From patchwork Mon Jul 15 15:56:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Ojha X-Patchwork-Id: 13733619 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9336E1171C; Mon, 15 Jul 2024 15:57:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721059042; cv=none; b=VqsR3k1SFAODrul+bhCjVaEtOIVYAglm8uL3SGDi4xtflBKxGxcBBaq/ktHdrGFnCx/ERsS0Ch282g+7fbf/E3rnH9JB+BBcQSHSH8mjhblA+WaH8lmcZwptbTyTiEj07rzBnsYZ2BI81lHwFCpz1a6z7E8E1+zmqwlAfpO0nr4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721059042; c=relaxed/simple; bh=ccuuPWS/kHndTJIROlan9HdA8UeYyOHGtUAvlJbG/iQ=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=BkTdMs8a0l20nQbt7abltS5/TViXpyy733xxScy9bavp9tp6fEv2X8V5EBwxsiNHz8MRY3WjG4PTUFlp6h+LMzMiP+mAkY/0gsJpVwEaC0QjZq5e1eTsVZPdpNuUohOsRHl+E+MjfeDiDl0f1XA5ZNVNAnXk49Gcs3O3KZB3lxw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=iB4wS/sz; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="iB4wS/sz" Received: from pps.filterd (m0279867.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 46FAQlhN003863; Mon, 15 Jul 2024 15:57:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=gCiFNnIZr3eKo25BFHugoK CzKuqWtkarMsaqT4Ce42U=; b=iB4wS/szosA7HlubTRbQLC7ivjO1HK/aBiUd1n ABDywGoWwA4IW3mXGy5IFj81fDmHFg+1M6XDgijhsh80WqwAeqnKyiu4yGg3E2Cf 3Memq506gAKiXR8C3+52r8HoqWcFywja1fjnY9i6afXBcadIH+boxQaMovVnQISp zyaYQfwilaqlyb14oZ6AwI2gru84kzGv0y8+KFRs+b6Uzrcpf0EZUS/kRvsVU2uq MzCwbQk/OqUVvqZl1GEEPAMBkk9Ve9KjJM58jyoMU7zewhn3/Ym0VqXLGiH/yfzK E7K5Z+OoOJeItMbfXv1atcsm24oPhjrIra3sFsEMWq4T/RZQ== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 40bf9ecveg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 15 Jul 2024 15:57:16 +0000 (GMT) Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.45.79.139]) by NASANPPMTA02.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 46FFvFoV019912 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 15 Jul 2024 15:57:16 GMT Received: from hu-mojha-hyd.qualcomm.com (10.80.80.8) by nasanex01c.na.qualcomm.com (10.45.79.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 15 Jul 2024 08:57:13 -0700 From: Mukesh Ojha To: , CC: , , "Mukesh Ojha" Subject: [PATCH v8 1/2] Firmware: qcom_scm: Refactor code to support multiple dload mode Date: Mon, 15 Jul 2024 21:26:54 +0530 Message-ID: <20240715155655.1811178-1-quic_mojha@quicinc.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01c.na.qualcomm.com (10.45.79.139) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: R3Myj2LezusXOa1AWCXS4XsT1hUeXVLa X-Proofpoint-GUID: R3Myj2LezusXOa1AWCXS4XsT1hUeXVLa 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=2024-07-15_10,2024-07-11_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 bulkscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 spamscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2407150126 Currently on Qualcomm SoC, download_mode is enabled if CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT is selected or passed a boolean value from command line. Refactor the code such that it supports multiple download modes and drop CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT config instead, give interface to set the download mode from module parameter while being backword compatible at the same time. Signed-off-by: Mukesh Ojha --- Change in v8: https://lore.kernel.org/lkml/20240109153200.12848-12-quic_mojha@quicinc.com/ - Rebased it on top of https://lore.kernel.org/lkml/20240708155332.4056479-1-quic_mojha@quicinc.com/ - Sending them separately as they are not dependent on kernel minidump driver as minidump as a download mode exists even without kernel driver and it can be enabled via SCM driver to collect firmware minidump. drivers/firmware/qcom/Kconfig | 11 ------ drivers/firmware/qcom/qcom_scm.c | 60 +++++++++++++++++++++++++++----- 2 files changed, 52 insertions(+), 19 deletions(-) diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig index 7f6eb4174734..33b282aaec01 100644 --- a/drivers/firmware/qcom/Kconfig +++ b/drivers/firmware/qcom/Kconfig @@ -40,17 +40,6 @@ config QCOM_TZMEM_MODE_SHMBRIDGE endchoice -config QCOM_SCM_DOWNLOAD_MODE_DEFAULT - bool "Qualcomm download mode enabled by default" - depends on QCOM_SCM - help - A device with "download mode" enabled will upon an unexpected - warm-restart enter a special debug mode that allows the user to - "download" memory content over USB for offline postmortem analysis. - The feature can be enabled/disabled on the kernel command line. - - Say Y here to enable "download mode" by default. - config QCOM_QSEECOM bool "Qualcomm QSEECOM interface driver" depends on QCOM_SCM=y diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 0f5ac346bda4..55955f675cd0 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -32,8 +33,7 @@ #include "qcom_scm.h" #include "qcom_tzmem.h" -static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT); -module_param(download_mode, bool, 0); +static u32 download_mode; struct qcom_scm { struct device *dev; @@ -134,6 +134,11 @@ static const char * const qcom_scm_convention_names[] = { [SMC_CONVENTION_LEGACY] = "smc legacy", }; +static const char * const download_mode_name[] = { + [QCOM_DLOAD_NODUMP] = "off", + [QCOM_DLOAD_FULLDUMP] = "full", +}; + static struct qcom_scm *__scm; static int qcom_scm_clk_enable(void) @@ -526,17 +531,16 @@ static int qcom_scm_io_rmw(phys_addr_t addr, unsigned int mask, unsigned int val return qcom_scm_io_writel(addr, new); } -static void qcom_scm_set_download_mode(bool enable) +static void qcom_scm_set_download_mode(u32 dload_mode) { - u32 val = enable ? QCOM_DLOAD_FULLDUMP : QCOM_DLOAD_NODUMP; int ret = 0; if (__scm->dload_mode_addr) { ret = qcom_scm_io_rmw(__scm->dload_mode_addr, QCOM_DLOAD_MASK, - FIELD_PREP(QCOM_DLOAD_MASK, val)); + FIELD_PREP(QCOM_DLOAD_MASK, dload_mode)); } else if (__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_BOOT_SET_DLOAD_MODE)) { - ret = __qcom_scm_set_dload_mode(__scm->dev, enable); + ret = __qcom_scm_set_dload_mode(__scm->dev, !!dload_mode); } else { dev_err(__scm->dev, "No available mechanism for setting download mode\n"); @@ -1886,6 +1890,46 @@ static irqreturn_t qcom_scm_irq_handler(int irq, void *data) return IRQ_HANDLED; } +static int get_download_mode(char *buffer, const struct kernel_param *kp) +{ + if (download_mode >= ARRAY_SIZE(download_mode_name)) + return sysfs_emit(buffer, "unknown mode\n"); + + return sysfs_emit(buffer, "%s\n", download_mode_name[download_mode]); +} + +static int set_download_mode(const char *val, const struct kernel_param *kp) +{ + bool tmp; + int ret; + + ret = sysfs_match_string(download_mode_name, val); + if (ret < 0) { + ret = kstrtobool(val, &tmp); + if (ret < 0) { + pr_err("qcom_scm: err: %d\n", ret); + return ret; + } + + ret = tmp ? 1 : 0; + } + + download_mode = ret; + if (__scm) + qcom_scm_set_download_mode(download_mode); + + return 0; +} + +static const struct kernel_param_ops download_mode_param_ops = { + .get = get_download_mode, + .set = set_download_mode, +}; + +module_param_cb(download_mode, &download_mode_param_ops, NULL, 0644); +MODULE_PARM_DESC(download_mode, + "download mode: off/0/N for no dump mode, full/on/1/Y for full dump mode"); + static int qcom_scm_probe(struct platform_device *pdev) { struct qcom_tzmem_pool_config pool_config; @@ -1950,7 +1994,7 @@ static int qcom_scm_probe(struct platform_device *pdev) __get_convention(); /* - * If requested enable "download mode", from this point on warmboot + * If "download mode" is requested, from this point on warmboot * will cause the boot stages to enter download mode, unless * disabled below by a clean shutdown/reboot. */ @@ -2001,7 +2045,7 @@ static int qcom_scm_probe(struct platform_device *pdev) static void qcom_scm_shutdown(struct platform_device *pdev) { /* Clean shutdown, disable download mode to allow normal restart */ - qcom_scm_set_download_mode(false); + qcom_scm_set_download_mode(QCOM_DLOAD_NODUMP); } static const struct of_device_id qcom_scm_dt_match[] = {