Gerd Hoffmann wrote:
> These patches enable usb autosuspend for the qemu emulated HID devices.
> This reduces the cpu load for idle guests with a hid device attached
> because the linux kernel will suspend the usb bus then and qemu can stop
> running a 1000 Hz to emulate the (active) UHCI controller.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> Makefile.am | 5 +++++
> extras/qemu/42-qemu-usb.rules | 13 +++++++++++++
> rules/misc/30-kernel-compat.rules | 5 +++++
> 3 files changed, 23 insertions(+), 0 deletions(-)
> create mode 100644 extras/qemu/42-qemu-usb.rules
>
> diff --git a/Makefile.am b/Makefile.am
> index 2e3fe39..b2300ce 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -317,6 +317,11 @@ extras_v4l_id_v4l_id_LDADD = libudev/libudev-private.la
> libexec_PROGRAMS += extras/v4l_id/v4l_id
> dist_udevrules_DATA += extras/v4l_id/60-persistent-v4l.rules
>
> +# ------------------------------------------------------------------------------
> +# qemu -- qemu/kvm guest tweaks
> +# ------------------------------------------------------------------------------
> +dist_udevrules_DATA += extras/qemu/99-qemu-usb.rules
That should be 42-qemu-usb.rules
-jim
> +
> if ENABLE_EXTRAS
> # ------------------------------------------------------------------------------
> # conditional extras (need glib, libusb, libacl, ...)
> diff --git a/extras/qemu/42-qemu-usb.rules b/extras/qemu/42-qemu-usb.rules
> new file mode 100644
> index 0000000..4fd53c7
> --- /dev/null
> +++ b/extras/qemu/42-qemu-usb.rules
> @@ -0,0 +1,13 @@
> +#
> +# Enable autosuspend for qemu emulated usb hid devices.
> +#
> +# Note that there are buggy qemu versions which advertise remote
> +# wakeup support but don't actually implement it correctly. This
> +# is the reason why we need a match for the serial number here.
> +# The serial number "42" is used to tag the implementations where
> +# remote wakeup is working.
> +#
> +
> +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Mouse", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto"
> +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Tablet", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto"
> +CTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Keyboard", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto"
> diff --git a/rules/misc/30-kernel-compat.rules b/rules/misc/30-kernel-compat.rules
> index 2c545dc..2a6a97c 100644
> --- a/rules/misc/30-kernel-compat.rules
> +++ b/rules/misc/30-kernel-compat.rules
> @@ -97,4 +97,9 @@ SUBSYSTEM=="mmc", RUN+="/sbin/modprobe -b mmc_block"
> SUBSYSTEM=="pnp", DRIVER!="?*", \
> RUN{ignore_error}+="/bin/sh -c '/sbin/modprobe -a $$(while read id; do echo pnp:d$$id; done < /sys$devpath/id)'"
>
> +# see extras/qemu/42-qemu-usb.rules, version for 2.6.32 + older.
> +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Mouse", ATTR{serial}=="42", TEST=="power/level", ATTR{power/level}="auto"
> +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Tablet", ATTR{serial}=="42", TEST=="power/level", ATTR{power/level}="auto"
> +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Keyboard", ATTR{serial}=="42", TEST=="power/level", ATTR{power/level}="auto"
> +
> LABEL="kernel_compat_end"
> --
> 1.7.1
>
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