linux-toradex.git/drivers/hv/channel.c, branch v3.11 Linux kernel for Apalis and Colibri modules Drivers: hv: vmbus: Implement multi-channel support 2013-06-03T21:09:14+00:00 K. Y. Srinivasan kys@microsoft.com 2013-05-23T19:02:32+00:00 e68d2971d26577b932a16333ce165af98a96e068 Starting with Win8, the host supports multiple sub-channels for a given device. As in the past, the initial channel offer specifies the device and is associated with both the type and the instance GUIDs. For performance critical devices, the host may support multiple sub-channels. The sub-channels share the same type and instance GUID as the primary channel. The number of sub-channels offerrred to the guest depends on the number of virtual CPUs assigned to the guest. The guest can request the creation of these sub-channels and once created and opened, the guest can distribute the traffic across all the channels (the primary and the sub-channels). A request sent on a sub-channel will have the response delivered on the same sub-channel. At channel (sub-channel) creation we bind the channel interrupt to a CPU and with this sub-channel support we will be able to spread the interrupt load of a given device across all available CPUs. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Starting with Win8, the host supports multiple sub-channels for a given
device. As in the past, the initial channel offer specifies the device and
is associated with both the type and the instance GUIDs. For performance
critical devices, the host may support multiple sub-channels. The sub-channels
share the same type and instance GUID as the primary channel. The number of
sub-channels offerrred to the guest depends on the number of virtual CPUs
assigned to the guest. The guest can request the creation of these sub-channels
and once created and opened, the guest can distribute the traffic across all
the channels (the primary and the sub-channels). A request sent on a sub-channel
will have the response delivered on the same sub-channel.

At channel (sub-channel) creation we bind the channel interrupt to a CPU and
with this sub-channel support we will be able to spread the interrupt load
of a given device across all available CPUs.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: remove unused variable in vmbus_recvpacket_raw() 2013-01-17T19:46:09+00:00 Wei Yongjun yongjun_wei@trendmicro.com.cn 2012-12-04T05:15:42+00:00 f994a154c5318d132200862686fde13dca0979b1 The variable userlen is initialized but never used otherwise, so remove the unused variable. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
The variable userlen is initialized but never used
otherwise, so remove the unused variable.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Implement flow management on the send side 2013-01-17T19:41:49+00:00 K. Y. Srinivasan kys@microsoft.com 2012-12-01T14:46:57+00:00 c2b8e5202cf7670f918d0f7439ed2123cd58e1b7 Implement flow management on the send side. When the sender is blocked, the reader can potentially signal the sender to indicate there is now room to send. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Implement flow management on the send side. When the sender is blocked, the reader
can potentially signal the sender to indicate there is now room to send.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Add state to manage incoming channel interrupt load 2013-01-17T19:39:14+00:00 K. Y. Srinivasan kys@microsoft.com 2012-12-01T14:46:48+00:00 abbf3b2aa090b4a6bf22c935924b6467990266da Add state to bind a channel to a specific VCPU. This will help us better distribute incoming interrupt load. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Add state to bind a channel to a specific VCPU. This will help us better
distribute incoming interrupt load.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Change the signature of vmbus_set_event() 2013-01-17T19:34:36+00:00 K. Y. Srinivasan kys@microsoft.com 2012-12-01T14:46:43+00:00 21c3bef5db359596806f19fee6c3ec0c033881d0 In preparation for supporting a per-connection signaling mechanism, change the signature of vmbus_set_event(). This change is also needed to implement other aspects of the signaling optimization. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
In preparation for supporting a per-connection signaling mechanism,
change the signature of vmbus_set_event(). This change is also
needed to implement other aspects of the signaling optimization.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Optimize the signaling on the write path 2013-01-17T18:46:39+00:00 K. Y. Srinivasan kys@microsoft.com 2012-12-01T14:46:36+00:00 98fa8cf4bcc79cb14de8fd815bbcd00dcbd7b20e The host has already implemented the "read" side optimizations. Leverage that to optimize "write" side signaling. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
The host has already implemented the "read" side optimizations.
Leverage that to optimize "write" side signaling.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Merge 3.7-rc3 into char-misc-next 2012-10-29T15:44:40+00:00 Greg Kroah-Hartman gregkh@linuxfoundation.org 2012-10-29T15:44:40+00:00 e64de3b96c1ba3c1de236a4a103ec21234a5849f This brings in the various 3.7-rc3 char fixes into char-misc-next. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
This brings in the various 3.7-rc3 char fixes into char-misc-next.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Cleanup error handling in vmbus_open() 2012-10-24T22:46:27+00:00 K. Y. Srinivasan kys@microsoft.com 2012-10-12T20:22:42+00:00 1392550240aaa72ce3a094a38bd23525cd67ce60 Fix a memory leak in the error handling path in the function vmbus_open(). Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reported-by: Jason Wang <jasowang@redhat.com> Cc: Stable <stable@vger.kernel.org> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Fix a memory leak  in the error handling path in the function vmbus_open().

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Reported-by: Jason Wang <jasowang@redhat.com>
Cc: Stable <stable@vger.kernel.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drivers: hv: Get rid of unnecessary forward declarations 2012-10-24T22:45:35+00:00 K. Y. Srinivasan kys@microsoft.com 2012-10-12T20:22:41+00:00 8b5c8b6396bc008fc23ade51a260594d59db4749 Get rid of unnecessary forward declarations. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reported-by: Jason Wang <jasowang@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Get rid of unnecessary forward declarations.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Reported-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Staging: hv: move hyperv code out of staging directory 2011-10-11T04:52:55+00:00 Greg Kroah-Hartman gregkh@suse.de 2011-10-04T19:29:52+00:00 46a971913611a23478283931460a95be962ce329 After many years wandering the desert, it is finally time for the Microsoft HyperV code to move out of the staging directory. Or at least the core hyperv bus code, and the utility driver, the rest still have some review to get through by the various subsystem maintainers. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> 
After many years wandering the desert, it is finally time for the
Microsoft HyperV code to move out of the staging directory.  Or at least
the core hyperv bus code, and the utility driver, the rest still have
some review to get through by the various subsystem maintainers.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>