freebsd-dev/sys/dev/amr
Scott Long f6b1c44d1f 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
2003-07-01 15:52:06 +00:00
..
amr_cam.c Merge common XPT_CALC_GEOMETRY functions into a single convenience function. 2003-06-14 22:17:41 +00:00
amr_compat.h Centralize the devstat handling for all GEOM disk device drivers 2003-03-08 08:01:31 +00:00
amr_disk.c Use bioq_flush() to drain a bio queue with a specific error code. 2003-04-01 15:06:26 +00:00
amr_pci.c Mega busdma API commit. 2003-07-01 15:52:06 +00:00
amr_tables.h amr.c, 2002-10-30 22:00:11 +00:00
amr.c Use bioq_flush() to drain a bio queue with a specific error code. 2003-04-01 15:06:26 +00:00
amrio.h amr.c, 2002-10-30 22:00:11 +00:00
amrreg.h amr.c, 2002-10-30 22:00:11 +00:00
amrvar.h Use bioq_flush() to drain a bio queue with a specific error code. 2003-04-01 15:06:26 +00:00