From patchwork Fri Mar 12 09:56:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399085 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 9EC93C43381 for ; Fri, 12 Mar 2021 09:58:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81B02651CA for ; Fri, 12 Mar 2021 09:58:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232939AbhCLJ5p (ORCPT ); Fri, 12 Mar 2021 04:57:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233366AbhCLJ5Y (ORCPT ); Fri, 12 Mar 2021 04:57:24 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25D27C061761 for ; Fri, 12 Mar 2021 01:57:24 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id u16so4452827wrt.1 for ; Fri, 12 Mar 2021 01:57:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=h87jccumC6oS/Oglf5H2ioMoJmQRJZD6wd7xhfpKIok=; b=k9uA7L8IBE1dLEjKA1rPfX2KHcldVoYzn2eOjFbWT8y0IRfeiEiAgKl9bFORFx31XJ nZoN752KT0y3/Ax7g9R3kTMvec5r3QQgdhrMbrs/G2OPqBncym7VnDxearbbafhpmEoJ oFE6pHOAaE93d/PsyW2nJNbZMJCw2dVSKyEJrZAjqtL6yAHrWrnWYcHTKzWeDoXsfX6L WP0n3QvhKi3yX27SWJHWWda3x+gxIWUNkC4NcOKdgSblO/Gn5bnWEvkChO6Ad+2wWAQc clVUU0t2p5IQlysAfWwthAM/ur8jBHgzGYAYXEsQv+mSc3DWrm2STj1EQJkNbCxnrV/O I+ZA== 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=h87jccumC6oS/Oglf5H2ioMoJmQRJZD6wd7xhfpKIok=; b=q2qp8wexp2K+IImjppEx0yy2jbcrKbfrK+wvoACG9ZnhV5MjqqStk9xdvwFZ7hG6Sj OnsGgdl7FzuKr7U4bD7YP1STciFsYuVDPfBUMZR2/QyWdU2ei+SpCLJK2DKN4d5FfVSU 53eD6hT7lslQiCw8QKlOevW1CSsSY2kM9fdsgjcJ2KZlMYiBRzIChsFCsaeLvT/lrh4m gHH406fW5WcQlHO8FLibUhQp1Ri8veyv/88ym5dPCHQvfrmVqPMHB9VfcGG1F3SH8N4T hAbhrXNHiojz03cLfwCYGScNzxQFMh3oeglHmIF9lpEtkM7ypdzA7kspOV6TQtHOgRcb Gh9A== X-Gm-Message-State: AOAM530DWUSzZMAdikch8cKpemR2PZePuGOg23B+N/n/p8GmYt67rZBl z2MrRllra0WVHlXsirqNlOPP0Q== X-Google-Smtp-Source: ABdhPJwc3AB9reyfjzyfl77Ve4iOdbEW9ZNUJg2hIrx1noYkusPdsU12AJQoBdNC2hp2UF1JDuQfbg== X-Received: by 2002:a5d:5141:: with SMTP id u1mr13198246wrt.31.1615543042886; Fri, 12 Mar 2021 01:57:22 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:22 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 01/11] configfs: increase the item name length Date: Fri, 12 Mar 2021 10:56:50 +0100 Message-Id: <20210312095700.16277-2-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski 20 characters limit for item name is relatively small. Let's increase it to 32 to fit '04-committable-children' - a name we'll use in the sample code for committable items. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- include/linux/configfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/configfs.h b/include/linux/configfs.h index 2e8c69b43c64..4f76dcc08134 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -27,7 +27,7 @@ #include /* struct kref */ #include /* struct mutex */ -#define CONFIGFS_ITEM_NAME_LEN 20 +#define CONFIGFS_ITEM_NAME_LEN 32 struct module; From patchwork Fri Mar 12 09:56:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399084 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 878ADC432C3 for ; Fri, 12 Mar 2021 09:58:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6482A6512C for ; Fri, 12 Mar 2021 09:58:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233355AbhCLJ5q (ORCPT ); Fri, 12 Mar 2021 04:57:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233368AbhCLJ5Z (ORCPT ); Fri, 12 Mar 2021 04:57:25 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25DCDC061762 for ; Fri, 12 Mar 2021 01:57:25 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id x13so1417779wrs.9 for ; Fri, 12 Mar 2021 01:57:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=k4SxFZ2/z04LDFxgHqyBoGQvdfw+6RqGbZM8dagLyJw=; b=NSFCrfknOrsPvrfuIpExT3BUcasO4VRkrBWbd+cmQWE3uVsiEEgDCT/IIg2YMnuKUJ PdHgGdscCIQkxCwS7SsvCflKdMJEuXNwhh4M7dYAXkRAGdCoRa+BPNI8KyiX3NpprHY6 Kbl4n7QCdi/ejWni8u1zMp7XbGV8U1PILI0RCkaxH6TBcqdQavk6Tzr3LRaWnMG3mo1H zJ6pGVM+pXs89M6lVZBQ+oGmav3BJ51mcnRcbPhM0T4vtDPm02JJLKuI9MOzHf/iIBZx tpUhAMJlSqNK/z9kVodpE8/Oug/WJ5AWXilO9FXR2AS/z5Bnl3LECUeM7PFYchh+o6mF nvfA== 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=k4SxFZ2/z04LDFxgHqyBoGQvdfw+6RqGbZM8dagLyJw=; b=tUhqwEbB/1HuhoM9Z31cPPGv+bNeCuc0uLpg7FnUqJrUnmoQ4gLzLSDYk3RBYfGSNl GzXx2V4wae69Mx2K/g/FtrDvsS/rwO5AK0fMQWA5AAFEWM+itxdGzDet6Imcmx97ADup KPlwWcIfk6klMjKBunLH5wUpMCAzX/pX19WqPAtExN672BJYIaiLHg2xy3SGE8hlbuMU +yu6IPMUwvF7PkcKT9nGDbm2W1mjYgXchWRA2udE3Ipc6c3TvnT62glbJnrDN1JzzEVE BF7HMuMmUkMQWQ4dS6WZJaOaJIN1vssylX0Rk7JMjYTIvCCAF7sxLVK576mwh8cj6Lgy PSxg== X-Gm-Message-State: AOAM530zeOmAaSSAPLS7YYLYMTDCvnrbCrPukliGnqlzBuL4V8eaKpZw hTtIVjcANaqpPUhvYJf+RPe+iQ== X-Google-Smtp-Source: ABdhPJyjBPFlgp5o53yubE8Q14+NsGqDJMmh9yVt4SWKqd7mJ4Oam8DVjEQDA9qo4HyU31R3LMcLDw== X-Received: by 2002:a5d:6a81:: with SMTP id s1mr13192011wru.401.1615543043886; Fri, 12 Mar 2021 01:57:23 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:23 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 02/11] configfs: use (1UL << bit) for internal flags Date: Fri, 12 Mar 2021 10:56:51 +0100 Message-Id: <20210312095700.16277-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski For better readability and maintenance: use the (1UL << bit) for flag definitions. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- fs/configfs/configfs_internal.h | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h index 9a3aed249692..b495c9f043d4 100644 --- a/fs/configfs/configfs_internal.h +++ b/fs/configfs/configfs_internal.h @@ -46,16 +46,16 @@ struct configfs_dirent { struct configfs_fragment *s_frag; }; -#define CONFIGFS_ROOT 0x0001 -#define CONFIGFS_DIR 0x0002 -#define CONFIGFS_ITEM_ATTR 0x0004 -#define CONFIGFS_ITEM_BIN_ATTR 0x0008 -#define CONFIGFS_ITEM_LINK 0x0020 -#define CONFIGFS_USET_DIR 0x0040 -#define CONFIGFS_USET_DEFAULT 0x0080 -#define CONFIGFS_USET_DROPPING 0x0100 -#define CONFIGFS_USET_IN_MKDIR 0x0200 -#define CONFIGFS_USET_CREATING 0x0400 +#define CONFIGFS_ROOT (1UL << 0) +#define CONFIGFS_DIR (1UL << 1) +#define CONFIGFS_ITEM_ATTR (1UL << 2) +#define CONFIGFS_ITEM_BIN_ATTR (1UL << 3) +#define CONFIGFS_ITEM_LINK (1UL << 5) +#define CONFIGFS_USET_DIR (1UL << 6) +#define CONFIGFS_USET_DEFAULT (1UL << 7) +#define CONFIGFS_USET_DROPPING (1UL << 8) +#define CONFIGFS_USET_IN_MKDIR (1UL << 9) +#define CONFIGFS_USET_CREATING (1UL << 10) #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR) extern struct mutex configfs_symlink_mutex; From patchwork Fri Mar 12 09:56:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399826 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 E0AA3C4332B for ; Fri, 12 Mar 2021 09:58:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC1D06508F for ; Fri, 12 Mar 2021 09:58:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233301AbhCLJ5q (ORCPT ); Fri, 12 Mar 2021 04:57:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233387AbhCLJ50 (ORCPT ); Fri, 12 Mar 2021 04:57:26 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F08CC061574 for ; Fri, 12 Mar 2021 01:57:26 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id j7so1417791wrd.1 for ; Fri, 12 Mar 2021 01:57:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=fUwsUBnwpUEeIgj3zKzPgEDR8ZuQ3xVAmh3ZPjlofqU=; b=Liu/YpfFs/GWGfmvJqPiOXQ3mc1ogRWY676dc5w4ybgdpsMo7h0EiSA8MvEN4xmKCg 1RP4XtMJZ7s31VCeb6Egj1l1KCFBMY2fiJ+QFpgbQ18DF/GPh7l+XmhLtrgckp/rA78C VZuZ3BmK8VwNYmCdFuppCJICsJUbfo7bUK22o8h6ieyMXbcZBCkp0kMS4EVIgux4EYrG RjZ3iz5+0+KjouWqC1cGnir3veAw1Nn5RwOL7OrrnWqEj4FJDZgsgmToLClRUEvLCXb7 McQN9NjWhkHgdr0yQpQhXZoTIY6ObHVeXCQDNaypxLfdGuFMy5ldelgjkbBJ/vUZ0SnD Atog== 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=fUwsUBnwpUEeIgj3zKzPgEDR8ZuQ3xVAmh3ZPjlofqU=; b=gXIMidT3w6eicJ5K1mzo0anQz/dpBKsMb4fJftnmsb+7QWKm2tQkHPFfJEiN7l5ou1 ECs3R4DoMH7blIuvjGSzDloo0hx67cgtpobHc8xT9hChoH83sqy3YAPNqEOywBXZZcn8 xIMQUucTpAUwz7NmOPAkoBvGxQzvo7Ly+I3ySADZBuZQWddhzSMwqu1rbV5pjsfbJPvN Fa4LznMJvjdkMXeZDOyR96HQfT9vUnw4b64UFlb/z42S6df9JOGcCMvlG3HVq7AnqXY/ u1IySDzBbwhcajAYPCEQF2UPTcVQHbKOIkh5xhj2XRatqHiAo+IxNZNhLaLZBa9BFmAL T+zA== X-Gm-Message-State: AOAM533DACSQRJtPR62AYfSWTe6Mt6sH+eHdyinm16j8Gv0Th1aOSPLy MO9hRm8jb7gZLrKAtcsshlj7J9AT2AkieQ== X-Google-Smtp-Source: ABdhPJzVuPuOv6zHnXhRl9riymEUMR0nIczF9PzHp+VaqEwAekqnTY8vbuL19t/wblKItQXbBWyNAw== X-Received: by 2002:a05:6000:124f:: with SMTP id j15mr13157494wrx.263.1615543044951; Fri, 12 Mar 2021 01:57:24 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:24 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 03/11] configfs: implement committable items Date: Fri, 12 Mar 2021 10:56:52 +0100 Message-Id: <20210312095700.16277-4-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski This implements configfs committable items. We mostly follow the documentation except that we extend config_group_ops with uncommit_item() callback for reverting the changes made by commit_item(). Each committable group has two sub-directories: pending and live. New items can only be created in pending/. Attributes can only be modified while the item is in pending/. Once it's ready to be committed, it must be moved over to live/ using the rename() system call. This is when the commit_item() function will be called. Implementation-wise: we reuse the default group mechanism to elegantly plug the new pseude-groups into configfs. The pending group inherits the parent group's operations so that config_items can be seamlesly created in it using the callbacks supplied by the user as part of the committable group itself. