From: Catalin Marinas <catalin.marinas@arm.com>
To: Ben Horgan <ben.horgan@arm.com>
Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com,
baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com,
dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com,
fenghuay@nvidia.com, gshan@redhat.com, james.morse@arm.com,
jonathan.cameron@huawei.com, kobak@nvidia.com,
lcherian@marvell.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, peternewman@google.com,
punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com,
reinette.chatre@intel.com, rohit.mathew@arm.com,
scott@os.amperecomputing.com, sdonthineni@nvidia.com,
tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com,
will@kernel.org, corbet@lwn.net, maz@kernel.org,
oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com,
kvmarm@lists.linux.dev, zengheng4@huawei.com,
linux-doc@vger.kernel.org,
Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Subject: Re: [PATCH v4 10/41] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values
Date: Thu, 5 Feb 2026 16:56:26 +0000 [thread overview]
Message-ID: <aYTLumWRtV9wnO-D@arm.com> (raw)
In-Reply-To: <20260203214342.584712-11-ben.horgan@arm.com>
On Tue, Feb 03, 2026 at 09:43:11PM +0000, Ben Horgan wrote:
> From: James Morse <james.morse@arm.com>
>
> Care must be taken when modifying the PARTID and PMG of a task in any
> per-task structure as writing these values may race with the task being
> scheduled in, and reading the modified values.
>
> Add helpers to set the task properties, and the CPU default value. These
> use WRITE_ONCE() that pairs with the READ_ONCE() in mpam_get_regval() to
> avoid causing torn values.
>
> Tested-by: Gavin Shan <gshan@redhat.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman@google.com>
> CC: Dave Martin <Dave.Martin@arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
> Signed-off-by: James Morse <james.morse@arm.com>
> Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2026-02-05 16:56 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-03 21:43 [PATCH v4 00/41] arm_mpam: Add KVM/arm64 and resctrl glue code Ben Horgan
2026-02-03 21:43 ` [PATCH v4 01/41] arm64/sysreg: Add MPAMSM_EL1 register Ben Horgan
2026-02-03 21:43 ` [PATCH v4 02/41] KVM: arm64: Preserve host MPAM configuration when changing traps Ben Horgan
2026-02-03 21:43 ` [PATCH v4 03/41] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF Ben Horgan
2026-02-03 21:43 ` [PATCH v4 04/41] arm64: mpam: Context switch the MPAM registers Ben Horgan
2026-02-05 16:16 ` Catalin Marinas
2026-02-03 21:43 ` [PATCH v4 05/41] arm64: mpam: Re-initialise MPAM regs when CPU comes online Ben Horgan
2026-02-05 16:20 ` Catalin Marinas
2026-02-03 21:43 ` [PATCH v4 06/41] arm64: mpam: Drop the CONFIG_EXPERT restriction Ben Horgan
2026-02-05 14:08 ` Jonathan Cameron
2026-02-05 16:21 ` Catalin Marinas
2026-02-03 21:43 ` [PATCH v4 07/41] arm64: mpam: Advertise the CPUs MPAM limits to the driver Ben Horgan
2026-02-03 21:43 ` [PATCH v4 08/41] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs Ben Horgan
2026-02-05 16:54 ` Catalin Marinas
2026-02-03 21:43 ` [PATCH v4 09/41] arm64: mpam: Initialise and context switch the MPAMSM_EL1 register Ben Horgan
2026-02-05 16:55 ` Catalin Marinas
2026-02-03 21:43 ` [PATCH v4 10/41] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values Ben Horgan
2026-02-05 16:56 ` Catalin Marinas [this message]
2026-02-03 21:43 ` [PATCH v4 11/41] KVM: arm64: Force guest EL1 to use user-space's partid configuration Ben Horgan
2026-02-03 21:43 ` [PATCH v4 12/41] KVM: arm64: Use kernel-space partid configuration for hypercalls Ben Horgan
2026-02-03 21:43 ` [PATCH v4 13/41] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation Ben Horgan
2026-02-10 22:57 ` Reinette Chatre
2026-02-11 15:36 ` Ben Horgan
2026-02-03 21:43 ` [PATCH v4 14/41] arm_mpam: resctrl: Sort the order of the domain lists Ben Horgan
2026-02-03 21:43 ` [PATCH v4 15/41] arm_mpam: resctrl: Pick the caches we will use as resctrl resources Ben Horgan
