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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB33EC433E6 for ; Thu, 18 Mar 2021 02:11:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7222F64F62 for ; Thu, 18 Mar 2021 02:11:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230227AbhCRCKq (ORCPT ); Wed, 17 Mar 2021 22:10:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229702AbhCRCKZ (ORCPT ); Wed, 17 Mar 2021 22:10:25 -0400 Received: from mail-ot1-x336.google.com (mail-ot1-x336.google.com [IPv6:2607:f8b0:4864:20::336]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38EEEC06175F for ; Wed, 17 Mar 2021 19:10:25 -0700 (PDT) Received: by mail-ot1-x336.google.com with SMTP id w31-20020a9d36220000b02901f2cbfc9743so3500914otb.7 for ; Wed, 17 Mar 2021 19:10:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EmLn8rZvApz0CEK+2n4J5E4ndQ/u3PQvps0+HiUUndQ=; b=IYZu/iRExH+qF3oPFMBhjXkesfxGZvxUuCAsL59J7g0Ir/FM9XdTLKhYblHv8dBdoe 5a5OVxK6C8kL+ONV5e2Ls3n0AW01o1Lt6zPiGMuxRVaysLJArU1/h9PDrSX8FhH7/3K/ Ykdk36RJgeunBwPJqvVkm/k8gzdbRvWSeCT+lUDbpvWjSBY8aV2lDylV82D0ajr9muTc VtIjUAxJXSATYb/Fio9Mi5w9QmpeAPAVtgPijd0pNOE2Oy0qpIX7InsitPKnw9c1yOad KtsJ6Ta0rz3PPXXg7C5yzNl6xjIDbI6Ln3inhqUuS3DSPn27tx51fjRC7RzMhwAosqET HxuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=EmLn8rZvApz0CEK+2n4J5E4ndQ/u3PQvps0+HiUUndQ=; b=sVv8pF/v4Lg5eP7RQyMYWF9BFK8MJpSNj26srMlibEMkXzXACpjBq1yk3Y0M/84NvA LEWDN1GVCXVcqpEIk+NJJt4w77be6NKFqL76uhQX4yb+bedahLsAkfzSLwM5ZdIscI4q UlyTN0ySVYpsL2L/YohF4rJ+OYANk/5PGXCuR2LP5DG/cE1KHonEsBmKNtUoYuWv8ujw 2c5CHOM+5kxDHgeoHqia/SIz7rFwRr+rFi+JO9zu/b8cE9VbHel2fFVUFcGTlJ1bC0S9 zbWM3g1x3wXRGOosp1YmS/CT37Uiebau6Z7Iu8L7ryyOcgcRShh9MnFoIVmgQgfAdwAR uj7Q== X-Gm-Message-State: AOAM532fL9wZUI4d/j2Wmnwj00hlW5K2/FJ76MnpdqQaZFey0hTpsldL v2mo7TDIV62pdiK6S/eqEOs8ig== X-Google-Smtp-Source: ABdhPJzkvAJJcqb04nH9kaQaty1xkwr8wUcYvda48HhOce67br9qznOZwO56g6l8fKsOrih1uXtLgg== X-Received: by 2002:a9d:2226:: with SMTP id o35mr5533438ota.242.1616033424518; Wed, 17 Mar 2021 19:10:24 -0700 (PDT) Received: from blackbox.Home ([2806:10b7:2:e880:2c32:cfff:fe8e:de1f]) by smtp.gmail.com with ESMTPSA id p64sm212511oib.57.2021.03.17.19.10.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Mar 2021 19:10:23 -0700 (PDT) From: =?UTF-8?q?An=C3=ADbal=20Lim=C3=B3n?= To: bjorn.andersson@linaro.org Cc: agross@kernel.org, anibal.limon@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org, loic.poulain@linaro.org, mathieu.poirier@linaro.org, ohad@wizery.com Subject: [PATCH] remoteproc: qcom: wcnss: Fix race with iris probe Date: Wed, 17 Mar 2021 20:10:21 -0600 Message-Id: <20210318021021.1127314-1-anibal.limon@linaro.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312002251.3273013-1-bjorn.andersson@linaro.org> References: <20210312002251.3273013-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bjorn Andersson The remoteproc driver is split between the responsibilities of getting the SoC-internal ARM core up and running and the external RF (aka "Iris") part configured. In order to satisfy the regulator framework's need of a struct device * to look up supplies this was implemented as two different drivers, using of_platform_populate() in the remoteproc part to probe the iris part. Unfortunately it's possible that the iris part probe defers on yet not available regulators and an attempt to start the remoteproc will have to be rejected, until this has been resolved. But there's no useful mechanism of knowing when this would be. Instead replace the of_platform_populate() and the iris probe with a function that rolls its own struct device, with the relevant of_node associated that is enough to acquire regulators and clocks specified in the DT node and that may propagate the EPROBE_DEFER back to the wcnss device's probe. Reported-by: Anibal Limon Reported-by: Loic Poulain Signed-off-by: Bjorn Andersson Tested-by: Anibal Limon --- drivers/remoteproc/qcom_wcnss.c | 52 ++++-------- drivers/remoteproc/qcom_wcnss.h | 4 +- drivers/remoteproc/qcom_wcnss_iris.c | 120 +++++++++++++++++---------- 3 files changed, 91 insertions(+), 85 deletions(-) diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c index 2a6a23cb14ca..dcf21f12fe7e 100644 --- a/drivers/remoteproc/qcom_wcnss.c +++ b/drivers/remoteproc/qcom_wcnss.c @@ -142,18 +142,6 @@ static const struct wcnss_data pronto_v2_data = { .num_vregs = 1, }; -void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss, - struct qcom_iris *iris, - bool use_48mhz_xo) -{ - mutex_lock(&wcnss->iris_lock); - - wcnss->iris = iris; - wcnss->use_48mhz_xo = use_48mhz_xo; - - mutex_unlock(&wcnss->iris_lock); -} - static int wcnss_load(struct rproc *rproc, const struct firmware *fw) { struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv; @@ -633,12 +621,20 @@ static int wcnss_probe(struct platform_device *pdev) goto detach_pds; } + wcnss->iris = qcom_iris_probe(&pdev->dev, &wcnss->use_48mhz_xo); + if (IS_ERR(wcnss->iris)) { + ret = PTR_ERR(wcnss->iris); + goto detach_pds; + } + ret = rproc_add(rproc); if (ret) - goto detach_pds; + goto remove_iris; - return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + return 0; +remove_iris: + qcom_iris_remove(wcnss->iris); detach_pds: wcnss_release_pds(wcnss); free_rproc: @@ -651,9 +647,10 @@ static int wcnss_remove(struct platform_device *pdev) { struct qcom_wcnss *wcnss = platform_get_drvdata(pdev); - of_platform_depopulate(&pdev->dev); + qcom_iris_remove(wcnss->iris); - qcom_smem_state_put(wcnss->state); + if (wcnss->state) + qcom_smem_state_put(wcnss->state); rproc_del(wcnss->rproc); qcom_remove_sysmon_subdev(wcnss->sysmon); @@ -681,28 +678,7 @@ static struct platform_driver wcnss_driver = { }, }; -static int __init wcnss_init(void) -{ - int ret; - - ret = platform_driver_register(&wcnss_driver); - if (ret) - return ret; - - ret = platform_driver_register(&qcom_iris_driver); - if (ret) - platform_driver_unregister(&wcnss_driver); - - return ret; -} -module_init(wcnss_init); - -static void __exit wcnss_exit(void) -{ - platform_driver_unregister(&qcom_iris_driver); - platform_driver_unregister(&wcnss_driver); -} -module_exit(wcnss_exit); +module_platform_driver(wcnss_driver); MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Wireless Subsystem"); MODULE_LICENSE("GPL v2"); diff --git a/drivers/remoteproc/qcom_wcnss.h b/drivers/remoteproc/qcom_wcnss.h index 62c8682d0a92..6d01ee6afa7f 100644 --- a/drivers/remoteproc/qcom_wcnss.h +++ b/drivers/remoteproc/qcom_wcnss.h @@ -17,9 +17,9 @@ struct wcnss_vreg_info { bool super_turbo; }; +struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo); +void qcom_iris_remove(struct qcom_iris *iris); int qcom_iris_enable(struct qcom_iris *iris); void qcom_iris_disable(struct qcom_iris *iris); -void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss, struct qcom_iris *iris, bool use_48mhz_xo); - #endif diff --git a/drivers/remoteproc/qcom_wcnss_iris.c b/drivers/remoteproc/qcom_wcnss_iris.c index 169acd305ae3..09720ddddc85 100644 --- a/drivers/remoteproc/qcom_wcnss_iris.c +++ b/drivers/remoteproc/qcom_wcnss_iris.c @@ -17,7 +17,7 @@ #include "qcom_wcnss.h" struct qcom_iris { - struct device *dev; + struct device dev; struct clk *xo_clk; @@ -75,7 +75,7 @@ int qcom_iris_enable(struct qcom_iris *iris) ret = clk_prepare_enable(iris->xo_clk); if (ret) { - dev_err(iris->dev, "failed to enable xo clk\n"); + dev_err(&iris->dev, "failed to enable xo clk\n"); goto disable_regulators; } @@ -93,43 +93,90 @@ void qcom_iris_disable(struct qcom_iris *iris) regulator_bulk_disable(iris->num_vregs, iris->vregs); } -static int qcom_iris_probe(struct platform_device *pdev) +static const struct of_device_id iris_of_match[] = { + { .compatible = "qcom,wcn3620", .data = &wcn3620_data }, + { .compatible = "qcom,wcn3660", .data = &wcn3660_data }, + { .compatible = "qcom,wcn3660b", .data = &wcn3680_data }, + { .compatible = "qcom,wcn3680", .data = &wcn3680_data }, + {} +}; + +static void qcom_iris_release(struct device *dev) +{ + struct qcom_iris *iris = container_of(dev, struct qcom_iris, dev); + + of_node_put(iris->dev.of_node); + kfree(iris); +} + +struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo) { + const struct of_device_id *match; const struct iris_data *data; - struct qcom_wcnss *wcnss; + struct device_node *of_node; struct qcom_iris *iris; int ret; int i; - iris = devm_kzalloc(&pdev->dev, sizeof(struct qcom_iris), GFP_KERNEL); - if (!iris) - return -ENOMEM; + of_node = of_get_child_by_name(parent->of_node, "iris"); + if (!of_node) { + dev_err(parent, "No child node \"iris\" found\n"); + return ERR_PTR(-EINVAL); + } + + iris = kzalloc(sizeof(*iris), GFP_KERNEL); + if (!iris) { + of_node_put(of_node); + return ERR_PTR(-ENOMEM); + } + + device_initialize(&iris->dev); + iris->dev.parent = parent; + iris->dev.release = qcom_iris_release; + iris->dev.of_node = of_node; + + dev_set_name(&iris->dev, "%s.iris", dev_name(parent)); + + ret = device_add(&iris->dev); + if (ret) { + put_device(&iris->dev); + return ERR_PTR(ret); + } + + match = of_match_device(iris_of_match, &iris->dev); + if (!match) { + dev_err(&iris->dev, "no matching compatible for iris\n"); + ret = -EINVAL; + goto err_device_del; + } - data = of_device_get_match_data(&pdev->dev); - wcnss = dev_get_drvdata(pdev->dev.parent); + data = match->data; - iris->xo_clk = devm_clk_get(&pdev->dev, "xo"); + iris->xo_clk = devm_clk_get(&iris->dev, "xo"); if (IS_ERR(iris->xo_clk)) { - if (PTR_ERR(iris->xo_clk) != -EPROBE_DEFER) - dev_err(&pdev->dev, "failed to acquire xo clk\n"); - return PTR_ERR(iris->xo_clk); + ret = PTR_ERR(iris->xo_clk); + if (ret != -EPROBE_DEFER) + dev_err(&iris->dev, "failed to acquire xo clk\n"); + goto err_device_del; } iris->num_vregs = data->num_vregs; - iris->vregs = devm_kcalloc(&pdev->dev, + iris->vregs = devm_kcalloc(&iris->dev, iris->num_vregs, sizeof(struct regulator_bulk_data), GFP_KERNEL); - if (!iris->vregs) - return -ENOMEM; + if (!iris->vregs) { + ret = -ENOMEM; + goto err_device_del; + } for (i = 0; i < iris->num_vregs; i++) iris->vregs[i].supply = data->vregs[i].name; - ret = devm_regulator_bulk_get(&pdev->dev, iris->num_vregs, iris->vregs); + ret = devm_regulator_bulk_get(&iris->dev, iris->num_vregs, iris->vregs); if (ret) { - dev_err(&pdev->dev, "failed to get regulators\n"); - return ret; + dev_err(&iris->dev, "failed to get regulators\n"); + goto err_device_del; } for (i = 0; i < iris->num_vregs; i++) { @@ -143,34 +190,17 @@ static int qcom_iris_probe(struct platform_device *pdev) data->vregs[i].load_uA); } - qcom_wcnss_assign_iris(wcnss, iris, data->use_48mhz_xo); - - return 0; -} + *use_48mhz_xo = data->use_48mhz_xo; -static int qcom_iris_remove(struct platform_device *pdev) -{ - struct qcom_wcnss *wcnss = dev_get_drvdata(pdev->dev.parent); + return iris; - qcom_wcnss_assign_iris(wcnss, NULL, false); +err_device_del: + device_del(&iris->dev); - return 0; + return ERR_PTR(ret); } -static const struct of_device_id iris_of_match[] = { - { .compatible = "qcom,wcn3620", .data = &wcn3620_data }, - { .compatible = "qcom,wcn3660", .data = &wcn3660_data }, - { .compatible = "qcom,wcn3660b", .data = &wcn3680_data }, - { .compatible = "qcom,wcn3680", .data = &wcn3680_data }, - {} -}; -MODULE_DEVICE_TABLE(of, iris_of_match); - -struct platform_driver qcom_iris_driver = { - .probe = qcom_iris_probe, - .remove = qcom_iris_remove, - .driver = { - .name = "qcom-iris", - .of_match_table = iris_of_match, - }, -}; +void qcom_iris_remove(struct qcom_iris *iris) +{ + device_del(&iris->dev); +} -- 2.30.1