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- Documentation/filesystems/configfs.rst | 6 +- fs/configfs/configfs_internal.h | 2 + fs/configfs/dir.c | 245 ++++++++++++++++++++++++- include/linux/configfs.h | 1 + 4 files changed, 245 insertions(+), 9 deletions(-) diff --git a/Documentation/filesystems/configfs.rst b/Documentation/filesystems/configfs.rst index 1d3d6f4a82a9..7e0e7c356450 100644 --- a/Documentation/filesystems/configfs.rst +++ b/Documentation/filesystems/configfs.rst @@ -290,6 +290,7 @@ config_item_type:: struct config_group *(*make_group)(struct config_group *group, const char *name); int (*commit_item)(struct config_item *item); + int (*uncommit_item)(struct config_item *item); void (*disconnect_notify)(struct config_group *group, struct config_item *item); void (*drop_item)(struct config_group *group, @@ -490,9 +491,6 @@ pass up an error. Committable Items ================= -Note: - Committable items are currently unimplemented. - Some config_items cannot have a valid initial state. That is, no default values can be specified for the item's attributes such that the item can do its work. Userspace must configure one or more attributes, @@ -532,4 +530,4 @@ method returns zero and the item is moved to the "live" directory. As rmdir(2) does not work in the "live" directory, an item must be shutdown, or "uncommitted". Again, this is done via rename(2), this time from the "live" directory back to the "pending" one. The subsystem -is notified by the ct_group_ops->uncommit_object() method. +is notified by the ct_group_ops->uncommit_item() method. diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h index b495c9f043d4..41ac21c82bf5 100644 --- a/fs/configfs/configfs_internal.h +++ b/fs/configfs/configfs_internal.h @@ -56,6 +56,8 @@ struct configfs_dirent { #define CONFIGFS_USET_DROPPING (1UL << 8) #define CONFIGFS_USET_IN_MKDIR (1UL << 9) #define CONFIGFS_USET_CREATING (1UL << 10) +#define CONFIGFS_GROUP_PENDING (1UL << 11) +#define CONFIGFS_GROUP_LIVE (1UL << 12) #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR) extern struct mutex configfs_symlink_mutex; diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index b6098e02e20b..f3c95c1d5278 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -656,6 +656,13 @@ static void detach_groups(struct config_group *group) inode_unlock(d_inode(child)); + /* + * Free memory allocated for the pending and live directories + * of committable groups. + */ + if (sd->s_type & (CONFIGFS_GROUP_PENDING | CONFIGFS_GROUP_LIVE)) + kfree(sd->s_element); + d_delete(child); dput(child); } @@ -860,6 +867,134 @@ static void configfs_detach_item(struct config_item *item) configfs_remove_dir(item); } +static bool is_committable_group(struct config_item *item) +{ + const struct config_item_type *type = item->ci_type; + + if (type && type->ct_group_ops && + type->ct_group_ops->commit_item && + type->ct_group_ops->uncommit_item) + return true; + + return false; +} + +struct pending_group_data { + struct config_group group; + struct config_item_type type; + struct configfs_group_operations group_ops; +}; + +struct live_group_data { + struct config_group group; + struct config_item_type type; +}; + +static int create_pending_group(struct config_item *parent_item, + struct configfs_fragment *frag) +{ + const struct config_item_type *parent_type = parent_item->ci_type; + struct pending_group_data *pending; + struct configfs_dirent *sd; + int ret; + + pending = kzalloc(sizeof(*pending), GFP_KERNEL); + if (!pending) + return -ENOMEM; + + /* + * Let's inherit the group_ops from the parent except for item + * committing and uncommitting. + */ + memcpy(&pending->group_ops, parent_type->ct_group_ops, + sizeof(struct configfs_group_operations)); + pending->type.ct_group_ops = &pending->group_ops; + pending->type.ct_group_ops->commit_item = NULL; + pending->type.ct_group_ops->uncommit_item = NULL; + + /* Let's directly reuse item_ops. */ + pending->type.ct_item_ops = parent_type->ct_item_ops; + pending->type.ct_owner = parent_type->ct_owner; + + config_group_init_type_name(&pending->group, "pending", &pending->type); + + ret = create_default_group(to_config_group(parent_item), + &pending->group, frag); + if (ret) { + kfree(pending); + return ret; + } + + link_group(to_config_group(parent_item), &pending->group); + + sd = pending->group.cg_item.ci_dentry->d_fsdata; + /* Allow creating config_items in 'pending' group. */ + sd->s_type |= (CONFIGFS_GROUP_PENDING | CONFIGFS_USET_DIR); + + return 0; +} + +static int create_live_group(struct config_item *parent_item, + struct configfs_fragment *frag) +{ + struct live_group_data *live; + struct configfs_dirent *sd; + int ret; + + live = kzalloc(sizeof(*live), GFP_KERNEL); + if (!live) + return -ENOMEM; + + live->type.ct_owner = parent_item->ci_type->ct_owner; + + config_group_init_type_name(&live->group, "live", &live->type); + + ret = create_default_group(to_config_group(parent_item), + &live->group, frag); + if (ret) { + kfree(live); + return ret; + } + + link_group(to_config_group(parent_item), &live->group); + + sd = live->group.cg_item.ci_dentry->d_fsdata; + sd->s_type |= CONFIGFS_GROUP_LIVE; + sd->s_type &= ~CONFIGFS_USET_DIR; + + return 0; +} + +static int create_committable_groups(struct config_item *parent_item, + struct configfs_fragment *frag) +{ + struct configfs_dirent *sd; + int ret; + + ret = create_pending_group(parent_item, frag); + if (ret) + return ret; + + ret = create_live_group(parent_item, frag); + if (ret) { + detach_groups(to_config_group(parent_item)); + return ret; + } + + /* Disallow creating items directly in the committable group. */ + sd = parent_item->ci_dentry->d_fsdata; + sd->s_type &= ~CONFIGFS_USET_DIR; + + return 0; +} + +static void dentry_mark_dead(struct config_item *item, struct dentry *dentry) +{ + configfs_detach_item(item); + d_inode(dentry)->i_flags |= S_DEAD; + dont_mount(dentry); +} + static int configfs_attach_group(struct config_item *parent_item, struct config_item *item, struct dentry *dentry, @@ -885,11 +1020,15 @@ static int configfs_attach_group(struct config_item *parent_item, inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); configfs_adjust_dir_dirent_depth_before_populate(sd); ret = populate_groups(to_config_group(item), frag); - if (ret) { - configfs_detach_item(item); - d_inode(dentry)->i_flags |= S_DEAD; - dont_mount(dentry); + if (ret) + dentry_mark_dead(item, dentry); + + if (is_committable_group(item)) { + ret = create_committable_groups(item, frag); + if (ret) + dentry_mark_dead(item, dentry); } + configfs_adjust_dir_dirent_depth_after_populate(sd); inode_unlock(d_inode(dentry)); if (ret) @@ -966,6 +1105,8 @@ static void configfs_dump_one(struct configfs_dirent *sd, int level) type_print(CONFIGFS_USET_DIR); type_print(CONFIGFS_USET_DEFAULT); type_print(CONFIGFS_USET_DROPPING); + type_print(CONFIGFS_GROUP_PENDING); + type_print(CONFIGFS_GROUP_LIVE); #undef type_print } @@ -1457,7 +1598,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) struct config_item *parent_item; struct config_item *item; struct configfs_subsystem *subsys; - struct configfs_dirent *sd; + struct configfs_dirent *sd, *parent_sd; struct configfs_fragment *frag; struct module *subsys_owner = NULL, *dead_item_owner = NULL; int ret; @@ -1476,6 +1617,12 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) return -EINVAL; } + parent_sd = dentry->d_parent->d_fsdata; + if (parent_sd->s_type & CONFIGFS_GROUP_LIVE) { + config_item_put(parent_item); + return -EPERM; + } + /* configfs_mkdir() shouldn't have allowed this */ BUG_ON(!subsys->su_group.cg_item.ci_type); subsys_owner = subsys->su_group.cg_item.ci_type->ct_owner; @@ -1562,9 +1709,97 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) return 0; } +static int configfs_rename(struct user_namespace *mnt_userns, + struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) +{ + struct configfs_dirent *sd, *old_parent_sd, *new_parent_sd; + struct dentry *old_parent_dentry, *new_parent_dentry; + struct dentry *committable_group_dentry; + struct config_item *committable_group_item, *item, *new_parent_item; + struct configfs_subsystem *committable_group_subsys; + struct configfs_group_operations *committable_group_ops; + int ret = 0; + + if (flags) + return -EINVAL; + + old_parent_dentry = old_dentry->d_parent; + new_parent_dentry = new_dentry->d_parent; + + sd = old_dentry->d_fsdata; + old_parent_sd = old_dentry->d_parent->d_fsdata; + new_parent_sd = new_dentry->d_parent->d_fsdata; + + if (!old_parent_sd || !new_parent_sd) + return -EPERM; + + /* + * Renaming must always be between a 'pending' and a 'live' group and + * both need to have the same parent. Changing the directory name is + * not allowed. + */ + if (!((old_parent_sd->s_type & CONFIGFS_GROUP_PENDING) && + (new_parent_sd->s_type & CONFIGFS_GROUP_LIVE)) && + !((old_parent_sd->s_type & CONFIGFS_GROUP_LIVE) && + (new_parent_sd->s_type & CONFIGFS_GROUP_PENDING))) + return -EPERM; + + if (old_parent_dentry->d_parent != new_parent_dentry->d_parent) + return -EPERM; + + if (strcmp(old_dentry->d_name.name, new_dentry->d_name.name)) + return -EPERM; + + committable_group_dentry = old_parent_dentry->d_parent; + /* + * Grab a reference to the committable group for the duration of + * this function. + */ + committable_group_item = + configfs_get_config_item(committable_group_dentry); + committable_group_subsys = + to_config_group(committable_group_item)->cg_subsys; + committable_group_ops = committable_group_item->ci_type->ct_group_ops; + + item = sd->s_element; + new_parent_item = new_parent_sd->s_element; + + if (WARN_ON(!is_committable_group(committable_group_item))) { + /* This would be a result of a programming error in configfs. */ + config_item_put(committable_group_item); + return -EPERM; + } + + mutex_lock(&committable_group_subsys->su_mutex); + + if ((old_parent_sd->s_type & CONFIGFS_GROUP_PENDING) && + (new_parent_sd->s_type & CONFIGFS_GROUP_LIVE)) + ret = committable_group_ops->commit_item(item); + else + ret = committable_group_ops->uncommit_item(item); + if (ret) + goto out; + + spin_lock(&configfs_dirent_lock); + new_dentry->d_fsdata = sd; + list_move(&sd->s_sibling, &new_parent_sd->s_children); + item->ci_parent = new_parent_item; + d_move(old_dentry, new_dentry); + spin_unlock(&configfs_dirent_lock); + +out: + mutex_unlock(&committable_group_subsys->su_mutex); + config_item_put(committable_group_item); + + return ret; +} + const struct inode_operations configfs_dir_inode_operations = { .mkdir = configfs_mkdir, .rmdir = configfs_rmdir, + .rename = configfs_rename, .symlink = configfs_symlink, .unlink = configfs_unlink, .lookup = configfs_lookup, diff --git a/include/linux/configfs.h b/include/linux/configfs.h index 4f76dcc08134..ff6b0e408136 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -219,6 +219,7 @@ struct configfs_group_operations { struct config_item *(*make_item)(struct config_group *group, const char *name); struct config_group *(*make_group)(struct config_group *group, const char *name); int (*commit_item)(struct config_item *item); + int (*uncommit_item)(struct config_item *item); void (*disconnect_notify)(struct config_group *group, struct config_item *item); void (*drop_item)(struct config_group *group, struct config_item *item); }; From patchwork Fri Mar 12 09:56:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399083 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 1048FC43332 for ; 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[90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:25 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 04/11] samples: configfs: add a committable group Date: Fri, 12 Mar 2021 10:56:53 +0100 Message-Id: <20210312095700.16277-5-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Add an example of using committable items to configfs samples. Each config item has two attributes: read-write 'storeme' which works similarly to other examples in this file and a read-only 'committed' attribute which changes its value between false and true depending on whether it's committed or not at the moment. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij --- samples/configfs/configfs_sample.c | 153 +++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) diff --git a/samples/configfs/configfs_sample.c b/samples/configfs/configfs_sample.c index f9008be7a8a1..9bef74e4369d 100644 --- a/samples/configfs/configfs_sample.c +++ b/samples/configfs/configfs_sample.c @@ -315,6 +315,158 @@ static struct configfs_subsystem group_children_subsys = { /* ----------------------------------------------------------------- */ +/* + * 04-committable-children + * + * This is an example of a committable group. It's similar to the simple + * children example but each config_item has an additional 'committed' + * attribute which is read-only and is only modified when the config_item + * is moved from the 'pending' to the 'live' directory. + */ + +struct committable_child { + struct config_item item; + int storeme; + bool committed; +}; + +static inline struct committable_child * +to_committable_child(struct config_item *item) +{ + return container_of(item, struct committable_child, item); +} + +static ssize_t +committable_child_storeme_show(struct config_item *item, char *page) +{ + return sprintf(page, "%d\n", to_committable_child(item)->storeme); +} + +static ssize_t committable_child_storeme_store(struct config_item *item, + const char *page, size_t count) +{ + struct committable_child *child = to_committable_child(item); + int ret; + + if (child->committed) + return -EPERM; + + ret = kstrtoint(page, 10, &child->storeme); + if (ret) + return ret; + + return count; +} + +CONFIGFS_ATTR(committable_child_, storeme); + +static ssize_t +committable_child_committed_show(struct config_item *item, char *page) +{ + return sprintf(page, "%s\n", + to_committable_child(item)->committed ? "true" : "false"); +} + +CONFIGFS_ATTR_RO(committable_child_, committed); + +static struct configfs_attribute *committable_child_attrs[] = { + &committable_child_attr_storeme, + &committable_child_attr_committed, + NULL, +}; + +static void committable_child_release(struct config_item *item) +{ + kfree(to_committable_child(item)); +} + +static struct configfs_item_operations committable_child_item_ops = { + .release = committable_child_release, +}; + +static const struct config_item_type committable_child_type = { + .ct_item_ops = &committable_child_item_ops, + .ct_attrs = committable_child_attrs, + .ct_owner = THIS_MODULE, +}; + +struct committable_children { + struct config_group group; +}; + +static struct config_item * +committable_children_make_item(struct config_group *group, const char *name) +{ + struct committable_child *child; + + child = kzalloc(sizeof(*child), GFP_KERNEL); + if (!child) + return ERR_PTR(-ENOMEM); + + config_item_init_type_name(&child->item, name, &committable_child_type); + + return &child->item; +} + +static ssize_t +committable_children_description_show(struct config_item *item, char *page) +{ + return sprintf(page, +"[04-committable-children]\n" +"\n" +"This subsystem allows creation of committable config_items. The subsystem\n" +"has two subdirectories: pending and live. New config_items can only be\n" +"created in pending/ and they have one writable and readable attribute as\n" +"well as a single read-only attribute. The latter is only changed once the\n" +"item is 'committed'. This is done by moving the config_item (using\n" +"rename()) to the live/ directory. In this example, the storeme attribute\n" +"becomes 'read-only' once committed.\n"); +} + +CONFIGFS_ATTR_RO(committable_children_, description); + +static struct configfs_attribute *committable_children_attrs[] = { + &committable_children_attr_description, + NULL, +}; + +static int committable_children_commit_item(struct config_item *item) +{ + to_committable_child(item)->committed = true; + + return 0; +} + +static int committable_children_uncommit_item(struct config_item *item) +{ + to_committable_child(item)->committed = false; + + return 0; +} + +static struct configfs_group_operations committable_children_group_ops = { + .make_item = committable_children_make_item, + .commit_item = committable_children_commit_item, + .uncommit_item = committable_children_uncommit_item, +}; + +static const struct config_item_type committable_children_type = { + .ct_group_ops = &committable_children_group_ops, + .ct_attrs = committable_children_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem committable_children_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "04-committable-children", + .ci_type = &committable_children_type, + }, + }, +}; + +/* ----------------------------------------------------------------- */ + /* * We're now done with our subsystem definitions. * For convenience in this module, here's a list of them all. It @@ -326,6 +478,7 @@ static struct configfs_subsystem *example_subsys[] = { &childless_subsys.subsys, &simple_children_subsys, &group_children_subsys, + &committable_children_subsys, NULL, }; From patchwork Fri Mar 12 09:56:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399822 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 7883BC4361B for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 506FF6508F for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233384AbhCLJ5s (ORCPT ); Fri, 12 Mar 2021 04:57:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233471AbhCLJ52 (ORCPT ); Fri, 12 Mar 2021 04:57:28 -0500 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3270EC061761 for ; Fri, 12 Mar 2021 01:57:28 -0800 (PST) Received: by mail-wr1-x434.google.com with SMTP id x16so1421904wrn.4 for ; Fri, 12 Mar 2021 01:57:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=YQC6wFy2J65Y28BJx46C1FfvB3e/Gw51qsSfNp1Q/wg=; b=xhxUA7+WYoiDuZ/QtV3NygWcjE5AdLlO5qB9+Qo4uEQHulumk7GQTGyZxeyasoe0ea w3NwNxHzvNaUSHGqOQcsjJL/+WWiw97WVwpdO7CcUhxjSd9bU72nJw8OolxG7a8A4wHF P9zXUwQ+Wq+puYoJcP2czS1jJNqQvRtBGyFZ/Z68F0qqtfUQ5zEDIYELaV9YUct6zYsg zcVZ3Ahkp/hWyBbrSuwdmg6jIZSmpP5WntcMujve57XNrFg6fWpJHXaPX5pm29w42hT5 1IzaxLuw4XH0rcxQbgGMNRO8aKbSTKloJvq9d7LAZNzOfPayRZod/WGiGuSDDrDx5FKO owNw== 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=YQC6wFy2J65Y28BJx46C1FfvB3e/Gw51qsSfNp1Q/wg=; b=V+xzwl46J1O6zq2pyjXtcsXzDH22aGQVJ3CcChr8NmGxwRqEe19BBCgFsOqF8lOFZn fiLkID0JOq/n9E4lj8c329WGcqeodLgo/eQZwPgveStUyduEmm+2P6UH/n8bkRsRMxcI ABL65tdfS9Hx1W3WFXXsSzL2OhLkL/HEGa6Vp+r2SKmWMj3MV08SdMlNaoZ6IiCajoCb aNHuCi89tStLvWk2427cTaiXVIDoehIy6uHZZTtx9mUlNMJYA9YivqlGD2nKKsmCNa5b dTS/R9q+spGX8b2rVPkHag2riWCoI0DHf/8zYGYjiptwwkRC/QDiyFXUnDvS32UynnDL pXIA== X-Gm-Message-State: AOAM531BpvDCQU1Yq2xuqsGrKLhaAoKqZ+deWC+CN3w36WC392IiqTHS vZNjc8TA0D+L4CiE51jZnN5hOA== X-Google-Smtp-Source: ABdhPJzjYlutpfhjnWI4uL6g9A4wK/mVdnRfrd++5vVpecsLHGfuQJ5GTJzCn5RXj5PrVCp0hMfnrw== X-Received: by 2002:a5d:6a87:: with SMTP id s7mr13119509wru.312.1615543046893; Fri, 12 Mar 2021 01:57:26 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:26 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 05/11] lib: bitmap: remove the 'extern' keyword from function declarations Date: Fri, 12 Mar 2021 10:56:54 +0100 Message-Id: <20210312095700.16277-6-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski The 'extern' keyword doesn't have any benefits in header files. Remove it. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko --- include/linux/bitmap.h | 115 ++++++++++++++++++++--------------------- 1 file changed, 57 insertions(+), 58 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 70a932470b2d..6939a8983026 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -118,54 +118,53 @@ * Allocation and deallocation of bitmap. * Provided in lib/bitmap.c to avoid circular dependency. */ -extern unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); -extern unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); -extern void bitmap_free(const unsigned long *bitmap); +unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); +unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); +void bitmap_free(const unsigned long *bitmap); /* * lib/bitmap.c provides these functions: */ -extern int __bitmap_equal(const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern bool __pure __bitmap_or_equal(const unsigned long *src1, - const unsigned long *src2, - const unsigned long *src3, - unsigned int nbits); -extern void __bitmap_complement(unsigned long *dst, const unsigned long *src, - unsigned int nbits); -extern void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, - unsigned int shift, unsigned int nbits); -extern void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, - unsigned int shift, unsigned int nbits); -extern void bitmap_cut(unsigned long *dst, const unsigned long *src, - unsigned int first, unsigned int cut, - unsigned int nbits); -extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, +int __bitmap_equal(const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +bool __pure __bitmap_or_equal(const unsigned long *src1, + const unsigned long *src2, + const unsigned long *src3, + unsigned int nbits); +void __bitmap_complement(unsigned long *dst, const unsigned long *src, + unsigned int nbits); +void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, + unsigned int shift, unsigned int nbits); +void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, + unsigned int shift, unsigned int nbits); +void bitmap_cut(unsigned long *dst, const unsigned long *src, + unsigned int first, unsigned int cut, unsigned int nbits); +int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +void __bitmap_replace(unsigned long *dst, + const unsigned long *old, const unsigned long *new, + const unsigned long *mask, unsigned int nbits); +int __bitmap_intersects(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int nbits); -extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern void __bitmap_replace(unsigned