From patchwork Mon Sep 5 20:05:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Nowicki X-Patchwork-Id: 9315149 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 59A48607D3 for ; Mon, 5 Sep 2016 20:09:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AE29287BC for ; Mon, 5 Sep 2016 20:09:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F1D5287FD; Mon, 5 Sep 2016 20:09:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 89BF0287BC for ; Mon, 5 Sep 2016 20:09:00 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bh0B2-0007lh-KN; Mon, 05 Sep 2016 20:07:32 +0000 Received: from mail-lf0-x232.google.com ([2a00:1450:4010:c07::232]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bh0Am-0007cm-WA for linux-arm-kernel@lists.infradead.org; Mon, 05 Sep 2016 20:07:18 +0000 Received: by mail-lf0-x232.google.com with SMTP id h127so29400292lfh.0 for ; Mon, 05 Sep 2016 13:06:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=semihalf-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=+/BYq3TpsvzhyiVOOhX9ROHSYdLBwfvyi2IOfRVFQqM=; b=d4ReAfY0RROrbXExqNkUHe3BnYPuMKxn12hh1yhdcYvOLhKp1DeHvNZ5oZF8mo0V4r /kTX4ZG2PnwP+mTORTU//66n83eDpieNnP1z7AHocS71CrbxaGcUuIvT0a0/V4xwhEDA Bx6O7aVVdd3xng9PsiKQbcMYBe8XX1CtsmFv2NuKC8rEDwljfTyQiHdanTGgpZsy0q6d omN5EcgTsevYr7ApH0pLpdcUQZYT8Qh7WqhX30xn9E6UMHBUUx2RRfqJZMoYVsmNZOom jDWXQuko7yneQ1gy/QsWmSqFBqFLjID/5tLj626+O1Yz5qdYCh4rgpEvFZxpA/ctdndX LT/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=+/BYq3TpsvzhyiVOOhX9ROHSYdLBwfvyi2IOfRVFQqM=; b=HYoge1kSyWcVoP+SBzLE4lk7YMXNN5RqooYGM4tOJ+uiMT2hrCBmgozG5qR2JFBB6t QAUENu+KnH/i/dJi5IbDXp2FSgQkuL4mRzz0M4oTW2Eja1Kr8w/TuI9Sba/gSYVh3siw 6+AzqovZIkF9dFyEZzQiEmtSlR7xEW15UDYw/poM+S7o8gN9YxaLrBlm3PFXqqckz2fs Py8lXS6H+74gSacAZHIDXTDn1Sy7QJR8WRhVccfd25iUBKKG+ZXXBBQdZEQc1ctExYnd FzISVcKeh9/Rw/wqYfAiVIb+Vhgmtu4FcBCvs9cDuY0OMVceDJaR+M+IGW04hcmdyxLK E2WQ== X-Gm-Message-State: AE9vXwNzq8ohmOWhTY77HfzO7urhZ3XIO6/Fch/g0DPRND3RgmRuLX/AVoJj5WuwRA9VJg== X-Received: by 10.25.90.198 with SMTP id o189mr9249823lfb.193.1473106014881; Mon, 05 Sep 2016 13:06:54 -0700 (PDT) Received: from localhost.localdomain (50-233-148-156-static.hfc.comcastbusiness.net. [50.233.148.156]) by smtp.gmail.com with ESMTPSA id p82sm5068405lfd.15.2016.09.05.13.06.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 05 Sep 2016 13:06:54 -0700 (PDT) From: Tomasz Nowicki To: marc.zyngier@arm.com, tglx@linutronix.de, jason@lakedaemon.net, rjw@rjwysocki.net, helgaas@kernel.org, rafael@kernel.org, Lorenzo.Pieralisi@arm.com Subject: [PATCH V9 2/8] ACPI: Add new IORT functions to support MSI domain handling Date: Mon, 5 Sep 2016 22:05:34 +0200 Message-Id: <1473105940-9761-3-git-send-email-tn@semihalf.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1473105940-9761-1-git-send-email-tn@semihalf.com> References: <1473105940-9761-1-git-send-email-tn@semihalf.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160905_130717_314169_409A4E44 X-CRM114-Status: GOOD ( 16.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: graeme.gregory@linaro.org, al.stone@linaro.org, linaro-acpi@lists.linaro.org, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, okaya@codeaurora.org, linux-acpi@vger.kernel.org, robert.richter@caviumnetworks.com, hanjun.guo@linaro.org, ddaney.cavm@gmail.com, linux-pci@vger.kernel.org, shijie.huang@arm.com, Tomasz Nowicki , mw@semihalf.com, andrea.gallo@linaro.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP For ITS, MSI functionality consists on building domain stack and during that process we need to reference to domain stack components e.g. before we create new DOMAIN_BUS_PCI_MSI domain we need to specify its DOMAIN_BUS_NEXUS parent domain. In order to manage that process properly, maintain list which elements contain domain token (unique for MSI domain stack) and ITS ID: iort_register_domain_token() and iort_deregister_domain_token(). Then retrieve domain token any time later with ITS ID being key off: iort_find_domain_token(). With domain token and domain type we are able to find corresponding IRQ domain. Since IORT is prepared to describe MSI domain on a per-device basis, use existing IORT helpers and implement two calls: 1. iort_msi_map_rid() to map MSI RID for a device 2. iort_get_device_domain() to find domain token for a device Signed-off-by: Tomasz Nowicki Reviewed-by: Hanjun Guo --- drivers/acpi/arm64/iort.