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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651ccec04sm123053925ad.102.2025.11.09.15.16.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Nov 2025 15:16:24 -0800 (PST) Message-ID: <58d05fba-d678-4564-beba-45f667f9e975@redhat.com> Date: Mon, 10 Nov 2025 09:16:12 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 28/33] arm_mpam: Consider overflow in bandwidth counter state To: Ben Horgan , james.morse@arm.com Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, bobo.shaobowang@huawei.com, carl@os.amperecomputing.com, catalin.marinas@arm.com, dakr@kernel.org, dave.martin@arm.com, david@redhat.com, dfustini@baylibre.com, fenghuay@nvidia.com, gregkh@linuxfoundation.org, guohanjun@huawei.com, jeremy.linton@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peternewman@google.com, quic_jiles@quicinc.com, rafael@kernel.org, robh@kernel.org, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, sudeep.holla@arm.com, tan.shaopeng@fujitsu.com, will@kernel.org, xhao@linux.alibaba.com, Zeng Heng References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-29-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20251107123450.664001-29-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/7/25 10:34 PM, Ben Horgan wrote: > Use the overflow status bit to track overflow on each bandwidth counter > read and add the counter size to the correction when overflow is detected. > > This assumes that only a single overflow has occurred since the last read > of the counter. Overflow interrupts, on hardware that supports them could > be used to remove this limitation. > > Cc: Zeng Heng > Signed-off-by: Ben Horgan > --- > drivers/resctrl/mpam_devices.c | 24 ++++++++++++++++++++++-- > drivers/resctrl/mpam_internal.h | 3 ++- > 2 files changed, 24 insertions(+), 3 deletions(-) > Reviewed-by: Gavin Shan