diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-02-16 14:08:22 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-09-09 15:34:53 +0200 |
| commit | 19d2b5e6ff7202c2bf45c547efa85ae6c2d76bbd (patch) | |
| tree | 84d9d315b0307a886ee6df399c2450caf790bd23 /include/hw/isa | |
| parent | 5f5b5942d56a138baad0ae01458d5d0e62d5be68 (diff) | |
i8257: rewrite DMA_schedule to avoid hooking into the CPU loop
The i8257 DMA controller uses an idle bottom half, which by default
does not cause the main loop to exit. Therefore, the DMA_schedule
function is there to ensure that the CPU relinquishes the iothread
mutex to the iothread.
However, this is not enough since the iothread will call
aio_compute_timeout() and go to sleep again. In the iothread
world, forcing execution of the idle bottom half is much simpler,
and only requires a call to qemu_notify_event(). Do it, removing
the need for the "cpu_request_exit" pseudo-irq. The next patch
will remove it.
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/hw/isa')
| -rw-r--r-- | include/hw/isa/isa.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h index f21ceaafc6..81b94ea264 100644 --- a/include/hw/isa/isa.h +++ b/include/hw/isa/isa.h @@ -112,7 +112,7 @@ int DMA_read_memory (int nchan, void *buf, int pos, int size); int DMA_write_memory (int nchan, void *buf, int pos, int size); void DMA_hold_DREQ (int nchan); void DMA_release_DREQ (int nchan); -void DMA_schedule(int nchan); +void DMA_schedule(void); void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit); void DMA_register_channel (int nchan, DMA_transfer_handler transfer_handler, |