From patchwork Thu Jun 13 11:50:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 1947362 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=bWlAy/pe; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=147.75.80.249; helo=am.mirrors.kernel.org; envelope-from=linux-pci+bounces-8728-incoming=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from am.mirrors.kernel.org (am.mirrors.kernel.org [147.75.80.249]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4W0LV20gRLz1ydW for ; Thu, 13 Jun 2024 21:56:26 +1000 (AEST) Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id 7B53D1F268C4 for ; Thu, 13 Jun 2024 11:56:23 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 02387145A14; Thu, 13 Jun 2024 11:51:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bWlAy/pe" X-Original-To: linux-pci@vger.kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 195B7149011 for ; Thu, 13 Jun 2024 11:51:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718279462; cv=none; b=Y6g0+xozB58VeitySD28VnoseO715OmHUH/d6V1HoK7KCgJdGK2ff9MSPFEWdamlnokPP46yBJoQMzd4Th6klEsJpRRQJrGaWG4v0cHFru8spkVojDrXJ/bW6g+uTypLvnNUatVCtbHE0hkSR2FUUNSmPKBQsF0TbrpkorYAYp0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718279462; c=relaxed/simple; bh=mgYu+PdBk2Uxe11LPVB6MI3T1q9XfYavbWG7yJM+v24=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AeJ/KyjjjHVmW1u+g6joE6hnr9rDvSiR7AsTXPOQ4YxDkY9ToqJi7m0XHHglpJiN//zAZ24myKcjCtVn8wtqFC421FY7Bz97PDqxDSPdo0n2BXrXUSIGkR9BcEqxFEt/qMhx64N6H1GoVkbZV7rwk0awiBuN1T3ozRkdA0kKrtI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bWlAy/pe; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1718279460; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UXtJP09mnY/VoBFabkO3D30y5UZGrDuagfM4gYTmfUM=; b=bWlAy/peIAtgXU0jJ6x2w36K00YFLpILrChPW47Mx7uOGGTQoPs0Mkdrl0R4CTEauTQmhu sNMgfHOlsDIMK4Je26yc9ja6zClvvRBVOMcKH/mlAL8rjbnfRw9/FSF3RTbRE99TUrVSQ6 QH851d/rfGoYtw6gv77QP0WBe5ZKnn0= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-539-Byc60YzEP8q7kuk2auIaOQ-1; Thu, 13 Jun 2024 07:50:56 -0400 X-MC-Unique: Byc60YzEP8q7kuk2auIaOQ-1 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-42183fdb22bso1602495e9.1 for ; Thu, 13 Jun 2024 04:50:56 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718279456; x=1718884256; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UXtJP09mnY/VoBFabkO3D30y5UZGrDuagfM4gYTmfUM=; b=C38djLX0ijrna8i0NfMUQcih+M0sY3eP1PsssciegHdnsNwD28XXAxc/44b8I+sM5T XLd/9iwvsy1A3r3mOH17P0HlgPHvwzOK4pqu63jTm4EPQ2+2HvsJPT99qVedZYFxDbFk O3BSTyfqMdAFIpk3OoW9a6RZtui+Z06KpeZiu4QlTj5VwqCC0A2izbO+fTxftZRPgUpU uqb2L/pTXflbIanIEKhbZRET+/o1mlSmpXq8/E1EFJ27kfjlcet2nc35IIQ6d5YpWDP7 NlPkFA2X2RNJ9A7xQVKf29YwtYt99CYp81R0GZWQJca5H/0MAZFGg9nG3fTGNfZOYBPS GIzA== X-Forwarded-Encrypted: i=1; AJvYcCWFFH55hKmFVl9DPV8hmvvYTzrp1BpsNmF7hlvWjiEO1TX/PnpDdDQ2wkQKgXjJhvtEHqI9Xn5VkzYMwQc47WDoc3Y9IhQ/8t0U X-Gm-Message-State: AOJu0Yw/t3MKt7IKu2w6tRP5MlxMONgPqb+RR05DbGqFIq/1YcBIT+9I gGUpFjLhS8J5LtmQpD61uepd3xv6uD8uTeV8Pd7sah6+2T/foO2pdwDwA4J/UW1mNMrqCQh3OJP 0u0qlNPY8ft0R1UKd+BYOBQx2EWi0u0WRmi68SU90Nyq8hRd4yYsXD03PEw== X-Received: by 2002:a05:6000:1aca:b0:35f:305d:d2c8 with SMTP id ffacd0b85a97d-36079a4c065mr196888f8f.3.1718279455710; Thu, 13 Jun 2024 04:50:55 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFg6sk3xnm8Dx/Hnr1TCgUs2mRnf7/ulhG/8nI0xWi/V2RpnZJUye6zcNtI5u+FrxW/ybB/fw== X-Received: by 2002:a05:6000:1aca:b0:35f:305d:d2c8 with SMTP id ffacd0b85a97d-36079a4c065mr196879f8f.3.1718279455407; Thu, 13 Jun 2024 04:50:55 -0700 (PDT) Received: from pstanner-thinkpadt14sgen1.remote.csb (nat-pool-muc-t.redhat.com. [149.14.88.26]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3607509c883sm1510620f8f.29.2024.06.13.04.50.