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Date: Mon, 1 Jul 2019 04:25:41 +0000
From: Michael Kelley <mikelley@...rosoft.com>
To: "tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>
CC: Michael Kelley <mikelley@...rosoft.com>,
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Subject: [PATCH v5 0/2] clocksource/drivers: Create new Hyper-V clocksource
driver
This patch series moves Hyper-V clock/timer code to a separate Hyper-V
clocksource driver. Previously, Hyper-V clock/timer code and data
structures were mixed in with other Hyper-V code in the ISA independent
drivers/hv code as well as in ISA dependent code. The new Hyper-V
clocksource driver is ISA agnostic, with a just few dependencies on
ISA specific functions. The patch series does not change any behavior
or functionality -- it only reorganizes the existing code and fixes up
the linkages. A few places outside of Hyper-V code are fixed up to use
the new #include file structure.
This restructuring is in response to Marc Zyngier's review comments
on supporting Hyper-V running on ARM64, and is a good idea in general.
It increases the amount of code shared between the x86 and ARM64
architectures, and reduces the size of the new code for supporting
Hyper-V on ARM64. A new version of the Hyper-V on ARM64 patches will
follow once this clocksource restructuring is accepted.
The code is diff'ed against the upstream tip tree:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
Changes in v5:
* Revised commit summaries [Thomas Gleixner]
* Removed call to clockevents_unbind_device() [Thomas Gleixner]
* Restructured hv_init_clocksource() [Thomas Gleixner]
* Various other small code cleanups [Thomas Gleixner]
Changes in v4:
* Revised commit messages
* Rebased to upstream tip tree
Changes in v3:
* Removed boolean argument to hv_init_clocksource(). Always call
sched_clock_register, which is needed on ARM64 but a no-op on x86.
* Removed separate cpuhp setup in hv_stimer_alloc() and instead
directly call hv_stimer_init() and hv_stimer_cleanup() from
corresponding VMbus functions. This more closely matches original
code and avoids clocksource stop/restart problems on ARM64 when
VMbus code denies CPU offlining request.
Changes in v2:
* Revised commit short descriptions so the distinction between
the first and second patches is clearer [GregKH]
* Renamed new clocksource driver files and functions to use
existing "timer" and "stimer" names instead of introducing
"syntimer". [Vitaly Kuznetsov]
* Introduced CONFIG_HYPER_TIMER to fix build problem when
CONFIG_HYPERV=m [Vitaly Kuznetsov]
* Added "Suggested-by: Marc Zyngier"
Michael Kelley (2):
clocksource/drivers: Make Hyper-V clocksource ISA agnostic
clocksource/drivers: Continue making Hyper-V clocksource ISA agnostic
MAINTAINERS | 2 +
arch/x86/entry/vdso/vma.c | 2 +-
arch/x86/hyperv/hv_init.c | 91 +--------
arch/x86/include/asm/hyperv-tlfs.h | 6 +
arch/x86/include/asm/mshyperv.h | 81 +-------
arch/x86/include/asm/vdso/gettimeofday.h | 2 +-
arch/x86/kernel/cpu/mshyperv.c | 4 +-
arch/x86/kvm/x86.c | 1 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/hyperv_timer.c | 339 +++++++++++++++++++++++++++++++
drivers/hv/Kconfig | 3 +
drivers/hv/hv.c | 156 +-------------
drivers/hv/hv_util.c | 1 +
drivers/hv/hyperv_vmbus.h | 3 -
drivers/hv/vmbus_drv.c | 42 ++--
include/clocksource/hyperv_timer.h | 105 ++++++++++
16 files changed, 503 insertions(+), 336 deletions(-)
create mode 100644 drivers/clocksource/hyperv_timer.c
create mode 100644 include/clocksource/hyperv_timer.h
--
1.8.3.1
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