From: Will Deacon <will.deacon@arm.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Cc: mark.rutland@arm.com, vkilari@codeaurora.org,
lorenzo.pieralisi@arm.com, neil.m.leeder@gmail.com,
jean-philippe.brucker@arm.com, pabba@codeaurora.org,
john.garry@huawei.com, linuxarm@huawei.com,
rruigrok@codeaurora.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, guohanjun@huawei.com,
andrew.murray@arm.com, robin.murphy@arm.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v7 4/4] perf/smmuv3: Enable HiSilicon Erratum 162001800 quirk
Date: Thu, 4 Apr 2019 16:47:11 +0100 [thread overview]
Message-ID: <20190404154711.GA27577@fuggles.cambridge.arm.com> (raw)
In-Reply-To: <20190326151753.19384-5-shameerali.kolothum.thodi@huawei.com>
On Tue, Mar 26, 2019 at 03:17:53PM +0000, Shameer Kolothum wrote:
> HiSilicon erratum 162001800 describes the limitation of
> SMMUv3 PMCG implementation on HiSilicon Hip08 platforms.
>
> On these platforms, the PMCG event counter registers
> (SMMU_PMCG_EVCNTRn) are read only and as a result it
> is not possible to set the initial counter period value
> on event monitor start.
>
> To work around this, the current value of the counter
> is read and used for delta calculations. OEM information
> from ACPI header is used to identify the affected hardware
> platforms.
>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> ---
> drivers/acpi/arm64/iort.c | 16 ++++++++++++++-
> drivers/perf/arm_smmuv3_pmu.c | 48 ++++++++++++++++++++++++++++++++++++-------
> include/linux/acpi_iort.h | 1 +
> 3 files changed, 57 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index e2c9b26..4dc68de 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1366,9 +1366,23 @@ static void __init arm_smmu_v3_pmcg_init_resources(struct resource *res,
> ACPI_EDGE_SENSITIVE, &res[2]);
> }
>
> +static struct acpi_platform_list pmcg_plat_info[] __initdata = {
> + /* HiSilicon Hip08 Platform */
> + {"HISI ", "HIP08 ", 0, ACPI_SIG_IORT, greater_than_or_equal, 0,
Passing integer constant 0 for the reason feels wrong to me. I'm going to
change it to "Erratum #162001800" and also add an entry to
silicon-errata.txt.
Please shout if that's not ok.
Will
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next prev parent reply other threads:[~2019-04-04 15:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-26 15:17 [PATCH v7 0/4] arm64 SMMUv3 PMU driver with IORT support Shameer Kolothum
2019-03-26 15:17 ` [PATCH v7 1/4] ACPI/IORT: Add support for PMCG Shameer Kolothum
2019-03-26 15:17 ` [PATCH v7 2/4] perf/smmuv3: Add arm64 smmuv3 pmu driver Shameer Kolothum
2019-03-26 16:57 ` Robin Murphy
2019-03-26 17:02 ` Shameerali Kolothum Thodi
2019-04-04 15:30 ` Will Deacon
2019-03-26 15:17 ` [PATCH v7 3/4] perf/smmuv3: Add MSI irq support Shameer Kolothum
2019-03-26 15:17 ` [PATCH v7 4/4] perf/smmuv3: Enable HiSilicon Erratum 162001800 quirk Shameer Kolothum
2019-04-04 12:32 ` Will Deacon
2019-04-04 14:49 ` Lorenzo Pieralisi
2019-04-04 15:47 ` Will Deacon [this message]
2019-04-04 16:31 ` Shameerali Kolothum Thodi
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