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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-87c31ee8aa2sm284836b3a.13.2026.09.21.22.42.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2026 22:42:35 -0700 (PDT) Message-ID: <0bd449a3-6432-46c9-8cf1-26c774e5c056@redhat.com> Date: Tue, 22 Sep 2026 15:42:30 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 03/12] arm_mpam: Set mpam_feat_msmon_mbwu_31counter when there are bandwidth counters To: Ben Horgan Cc: james.morse@arm.com, reinette.chatre@intel.com, fenghuay@nvidia.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dave.martin@arm.com, andre.przywara@arm.com References: <20260917145617.2202986-1-ben.horgan@arm.com> <20260917145617.2202986-4-ben.horgan@arm.com> From: Gavin Shan In-Reply-To: <20260917145617.2202986-4-ben.horgan@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: LG7j2kYRlaaj_l9Lpu0aXmqYlnaQwWHEhqkONVJBjJg_1790055757 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260921_224242_386634_E59F8FE2 X-CRM114-Status: GOOD ( 13.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/18/26 12:56 AM, Ben Horgan wrote: > When MPAMF_MSMON_IDR.MSMON_MBWU is 1, MSMON_MBWU is present and has a VALUE > field of 31 bits. If additionally, MPAMF_MBWUMON_IDR.HAS_LONG is 1, then > MSMON_MBWU_L is also present and has a VALUE field of 44 or 63 bits as > indicated by MPAMF_MBWUMON_IDR.LWD. Hence, if there are memory bandwidth > counters then there are always 31 bit counters irrespective of whether > there also long counters. > > Set the 31 bit bandwidth counter feature bit whenever there are bandwidth > counters. > > Fixes: fdc29a141d63 ("arm_mpam: Probe for long/lwd mbwu counters") > Signed-off-by: Ben Horgan > Tested-by: Gavin Shan > --- > drivers/resctrl/mpam_devices.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > Reviewed-by: Gavin Shan