From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9AC6913A41E; Fri, 19 Apr 2024 18:15:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713550549; cv=none; b=Zh675fE+lD/1sF1X3ggGwCYp3MCflvc1jlw2RZojvJecyCTXnxDwnkyQ663poEyybAz6xUoEm5CvRG6+9i1kr78Onm2Bclle/gsgQ+gOITtbKSJl5155OGk7pihsl7A3AKoxZy8RB6RZQ81HbgqoBmetMUUbvAFoljhUVC+dQJM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713550549; c=relaxed/simple; bh=+f7tJdF9+iWpktOq4DFJwgvD+TASFb4Clo9fG5dop3U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fanpesOqVUH80uQkgbeOgTNYgagD7iF0YEWG+t26lyede8KZUJHRjFs3bgUd4x7ai/TMN3VG/2vH46lPlHhwGLOZCIoRSyR0gx5bRKug+Nm/xSqhA9O3ECtPNq8Skfodt7G2sywmtKH5lVoM4lfjjObkMGf2blQKo+gXXvqxGlg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AvdGZAdz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AvdGZAdz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF8A8C072AA; Fri, 19 Apr 2024 18:15:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713550549; bh=+f7tJdF9+iWpktOq4DFJwgvD+TASFb4Clo9fG5dop3U=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=AvdGZAdzNknktRsgicuZQqRwws2Ox78SGNKf7OXiEbzg612bv9s7ztPLEFLlK4uAx 05d6MPvGnpma5KKmn/PPgErk1migB9lzUVN5TfjbU8W3KL/dkKc/X0kRYXxekhPJgk UmPxldQNjkqPYb9tJSGzFqaejCuSE6QxIhO8Q5O5Mdaml/9sXX60eo2nw/mq7v56H8 v5bNqXL1N20a8GSU7jaUmtVhPdOeMLM4uDNZtm0AB+SAmpVXnHzUpk/r4GRDIuqOPc HA485ujkoXx/S3h07z5OEX4Q082Ew01i625+Wo3aZ+Oum9HKBRMTOza9/LbJYt/Xk+ CZeG0u6S4yxQA== Message-ID: <67c90fcd-df2f-40e4-9507-dcc9340f2319@kernel.org> Date: Fri, 19 Apr 2024 20:15:48 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 5/6] soc: qcom: add pd-mapper implementation To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Mathieu Poirier , Sibi Sankar , Bartosz Golaszewski , linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, Johan Hovold , Xilin Wu References: <20240419-qcom-pd-mapper-v5-0-e35b6f847e99@linaro.org> <20240419-qcom-pd-mapper-v5-5-e35b6f847e99@linaro.org> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 19/04/2024 20:10, Dmitry Baryshkov wrote: > On Fri, 19 Apr 2024 at 20:07, Krzysztof Kozlowski wrote: >> >> On 19/04/2024 16:00, Dmitry Baryshkov wrote: >>> Existing userspace protection domain mapper implementation has several >>> issue. It doesn't play well with CONFIG_EXTRA_FIRMWARE, it doesn't >>> reread JSON files if firmware location is changed (or if firmware was >>> not available at the time pd-mapper was started but the corresponding >>> directory is mounted later), etc. >>> >>> Provide in-kernel service implementing protection domain mapping >>> required to work with several services, which are provided by the DSP >>> firmware. >>> >> >> ... >> >>> + >>> +static const struct of_device_id qcom_pdm_domains[] = { >>> + { .compatible = "qcom,apq8096", .data = msm8996_domains, }, >>> + { .compatible = "qcom,msm8996", .data = msm8996_domains, }, >>> + { .compatible = "qcom,msm8998", .data = msm8998_domains, }, >>> + { .compatible = "qcom,qcm2290", .data = qcm2290_domains, }, >>> + { .compatible = "qcom,qcs404", .data = qcs404_domains, }, >>> + { .compatible = "qcom,sc7180", .data = sc7180_domains, }, >>> + { .compatible = "qcom,sc7280", .data = sc7280_domains, }, >>> + { .compatible = "qcom,sc8180x", .data = sc8180x_domains, }, >>> + { .compatible = "qcom,sc8280xp", .data = sc8280xp_domains, }, >>> + { .compatible = "qcom,sda660", .data = sdm660_domains, }, >>> + { .compatible = "qcom,sdm660", .data = sdm660_domains, }, >>> + { .compatible = "qcom,sdm670", .data = sdm670_domains, }, >>> + { .compatible = "qcom,sdm845", .data = sdm845_domains, }, >>> + { .compatible = "qcom,sm6115", .data = sm6115_domains, }, >>> + { .compatible = "qcom,sm6350", .data = sm6350_domains, }, >>> + { .compatible = "qcom,sm8150", .data = sm8150_domains, }, >>> + { .compatible = "qcom,sm8250", .data = sm8250_domains, }, >>> + { .compatible = "qcom,sm8350", .data = sm8350_domains, }, >>> + { .compatible = "qcom,sm8450", .data = sm8350_domains, }, >>> + { .compatible = "qcom,sm8550", .data = sm8550_domains, }, >>> + { .compatible = "qcom,sm8650", .data = sm8550_domains, }, >>> + {}, >>> +}; >> >> If this is supposed to be a module, then why no MODULE_DEVICE_TABLE? > > Ok, I should add this to the commit message. > > For now: > > This module is loaded automatically by the remoteproc drivers when Hm? How remoteproc loads this module? > necessary. It uses a root node to match a protection domains map for a > particular device. > >> >>> + >>> +static int qcom_pdm_start(void) >>> +{ >>> + const struct of_device_id *match; >>> + const struct qcom_pdm_domain_data * const *domains; >>> + struct device_node *root; >>> + int ret, i; >>> + >>> + pr_debug("PDM: starting service\n"); >> >> Drop simple entry/exit debug messages. > > ack > >> >>> + >>> + root = of_find_node_by_path("/"); >>> + if (!root) >>> + return -ENODEV; >>> + >>> + match = of_match_node(qcom_pdm_domains, root); >>> + of_node_put(root); >>> + if (!match) { >>> + pr_notice("PDM: no support for the platform, userspace daemon might be required.\n"); >>> + return 0; >>> + } >>> + >>> + domains = match->data; >> >> All this is odd a bit. Why is this not a driver? You are open coding >> here of_device_get_match_data(). > > Except that it matches the root node instead of matching a device. Yep, but if this was proper device then things get simpler, don't they? ... >>> + >>> + if (!ret) >>> + ++qcom_pdm_count; >>> + >>> + mutex_unlock(&qcom_pdm_mutex); >> >> Looks like you implement refcnt manually... > > Yes... There is refcount_dec_and_mutex_lock(), but I found no > corresponding refcount_add_and_mutex_lock(). Maybe I'm > misunderstanding that framework. > I need to have a mutex after incrementing the lock from 0, so that the > driver can init QMI handlers. > >> Also, what happens if this module gets unloaded? How do you handle >> module dependencies? I don't see any device links. Bartosz won't be >> happy... We really need to stop adding more of >> old-style-buggy-never-unload-logic. At least for new code. > > Module dependencies are handled by the symbol dependencies. You mean build dependencies, not runtime load. > Remoteproc module depends on this symbol. Once q6v5 remoteproc modules > are unloaded this module can be unloaded too. I am pretty sure you can unload this and get crashes. Best regards, Krzysztof