From 4d495abb9d6f6e6d703264c4133ce1f0c4e7df92 Mon Sep 17 00:00:00 2001 From: scottl Date: Tue, 1 Jul 2003 15:52:06 +0000 Subject: 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 --- sys/dev/dpt/dpt_isa.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'sys/dev/dpt/dpt_isa.c') diff --git a/sys/dev/dpt/dpt_isa.c b/sys/dev/dpt/dpt_isa.c index 708bb69..183b9fb 100644 --- a/sys/dev/dpt/dpt_isa.c +++ b/sys/dev/dpt/dpt_isa.c @@ -189,6 +189,8 @@ dpt_isa_attach (device_t dev) /* nsegments */ ~0, /* maxsegsz */ BUS_SPACE_MAXSIZE_32BIT, /* flags */ 0, + /* lockfunc */ busdma_lock_mutex, + /* lockarg */ &Giant, &dpt->parent_dmat) != 0) { error = ENXIO; goto bad; -- cgit v1.1