From patchwork Wed Nov 22 05:38:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gaurav Kashyap X-Patchwork-Id: 13464044 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="F56u2fGg" Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 795EB90; Tue, 21 Nov 2023 21:40:12 -0800 (PST) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AM4tZpx016686; Wed, 22 Nov 2023 05:40:09 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=1P+c/QKd2anuz5vciFoCq85/AmWhOFlwrdcxxiL2gRo=; b=F56u2fGgd5xfNNiBVNdM998HJCqtNie2uLRH+vIp7dPLbPulRs2JnN2tjC5mNZfGSWLb qDRSpR8CDFdIDoC/+p7/55KPZAVKRnH4dqBPyXE7dZhkrqVpiA2G41AOyPml8eE75iwb mDFXs6MFj9M1iMuQnWFeIxX6By8pyc+QR7+xRlRpAUoxh+jjPnyDP16zm3vW8amB0F0S Yp786DXbCZikGb4JwAGxGkioQUVO+qEgkG3v5hPuyoT9gkL/RurIpFCvZzoLnvgcJwcK ZymAgn+cMuHTO0wwcD2XArgVXwEqVQL87PiUq+tJbtqTxMcCk5RViHJm/rrmp4OK8apU 1g== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3ugu54and6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 Nov 2023 05:40:09 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3AM5e80B025775 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 Nov 2023 05:40:08 GMT Received: from hu-gaurkash-lv.qualcomm.com (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 21 Nov 2023 21:40:00 -0800 From: Gaurav Kashyap To: , , , , CC: , , , , , , , , Gaurav Kashyap Subject: [PATCH v3 03/12] soc: qcom: ice: add hwkm support in ice Date: Tue, 21 Nov 2023 21:38:08 -0800 Message-ID: <20231122053817.3401748-4-quic_gaurkash@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231122053817.3401748-1-quic_gaurkash@quicinc.com> References: <20231122053817.3401748-1-quic_gaurkash@quicinc.com> Precedence: bulk X-Mailing-List: linux-fscrypt@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: -hReIgu2hNKcp-5UrCABiVaDFvM7d0E4 X-Proofpoint-ORIG-GUID: -hReIgu2hNKcp-5UrCABiVaDFvM7d0E4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-22_03,2023-11-21_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 bulkscore=0 phishscore=0 impostorscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 mlxlogscore=869 adultscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311220040 Qualcomm's ICE (Inline Crypto Engine) contains a proprietary key management hardware called Hardware Key Manager (HWKM). This patch integrates HWKM support in ICE when it is available. HWKM primarily provides hardware wrapped key support where the ICE (storage) keys are not available in software and protected in hardware. Signed-off-by: Gaurav Kashyap --- drivers/soc/qcom/ice.c | 133 ++++++++++++++++++++++++++++++++++++++++- include/soc/qcom/ice.h | 1 + 2 files changed, 133 insertions(+), 1 deletion(-) diff --git a/drivers/soc/qcom/ice.c b/drivers/soc/qcom/ice.c index 6f941d32fffb..adf9cab848fa 100644 --- a/drivers/soc/qcom/ice.c +++ b/drivers/soc/qcom/ice.c @@ -26,6 +26,19 @@ #define QCOM_ICE_REG_FUSE_SETTING 0x0010 #define QCOM_ICE_REG_BIST_STATUS 0x0070 #define QCOM_ICE_REG_ADVANCED_CONTROL 0x1000 +#define QCOM_ICE_REG_CONTROL 0x0 +/* QCOM ICE HWKM registers */ +#define QCOM_ICE_REG_HWKM_TZ_KM_CTL 0x1000 +#define QCOM_ICE_REG_HWKM_TZ_KM_STATUS 0x1004 +#define QCOM_ICE_REG_HWKM_BANK0_BANKN_IRQ_STATUS 0x2008 +#define QCOM_ICE_REG_HWKM_BANK0_BBAC_0 0x5000 +#define