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vfio/display: delay link up event

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Kick the display link up event with a 0.1 sec delay,
so the guest has a chance to notice the link down first.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
[update for redefined macro]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Gerd Hoffmann 2019-03-11 11:14:40 -06:00 • committed by Alex Williamson
parent c62a0c7ce3
commit 8781c70144
2 changed files with 26 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

30
hw/vfio/display.c
View file

@ -37,6 +37,23 @@
_reg->offset + offsetof(typeof(*_ptr), _fld))) _reg->offset + offsetof(typeof(*_ptr), _fld)))
static void vfio_display_edid_link_up(void *opaque)
{
VFIOPCIDevice *vdev = opaque;
VFIODisplay *dpy = vdev->dpy;
int fd = vdev->vbasedev.fd;
dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP;
if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
goto err;
}
trace_vfio_display_edid_link_up();
return;
err:
trace_vfio_display_edid_write_error();
}
static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled, static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
int prefx, int prefy) int prefx, int prefy)
{ {
@ -49,6 +66,7 @@ static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
.prefy = prefy ?: vdev->display_yres, .prefy = prefy ?: vdev->display_yres,
}; };
timer_del(dpy->edid_link_timer);
dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN; dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) { if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
goto err; goto err;
@ -80,11 +98,8 @@ static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
goto err; goto err;
} }
dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP; timer_mod(dpy->edid_link_timer,
if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) { qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 100);
goto err;
}
trace_vfio_display_edid_link_up();
return; return;
err: err:
@ -150,6 +165,9 @@ static void vfio_display_edid_init(VFIOPCIDevice *vdev)
vdev->display_yres = dpy->edid_regs->max_yres; vdev->display_yres = dpy->edid_regs->max_yres;
} }
dpy->edid_link_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
vfio_display_edid_link_up, vdev);
vfio_display_edid_update(vdev, true, 0, 0); vfio_display_edid_update(vdev, true, 0, 0);
return; return;
@ -168,6 +186,8 @@ static void vfio_display_edid_exit(VFIODisplay *dpy)
g_free(dpy->edid_regs); g_free(dpy->edid_regs);
g_free(dpy->edid_blob); g_free(dpy->edid_blob);
timer_del(dpy->edid_link_timer);
timer_free(dpy->edid_link_timer);
} }
static void vfio_display_update_cursor(VFIODMABuf *dmabuf, static void vfio_display_update_cursor(VFIODMABuf *dmabuf,

1
include/hw/vfio/vfio-common.h
View file

@ -151,6 +151,7 @@ typedef struct VFIODisplay {
struct vfio_region_info *edid_info; struct vfio_region_info *edid_info;
struct vfio_region_gfx_edid *edid_regs; struct vfio_region_gfx_edid *edid_regs;
uint8_t *edid_blob; uint8_t *edid_blob;
QEMUTimer *edid_link_timer;
struct { struct {
VFIORegion buffer; VFIORegion buffer;
DisplaySurface *surface; DisplaySurface *surface;