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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c74487b5b8csm9108581a12.31.2026.03.23.20.41.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2026 20:41:26 -0700 (PDT) Message-ID: <711b91dc-8861-4948-97b8-47a5ec21affa@redhat.com> Date: Tue, 24 Mar 2026 13:41:09 +1000 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 29/40] arm_mpam: resctrl: Allow resctrl to allocate monitors To: Ben Horgan 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, 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, catalin.marinas@arm.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 References: <20260313144617.3420416-1-ben.horgan@arm.com> <20260313144617.3420416-30-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260313144617.3420416-30-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/14/26 12:46 AM, Ben Horgan wrote: > From: James Morse > > When resctrl wants to read a domain's 'QOS_L3_OCCUP', it needs to allocate > a monitor on the corresponding resource. Monitors are allocated by class > instead of component. > > Add helpers to allocate a CSU monitor. These helper return an out of range > value for MBM counters. > > Allocating a montitor context is expected to block until hardware resources > become available. This only makes sense for QOS_L3_OCCUP as unallocated MBM > counters are losing data. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Tested-by: Punit Agrawal > Reviewed-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > Changes since rfc: > USE_RMID_IDX -> USE_PRE_ALLOCATED in comment > Remove unnecessary arch_mon_ctx = NULL > > Changes since v2: > Add include of resctrl_types.h as dropped from earlier patch > > Changes since v3: > Don't mention ABMC in commit message > > Changes since v5: > Remove MBM free running sentence from commit message > kmalloc -> kmalloc_obj > --- > drivers/resctrl/mpam_internal.h | 14 ++++++- > drivers/resctrl/mpam_resctrl.c | 67 +++++++++++++++++++++++++++++++++ > include/linux/arm_mpam.h | 5 +++ > 3 files changed, 85 insertions(+), 1 deletion(-) > Reviewed-by: Gavin Shan