From patchwork Tue Jun 21 15:38:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Bornyakov X-Patchwork-Id: 12889430 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 5FC4AC433EF for ; Tue, 21 Jun 2022 15:41:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352986AbiFUPkN (ORCPT ); Tue, 21 Jun 2022 11:40:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352872AbiFUPkI (ORCPT ); Tue, 21 Jun 2022 11:40:08 -0400 Received: from mail.pr-group.ru (mail.pr-group.ru [178.18.215.3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCD192B27A; Tue, 21 Jun 2022 08:40:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=metrotek.ru; s=mail; h=from:subject:date:message-id:to:cc:mime-version:content-transfer-encoding: in-reply-to:references; bh=fQ1LJQiXr+TiDxrauFEmM46nhJQd4SDVvYPYRlBCkhk=; b=EmwXmrJvuC0kOfgAsotm7i9zOnuJfAeE8Km1NAbYvhbsReYq+vUFiUU+rrYezl7Z1I8tzGZEpdoB6 344WVNq82bqK7CSJ+Ja95ixK1sAIySNsgki4Z7Ovtk9oVFSnjSohb6H/DdzsWD9ZJUKv7EAhiAOmYN 6DsiNWgCv+NzKN59ZZkWLuJt6+9p59aabJepKLJuPN4BTY9e7LGdLm/kUUQHaEBxXbGyKXBqbfjGKy FZwRp7sPY7mUizeHCBD4J9Ggf5WeuLfcfwWhtcigC/1I4FZhE92SjNqeZCL3uM1fv5po8sBaWYRWl4 bWw+tldoNrVUfk0cAmQGDpuyWPwbvjQ== X-Kerio-Anti-Spam: Build: [Engines: 2.16.3.1424, Stamp: 3], Multi: [Enabled, t: (0.000009,0.011149)], BW: [Enabled, t: (0.000014,0.000001)], RTDA: [Enabled, t: (0.081571), Hit: No, Details: v2.40.0; Id: 15.52k02u.1g63emrlh.6fvp; mclb], total: 0(700) X-Footer: bWV0cm90ZWsucnU= Received: from h-e2.ddg ([85.143.252.66]) (authenticated user i.bornyakov@metrotek.ru) by mail.pr-group.ru with ESMTPSA (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)); Tue, 21 Jun 2022 18:39:44 +0300 From: Ivan Bornyakov To: mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, corbet@lwn.net Cc: Ivan Bornyakov , conor.dooley@microchip.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, system@metrotek.ru Subject: [PATCH v21 2/5] docs: fpga: mgr: document parse_header() callback Date: Tue, 21 Jun 2022 18:38:44 +0300 Message-Id: <20220621153847.103052-3-i.bornyakov@metrotek.ru> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220621153847.103052-1-i.bornyakov@metrotek.ru> References: <20220621153847.103052-1-i.bornyakov@metrotek.ru> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Document newly introduced fpga_manager_ops callback parse_header() and flag skip_header along with header_size and data_size fields of struct fpga_image_info. Signed-off-by: Ivan Bornyakov Acked-by: Xu Yilun --- Documentation/driver-api/fpga/fpga-mgr.rst | 27 +++++++++++++++++----- 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/Documentation/driver-api/fpga/fpga-mgr.rst b/Documentation/driver-api/fpga/fpga-mgr.rst index 42c01f396dce..49c0a9512653 100644 --- a/Documentation/driver-api/fpga/fpga-mgr.rst +++ b/Documentation/driver-api/fpga/fpga-mgr.rst @@ -79,12 +79,27 @@ do the programming sequence for this particular FPGA. These ops return 0 for success or negative error codes otherwise. The programming sequence is:: - 1. .write_init - 2. .write or .write_sg (may be called once or multiple times) - 3. .write_complete - -The .write_init function will prepare the FPGA to receive the image data. The -buffer passed into .write_init will be at most .initial_header_size bytes long; + 1. .parse_header (optional, may be called once or multiple times) + 2. .write_init + 3. .write or .write_sg (may be called once or multiple times) + 4. .write_complete + +The .parse_header function will set header_size and data_size to +struct fpga_image_info. Before parse_header call, header_size is initialized +with initial_header_size. If flag skip_header of fpga_manager_ops is true, +.write function will get image buffer starting at header_size offset from the +beginning. If data_size is set, .write function will get data_size bytes of +the image buffer, otherwise .write will get data up to the end of image buffer. +This will not affect .write_sg, .write_sg will still get whole image in +sg_table form. If FPGA image is already mapped as a single contiguous buffer, +whole buffer will be passed into .parse_header. If image is in scatter-gather +form, core code will buffer up at least .initial_header_size before the first +call of .parse_header, if it is not enough, .parse_header should set desired +size into info->header_size and return -EAGAIN, then it will be called again +with greater part of image buffer on the input. + +The .write_init function will prepare the FPGA to receive the image data. The +buffer passed into .write_init will be at least info->header_size bytes long; if the whole bitstream is not immediately available then the core code will buffer up at least this much before starting.