From patchwork Tue Sep 6 09:08:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Nowicki X-Patchwork-Id: 666426 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3sT17Y5Jycz9s3v for ; Tue, 6 Sep 2016 19:11:53 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=semihalf-com.20150623.gappssmtp.com header.i=@semihalf-com.20150623.gappssmtp.com header.b=URAuvHuT; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755975AbcIFJLg (ORCPT ); Tue, 6 Sep 2016 05:11:36 -0400 Received: from mail-lf0-f47.google.com ([209.85.215.47]:33279 "EHLO mail-lf0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753534AbcIFJIz (ORCPT ); Tue, 6 Sep 2016 05:08:55 -0400 Received: by mail-lf0-f47.google.com with SMTP id h127so38167322lfh.0 for ; Tue, 06 Sep 2016 02:08:53 -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=/ilzmU6cIS0WrC+YyuLPUOitMOfkSezLz4DYPunYRUU=; b=URAuvHuTJkSo6dmYhy4uAdRXIlWylmCsZcXGfGG4f8B0EVFBmW4sjtrqkzN6W/CX6R uyhvarpXnFZ/PSzGjb0OKYhbvTOzS3Q8m16H5ohloxBtcBFZLdOd7CFLYFjF1hy5ufNs U32ZfwT2DzVtB6tW/O4Zlbqv0xIFAemJG//KHHYpDI2njFr2QFY5ycmxfXNufjfWYanQ FZxrdfEiY2ZhWE7iR/O+KNT49oJ5venLAedYheyGNYZOQZIClnvXUByi5ObYaTrMeiMN IjyTnwAA/iy+Y0hAqsKPPwyHq1Nhj9i4MgUP9/mvitQTkmRuJCije9arL9vKOROUmF6j 6TDw== 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=/ilzmU6cIS0WrC+YyuLPUOitMOfkSezLz4DYPunYRUU=; b=BNjoCUcUd/7sYx/3qktprUeBi+oBP9rt9QBfkm0Bl7UlrMcDm3MiCtgIEhGcWDSFQ8 7D31MW3HytFTA/TgGBQ6zxj9kMmP1BmxpxekUIQq/7zGcEB13pwcmQ0eII4EBch9Ddi2 F6IB1fIIUmKrb/bPmQzbj+u1twnXlqIWyzWThf/cQzDcf0BXYoEIQDXEhujZl+v5Seux U1JoFHpglWUmTNnh10mSCHubzrf9qY3UIxnJhQtgGAo5shdUFJbxkG9FeQzDlvwonAZf 2cSn8EHGcOQgjJM99bAzRUJ8fnlGc+ARKUncBhNrB04mQX4ROh9FrPQDi6rQy/CHksiX 7onw== X-Gm-Message-State: AE9vXwOP2eNAA+0TjjAjlW4P4WAO+DnIJxuvJbiA2jCvTsA+tvdZwAZZy/TwvtdOjOu1YQ== X-Received: by 10.25.19.33 with SMTP id j33mr5160735lfi.44.1473152932823; Tue, 06 Sep 2016 02:08:52 -0700 (PDT) Received: from tn-HP-4.semihalf.local (31-172-191-173.noc.fibertech.net.pl. [31.172.191.173]) by smtp.gmail.com with ESMTPSA id 184sm5443301lfz.22.2016.09.06.02.08.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 06 Sep 2016 02:08:52 -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 Cc: will.deacon@arm.com, catalin.marinas@arm.com, hanjun.guo@linaro.org, shijie.huang@arm.com, robert.richter@caviumnetworks.com, mw@semihalf.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, andrea.gallo@linaro.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, al.stone@linaro.org, graeme.gregory@linaro.org, ddaney.cavm@gmail.com, okaya@codeaurora.org, Tomasz Nowicki Subject: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI domain handling Date: Tue, 6 Sep 2016 11:08:52 +0200 Message-Id: <1473152938-17388-3-git-send-email-tn@semihalf.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1473152938-17388-1-git-send-email-tn@semihalf.com> References: <1473152938-17388-1-git-send-email-tn@semihalf.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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 Conflicts: drivers/acpi/arm64/iort.c --- drivers/acpi/arm64/iort.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi_iort.h | 12 ++++ 2 files changed, 164 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 34b8425..a6fba4d 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -22,6 +22,12 @@ #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); @@ -31,6 +37,76 @@ 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) @@ -207,6 +283,82 @@ static struct acpi_iort_node *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/acpi_iort.h b/include/linux/acpi_iort.h index fcacaf7..0e32dac 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -20,11 +20,23 @@ #define __ACPI_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 /* __ACPI_IORT_H__ */