long *dst, - const unsigned long *old, const unsigned long *new, - const unsigned long *mask, unsigned int nbits); -extern int __bitmap_intersects(const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern int __bitmap_subset(const unsigned long *bitmap1, - const unsigned long *bitmap2, unsigned int nbits); -extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); -extern void __bitmap_set(unsigned long *map, unsigned int start, int len); -extern void __bitmap_clear(unsigned long *map, unsigned int start, int len); - -extern unsigned long bitmap_find_next_zero_area_off(unsigned long *map, - unsigned long size, - unsigned long start, - unsigned int nr, - unsigned long align_mask, - unsigned long align_offset); +int __bitmap_subset(const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int nbits); +int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); +void __bitmap_set(unsigned long *map, unsigned int start, int len); +void __bitmap_clear(unsigned long *map, unsigned int start, int len); + +unsigned long bitmap_find_next_zero_area_off(unsigned long *map, + unsigned long size, + unsigned long start, + unsigned int nr, + unsigned long align_mask, + unsigned long align_offset); /** * bitmap_find_next_zero_area - find a contiguous aligned zero area @@ -190,33 +189,33 @@ bitmap_find_next_zero_area(unsigned long *map, align_mask, 0); } -extern int bitmap_parse(const char *buf, unsigned int buflen, +int bitmap_parse(const char *buf, unsigned int buflen, unsigned long *dst, int nbits); -extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen, +int bitmap_parse_user(const char __user *ubuf, unsigned int ulen, unsigned long *dst, int nbits); -extern int bitmap_parselist(const char *buf, unsigned long *maskp, +int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits); -extern int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen, +int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen, unsigned long *dst, int nbits); -extern void bitmap_remap(unsigned long *dst, const unsigned long *src, +void bitmap_remap(unsigned long *dst, const unsigned long *src, const unsigned long *old, const unsigned long *new, unsigned int nbits); -extern int bitmap_bitremap(int oldbit, +int bitmap_bitremap(int oldbit, const unsigned long *old, const unsigned long *new, int bits); -extern void bitmap_onto(unsigned long *dst, const unsigned long *orig, +void bitmap_onto(unsigned long *dst, const unsigned long *orig, const unsigned long *relmap, unsigned int bits); -extern void bitmap_fold(unsigned long *dst, const unsigned long *orig, +void bitmap_fold(unsigned long *dst, const unsigned long *orig, unsigned int sz, unsigned int nbits); -extern int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order); -extern void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order); -extern int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order); +int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order); +void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order); +int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order); #ifdef __BIG_ENDIAN -extern void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits); +void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits); #else #define bitmap_copy_le bitmap_copy #endif -extern unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits); -extern int bitmap_print_to_pagebuf(bool list, char *buf, +unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits); +int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, int nmaskbits); #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) @@ -265,9 +264,9 @@ static inline void bitmap_copy_clear_tail(unsigned long *dst, * therefore conversion is not needed when copying data from/to arrays of u32. */ #if BITS_PER_LONG == 64 -extern void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, +void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, unsigned int nbits); -extern void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, +void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, unsigned int nbits); #else #define bitmap_from_arr32(bitmap, buf, nbits) \ From patchwork Fri Mar 12 09:56:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399825 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 20300C4360C for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF8A165171 for ; 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[90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:27 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 06/11] lib: bitmap: order includes alphabetically Date: Fri, 12 Mar 2021 10:56:55 +0100 Message-Id: <20210312095700.16277-7-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski For better readability and maintenance: order the includes in bitmap source files alphabetically. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko --- include/linux/bitmap.h | 4 ++-- lib/bitmap.c | 9 +++++---- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 6939a8983026..3282db97e06c 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -4,10 +4,10 @@ #ifndef __ASSEMBLY__ -#include #include -#include #include +#include +#include /* * bitmaps provide bit arrays that consume one or more unsigned diff --git a/lib/bitmap.c b/lib/bitmap.c index 75006c4036e9..78f70d9007ad 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -3,17 +3,18 @@ * lib/bitmap.c * Helper functions for bitmap.h. */ -#include -#include -#include -#include + #include #include #include +#include +#include +#include #include #include #include #include +#include #include #include From patchwork Fri Mar 12 09:56:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399824 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 0BED0C433DB for ; Fri, 12 Mar 2021 09:58:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D53FC6512C for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233357AbhCLJ5t (ORCPT ); Fri, 12 Mar 2021 04:57:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233517AbhCLJ5a (ORCPT ); Fri, 12 Mar 2021 04:57:30 -0500 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 22849C061574 for ; Fri, 12 Mar 2021 01:57:30 -0800 (PST) Received: by mail-wm1-x32a.google.com with SMTP id n11-20020a05600c4f8bb029010e5cf86347so4249192wmq.1 for ; Fri, 12 Mar 2021 01:57:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=b9JrBKuO/UMxqLp0dR5QODxDjy8Sowg28gDkd3Cd158=; b=bHHoNDW3JRGsD6bPfO5HboJCO/DehCeddkWOaLZ9vSGTsmAg0oVXJ9+gQtURgmNP7I n++im+iQ6YWB0vmkGEf745KDWKRrqSgfZ2KLo90Sh6oTjTmK/FFUc+zLbD2hJagMHfS0 mMqCprQNRAx3IcXo4YFwXB9+6XguRg+BvDxD9hPgPIsoufWytlSgkWOHa0/8bkC+kjJl PtbolL+SFbeuNgQAyzAQzkjF+Sp1aIj+DI9sOurvCX/BcpHVPPvWX8OfIwtrzFurZ8cF 9Fiw+P72fYeXix3mf/tpg0ZllBC6xQjA4ZKLcB/oOgpcgqGNFMR/HYzhe0B77++Qg/dA RiUw== 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=b9JrBKuO/UMxqLp0dR5QODxDjy8Sowg28gDkd3Cd158=; b=hJK7q8NA63JsE4Bf5PTt5BC6807YaOQdQC/x4Dn35eFTSXe+lyEGaLTtiGfBdrM7Pg OFz64ekxDZ/Rji6zf3nkZoY6IYO5G01CxNEUsYascbAer8P+gQYyaEWH1iA2OPr4Qe9R am88ldwXfBkETUkNy2jhp12mIw6u3XxXs4BJFa+fj3F4lQzuUQ5wuGYRLLmiybKJU3Fr +Fv8WR2gJyLT3nQRVlgjIRUG/8ROxy6Z8sc9huIWNMvLc/zCzlxPaT4ku5ifjqcpmyzn OQ4xD0AOYakYWNPmKVvkj3AKXyzewRF6T4J2/air3U4TkXSvNDAz/fwgfGpiZo7sUbHa wxwQ== X-Gm-Message-State: AOAM533jjP4RE3k3AG/O10T6Hqc2L8O+cXQ+UK9unokIFTKGdrZmUaEA NZnPBTeh8NBu4+RyupqR3oZbeg== X-Google-Smtp-Source: ABdhPJz/VCNVA1h2Dh1IIDQLX4482piL9UIP1+SIueczxwwCxKy9iyV8C1qVEFLMrj0+PNukBJKO2g== X-Received: by 2002:a1c:1f04:: with SMTP id f4mr12505897wmf.12.1615543048903; Fri, 12 Mar 2021 01:57:28 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:28 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 07/11] lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap_zalloc() Date: Fri, 12 Mar 2021 10:56:56 +0100 Message-Id: <20210312095700.16277-8-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Provide managed variants of bitmap_alloc() and bitmap_zalloc(). Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko --- include/linux/bitmap.h | 8 ++++++++ lib/bitmap.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 3282db97e06c..73d039476fa4 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -9,6 +9,8 @@ #include #include +struct device; + /* * bitmaps provide bit arrays that consume one or more unsigned * longs. The bitmap interface and available operations are listed @@ -122,6 +124,12 @@ unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); void bitmap_free(const unsigned long *bitmap); +/* Managed variants of the above. */ +unsigned long *devm_bitmap_alloc(struct device *dev, + unsigned int nbits, gfp_t flags); +unsigned long *devm_bitmap_zalloc(struct device *dev, + unsigned int nbits, gfp_t flags); + /* * lib/bitmap.c provides these functions: */ diff --git a/lib/bitmap.c b/lib/bitmap.c index 78f70d9007ad..b4fd7fd084c6 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -1263,6 +1264,38 @@ void bitmap_free(const unsigned long *bitmap) } EXPORT_SYMBOL(bitmap_free); +static void devm_bitmap_free(void *data) +{ + unsigned long *bitmap = data; + + bitmap_free(bitmap); +} + +unsigned long *devm_bitmap_alloc(struct device *dev, + unsigned int nbits, gfp_t flags) +{ + unsigned long *bitmap; + int ret; + + bitmap = bitmap_alloc(nbits, flags); + if (!bitmap) + return NULL; + + ret = devm_add_action_or_reset(dev, devm_bitmap_free, bitmap); + if (ret) + return NULL; + + return bitmap; +} +EXPORT_SYMBOL(devm_bitmap_alloc); + +unsigned long *devm_bitmap_zalloc(struct device *dev, + unsigned int nbits, gfp_t flags) +{ + return devm_bitmap_alloc(dev, nbits, flags | __GFP_ZERO); +} +EXPORT_SYMBOL(devm_bitmap_zalloc); + #if BITS_PER_LONG == 64 /** * bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap From patchwork Fri Mar 12 09:56:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399823 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 C1DA9C4160E for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8EE0D65117 for ; Fri, 12 Mar 2021 09:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233519AbhCLJ5t (ORCPT ); Fri, 12 Mar 2021 04:57:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56612 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233522AbhCLJ5c (ORCPT ); Fri, 12 Mar 2021 04:57:32 -0500 Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C4D8C061574 for ; Fri, 12 Mar 2021 01:57:31 -0800 (PST) Received: by mail-wm1-x32b.google.com with SMTP id r15-20020a05600c35cfb029010e639ca09eso15412976wmq.1 