- 01 May, 2016 12 commits
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Srinivas Kandagatla authored
This patch moves to nvmem support in the driver to use callback instead of regmap. Reported-by:
Rajendra Nayak <rjendra@qti.qualcomm.com> Signed-off-by:
Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Srinivas Kandagatla authored
This patch moves to nvmem support in the driver to use callback instead of regmap. Signed-off-by:
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Srinivas Kandagatla authored
This patch moves to nvmem support in the driver to use callback instead of regmap. Signed-off-by:
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Srinivas Kandagatla authored
nvmem uses regmap_raw_read/write apis to read/write data from providers, regmap raw apis stopped working with recent kernels which removed raw accessors on mmio bus. This resulted in broken nvmem for providers which are based on regmap mmio bus. This issue can be fixed temporarly by moving to other regmap apis, but we might hit same issue in future. Moving to interfaces based on read/write callbacks from providers would be more robust. This patch removes regmap dependency from nvmem and introduces read/write callbacks from the providers. Without this patch nvmem providers like qfprom based on regmap mmio bus would not work. Reported-by:
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Aaron Sierra authored
Consolidate vme_bridge structure setup that every bridge was required to do itself. This came about because .irq_mtx is only used within the VME core, but was required to be setup externally. This returns the structure passed in to support shorthand like this: bridge = vme_init_bridge(&priv->bridge); Signed-off-by:Aaron Sierra <asierra@xes-inc.com> Acked-by:
Martyn Welch <martyn@welchs.me.uk> Signed-off-by:
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Krzysztof Kozlowski authored
The devres.o gets linked if HAS_IOMEM is present so on ARCH=um allyesconfig (COMPILE_TEST) failed on many files with: drivers/built-in.o: In function `mtk_thermal_probe': mtk_thermal.c:(.text+0x394618): undefined reference to `devm_ioremap_resource' The users of devm_ioremap_resource() which are compile-testable should depend on HAS_IOMEM. Signed-off-by:
Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by:
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Aaron Sierra authored
Fix a typo in the spurious interrupt warning and consistently capitalize VME, PCI, and DMA acronyms. Signed-off-by:
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Vitaly Kuznetsov authored
lsvmbus keeps its own copy of all VMBus UUIDs, add PCIe pass-through device there to not report 'Unknown' for such devices. Signed-off-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
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Vitaly Kuznetsov authored
We set host_specified_ha_region = true on certain request but this is a global state which stays 'true' forever. We need to reset it when we receive a request where ha_region is not specified. I did not see any real issues, the bug was found by code inspection. Signed-off-by:
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Vitaly Kuznetsov authored
When we iterate through all HA regions in handle_pg_range() we have an assumption that all these regions are sorted in the list and the 'start_pfn >= has->end_pfn' check is enough to find the proper region. Unfortunately it's not the case with WS2016 where host can hot-add regions in a different order. We end up modifying the wrong HA region and crashing later on pages online. Modify the check to make sure we found the region we were searching for while iterating. Fix the same check in pfn_covered() as well. Signed-off-by:
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Vitaly Kuznetsov authored
Kdump keeps biting. Turns out CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was used for initial contact or to CPU0 depending on host version. vmbus_wait_for_unload() doesn't account for the fact that in case we're crashing on some other CPU we won't get the CHANNELMSG_UNLOAD_RESPONSE message and our wait on the current CPU will never end. Do the following: 1) Check for completion_done() in the loop. In case interrupt handler is still alive we'll get the confirmation we need. 2) Read message pages for all CPUs message page as we're unsure where CHANNELMSG_UNLOAD_RESPONSE is going to be delivered to. We can race with still-alive interrupt handler doing the same, add cmpxchg() to vmbus_signal_eom() to not lose CHANNELMSG_UNLOAD_RESPONSE message. 3) Cleanup message pages on all CPUs. This is required (at least for the current CPU as we're clearing CPU0 messages now but we may want to bring up additional CPUs on crash) as new messages won't be delivered till we consume what's pending. On boot we'll place message pages somewhere else and we won't be able to read stale messages. Signed-off-by:
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Vitaly Kuznetsov authored
Hyper-V VMs can be replicated to another hosts and there is a feature to set different IP for replicas, it is called 'Failover TCP/IP'. When such guest starts Hyper-V host sends it KVP_OP_SET_IP_INFO message as soon as we finish negotiation procedure. The problem is that it can happen (and it actually happens) before userspace daemon connects and we reply with HV_E_FAIL to the message. As there are no repetitions we fail to set the requested IP. Solve the issue by postponing our reply to the negotiation message till userspace daemon is connected. We can't wait too long as there is a host-side timeout (cca. 75 seconds) and if we fail to reply in this time frame the whole KVP service will become inactive. The solution is not ideal - if it takes userspace daemon more than 60 seconds to connect IP Failover will still fail but I don't see a solution with our current separation between kernel and userspace parts. Other two modules (VSS and FCOPY) don't require such delay, leave them untouched. Signed-off-by:
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- 30 Apr, 2016 27 commits
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Vladimir Zapolskiy authored
Both devm_ioremap() and devm_ioremap_wc() functions return either a pointer to valid iomem region or NULL, check for IS_ERR() is improper and may result in oops on error path. Now on error -ENOMEM is returned. Fixes: 0ab163ad ("misc: sram: switch to ioremap_wc from ioremap") Signed-off-by:
Vladimir Zapolskiy <vz@mleia.com> Signed-off-by:
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Sudip Mukherjee authored
The variable p is a data structure which is used by the driver core internally and it is not expected that busses will be directly accessing these driver core internal only data. Signed-off-by:
Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by:
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Alexander Usyskin authored
A control message reply may not be received if either a link reset has occurred or disconnection is initiated by the FW. In the both cases the client state will be set straight to DISCONNECTED and the driver will wait till timeout. Adding DISCONNECTED state in the waiting condition will release the client from the stall. Signed-off-by:
Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by:
Tomas Winkler <tomas.winkler@intel.com> Signed-off-by:
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Alexander Usyskin authored
Timeout on notify request is not a fatal condition, and actually cleaning control queues will disrupt other control flows of the same client. Signed-off-by:
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Alexander Usyskin authored
When a message is received and amthif client is not in reading state the message is ignored and left dangling in the queue. This may happen after one of the amthif host connections is closed w/o completing the reading. Another client will pick up a wrong message on next read attempt which will lead to link reset. To prevent this the driver has to properly discard the message when amthif client is not in reading state. Cc: <stable@vger.kernel.org> #4.2+ Signed-off-by:
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Alexander Usyskin authored
In the case when disconnection is initiated from the FW the driver is flushing items from the write control list while iterating over it: mei_irq_write_handler() list_for_each_entry_safe(ctrl_wr_list) <-- outer loop mei_cl_irq_disconnect_rsp() mei_cl_set_disconnected() mei_io_list_flush(ctrl_wr_list) <-- destorying list We move the list flushing to the completion routine. Cc: <stable@vger.kernel.org> #4.2+ Signed-off-by: -
Alexander Usyskin authored
Global me_client_index is used only during the enumeration process and can be effectively replaced by me_addr data from the last enumeration response as we always enumerate clients in the increasing order. Signed-off-by:
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Alexey Khoroshilov authored
If cldrv->probe() failed in mei_cl_device_probe(), the mei module is left pinned. The patch moves __module_get(THIS_MODULE) after cldrv->probe(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:
Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by:
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Sudip Mukherjee authored
If devm_add_action() fails we are explicitly calling dma_unmap_single(), pci_unmap_single() and kfree(). Lets use the helper devm_add_action_or_reset() and return directly in case of error, as we know that the cleanup function has been already called by the helper if there was any error. At that same time remove the variable rc which becomes unused now. Signed-off-by:
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Jake Oshins authored
Simplify the logic that picks MMIO ranges by pulling out the logic related to trying to lay frame buffer claim on top of where the firmware placed the frame buffer. Signed-off-by:
Jake Oshins <jakeo@microsoft.com> Signed-off-by:
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Jake Oshins authored
Later in the boot sequence, we need to figure out which memory ranges can be given out to various paravirtual drivers. The hyperv_fb driver should, ideally, be placed right on top of the frame buffer, without some other device getting plopped on top of this range in the meantime. Recording this now allows that to be guaranteed. Signed-off-by:
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Jake Oshins authored
This patch changes vmbus_allocate_mmio() and vmbus_free_mmio() so that when child paravirtual devices allocate memory-mapped I/O space, they allocate it privately from a resource tree pointed at by hyperv_mmio and also by the public resource tree iomem_resource. This allows the region to be marked as "busy" in the private tree, but a "bridge window" in the public tree, guaranteeing that no two bridge windows will overlap each other but while also allowing the PCI device children of the bridge windows to overlap that window. One might conclude that this belongs in the pnp layer, rather than in this driver. Rafael Wysocki, the maintainter of the pnp layer, has previously asked that we not modify the pnp layer as it is considered deprecated. This patch is thus essentially a workaround. Signed-off-by:
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Jake Oshins authored
A patch later in this series allocates child nodes in this resource tree. For that to work, this tree needs to be sorted in ascending order. Signed-off-by:
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Jake Oshins authored
This patch modifies all the callers of vmbus_mmio_allocate() to call vmbus_mmio_free() instead of release_mem_region(). Signed-off-by:
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Jake Oshins authored
This patch introduces a function that reverses everything done by vmbus_allocate_mmio(). Existing code just called release_mem_region(). Future patches in this series require a more complex sequence of actions, so this function is introduced to wrap those actions. Signed-off-by:
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Jake Oshins authored
In existing code, this tree of resources is created in single-threaded code and never modified after it is created, and thus needs no locking. This patch introduces a semaphore for tree access, as other patches in this series introduce run-time modifications of this resource tree which can happen on multiple threads. Signed-off-by:
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K. Y. Srinivasan authored
Implement APIs for in-place consumption of vmbus packets. Currently, each packet is copied and processed one at a time and as part of processing each packet we potentially may signal the host (if it is waiting for room to produce a packet). These APIs help batched in-place processing of vmbus packets. We also optimize host signaling by having a separate API to signal the end of in-place consumption. With netvsc using these APIs, on an iperf run on average I see about 20X reduction in checks to signal the host. Signed-off-by:
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K. Y. Srinivasan authored
In preparation for implementing APIs for in-place consumption of VMBUS packets, movve some ring buffer functionality into hyperv.h Signed-off-by:
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K. Y. Srinivasan authored
In preparation for moving some ring buffer functionality out of the vmbus driver, export the API for signaling the host. Signed-off-by:
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K. Y. Srinivasan authored
Use the virt_xx barriers that have been defined for use in virtual machines. Signed-off-by:
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K. Y. Srinivasan authored
Use the READ_ONCE macro to access variabes that can change asynchronously. This is the recommended mechanism for dealing with "unsafe" compiler optimizations. Signed-off-by:
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K. Y. Srinivasan authored
Introduce separate functions for estimating how much can be read from and written to the ring buffer. Signed-off-by:
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K. Y. Srinivasan authored
On the consumer side, we have interrupt driven flow management of the producer. It is sufficient to base the signaling decision on the amount of space that is available to write after the read is complete. The current code samples the previous available space and uses this in making the signaling decision. This state can be stale and is unnecessary. Since the state can be stale, we end up not signaling the host (when we should) and this can result in a hang. Fix this problem by removing the unnecessary check. I would like to thank Arseney Romanenko <arseneyr@microsoft.com> for pointing out this issue. Also, issue a full memory barrier before making the signaling descision to correctly deal with potential reordering of the write (read index) followed by the read of pending_sz. Signed-off-by:
Dexuan Cui <decui@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Sudip Mukherjee authored
The drivers which depends on parport may sometimes try to iniitialize and register with parport bus even before parport has actually registered with the device layer. The simplest solution is to mark the init function as subsys_initcall() and load the parport before the other drivers loads. Signed-off-by:
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Amitoj Kaur Chawla authored
Return statements at the end of void functions are useless. The Coccinelle semantic patch used to make this change is as follows: //<smpl> @@ identifier f; expression e; @@ void f(...) { <... - return e; ...> } //</smpl> Signed-off-by:Amitoj Kaur Chawla <amitoj1606@gmail.com> Signed-off-by:
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Dan Carpenter authored
My static checker complains that we still use "mark" even when the _scif_fence_mark() call fails so it can be uninitialized. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Sudeep Dutt authored
Fixes randconfig build error reported at https://lkml.org/lkml/2016/4/3/135 by ensuring that the VOP driver selects VIRTIO. Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Reviewed-by:
Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by:
Sudeep Dutt <sudeep.dutt@intel.com> Acked-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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- 27 Apr, 2016 1 commit
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Ashutosh Dixit authored
The MIC VOP driver does two successive reads from user space to read a variable length data structure. Kernel memory corruption can result if the data structure changes between the two reads. This patch disallows the chance of this happening. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116651 Reported by: Pengfei Wang <wpengfeinudt@gmail.com> Reviewed-by:
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