2026-02-10 23:39 ` Reinette Chatre
2026-02-11 11:05 ` Ben Horgan
2026-02-12 16:22 ` Reinette Chatre
2026-02-03 21:43 ` [PATCH v4 16/41] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() Ben Horgan
2026-02-13 3:32 ` Zeng Heng
2026-02-03 21:43 ` [PATCH v4 17/41] arm_mpam: resctrl: Add resctrl_arch_get_config() Ben Horgan
2026-02-03 21:43 ` [PATCH v4 18/41] arm_mpam: resctrl: Implement helpers to update configuration Ben Horgan
2026-02-14 10:39 ` Zeng Heng
2026-02-16 14:23 ` Ben Horgan
2026-02-25 6:39 ` Zeng Heng
2026-02-03 21:43 ` [PATCH v4 19/41] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks Ben Horgan
2026-02-03 21:43 ` [PATCH v4 20/41] arm_mpam: resctrl: Add CDP emulation Ben Horgan
2026-02-09 1:16 ` Fenghua Yu
2026-02-09 15:36 ` Ben Horgan
2026-02-11 10:50 ` Ben Horgan
2026-02-03 21:43 ` [PATCH v4 21/41] arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats Ben Horgan
2026-02-03 21:43 ` [PATCH v4 22/41] arm_mpam: resctrl: Add kunit test for control format conversions Ben Horgan
2026-02-03 21:43 ` [PATCH v4 23/41] arm_mpam: resctrl: Add rmid index helpers Ben Horgan
2026-02-03 21:43 ` [PATCH v4 24/41] arm_mpam: resctrl: Add kunit test for rmid idx conversions Ben Horgan
2026-02-03 21:43 ` [PATCH v4 25/41] arm_mpam: resctrl: Wait for cacheinfo to be ready Ben Horgan
2026-02-03 21:43 ` [PATCH v4 26/41] arm_mpam: resctrl: Add support for 'MB' resource Ben Horgan
2026-02-05 16:50 ` Jonathan Cameron
2026-02-13 7:38 ` Zeng Heng
2026-02-16 13:54 ` Ben Horgan
2026-02-18 16:22 ` Ben Horgan
2026-02-18 17:17 ` Reinette Chatre
2026-02-25 8:08 ` Zeng Heng
2026-02-18 16:40 ` Ben Horgan
2026-02-10 6:20 ` Shaopeng Tan (Fujitsu)
2026-02-18 16:42 ` Ben Horgan
2026-02-03 21:43 ` [PATCH v4 27/41] arm_mpam: resctrl: Add support for csu counters Ben Horgan
2026-02-05 16:55 ` Jonathan Cameron
2026-02-03 21:43 ` [PATCH v4 28/41] arm_mpam: resctrl: Pick classes for use as mbm counters Ben Horgan
2026-02-05 16:58 ` Jonathan Cameron
2026-02-03 21:43 ` [PATCH v4 29/41] arm_mpam: resctrl: Pre-allocate free running monitors Ben Horgan
2026-02-03 21:43 ` [PATCH v4 30/41] arm_mpam: resctrl: Allow resctrl to allocate monitors Ben Horgan
2026-02-03 21:43 ` [PATCH v4 31/41] arm_mpam: resctrl: Add resctrl_arch_rmid_read() and resctrl_arch_reset_rmid() Ben Horgan
2026-02-03 21:43 ` [PATCH v4 32/41] arm_mpam: resctrl: Update the rmid reallocation limit Ben Horgan
2026-02-03 21:43 ` [PATCH v4 33/41] arm_mpam: resctrl: Add empty definitions for assorted resctrl functions Ben Horgan
2026-02-03 21:43 ` [PATCH v4 34/41] arm64: mpam: Select ARCH_HAS_CPU_RESCTRL Ben Horgan
2026-02-03 21:43 ` [PATCH v4 35/41] arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl Ben Horgan
2026-02-03 21:43 ` [PATCH v4 36/41] arm_mpam: Add quirk framework Ben Horgan
2026-02-03 21:43 ` [PATCH v4 37/41] arm_mpam: Add workaround for T241-MPAM-1 Ben Horgan
2026-02-03 21:43 ` [PATCH v4 38/41] arm_mpam: Add workaround for T241-MPAM-4 Ben Horgan
2026-02-13 7:02 ` Shaopeng Tan (Fujitsu)
2026-02-14 1:29 ` Zeng Heng
2026-02-20 2:30 ` Shaopeng Tan (Fujitsu)
2026-02-03 21:43 ` [PATCH v4 39/41] arm_mpam: Add workaround for T241-MPAM-6 Ben Horgan
2026-02-03 21:43 ` [PATCH v4 40/41] arm_mpam: Quirk CMN-650's CSU NRDY behaviour Ben Horgan
2026-02-03 21:43 ` [PATCH v4 41/41] arm64: mpam: Add initial MPAM documentation Ben Horgan
2026-02-05 16:57 ` Catalin Marinas
2026-02-05 17:05 ` Jonathan Cameron
2026-02-18 17:02 ` Ben Horgan
2026-02-09 8:25 ` [PATCH v4 00/41] arm_mpam: Add KVM/arm64 and resctrl glue code Shaopeng Tan (Fujitsu)
2026-02-09 10:04 ` Ben Horgan
2026-02-12 14:51 ` Ben Horgan
2026-02-13 7:18 ` Shaopeng Tan (Fujitsu)
2026-02-14 9:40 ` Zeng Heng
2026-02-16 12:22 ` Ben Horgan
2026-02-24 11:03 ` Zeng Heng
2026-02-24 14:19 ` Ben Horgan
2026-02-24 15:27 ` Ben Horgan
2026-02-24 17:53 ` Ben Horgan
2026-02-26 7:17 ` Zeng Heng
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