linux-toradex.git/drivers/hwtracing/intel_th, branch v4.4.73

intel_th: Fix a deadlock in modprobing

2016-08-10T09:49:30+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

2016-08-10T09:49:30+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: Check for NULL instead of ERR_PTR

2015-10-17T06:25:48+00:00

devm_ioremap() returns NULL on error, it doesn't return an ERR_PTR,
which is what the current code does. This patch corrects these
checks.

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

intel_th: Fix integer mismatch warnings

2015-10-10T19:24:47+00:00

Use unsigned long in place of size_t to operate on buffer sizes and
offsets to clean up the 32 bit build.

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

intel_th: Add PTI output driver

2015-10-04T19:28:58+00:00

Parallel Trace Interface (PTI) unit is a trace output device that sends
data over a PTI port.

The driver provides interfaces to configure bus width, bus clock divider
and mode. Tracing is enabled via output device's "active" attribute.

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

intel_th: Add Memory Storage Unit driver

2015-10-04T19:28:58+00:00

Memory Storage Unit (MSU) is a trace output device that collects trace
data to system memory. It consists of 2 independent Memory Storage
Controllers (MSCs).

This driver provides userspace interfaces to configure in-memory tracing
parameters, such as contiguous (high-order allocation) buffer or multiblock
(scatter list) buffer mode, wrapping (data overwrite) and number and sizes
of windows in multiblock mode. Userspace can read the buffers via mmap()ing
or read()ing of the corresponding device node.

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

intel_th: Add Software Trace Hub driver

2015-10-04T19:28:58+00:00

Software Trace Hub (STH) is a trace source device in the Intel TH
architecture, it generates data that then goes through the switch into
one or several output ports.

STH collects data from software sources using the stm device class
abstraction.

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

intel_th: Add Global Trace Hub driver

2015-10-04T19:28:58+00:00

Global Trace Hub (GTH) is the central component of Intel TH architecture;
it carries out switching between the trace sources and trace outputs, can
enable/disable tracing, perform STP encoding, internal buffering, control
backpressure from outputs to sources and so on.

This property is also reflected in the software model; GTH (switch) driver
is required for the other subdevices to probe, because it matches trace
output devices against its output ports and configures them accordingly.

It also implements an interface for output ports to request trace enabling
or disabling and a few other useful things.

For userspace, it provides an attribute group "masters", which allows
configuration of per-master trace output destinations for up to master 255
and "256+" meaning "masters 256 and above". It also provides an attribute
group to discover and configure some of the parameters of its output ports,
called "outputs". Via these the user can set up data retention policy for
an individual output port or check if it is in reset state.

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

intel_th: Add pci glue layer for Intel(R) Trace Hub

2015-10-04T19:28:58+00:00

This patch adds basic support for PCI-based Intel TH devices. It requests
2 bars (configuration registers for the subdevices and STH channel MMIO
region) and calls into Intel TH core code to create the bus with subdevices
etc.

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

intel_th: Add driver infrastructure for Intel(R) Trace Hub devices

2015-10-04T19:28:58+00:00

Intel(R) Trace Hub (TH) is a set of hardware blocks (subdevices) that
produce, switch and output trace data from multiple hardware and
software sources over several types of trace output ports encoded
in System Trace Protocol (MIPI STPv2) and is intended to perform
full system debugging.

For these subdevices, we create a bus, where they can be discovered
and configured by userspace software.

This patch creates this bus infrastructure, three types of devices
(source, output, switch), resource allocation, some callback mechanisms
to facilitate communication between the subdevices' drivers and some
common sysfs attributes.

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