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jun 2024 04:50:55 -0700 (PDT) From: Philipp Stanner To: Hans de Goede , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Bjorn Helgaas , Sam Ravnborg , dakr@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Philipp Stanner Subject: [PATCH v9 10/13] PCI: Give pci_intx() its own devres callback Date: Thu, 13 Jun 2024 13:50:23 +0200 Message-ID: <20240613115032.29098-11-pstanner@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240613115032.29098-1-pstanner@redhat.com> References: <20240613115032.29098-1-pstanner@redhat.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 pci_intx() is one of the functions that have "hybrid mode" (i.e., sometimes managed, sometimes not). Providing a separate pcim_intx() function with its own device resource and cleanup callback allows for removing further large parts of the legacy PCI devres implementation. As in the region-request-functions, pci_intx() has to call into its managed counterpart for backwards compatibility. As pci_intx() is an outdated function, pcim_intx() shall not be made visible to drivers via a public API. Implement pcim_intx() with its own device resource. Make pci_intx() call pcim_intx() in the managed case. Remove the now surplus function find_pci_dr(). Signed-off-by: Philipp Stanner Reported-by: Ashish Kalra Signed-off-by: Philipp Stanner Tested-by: Ashish Kalra --- drivers/pci/devres.c | 76 ++++++++++++++++++++++++++++++++++++-------- drivers/pci/pci.c | 21 ++++++------ drivers/pci/pci.h | 13 ++++---- 3 files changed, 80 insertions(+), 30 deletions(-) diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c index e8de93e95eb6..7b72c952a9e5 100644 --- a/drivers/pci/devres.c +++ b/drivers/pci/devres.c @@ -42,6 +42,11 @@ struct pcim_iomap_devres { void __iomem *table[PCI_STD_NUM_BARS]; }; +/* Used to restore the old intx state on driver detach. */ +struct pcim_intx_devres { + int orig_intx; +}; + enum pcim_addr_devres_type { /* Default initializer. */ PCIM_ADDR_DEVRES_TYPE_INVALID, @@ -397,32 +402,75 @@ int pcim_set_mwi(struct pci_dev *pdev) } EXPORT_SYMBOL(pcim_set_mwi); + static inline bool mask_contains_bar(int mask, int bar) { return mask & BIT(bar); } -static void pcim_release(struct device *gendev, void *res) +static void pcim_intx_restore(struct device *dev, void *data) { - struct pci_dev *dev = to_pci_dev(gendev); - struct pci_devres *this = res; + struct pci_dev *pdev = to_pci_dev(dev); + struct pcim_intx_devres *res = data; - if (this->restore_intx) - pci_intx(dev, this->orig_intx); + pci_intx(pdev, res->orig_intx); +} - if (pci_is_enabled(dev) && !dev->pinned) - pci_disable_device(dev); +static struct pcim_intx_devres *get_or_create_intx_devres(struct device *dev) +{ + struct pcim_intx_devres *res; + + res = devres_find(dev, pcim_intx_restore, NULL, NULL); + if (res) + return res; + + res = devres_alloc(pcim_intx_restore, sizeof(*res), GFP_KERNEL); + if (res) + devres_add(dev, res); + + return res; } -/* - * TODO: After the last four callers in pci.c are ported, find_pci_dr() - * needs