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path: root/drivers/misc/mei/hbm.c
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2022-06-10mei: hbm: drop capability response on early shutdownAlexander Usyskin1-1/+2
Drop HBM responses also in the early shutdown phase where the usual traffic is allowed. Extend the rule that drop HBM responses received during the shutdown phase by also in MEI_DEV_POWERING_DOWN state. This resolves the stall if the driver is stopping in the middle of the link initialization or link reset. Drop the capabilities response on early shutdown. Fixes: 6d7163f2c49f ("mei: hbm: drop hbm responses on early shutdown") Cc: <stable@vger.kernel.org> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20220606144225.282375-2-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-30mei: hbm: fix client dma reply statusAlexander Usyskin1-6/+14
Don't blindly copy status value received from the firmware into internal client status field, It may be positive and ERR_PTR(ret) will translate it into an invalid address and the caller will crash. Put the error code into the client status on failure. Fixes: 369aea845951 ("mei: implement client dma setup.") Cc: <stable@vger.kernel.org> # v5.11+ Reported-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Tested-by: : Emmanuel Grumbach <emmanuel.grumbach@intel.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20211228082047.378115-1-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-10-13mei: hbm: drop hbm responses on early shutdownAlexander Usyskin1-4/+8
Drop HBM responses also in the early shutdown phase where the usual traffic is allowed. Extend the rule that drop HBM responses received during the shutdown phase by also in MEI_DEV_POWERING_DOWN state. This resolves the stall if the driver is stopping in the middle of the link init or link reset. Fixes: da3eb47c90d4 ("mei: hbm: drop hbm responses on shutdown") Fixes: 36edb1407c3c ("mei: allow clients on bus to communicate in remove callback") Cc: <stable@vger.kernel.org> # v5.12+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20211013074552.2278419-1-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-22mei: fix kdoc in the driverTamar Mashiah1-1/+1
Over time the functions were renamed, but this was not always reflected in kdoc, fix that. Signed-off-by: Tamar Mashiah <tamar.mashiah@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20210621193756.134027-1-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-06mei: implement client dma setup.Alexander Usyskin1-0/+124
Implement HBM message protocol to setup and tear down DMA buffer on behalf of an client. On top there DMA buffer allocation and its life time management. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20210206144325.25682-5-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-06mei: add support for client dma capabilityAlexander Usyskin1-1/+12
Client DMA capability indicates whether the firmware supports setting up a direct DMA channel between the host and me client. The DMA capabilities are supported from firmware HBM version 2.2 and newer. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20210206144325.25682-3-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29mei: hbm: drop hbm responses on shutdownAlexander Usyskin1-2/+24
Ignore and drop HBM responses from init phase in shutdown phase. Fixes stall if driver starting to stop in the middle of link init. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20210129120752.850325-4-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29mei: hbm: call mei_set_devstate() on hbm stop responseAlexander Usyskin1-1/+1
Use mei_set_devstate() wrapper upon hbm stop command response, to trigger sysfs event. Fixes: 43b8a7ed4739 ("mei: expose device state in sysfs") Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20210129120752.850325-3-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-03misc: mei: remove unneeded breakTom Rix1-1/+0
A break is not needed if it is preceded by a return Signed-off-by: Tom Rix <trix@redhat.com> Link: https://lore.kernel.org/r/20201019191808.9891-1-trix@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-18mei: add support for mei extended header.Tomas Winkler1-9/+5
Add an extend header beyond existing 4 bytes of the mei message header. The extension is of variable length, starting with meta header that contains the number of headers and the overall size of the extended headers excluding meta header itself followed by TLV list of extended headers. Currently only supported extension is the vtag. From the HW perspective the extended headers is already part of the payload. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Link: https://lore.kernel.org/r/20200818115147.2567012-5-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-18mei: restrict vtag support to hbm version 2.2Alexander Usyskin1-0/+15
The vtag allows partitioning the mei messages into virtual groups/channels. Vtags are supported for firmwares with HBM version 2.2 and newer and only when a firmware confirms the support via capability handshake. This change only define vtag restrictions in order to make the series bisectable. Everything will be enabled when driver HBM version is set to 2.2. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20200818115147.2567012-3-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-18mei: hbm: add capabilities messageAlexander Usyskin1-0/+72
The new capabilities command in HBM version 2.2 allows performing capabilities handshake between the firmware and the host driver. The driver requests a capability by setting the appropriate bit in 24bit wide bitmask and the fw responses with the bit set providing the requested capability is supported. Bump copyright year in affected files. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20200818115147.2567012-2-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-23mei: hbm: use sizeof of variable instead of struct typeTomas Winkler1-42/+32
There is a possibility of bug when variable type has changed but corresponding struct passed to the sizeof has not. Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20200723145927.882743-2-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-23Revert "mei: Avoid the use of one-element arrays"Greg Kroah-Hartman1-2/+2
This reverts commit 3c3b7ddef7879abb2c42422e898145826c79e5f0, as it turns out Tomas made a better series of patches for this same issue. Cc: Gustavo A. R. Silva <gustavoars@kernel.org> Cc: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-23mei: Avoid the use of one-element arraysGustavo A. R. Silva1-2/+2
One-element arrays are being deprecated[1]. Replace the one-element arrays with a simple value type u8 reserved, once this is just a placeholder for alignment. Also, while there, use the preferred form for passing a size of a struct. The alternative form where struct name is spelled out hurts readability and introduces an opportunity for a bug when the variable type is changed but the corresponding sizeof that is passed as argument is not. [1] https://github.com/KSPP/linux/issues/79 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20200714214516.GA1040@embeddedor Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-27mei: adjust the copyright notice in the files.Tomas Winkler1-1/+1
Use unified version of the copyright notice in the files Update copyright years according the year the files were touched, except this patch and SPDX conversions. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-27mei: convert to SPDX license tagsTomas Winkler1-12/+1
Replace boiler plate licenses texts with the SPDX license identifiers in the mei files header. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-20mei: hbm: clean the feature flags on link resetAlexander Usyskin1-0/+7
The list of supported functions can be altered upon link reset, clean the flags to allow correct selections of supported features. Cc: <stable@vger.kernel.org> v4.19+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-13mei: dma: silent the reject messageTomas Winkler1-3/+9
Not all FW versions support DMA on their first release, hence it is normal behavior to receive a reject response upon DMA setup request. In order to prevent confusion, the DMA setup reject message is printed only in debug level. Cc: <stable@vger.kernel.org> #v5.0+ Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-26mei: hw: add dma ring control blockTomas Winkler1-0/+2
The DMA ring control block contains write and read indices for host and device circular buffers. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-26mei: hbm: setup dma ringTomas Winkler1-3/+83
DMA ring is allocated upon HBM handshake and the ring parameters are set via dedicated HBM_DMA_SETUP request command. The firmware will perform its setup and respond with a status. On failure the DMA buffers are released. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-07mei: hbm: drop BUG() from the hbm handlerTomas Winkler1-2/+2
Drop BUG() from the hbm handler in order not to crash the whole kernel on faulty firmware implementation. Instead of it, just return an error resulting into link reset. There is no any known issue of faulty firmware in this matter, the change is just to ease the development. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-12mei: ignore not found client in the enumerationAlexander Usyskin1-3/+6
Some of the ME clients are available only for BIOS operation and are removed during hand off to an OS. However the removal is not instant. A client may be visible on the client list when the mei driver requests for enumeration, while the subsequent request for properties will be answered with client not found error value. The default behavior for an error is to perform client reset while this error is harmless and the link reset should be prevented. This issue started to be visible due to suspend/resume timing changes. Currently reported only on the Haswell based system. Fixes: [33.564957] mei_me 0000:00:16.0: hbm: properties response: wrong status = 1 CLIENT_NOT_FOUND [33.564978] mei_me 0000:00:16.0: mei_irq_read_handler ret = -71. [33.565270] mei_me 0000:00:16.0: unexpected reset: dev_state = INIT_CLIENTS fw status = 1E000255 60002306 00000200 00004401 00000000 00000010 Cc: <stable@vger.kernel.org> Reported-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-02mei: restrict dma ring support to hbm version 2.1Tomas Winkler1-0/+6
Only a firmware with version 2.1 and above supports dma ring feature. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-02mei: hbm: introduce dma bit in the message headerTomas Winkler1-0/+1
Add dma_ring bit in the mei message header for conveying that the message data itself are on the dma ring. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-02mei: add support for variable length mei headers.Tomas Winkler1-8/+22
Remove header size knowledge from me and txe hw layers, this requires to change the write handler to accept header and its length as well as data and its length. HBM messages are fixed to use basic header, hence we add mei_hbm2slots() that converts HBM message length and mei message header, while mei_data2slots() converts data length directly to the slots. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-04-08mei: hbm: remove variable length arraysTomas Winkler1-15/+14
Though VLA are supported by CC99 there are many cavities and should be avoided. 'const size_t len = sizeof()' that we used may not be set at the compile time hence generating VLA code. This fixes also sparse warning warning: Variable length array is used type. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-31mei: replace callback structures used as list head by list_headAlexander Usyskin1-1/+1
mei_dev structure used struct mei_cl_cb type variables as for holding callbacks list heads. Replace them by the actual struct list_head as there is no other info that is handled. This slims down the mei_dev structure and mostly streamline the code. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-11mei: bus: enable OS version only for SPT and newerAlexander Usyskin1-0/+4
Sending OS version for support of TPM2_ChangeEPS() is required only for SPT FW (HMB version 2.0) and newer. On older platforms the command should be just ignored by the firmware but some older platforms misbehave so it's safer to send the command only if required. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=192051 Fixes: 7279b238bade (mei: send OS type to the FW) Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Tested-by: Jan Niehusmann <jan@gondor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-27mei: stop the stall timer worker if not neededAlexander Usyskin1-0/+3
