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![]() When a DMA request using bounce pages completes, a swi is triggered to schedule pending DMA requests using the just-freed bounce pages. For a long time this bus_dma swi has been tied to a "virtual memory" swi (swi_vm). However, all of the swi_vm implementations are the same and consist of checking a flag (busdma_swi_pending) which is always true and if set calling busdma_swi. I suspect this dates back to the pre-SMPng days and that the intention was for swi_vm to serve as a mux. However, in the current scheme there's no need for the mux. Instead, remove swi_vm and vm_ih. Each bus_dma implementation that uses bounce pages is responsible for creating its own swi (busdma_ih) which it now schedules directly. This swi invokes busdma_swi directly removing the need for busdma_swi_pending. One consequence is that the swi now works on RISC-V which had previously failed to invoke busdma_swi from swi_vm. Reviewed by: imp, kib Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D33447 |
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.. | ||
_align.h | ||
_bus.h | ||
_inttypes.h | ||
_limits.h | ||
_stdint.h | ||
_types.h | ||
altivec.h | ||
asm.h | ||
atomic.h | ||
bat.h | ||
bus.h | ||
bus_dma.h | ||
clock.h | ||
counter.h | ||
cpu.h | ||
cpufunc.h | ||
db_machdep.h | ||
dbdma.h | ||
dump.h | ||
efi.h | ||
elf.h | ||
endian.h | ||
exec.h | ||
float.h | ||
floatingpoint.h | ||
fpu.h | ||
frame.h | ||
gdb_machdep.h | ||
hid.h | ||
ieee.h | ||
ieeefp.h | ||
ifunc.h | ||
in_cksum.h | ||
intr_machdep.h | ||
kdb.h | ||
limits.h | ||
machdep.h | ||
md_var.h | ||
memdev.h | ||
metadata.h | ||
minidump.h | ||
mmuvar.h | ||
ofw_machdep.h | ||
openpicreg.h | ||
openpicvar.h | ||
param.h | ||
pcb.h | ||
pcpu.h | ||
pcpu_aux.h | ||
pio.h | ||
platform.h | ||
platformvar.h | ||
pmap.h | ||
pmc_mdep.h | ||
proc.h | ||
procctl.h | ||
profile.h | ||
psl.h | ||
pte.h | ||
ptrace.h | ||
reg.h | ||
reloc.h | ||
resource.h | ||
rtas.h | ||
runq.h | ||
sc_machdep.h | ||
setjmp.h | ||
sigframe.h | ||
signal.h | ||
slb.h | ||
smp.h | ||
spr.h | ||
sr.h | ||
stack.h | ||
stdarg.h | ||
sysarch.h | ||
tlb.h | ||
tls.h | ||
trap.h | ||
ucontext.h | ||
vdso.h | ||
vm.h | ||
vmparam.h |