From patchwork Thu Nov 12 15:54:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ioana Ciornei X-Patchwork-Id: 1399075 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=Gs8ocfeI; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CX5tj3P0nz9s0b for ; Fri, 13 Nov 2020 03:01:17 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728783AbgKLP6S (ORCPT ); Thu, 12 Nov 2020 10:58:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728758AbgKLP6R (ORCPT ); Thu, 12 Nov 2020 10:58:17 -0500 Received: from mail-ed1-x543.google.com (mail-ed1-x543.google.com [IPv6:2a00:1450:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBEB3C0613D1; Thu, 12 Nov 2020 07:58:16 -0800 (PST) Received: by mail-ed1-x543.google.com with SMTP id t11so6806798edj.13; Thu, 12 Nov 2020 07:58:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=IKZ0bJ9wrwGZuyOlCMns8U747V5thrsJagTuvXdjRs0=; b=Gs8ocfeIX5ONLTW9ozPMdd5HxbyWWOMRw0clObL+hMWt9zjgrj+mqHC3l0hDF/ihpR DJUWlmAB55Um9PVdhFg6BxBQwLnccJ6gvQCEvmmc7rwXDC9yBI7Rw16wZFFL5crH7axI td1JPfk8bXScK0WJiOapCmD654WwYW/B0rwOC66G4hlHN1KeIboP+ly9kS4gu6hqaZYr h+3EsBMudz0I8+DXsbmN9zakoT4Uc457QjDZmdGGftqsknUGE9hj2pPkKVK3wAqnhPE9 7cCgqVjah66y8F3wsvSrDbZq6Jbmq6u4mwna8NROEOYrXyONvZvfsU1plBBlKxZCpmot 4nsg== 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=IKZ0bJ9wrwGZuyOlCMns8U747V5thrsJagTuvXdjRs0=; b=bkLFeJwutvx6rbiCzT9eHMDknjyTul94x6z+iSTwYkB+6LLwYheUH+D/A0570VImTU U5f02IKxPPtFFLDDg5uWoqJZGCwag/fq0Y7NwxXkxxF3aStPZCkMRF4unttob0PtN/pA ycMckC3NIHu/OFf6Y4VbWWeJ7t35wlevLvyTEwxv/dYyFd2LOKhUvlXX3rLA8BqUXj3F cpu/wj0/U0csqZn32trW/1btrXoyjsxxNgu7u1XXLy9u+rGIoKM9Iq8baH2lOFya6YWl io2NfqidpiO6nKgTyEJv2Md/WLnZcBEtNNIyobWflLhv+5FeHjNMW3mKE7UajxH/Nj6D UBAA== X-Gm-Message-State: AOAM530JTnYQvZGXSx0cREF5NED8ZA3AntPJ3VkIz3EMj1yrd7VCcMY7 ugZlzwAAZQ9BcqxOwpPCx4I= X-Google-Smtp-Source: ABdhPJy2UZAtvuJnRjXYWNnt+bVbjdvt647JwfqbQixYhwXBCSp3DqML+BXBoswntePYKr4UYLkqDA== X-Received: by 2002:a50:d784:: with SMTP id w4mr391175edi.201.1605196695371; Thu, 12 Nov 2020 07:58:15 -0800 (PST) Received: from yoga-910.localhost ([188.25.2.177]) by smtp.gmail.com with ESMTPSA id q15sm2546540edt.95.2020.11.12.07.58.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2020 07:58:14 -0800 (PST) From: Ioana Ciornei To: Andrew Lunn , Heiner Kallweit , Russell King , Florian Fainelli , Jakub Kicinski , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ioana Ciornei , Alexandru Ardelean , Andre Edich , Baruch Siach , Christophe Leroy , Kavya Sree Kotagiri , Linus Walleij , Marco Felsch , Marek Vasut , Maxim Kochetkov , Nisar Sayed , Oleksij Rempel , Robert Hancock , Yuiko Oshino Subject: [PATCH net-next 00/18] net: phy: add support for shared interrupts (part 2) Date: Thu, 12 Nov 2020 17:54:55 +0200 Message-Id: <20201112155513.411604-1-ciorneiioana@gmail.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Ioana Ciornei This patch set aims to actually add support for shared interrupts in phylib and not only for multi-PHY devices. While we are at it, streamline the interrupt handling in phylib. For a bit of context, at the moment, there are multiple phy_driver ops that deal with this subject: - .config_intr() - Enable/disable the interrupt line. - .ack_interrupt() - Should quiesce any interrupts that may have been fired. It's also used by phylib in conjunction with .config_intr() to clear any pending interrupts after the line was disabled, and before it is going to be enabled. - .did_interrupt() - Intended for multi-PHY devices with a shared IRQ line and used by phylib to discern which PHY from the package was the one that actually fired the interrupt. - .handle_interrupt() - Completely overrides the default interrupt handling logic from phylib. The PHY driver is responsible for checking if any interrupt was fired by the respective PHY and choose accordingly if it's the one that should trigger the link state machine. From my point of view, the interrupt handling in phylib