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Message-Id: <1427056381-27614-1-git-send-email-alexander.shishkin@linux.intel.com> Date: Sun, 22 Mar 2015 22:32:50 +0200 From: Alexander Shishkin <alexander.shishkin@...ux.intel.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org, pebolle@...cali.nl, peter.lachner@...el.com, norbert.schulz@...el.com, keven.boell@...el.com, yann.fouassier@...el.com, laurent.fert@...el.com, Alexander Shishkin <alexander.shishkin@...ux.intel.com> Subject: [PATCH v2 00/11] Introduce Intel Trace Hub support Hi Greg and everybody, Here's a patchset adding support for Intel Trace Hub (TH) [1] to the kernel. Full description follows the changelog. Changes since v1: * fixed Kconfig whitespaces and removed defaults per comments from Paul Bolle, * addressed comments from Joe Perches. Changes since v0: * filter-branch'ed everything under drivers/hwtracing where Mathieu is also moving coresight drivers, * added some more comments to the stm class code to address Mathieu's questions, * fixed CONFIG_STM=m case, which failed to build in the previous version as pointed out by Paul Bolle, * fixed a rather embarrassing memory leak in the error path of stm_char_policy_set_ioctl(), * added ioctl() callback to struct stm_data so that downstream stm drivers can serve their own commands on top of the same file descriptor, as suggested by Mathieu. Intel Trace Hub (TH) is a set of hardware blocks 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. The first part of this patchset introduces an abstraction for STM devices, or the devices that combine trace data from multiple trace sources into a STP trace stream. It provides a generic interface for software writers to send their trace data and also solves the problem of mapping STP master/channel asignments to trace sources between the system under tracing and the STP decoder on the debug host end. This part is also useful for the Coresight STM driver as it uses a similar interface and has the same channel mapping problem. The remainder of the patchset is Intel TH support. The core part is platform independant and is called into by glue layers such as the pci driver that follows. The core provides a bus, on which Intel TH subdevices are allocated. Each subdevice has its own driver. Subdevices are divided into 3 types: sources, outputs and a switch (there's usually just one). The latter is the central component in this scheme of things and is required for other drivers to load and function. Other drivers, however, are optional. Sources are producers of trace data. Outputs are means of exporting the resulting STP trace to the debug host via trace ports or system memory. All configuration is done via sysfs and doesn't require any specific userspace beyond a shell. Currently supported Intel TH subdevices are Software Trace Hub (STH, source), Memory Storage Unit (MSU, output), Parallel Tracing Interface unit (PTI, output), Global Trace Hub (GTH, switch). Support for other subdevices can be added later. Also this patchset adds MAINTAINERS entries for stm class and Intel TH code. [1] https://software.intel.com/sites/default/files/managed/d3/3c/intel-th-developer-manual.pdf Alexander Shishkin (11): stm class: Introduce an abstraction for System Trace Module devices MAINTAINERS: add an entry for System Trace Module device class stm class: dummy_stm: Add dummy driver for testing stm class stm class: stm_console: Add kernel-console-over-stm driver intel_th: Add driver infrastructure for Intel Trace Hub devices intel_th: Add pci glue layer for Intel Trace Hub intel_th: Add Global Trace Hub driver intel_th: Add Software