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path: root/drivers/hv/channel.c
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2014-05-03hv: Remove unnecessary comparison of unsigned against 0Tobias Klauser
pfncount is of type u32 and thus can never be smaller than 0. Found by the coverity scanner, CID 143213. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-05-03Drivers: hv: Eliminate the channel spinlock in the callback pathK. Y. Srinivasan
By ensuring that we set the callback handler to NULL in the channel close path on the same CPU that the channel is bound to, we can eliminate this lock acquisition and release in a performance critical path. 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>
2014-02-07Drivers: hv: vmbus: Cleanup the packet send pathK. Y. Srinivasan
The current channel code is using scatterlist abstraction to pass data to the ringbuffer API on the send path. This causes unnecessary translations between virtual and physical addresses. Fix this. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-27hyperv: Add support for physically discontinuous receive bufferHaiyang Zhang
This will allow us to use bigger receive buffer, and prevent allocation failure due to fragmented memory. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-09-26hv: vmbus: fix vmbus_recvpacket_raw() return codeDan Carpenter
Don't return success if the buffer has not been initialized. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: delete vmbus_get_debug_info()Greg Kroah-Hartman
It's only used once, only contains 2 function calls, so just make those calls directly, deleting the function, and the now unneeded structure entirely. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "client/server_monitor_conn_id" bus attributes to dev_groupsGreg Kroah-Hartman
This moves the "client_monitor_conn_id" and "server_monitor_conn_id" bus attributes to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "client/server_monitor_latency" bus attributes to dev_groupsGreg Kroah-Hartman
This moves the "client_monitor_latency" and "server_monitor_latency" bus attributes to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "client/server_monitor_pending" bus attributes to dev_groupsGreg Kroah-Hartman
This moves the "client_monitor_pending" and "server_monitor_pending" bus attributes to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: make "monitor_pages" a "real" pointer arrayGreg Kroah-Hartman
monitor_pages was a void pointer, containing an unknown number of arrays that we just "knew" were a child and parent array of a specific size. Instead of that implicit knowledge, let's make them a real pointer, allowing us to have type safety, and a semblance of sane addressing schemes. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "device_id" bus attribute to dev_groupsGreg Kroah-Hartman
This moves the "device_id" bus attribute to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "class_id" bus attribute to dev_groupsGreg Kroah-Hartman
This moves the "class_id" bus attribute to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "monitor_id" bus attribute to dev_groupsGreg Kroah-Hartman
This moves the "state" bus attribute to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: move "state" bus attribute to dev_groupsGreg Kroah-Hartman
This moves the "state" bus attribute to the dev_groups structure, removing the need for it to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: use dev_groups for device attributesGreg Kroah-Hartman
This patch is the first in a series that moves the hv bus code to use the dev_groups field instead of dev_attrs, as dev_attrs is going away in future kernel releases. It moves the id sysfs file to the dev_groups structure, and creates the needed show/store functions, instead of relying on one "universal" function for this. By doing this, it removes the need for this to be in a temporary structure. Tested-by: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03Drivers: hv: vmbus: Implement multi-channel supportK. Y. Srinivasan
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>
2013-01-17Drivers: hv: remove unused variable in vmbus_recvpacket_raw()Wei Yongjun
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>
2013-01-17Drivers: hv: Implement flow management on the send sideK. Y. Srinivasan
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>
2013-01-17Drivers: hv: Add state to manage incoming channel interrupt loadK. Y. Srinivasan
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>
2013-01-17Drivers: hv: Change the signature of vmbus_set_event()K. Y. Srinivasan
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>
2013-01-17Drivers: hv: Optimize the signaling on the write pathK. Y. Srinivasan
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>
2012-10-29Merge 3.7-rc3 into char-misc-nextGreg Kroah-Hartman
This brings in the various 3.7-rc3 char fixes into char-misc-next. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-24Drivers: hv: Cleanup error handling in vmbus_open()K. Y. Srinivasan
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>
2012-10-24Drivers: hv: Get rid of unnecessary forward declarationsK. Y. Srinivasan
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>
2011-10-10Staging: hv: move hyperv code out of staging directoryGreg Kroah-Hartman
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>
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