[Spice-devel] [PATCH] add io ports for sleep (S3) support

[Alon Levy]

On Sun, May 22, 2011 at 04:23:55PM +0300, Alon Levy wrote:

Please ignore for now - I'm not sure this is worthwhile if we have to support S4.

> related RHBZ: 688883
> 
> Sleep is supported by the following flow:
>     (G stands for Guest, D is the device, not the driver)
>  G: QXL_IO_ABOUT_TO_SLEEP
>  G: acpi reset
>  D: qxl_reset_handler (ignored)
>  G: QXL_IO_RETURNED_FROM_SLEEP
> 
> Thereby the spice-server and the driver never reset during sleep.
> 
> After an ABOUT there are three options:
>  RETURNED - normal case
>  vga io port written to - we already handle this by doing a qxl_soft_reset
>  QXL_IO_RESET - we call qxl_hard_reset which calls qxl_soft_reset
> 
> So to handle the two unmatched cases we just need to make sure qxl_soft_reset
> forgets the "ABOUT_TO_SLEEP".
> ---
>  spice/qxl_dev.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/spice/qxl_dev.h b/spice/qxl_dev.h
> index e3e0696..36210a0 100644
> --- a/spice/qxl_dev.h
> +++ b/spice/qxl_dev.h
> @@ -80,6 +80,9 @@ enum {
>      QXL_IO_DESTROY_PRIMARY,
>      QXL_IO_DESTROY_SURFACE_WAIT,
>      QXL_IO_DESTROY_ALL_SURFACES,
> +    /* sleep support */
> +    QXL_IO_ABOUT_TO_SLEEP,
> +    QXL_IO_RETURNED_FROM_SLEEP,
>  
>      QXL_IO_RANGE_SIZE
>  };
> -- 
> 1.7.5.1
> 
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