f6b1c44d1f
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 |
||
|---|---|---|
| .. | ||
| _inttypes.h | ||
| _limits.h | ||
| _stdint.h | ||
| _types.h | ||
| asm.h | ||
| atomic.h | ||
| bat.h | ||
| bootinfo.h | ||
| bus_memio.h | ||
| bus_pio.h | ||
| bus.h | ||
| clock.h | ||
| cpu.h | ||
| cpufunc.h | ||
| critical.h | ||
| db_machdep.h | ||
| elf.h | ||
| endian.h | ||
| exec.h | ||
| float.h | ||
| fpu.h | ||
| frame.h | ||
| hid.h | ||
| ieee.h | ||
| ieeefp.h | ||
| in_cksum.h | ||
| interruptvar.h | ||
| intr_machdep.h | ||
| intr.h | ||
| ipl.h | ||
| kse.h | ||
| limits.h | ||
| md_var.h | ||
| metadata.h | ||
| mutex.h | ||
| nexusvar.h | ||
| ofw_machdep.h | ||
| openpicreg.h | ||
| openpicvar.h | ||
| param.h | ||
| pcb.h | ||
| pcpu.h | ||
| pio.h | ||
| pmap.h | ||
| powerpc.h | ||
| proc.h | ||
| profile.h | ||
| psl.h | ||
| pte.h | ||
| ptrace.h | ||
| reg.h | ||
| reloc.h | ||
| resource.h | ||
| runq.h | ||
| setjmp.h | ||
| sigframe.h | ||
| signal.h | ||
| smp.h | ||
| spr.h | ||
| sr.h | ||
| stdarg.h | ||
| trap.h | ||
| ucontext.h | ||
| varargs.h | ||
| vmparam.h | ||