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qxl: replace pipe signaling with bottom half 

qxl creates a pipe, then writes something to it to wake up the iothread
from the spice server thread to raise an irq.  These days qemu bottom
halves can be scheduled from threads and signals, so there is no reason
to do this any more.  Time to clean it up.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-10-29 13:29:43 +01:00
parent a126050a10
commit 4a46c99c81
2 changed files with 4 additions and 32 deletions
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33
hw/display/qxl.c
View File

@ -1701,15 +1701,9 @@ static const MemoryRegionOps qxl_io_ops = {
},
};
static void pipe_read(void *opaque)
static void qxl_update_irq_bh(void *opaque)
{
PCIQXLDevice *d = opaque;
char dummy;
int len;
do {
len = read(d->pipe[0], &dummy, sizeof(dummy));
} while (len == sizeof(dummy));
qxl_update_irq(d);
}
@ -1730,28 +1724,7 @@ static void qxl_send_events(PCIQXLDevice *d, uint32_t events)
if ((old_pending & le_events) == le_events) {
return;
}
if (qemu_thread_is_self(&d->main)) {
qxl_update_irq(d);
} else {
if (write(d->pipe[1], d, 1) != 1) {
dprint(d, 1, "%s: write to pipe failed\n", __func__);
}
}
}
static void init_pipe_signaling(PCIQXLDevice *d)
{
if (pipe(d->pipe) < 0) {
fprintf(stderr, "%s:%s: qxl pipe creation failed\n",
__FILE__, __func__);
exit(1);
}
fcntl(d->pipe[0], F_SETFL, O_NONBLOCK);
fcntl(d->pipe[1], F_SETFL, O_NONBLOCK);
fcntl(d->pipe[0], F_SETOWN, getpid());
qemu_thread_get_self(&d->main);
qemu_set_fd_handler(d->pipe[0], pipe_read, NULL, d);
qemu_bh_schedule(d->update_irq);
}
/* graphics console */
@ -2044,7 +2017,7 @@ static int qxl_init_common(PCIQXLDevice *qxl)
}
qemu_add_vm_change_state_handler(qxl_vm_change_state_handler, qxl);
init_pipe_signaling(qxl);
qxl->update_irq = qemu_bh_new(qxl_update_irq_bh, qxl);
qxl_reset_state(qxl);
qxl->update_area_bh = qemu_bh_new(qxl_render_update_area_bh, qxl);

3
hw/display/qxl.h
View File

@ -81,8 +81,7 @@ typedef struct PCIQXLDevice {
QemuMutex track_lock;
/* thread signaling */
QemuThread main;
int pipe[2];
QEMUBH *update_irq;
/* ram pci bar */
QXLRam *ram;