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/iort.h | 11 ++++ 2 files changed, 168 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 82d5e7d..f38253c 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -22,12 +22,91 @@ #include #include +struct iort_its_msi_chip { + struct list_head list; + struct fwnode_handle *fw_node; + u32 translation_id; +}; + typedef acpi_status (*iort_find_node_callback) (struct acpi_iort_node *node, void *context); /* Root pointer to the mapped IORT table */ static struct acpi_table_header *iort_table; +static LIST_HEAD(iort_msi_chip_list); +static DEFINE_SPINLOCK(iort_msi_chip_lock); + +/** + * iort_register_domain_token() - register domain token and related ITS ID + * to the list from where we can get it back later on. + * @trans_id: ITS ID. + * @fw_node: Domain token. + * + * Returns: 0 on success, -ENOMEM if no memory when allocating list element + */ +int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node) +{ + struct iort_its_msi_chip *its_msi_chip; + + its_msi_chip = kzalloc(sizeof(*its_msi_chip), GFP_KERNEL); + if (!its_msi_chip) + return -ENOMEM; + + its_msi_chip->fw_node = fw_node; + its_msi_chip->translation_id = trans_id; + + spin_lock(&iort_msi_chip_lock); + list_add(&its_msi_chip->list, &iort_msi_chip_list); + spin_unlock(&iort_msi_chip_lock); + + return 0; +} + +/** + * iort_deregister_domain_token() - Deregister domain token based on ITS ID + * @trans_id: ITS ID. + * + * Returns: none. + */ +void iort_deregister_domain_token(int trans_id) +{ + struct iort_its_msi_chip *its_msi_chip, *t; + + spin_lock(&iort_msi_chip_lock); + list_for_each_entry_safe(its_msi_chip, t, &iort_msi_chip_list, list) { + if (its_msi_chip->translation_id == trans_id) { + list_del(&its_msi_chip->list); + kfree(its_msi_chip); + break; + } + } + spin_unlock(&iort_msi_chip_lock); +} + +/** + * iort_find_domain_token() - Find domain token based on given ITS ID + * @trans_id: ITS ID. + * + * Returns: domain token when find on the list, NULL otherwise + */ +struct fwnode_handle *iort_find_domain_token(int trans_id) +{ + struct fwnode_handle *fw_node = NULL; + struct iort_its_msi_chip *its_msi_chip; + + spin_lock(&iort_msi_chip_lock); + list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) { + if (its_msi_chip->translation_id == trans_id) { + fw_node = its_msi_chip->fw_node; + break; + } + } + spin_unlock(&iort_msi_chip_lock); + + return fw_node; +} + static struct acpi_iort_node * iort_scan_node(enum acpi_iort_node_type type, iort_find_node_callback callback, void *context) @@ -209,6 +288,84 @@ iort_find_dev_node(struct device *dev) iort_match_node_callback, &pbus->dev); } +/** + * iort_msi_map_rid() - Map a MSI requester ID for a device + * @dev: The device for which the mapping is to be done. + * @req_id: The device requester ID. + * + * Returns: mapped MSI RID on success, input requester ID otherwise + */ +u32 iort_msi_map_rid(struct device *dev, u32 req_id) +{ + struct acpi_iort_node *node; + u32 dev_id; + + node = iort_find_dev_node(dev); + if (!node) + return req_id; + + iort_node_map_rid(node, req_id, &dev_id, ACPI_IORT_NODE_ITS_GROUP); + return dev_id; +} + +/** + * iort_dev_find_its_id() - Find the ITS identifier for a device + * @dev: The device. + * @idx: Index of the ITS identifier list. + * @its_id: ITS identifier. + * + * Returns: 0 on success, appropriate error value otherwise + */ +static int +iort_dev_find_its_id(struct device *dev, u32 req_id, unsigned int idx, + int *its_id) +{ + struct acpi_iort_its_group *its; + struct acpi_iort_node *node; + + node = iort_find_dev_node(dev); + if (!node) + return -ENXIO; + + node = iort_node_map_rid(node, req_id, NULL, ACPI_IORT_NODE_ITS_GROUP); + if (!node) + return -ENXIO; + + /* Move to ITS specific data */ + its = (struct acpi_iort_its_group *)node->node_data; + if (idx > its->its_count) { + dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n", + idx, its->its_count); + return -ENXIO; + } + + *its_id = its->identifiers[idx]; + return 0; +} + +/** + * iort_get_device_domain() - Find MSI domain related to a device + * @dev: The device. + * @req_id: Requester ID for the device. + * + * Returns: the MSI domain for this device, NULL otherwise + */ +struct irq_domain * +iort_get_device_domain(struct device *dev, u32 req_id) +{ + static struct fwnode_handle *handle; + int its_id; + + if (iort_dev_find_its_id(dev, req_id, 0, &its_id)) + return NULL; + + handle = iort_find_domain_token(its_id); + if (!handle) + return NULL; + + return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI); +} + void __init acpi_iort_init(void) { acpi_status status; diff --git a/include/linux/iort.h b/include/linux/iort.h index f4d5d45..74ab47f 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -20,11 +20,22 @@ #define __IORT_H__ #include +#include +#include +int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node); +void iort_deregister_domain_token(int trans_id); +struct fwnode_handle *iort_find_domain_token(int trans_id); #ifdef CONFIG_ACPI_IORT void acpi_iort_init(void); +u32 iort_msi_map_rid(struct device *dev, u32 req_id); +struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); #else static inline void acpi_iort_init(void) { } +static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id) +{ return req_id; } +static inline struct irq_domain * +iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; } #endif #endif /* __IORT_H__ */