All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH v2 00/18] clocksource/arch_timer: Errata workaround infrastructure rework
@ 2017-03-20 17:48 ` Marc Zyngier
  0 siblings, 0 replies; 88+ messages in thread
From: Marc Zyngier @ 2017-03-20 17:48 UTC (permalink / raw)
  To: linux-arm-kernel, linux-kernel
  Cc: Mark Rutland, Catalin Marinas, Daniel Lezcano, Will Deacon,
	Scott Wood, Hanjun Guo, Ding Tianhong, dann frazier

It has recently become obvious that a number of arm64 systems have
been blessed with a set of timers that are slightly less than perfect,
and require a bit of hand-holding. We already have a bunch of
errata-specific code to deal with this, but as we're adding more
potential detection methods (DT, ACPI, capability), things are getting
a bit out of hands.

Instead of adding more ad-hoc fixes to an already difficult code base,
let's give ourselves a bit of an infrastructure that can deal with
this and hide most of the uggliness behind frendly accessors.

The series is structured as such:

- A bunch of arm64 specific patches that allow the rest of the
  workaround infrastructure to be built upon (such as being able to
  trap userspace access to the virtual counter). These are now
  separate in order to allow the creation of a shared branch between
  the arm64 and clocksource trees.

- The following patches rework the existing workarounds, allowing
  errata to be matched using a given detection method

- Another patch allows a workaround to affect a subset of the CPUs,
  and not the whole system

- We then work around a Cortex-A73 erratum, whose counter can return a
  wrong value if read while crossing a 32bit boundary

- Finally, we add some ACPI-specific workarounds for HiSilicon
  platforms that have the HISILICON_ERRATUM_161010101 defect.

Note that so far, we only deal with arm64. Once the infrastructure is
agreed upon, we can look at generalizing it (to some extent) to 32bit
ARM (typical use case would be a 32bit guest running on an affected
host).

* From v1:
  - Addressed Hanjun and Mark review comments
  - Moved arm64 specific patches to the beginning of the series,
    leaving the clocksource patches at the end, resulting in an extra
    patch.
  - Added RBs, TBs, and Acks.

Marc Zyngier (18):
  arm64: Allow checking of a CPU-local erratum
  arm64: Add CNTVCT_EL0 trap handler
  arm64: Define Cortex-A73 MIDR
  arm64: cpu_errata: Allow an erratum to be match for all revisions of a
    core
  arm64: cpu_errata: Add capability to advertise Cortex-A73 erratum
    858921
  arm64: arch_timer: Add infrastructure for multiple erratum detection
    methods
  arm64: arch_timer: Add erratum handler for globally defined capability
  arm64: arch_timer: Add erratum handler for CPU-specific capability
  arm64: arch_timer: Move arch_timer_reg_read/write around
  arm64: arch_timer: Get rid of erratum_workaround_set_sne
  arm64: arch_timer: Rework the set_next_event workarounds
  arm64: arch_timer: Make workaround methods optional
  arm64: arch_timer: Allows a CPU-specific erratum to only affect a
    subset of CPUs
  arm64: arch_timer: Move clocksource_counter and co around
  arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled
  arm64: arch_timer: Workaround for Cortex-A73 erratum 858921
  arm64: arch_timer: Allow erratum matching with ACPI OEM information
  arm64: arch_timer: Add HISILICON_ERRATUM_161010101 ACPI matching data

 Documentation/arm64/silicon-errata.txt |   1 +
 arch/arm64/include/asm/arch_timer.h    |  44 ++-
 arch/arm64/include/asm/cpucaps.h       |   3 +-
 arch/arm64/include/asm/cputype.h       |   2 +
 arch/arm64/include/asm/esr.h           |   2 +
 arch/arm64/kernel/cpu_errata.c         |  15 +
 arch/arm64/kernel/cpufeature.c         |  13 +-
 arch/arm64/kernel/traps.c              |  14 +
 drivers/clocksource/Kconfig            |  11 +
 drivers/clocksource/arm_arch_timer.c   | 535 +++++++++++++++++++++++----------
 10 files changed, 471 insertions(+), 169 deletions(-)

-- 
2.11.0

^ permalink raw reply	[flat|nested] 88+ messages in thread

end of thread, other threads:[~2017-03-30  9:28 UTC | newest]

