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2017-06-09hwtracing: intel_th: use dev_groups and not dev_attrs for bus_typeGreg Kroah-Hartman1-1/+0
The dev_attrs field has long been "depreciated" and is finally being removed, and as this driver isn't even using it, just drop the NULL setting, it is pointless. Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-05-08drivers/hwtracing/intel_th/msu.c: use set_memory.h headerLaura Abbott1-1/+3
set_memory_* functions have moved to set_memory.h. Switch to this explicitly. Link: http://lkml.kernel.org/r/1488920133-27229-9-git-send-email-labbott@redhat.com Signed-off-by: Laura Abbott <labbott@redhat.com> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-03-15intel_th: pci: Add Gemini Lake supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Gemini Lake SOC. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2017-03-15intel_th: pci: Add Denverton SOC supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Denverton SOC. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2017-03-15intel_th: Don't leak module refcount on failure to activateAlexander Shishkin1-1/+3
Output 'activation' may fail for the reasons of the output driver, for example, if msc's buffer is not allocated. We forget, however, to drop the module reference in this case. So each attempt at activation in this case leaks a reference, preventing the module from ever unloading. This patch adds the missing module_put() in the activation error path. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: stable@vger.kernel.org # v4.8+
2017-02-24mm, fs: reduce fault, page_mkwrite, and pfn_mkwrite to take only vmfDave Jiang1-3/+3
->fault(), ->page_mkwrite(), and ->pfn_mkwrite() calls do not need to take a vma and vmf parameter when the vma already resides in vmf. Remove the vma parameter to simplify things. [arnd@arndb.de: fix ARM build] Link: http://lkml.kernel.org/r/20170125223558.1451224-1-arnd@arndb.de Link: http://lkml.kernel.org/r/148521301778.19116.10840599906674778980.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-15Merge tag 'trace-v4.10' of ↵Linus Torvalds1-4/+7
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: "This release has a few updates: - STM can hook into the function tracer - Function filtering now supports more advance glob matching - Ftrace selftests updates and added tests - Softirq tag in traces now show only softirqs - ARM nop added to non traced locations at compile time - New trace_marker_raw file that allows for binary input - Optimizations to the ring buffer - Removal of kmap in trace_marker - Wakeup and irqsoff tracers now adhere to the set_graph_notrace file - Other various fixes and clean ups" * tag 'trace-v4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (42 commits) selftests: ftrace: Shift down default message verbosity kprobes/trace: Fix kprobe selftest for newer gcc tracing/kprobes: Add a helper method to return number of probe hits tracing/rb: Init the CPU mask on allocation tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results tracing/fgraph: Have wakeup and irqsoff tracers ignore graph functions too fgraph: Handle a case where a tracer ignores set_graph_notrace tracing: Replace kmap with copy_from_user() in trace_marker writing ftrace/x86_32: Set ftrace_stub to weak to prevent gcc from using short jumps to it tracing: Allow benchmark to be enabled at early_initcall() tracing: Have system enable return error if one of the events fail tracing: Do not start benchmark on boot up tracing: Have the reg function allow to fail ring-buffer: Force rb_end_commit() and rb_set_commit_to_write() inline ring-buffer: Froce rb_update_write_stamp() to be inlined ring-buffer: Force inline of hotpath helper functions tracing: Make __buffer_unlock_commit() always_inline tracing: Make tracepoint_printk a static_key ring-buffer: Always inline rb_event_data() ring-buffer: Make rb_reserve_next_event() always inlined ...
