From: Marc Zyngier <marc.zyngier@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>, Scott Wood <oss@buserror.net>,
Hanjun Guo <hanjun.guo@linaro.org>,
Ding Tianhong <dingtianhong@huawei.com>,
dann frazier <dann.frazier@canonical.com>
Subject: Re: [PATCH v2 06/18] arm64: arch_timer: Add infrastructure for multiple erratum detection methods
Date: Wed, 22 Mar 2017 15:53:47 +0000 [thread overview]
Message-ID: <ede3d1d8-ba44-3039-35db-3f938bb411bb@arm.com> (raw)
In-Reply-To: <20170322154114.GE30499@mai>
On 22/03/17 15:41, Daniel Lezcano wrote:
> On Mon, Mar 20, 2017 at 05:48:17PM +0000, Marc Zyngier wrote:
>> We're currently stuck with DT when it comes to handling errata, which
>> is pretty restrictive. In order to make things more flexible, let's
>> introduce an infrastructure that could support alternative discovery
>> methods. No change in functionality.
>>
>> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
>> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
>> ---
>> arch/arm64/include/asm/arch_timer.h | 7 +++-
>> drivers/clocksource/arm_arch_timer.c | 80 +++++++++++++++++++++++++++++++-----
>> 2 files changed, 75 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
>> index b4b34004a21e..5cd964e90d11 100644
>> --- a/arch/arm64/include/asm/arch_timer.h
>> +++ b/arch/arm64/include/asm/arch_timer.h
>> @@ -37,9 +37,14 @@ extern struct static_key_false arch_timer_read_ool_enabled;
>> #define needs_unstable_timer_counter_workaround() false
>> #endif
>>
>> +enum arch_timer_erratum_match_type {
>> + ate_match_dt,
>> +};
>>
>> struct arch_timer_erratum_workaround {
>> - const char *id; /* Indicate the Erratum ID */
>> + enum arch_timer_erratum_match_type match_type;
>
> Putting the match_fn instead will be much more simpler and the code won't
> have to deal with ate_match_type, no ?
I'm not sure about the "much simpler" aspect. Each function is not
necessarily standalone (see patches 8 and 13 for example, dealing with
CPU-local defects). We
>
> [ ... ]
>
>> +static void arch_timer_check_ool_workaround(enum arch_timer_erratum_match_type type,
>> + void *arg)
>> +{
>> + const struct arch_timer_erratum_workaround *wa;
>> + ate_match_fn_t match_fn = NULL;
>> +
>> + if (static_branch_unlikely(&arch_timer_read_ool_enabled))
>> + return;
>> +
>
> Why is this check necessary ?
We don't allow cumulative workarounds at this stage. This restriction
gets lifted (to some extent) later in the series.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2017-03-22 15:54 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-20 17:48 [PATCH v2 00/18] clocksource/arch_timer: Errata workaround infrastructure rework Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 01/18] arm64: Allow checking of a CPU-local erratum Marc Zyngier
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 ` [PATCH v2 03/18] arm64: Define Cortex-A73 MIDR 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
2017-03-22 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
2017-03-22 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
2017-03-22 15:41 ` Daniel Lezcano
2017-03-22 15:53 ` Marc Zyngier [this message]
2017-03-22 15:59 ` Marc Zyngier
2017-03-22 16:52 ` Daniel Lezcano
2017-03-23 17:30 ` Daniel Lezcano
2017-03-24 13:51 ` Marc Zyngier
2017-03-27 7:56 ` Daniel Lezcano
2017-03-28 13:07 ` Marc Zyngier
2017-03-28 13:34 ` Daniel Lezcano
2017-03-28 14:07 ` Marc Zyngier
2017-03-28 14:36 ` Daniel Lezcano
2017-03-28 14:48 ` Marc Zyngier
2017-03-28 14:55 ` Daniel Lezcano
2017-03-28 15:38 ` Marc Zyngier
2017-03-29 14:27 ` Daniel Lezcano
2017-03-29 14:56 ` Marc Zyngier
2017-03-29 15:12 ` Daniel Lezcano
2017-03-24 17:48 ` dann frazier
2017-03-24 18:00 ` Marc Zyngier
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 ` [PATCH v2 08/18] arm64: arch_timer: Add erratum handler for CPU-specific capability Marc Zyngier
2017-03-20 17:48 ` [PATCH v2 09/18] arm64: arch_timer: Move arch_timer_reg_read/write around Marc Zyngier
2017-03-22 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 ` [PATCH v2 11/18] arm64: arch_timer: Rework the set_next_event workarounds 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 ` [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 ` [PATCH v2 14/18] arm64: arch_timer: Move clocksource_counter and co around 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 ` [PATCH v2 16/18] arm64: arch_timer: Workaround for Cortex-A73 erratum 858921 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 ` [PATCH v2 18/18] arm64: arch_timer: Add HISILICON_ERRATUM_161010101 ACPI matching data Marc Zyngier
2017-03-22 13:56 ` [PATCH v2 00/18] clocksource/arch_timer: Errata workaround infrastructure rework Ding Tianhong
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