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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 3E494C4320A for ; Tue, 10 Aug 2021 10:25:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25F7C61029 for ; Tue, 10 Aug 2021 10:25:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231247AbhHJKZx (ORCPT ); Tue, 10 Aug 2021 06:25:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbhHJKZs (ORCPT ); Tue, 10 Aug 2021 06:25:48 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0205C061798 for ; Tue, 10 Aug 2021 03:25:26 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id w13-20020a17090aea0db029017897a5f7bcso4541169pjy.5 for ; Tue, 10 Aug 2021 03:25:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ZdCiYC9u4FnuS70bUd9/octYWkdJG1zK6Pj5AbL4FKs=; b=cQctpUWGgS8XavHH49A7V07HpxQh3UZrgT0rpm6Xo7pjORT+h6V/gpJmAk/K9q82l0 BXpx2fSycKX07osBbPOk/myawlvQA2W1M+F/f8oOsBLdfuRqo6JaTriVSznwdhJadbrP 2kKOFPWUDPXnGnLFu5FFweje7fwSYSsPE36n/iipqP85ti4NnpCTiS+XjRlVk1MFh/nE Bfno9U2KlR96Faike7CAHkTU3WBSWpIlTIaEY9yC7TQ4/ZJvYmj0aashV0IlkVQFkRi2 JFkacqTJxlS3oqGOYl77XZRvrIPSD6kp9q20EvRFTryUlmnBhYmsbKQadXdFz8Cur9No 0ccw== 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:mime-version :content-transfer-encoding; bh=ZdCiYC9u4FnuS70bUd9/octYWkdJG1zK6Pj5AbL4FKs=; b=nSS9Tj/aMwITA1/U/nut7/JBxpNeygb0LqDZmJuu88SxaWg4pUpsh2BcioVNDBJQfB borXnm+S+N6PyhY3x3MT2gU8VG7/ti4voW09bMjLe/+LfO5Krbswrtvjpe8PBELfkvwQ oUnpOJheDGAzl9VzqpDtdN5FxIcD70bG+hZRw7QwwHkaPWORc8/MdrGKJtk4hP2rw1FD ODxuJKz3TGmMTRmPhXxo8zGGIGzv9bFKYYPx5i9fou8FVw2yer1O1eSUu9tMU/3bryOg R/ow41l1JXOOdIdTWQ8T8kM097OezSt3fB619LVMDBIFWyrshFVF9b/izyqmxKk+lpGW lKLQ== X-Gm-Message-State: AOAM533UTGp9CQFpgCrcOfrAmhaVOcoGvLKKs8MPQO1Xw94ViR0LtmGU EWz4Z5n4M6hkyppBdpZ/XShuoA== X-Google-Smtp-Source: ABdhPJwfe8truRga+QTqCjf8OWZq0lELLcSbl5CksIhnr3YftGvX2WA1G7Yb3PcGGaa9QKuM2Hs74w== X-Received: by 2002:a65:450c:: with SMTP id n12mr312121pgq.316.1628591126406; Tue, 10 Aug 2021 03:25:26 -0700 (PDT) Received: from localhost ([122.172.201.85]) by smtp.gmail.com with ESMTPSA id a11sm27981920pgj.75.2021.08.10.03.25.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Aug 2021 03:25:25 -0700 (PDT) From: Viresh Kumar To: Arnd Bergmann , Linus Walleij , Bartosz Golaszewski , "Enrico Weigelt, metux IT consult" , Jason Wang , "Michael S. Tsirkin" , Viresh Kumar Cc: Viresh Kumar , Vincent Guittot , Jean-Philippe Brucker , Bill Mills , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Cornelia Huck , Geert Uytterhoeven , stratos-dev@op-lists.linaro.org, linux-kernel@vger.kernel.org, Thomas Gleixner , Marc Zyngier , linux-gpio@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH V5 0/2] gpio: Add virtio based driver Date: Tue, 10 Aug 2021 15:55:14 +0530 Message-Id: X-Mailer: git-send-email 2.31.1.272.g89b43f80a514 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, This adds Virtio GPIO driver based on the proposed specification [1]. The specification for basic GPIO operations is already reviewed by Linus and Arnd, while the IRQ stuff is still under discussion and not finalized. I am sharing the code, so everyone gets more clarity on how it will work eventually in Linux. I have tested this patchset with Qemu guest with help of the libgpiod utility. I have also tested basic handling of interrupts on the guest side. It works as expected. The host side virtio-backend isn't ready yet and my tests only tested the flow control between guest and host, but didn't play with real GPIO pins. That will be done once I have a working backend in place (WIP). V4->V5: - Use ____cacheline_aligned for buffers. - Proper locking in place, which avoids the use of work-item for processing interrupts. - Separate callbacks for enable/disable of irqs. - The irq is disabled at the host only for enable/disable now, instead of mask/unmask. - mask/unmask only control the queuing of buffers now. - Use handle_level_irq() instead of handle_fasteoi_irq(). - Other minor changes. V3->V4: - Lots of changes, as the specification changed too much. Better forget everything we have done until now :) -- Viresh [1] https://lists.oasis-open.org/archives/virtio-dev/202107/msg00232.html Viresh Kumar (2): gpio: Add virtio-gpio driver gpio: virtio: Add IRQ support MAINTAINERS | 7 + drivers/gpio/Kconfig | 10 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-virtio.c | 668 +++++++++++++++++++++++++++++++ include/uapi/linux/virtio_gpio.h | 72 ++++ 5 files changed, 758 insertions(+) create mode 100644 drivers/gpio/gpio-virtio.c create mode 100644 include/uapi/linux/virtio_gpio.h -- 2.31.1.272.g89b43f80a514