From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: James Morse <james.morse@arm.com>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-acpi@vger.kernel.org>,
D Scott Phillips OS <scott@os.amperecomputing.com>,
<carl@os.amperecomputing.com>, <lcherian@marvell.com>,
<bobo.shaobowang@huawei.com>, <tan.shaopeng@fujitsu.com>,
<baolin.wang@linux.alibaba.com>,
Jamie Iles <quic_jiles@quicinc.com>,
Xin Hao <xhao@linux.alibaba.com>, <peternewman@google.com>,
<dfustini@baylibre.com>, <amitsinght@marvell.com>,
David Hildenbrand <david@redhat.com>,
Dave Martin <dave.martin@arm.com>, Koba Ko <kobak@nvidia.com>,
Shanker Donthineni <sdonthineni@nvidia.com>,
<fenghuay@nvidia.com>, <baisheng.gao@unisoc.com>,
Rob Herring <robh@kernel.org>,
Rohit Mathew <rohit.mathew@arm.com>,
"Rafael Wysocki" <rafael@kernel.org>, Len Brown <lenb@kernel.org>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
"Will Deacon" <will@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Danilo Krummrich <dakr@kernel.org>,
Ben Horgan <ben.horgan@arm.com>
Subject: Re: [PATCH v2 26/29] arm_mpam: Use long MBWU counters if supported
Date: Fri, 12 Sep 2025 14:29:29 +0100 [thread overview]
Message-ID: <20250912142929.00003cff@huawei.com> (raw)
In-Reply-To: <20250910204309.20751-27-james.morse@arm.com>
On Wed, 10 Sep 2025 20:43:06 +0000
James Morse <james.morse@arm.com> wrote:
> From: Rohit Mathew <rohit.mathew@arm.com>
>
> If the 44 bit (long) or 63 bit (LWD) counters are detected on probing
> the RIS, use long/LWD counter instead of the regular 31 bit mbwu
> counter.
>
> Only 32bit accesses to the MSC are required to be supported by the
> spec, but these registers are 64bits. The lower half may overflow
> into the higher half between two 32bit reads. To avoid this, use
> a helper that reads the top half multiple times to check for overflow.
>
> Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
> [morse: merged multiple patches from Rohit]
> Signed-off-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
next prev parent reply other threads:[~2025-09-12 13:29 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-10 20:42 [PATCH v2 00/29] arm_mpam: Add basic mpam driver James Morse
2025-09-10 20:42 ` [PATCH v2 01/29] ACPI / PPTT: Add a helper to fill a cpumask from a processor container James Morse
2025-09-11 10:43 ` Jonathan Cameron
2025-09-11 10:48 ` Jonathan Cameron
2025-09-19 16:10 ` James Morse
2025-09-25 9:32 ` Stanimir Varbanov
2025-10-10 16:54 ` James Morse
2025-10-02 3:35 ` Fenghua Yu
2025-10-10 16:54 ` James Morse
2025-10-03 0:15 ` Gavin Shan
2025-10-10 16:55 ` James Morse
2025-09-10 20:42 ` [PATCH v2 02/29] ACPI / PPTT: Stop acpi_count_levels() expecting callers to clear levels James Morse
2025-09-11 10:46 ` Jonathan Cameron
2025-09-19 16:10 ` James Morse
2025-09-11 14:08 ` Ben Horgan
2025-09-19 16:10 ` James Morse
2025-10-02 3:55 ` Fenghua Yu
2025-10-10 16:55 ` James Morse
2025-10-03 0:17 ` Gavin Shan
2025-09-10 20:42 ` [PATCH v2 03/29] ACPI / PPTT: Find cache level by cache-id James Morse
2025-09-11 10:59 ` Jonathan Cameron
2025-09-19 16:10 ` James Morse
2025-09-11 15:27 ` Lorenzo Pieralisi
2025-09-19 16:10 ` James Morse
2025-10-02 4:30 ` Fenghua Yu
2025-10-10 16:55 ` James Morse
2025-10-03 0:23 ` Gavin Shan
2025-09-10 20:42 ` [PATCH v2 04/29] ACPI / PPTT: Add a helper to fill a cpumask from a cache_id James Morse
2025-09-11 11:06 ` Jonathan Cameron
2025-09-19 16:10 ` James Morse
2025-10-02 5:03 ` Fenghua Yu
2025-10-10 16:55 ` James Morse
2025-09-10 20:42 ` [PATCH v2 05/29] arm64: kconfig: Add Kconfig entry for MPAM James Morse
2025-09-12 10:14 ` Ben Horgan
2025-10-02 5:06 ` Fenghua Yu