for ; Fri, 12 Mar 2021 01:57:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZeE4lVkcGsYHPEnEzaW8MdliPbcWmxrCG3NxJR/tNyE=; b=rjmIqo/vxferyuormyoYLpfWpPNLDoFHOy/rObP+EQxWxFFgpRmGIFVKPoz7ovPtj1 Cb0QN7q1zzeAM5CAuCTRGZybZyNwa08zwJDL5ERP9gGdn/APirkY/+yQwaACLDVX9yhW hnDvfq88twNtK7h3Qezm7Il8FFJ5Vtc0cHYXOFU4JBl/++faRf5BIg7AmYqsWvkO8s9g xu7fKb/oXe5idh6cjjoSN9jSjkDhtOUkV0IIDGWnTShFCtWLdiRlL0zoB7Pa9Edxou/G eAkR3i9t6R7SEboDFc/8tu/APaREHmDF/GojtwVAPjwOy5wfGZ+Y6on5HL+pkgfWK44O tnRg== 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=ZeE4lVkcGsYHPEnEzaW8MdliPbcWmxrCG3NxJR/tNyE=; b=DOlZfRQBxKbn2ZWNaWKXsfF4M3O8xsUFDSxKfRHdJBtm41Mf03OIP9pcwIJKVl0MxU 4u9BdgGL9cBQMjo90jobqHF091you4rAcLMSq76pwAf+i2wKFIwb+Hl2z9i5V6pV48JJ QvKLs+W+sASeRyEQ9lblgB6SnHL1OTD1qOKUYBEVyznKlXQDlx+xLhFJkAOMNhBD52nx oPIRPDSWWYX+R8KhIEhpBfp0PmVAPXFCgdX6FouJeIrN7qdPGX1RLeTtK5DOG87jwDC1 EfoRlBsrENXgJnvUzjStQer/cIndsBCFRWIZ+FRsollbDhXwBiGfq6eEPNL0IZmOg1oG +wyw== X-Gm-Message-State: AOAM533jQ/rVo0PsJOGohUEnZKvNlI4CbV+RcMxnsUoreF+CpnIlaewc O5o8jXAskCGq2t4AaRaOtX6Q1Q== X-Google-Smtp-Source: ABdhPJwy6wrDaEhjRof85Z9kNWTAdzzNUsNnbnCxMLGZ3ssToGiIZEia0RySTBbOvSiW33R+EITl3w== X-Received: by 2002:a1c:22c2:: with SMTP id i185mr12220432wmi.99.1615543050073; Fri, 12 Mar 2021 01:57:30 -0800 (PST) Received: from debian-brgl.home (amarseille-656-1-4-167.w90-8.abo.wanadoo.fr. [90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:29 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 08/11] gpio: sim: new testing module Date: Fri, 12 Mar 2021 10:56:57 +0100 Message-Id: <20210312095700.16277-9-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Implement a new, modern GPIO testing module controlled by configfs attributes instead of module parameters. The goal of this driver is to provide a replacement for gpio-mockup that will be easily extensible with new features and doesn't require reloading the module to change the setup. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko Reviewed-by: Linus Walleij --- Documentation/admin-guide/gpio/gpio-sim.rst | 72 ++ drivers/gpio/Kconfig | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sim.c | 874 ++++++++++++++++++++ 4 files changed, 955 insertions(+) create mode 100644 Documentation/admin-guide/gpio/gpio-sim.rst create mode 100644 drivers/gpio/gpio-sim.c diff --git a/Documentation/admin-guide/gpio/gpio-sim.rst b/Documentation/admin-guide/gpio/gpio-sim.rst new file mode 100644 index 000000000000..08eac487e35e --- /dev/null +++ b/Documentation/admin-guide/gpio/gpio-sim.rst @@ -0,0 +1,72 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Configfs GPIO Simulator +======================= + +The configfs GPIO Simulator (gpio-sim) provides a way to create simulated GPIO +chips for testing purposes. The lines exposed by these chips can be accessed +using the standard GPIO character device interface as well as manipulated +using sysfs attributes. + +Creating simulated chips +------------------------ + +The gpio-sim module registers a configfs subsystem called 'gpio-sim'. It's a +subsystem with committable items which means two subdirectories are created in +the filesystem: pending and live. For more information on configfs and +committable items, please refer to Documentation/filesystems/configfs.rst. + +In order to instantiate a new simulated chip, the user needs to mkdir() a new +directory in pending/. Inside each new directory, there's a set of attributes +that can be used to configure the new chip. Once the configuration is complete, +the user needs to use rename() to move the chip to the live/ directory. This +creates and registers the new device. + +In order to destroy a simulated chip, it has to be moved back to pending first +and then removed using rmdir(). + +Currently supported configuration attributes are: + + num_lines - an unsigned integer value defining the number of GPIO lines to + export + + label - a string defining the label for the GPIO chip + + line_names - a list of GPIO line names in the form of quoted strings + separated by commas, e.g.: '"foo", "bar", "", "foobar"'. The + number of strings doesn't have to be equal to the value set in + the num_lines attribute. If it's lower than the number of lines, + the remaining lines are unnamed. If it's larger, the superfluous + lines are ignored. A name of the form: '""' means the line + should be unnamed. + +Additionally two read-only attributes named 'chip_name' and 'dev_name' are +exposed in order to provide users with a mapping from configfs directories to +the actual devices created in the kernel. The former returns the name of the +GPIO device as assigned by gpiolib (i.e. "gpiochip0", "gpiochip1", etc.). The +latter returns the parent device name as defined by the gpio-sim driver (i.e. +"gpio-sim.0", "gpio-sim.1", etc.). This allows user-space to map the configfs +items both to the correct character device file as well as the associated entry +in sysfs. + +Simulated GPIO chips can also be defined in device-tree. The compatible string +must be: "gpio-simulator". Supported properties are: + + "gpio-sim,label" - chip label + + "gpio-sim,nr-gpios" - number of lines + +Other standard GPIO properties (like "gpio-line-names" and gpio-hog) are also +supported. + +Manipulating simulated lines +---------------------------- + +Each simulated GPIO chip creates a sysfs attribute group under its device +directory called 'line-ctrl'. Inside each group, there's a separate attribute +for each GPIO line. The name of the attribute is of the form 'gpioX' where X +is the line's offset in the chip. + +Reading from a line attribute returns the current value. Writing to it (0 or 1) +changes the configuration of the simulated pull-up/pull-down resistor +(1 - pull-up, 0 - pull-down). diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e3607ec4c2e8..b6b6150d0d04 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1633,6 +1633,14 @@ config GPIO_MOCKUP tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in it. +config GPIO_SIM + tristate "GPIO Simulator Module" + select IRQ_SIM + select CONFIGFS_FS + help + This enables the GPIO simulator - a configfs-based GPIO testing + driver. + endmenu endif diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c58a90a3c3b1..d717aa85f8e1 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -130,6 +130,7 @@ obj-$(CONFIG_GPIO_SAMA5D2_PIOBU) += gpio-sama5d2-piobu.o obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o obj-$(CONFIG_GPIO_SCH) += gpio-sch.o obj-$(CONFIG_GPIO_SIFIVE) += gpio-sifive.o +obj-$(CONFIG_GPIO_SIM) += gpio-sim.o obj-$(CONFIG_GPIO_SIOX) += gpio-siox.o obj-$(CONFIG_GPIO_SL28CPLD) += gpio-sl28cpld.o obj-$(CONFIG_GPIO_SODAVILLE) += gpio-sodaville.o diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c new file mode 100644 index 000000000000..a1807f518837 --- /dev/null +++ b/drivers/gpio/gpio-sim.c @@ -0,0 +1,874 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * GPIO testing driver based on configfs. + * + * Copyright (C) 2021 Bartosz Golaszewski + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gpiolib.h" + +static DEFINE_IDA(gpio_sim_ida); + +struct gpio_sim_chip { + struct gpio_chip gc; + unsigned long *directions; + unsigned long *values; + unsigned long *pulls; + struct irq_domain *irq_sim; + struct mutex lock; + struct attribute_group attr_group; +}; + +struct gpio_sim_attribute { + struct device_attribute dev_attr; + unsigned int offset; +}; + +static struct gpio_sim_attribute * +to_gpio_sim_attr(struct device_attribute *dev_attr) +{ + return container_of(dev_attr, struct gpio_sim_attribute, dev_attr); +} + +static int gpio_sim_apply_pull(struct gpio_sim_chip *chip, + unsigned int offset, int value) +{ + int curr_val, irq, irq_type, ret; + struct gpio_desc *desc; + struct gpio_chip *gc; + + gc = &chip->gc; + desc = &gc->gpiodev->descs[offset]; + + mutex_lock(&chip->lock); + + if (test_bit(FLAG_REQUESTED, &desc->flags) && + !test_bit(FLAG_IS_OUT, &desc->flags)) { + curr_val = !!test_bit(offset, chip->values); + if (curr_val == value) + goto set_pull; + + /* + * This is fine - it just means, nobody is listening + * for interrupts on this line, otherwise + * irq_create_mapping() would have been called from + * the to_irq() callback. + */ + irq = irq_find_mapping(chip->irq_sim, offset); + if (!irq) + goto set_value; + + irq_type = irq_get_trigger_type(irq); + + if ((value && (irq_type & IRQ_TYPE_EDGE_RISING)) || + (!value && (irq_type & IRQ_TYPE_EDGE_FALLING))) { + ret = irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, + true); + if (ret) + goto set_pull; + } + } + +set_value: + /* Change the value unless we're actively driving the line. */ + if (!test_bit(FLAG_REQUESTED, &desc->flags) || + !test_bit(FLAG_IS_OUT, &desc->flags)) + __assign_bit(offset, chip->values, value); + +set_pull: + __assign_bit(offset, chip->pulls, value); + mutex_unlock(&chip->lock); + return 0; +} + +static int gpio_sim_get(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + int ret; + + mutex_lock(&chip->lock); + ret = !!test_bit(offset, chip->values); + mutex_unlock(&chip->lock); + + return ret; +} + +static void gpio_sim_set(struct gpio_chip *gc, unsigned int offset, int value) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + __assign_bit(offset, chip->values, value); + mutex_unlock(&chip->lock); +} + +static int gpio_sim_get_multiple(struct gpio_chip *gc, + unsigned long *mask, unsigned long *bits) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + bitmap_copy(bits, chip->values, gc->ngpio); + mutex_unlock(&chip->lock); + + return 0; +} + +static void gpio_sim_set_multiple(struct gpio_chip *gc, + unsigned long *mask, unsigned long *bits) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + bitmap_copy(chip->values, bits, gc->ngpio); + mutex_unlock(&chip->lock); +} + +static int gpio_sim_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + __clear_bit(offset, chip->directions); + __assign_bit(offset, chip->values, value); + mutex_unlock(&chip->lock); + + return 0; +} + +static int gpio_sim_direction_input(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + __set_bit(offset, chip->directions); + mutex_unlock(&chip->lock); + + return 0; +} + +static int gpio_sim_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + int direction; + + mutex_lock(&chip->lock); + direction = !!test_bit(offset, chip->directions); + mutex_unlock(&chip->lock); + + return direction ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT; +} + +static int gpio_sim_set_config(struct gpio_chip *gc, + unsigned int offset, unsigned long config) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_PULL_UP: + return gpio_sim_apply_pull(chip, offset, 1); + case PIN_CONFIG_BIAS_PULL_DOWN: + return gpio_sim_apply_pull(chip, offset, 0); + default: + break; + } + + return -ENOTSUPP; +} + +static int gpio_sim_to_irq(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + return irq_create_mapping(chip->irq_sim, offset); +} + +static void gpio_sim_free(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + mutex_lock(&chip->lock); + __assign_bit(offset, chip->values, !!test_bit(offset, chip->pulls)); + mutex_unlock(&chip->lock); +} + +static ssize_t gpio_sim_sysfs_line_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct gpio_sim_attribute *line_attr = to_gpio_sim_attr(attr); + struct gpio_sim_chip *chip = dev_get_drvdata(dev); + int ret; + + mutex_lock(&chip->lock); + ret = sysfs_emit(buf, "%u\n", + !!test_bit(line_attr->offset, chip->values)); + mutex_unlock(&chip->lock); + + return ret; +} + +static ssize_t gpio_sim_sysfs_line_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct gpio_sim_attribute *line_attr = to_gpio_sim_attr(attr); + struct gpio_sim_chip *chip = dev_get_drvdata(dev); + int ret, val; + + if (len > 2 || (buf[0] != '0' && buf[0] != '1')) + return -EINVAL; + + val = buf[0] == '0' ? 