Thread overview: 88+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-20 17:48 [PATCH v2 00/18] clocksource/arch_timer: Errata workaround infrastructure rework Marc Zyngier
2017-03-20 17:48 ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 01/18] arm64: Allow checking of a CPU-local erratum Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22  9:22   ` Daniel Lezcano
2017-03-22  9:22     ` Daniel Lezcano
2017-03-20 17:48 ` [PATCH v2 02/18] arm64: Add CNTVCT_EL0 trap handler Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 03/18] arm64: Define Cortex-A73 MIDR Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 04/18] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22 14:57   ` Daniel Lezcano
2017-03-22 14:57     ` Daniel Lezcano
2017-03-20 17:48 ` [PATCH v2 05/18] arm64: cpu_errata: Add capability to advertise Cortex-A73 erratum 858921 Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22 15:01   ` Daniel Lezcano
2017-03-22 15:01     ` Daniel Lezcano
2017-03-20 17:48 ` [PATCH v2 06/18] arm64: arch_timer: Add infrastructure for multiple erratum detection methods Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22 15:41   ` Daniel Lezcano
2017-03-22 15:41     ` Daniel Lezcano
2017-03-22 15:53     ` Marc Zyngier
2017-03-22 15:53       ` Marc Zyngier
2017-03-22 15:59     ` Marc Zyngier
2017-03-22 15:59       ` Marc Zyngier
2017-03-22 16:52       ` Daniel Lezcano
2017-03-22 16:52         ` Daniel Lezcano
2017-03-23 17:30       ` Daniel Lezcano
2017-03-23 17:30         ` Daniel Lezcano
2017-03-24 13:51         ` Marc Zyngier
2017-03-24 13:51           ` Marc Zyngier
2017-03-27  7:56           ` Daniel Lezcano
2017-03-27  7:56             ` Daniel Lezcano
2017-03-28 13:07             ` Marc Zyngier
2017-03-28 13:07               ` Marc Zyngier
2017-03-28 13:34               ` Daniel Lezcano
2017-03-28 13:34                 ` Daniel Lezcano
2017-03-28 14:07                 ` Marc Zyngier
2017-03-28 14:07                   ` Marc Zyngier
2017-03-28 14:36                   ` Daniel Lezcano
2017-03-28 14:36                     ` Daniel Lezcano
2017-03-28 14:48                     ` Marc Zyngier
2017-03-28 14:48                       ` Marc Zyngier
2017-03-28 14:55                       ` Daniel Lezcano
2017-03-28 14:55                         ` Daniel Lezcano
2017-03-28 15:38                         ` Marc Zyngier
2017-03-28 15:38                           ` Marc Zyngier
2017-03-29 14:27                           ` Daniel Lezcano
2017-03-29 14:27                             ` Daniel Lezcano
2017-03-29 14:56                             ` Marc Zyngier
2017-03-29 14:56                               ` Marc Zyngier
2017-03-29 15:12                               ` Daniel Lezcano
2017-03-29 15:12                                 ` Daniel Lezcano
2017-03-24 17:48   ` dann frazier
2017-03-24 17:48     ` dann frazier
2017-03-24 18:00     ` Marc Zyngier
2017-03-24 18:00       ` Marc Zyngier
2017-03-30  9:28       ` Daniel Lezcano
2017-03-30  9:28         ` Daniel Lezcano
2017-03-20 17:48 ` [PATCH v2 07/18] arm64: arch_timer: Add erratum handler for globally defined capability Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 08/18] arm64: arch_timer: Add erratum handler for CPU-specific capability Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 09/18] arm64: arch_timer: Move arch_timer_reg_read/write around Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22 15:47   ` Daniel Lezcano
2017-03-22 15:47     ` Daniel Lezcano
2017-03-20 17:48 ` [PATCH v2 10/18] arm64: arch_timer: Get rid of erratum_workaround_set_sne Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 11/18] arm64: arch_timer: Rework the set_next_event workarounds Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 12/18] arm64: arch_timer: Make workaround methods optional Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 13/18] arm64: arch_timer: Allows a CPU-specific erratum to only affect a subset of CPUs Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 14/18] arm64: arch_timer: Move clocksource_counter and co around Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 15/18] arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 16/18] arm64: arch_timer: Workaround for Cortex-A73 erratum 858921 Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 17/18] arm64: arch_timer: Allow erratum matching with ACPI OEM information Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 18/18] arm64: arch_timer: Add HISILICON_ERRATUM_161010101 ACPI matching data Marc Zyngier
2017-03-20 17:48   ` Marc Zyngier
2017-03-22 13:56 ` [PATCH v2 00/18] clocksource/arch_timer: Errata workaround infrastructure rework Ding Tianhong
2017-03-22 13:56   ` Ding Tianhong

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.