From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E026C7EE23 for ; Tue, 9 May 2023 16:06:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234838AbjEIQGj (ORCPT ); Tue, 9 May 2023 12:06:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231488AbjEIQGi (ORCPT ); Tue, 9 May 2023 12:06:38 -0400 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78C7D46B5; Tue, 9 May 2023 09:06:36 -0700 (PDT) Received: by mail-pg1-x530.google.com with SMTP id 41be03b00d2f7-52caed90d17so3337166a12.0; Tue, 09 May 2023 09:06:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1683648396; x=1686240396; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=3D71as6LJWsYMDTb4BiasqKDmId0LkGzfVkMgY6tMoc=; b=i8dhhnQhpe5/KpsAyTAlVssvMR0ux0o5onT9Qxzie9BfoGIHQ6SOniG0AlO8B8ZxcL 5ycfkMwgNjmSIibN/NNfkn5qZaljGAlKPr57vAGXYGktC0jXrY5E3SYQOEMfRwCeEQFL uKWsMhtcVzW3In+kDKdi2wn5Zt3T9g0umMlR3PVNGEAmEwpKDiQm8j3Nf2+fS8+b6wrQ slylNYxXZbljTUQPhSahBLwdE6akjNBDXMX3KSnJBc6J9/YegRPSLvDgCQi4f4sn080/ TTwiccVSfo0zo/TKN8B3VIRGxBT4XF5YWG9gNZVgUmrGAPLNalb6F/h0pDd29iRKFfen IzNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683648396; x=1686240396; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3D71as6LJWsYMDTb4BiasqKDmId0LkGzfVkMgY6tMoc=; b=FL9KIVU6CPp+vYH4I42K4NbiR3GC85wqxdLwqyjbY3ibrN/m7fE1oUZccGIZfEMsUo 8LLP4jwH7JscImeBcc+zCko5NAlonuhdLVg+7exS5rzr0D4EFCIf7A6zuVN2lEoOZG6Y iu8xqSbLsAsU3mPw5vFTsOVeQeY5vNgrVcDDXym6jZmRMo937o0e4mXL7C5/7e+faxgn bPwPIrY5NJUK0oUQJgPm2k83bfqGp1h2lJyzu98fRixKNInjJJYBi9FlZ8KHZdEa4AXA igZl8eC0beww4j+fzji17OsKCpY4pob8+bPS10B3zjLqloTMX0/kkWSjPsAyoWveke/h IVbw== X-Gm-Message-State: AC+VfDwjOfKcYCdMy7TZQntMYl+nOwEP38FEibbkA5qMLQo84hQiUkb4 sANt2I58TYdDP/Vfux2h7S0= X-Google-Smtp-Source: ACHHUZ6vq6rgO7usSQ6hQ8Rf6iwdW69I+IF91CuCUFV2Mybvsjlx3XmHs9ctzTW8ientqNcQ3qg9iA== X-Received: by 2002:a17:90a:ba8a:b0:240:f8a6:55c7 with SMTP id t10-20020a17090aba8a00b00240f8a655c7mr14101831pjr.20.1683648395618; Tue, 09 May 2023 09:06:35 -0700 (PDT) Received: from [192.168.50.148] (net-2-32-39-33.cust.vodafonedsl.it. [2.32.39.33]) by smtp.gmail.com with ESMTPSA id o6-20020a17090ac08600b00250ad795d72sm1599484pjs.44.2023.05.09.09.06.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 May 2023 09:06:34 -0700 (PDT) Message-ID: Date: Tue, 9 May 2023 18:06:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v3 09/18] soc: qcom: Add qcom's pstore minidump driver support Content-Language: en-US To: Mukesh Ojha , agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org, corbet@lwn.net, keescook@chromium.org, tony.luck@intel.com, gpiccoli@igalia.com, catalin.marinas@arm.com, will@kernel.org, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, linus.walleij@linaro.org, linux-gpio@vger.kernel.org, srinivas.kandagatla@linaro.org Cc: linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org References: <1683133352-10046-1-git-send-email-quic_mojha@quicinc.com> <1683133352-10046-10-git-send-email-quic_mojha@quicinc.com> From: Luca Stefani In-Reply-To: <1683133352-10046-10-git-send-email-quic_mojha@quicinc.