to be made static again. +/** + * pcim_intx - managed pci_intx() + * @pdev: the PCI device to operate on + * @enable: boolean: whether to enable or disable PCI INTx + * + * Returns: 0 on success, -ENOMEM on error. + * + * Enables/disables PCI INTx for device @pdev. + * Restores the original state on driver detach. */ -struct pci_devres *find_pci_dr(struct pci_dev *pdev) +int pcim_intx(struct pci_dev *pdev, int enable) { - if (pci_is_managed(pdev)) - return devres_find(&pdev->dev, pcim_release, NULL, NULL); - return NULL; + u16 pci_command, new; + struct pcim_intx_devres *res; + + res = get_or_create_intx_devres(&pdev->dev); + if (!res) + return -ENOMEM; + + res->orig_intx = !enable; + + pci_read_config_word(pdev, PCI_COMMAND, &pci_command); + + if (enable) + new = pci_command & ~PCI_COMMAND_INTX_DISABLE; + else + new = pci_command | PCI_COMMAND_INTX_DISABLE; + + if (new != pci_command) + pci_write_config_word(pdev, PCI_COMMAND, new); + + return 0; +} + +static void pcim_release(struct device *gendev, void *res) +{ + struct pci_dev *dev = to_pci_dev(gendev); + + if (pci_is_enabled(dev) && !dev->pinned) + pci_disable_device(dev); } static struct pci_devres *get_pci_dr(struct pci_dev *pdev) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index db2cc48f3d63..1b4832a60047 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4443,6 +4443,16 @@ void pci_intx(struct pci_dev *pdev, int enable) { u16 pci_command, new; + /* + * This is done for backwards compatibility, because the old PCI devres + * API had a mode in which this function became managed if the dev had + * been enabled with pcim_enable_device() instead of pci_enable_device(). + */ + if (pci_is_managed(pdev)) { + WARN_ON_ONCE(pcim_intx(pdev, enable) != 0); + return; + } + pci_read_config_word(pdev, PCI_COMMAND, &pci_command); if (enable) @@ -4450,17 +4460,8 @@ void pci_intx(struct pci_dev *pdev, int enable) else new = pci_command | PCI_COMMAND_INTX_DISABLE; - if (new != pci_command) { - struct pci_devres *dr; - + if (new != pci_command) pci_write_config_word(pdev, PCI_COMMAND, new); - - dr = find_pci_dr(pdev); - if (dr && !dr->restore_intx) { - dr->restore_intx = 1; - dr->orig_intx = !enable; - } - } } EXPORT_SYMBOL_GPL(pci_intx); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index c355bb6a698d..9e87528f1157 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -816,16 +816,17 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev) * there's no need to track it separately. pci_devres is initialized * when a device is enabled using managed PCI device enable interface. * - * TODO: Struct pci_devres and find_pci_dr() only need to be here because - * they're used in pci.c. Port or move these functions to devres.c and - * then remove them from here. + * TODO: Struct pci_devres only needs to be here because they're used in pci.c. + * Port or move these functions to devres.c and then remove them from here. */ struct pci_devres { - unsigned int orig_intx:1; - unsigned int restore_intx:1; + /* + * TODO: + * This struct is now surplus. Remove it by refactoring pci/devres.c + */ }; -struct pci_devres *find_pci_dr(struct pci_dev *pdev); +int pcim_intx(struct pci_dev *dev, int enable); int pcim_request_region(struct pci_dev *pdev, int bar, const char *name); int pcim_request_region_exclusive(struct pci_dev *pdev, int bar, const char *name);