0 : 1; + + ret = gpio_sim_apply_pull(chip, line_attr->offset, val); + if (ret) + return ret; + + return len; +} + +static void gpio_sim_mutex_destroy(void *data) +{ + struct mutex *lock = data; + + mutex_destroy(lock); +} + +static void gpio_sim_sysfs_remove(void *data) +{ + struct gpio_sim_chip *chip = data; + + sysfs_remove_group(&chip->gc.parent->kobj, &chip->attr_group); +} + +static int gpio_sim_setup_sysfs(struct gpio_sim_chip *chip) +{ + unsigned int i, num_lines = chip->gc.ngpio; + struct device *dev = chip->gc.parent; + struct gpio_sim_attribute *line_attr; + struct device_attribute *dev_attr; + struct attribute **attrs; + int ret; + + attrs = devm_kcalloc(dev, sizeof(*attrs), num_lines + 1, GFP_KERNEL); + if (!attrs) + return -ENOMEM; + + for (i = 0; i < num_lines; i++) { + line_attr = devm_kzalloc(dev, sizeof(*line_attr), GFP_KERNEL); + if (!line_attr) + return -ENOMEM; + + line_attr->offset = i; + + dev_attr = &line_attr->dev_attr; + + dev_attr->attr.name = devm_kasprintf(dev, GFP_KERNEL, + "gpio%u", i); + if (!dev_attr->attr.name) + return -ENOMEM; + + dev_attr->attr.mode = 0644; + + dev_attr->show = gpio_sim_sysfs_line_show; + dev_attr->store = gpio_sim_sysfs_line_store; + + attrs[i] = &dev_attr->attr; + } + + chip->attr_group.name = "line-ctrl"; + chip->attr_group.attrs = attrs; + + ret = sysfs_create_group(&dev->kobj, &chip->attr_group); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, gpio_sim_sysfs_remove, chip); +} + +static int gpio_sim_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct gpio_sim_chip *chip; + struct gpio_chip *gc; + const char *label; + u32 num_lines; + int ret; + + ret = device_property_read_u32(dev, "gpio-sim,nr-gpios", &num_lines); + if (ret) + return ret; + + ret = device_property_read_string(dev, "gpio-sim,label", &label); + if (ret) + label = dev_name(dev); + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->directions = devm_bitmap_alloc(dev, num_lines, GFP_KERNEL); + if (!chip->directions) + return -ENOMEM; + + /* Default to input mode. */ + bitmap_fill(chip->directions, num_lines); + + chip->values = devm_bitmap_zalloc(dev, num_lines, GFP_KERNEL); + if (!chip->values) + return -ENOMEM; + + chip->pulls = devm_bitmap_zalloc(dev, num_lines, GFP_KERNEL); + if (!chip->pulls) + return -ENOMEM; + + chip->irq_sim = devm_irq_domain_create_sim(dev, NULL, num_lines); + if (IS_ERR(chip->irq_sim)) + return PTR_ERR(chip->irq_sim); + + mutex_init(&chip->lock); + ret = devm_add_action_or_reset(dev, gpio_sim_mutex_destroy, + &chip->lock); + if (ret) + return ret; + + gc = &chip->gc; + gc->base = -1; + gc->ngpio = num_lines; + gc->label = label; + gc->owner = THIS_MODULE; + gc->parent = dev; + gc->get = gpio_sim_get; + gc->set = gpio_sim_set; + gc->get_multiple = gpio_sim_get_multiple; + gc->set_multiple = gpio_sim_set_multiple; + gc->direction_output = gpio_sim_direction_output; + gc->direction_input = gpio_sim_direction_input; + gc->get_direction = gpio_sim_get_direction; + gc->set_config = gpio_sim_set_config; + gc->to_irq = gpio_sim_to_irq; + gc->free = gpio_sim_free; + + ret = devm_gpiochip_add_data(dev, gc, chip); + if (ret) + return ret; + + /* Used by sysfs and configfs callbacks. */ + dev_set_drvdata(dev, chip); + + ret = gpio_sim_setup_sysfs(chip); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id gpio_sim_of_match[] = { + { .compatible = "gpio-simulator" }, + { } +}; +MODULE_DEVICE_TABLE(of, gpio_sim_of_match); + +static struct platform_driver gpio_sim_driver = { + .driver = { + .name = "gpio-sim", + }, + .probe = gpio_sim_probe, +}; + +struct gpio_sim_chip_config { + struct config_item item; + + /* + * If pdev is NULL, the item is 'pending' (waiting for configuration). + * Once the pointer is assigned, the device has been created and the + * item is 'live'. + */ + struct platform_device *pdev; + + /* + * Each configfs filesystem operation is protected with the subsystem + * mutex. Each separate attribute is protected with the buffer mutex. + * This structure however can be modified by callbacks of different + * attributes so we need another lock. + */ + struct mutex lock; + + char label[32]; + unsigned int num_lines; + char **line_names; + unsigned int num_line_names; +}; + +static struct gpio_sim_chip_config * +to_gpio_sim_chip_config(struct config_item *item) +{ + return container_of(item, struct gpio_sim_chip_config, item); +} + +static ssize_t gpio_sim_config_dev_name_show(struct config_item *item, + char *page) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + struct platform_device *pdev; + int ret; + + mutex_lock(&config->lock); + pdev = config->pdev; + if (pdev) + ret = sprintf(page, "%s\n", dev_name(&pdev->dev)); + else + ret = sprintf(page, "none\n"); + mutex_unlock(&config->lock); + + return ret; +} + +CONFIGFS_ATTR_RO(gpio_sim_config_, dev_name); + +static ssize_t gpio_sim_config_chip_name_show(struct config_item *item, + char *page) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + struct gpio_sim_chip *chip = NULL; + struct platform_device *pdev; + int ret; + + mutex_lock(&config->lock); + pdev = config->pdev; + if (pdev) + chip = dev_get_drvdata(&pdev->dev); + + if (chip) + ret = sprintf(page, "%s\n", dev_name(&chip->gc.gpiodev->dev)); + else + ret = sprintf(page, "none\n"); + mutex_unlock(&config->lock); + + return ret; +} + +CONFIGFS_ATTR_RO(gpio_sim_config_, chip_name); + +static ssize_t gpio_sim_config_label_show(struct config_item *item, char *page) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + int ret; + + mutex_lock(&config->lock); + ret = sprintf(page, "%s\n", config->label); + mutex_unlock(&config->lock); + + return ret; +} + +static ssize_t gpio_sim_config_label_store(struct config_item *item, + const char *page, size_t count) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + char *dup, *trimmed; + int ret; + + mutex_lock(&config->lock); + + if (config->pdev) { + mutex_unlock(&config->lock); + return -EBUSY; + } + + dup = kstrndup(page, count, GFP_KERNEL); + if (!dup) { + mutex_unlock(&config->lock); + return -ENOMEM; + } + + trimmed = strstrip(dup); + ret = snprintf(config->label, sizeof(config->label), "%s", trimmed); + kfree(dup); + if (ret < 0) { + mutex_unlock(&config->lock); + return ret; + } + + mutex_unlock(&config->lock); + return count; +} + +CONFIGFS_ATTR(gpio_sim_config_, label); + +static ssize_t gpio_sim_config_num_lines_show(struct config_item *item, + char *page) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + int ret; + + mutex_lock(&config->lock); + ret = sprintf(page, "%u\n", config->num_lines); + mutex_unlock(&config->lock); + + return ret; +} + +static ssize_t gpio_sim_config_num_lines_store(struct config_item *item, + const char *page, size_t count) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + unsigned int num_lines; + int ret; + + mutex_lock(&config->lock); + + if (config->pdev) { + mutex_unlock(&config->lock); + return -EBUSY; + } + + ret = kstrtouint(page, 10, &num_lines); + if (ret) { + mutex_unlock(&config->lock); + return ret; + } + + if (num_lines == 0) { + mutex_unlock(&config->lock); + return -EINVAL; + } + + config->num_lines = num_lines; + + mutex_unlock(&config->lock); + return count; +} + +CONFIGFS_ATTR(gpio_sim_config_, num_lines); + +static ssize_t gpio_sim_config_line_names_show(struct config_item *item, + char *page) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + int ret, i, written = 0; + + mutex_lock(&config->lock); + + if (!config->line_names) { + mutex_unlock(&config->lock); + return sprintf(page, "\n"); + } + + for (i = 0; i < config->num_line_names; i++) { + ret = sprintf(page + written, + i < config->num_line_names - 1 ? "\"%s\", " : "\"%s\"\n", + config->line_names[i] ?: ""); + if (ret < 0) { + mutex_unlock(&config->lock); + return ret; + } + + written += ret; + } + + mutex_unlock(&config->lock); + return written; +} + +static ssize_t gpio_sim_config_line_names_store(struct config_item *item, + const char *page, size_t count) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + unsigned int num_new_names = 1, num_old_names, name_idx = 0; + bool in_quote = false, got_comma = true; + char **new_names, **old_names, *name, c; + const char *start = page; + size_t pos, name_len; + int err = -EINVAL; + + mutex_lock(&config->lock); + + if (config->pdev) { + mutex_unlock(&config->lock); + return -EBUSY; + } + + /* + * Line names are stored in a pointer array so that we can easily + * pass them down to the GPIO subsystem in a "gpio-line-names" + * property. + * + * Line names must be passed as a list of quoted names separated by + * commas, for example: '"foo", "bar", "foobar"'. + */ + + for (pos = 0; pos < count; pos++) { + /* + * Just count the commas and assume the number if strings + * equals the number of commas + 1. If the format is wrong + * we'll bail out anyway. + */ + if (page[pos] == ',') + num_new_names++; + } + + new_names = kcalloc(num_new_names, sizeof(char *), GFP_KERNEL); + if (!new_names) { + mutex_unlock(&config->lock); + return -ENOMEM; + } + + /* + * REVISIT There are more users in the kernel that want to split + * comma-separated strings into tokens. We should generalize it and + * put it into lib/. + */ + for (pos = 0; pos < count; pos++) { + c = page[pos]; + + if (in_quote) { + if (c == '"') { + /* This is the end of the name. */ + in_quote = got_comma = false; + name_len = (page + pos) - start; + if (name_len == 0) { + /* Name is empty (passed as ""). */ + name_idx++; + continue; + } + + name = kmemdup(start, name_len + 1, GFP_KERNEL); + if (!name) { + err = -ENOMEM; + goto err_out; + } + + name[name_len] = '\0'; + new_names[name_idx++] = name; + } + } else { + if (c == '"') { + /* Enforce separating names with commas. */ + if (!got_comma) + goto err_out; + + start = page + pos + 1; + in_quote = true; + } else if (c == ',') { + if (!got_comma) + got_comma = true; + else + /* Double commas are not allowed. */ + goto err_out; + } else if (!isspace(c)) { + goto err_out; + } + } + } + + /* + * End of input sanity checks, must not have a comma at the end and + * must have finished scanning the last name. + */ + if (in_quote || got_comma) + goto err_out; + + old_names = config->line_names; + num_old_names = config->num_line_names; + config->line_names = new_names; + config->num_line_names = num_new_names; + + mutex_unlock(&config->lock); + kfree_strarray(old_names, num_old_names); + return count; + +err_out: + mutex_unlock(&config->lock); + kfree_strarray(new_names, name_idx); + return err; +} + +CONFIGFS_ATTR(gpio_sim_config_, line_names); + +static struct configfs_attribute *gpio_sim_config_attrs[] = { + &gpio_sim_config_attr_dev_name, + &gpio_sim_config_attr_chip_name, + &gpio_sim_config_attr_label, + &gpio_sim_config_attr_num_lines, + &gpio_sim_config_attr_line_names, + NULL +}; + +static void gpio_sim_chip_config_release(struct config_item *item) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + + mutex_destroy(&config->lock); + kfree_strarray(config->line_names, config->num_line_names); + kfree(config); +} + +static struct configfs_item_operations gpio_sim_config_item_ops = { + .release = gpio_sim_chip_config_release, +}; + +static const struct config_item_type gpio_sim_chip_config_type = { + .ct_item_ops = &gpio_sim_config_item_ops, + .ct_attrs = gpio_sim_config_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_item * +gpio_sim_config_make_item(struct config_group *group, const char *name) +{ + struct gpio_sim_chip_config *config; + + config = kzalloc(sizeof(*config), GFP_KERNEL); + if (!config) + return ERR_PTR(-ENOMEM); + + config_item_init_type_name(&config->item, name, + &gpio_sim_chip_config_type); + config->num_lines = 1; + mutex_init(&config->lock); + + return &config->item; +} + +static int gpio_sim_config_commit_item(struct config_item *item) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + struct platform_device_info pdevinfo; + struct property_entry properties[4]; /* Max 3 properties + sentinel. */ + struct platform_device *pdev; + unsigned int prop_idx = 0; + + memset(&pdevinfo, 0, sizeof(pdevinfo)); + memset(properties, 0, sizeof(properties)); + + mutex_lock(&config->lock); + + properties[prop_idx++] = PROPERTY_ENTRY_U32("gpio-sim,nr-gpios", + config->num_lines); + + if (config->label[0] != '\0') + properties[prop_idx++] = PROPERTY_ENTRY_STRING("gpio-sim,label", + config->label); + + if (config->line_names) + properties[prop_idx++] = PROPERTY_ENTRY_STRING_ARRAY_LEN( + "gpio-line-names", + config->line_names, + config->num_line_names); + + pdevinfo.id = ida_alloc(&gpio_sim_ida, GFP_KERNEL); + if (pdevinfo.id < 0) { + mutex_unlock(&config->lock); + return pdevinfo.id; + } + + pdevinfo.name = "gpio-sim"; + pdevinfo.properties = properties; + + pdev = platform_device_register_full(&pdevinfo); + if (IS_ERR(pdev)) { + ida_free(&gpio_sim_ida, pdevinfo.id); + mutex_unlock(&config->lock); + return PTR_ERR(pdev); + } + + config->pdev = pdev; + mutex_unlock(&config->lock); + + return 0; +} + +static int gpio_sim_config_uncommit_item(struct config_item *item) +{ + struct gpio_sim_chip_config *config = to_gpio_sim_chip_config(item); + int id; + + mutex_lock(&config->lock); + id = config->pdev->id; + platform_device_unregister(config->pdev); + config->pdev = NULL; + mutex_unlock(&config->lock); + + ida_free(&gpio_sim_ida, id); + return 0; +} + +static struct configfs_group_operations gpio_sim_config_group_ops = { + .make_item = gpio_sim_config_make_item, + .commit_item = gpio_sim_config_commit_item, + .uncommit_item = gpio_sim_config_uncommit_item, +}; + +static const struct config_item_type gpio_sim_config_type = { + .ct_group_ops = &gpio_sim_config_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem gpio_sim_config_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "gpio-sim", + .ci_type = &gpio_sim_config_type, + }, + }, +}; + +static int __init gpio_sim_init(void) +{ + int ret; + + ret = platform_driver_register(&gpio_sim_driver); + if (ret) { + pr_err("Error %d while registering the platform driver\n", ret); + return ret; + } + + config_group_init(&gpio_sim_config_subsys.su_group); + mutex_init(&gpio_sim_config_subsys.su_mutex); + ret = configfs_register_subsystem(&gpio_sim_config_subsys); + if (ret) { + pr_err("Error %d while registering the configfs subsystem %s\n", + ret, gpio_sim_config_subsys.su_group.cg_item.ci_namebuf); + mutex_destroy(&gpio_sim_config_subsys.su_mutex); + platform_driver_unregister(&gpio_sim_driver); + return ret; + } + + return 0; +} +module_init(gpio_sim_init); + +static void __exit gpio_sim_exit(void) +{ + configfs_unregister_subsystem(&gpio_sim_config_subsys); + mutex_destroy(&gpio_sim_config_subsys.su_mutex); + platform_driver_unregister(&gpio_sim_driver); +} +module_exit(gpio_sim_exit); + +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_DESCRIPTION("GPIO Simulator Module"); +MODULE_LICENSE("GPL"); From patchwork Fri Mar 12 09:56:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399080 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 9E9B2C28E89 for ; 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[90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:30 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 09/11] selftests: gpio: provide a helper for reading chip info Date: Fri, 12 Mar 2021 10:56:58 +0100 Message-Id: <20210312095700.16277-10-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Add a simple program that allows to retrieve chip properties from the GPIO character device. This will be used in gpio-sim selftests. Signed-off-by: Bartosz Golaszewski --- tools/testing/selftests/gpio/.gitignore | 1 + tools/testing/selftests/gpio/Makefile | 2 +- tools/testing/selftests/gpio/gpio-chip-info.c | 57 +++++++++++++++++++ 3 files changed, 59 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/gpio/gpio-chip-info.c diff --git a/tools/testing/selftests/gpio/.gitignore b/tools/testing/selftests/gpio/.gitignore index a4969f7ee020..4ea4f58dab1a 100644 --- a/tools/testing/selftests/gpio/.gitignore +++ b/tools/testing/selftests/gpio/.gitignore @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only gpio-mockup-cdev +gpio-chip-info diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile index 39f2bbe8dd3d..84b48547f94c 100644 --- a/tools/testing/selftests/gpio/Makefile +++ b/tools/testing/selftests/gpio/Makefile @@ -2,6 +2,6 @@ TEST_PROGS := gpio-mockup.sh TEST_FILES := gpio-mockup-sysfs.sh -TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev +TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info include ../lib.mk diff --git a/tools/testing/selftests/gpio/gpio-chip-info.c b/tools/testing/selftests/gpio/gpio-chip-info.c new file mode 100644 index 000000000000..4d26fa7c254a --- /dev/null +++ b/tools/testing/selftests/gpio/gpio-chip-info.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * GPIO character device helper for reading chip information. + * + * Copyright (C) 2021 Bartosz Golaszewski + */ + +#include +#include +#include +#include +#include +#include +#include + +static void print_usage(void) +{ + printf("usage:\n"); + printf(" gpio-chip-info [name|label|num-lines]\n"); +} + +int main(int argc, char **argv) +{ + struct gpiochip_info info; + int fd, ret; + + if (argc !=3) { + print_usage(); + return EXIT_FAILURE; + } + + fd = open(argv[1], O_RDWR); + if (fd < 0) { + perror("unable to open the GPIO chip"); + return EXIT_FAILURE; + } + + memset(&info, 0, sizeof(info)); + ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &info); + if (ret) { + perror("chip info ioctl failed"); + return EXIT_FAILURE; + } + + if (strcmp(argv[2], "name") == 0) { + printf("%s\n", info.name); + } else if (strcmp(argv[2], "label") == 0) { + printf("%s\n", info.label); + } else if (strcmp(argv[2], "num-lines") == 0) { + printf("%u\n", info.lines); + } else { + fprintf(stderr, "unknown command: %s\n", argv[2]); + return EXIT_FAILURE; + } + + return EXIT_SUCCESS; +} From patchwork Fri Mar 12 09:56:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399082 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=-13.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, 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 8054CC28E88 for ; 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[90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:32 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 10/11] selftests: gpio: add a helper for reading GPIO line names Date: Fri, 12 Mar 2021 10:56:59 +0100 Message-Id: <20210312095700.16277-11-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Add a simple program that allows to read GPIO line names from the character device. This will be used in gpio-sim selftests. Signed-off-by: Bartosz Golaszewski --- tools/testing/selftests/gpio/.gitignore | 1 + tools/testing/selftests/gpio/Makefile | 2 +- tools/testing/selftests/gpio/gpio-line-name.c | 55 +++++++++++++++++++ 3 files changed, 57 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/gpio/gpio-line-name.c diff --git a/tools/testing/selftests/gpio/.gitignore b/tools/testing/selftests/gpio/.gitignore index 4ea4f58dab1a..ededb077a3a6 100644 --- a/tools/testing/selftests/gpio/.gitignore +++ b/tools/testing/selftests/gpio/.gitignore @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only gpio-mockup-cdev gpio-chip-info +gpio-line-name diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile index 84b48547f94c..d7d8f1985d99 100644 --- a/tools/testing/selftests/gpio/Makefile +++ b/tools/testing/selftests/gpio/Makefile @@ -2,6 +2,6 @@ TEST_PROGS := gpio-mockup.sh TEST_FILES := gpio-mockup-sysfs.sh -TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info +TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info gpio-line-name include ../lib.mk diff --git a/tools/testing/selftests/gpio/gpio-line-name.c b/tools/testing/selftests/gpio/gpio-line-name.c new file mode 100644 index 000000000000..a52e75bc37ba --- /dev/null +++ b/tools/testing/selftests/gpio/gpio-line-name.