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 03/05/23 19:02, Mukesh Ojha wrote: > This driver was inspired from the fact pstore ram region should be > fixed and boot firmware need to have awarness about this region, > so that it will be persistent across boot. But, there are many > QCOM SoC which does not support warm boot from hardware but they > have minidump support from the software, and for them, there is > no need of this pstore ram region to be fixed, but at the same > time have interest in the pstore frontends. So, this driver > get the dynamic reserved region from the ram and register the > ramoops platform device. > > +---------+ +---------+ +--------+ +---------+ > | console | | pmsg | | ftrace | | dmesg | > +---------+ +---------+ +--------+ +---------+ > | | | | > | | | | > +------------------------------------------+ > | > \ / > +----------------+ > (1) |pstore frontends| > +----------------+ > | > \ / > +------------------- + > (2) | pstore backend(ram)| > +--------------------+ > | > \ / > +--------------------+ > (3) |qcom_pstore_minidump| > +--------------------+ > | > \ / > +---------------+ > (4) | qcom_minidump | > +---------------+ > > This driver will route all the pstore front data to the stored > in qcom pstore reserved region and the reason of showing an > arrow from (3) to (4) as qcom_pstore_minidump driver will register > all the available frontends region with qcom minidump driver > in upcoming patch. > > Signed-off-by: Mukesh Ojha > --- > drivers/soc/qcom/Kconfig | 11 +++ > drivers/soc/qcom/Makefile | 1 + > drivers/soc/qcom/qcom_pstore_minidump.c | 116 ++++++++++++++++++++++++++++++++ > 3 files changed, 128 insertions(+) > create mode 100644 drivers/soc/qcom/qcom_pstore_minidump.c > > diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig > index 15c931e..afdc634 100644 > --- a/drivers/soc/qcom/Kconfig > +++ b/drivers/soc/qcom/Kconfig > @@ -293,4 +293,15 @@ config QCOM_MINIDUMP > these selective regions will be dumped instead of the entire DDR. > This saves significant amount of time and/or storage space. > > +config QCOM_PSTORE_MINIDUMP > + tristate "Pstore support for QCOM Minidump" > + depends on ARCH_QCOM > + depends on PSTORE_RAM > + depends on QCOM_MINIDUMP > + help > + Enablement of this driver ensures that ramoops region can be anywhere > + reserved in ram instead of being fixed address which needs boot firmware > + awareness. So, this driver creates plaform device and registers available > + frontend region with the Qualcomm's minidump driver. > + > endmenu > diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile > index 1ebe081..02d30d7 100644 > --- a/drivers/soc/qcom/Makefile > +++ b/drivers/soc/qcom/Makefile > @@ -34,3 +34,4 @@ obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) += kryo-l2-accessors.o > obj-$(CONFIG_QCOM_ICC_BWMON) += icc-bwmon.o > obj-$(CONFIG_QCOM_INLINE_CRYPTO_ENGINE) += ice.o > obj-$(CONFIG_QCOM_MINIDUMP) += qcom_minidump.o > +obj-$(CONFIG_QCOM_PSTORE_MINIDUMP) += qcom_pstore_minidump.o > diff --git a/drivers/soc/qcom/qcom_pstore_minidump.c b/drivers/soc/qcom/qcom_pstore_minidump.c > new file mode 100644 > index 0000000..8d58500 > --- /dev/null > +++ b/drivers/soc/qcom/qcom_pstore_minidump.c > @@ -0,0 +1,116 @@ > +// SPDX-License-Identifier: GPL-2.0-only > + > +/* > + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +struct qcom_ramoops_config { > + unsigned long record_size; > + unsigned long console_size; > + unsigned long ftrace_size; > + unsigned long