From patchwork Thu Jan 9 19:45:29 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun R Murthy X-Patchwork-Id: 13933170 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A5E54E7719B for ; Thu, 9 Jan 2025 20:00:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0CE0D10EFA4; Thu, 9 Jan 2025 20:00:52 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="dttMi7M2"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) by gabe.freedesktop.org (Postfix) with ESMTPS id 56EC010EFA4; Thu, 9 Jan 2025 20:00:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1736452852; x=1767988852; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=xlpWJPaaUMWaNR0lC667XgbjZCYBsdCy7l/KnObWHTg=; b=dttMi7M2oeS5TW4uJmI6v2wSOO8CKRwMPwxrTF3ikDSV0r2TnPhLys5m f8HLPz2PMbyy9KgvsIffa5y7fCV4JYzANTsVbvubG5qhCqRq0UUPhPwad 2rUAcC+fdaT3dZQY+AV/WPMLTh6hwaUYh2yg3uHaMaDXDKdugfpNBwtsj NJeApanfNYMI2JP4z4XZ16nH0Arvo9daWZc+xcnqHjh4Sop8VRZEWXwAg Tp9Kmr02VoMkRJATdyTOSQEnIDJeYe52NMZIwZ3Azx8pxzsr7uPMOqqm8 SZkm0W2EuLGfrQsa0s+VJiHpBr1z8W6TWOsJGR/sZU2xiOWlDyCOe6sqG A==; X-CSE-ConnectionGUID: i/UhoOr2TbSOh/cicLiCiA== X-CSE-MsgGUID: L152n3rySn64rDwc8ulqQQ== X-IronPort-AV: E=McAfee;i="6700,10204,11310"; a="36619174" X-IronPort-AV: E=Sophos;i="6.12,302,1728975600"; d="scan'208";a="36619174" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jan 2025 12:00:51 -0800 X-CSE-ConnectionGUID: dK8U8YxSRGW/VU/uM9fvAQ== X-CSE-MsgGUID: LGX0yJk2TFK5Co0QKZ55tw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="126798565" Received: from srr4-3-linux-106-armuthy.iind.intel.com ([10.190.238.56]) by fmviesa002.fm.intel.com with ESMTP; 09 Jan 2025 12:00:48 -0800 From: Arun R Murthy Date: Fri, 10 Jan 2025 01:15:29 +0530 Subject: [PATCH v7 01/14] drm: Define histogram structures exposed to user MIME-Version: 1.0 Message-Id: <20250110-dpst-v7-1-605cb0271162@intel.com> References: <20250110-dpst-v7-0-605cb0271162@intel.com> In-Reply-To: <20250110-dpst-v7-0-605cb0271162@intel.com> To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: dmitry.baryshkov@linaro.org, suraj.kandpal@intel.com, uma.shankar@intel.com, "Imported from f20241218-dpst-v7-0-81bfe7d08c2d"@intel.com, 20240705091333.328322-1-mohammed.thasleem@intel.com, Arun R Murthy X-Mailer: b4 0.15-dev 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Display Histogram is an array of bins and can be generated in many ways referred to as modes. Ex: HSV max(RGB), Wighted RGB etc. Understanding the histogram data format(Ex: HSV max(RGB)) Histogram is just the pixel count. For a maximum resolution of 10k (10240 x 4320 = 44236800) 25 bits should be sufficient to represent this along with a buffer of 7 bits(future use) u32 is being considered. max(RGB) can be 255 i.e 0xFF 8 bit, considering the most significant 5 bits, hence 32 bins. Below mentioned algorithm illustrates the histogram generation in hardware. hist[32] = {0}; for (i = 0; i < resolution; i++) { bin = max(RGB[i]); bin = bin >> 3; /* consider the most significant bits */ hist[bin]++; } If the entire image is Red color then max(255,0,0) is 255 so the pixel count of each pixels will be placed in the last bin. Hence except hist[31] all other bins will have a value zero. Generated histogram in this case would be hist[32] = {0,0,....44236800} Description of the structures, properties defined are documented in the header file include/uapi/drm/drm_mode.h Signed-off-by: Arun R Murthy --- include/uapi/drm/drm_mode.h | 59 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index c082810c08a8b234ef2672ecf54fc8c05ddc2bd3..7a7039381142bb5dba269bdaec42c18be34e2d05 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -1355,6 +1355,65 @@ struct drm_mode_closefb { __u32 pad; }; +/* + * Maximum resolution at present 10k, 10240x4320 = 44236800 + * can be denoted in 25bits. With an additional 7 bits in buffer each bin + * can be a u32 value. + * Maximum value of max(RGB) is 255, so max 255 bins. + * If the most significant 5 bits are considered, then bins = 0xff >> 3 + * will be 32 bins. + * For illustration consider a full RED image of 10k resolution considering all + * 8 bits histogram would look like hist[255] = {0,0,....44236800} + */ +#define DRM_MODE_HISTOGRAM_HSV_MAX_RGB (1 << 0) + +/** + * struct drm_histogram_caps + * + * @histogram_mode: histogram generation modes, defined in the above macros + * @bins_count: number of bins for a chosen histogram mode. For illustration + * refer the above defined histogram mode. + */ +struct drm_histogram_caps { + u8 histogram_mode; + u32 bins_count; +}; + +/** + * struct drm_histogram_config + * + * @enable: flag to enable/disable histogram + * @hist_mode: histogram mode(HSV max(RGB), RGB, LUMA etc) + * @reserved1: Reserved for future use + * @reserved2: Reserved for future use + * @reserved3: Reserved for future use + * @reserved4: Reserved for future use + */ +struct drm_histogram_config { + bool enable; + u8 hist_mode; + u32 reserved1; + u32 reserved2; + u32 reserved3; + u32 reserved4; +}; + +/** + * struct drm_histogram + * + * @config: histogram configuration data pointed by struct drm_histogram_config + * @data_ptr: pointer to the array of histogram. + * Histogram is an array of bins. Data format for each bin depends + * on the histogram mode. Refer to the above histogram modes for + * more information. + * @nr_elements: number of bins in the histogram. + */ +struct drm_histogram { + struct drm_histogram_config config; + __u64 data_ptr; + __u32 nr_elements; +}; + #if defined(__cplusplus) } #endif