From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54219C2BA4C for ; Wed, 26 Jan 2022 20:36:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231143AbiAZUge (ORCPT ); Wed, 26 Jan 2022 15:36:34 -0500 Received: from mga01.intel.com ([192.55.52.88]:9978 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230445AbiAZUgd (ORCPT ); Wed, 26 Jan 2022 15:36:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643229393; x=1674765393; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=SxwOX/KvCGehbJ+xk/iHXJSG5hnovWhcQo3g+1qN37Y=; b=WC7NUtdnxNVdLcWb1f7x4KJF5Y0NqAjWMrRM/QGSDI7LUN40RJh0CQmg Ep4wi2/ELFEQM45qAjSirGuDqoz101FIAE8DfANgXvJbZaeHsf/zVxRqV wRpjlz6VccdreEAVMGctYQBTLOlzO1o8N2prclFxUH9UH9Xaa5i0Qd1i6 WIsuEXlzcQ+M4fMCtusCyDS4k7YyUjdOB/0OLP+tywQVk16eM7nfE0qAx DqoEtffsKrFYtcAQQzb1y01RKMgo2oiMW8JmnFRW4k07/LHC3N4r45MaX pEahCObxn2IJxhSZZ/qMIyoG225iZsUxYlaGZEgX8fUeDfGDkKRxuWdbn Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10239"; a="271098466" X-IronPort-AV: E=Sophos;i="5.88,319,1635231600"; d="scan'208";a="271098466" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2022 12:36:22 -0800 X-IronPort-AV: E=Sophos;i="5.88,319,1635231600"; d="scan'208";a="581221493" Received: from lucas-s2600cw.jf.intel.com ([10.165.21.202]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2022 12:36:22 -0800 From: Lucas De Marchi To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, Matt Roper , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH 02/19] dma-buf-map: Add helper to initialize second map Date: Wed, 26 Jan 2022 12:36:45 -0800 Message-Id: <20220126203702.1784589-3-lucas.demarchi@intel.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20220126203702.1784589-1-lucas.demarchi@intel.com> References: <20220126203702.1784589-1-lucas.demarchi@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org When dma_buf_map struct is passed around, it's useful to be able to initialize a second map that takes care of reading/writing to an offset of the original map. Add a helper that copies the struct and add the offset to the proper address. Cc: Sumit Semwal Cc: Christian König Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linaro-mm-sig@lists.linaro.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Lucas De Marchi --- include/linux/dma-buf-map.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h index 65e927d9ce33..3514a859f628 100644 --- a/include/linux/dma-buf-map.h +++ b/include/linux/dma-buf-map.h @@ -131,6 +131,35 @@ struct dma_buf_map { .is_iomem = false, \ } +/** + * DMA_BUF_MAP_INIT_OFFSET - Initializes struct dma_buf_map from another dma_buf_map + * @map_: The dma-buf mapping structure to copy from + * @offset: Offset to add to the other mapping + * + * Initializes a new dma_buf_struct based on another. This is the equivalent of doing: + * + * .. code-block: c + * + * dma_buf_map map = other_map; + * dma_buf_map_incr(&map, &offset); + * + * Example usage: + * + * .. code-block: c + * + * void foo(struct device *dev, struct dma_buf_map *base_map) + * { + * ... + * struct dma_buf_map = DMA_BUF_MAP_INIT_OFFSET(base_map, FIELD_OFFSET); + * ... + * } + */ +#define DMA_BUF_MAP_INIT_OFFSET(map_, offset_) (struct dma_buf_map) \ + { \ + .vaddr = (map_)->vaddr + (offset_), \ + .is_iomem = (map_)->is_iomem, \ + } + /** * dma_buf_map_set_vaddr - Sets a dma-buf mapping structure to an address in system memory * @map: The dma-buf mapping structure -- 2.35.0