pmsg_size; > + unsigned int mem_type; > + unsigned int flags; > + int max_reason; > +}; > + > +struct qcom_ramoops_dd { > + struct ramoops_platform_data qcom_ramoops_pdata; > + struct platform_device *ramoops_pdev; > +}; > + > +static struct qcom_ramoops_config default_ramoops_config = { > + .mem_type = 2, > + .record_size = 0x0, > + .console_size = 0x200000, > + .ftrace_size = 0x0, > + .pmsg_size = 0x0, > +}; This is effectively hard-cording the configuration of ramoops. Since the memory range is dynamic and by itself doesn't impose any limitation this should be configurable in the device-tree, like a standard ramoops entry backed by a memory range. I think this should provide the same interface/knobs as pstore-ram does, unless there's some known limitations to minidump, in which case those should be expressed. > + > +static struct qcom_ramoops_dd *qcom_rdd; > +static int qcom_ramoops_probe(struct platform_device *pdev) > +{ > + struct device_node *of_node = pdev->dev.of_node; > + struct device_node *node; > + const struct qcom_ramoops_config *cfg; > + struct ramoops_platform_data *pdata; > + struct reserved_mem *rmem; > + long ret; > + > + node = of_parse_phandle(of_node, "memory-region", 0); > + if (!node) > + return -ENODEV; > + > + rmem = of_reserved_mem_lookup(node); > + of_node_put(node); > + if (!rmem) { > + dev_err(&pdev->dev, "failed to locate DT /reserved-memory resource\n"); > + return -EINVAL; > + } > + > + qcom_rdd = devm_kzalloc(&pdev->dev, sizeof(*qcom_rdd), GFP_KERNEL); > + if (!qcom_rdd) > + return -ENOMEM; > + > + cfg = of_device_get_match_data(&pdev->dev); > + if (!cfg) { > + dev_err(&pdev->dev, "failed to get supported matched data\n"); > + return -ENOENT; > + } > + > + pdata = &qcom_rdd->qcom_ramoops_pdata; > + pdata->mem_size = rmem->size; > + pdata->mem_address = rmem->base; > + pdata->mem_type = cfg->mem_type; > + pdata->record_size = cfg->record_size; > + pdata->console_size = cfg->console_size; > + pdata->ftrace_size = cfg->ftrace_size; > + pdata->pmsg_size = cfg->pmsg_size; > + pdata->max_reason = KMSG_DUMP_PANIC; > + > + qcom_rdd->ramoops_pdev = platform_device_register_data(NULL, "ramoops", -1, > + pdata, sizeof(*pdata)); > + if (IS_ERR(qcom_rdd->ramoops_pdev)) { > + ret = PTR_ERR(qcom_rdd->ramoops_pdev); > + dev_err(&pdev->dev, "could not create platform device: %ld\n", ret); > + qcom_rdd->ramoops_pdev = NULL; > + } > + > + return ret; > +} > + > +static int qcom_ramoops_remove(struct platform_device *pdev) > +{ > + platform_device_unregister(qcom_rdd->ramoops_pdev); > + qcom_rdd->ramoops_pdev = NULL; > + > + return 0; > +} > + > +static const struct of_device_id qcom_ramoops_of_match[] = { > + { .compatible = "qcom,sm8450-ramoops-minidump", .data = &default_ramoops_config }, > + { .compatible = "qcom,ramoops-minidump", .data = &default_ramoops_config }, > + {} > +}; > + > +MODULE_DEVICE_TABLE(of, qcom_ramoops_of_match); > +static struct platform_driver qcom_ramoops_drv = { > + .driver = { > + .name = "qcom,ramoops-minidump", > + .of_match_table = qcom_ramoops_of_match, > + }, > + .probe = qcom_ramoops_probe, > + .remove = qcom_ramoops_remove, > +}; > + > +module_platform_driver(qcom_ramoops_drv); > + > +MODULE_DESCRIPTION("Qualcomm minidump pstore driver"); > +MODULE_LICENSE("GPL");