Trace Hub driver intel_th: Add Memory Storage Unit driver intel_th: Add PTI output driver MAINTAINERS: add an entry for Intel(R) Trace Hub Documentation/ABI/testing/configfs-stp-policy | 44 + .../ABI/testing/sysfs-bus-intel_th-devices-gth | 43 + .../ABI/testing/sysfs-bus-intel_th-devices-msc | 33 + .../ABI/testing/sysfs-bus-intel_th-devices-pti | 24 + .../ABI/testing/sysfs-bus-intel_th-output-devices | 13 + Documentation/ABI/testing/sysfs-class-stm | 14 + Documentation/ABI/testing/sysfs-class-stm_source | 11 + Documentation/trace/intel_th.txt | 99 ++ Documentation/trace/stm.txt | 77 ++ MAINTAINERS | 14 + drivers/Kconfig | 4 + drivers/Makefile | 2 + drivers/hwtracing/intel_th/Kconfig | 72 + drivers/hwtracing/intel_th/Makefile | 18 + drivers/hwtracing/intel_th/core.c | 692 ++++++++++ drivers/hwtracing/intel_th/debug.c | 36 + drivers/hwtracing/intel_th/debug.h | 34 + drivers/hwtracing/intel_th/gth.c | 672 ++++++++++ drivers/hwtracing/intel_th/gth.h | 63 + drivers/hwtracing/intel_th/intel_th.h | 244 ++++ drivers/hwtracing/intel_th/msu.c | 1403 ++++++++++++++++++++ drivers/hwtracing/intel_th/msu.h | 115 ++ drivers/hwtracing/intel_th/pci.c | 82 ++ drivers/hwtracing/intel_th/pti.c | 252 ++++ drivers/hwtracing/intel_th/pti.h | 29 + drivers/hwtracing/intel_th/sth.c | 215 +++ drivers/hwtracing/intel_th/sth.h | 37 + drivers/hwtracing/stm/Kconfig | 25 + drivers/hwtracing/stm/Makefile | 7 + drivers/hwtracing/stm/console.c | 80 ++ drivers/hwtracing/stm/core.c | 897 +++++++++++++ drivers/hwtracing/stm/dummy_stm.c | 60 + drivers/hwtracing/stm/policy.c | 467 +++++++ drivers/hwtracing/stm/stm.h | 79 ++ include/linux/stm.h | 102 ++ include/uapi/linux/stm.h | 47 + 36 files changed, 6106 insertions(+) create mode 100644 Documentation/ABI/testing/configfs-stp-policy create mode 100644 Documentation/ABI/testing/sysfs-bus-intel_th-devices-gth create mode 100644 Documentation/ABI/testing/sysfs-bus-intel_th-devices-msc create mode 100644 Documentation/ABI/testing/sysfs-bus-intel_th-devices-pti create mode 100644 Documentation/ABI/testing/sysfs-bus-intel_th-output-devices create mode 100644 Documentation/ABI/testing/sysfs-class-stm create mode 100644 Documentation/ABI/testing/sysfs-class-stm_source create mode 100644 Documentation/trace/intel_th.txt create mode 100644 Documentation/trace/stm.txt create mode 100644 drivers/hwtracing/intel_th/Kconfig create mode 100644 drivers/hwtracing/intel_th/Makefile create mode 100644 drivers/hwtracing/intel_th/core.c create mode 100644 drivers/hwtracing/intel_th/debug.c create mode 100644 drivers/hwtracing/intel_th/debug.h create mode 100644 drivers/hwtracing/intel_th/gth.c create mode 100644 drivers/hwtracing/intel_th/gth.h create mode 100644 drivers/hwtracing/intel_th/intel_th.h create mode 100644 drivers/hwtracing/intel_th/msu.c create mode 100644 drivers/hwtracing/intel_th/msu.h create mode 100644 drivers/hwtracing/intel_th/pci.c create mode 100644 drivers/hwtracing/intel_th/pti.c create mode 100644 drivers/hwtracing/intel_th/pti.h create mode 100644 drivers/hwtracing/intel_th/sth.c create mode 100644 drivers/hwtracing/intel_th/sth.h create mode 100644 drivers/hwtracing/stm/Kconfig create mode 100644 drivers/hwtracing/stm/Makefile create mode 100644 drivers/hwtracing/stm/console.c create mode 100644 drivers/hwtracing/stm/core.c create mode 100644 drivers/hwtracing/stm/dummy_stm.c create mode 100644 drivers/hwtracing/stm/policy.c create mode 100644 drivers/hwtracing/stm/stm.h create mode 100644 include/linux/stm.h create mode 100644 include/uapi/linux/stm.h -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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