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Wed, 19 Jun 2024 16:51:51 +0000 (GMT) Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA05.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 45JGpone013566 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Jun 2024 16:51:50 GMT Received: from hu-bjorande-lv.qualcomm.com (10.49.16.6) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 19 Jun 2024 09:51:49 -0700 Date: Wed, 19 Jun 2024 09:51:48 -0700 From: Bjorn Andersson To: Mukesh Ojha CC: Dmitry Baryshkov , Krzysztof Kozlowski , Komal Bajaj , Catalin Marinas , Will Deacon , Konrad Dybcio , Srinivas Kandagatla , , , Subject: Re: [PATCH] arm64: defconfig: Enable secure QFPROM driver Message-ID: References: <20240619105642.18947-1-quic_kbajaj@quicinc.com> <5582a2a0-c772-4573-9d55-2f963cb87df1@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: C4yrpiKk4IbeQd86rHYIvzacyxOj0FSz X-Proofpoint-GUID: C4yrpiKk4IbeQd86rHYIvzacyxOj0FSz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-19_02,2024-06-19_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 adultscore=0 impostorscore=0 clxscore=1015 mlxscore=0 spamscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406190127 On Wed, Jun 19, 2024 at 10:08:10PM +0530, Mukesh Ojha wrote: > On Wed, Jun 19, 2024 at 04:14:50PM +0300, Dmitry Baryshkov wrote: > > On Wed, Jun 19, 2024 at 05:40:42PM GMT, Mukesh Ojha wrote: > > > On Wed, Jun 19, 2024 at 01:08:48PM +0200, Krzysztof Kozlowski wrote: > > > > On 19/06/2024 12:56, Komal Bajaj wrote: > > > > > Enable the secure QFPROM driver which is used by QDU1000 > > > > > > > > Qualcomm QDU1000. You are changing kernel-wide defconfig, not some > > > > Qualcomm downstream stuff. > > > > > > > > > platform for reading the secure qfprom region to get the > > > > > DDR channel configuration. > > > > > > > > > > Signed-off-by: Komal Bajaj > > > > > --- > > > > > arch/arm64/configs/defconfig | 1 + > > > > > 1 file changed, 1 insertion(+) > > > > > > > > > > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig > > > > > index 838b4466d6f6..c940437ae1b3 100644 > > > > > --- a/arch/arm64/configs/defconfig > > > > > +++ b/arch/arm64/configs/defconfig > > > > > @@ -1575,6 +1575,7 @@ CONFIG_NVMEM_LAYERSCAPE_SFP=m > > > > > CONFIG_NVMEM_MESON_EFUSE=m > > > > > CONFIG_NVMEM_MTK_EFUSE=y > > > > > CONFIG_NVMEM_QCOM_QFPROM=y > > > > > +CONFIG_NVMEM_QCOM_SEC_QFPROM=y > > > > > > > > Module > > > > > > Should not this be inline with what CONFIG_NVMEM_QCOM_QFPROM is having ? > > > Either both CONFIG_NVMEM_QCOM_QFPROM and CONFIG_NVMEM_QCOM_SEC_QFPROM > > > should be m or both y > > > > Looking back in time, CONFIG_NVMEM_QCOM_QFPROM was enabled as built-in > > to get TSENS to work (which makes sense, we don't want the CPUs to > > burn). What the actual users for NVMEM_QCOM_SEC_QFPROM? > > > CONFIG_NVMEM_QCOM_QFPROM and CONFIG_NVMEM_QCOM_SEC_QFPROM are similar driver > for same device and only difference is register region lies in secure space > for the latter; > > Currently, LLCC is the only client for CONFIG_NVMEM_QCOM_SEC_QFPROM, however > if someday if the region lies in non-secure space in that case, client > started depending on CONFIG_NVMEM_QCOM_QFPROM. > > It reminds me, we have not yet put depends on for LLCC on NVMEM_QCOM_SEC_QFPROM > doing which is resulting in recursive dependency[1]. > Kconfig "depends on" describes build time dependencies and LLCC doesn't depend on NVMEM_QCOM_SEC_QFPROM. It does depend on nvmem_cell_read_u8() being defined, but as CONFIG_NVMEM is bool there will either be a proper implementation (=y) or a static inline stub (=n) of this function, so we don't need to describe this dependency. > It looks we need to select NVMEM_QCOM_SEC_QFPROM from QCOM_LLCC config and that > may not need config enablement here. > This is a runtime dependency, created through the nvmem framework by the relationship defined in DeviceTree. We don't describe those. Regards, Bjorn > [1] > fs/sysfs/Kconfig:2:error: recursive dependency detected! > fs/sysfs/Kconfig:2: symbol SYSFS is selected by CONFIGFS_FS > fs/configfs/Kconfig:2: symbol CONFIGFS_FS is selected by GPIO_SIM > drivers/gpio/Kconfig:1884: symbol GPIO_SIM depends on GPIOLIB > drivers/gpio/Kconfig:6: symbol GPIOLIB is selected by I2C_MUX_LTC4306 > drivers/i2c/muxes/Kconfig:47: symbol I2C_MUX_LTC4306 depends on I2C_MUX > drivers/i2c/Kconfig:62: symbol I2C_MUX is selected by DRM_SII902X > drivers/gpu/drm/bridge/Kconfig:270: symbol DRM_SII902X depends on DRM_BRIDGE > drivers/gpu/drm/bridge/Kconfig:2: symbol DRM_BRIDGE is selected by DRM_MSM > drivers/gpu/drm/msm/Kconfig:3: symbol DRM_MSM depends on QCOM_LLCC > drivers/soc/qcom/Kconfig:47: symbol QCOM_LLCC depends on NVMEM_QCOM_SEC_QFPROM > drivers/nvmem/Kconfig:230: symbol NVMEM_QCOM_SEC_QFPROM depends on NVMEM > drivers/nvmem/Kconfig:2: symbol NVMEM is selected by EEPROM_AT24 > drivers/misc/eeprom/Kconfig:4: symbol EEPROM_AT24 depends on SYSFS > For a resolution refer to Documentation/kbuild/kconfig-language.rst > > -Mukesh > > > > > > > > > -Mukesh > > > > > > > > > CONFIG_NVMEM_RMEM=m > > > > > CONFIG_NVMEM_ROCKCHIP_EFUSE=y > > > > > CONFIG_NVMEM_ROCKCHIP_OTP=y > > > > > -- > > > > > 2.42.0 > > > > > > > > > > > > > Best regards, > > > > Krzysztof > > > > > > > > -- > > With best wishes > > Dmitry