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[212.182.62.129]) by smtp.gmail.com with ESMTPSA id d27-20020a19385b000000b0050a026d3a26sm1705739lfj.227.2023.11.15.08.43.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Nov 2023 08:43:43 -0800 (PST) Message-ID: Date: Wed, 15 Nov 2023 17:43:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/3] iommu/arm-smmu: re-enable context caching in smmu reset operation Content-Language: en-US To: Bibek Kumar Patro , will@kernel.org, robin.murphy@arm.com, joro@8bytes.org, dmitry.baryshkov@linaro.org, a39.skl@gmail.com, quic_pkondeti@quicinc.com, quic_molvera@quicinc.com Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, qipl.kernel.upstream@quicinc.com References: <20231114135654.30475-1-quic_bibekkum@quicinc.com> <20231114135654.30475-4-quic_bibekkum@quicinc.com> From: Konrad Dybcio In-Reply-To: <20231114135654.30475-4-quic_bibekkum@quicinc.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231115_084346_294907_5BFB59C5 X-CRM114-Status: UNSURE ( 9.74 ) X-CRM114-Notice: Please train this message. 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: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11/14/23 14:56, Bibek Kumar Patro wrote: > Context caching is re-enabled in the prefetch buffer for Qualcomm SoCs > through SoC specific reset ops, which is disabled in the default MMU-500 > reset ops, but is expected for context banks using ACTLR register to > retain the prefetch value during reset and runtime suspend. > > Signed-off-by: Bibek Kumar Patro > --- And I assume that goes for all SMMU500 implementations? Looking at the 8550 ACTRL array from patch 2, CPRE is not enabled at all times.. Is that because of performance, or some other technical reason? Will this regress platforms without ACTRL tables? Konrad _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel