If vmsvga supports interrupts (SVGA_CAP_IRQMASK), some guests wait for
FIFO to become not full by sleeping until FIFO_PROGRESS interrupt occurs.
This is the most efficient thing to do when the FIFO fills up.
To support these guests, add support for SVGA_IRQFLAG_FIFO_PROGRESS.
See usage example by guest in VMware SVGA development kit
SVGAFIFOFull().
Reviewed-by: Darren Kenny <darren.ke...@oracle.com>
Signed-off-by: Liran Alon <liran.a...@oracle.com>
---
hw/display/vmware_vga.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index 597051ec5c92..dc5f4681f0d3 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -731,6 +731,7 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
uint32_t cmd_start;
bool cmd_ignored;
bool irq_pending = false;
+ bool fifo_progress = false;
len = vmsvga_fifo_length(s);
while (len > 0 && --maxloop > 0) {
@@ -930,6 +931,15 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
s->fifo[SVGA_FIFO_STOP] = cpu_to_le32(s->fifo_stop);
break;
}
+
+ if (s->fifo_stop != cmd_start)
+ fifo_progress = true;
+ }
+
+ if ((s->irq_mask & SVGA_IRQFLAG_FIFO_PROGRESS) &&
+ fifo_progress) {
+ s->irq_status |= SVGA_IRQFLAG_FIFO_PROGRESS;
+ irq_pending = true;
}
s->syncing = 0;
--
1.9.1
