kernel/drivers/hwtracing/intel_th/msu.h, branch linux-6.9.y

Merge 5.3-rc5 into char-misc-next

2019-08-19T05:11:53Z

We need the char/misc fixes in here as well. Signed-off-by: Greg Kroah-Hartman

intel_th: Use the correct style for SPDX License Identifier

2019-07-30T17:41:53Z

This patch corrects the SPDX License Identifier style in header files related to Drivers for Intel(R) Trace Hub controller. For C header files Documentation/process/license-rules.rst mandates C-like comments (opposed to C source files where C++ style should be used) Changes made by using a script provided by Joe Perches here: https://lkml.org/lkml/2019/2/7/46 Suggested-by: Joe Perches Signed-off-by: Nishad Kamdar Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Introduce buffer interface

2019-07-25T11:03:18Z

Introduces a concept of external buffers, which is a mechanism for creating trace sinks that would receive trace data from MSC buffers and transfer it elsewhere. A external buffer can implement its own window allocation/deallocation if it has to. It must provide a callback that's used to notify it when a window fills up, so that it can then start a DMA transaction from that window 'elsewhere'. This window remains in a 'locked' state and won't be used for storing new trace data until the buffer 'unlocks' it with a provided API call, at which point the window can be used again for storing trace data. This relies on a functional "last block" interrupt, so not all versions of Trace Hub can use this feature, which does not reflect on existing users. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20190705141425.19894-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Correct the block wrap detection

2019-05-03T16:16:21Z

In multi window mode the MSU will set "window wrap" bit to indicate block wrapping as well. Take this into account when checking data blocks. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman

intel_th: msu: Start handling IRQs

2019-05-03T16:14:30Z

We intend to use the interrupt to detect Last Block condition in the MSU driver, which we can use for double-buffering software-managed data transfers. Add an interrupt handler to the MSU driver. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman

intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate

2018-03-28T15:47:19Z

This adds SPDX GPL-2.0 header to the Trace Hub driver and removes the GPLv2 boilerplate text. Signed-off-by: Alexander Shishkin

intel_th: Add Memory Storage Unit driver

2015-10-04T19:28:58Z

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