kernel.git/drivers/misc/mei/mei_dev.h, branch linux-4.17.y

mei: limit the number of queued writes

2018-03-14T18:33:13Z

Limit the number of queued writes per client. Writes above this threshold are blocked till place in the transmit queue is available. The limit is configurable via sysfs and defaults to 50. The implementation should provide blocking I/O behavior. Prior to this change one would end up in the hands of OOM. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: make module referencing local to the bus.c

2018-03-14T18:33:13Z

Module reference counting is relevant only to the mei client devices. Make the implementation clean and move it to bus.c Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: make mei_cl_bus_rescan static

2017-05-25T16:24:03Z

mei_cl_bus_rescan is used only in bus.c, so make it local to the file and mark static. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: drop amthif internal client

2017-04-08T15:38:25Z

AMTHIF has special support in the mei drive, it handles multiplexing multiple user space connection above single me client connection. Since there is no additional addressing information there is a strict requirement on the traffic order on each connection and on the "read after write" order within the connection. This creates a lot of complexity mostly because the other client types do not necessarily fall under the same restriction. After carefully studying the use of the AMTHIF client, we came to conclusion that the multiplexing is not really utilized by any application and we may safely remove that support and significantly simplify the driver. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: replace callback structures used as list head by list_head

2017-01-31T10:07:43Z

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 Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: bus: prevent hardware module unload if device on bus is active

2017-01-31T10:07:43Z

The hardware module should not be unloaded if the bus has active devices. Get get_/put_ bus parent module upon client device connection/disconnection, to prevent the hardware managing module to disappear underneath. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: bus: enable OS version only for SPT and newer

2017-01-11T06:43:57Z

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 Signed-off-by: Tomas Winkler Tested-by: Jan Niehusmann Signed-off-by: Greg Kroah-Hartman

mei: bus: enable non-blocking RX

2016-12-06T10:05:46Z

Enable non-blocking receive for drivers on mei bus, this allows checking for data availability by mei client drivers. This is most effective for fixed address clients, that lacks flow control. This function adds new API function mei_cldev_recv_nonblock(), it retuns -EGAIN if function will block. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: synchronize irq before initiating a reset.

2016-12-06T10:03:22Z

We need to synchronize irqs before issuing reset to make sure that the clients communication is concluded and doesn't leak to the reset flow and confusing the state machine. This issue is happening during suspend/resume stress testing. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: introduce host client uninitialized state

2016-11-17T15:37:49Z

Introduce a new host client state, MEI_FILE_UNINITIALIZED, to distinguish client objects that was unlinked, but not destroyed and can be linked again. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman