg. dftl_lock() is a panic
implementation and is defaulted to when NULL, NULL are passed to
bus_dma_tag_create(). The only time that NULL, NULL should ever be used is
when the driver ensures that bus_dmamap_load() will not be deferred.
Drivers that do not provide their own locking can pass
busdma_lock_mutex,&Giant args in order to preserve the former behaviour.
sparc64 and powerpc do not provide real busdma_swi functions, so this is
largely a noop on those platforms. The busdma_swi on is64 is not properly
locked yet, so warnings will be emitted on this platform when busdma
callback deferrals happen.
If anyone gets panics or warnings from dflt_lock() being called, please
let me know right away.
Reviewed by: tmm, gibbs
Diffstat (limited to 'sys/dev/sound/pci/t4dwave.c')
-rw-r--r-- | sys/dev/sound/pci/t4dwave.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/dev/sound/pci/t4dwave.c b/sys/dev/sound/pci/t4dwave.c index cd7de77..19a92dc 100644 --- a/sys/dev/sound/pci/t4dwave.c +++ b/sys/dev/sound/pci/t4dwave.c @@ -854,7 +854,8 @@ tr_pci_attach(device_t dev) /*highaddr*/BUS_SPACE_MAXADDR, /*filter*/NULL, /*filterarg*/NULL, /*maxsize*/tr->bufsz, /*nsegments*/1, /*maxsegz*/0x3ffff, - /*flags*/0, &tr->parent_dmat) != 0) { + /*flags*/0, /*lockfunc*/busdma_lock_mutex, + /*lockarg*/&Giant, &tr->parent_dmat) != 0) { device_printf(dev, "unable to create dma tag\n"); goto bad; } |