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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 00B61C27C79 for ; Thu, 20 Jun 2024 16:43:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=x1r5R+hOmxGf9CtGbULnMlJbI64xhjSlMlPpHNZ7oU0=; b=FxgqeUFAxyUtBp0cm+FkdzKAq8 g5pXbAf8DkkbuwPmZlQPEVnPO0WUFJMQ5+HRVt3u5pULHklmRKR95jFnTtLRgfzTq0j+LkaE+xzDT 91xrJTBSYYB/VHUHqSbNERaQaIWn2Yp7yxU+RfNhA/KrLDhbt6PR2N63STMVFVFo+QK3Bf2Ajcvog R63fPleVSwbn1zM2Ta8L0OlpFsFJzCHv8Go5m2RoWZHD19JbK4LStCt3lz0Rio6qiuUb//RiZAdB5 dSSfM7HmE8OY5bQMEuMAdUNzIAYuVglLfW0Neeh2H3FCzf4TYQMFvLDlQDfiaoJRqutE4jhyHuZJN i+ZBrQvg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKKsV-00000005v8b-0Lfs; Thu, 20 Jun 2024 16:43:15 +0000 Received: from relay1-d.mail.gandi.net ([217.70.183.193]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKKsQ-00000005v5j-0GDP for linux-arm-kernel@lists.infradead.org; Thu, 20 Jun 2024 16:43:13 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 0664F240004; Thu, 20 Jun 2024 16:43:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1718901786; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=x1r5R+hOmxGf9CtGbULnMlJbI64xhjSlMlPpHNZ7oU0=; b=baZ76z4HxPN7Cb0wMGu5shQwCA1EPGa8J5KCt4JJfI/6E6eKEYZyYWUAjTvdK1ZSc/fIwZ Cvo5PN/HQ4TBhPLOZ50DayGeGzBlmWc0ZvRytoXUUbnGZHp773BtXhfpknjwvZujbov1Nu V8I+wNx3cPrr5h8Oq5S0cxRK7JcaaJUs63iaN15MY1vbym5zbXsonVXWBOq+Qn30t37Cbg Jf5+uhxpe5L2NTaQmCPYyfjni6lblCT6HPQSff5z4XkPi6rfjGL124Wa2cL/HEi7X9xxs4 suL31dAyDVFKpNT4B9B6JafAONKkFjBaqhFg6Ti2+kbBDdLTTaqWYcMzizNDZQ== Date: Thu, 20 Jun 2024 18:43:01 +0200 From: Herve Codina To: Andy Shevchenko Cc: Simon Horman , Sai Krishna Gajula , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Lee Jones , Arnd Bergmann , Horatiu Vultur , UNGLinuxDriver@microchip.com, Andrew Lunn , Heiner Kallweit , Russell King , Saravana Kannan , Bjorn Helgaas , Philipp Zabel , Lars Povlsen , Steen Hegelund , Daniel Machon , Alexandre Belloni , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Allan Nielsen , Luca Ceresoli , Thomas Petazzoni Subject: Re: [PATCH v2 18/19] mfd: Add support for LAN966x PCI device Message-ID: <20240620184301.2e768c02@bootlin.com> In-Reply-To: <20240620175646.24455efb@bootlin.com> References: <20240527161450.326615-1-herve.codina@bootlin.com> <20240527161450.326615-19-herve.codina@bootlin.com> <20240620175646.24455efb@bootlin.com> Organization: Bootlin X-Mailer: Claws Mail 4.2.0 (GTK 3.24.41; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-GND-Sasl: herve.codina@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240620_094310_497003_601D1016 X-CRM114-Status: GOOD ( 45.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org My bad, I wrongly answered first in private. -> Resend my answers with people in Cc Andy, I will also resend your reply. Sorry for this mistake. Herve On Thu, 20 Jun 2024 17:56:46 +0200 Herve Codina wrote: > Hi Andy, > > On Wed, 5 Jun 2024 23:24:43 +0300 > Andy Shevchenko wrote: > > > Mon, May 27, 2024 at 06:14:45PM +0200, Herve Codina kirjoitti: > > > Add a PCI driver that handles the LAN966x PCI device using a device-tree > > > overlay. This overlay is applied to the PCI device DT node and allows to > > > describe components that are present in the device. > > > > > > The memory from the device-tree is remapped to the BAR memory thanks to > > > "ranges" properties computed at runtime by the PCI core during the PCI > > > enumeration. > > > The PCI device itself acts as an interrupt controller and is used as the > > > parent of the internal LAN966x interrupt controller to route the > > > interrupts to the assigned PCI INTx interrupt. > > > > ... > > > > > +#include > > > +#include > > > > > +#include > > > > Why do you need this? > > > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > > General comment to the headers (in all your patches), try to follow IWYU > > principle, i.e. include what you use explicitly and don't use "proxy" headers > > such as kernel.h which basically shouldn't be used at all in the drivers. > > Sure, I will remove unneeded header inclusion. > > > > > ... > > > > > +static irqreturn_t pci_dev_irq_handler(int irq, void *data) > > > +{ > > > + struct pci_dev_intr_ctrl *intr_ctrl = data; > > > + int ret; > > > + > > > + ret = generic_handle_domain_irq(intr_ctrl->irq_domain, 0); > > > + return ret ? IRQ_NONE : IRQ_HANDLED; > > > > There is a macro for that IRQ_RETVAL() IIRC. > > Didn't known about that. Thanks for pointing out! > I will use it :) > > > > > > +} > > > > ... > > > > > +static int devm_pci_dev_create_intr_ctrl(struct pci_dev *pdev) > > > +{ > > > + struct pci_dev_intr_ctrl *intr_ctrl; > > > + > > > + intr_ctrl = pci_dev_create_intr_ctrl(pdev); > > > > > + > > > > Redundant blank line. > > Will be removed. > > > > > > + if (IS_ERR(intr_ctrl)) > > > + return PTR_ERR(intr_ctrl); > > > + > > > + return devm_add_action_or_reset(&pdev->dev, devm_pci_dev_remove_intr_ctrl, intr_ctrl); > > > +} > > > > ... > > > > > +static int lan966x_pci_load_overlay(struct lan966x_pci *data) > > > +{ > > > + u32 dtbo_size = __dtbo_lan966x_pci_end - __dtbo_lan966x_pci_begin; > > > + void *dtbo_start = __dtbo_lan966x_pci_begin; > > > + int ret; > > > + > > > + ret = of_overlay_fdt_apply(dtbo_start, dtbo_size, &data->ovcs_id, data->dev->of_node); > > > > dev_of_node() ? > > Yes indeed. > > > > > > + if (ret) > > > + return ret; > > > + > > > + return 0; > > > +} > > > > ... > > > > > +static int lan966x_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) > > > +{ > > > + struct device *dev = &pdev->dev; > > > + struct lan966x_pci *data; > > > + int ret; > > > > > + if (!dev->of_node) { > > > + dev_err(dev, "Missing of_node for device\n"); > > > + return -EINVAL; > > > + } > > > > Why do you need this? The code you have in _create_intr_ctrl() will take care > > already for this case. > > The code in _create_intr_ctrl checks for fwnode and not an of_node. > > The check here is to ensure that an of_node is available as it will be use > for DT overlay loading. > > I will keep the check here and use dev_of_node() instead of dev->of_node. > > > > > > + /* Need to be done before devm_pci_dev_create_intr_ctrl. > > > + * It allocates an IRQ and so pdev->irq is updated > > > > Missing period at the end. > > Will be added. > > > > > > + */ > > > + ret = pcim_enable_device(pdev); > > > + if (ret) > > > + return ret; > > > + > > > + ret = devm_pci_dev_create_intr_ctrl(pdev); > > > + if (ret) > > > + return ret; > > > + > > > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > > > + if (!data) > > > + return -ENOMEM; > > > + > > > + dev_set_drvdata(dev, data); > > > + data->dev = dev; > > > + data->pci_dev = pdev; > > > + > > > + ret = lan966x_pci_load_overlay(data); > > > + if (ret) > > > + return ret; > > > > > + pci_set_master(pdev); > > > > You don't use MSI, what is this for? > > DMA related. > Allows the PCI device to be master on the bus and so initiate transactions. > > Did I misunderstood ? > > > > > > + ret = of_platform_default_populate(dev->of_node, NULL, dev); > > > > dev_of_node() > > Yes, sure. > > > > > > + if (ret) > > > + goto err_unload_overlay; > > > + > > > + return 0; > > > + > > > +err_unload_overlay: > > > + lan966x_pci_unload_overlay(data); > > > + return ret; > > > +} > > > > ... > > > > > +static void lan966x_pci_remove(struct pci_dev *pdev) > > > +{ > > > + struct device *dev = &pdev->dev; > > > + struct lan966x_pci *data = dev_get_drvdata(dev); > > > > platform_get_drvdata() > > platform_get_drvdata() is related to platform_device. > There is no platform_device here but a pci_dev. > > I will use pci_get_drvdata() here and update probe() to > use pci_set_drvdata() for consistency. > > > > > > + of_platform_depopulate(dev); > > > + > > > + lan966x_pci_unload_overlay(data); > > > > > + pci_clear_master(pdev); > > > > No need to call this excplicitly when pcim_enable_device() was called. > > You're right. I will remove this call. > > > > > > +} > > > > ... > > > > > +static struct pci_device_id lan966x_pci_ids[] = { > > > + { PCI_DEVICE(0x1055, 0x9660) }, > > > > Don't you have VENDOR_ID defined somewhere? > > No and 0x1055 is taken by PCI_VENDOR_ID_EFAR in pci-ids.h > but SMSC acquired EFAR late 1990's and MCHP acquired SMSC in 2012 > https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/microchip/lan743x_main.h#L851 > > I will patch pci-ids.h to create: > #define PCI_VENDOR_ID_SMSC PCI_VENDOR_ID_EFAR > #define PCI_VENDOR_ID_MCHP PCI_VENDOR_ID_SMSC > As part of this patch, I will update lan743x_main.h to remove its own #define > > And use PCI_VENDOR_ID_MCHP in this series. > > > > > > + { 0, } > > > > Unneeded ' 0, ' part > > Will be removed. > > > > > > +}; > > > > Thanks a lot for your review. > > Best regards, > Hervé