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Thu, 10 Sep 2026 11:52:10 -0700 (PDT) X-Received: by 2002:a17:90b:54c6:b0:38e:9784:dd47 with SMTP id 98e67ed59e1d1-39d779167ddmr7340943a91.1.1789066330283; Thu, 10 Sep 2026 11:52:10 -0700 (PDT) Received: from localhost ([50.35.44.179]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-14365b97994sm893525c88.12.2026.09.10.11.52.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 11:52:08 -0700 (PDT) Date: Thu, 10 Sep 2026 11:52:04 -0700 From: Jonathan Cameron To: Srirangan Madhavan Cc: mark.rutland@arm.com, lpieralisi@kernel.org, sudeep.holla@kernel.org, conor@kernel.org, jic23@kernel.org, catalin.marinas@arm.com, will@kernel.org, treding@nvidia.com, jonathanh@nvidia.com, bence.csokas@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org Subject: Re: [PATCH v3 2/2] cache: add SMCCC-backed cache invalidate provider Message-ID: <20260910115204.00005a79@oss.qualcomm.com> In-Reply-To: <20260910082142.1522865-3-smadhavan@nvidia.com> References: <20260910082142.1522865-1-smadhavan@nvidia.com> <20260910082142.1522865-3-smadhavan@nvidia.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTEwMDIzMiBTYWx0ZWRfXwPuoh+Eby0fv V8B0HigcxXtm8iiHlcxR8EeUD9+/2KTkdxNjD5UvUDrTu6tPsgzYuumPvyRgYd0VUx1QFnSMVgJ BAZautRyEMUIxPwqMYATv66mqnn/0zqHJSIeb+OCOCcCtfPr2ZMUpQTOx+sfk46lMfPBCUqn2GD b/3esbk2PTBd51Xye0MtdP+7CG8j2t8vE3ewUu8BVUW7i0jVM2rJ1D6HplKnujMuRMKZqMATbRq U0E01R4EbmaK180AcGVb0NFueYukyThwJGugWKtFde0WdgDQo6/Hfk0pmGx2mHc7LSt3WsB0BV0 Y6ak+SxD/5eXF61XL4D7OLCfjqCT8EfQNknANgiZxDuN/3N9322nCSiPPWSaswES0rDIAJJ0+a5 AhApS1HeWr9mejA7FDkJQ2B+K08UCP5w2PX8RKTwkaMRsuNmxp7usxQxF4fdtLy/zUq/TDcjVBC r5geCBbE5hxNMeN+T7g== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTEwMDIzMiBTYWx0ZWRfX09QfFNVkmhpz Wg5RWj2N0dxACbaUIwyZjY2UfXcevtVuVF88IwfrM903MTFMv9HxkGKMOuGjcHYLr809B/Jn78j GbPsg+eiExabsqiv3G/AS6toTPONlwA= X-Proofpoint-GUID: 5MFAOLZ4VXkCY2dZR1PhRvM2ZlKyzUJ- X-Authority-Analysis: v=2.4 cv=TupzFzXh c=1 sm=1 tr=0 ts=6aa2fc5b cx=c_pps a=rz3CxIlbcmazkYymdCej/Q==:117 a=aNnz9XPx1a4JIXSYt2cE/A==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=Ikd4Dj_1AAAA:8 a=VwQbUJbxAAAA:8 a=6Y3uqnu38QBErNT00lMA:9 a=CjuIK1q_8ugA:10 a=bFCP_H2QrGi7Okbo017w:22 X-Proofpoint-ORIG-GUID: 5MFAOLZ4VXkCY2dZR1PhRvM2ZlKyzUJ- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-10_06,2026-09-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1011 bulkscore=0 suspectscore=0 phishscore=0 priorityscore=1501 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609100232 On Thu, 10 Sep 2026 08:21:42 +0000 Srirangan Madhavan wrote: > Add a cache maintenance provider for the Arm SMCCC cache clean+invalidate > interface. > > The provider discovers SMCCC support and attributes at init time, > serializes firmware calls, handles transient BUSY and RATE_LIMITED > responses with bounded retries, and registers with the generic cache > coherency framework used by memregion callers. > > Signed-off-by: Srirangan Madhavan > Reviewed-by: Jonathan Cameron One tiny thing inline. Thanks, Jonathan > diff --git a/drivers/cache/arm_smccc_cache.c b/drivers/cache/arm_smccc_cache.c > new file mode 100644 > index 000000000000..1cfa8f8809d0 > --- /dev/null > +++ b/drivers/cache/arm_smccc_cache.c > @@ -0,0 +1,149 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2026 NVIDIA Corporation > + * > + * Arm SMCCC cache maintenance provider using cache clean+invalidate calls. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include Small thing, but can we avoid including the catch all that is kernel.h. Generally aim for more specific headers for what is actually used. > +#include > +#include > +