2025-10-10 16:55 ` James Morse
2025-10-03 0:32 ` Gavin Shan
2025-10-10 16:55 ` James Morse
2025-09-10 20:42 ` [PATCH v2 06/29] ACPI / MPAM: Parse the MPAM table James Morse
2025-09-11 13:17 ` Jonathan Cameron
2025-09-19 16:11 ` James Morse
2025-09-26 14:48 ` Jonathan Cameron
2025-10-17 18:50 ` James Morse
2025-09-11 14:56 ` Lorenzo Pieralisi
2025-09-19 16:11 ` James Morse
2025-09-16 13:17 ` [PATCH] arm_mpam: Try reading again if MPAM instance returns not ready Zeng Heng
2025-09-19 16:11 ` James Morse
2025-09-20 10:14 ` Zeng Heng
2025-10-02 3:21 ` [PATCH v2 06/29] ACPI / MPAM: Parse the MPAM table Fenghua Yu
2025-10-17 18:50 ` James Morse
2025-10-03 0:58 ` Gavin Shan
2025-10-17 18:51 ` James Morse
2025-09-10 20:42 ` [PATCH v2 07/29] arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate James Morse
2025-09-11 13:35 ` Jonathan Cameron
2025-09-23 16:41 ` James Morse
2025-09-26 14:55 ` Jonathan Cameron
2025-10-17 18:51 ` James Morse
2025-09-17 11:03 ` Ben Horgan
2025-09-29 17:44 ` James Morse
2025-10-03 3:53 ` Gavin Shan
2025-10-17 18:51 ` James Morse
2025-09-10 20:42 ` [PATCH v2 08/29] arm_mpam: Add the class and component structures for firmware described ris James Morse
2025-09-11 14:22 ` Jonathan Cameron
2025-09-26 17:52 ` James Morse
2025-09-11 16:30 ` Markus Elfring
2025-09-26 17:52 ` James Morse
2025-09-26 18:15 ` Markus Elfring
2025-10-17 18:51 ` James Morse
2025-10-03 16:54 ` Fenghua Yu
2025-10-17 18:51 ` James Morse
2025-10-06 23:13 ` Gavin Shan
2025-10-17 18:51 ` James Morse
2025-09-10 20:42 ` [PATCH v2 09/29] arm_mpam: Add MPAM MSC register layout definitions James Morse
2025-09-11 15:00 ` Jonathan Cameron
2025-10-17 18:53 ` James Morse
2025-09-12 7:33 ` Markus Elfring
2025-10-06 23:25 ` Gavin Shan
2025-09-10 20:42 ` [PATCH v2 10/29] arm_mpam: Add cpuhp callbacks to probe MSC hardware James Morse
2025-09-11 15:07 ` Jonathan Cameron
2025-09-29 17:44 ` James Morse
2025-09-12 10:42 ` Ben Horgan
2025-09-29 17:44 ` James Morse
2025-10-03 17:56 ` Fenghua Yu
2025-10-06 23:42 ` Gavin Shan
2025-09-10 20:42 ` [PATCH v2 11/29] arm_mpam: Probe hardware to find the supported partid/pmg values James Morse
2025-09-11 15:18 ` Jonathan Cameron
2025-09-29 17:44 ` James Morse
2025-09-12 11:11 ` Ben Horgan
2025-09-29 17:44 ` James Morse
2025-10-03 18:58 ` Fenghua Yu
2025-09-10 20:42 ` [PATCH v2 12/29] arm_mpam: Add helpers for managing the locking around the mon_sel registers James Morse
2025-09-11 15:24 ` Jonathan Cameron
2025-09-29 17:44 ` James Morse
2025-09-11 15:31 ` Ben Horgan
2025-09-29 17:44 ` James Morse
2025-10-05 0:09 ` Fenghua Yu
2025-09-10 20:42 ` [PATCH v2 13/29] arm_mpam: Probe the hardware features resctrl supports James Morse
2025-09-11 15:29 ` Jonathan Cameron
2025-09-29 17:45 ` James Morse
2025-09-11 15:37 ` Ben Horgan
2025-09-29 17:45 ` James Morse
2025-09-30 13:32 ` Ben Horgan
2025-10-05 0:53 ` Fenghua Yu
2025-09-10 20:42 ` [PATCH v2 14/29] arm_mpam: Merge supported features during mpam_enable() into mpam_class James Morse
2025-09-12 11:49 ` Jonathan Cameron
2025-09-29 17:45 ` James Morse
2025-10-05 1:28 ` Fenghua Yu
2025-09-10 20:42 ` [PATCH v2 15/29] arm_mpam: Reset MSC controls from cpu hp callbacks James Morse
2025-09-12 11:25 ` Ben Horgan
2025-09-12 14:52 ` Ben Horgan
2025-09-30 17:06 ` James Morse
2025-09-30 17:06 ` James Morse
2025-09-12 11:55 ` Jonathan Cameron
2025-09-30 17:06 ` James Morse
2025-09-30 2:51 ` Shaopeng Tan (Fujitsu)
2025-10-01 9:51 ` James Morse
[not found] ` <1f084a23-7211-4291-99b6-7f5192fb9096@nvidia.com>
2025-10-17 18:50 ` James Morse
2025-09-10 20:42 ` [PATCH v2 16/29] arm_mpam: Add a helper to touch an MSC from any CPU James Morse
2025-09-12 11:57 ` Jonathan Cameron
2025-10-01 9:50 ` James Morse
2025-10-05 21:08 ` Fenghua Yu
2025-09-10 20:42 ` [PATCH v2 17/29] arm_mpam: Extend reset logic to allow devices to be reset any time James Morse
2025-09-12 11:42 ` Ben Horgan
2025-10-02 18:02 ` James Morse
2025-09-12 12:02 ` Jonathan Cameron
2025-09-30 17:06 ` James Morse
2025-09-25 7:16 ` Fenghua Yu
2025-10-02 18:02 ` James Morse
2025-09-10 20:42 ` [PATCH v2 18/29] arm_mpam: Register and enable IRQs James Morse
2025-09-12 12:12 ` Jonathan Cameron
2025-10-02 18:02 ` James Morse
2025-09-12 14:40 ` Ben Horgan
2025-10-02 18:03 ` James Morse
2025-09-12 15:22 ` Dave Martin
2025-10-03 18:02 ` James Morse
2025-09-25 6:33 ` Fenghua Yu
2025-10-03 18:03 ` James Morse
2025-09-10 20:42 ` [PATCH v2 19/29] arm_mpam: Use a static key to indicate when mpam is enabled James Morse
2025-09-12 12:13 ` Jonathan Cameron
2025-10-03 18:03 ` James Morse
2025-09-12 14:42 ` Ben Horgan
2025-10-03 18:03 ` James Morse
2025-09-26 2:31 ` Fenghua Yu
2025-10-03 18:04 ` James Morse
2025-09-10 20:43 ` [PATCH v2 20/29] arm_mpam: Allow configuration to be applied and restored during cpu online James Morse
2025-09-12 12:22 ` Jonathan Cameron
2025-10-07 11:11 ` James Morse
2025-09-12 15:00 ` Ben Horgan
2025-09-25 6:53 ` Fenghua Yu
2025-10-03 18:04 ` James Morse
2025-09-10 20:43 ` [PATCH v2 21/29] arm_mpam: Probe and reset the rest of the features James Morse
2025-09-12 13:07 ` Jonathan Cameron
2025-10-03 18:05 ` James Morse
2025-09-10 20:43 ` [PATCH v2 22/29] arm_mpam: Add helpers to allocate monitors James Morse
2025-09-12 13:11 ` Jonathan Cameron
2025-10-06 14:57 ` James Morse
2025-10-06 15:56 ` James Morse
2025-09-10 20:43 ` [PATCH v2 23/29] arm_mpam: Add mpam_msmon_read() to read monitor value James Morse
2025-09-11 15:46 ` Ben Horgan
2025-09-12 15:08 ` Ben Horgan
2025-10-06 16:00 ` James Morse
2025-10-06 15:59 ` James Morse
2025-09-12 13:21 ` Jonathan Cameron
2025-10-09 17:48 ` James Morse
2025-09-25 2:30 ` Fenghua Yu
2025-10-09 17:48 ` James Morse
2025-09-10 20:43 ` [PATCH v2 24/29] arm_mpam: Track bandwidth counter state for overflow and power management James Morse
2025-09-12 13:24 ` Jonathan Cameron
2025-10-09 17:48 ` James Morse
2025-09-12 15:55 ` Ben Horgan
2025-10-13 16:29 ` James Morse
2025-09-10 20:43 ` [PATCH v2 25/29] arm_mpam: Probe for long/lwd mbwu counters James Morse
2025-09-12 13:27 ` Jonathan Cameron
2025-10-09 17:48 ` James Morse
2025-09-10 20:43 ` [PATCH v2 26/29] arm_mpam: Use long MBWU counters if supported James Morse
2025-09-12 13:29 ` Jonathan Cameron [this message]
2025-10-10 16:53 ` James Morse
2025-09-26 4:51 ` Fenghua Yu
2025-09-10 20:43 ` [PATCH v2 27/29] arm_mpam: Add helper to reset saved mbwu state James Morse
2025-09-12 13:33 ` Jonathan Cameron
2025-10-10 16:53 ` James Morse
2025-09-18 2:35 ` Shaopeng Tan (Fujitsu)
2025-10-10 16:53 ` James Morse
2025-09-26 4:11 ` Fenghua Yu
2025-10-10 16:53 ` James Morse
2025-09-10 20:43 ` [PATCH v2 28/29] arm_mpam: Add kunit test for bitmap reset James Morse
2025-09-12 13:37 ` Jonathan Cameron
2025-10-10 16:53 ` James Morse
2025-09-12 16:06 ` Ben Horgan
2025-10-10 16:53 ` James Morse
2025-09-26 2:35 ` Fenghua Yu
2025-10-10 16:53 ` James Morse
2025-09-10 20:43 ` [PATCH v2 29/29] arm_mpam: Add kunit tests for props_mismatch() James Morse
2025-09-12 13:41 ` Jonathan Cameron
2025-10-10 16:54 ` James Morse
2025-09-12 16:01 ` Ben Horgan
2025-10-10 16:54 ` James Morse
2025-09-26 2:36 ` Fenghua Yu
2025-10-10 16:54 ` James Morse
2025-09-25 7:18 ` [PATCH v2 00/29] arm_mpam: Add basic mpam driver Fenghua Yu
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