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author | Scott Long <scottl@FreeBSD.org> | 2003-07-01 15:52:06 +0000 |
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committer | Scott Long <scottl@FreeBSD.org> | 2003-07-01 15:52:06 +0000 |
commit | f6b1c44d1f70d5f298b911f2c1dcd802b0d11339 (patch) | |
tree | 1bbd76935b6d5917753df7328c69bd2f3c75f15a /sys/dev/aic7xxx/ahd_pci.c | |
parent | dfebdcdf7ca22f2767534b7df4b828f55b6e754f (diff) | |
download | src-f6b1c44d1f70d5f298b911f2c1dcd802b0d11339.tar.gz src-f6b1c44d1f70d5f298b911f2c1dcd802b0d11339.zip |
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
Notes
Notes:
svn path=/head/; revision=117126
Diffstat (limited to 'sys/dev/aic7xxx/ahd_pci.c')
-rw-r--r-- | sys/dev/aic7xxx/ahd_pci.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/dev/aic7xxx/ahd_pci.c b/sys/dev/aic7xxx/ahd_pci.c index 2f1c8ed26d45..9f7a1b5272c8 100644 --- a/sys/dev/aic7xxx/ahd_pci.c +++ b/sys/dev/aic7xxx/ahd_pci.c @@ -28,7 +28,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: //depot/aic7xxx/freebsd/dev/aic7xxx/ahd_pci.c#13 $ + * $Id: ahd_pci.c,v 1.8 2003/05/03 23:27:57 gibbs Exp $ * * $FreeBSD$ */ @@ -123,6 +123,8 @@ ahd_pci_attach(device_t dev) /*nsegments*/AHD_NSEG, /*maxsegsz*/AHD_MAXTRANSFER_SIZE, /*flags*/0, + /*lockfunc*/busdma_lock_mutex, + /*lockarg*/&Giant, &ahd->parent_dmat); if (error != 0) { |