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Revision befb1b3c2703897c5b8ffb0044dc5d0e5f27c5d7 authored by Reinette Chatre on 19 September 2018, 17:29:06 UTC, committed by Thomas Gleixner on 28 September 2018, 20:44:53 UTC 
perf/core: Add sanity check to deal with pinned event failure
 
It is possible that a failure can occur during the scheduling of a
pinned event. The initial portion of perf_event_read_local() contains
the various error checks an event should pass before it can be
considered valid. Ensure that the potential scheduling failure
of a pinned event is checked for and have a credible error.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: acme@kernel.org
Cc: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: dave.hansen@intel.com
Cc: hpa@zytor.com
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/6486385d1f30336e9973b24c8c65f5079543d3d3.1537377064.git.reinette.chatre@intel.com
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ina2xx 
Kernel driver ina2xx
====================

Supported chips:
  * Texas Instruments INA219
    Prefix: 'ina219'
    Addresses: I2C 0x40 - 0x4f
    Datasheet: Publicly available at the Texas Instruments website
               http://www.ti.com/

  * Texas Instruments INA220
    Prefix: 'ina220'
    Addresses: I2C 0x40 - 0x4f
    Datasheet: Publicly available at the Texas Instruments website
               http://www.ti.com/

  * Texas Instruments INA226
    Prefix: 'ina226'
    Addresses: I2C 0x40 - 0x4f
    Datasheet: Publicly available at the Texas Instruments website
               http://www.ti.com/

  * Texas Instruments INA230
    Prefix: 'ina230'
    Addresses: I2C 0x40 - 0x4f
    Datasheet: Publicly available at the Texas Instruments website
               http://www.ti.com/

  * Texas Instruments INA231
    Prefix: 'ina231'
    Addresses: I2C 0x40 - 0x4f
    Datasheet: Publicly available at the Texas Instruments website
               http://www.ti.com/

Author: Lothar Felten <lothar.felten@gmail.com>

Description
-----------

The INA219 is a high-side current shunt and power monitor with an I2C
interface. The INA219 monitors both shunt drop and supply voltage, with
programmable conversion times and filtering.

The INA220 is a high or low side current shunt and power monitor with an I2C
interface. The INA220 monitors both shunt drop and supply voltage.

The INA226 is a current shunt and power monitor with an I2C interface.
The INA226 monitors both a shunt voltage drop and bus supply voltage.

INA230 and INA231 are high or low side current shunt and power monitors
with an I2C interface. The chips monitor both a shunt voltage drop and
bus supply voltage.

The shunt value in micro-ohms can be set via platform data or device tree at
compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
refer to the Documentation/devicetree/bindings/hwmon/ina2xx.txt for bindings
if the device tree is used.

Additionally ina226 supports update_interval attribute as described in
Documentation/hwmon/sysfs-interface. Internally the interval is the sum of
bus and shunt voltage conversion times multiplied by the averaging rate. We
don't touch the conversion times and only modify the number of averages. The
lower limit of the update_interval is 2 ms, the upper limit is 2253 ms.
The actual programmed interval may vary from the desired value.
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