has become somewhat confusing with all these callbacks that actually read the same PHY register - the interrupt status. A more streamlined approach would be to just move the responsibility to write an interrupt handler to the driver (as any other device driver does) and make .handle_interrupt() the only way to deal with interrupts. Another advantage with this approach would be that phylib would gain support for shared IRQs between different PHY (not just multi-PHY devices), something which at the moment would require extending every PHY driver anyway in order to implement their .did_interrupt() callback and duplicate the same logic as in .ack_interrupt(). The disadvantage of making .did_interrupt() mandatory would be that we are slightly changing the semantics of the phylib API and that would increase confusion instead of reducing it. What I am proposing is the following: - As a first step, make the .ack_interrupt() callback optional so that we do not break any PHY driver amid the transition. - Every PHY driver gains a .handle_interrupt() implementation that, for the most part, would look like below: irq_status = phy_read(phydev, INTR_STATUS); if (irq_status < 0) { phy_error(phydev); return IRQ_NONE; } if (!(irq_status & irq_mask)) return IRQ_NONE; phy_trigger_machine(phydev); return IRQ_HANDLED; - Remove each PHY driver's implementation of the .ack_interrupt() by actually taking care of quiescing any pending interrupts before enabling/after disabling the interrupt line. - Finally, after all drivers have been ported, remove the .ack_interrupt() and .did_interrupt() callbacks from phy_driver. This patch set is part 2 of the entire change set and it addresses the changes needed in 9 PHY drivers. The rest can be found on my Github branch here: https://github.com/IoanaCiornei/linux/commits/phylib-shared-irq I do not have access to most of these PHY's, therefore I Cc-ed the latest contributors to the individual PHY drivers in order to have access, hopefully, to more regression testing. Ioana Ciornei (18): net: phy: vitesse: implement generic .handle_interrupt() callback net: phy: vitesse: remove the use of .ack_interrupt() net: phy: microchip: implement generic .handle_interrupt() callback net: phy: microchip: remove the use of .ack_interrupt() net: phy: marvell: implement generic .handle_interrupt() callback net: phy: marvell: remove the use of .ack_interrupt() net: phy: lxt: implement generic .handle_interrupt() callback net: phy: lxt: remove the use of .ack_interrupt() net: phy: nxp-tja11xx: implement generic .handle_interrupt() callback net: phy: nxp-tja11xx: remove the use of .ack_interrupt() net: phy: amd: implement generic .handle_interrupt() callback net: phy: amd: remove the use of .ack_interrupt() net: phy: smsc: implement generic .handle_interrupt() callback net: phy: smsc: remove the use of .ack_interrupt() net: phy: ste10Xp: implement generic .handle_interrupt() callback net: phy: ste10Xp: remove the use of .ack_interrupt() net: phy: adin: implement generic .handle_interrupt() callback net: phy: adin: remove the use of the .ack_interrupt() drivers/net/phy/adin.c | 45 +++++++++++++--- drivers/net/phy/amd.c | 37 +++++++++++-- drivers/net/phy/lxt.c | 94 ++++++++++++++++++++++++++++++---- drivers/net/phy/marvell.c | 88 ++++++++++++++++--------------- drivers/net/phy/microchip.c | 24 +++++++-- drivers/net/phy/microchip_t1.c | 28 +++++++--- drivers/net/phy/nxp-tja11xx.c | 42 +++++++++++++-- drivers/net/phy/smsc.c | 55 ++++++++++++++++---- drivers/net/phy/ste10Xp.c | 53 +++++++++++++------ drivers/net/phy/vitesse.c | 61 ++++++++++++++-------- 10 files changed, 405 insertions(+), 122 deletions(-) Cc: Alexandru Ardelean Cc: Andre Edich Cc: Baruch Siach Cc: Christophe Leroy Cc: Kavya Sree Kotagiri Cc: Linus Walleij Cc: Marco Felsch Cc: Marek Vasut Cc: Maxim Kochetkov Cc: Nisar Sayed Cc: Oleksij Rempel Cc: Robert Hancock Cc: Yuiko Oshino