linux-stable.git/drivers/hwtracing/intel_th, branch linux-4.6.y

intel_th: Fix a deadlock in modprobing

2016-08-10T10:54:50+00:00

commit a36aa80f3cb2540fb1dbad6240852de4365a2e82 upstream.

Driver initialization tries to request a hub (GTH) driver module from
its probe callback, resulting in a deadlock.

This patch solves the problem by adding a deferred work for requesting
the hub module.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Kaby Lake PCH-H support

2016-08-10T10:54:49+00:00

commit 7a1a47ce35821b40f5b2ce46379ba14393bc3873 upstream.

This adds Intel(R) Trace Hub PCI ID for Kaby Lake PCH-H.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: Use real device index in the node names

2016-02-20T22:09:14+00:00

Most of the intel_th core supports multiple co-existing TH devices,
except for output device nodes, where intel_th device id is hardcoded
to be zero.

Fix this by fetching the actual intel_th device id from the parent
device's drvdata.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: Set root device's drvdata early

2016-02-20T22:09:14+00:00

Already during the subdevice initialization time, devices will need
to reference Intel TH controller descriptor structure.

This patch moves setting the drvdata from the pci glue to intel_th
core, before subdevices are populated.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: sth: Sanitize packet callback's return values

2016-02-20T22:09:14+00:00

According to the stm class interface, the packet callback should return
an error if it is asked to generate packets that it doesn't support.
When it succeeds, it should return number of bytes consumed from its
payload. Currently, for FLAG packet it mistakenly returns 1.

This patch addresses these issues.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Release resources on read error

2016-02-20T22:09:14+00:00

Right now, reading from msc character device will leak its's user count
on read error.

This patch makes sure resources are released when there is no data left
to read from the buffer.

Signed-off-by: Laurent FERT 
Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Fix offset for wrapped block

2016-02-20T22:09:14+00:00

Fix offset for the second pass on the wrapped block when iterating over
memory in multi-block mode, otherwise wrong part of the block will get
copied.

Signed-off-by: Laurent FERT 
Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: Update scratchpad bits according to enabled output activity

2016-02-20T22:09:14+00:00

Intel TH implements a scratchpad register to indicate to the firmware
and external debuggers what trace configuration is enabled so that
everybody plays nicely together. The register is a bit field and the
bit assignment convention is described in the developer's manual.

This patch enables the driver to automatically set scratchpad register
bits according to the output configuration that's enabled.

Based on work by Yann Fouassier.

Signed-off-by: Yann Fouassier 
Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: gth: Remove commented-out code

2016-02-20T22:09:14+00:00

There's a commented-out function in the GTH driver that's a leftover
from previous versions of the driver, where we tried to inherit the
pre-existing configuration, which didn't prove to be a sound idea.

This patch removes the function. No functional changes.

Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman

intel_th: Depend on HAS_IOMEM

2016-02-20T22:09:14+00:00

This driver requires io memory to operate, so don't even consider it
for NO_IOMEM architectures.

Reported-by: Richard Weinberger 
Signed-off-by: Alexander Shishkin 
Signed-off-by: Greg Kroah-Hartman