QCOM_ICE_REG_HWKM_BANK0_BBAC_1 0x5004 +#define QCOM_ICE_REG_HWKM_BANK0_BBAC_2 0x5008 +#define QCOM_ICE_REG_HWKM_BANK0_BBAC_3 0x500C +#define QCOM_ICE_REG_HWKM_BANK0_BBAC_4 0x5010 + +#define QCOM_ICE_HWKM_BIST_DONE_V1_VAL 0x11 +#define QCOM_ICE_HWKM_BIST_DONE_V2_VAL 0x287 /* BIST ("built-in self-test") status flags */ #define QCOM_ICE_BIST_STATUS_MASK GENMASK(31, 28) @@ -34,6 +47,9 @@ #define QCOM_ICE_FORCE_HW_KEY0_SETTING_MASK 0x2 #define QCOM_ICE_FORCE_HW_KEY1_SETTING_MASK 0x4 +#define QCOM_ICE_HWKM_REG_OFFSET 0x8000 +#define HWKM_OFFSET(reg) ((reg) + QCOM_ICE_HWKM_REG_OFFSET) + #define qcom_ice_writel(engine, val, reg) \ writel((val), (engine)->base + (reg)) @@ -46,6 +62,9 @@ struct qcom_ice { struct device_link *link; struct clk *core_clk; + u8 hwkm_version; + bool use_hwkm; + bool hwkm_init_complete; }; static bool qcom_ice_check_supported(struct qcom_ice *ice) @@ -63,8 +82,26 @@ static bool qcom_ice_check_supported(struct qcom_ice *ice) return false; } + if (major >= 4 || (major == 3 && minor == 2 && step >= 1)) + ice->hwkm_version = 2; + else if (major == 3 && minor == 2) + ice->hwkm_version = 1; + else + ice->hwkm_version = 0; + + if (ice->hwkm_version == 0) + ice->use_hwkm = false; + dev_info(dev, "Found QC Inline Crypto Engine (ICE) v%d.%d.%d\n", major, minor, step); + if (!ice->hwkm_version) + dev_info(dev, "QC ICE HWKM (Hardware Key Manager) not supported"); + else + dev_info(dev, "QC ICE HWKM (Hardware Key Manager) version = %d", + ice->hwkm_version); + + if (!ice->use_hwkm) + dev_info(dev, "QC ICE HWKM (Hardware Key Manager) not used"); /* If fuses are blown, ICE might not work in the standard way. */ regval = qcom_ice_readl(ice, QCOM_ICE_REG_FUSE_SETTING); @@ -113,10 +150,14 @@ static void qcom_ice_optimization_enable(struct qcom_ice *ice) * fails, so we needn't do it in software too, and (c) properly testing * storage encryption requires testing the full storage stack anyway, * and not relying on hardware-level self-tests. + * + * However, we still care about if HWKM BIST failed (when supported) as + * important functionality would fail later, so disable hwkm on failure. */ static int qcom_ice_wait_bist_status(struct qcom_ice *ice) { u32 regval; + u32 bist_done_val; int err; err = readl_poll_timeout(ice->base + QCOM_ICE_REG_BIST_STATUS, @@ -125,15 +166,95 @@ static int qcom_ice_wait_bist_status(struct qcom_ice *ice) if (err) dev_err(ice->dev, "Timed out waiting for ICE self-test to complete\n"); + if (ice->use_hwkm) { + bist_done_val = (ice->hwkm_version == 1) ? + QCOM_ICE_HWKM_BIST_DONE_V1_VAL : + QCOM_ICE_HWKM_BIST_DONE_V2_VAL; + if (qcom_ice_readl(ice, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_TZ_KM_STATUS)) != + bist_done_val) { + dev_warn(ice->dev, "HWKM BIST error\n"); + ice->use_hwkm = false; + } + } return err; } +static void qcom_ice_enable_standard_mode(struct qcom_ice *ice) +{ + u32 val = 0; + + if (!ice->use_hwkm) + return; + + /* + * When ICE is in standard (hwkm) mode, it supports HW wrapped + * keys, and when it is in legacy mode, it only supports standard + * (non HW wrapped) keys. + * + * Put ICE in standard mode, ICE defaults to legacy mode. + * Legacy mode - ICE HWKM slave not supported. + * Standard