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2013-01-20NTB: use simple_open for debugfsJon Mason
Use simple_open for debugfs instead of recreating it in the NTB driver. Caught by coccicheck. Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-20NTB: No sleeping in interrupt contextJon Mason
Move all cancel_delayed_work_sync to a work thread to prevent sleeping in interrupt context (when the NTB link goes down). Caught via 'Sleep inside atomic section checking' Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-20NTB: separate transmit and receive windowsJon Mason
Since it is possible for the memory windows on the two NTB connected systems to be different sizes, the divergent sizes must be accounted for in the segmentation of the MW's on each side. Create separate size variables and initialization as necessary. Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-20NTB: correct memory barrierJon Mason
mmiowb is not sufficient to flush the data and is causing data corruption. Change to wmb and the data corruption is no more. Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-20NTB: Handle ntb client device probes without present hardwareJon Mason
Attempts to probe client ntb drivers without ntb hardware present will result in null pointer dereference due to the lack of the ntb bus device being registers. Check to see if this is the case, and fail all calls by the clients registering their drivers. Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-18ipack/devices/ipoctal: add missing rx_enable = 1Samuel Iglesias Gonsalvez
There was a bug in the code when managing a GE IP-OCTAL-485 board. The RX would be enabled but we have a wrong state in the rx_enable flag. Then, if the user changes the terminal settings, RX would not be enabled again. Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-18Drivers: hv: Bind all vmbbus interrupts to the boot CPUK. Y. Srinivasan
The default interrupt delivery model in Linux does not support the Hyper-V vmbus delivery model when the guest is configured with multiple VCPUs. I have sent a patch to address this - delivering the vmbus interrupt on a separate IDT vector. Until this patch is applied, bind all vmbus interrupts to the boot CPU. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-18Drivers: hv: vmbus_flow_handler() can be staticFengguang Wu
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-18Merge 3.8-rc4 into char-misc-nextGreg Kroah-Hartman
This brings in all of the mei and other fixes that are needed to continue development in this branch. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17ntb: remove __dev* markingsGreg Kroah-Hartman
These are now gone from the kernel, so remove them from the newly-added drivers before they start to cause build errors for people. Cc: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17net: Add support for NTB virtual ethernet deviceJon Mason
A virtual ethernet device that uses the NTB transport API to send/receive data. Signed-off-by: Jon Mason <jon.mason@intel.com> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17PCI-Express Non-Transparent Bridge SupportJon Mason
A PCI-Express non-transparent bridge (NTB) is a point-to-point PCIe bus connecting 2 systems, providing electrical isolation between the two subsystems. A non-transparent bridge is functionally similar to a transparent bridge except that both sides of the bridge have their own independent address domains. The host on one side of the bridge will not have the visibility of the complete memory or I/O space on the other side of the bridge. To communicate across the non-transparent bridge, each NTB endpoint has one (or more) apertures exposed to the local system. Writes to these apertures are mirrored to memory on the remote system. Communications can also occur through the use of doorbell registers that initiate interrupts to the alternate domain, and scratch-pad registers accessible from both sides. The NTB device driver is needed to configure these memory windows, doorbell, and scratch-pad registers as well as use them in such a way as they can be turned into a viable communication channel to the remote system. ntb_hw.[ch] determines the usage model (NTB to NTB or NTB to Root Port) and abstracts away the underlying hardware to provide access and a common interface to the doorbell registers, scratch pads, and memory windows. These hardware interfaces are exported so that other, non-mainlined kernel drivers can access these. ntb_transport.[ch] also uses the exported interfaces in ntb_hw.[ch] to setup a communication channel(s) and provide a reliable way of transferring data from one side to the other, which it then exports so that "client" drivers can access them. These client drivers are used to provide a standard kernel interface (i.e., Ethernet device) to NTB, such that Linux can transfer data from one system to the other in a standard way. Signed-off-by: Jon Mason <jon.mason@intel.com> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: include slab.h into files using kmalloc/kfreeDmitry Torokhov
Do not rely on implicit header dependencies as they are known to break. Reported-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: rename PPNset to ppn_set to avoid camel caseDmitry Torokhov
Acked-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: Fix "always true condition"Andy King
vmci_send_datagram() returns an int, with negative values indicating failure. But we store it locally in a u32, which makes comparison of >= 0 useless. Fixed to use an int. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: Fix deref before NULL-check of queuepair ptrAndy King
Check for a valid queuepair ptr before trying to lock the queuepair (which will deref it). Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: Remove dependency on BLOCK I/OAndy King
No need to bring in dm-mapper.h and along with it a dependency on BLOCK I/O just to use dm_div_up(). Just use the existing DIV_ROUND_UP(). Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17VMCI: Add PCI as a dependencyAndy King
Add PCI as a dependency to our build, since we always compile in the guest-side PCI device support. Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17pcmcia/vrc4171: Add missing spinlock initJean Delvare
It doesn't seem this spinlock was properly initialized. This bug was introduced by commit 7a410e8d4d97457c8c381e2de9cdc7bd3306badc. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17pcmcia: i82092: fix i82092aa_pci_remove()Dan Carpenter
Smatch complains because the call to pci_set_drvdata(dev, &sockets[i].socket); is reading one step beyond the end of the sockets[] array. It will crash when we use it later. The only place which uses pci_get_drvdata() is i82092aa_pci_remove(). That function should loop through all the sockets and unregister them. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17mei: Fix some more kernel-doc typos in hw-me.cSedat Dilek
Signed-off-by: Sedat Dilek <sedat.dilek@gmail.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: Cleanup and consolidate reporting of build/version infoK. Y. Srinivasan
Now, cleanup and consolidate reporting of host and vmbus version numbers. 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: Capture the host build informationK. Y. Srinivasan
Capture the host build information so it can be presented along with the negotiated vmbus version information. 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: 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: Enable protocol negotiation with win8 hostsK. Y. Srinivasan
Now that we have implemented all of the Win8 (WS2012) functionality, negotiate Win8 protocol with the host. 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 a check to deal with spurious interruptsK. Y. Srinivasan
We establish the handler before we have fully initialized the VMBUS state. Deal with spurious interrupts. 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: Handle vmbus interrupts concurrently on all cpusK. Y. Srinivasan
Vmbus interrupts are unique in that while the interrupt is delivered on a given vector, these can be handled concurrently on different CPUs. Handle the vmbus interrupts concurrently on all the 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: Manage event tasklets on per-cpu basisK. Y. Srinivasan
Now that we can potentially take vmbus interrupts on any CPU, make the tasklets per-CPU. 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: Get rid of unnecessary request for offersK. Y. Srinivasan
This call to seek offers is not necessary and just adds unnecessary delay. Get rid of it. 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: Get rid of the unused global signaling stateK. Y. Srinivasan
Now that we have implemented a per-connection signaling mechanism, get rid of the global signaling state. For hosts that don't support per-connection signaling handle, we have moved the global state to be a per-channel state. 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 code to distribute channel interrupt loadK. Y. Srinivasan
Implement a simple policy for distributing incoming interrupt load. We classify channels as (a) performance critical and (b) not performance critical. All non-performance critical channels will be bound to the boot cpu. Performance critical channels will be bound to the remaining available CPUs on a round-robin basis. 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: Modify the interrupt handling code to support win8 and beyondK. Y. Srinivasan
Starting with Win8 (WS2012), the event page can be used to directly get the channel ID that needs servicing. Modify the channel event handling code to take advantage of this feature. 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: Setup a mapping for Hyper-V's notion cpu IDK. Y. Srinivasan
On win8 (ws2012), incoming vmbus interrupt load can be spread across all available VCPUs in the guest. On a per-channel basis, the interrupts can be bound to specific CPUs. The Linux notion of cpu ID may be different from that of the hypervisor's. Setup a mapping structure. 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: Cleanup vmbus_set_event() to support win7 and beyondK. Y. Srinivasan
On win7 (ws2008 R2) and beyond, we have the notion of having dedicated interrupts on a per-channel basis. When a channel has a dedicated interrupt assigned, there is no need to set the interrupt bit in the shared page. Implement this 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: Manage signaling state on a per-connection basisK. Y. Srinivasan
The current code has a global handle for supporting signaling of the host from guest. Make this a per-channel attribute as on some versions of the host we can signal on per-channel handle. 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: Move vmbus version definitions to hyperv.hK. Y. Srinivasan
To support version specific optimization in various vmbus drivers, move the vmbus definitions to the public header file. 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: Change the signature for hv_signal_event()K. Y. Srinivasan
In preparation for implementing a per-connection signaling framework, change the signature of the function hv_signal_event(). The current code uses a global handle for signaling the host. 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: Save and export negotiated vmbus versionK. Y. Srinivasan
Export the negotiated vmbus version as this may be useful for individual drivers. 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: Support handling multiple VMBUS versionsK. Y. Srinivasan
The current code hard coded the vmbus version independent of the host it was running on. Add code to dynamically negotiate the most appropriate version. 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: Get rid of hv_get_ringbuffer_interrupt_mask()K. Y. Srinivasan
This function is no longer used; get rid of it. 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>
2013-01-17Drivers: hv: Optimize signaling in the read pathK. Y. Srinivasan
Now that we have the infratructure for correctly determining when we should signal the host; optimize the signaling on the read side - signaling the guest from the host. 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: Turn off batched reading for util driversK. Y. Srinivasan
Util driver is not a performance critical driver and furthermore some util services such as KVP can only handle one outstanding message from the host. Turn off batched reading for util drivers. 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 batched readingK. Y. Srinivasan
For the "read" side signaling optimization, the reader has to completely drain the queue before exiting. Add state to manage this "batched" reading. 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: Implement routines for read side signaling optimizationK. Y. Srinivasan
Implement functions that will support read-side signaling optimization. By having the reader indicate the start of the "read" operation and the "end" of the read operation we can more efficiently handle the signaling protocol: while the read is in progress, there is no need for the "writer" to signal the "reader" as new items are put on the read queue. 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>
2013-01-17hv: hv_balloon: remove duplicated include from hv_balloon.cWei Yongjun
Remove duplicated include. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17misc: lattice-ecp3-config.c: remove __dev* markingsGreg Kroah-Hartman
These are now removed from the kernel, so remove them to allow the driver to build properly. Cc: Stefan Roese <sr@denx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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