The stall timer worker checks periodically if there is a stalled i/o transaction. The issue with the current implementation is that the timer is ticking also when there is no pending i/o transaction. This patch provides a simple change that prevents rescheduling of the delayed work when there is no pending i/o. Cc: Andy Lutomirski <luto@kernel.org> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-30mei: add wrapper for queuing control commands.Tomas Winkler1-2/+2
Enclose the boiler plate code of allocating a control/hbm command cb and enqueueing it onto ctrl_wr.list in a convenient wrapper mei_cl_enqueue_ctrl_wr_cb(). This is a preparatory patch for enabling consecutive reads. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-30mei: use consistent naming for TX control flow creditsTomas Winkler1-21/+20
With the introduction of the receive control flow credits prefixed with rx_ we add tx_ prefix to the variables and function used for tracking the transmit control flow credits. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-30mei: hbm: add missing argument in the kdocTomas Winkler1-0/+1
In mei_hbm_cl_hdr buf argument was not described Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-06-11mei: drop wr_msg from the mei_dev structureAlexander Usyskin1-70/+67
The control messages are usually small, around 8 bytes, and can be allocated on the stack. Using on stack allocation allows us to drop 'wr_msg' a rather large buffer reserved in the mei_dev structure and relax contention of this device global buffer. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-05-01mei: fix NULL dereferencing during FW initiated disconnectionAlexander Usyskin1-2/+1
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 <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-05-01mei: drop global me_client_indexAlexander Usyskin1-15/+8
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: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-08mei: split amthif client init from end of clients enumerationAlexander Usyskin1-1/+1
The amthif FW client can appear after the end of client enumeration. Amthif host client initialization is done now at FW client discovery time. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-08mei: hbm: send immediate reply flag in enum requestAlexander Usyskin1-1/+7
Signal the FW that it can send an HBM enumeration answer immediately, without waiting for FW initialization completion, meaning before all the FW clients are ready and registered. Organize enumeration response options to enum as a byproduct. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-08mei: bus: run rescan on me_clients list changeAlexander Usyskin1-1/+7
Since clients can be now added and removed during runtime we need to run bus rescan whenever me_clients list is modified. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-08mei: hbm: warn about fw-initiated disconnectAlexander Usyskin1-1/+1
The FW can initiate client disconnection only because an error condition, hence it make sense to bump the debug message to the warning level to have an entery in the log. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-08mei: fixed address clients for the new platformsAlexander Usyskin1-0/+4
Enable by default connection to fixed address clients from user-space for skylake and newer platform. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-18mei: fix the KDoc formatingAlexander Usyskin1-3/+3
KDoc function section start with double start: /** instead of /* Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04mei: hbm: fix error in state check logicAlexander Usyskin1-1/+1
Use || instead && in state check. The latter is bogus and leads to following warning: drivers/misc/mei/hbm.c:1212:46: warning: logical ‘and’ of mutually exclusive tests is always false [-Wlogical-op] Fixes: 70ef835c84b3 ("mei: support for dynamic clients") Reported-by: David Binderman <dcb314@hotmail.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: me: d0i3: add d0i3 enter/exit state machineAlexander Usyskin1-1/+12
Rework mei power gating state machine to support entry and exit to and from D0i3 power state. The choice between legacy and D0i3 routines is conditioned on d0i3_supported flag. The patch introduces warning: drivers/misc/mei/hw-me.c:901:12: warning: ‘mei_me_d0i3_enter’ defined but not used [-Wunused-function] it will go away in consequent patch Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: hbm: reorganize the power gating responsesAlexander Usyskin1-15/+70
Before adding support for D0i3 we need to reorganize the hbm pg handling Move HBM PG response code to dedicated functions in order to unclutter hbm command switch. Add check for the right system state before message processing and return -EPROTO in state mismatch case. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: hbm: add new error code MEI_CL_CONN_NOT_ALLOWEDAlexander Usyskin1-0/+2
The device can return error 5 (NOT_ALLOWED) on connection attempt. This error can happen if: 1. An another connection attempt is in progress 2. There is an attempt to connect a fixed (connectionless) client 3. The number of available connections is exceeded (new in HBM 2.0) We should not hit that error unless there is an internal book keeping hiccup except option (3), therefore we translate the error code to errno EBUSY; Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: implement fasync for event notificationTomas Winkler1-4/+2
A process can be informed about client notification also via SIGIO with POLL_PRI event. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: add a handler that waits for notification on eventTomas Winkler1-1/+3
mei_cl_notify_get is to be called by a host client to wait, receive, and ack the event notification. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: add mei_cl_notify_request commandTomas Winkler1-4/+1
Add per client notification request infrastructure that allows client to enable or disable async event notification. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-08-04mei: enable async event notifications only from hbm version 2.0Tomas Winkler1-0/+4
Only FW version 2.0 and newer support the async event notification. For backward compatibility block the feature if the FW version is older then 2.0 Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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