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * GPIO character device helper for reading line names. + * + * Copyright (C) 2021 Bartosz Golaszewski + */ + +#include +#include +#include +#include +#include +#include +#include + +static void print_usage(void) +{ + printf("usage:\n"); + printf(" gpio-line-name \n"); +} + +int main(int argc, char **argv) +{ + struct gpio_v2_line_info info; + int fd, ret; + char *endp; + + if (argc != 3) { + print_usage(); + return EXIT_FAILURE; + } + + fd = open(argv[1], O_RDWR); + if (fd < 0) { + perror("unable to open the GPIO chip"); + return EXIT_FAILURE; + } + + memset(&info, 0, sizeof(info)); + info.offset = strtoul(argv[2], &endp, 10); + if (*endp != '\0') { + print_usage(); + return EXIT_FAILURE; + } + + ret = ioctl(fd, GPIO_V2_GET_LINEINFO_IOCTL, &info); + if (ret) { + perror("line info ioctl failed"); + return EXIT_FAILURE; + } + + printf("%s\n", info.name); + + return EXIT_SUCCESS; +} From patchwork Fri Mar 12 09:57:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 399081 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 3753FC28E87 for ; 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[90.8.158.167]) by smtp.gmail.com with ESMTPSA id x13sm7031630wrt.75.2021.03.12.01.57.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 01:57:33 -0800 (PST) From: Bartosz Golaszewski To: Joel Becker , Christoph Hellwig , Shuah Khan , Linus Walleij , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Kent Gibson , Jonathan Corbet , Greg Kroah-Hartman Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 11/11] selftests: gpio: add test cases for gpio-sim Date: Fri, 12 Mar 2021 10:57:00 +0100 Message-Id: <20210312095700.16277-12-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210312095700.16277-1-brgl@bgdev.pl> References: <20210312095700.16277-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Add a set of tests for the new gpio-sim module. This is a pure shell test-suite and uses the helper programs available in the gpio selftests directory. These test-cases only test the functionalities exposed by the gpio-sim driver, not those handled by core gpiolib code. Signed-off-by: Bartosz Golaszewski --- tools/testing/selftests/gpio/Makefile | 2 +- tools/testing/selftests/gpio/config | 1 + tools/testing/selftests/gpio/gpio-sim.sh | 229 +++++++++++++++++++++++ 3 files changed, 231 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/gpio/gpio-sim.sh diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile index d7d8f1985d99..4c6df61c76a8 100644 --- a/tools/testing/selftests/gpio/Makefile +++ b/tools/testing/selftests/gpio/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 -TEST_PROGS := gpio-mockup.sh +TEST_PROGS := gpio-mockup.sh gpio-sim.sh TEST_FILES := gpio-mockup-sysfs.sh TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info gpio-line-name diff --git a/tools/testing/selftests/gpio/config b/tools/testing/selftests/gpio/config index ce100342c20b..409a8532facc 100644 --- a/tools/testing/selftests/gpio/config +++ b/tools/testing/selftests/gpio/config @@ -1,3 +1,4 @@ CONFIG_GPIOLIB=y CONFIG_GPIO_CDEV=y CONFIG_GPIO_MOCKUP=m +CONFIG_GPIO_SIM=m diff --git a/tools/testing/selftests/gpio/gpio-sim.sh b/tools/testing/selftests/gpio/gpio-sim.sh new file mode 100755 index 000000000000..fcca6ec611f8 --- /dev/null +++ b/tools/testing/selftests/gpio/gpio-sim.sh @@ -0,0 +1,229 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 Bartosz Golaszewski + +BASE_DIR=`dirname $0` +CONFIGFS_DIR="/sys/kernel/config/gpio-sim" +PENDING_DIR=$CONFIGFS_DIR/pending +LIVE_DIR=$CONFIGFS_DIR/live +MODULE="gpio-sim" + +fail() { + echo "$*" >&2 + echo "GPIO $MODULE test FAIL" + exit 1 +} + +skip() { + echo "$*" >&2 + echo "GPIO $MODULE test SKIP" + exit 4 +} + +configfs_cleanup() { + for DIR in `ls $LIVE_DIR`; do + mv $LIVE_DIR/$DIR $PENDING_DIR + done + + for DIR in `ls $PENDING_DIR`; do + rmdir $PENDING_DIR/$DIR + done +} + +create_pending_chip() { + local NAME="$1" + local LABEL="$2" + local NUM_LINES="$3" + local LINE_NAMES="$4" + local CHIP_DIR="$PENDING_DIR/$NAME" + + mkdir $CHIP_DIR + test -n "$LABEL" && echo $LABEL > $CHIP_DIR/label + test -n "$NUM_LINES" && echo $NUM_LINES > $CHIP_DIR/num_lines + if [ -n "$LINE_NAMES" ]; then + echo $LINE_NAMES 2> /dev/null > $CHIP_DIR/line_names + # This one can fail + if [ "$?" -ne "0" ]; then + return 1 + fi + fi +} + +create_live_chip() { + local CHIP_DIR="$PENDING_DIR/$1" + + create_pending_chip "$@" || fail "unable to create the chip configfs item" + mv $CHIP_DIR $LIVE_DIR || fail "unable to commit the chip configfs item" +} + +remove_pending_chip() { + local NAME="$1" + + rmdir $PENDING_DIR/$NAME || fail "unable to remove the chip configfs item" +} + +remove_live_chip() { + local NAME="$1" + + mv $LIVE_DIR/$NAME $PENDING_DIR || fail "unable to uncommit the chip configfs item" + remove_pending_chip "$@" +} + +configfs_chip_name() { + local CHIP="$1" + + cat $LIVE_DIR/$CHIP/chip_name 2> /dev/null || return 1 +} + +configfs_dev_name() { + local CHIP="$1" + + cat $LIVE_DIR/$CHIP/dev_name 2> /dev/null || return 1 +} + +get_chip_num_lines() { + local CHIP="$1" + + $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP` num-lines +} + +get_chip_label() { + local CHIP="$1" + + $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP` label +} + +get_line_name() { + local CHIP="$1" + local OFFSET="$2" + + $BASE_DIR/gpio-line-name /dev/`configfs_chip_name $CHIP` $OFFSET +} + +sysfs_set_pull() { + local CHIP="$1" + local OFFSET="$2" + local PULL="$3" + local SYSFSPATH="/sys/devices/platform/`configfs_dev_name $CHIP`/line-ctrl/gpio$OFFSET" + + echo $PULL > $SYSFSPATH +} + +# Load the gpio-sim module. This will pull in configfs if needed too. +modprobe gpio-sim || skip "unable to load the gpio-sim module" +# Make sure configfs is mounted at /sys/kernel/config. Wait a bit if needed. +for IDX in `seq 5`; do + if [ "$IDX" -eq "5" ]; then + skip "configfs not mounted at /sys/kernel/config" + fi + + mountpoint -q /sys/kernel/config && break + sleep 0.1 +done +# If the module was already loaded: remove all previous chips +configfs_cleanup + +trap "exit 1" SIGTERM SIGINT +trap configfs_cleanup EXIT + +echo "1. chip_name and dev_name attributes" + +echo "1.1. Chip name is communicated to user" +create_live_chip chip +test -n `cat $LIVE_DIR/chip/chip_name` || fail "chip_name doesn't work" +remove_live_chip chip + +echo "1.2. chip_name returns 'none' if the chip is still pending" +create_pending_chip chip +test "`cat $PENDING_DIR/chip/chip_name`" = "none" || fail "chip_name doesn't return 'none' for a pending chip" +remove_pending_chip chip + +echo "1.3. Device name is communicated to user" +create_live_chip chip +test -n `cat $LIVE_DIR/chip/dev_name` || fail "dev_name doesn't work" +remove_live_chip chip + +echo "1.4. dev_name returns 'none' if chip is still pending" +create_pending_chip chip +test "`cat $PENDING_DIR/chip/dev_name`" = "none" || fail "dev_name doesn't return 'none' for a pending chip" +remove_pending_chip chip + +echo "2. Creating simulated chips" + +echo "2.1. Default number of lines is 1" +create_live_chip chip +test "`get_chip_num_lines chip`" = "1" || fail "default number of lines is not 1" +remove_live_chip chip + +echo "2.2. Number of lines can be specified" +create_live_chip chip test-label 16 +test "`get_chip_num_lines chip`" = "16" || fail "number of lines is not 16" +remove_live_chip chip + +echo "2.3. Label can be set" +create_live_chip chip foobar +test "`get_chip_label chip`" = "foobar" || fail "label is incorrect" +remove_live_chip chip + +echo "2.4. Label can be left empty" +create_live_chip chip +test -z "`cat $LIVE_DIR/chip/label`" || fail "label is not empty" +remove_live_chip chip + +echo "2.5. Line names can be configured" +create_live_chip chip test-label 16 '"foo", "", "bar"' +test "`get_line_name chip 0`" = "foo" || fail "line name is incorrect" +test "`get_line_name chip 2`" = "bar" || fail "line name is incorrect" +remove_live_chip chip + +echo "2.6. Errors in line names are detected" +create_pending_chip chip test-label 8 '"foo", bar' && fail "incorrect line name accepted" +remove_pending_chip chip +create_pending_chip chip test-label 8 '"foo" "bar"' && fail "incorrect line name accepted" +remove_pending_chip chip + +echo "2.7. Multiple chips can be created" +create_live_chip chip0 +create_live_chip chip1 +create_live_chip chip2 +remove_live_chip chip0 +remove_live_chip chip1 +remove_live_chip chip2 + +echo "3. Controlling simulated chips" + +echo "3.3. Pull can be set over sysfs" +create_live_chip chip test-label 8 +sysfs_set_pull chip 0 1 +$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip` 0 +test "$?" = "1" || fail "pull set incorrectly" +sysfs_set_pull chip 0 0 +$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip` 1 +test "$?" = "0" || fail "pull set incorrectly" +remove_live_chip chip + +echo "3.4. Incorrect input in sysfs is rejected" +create_live_chip chip test-label 8 +SYSFS_PATH="/sys/devices/platform/`configfs_dev_name chip`/line-ctrl/gpio0" +echo 2 > $SYSFS_PATH 2> /dev/null && fail "invalid input not detectec" +remove_live_chip chip + +echo "4. Simulated GPIO chips are functional" + +echo "4.1. Values can be read from sysfs" +create_live_chip chip test-label 8 +SYSFS_PATH="/sys/devices/platform/`configfs_dev_name chip`/line-ctrl/gpio0" +test `cat $SYSFS_PATH` = "0" || fail "incorrect value read from sysfs" +$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip` 0 & +sleep 0.1 # FIXME Any better way? +test `cat $SYSFS_PATH` = "1" || fail "incorrect value read from sysfs" +kill $! +remove_live_chip chip + +echo "4.2. Bias settings work correctly" +create_live_chip chip test-label 8 +$BASE_DIR/gpio-mockup-cdev -b pull-up /dev/`configfs_chip_name chip` 0 +test `cat $SYSFS_PATH` = "1" || fail "bias setting does not work" +remove_live_chip chip + +echo "GPIO $MODULE test PASS"