mode - ICE HWKM slave supported. + * + * Depending on the version of HWKM, it is controlled by different + * registers in ICE. + */ + if (ice->hwkm_version >= 2) { + val = qcom_ice_readl(ice, QCOM_ICE_REG_CONTROL); + val = val & 0xFFFFFFFE; + qcom_ice_writel(ice, val, QCOM_ICE_REG_CONTROL); + } else { + qcom_ice_writel(ice, 0x7, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_TZ_KM_CTL)); + } +} + +static void qcom_ice_hwkm_init(struct qcom_ice *ice) +{ + if (!ice->use_hwkm) + return; + + /* Disable CRC checks. This HWKM feature is not used. */ + qcom_ice_writel(ice, 0x6, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_TZ_KM_CTL)); + + /* + * Give register bank of the HWKM slave access to read and modify + * the keyslots in ICE HWKM slave. Without this, trustzone will not + * be able to program keys into ICE. + */ + qcom_ice_writel(ice, 0xFFFFFFFF, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BBAC_0)); + qcom_ice_writel(ice, 0xFFFFFFFF, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BBAC_1)); + qcom_ice_writel(ice, 0xFFFFFFFF, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BBAC_2)); + qcom_ice_writel(ice, 0xFFFFFFFF, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BBAC_3)); + qcom_ice_writel(ice, 0xFFFFFFFF, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BBAC_4)); + + /* Clear HWKM response FIFO before doing anything */ + qcom_ice_writel(ice, 0x8, + HWKM_OFFSET(QCOM_ICE_REG_HWKM_BANK0_BANKN_IRQ_STATUS)); +} + int qcom_ice_enable(struct qcom_ice *ice) { + int err; + qcom_ice_low_power_mode_enable(ice); qcom_ice_optimization_enable(ice); - return qcom_ice_wait_bist_status(ice); + qcom_ice_enable_standard_mode(ice); + + err = qcom_ice_wait_bist_status(ice); + if (err) + return err; + + qcom_ice_hwkm_init(ice); + + return err; } EXPORT_SYMBOL_GPL(qcom_ice_enable); @@ -149,6 +270,8 @@ int qcom_ice_resume(struct qcom_ice *ice) return err; } + qcom_ice_enable_standard_mode(ice); + qcom_ice_hwkm_init(ice); return qcom_ice_wait_bist_status(ice); } EXPORT_SYMBOL_GPL(qcom_ice_resume); @@ -205,6 +328,12 @@ int qcom_ice_evict_key(struct qcom_ice *ice, int slot) } EXPORT_SYMBOL_GPL(qcom_ice_evict_key); +bool qcom_ice_hwkm_supported(struct qcom_ice *ice) +{ + return ice->use_hwkm; +} +EXPORT_SYMBOL_GPL(qcom_ice_hwkm_supported); + static struct qcom_ice *qcom_ice_create(struct device *dev, void __iomem *base) { @@ -239,6 +368,8 @@ static struct qcom_ice *qcom_ice_create(struct device *dev, engine->core_clk = devm_clk_get_enabled(dev, NULL); if (IS_ERR(engine->core_clk)) return ERR_CAST(engine->core_clk); + engine->use_hwkm = of_property_read_bool(dev->of_node, + "qcom,ice-use-hwkm"); if (!qcom_ice_check_supported(engine)) return ERR_PTR(-EOPNOTSUPP); diff --git a/include/soc/qcom/ice.h b/include/soc/qcom/ice.h index 9dd835dba2a7..1f52e82e3e1c 100644 --- a/include/soc/qcom/ice.h +++ b/include/soc/qcom/ice.h @@ -34,5 +34,6 @@ int qcom_ice_program_key(struct qcom_ice *ice, const struct blk_crypto_key *bkey, u8 data_unit_size, int slot); int qcom_ice_evict_key(struct qcom_ice *ice, int slot); +bool qcom_ice_hwkm_supported(struct qcom_ice *ice); struct qcom_ice *of_qcom_ice_get(struct device *dev); #endif /* __QCOM_ICE_H__ */