From patchwork Tue Feb 16 15:57:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 12090183 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, 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 3243EC433E0 for ; Tue, 16 Feb 2021 15:57:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D37E464D9F for ; Tue, 16 Feb 2021 15:57:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D37E464D9F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5C2F489D42; Tue, 16 Feb 2021 15:57:28 +0000 (UTC) Received: from hillosipuli.retiisi.eu (retiisi.eu [95.216.213.190]) by gabe.freedesktop.org (Postfix) with ESMTPS id E78D989CE2 for ; Tue, 16 Feb 2021 15:57:26 +0000 (UTC) Received: from lanttu.localdomain (lanttu-e.localdomain [192.168.1.64]) by hillosipuli.retiisi.eu (Postfix) with ESMTP id 5186D634CC0; Tue, 16 Feb 2021 17:56:20 +0200 (EET) From: Sakari Ailus To: dri-devel@lists.freedesktop.org Subject: [PATCH v9 1/4] lib/vsprintf: Add support for printing V4L2 and DRM fourccs Date: Tue, 16 Feb 2021 17:57:20 +0200 Message-Id: <20210216155723.17109-2-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210216155723.17109-1-sakari.ailus@linux.intel.com> References: <20210216155723.17109-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Petr Mladek , mchehab@kernel.org, Thomas Zimmermann , Dave Stevenson , Rasmus Villemoes , linux-kernel@vger.kernel.org, Steven Rostedt , hverkuil@xs4all.nl, Sergey Senozhatsky , laurent.pinchart@ideasonboard.com, Joe Perches , Andy Shevchenko , linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM pixel formats denoted by fourccs. The fourcc encoding is the same for both so the same implementation can be used. Suggested-by: Mauro Carvalho Chehab Signed-off-by: Sakari Ailus Reviewed-by: Petr Mladek Reviewed-by: Sergey Senozhatsky Reviewed-by: Andy Shevchenko --- Documentation/core-api/printk-formats.rst | 18 +++++++++++ lib/test_printf.c | 18 +++++++++++ lib/vsprintf.c | 39 +++++++++++++++++++++++ scripts/checkpatch.pl | 6 ++-- 4 files changed, 79 insertions(+), 2 deletions(-) diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index 160e710d992f..8267675ea95c 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -567,6 +567,24 @@ For printing netdev_features_t. Passed by reference. +V4L2 and DRM FourCC code (pixel format) +--------------------------------------- + +:: + + %p4cc + +Print a FourCC code used by V4L2 or DRM, including format endianness and +its numerical value as hexadecimal. + +Passed by reference. + +Examples:: + + %p4cc BG12 little-endian (0x32314742) + %p4cc Y10 little-endian (0x20303159) + %p4cc NV12 big-endian (0xb231564e) + Thanks ====== diff --git a/lib/test_printf.c b/lib/test_printf.c index 7d60f24240a4..8558ddbde692 100644 --- a/lib/test_printf.c +++ b/lib/test_printf.c @@ -647,6 +647,23 @@ static void __init fwnode_pointer(void) software_node_unregister_nodes(softnodes); } +static void __init fourcc_pointer(void) +{ + struct { + u32 code; + char *str; + } const try[] = { + { 0x3231564e, "NV12 little-endian (0x3231564e)", }, + { 0xb231564e, "NV12 big-endian (0xb231564e)", }, + { 0x10111213, ".... little-endian (0x10111213)", }, + { 0x20303159, "Y10 little-endian (0x20303159)", }, + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(try); i++) + test(try[i].str, "%p4cc", &try[i].code); +} + static void __init errptr(void) { @@ -692,6 +709,7 @@ test_pointer(void) flags(); errptr(); fwnode_pointer(); + fourcc_pointer(); } static void __init selftest(void) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 3b53c73580c5..62c7224a5076 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr, return special_hex_number(buf, end, num, size); } +static noinline_for_stack +char *fourcc_string(char *buf, char *end, const u32 *fourcc, + struct printf_spec spec, const char *fmt) +{ + char output[sizeof("0123 little-endian (0x01234567)")]; + char *p = output; + unsigned int i; + u32 val; + + if (fmt[1] != 'c' || fmt[2] != 'c') + return error_string(buf, end, "(%p4?)", spec); + + if (check_pointer(&buf, end, fourcc, spec)) + return buf; + + val = *fourcc & ~BIT(31); + + for (i = 0; i < sizeof(*fourcc); i++) { + unsigned char c = val >> (i * 8); + + /* Print non-control ASCII characters as-is, dot otherwise */ + *p++ = isascii(c) && isprint(c) ? c : '.'; + } + + strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian"); + p += strlen(p); + + *p++ = ' '; + *p++ = '('; + p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32)); + *p++ = ')'; + *p = '\0'; + + return string(buf, end, output, spec); +} + static noinline_for_stack char *address_val(char *buf, char *end, const void *addr, struct printf_spec spec, const char *fmt) @@ -2162,6 +2198,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode, * correctness of the format string and va_list arguments. * - 'K' For a kernel pointer that should be hidden from unprivileged users * - 'NF' For a netdev_features_t + * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value. * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with * a certain separator (' ' by default): * C colon @@ -2259,6 +2296,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, return restricted_pointer(buf, end, ptr, spec); case 'N': return netdev_bits(buf, end, ptr, spec, fmt); + case '4': + return fourcc_string(buf, end, ptr, spec, fmt); case 'a': return address_val(buf, end, ptr, spec, fmt); case 'd': diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 92e888ed939f..79858e07d023 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6557,9 +6557,11 @@ sub process { $specifier = $1; $extension = $2; $qualifier = $3; - if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ || + if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ || ($extension eq "f" && - defined $qualifier && $qualifier !~ /^w/)) { + defined $qualifier && $qualifier !~ /^w/) || + ($extension eq "4" && + defined $qualifier && $qualifier !~ /^cc/)) { $bad_specifier = $specifier; last; }