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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2df91443823sm4588265ad.57.2026.09.24.22.43.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Sep 2026 22:43:33 -0700 (PDT) Message-ID: <295014e8-24d7-494a-8f3e-0e17794d024f@redhat.com> Date: Fri, 25 Sep 2026 15:43:25 +1000 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v19 2/7] firmware: arm_rmm: Check for RMI support at init To: Suzuki K Poulose , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com References: <20260924135201.850038-1-suzuki.poulose@arm.com> <20260924135201.850038-3-suzuki.poulose@arm.com> From: Gavin Shan In-Reply-To: <20260924135201.850038-3-suzuki.poulose@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: N0gGWfqYvFYnpvDViSCRws6iRS9l6DdYLrxaZYgspRg_1790315015 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/24/26 11:51 PM, Suzuki K Poulose wrote: > From: Steven Price > > Query the RMI version number and check if it is a compatible version. > The first two feature registers are read and exposed for future code to > use. > > We only support this for Little Endian kernels, the Big Endian kernel > support is anyway marked BROKEN and is being removed. > > Signed-off-by: Steven Price > Co-developed-by: Suzuki K Poulose > Signed-off-by: Suzuki K Poulose > --- > v19: > * Read all implemented RmiFeatureRegisters - 5 > * Use ARRAY_SIZE(rmi_feat_reg_cache) for the loop in rmi_read_features() > * Fold rmi_features() into rmi_read_features > * Fix comment for rmi_smccc_invoke() > * Drop default y > * Add retry for RMI_BLOCKED and return to caller > v18: > * Always use arm_smccc_1_2_invoke() for all RMIs making sure the unsused > parameters are 0 - Sashiko > * Move rmi_features() calls away from the arm-rmi-cmds.h to rmi.c - Gavin > v17: > * Rename ARM_RMM to ARM_RMM_RMI to make it easier to add Guest facing RSI > support, which is also in progress > v16: > * Update Kconfig text to include PCIe TDISP. > * Export rmi_feat_reg() here rather than in a later commit. > v15: > * The code is moved again, this time into the 'firmware' directory. > v14: > * This moves the basic RMI setup into the 'kernel' directory. This is > because RMI will be used for some features outside of KVM so should > be available even if KVM isn't compiled in. > --- > arch/arm64/Kconfig | 1 + > arch/arm64/kernel/cpufeature.c | 1 + > drivers/firmware/Kconfig | 1 + > drivers/firmware/Makefile | 1 + > drivers/firmware/arm_rmm/Kconfig | 25 +++++++ > drivers/firmware/arm_rmm/Makefile | 2 + > drivers/firmware/arm_rmm/rmi.c | 109 ++++++++++++++++++++++++++++++ > include/linux/arm-rmi-cmds.h | 48 +++++++++++++ > 8 files changed, 188 insertions(+) > create mode 100644 drivers/firmware/arm_rmm/Kconfig > create mode 100644 drivers/firmware/arm_rmm/Makefile > create mode 100644 drivers/firmware/arm_rmm/rmi.c > create mode 100644 include/linux/arm-rmi-cmds.h > [...] > diff --git a/drivers/firmware/arm_rmm/Makefile b/drivers/firmware/arm_rmm/Makefile > new file mode 100644 > index 0000000000000..65171988fdcae > --- /dev/null > +++ b/drivers/firmware/arm_rmm/Makefile > @@ -0,0 +1,2 @@ > + > +obj-$(CONFIG_ARM_RMM_RMI) = rmi.o Unnecessary blank line at the top in Makefile. Besides, why doesn't this come as below? :) obj-$(CONFIG_ARM_RMM_RMI) += rmi.o Thanks, Gavin