2016-11-22intel_th: Mark sth_stm_packet() with notraceChunyan Zhang1-4/+7
If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be writen to sink via STM, all functions that related to writing data packets to STM should be marked 'notrace' to avoid being traced by Ftrace, otherwise the program would stall into an endless loop. Link: http://lkml.kernel.org/r/1479715043-6534-5-git-send-email-zhang.chunyan@linaro.org Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-11-18intel_th: gth: Handle host mode correctlyAlexander Shishkin1-2/+24
When detecting host debugger mode either though a module option or via the scratchpad register, do not export any configuration or capture related attributes to userspace and refuse attempts by the output drivers to configure output ports. This way, GTH can still act as a hub and ensure that the other components that rely on its presence continue to function properly, namely the source devices. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-11-18intel_th: Support Host Debugger mode of operationAlexander Shishkin2-8/+22
This patch adds a 'host_mode' module option to enable host-driven operational mode in the driver. In this mode, the driver does not perform trace configuration or enable trace capture, but still provides all the means necessary for software trace sources to write their data to the Trace Hub. This means that the debug host takes care of all the configuration and enabling and we do not interfere. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-11-18intel_th: Constify subdevicesAlexander Shishkin1-1/+1
The subdevice array consists of immutable objects, make them const. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-07-15Merge tag 'stm-for-greg-20160714' of ↵Greg Kroah-Hartman3-1/+42
git://git.kernel.org/pub/scm/linux/kernel/git/ash/stm into char-misc-next Alexander writes: intel_th: Fixes -t://git.kernel.org/pub/scm/linux/kernel/git/ash/stm.git tags/stm-for-greg-20160714 stable These are: * a fix for a modprobe time deadlock * a new PCI ID for Kaby Lake PCH-H
2016-07-14intel_th: pci: Add Kaby Lake PCH-H supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Kaby Lake PCH-H. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: <stable@vger.kernel.org>
2016-07-14intel_th: Fix a deadlock in modprobingAlexander Shishkin2-1/+37
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 <alexander.shishkin@linux.intel.com> Cc: <stable@vger.kernel.org> # 4.4.x-
2016-07-01intel_th: Document output device callbacksAlexander Shishkin1-0/+3
'output' type device callbacks are missing from the kerneldoc description of the 'intel_th_driver' structure. Fix this. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-07-01intel_th: gth: Fix a source commentAlexander Shishkin1-1/+1
There's a kerneldoc comment that'd been derived from another one by way of copying-and-pasting but hadn't been subsequently amended to reflect the purpose of the function. Fix this. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-07-01intel_th: Add runtime power management handlingAlexander Shishkin2-10/+60
Currently, an Intel TH (pci) device will be always active, because the devices on the 'intel_th' bus don't implement runtime pm to track their usage. To address this, this patch adds runtime pm support to the 'intel_th' bus and some additional bits for the hub. The 'output' type device is in use while a capture is active; the 'source' type device (STH) relies on its child stm class device for runtime pm tracking. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-05-20Merge tag 'char-misc-4.7-rc1' of ↵Linus Torvalds5-55/+107
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char / misc driver updates from Greg KH: "Here's the big char and misc driver update for 4.7-rc1. Lots of different tiny driver subsystems have updates here with new drivers and functionality. Details in the shortlog. All have been in linux-next with no reported issues for a while" * tag 'char-misc-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (125 commits) mcb: Delete num_cells variable which is not required mcb: Fixed bar number assignment for the gdd mcb: Replace ioremap and request_region with the devm version mcb: Implement bus->dev.release callback mcb: export bus information via sysfs mcb: Correctly initialize the bus's device mei: bus: call mei_cl_read_start under device lock coresight: etb10: adjust read pointer only when needed coresight: configuring ETF in FIFO mode when acting as link coresight: tmc: implementing TMC-ETF AUX space API coresight: moving struct cs_buffers to header file coresight: tmc: keep track of memory width coresight: tmc: make sysFS and Perf mode mutually exclusive coresight: tmc: dump system memory content only when needed coresight: tmc: adding mode of operation for link/sinks coresight: tmc: getting rid of multiple read access coresight: tmc: allocating memory when needed coresight: tmc: making prepare/unprepare functions generic coresight: tmc: splitting driver in ETB/ETF and ETR components coresight: tmc: cleaning up header file ...
2016-05-19mm: rename _count, field of the struct page, to _refcountJoonsoo Kim1-1/+1
Many developers already know that field for reference count of the struct page is _count and atomic type. They would try to handle it directly and this could break the purpose of page reference count tracepoint. To prevent direct _count modification, this patch rename it to _refcount and add warning message on the code. After that, developer who need to handle reference count will find that field should not be accessed directly. [akpm@linux-foundation.org: fix comments, per Vlastimil] [akpm@linux-foundation.org: Documentation/vm/transhuge.txt too] [sfr@canb.auug.org.au: sync ethernet driver changes] Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Sunil Goutham <sgoutham@cavium.com> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Manish Chopra <manish.chopra@qlogic.com> Cc: Yuval Mintz <yuval.mintz@qlogic.com> Cc: Tariq Toukan <tariqt@mellanox.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-19intel_th: pci: Add Broxton-M SOC supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Broxton-M SOC. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: msu: Release resources on removalAlexander Shishkin1-0/+12
Do release the resources when msu subdevice gets removed: stop the capture if it is active (which is still possible even though the module in pinned) and free the capture buffers. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: msu: Set fops::owner to prevent module from unloadingAlexander Shishkin1-0/+1
Right now it's possible to unload the msu driver while its character device is open. Prevent it by setting fops::owner, which will result in the module reference being held while the device node is open. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: Hold output driver module reference while capture is activeAlexander Shishkin1-0/+5
Right now it's possible to unload the output subdevice's driver while the capture to this output is active. Prevent this by holding the output driver's module reference. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: msu: Serialize enabling/disablingAlexander Shishkin1-43/+49
In order to guarantee that readers don't race with trace enabling, both should happen under the same mutex. Having two mutexes seems like an overkill, considering that because of the above, they'll have to be acquired together, around trace enabling and char device opening. This patch makes both buffer accesses and readers serialize on msc::buf_mutex and makes sure that 'enabled' flag accesses are also serialized on it. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: Fix activating a subdevice without a driverAlexander Shishkin2-2/+13
If output subdevice driver is not loaded, activating it will try to call its ->activate method and crash. Fix this by explicitly checking for the driver. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: pti: Create sysfs attributes using core driver's facilityAlexander Shishkin1-6/+1
The core intel_th driver allows subdevices to bring in their sysfs attributes. Use this instead of taking care of them in probe and remove. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: msu: Create sysfs attributes using core driver's facilityAlexander Shishkin1-5/+1
The core intel_th driver allows subdevices to bring in their sysfs attributes. Use this instead of taking care of them in probe and remove. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: Allow subdevice drivers to bring in own attribute groupsAlexander Shishkin2-0/+15
Some subdevices (MSU, PTI) need to register their own driver-specific attribute groups. Provide a way for those to pass their attribute groups to the core driver in their driver structure so that the core can take care of creating and removing them. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: msu: Handle kstrndup() failureAlexander Shishkin1-0/+5
Currently, the nr_pages attribute store does not check if kstrndup() succeeded. Fix this. Reported-by: Alan Cox <alan.cox@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08intel_th: pti: Do remove sysfs group on device removalAlexander Shishkin1-0/+1
Right now, the PTI output driver forgets to clean up its sysfs group when it gets removed. Fix this. Reported-by: Alan Cox <alan.cox@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-02-20intel_th: Use real device index in the node namesAlexander Shishkin1-3/+20
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: Set root device's drvdata earlyAlexander Shishkin2-2/+2
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: sth: Sanitize packet callback's return valuesAlexander Shishkin1-3/+8
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: msu: Release resources on read errorLaurent FERT1-4/+3
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 <laurent.fert@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: msu: Fix offset for wrapped blockLaurent FERT1-1/+1
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 <laurent.fert@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: Update scratchpad bits according to enabled output activityAlexander Shishkin4-4/+59
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 <yann.fouassier@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: gth: Remove commented-out codeAlexander Shishkin1-18/+0
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20intel_th: Depend on HAS_IOMEMAlexander Shishkin1-1/+1
This driver requires io memory to operate, so don't even consider it for NO_IOMEM architectures. Reported-by: Richard Weinberger <richard@nod.at> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-07intel_th: pci: Add Broxton SOC supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Broxton SOC. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-07intel_th: pci: Add Apollo Lake SOC supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Apollo Lake SOC. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-07intel_th: INTEL_TH should depend on HAS_DMAGeert Uytterhoeven1-0/+1
If NO_DMA=y: ERROR: "dma_free_coherent" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined! ERROR: "dma_alloc_coherent" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined! ERROR: "dma_supported" [drivers/hwtracing/intel_th/intel_th.ko] undefined! Add a dependency on HAS_DMA to fix this. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-16intel_th: Check for NULL instead of ERR_PTRDan Carpenter4-10/+10
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 <dan.carpenter@oracle.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-10intel_th: Fix integer mismatch warningsAlexander Shishkin1-1/+1
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add PTI output driverAlexander Shishkin4-0/+293
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add Memory Storage Unit driverAlexander Shishkin4-0/+1638
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 <laurent.fert@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add Software Trace Hub driverAlexander Shishkin4-0/+314
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add Global Trace Hub driverAlexander Shishkin4-0/+785
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 <laurent.fert@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add pci glue layer for Intel(R) Trace HubAlexander Shishkin3-0/+98
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04intel_th: Add driver infrastructure for Intel(R) Trace Hub devicesAlexander Shishkin6-0/+1033
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 <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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