Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941890AbcJYPQv (ORCPT ); Tue, 25 Oct 2016 11:16:51 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:58389 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758443AbcJYPQg (ORCPT ); Tue, 25 Oct 2016 11:16:36 -0400 From: Hanjun Guo To: Marc Zyngier , "Rafael J. Wysocki" , Lorenzo Pieralisi CC: , , , Thomas Gleixner , Greg KH , Tomasz Nowicki , Ma Jun , Kefeng Wang , "Agustin Vega-Frias" , Sinan Kaya , "G Gregory" , Charles Garcia-Tobin , , , , Hanjun Guo Subject: [PATCH v3 05/14] ACPI: platform-msi: retrieve dev id from IORT Date: Tue, 25 Oct 2016 23:09:20 +0800 Message-ID: <1477408169-22217-6-git-send-email-guohanjun@huawei.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1477408169-22217-1-git-send-email-guohanjun@huawei.com> References: <1477408169-22217-1-git-send-email-guohanjun@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3739 Lines: 114 From: Hanjun Guo For devices connecting to ITS, it needs dev id to identify itself, and this dev id is represented in the IORT table in named componant node [1] for platform devices, so in this patch we will scan the IORT to retrieve device's dev id. Introduce iort_pmsi_get_dev_id() with pointer dev passed in for that purpose. [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf Signed-off-by: Hanjun Guo Tested-by: Sinan Kaya Cc: Marc Zyngier Cc: Lorenzo Pieralisi Cc: Tomasz Nowicki Cc: Thomas Gleixner --- drivers/acpi/arm64/iort.c | 26 ++++++++++++++++++++++++++ drivers/irqchip/irq-gic-v3-its-platform-msi.c | 4 +++- include/linux/acpi_iort.h | 8 ++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 03bae2c..7d543aa 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -444,6 +444,32 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id) } /** + * iort_pmsi_get_dev_id() - Get the device id for a device + * @dev: The device for which the mapping is to be done. + * @dev_id: The device ID found. + * + * Returns: 0 for successful find a dev id, errors otherwise + */ +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) +{ + struct acpi_iort_node *node; + + if (!iort_table) + return -ENODEV; + + node = iort_find_dev_node(dev); + if (!node) { + dev_err(dev, "can't find related IORT node\n"); + return -ENODEV; + } + + if(!iort_node_get_id(node, dev_id, IORT_MSI_TYPE, 0)) + return -ENODEV; + + return 0; +} + +/** * iort_dev_find_its_id() - Find the ITS identifier for a device * @dev: The device. * @req_id: Device's Requster ID diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c index 3c94278..16587a9 100644 --- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c +++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c @@ -15,6 +15,7 @@ * along with this program. If not, see . */ +#include #include #include #include @@ -56,7 +57,8 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, msi_info = msi_get_domain_info(domain->parent); - ret = of_pmsi_get_dev_id(domain, dev, &dev_id); + ret = dev->of_node ? of_pmsi_get_dev_id(domain, dev, &dev_id) : + iort_pmsi_get_dev_id(dev, &dev_id); if (ret) return ret; diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index dcb2b60..3f717cc 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -33,6 +33,7 @@ void acpi_iort_init(void); bool iort_node_match(u8 type); u32 iort_msi_map_rid(struct device *dev, u32 req_id); +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); /* IOMMU interface */ const struct iommu_ops *iort_iommu_configure(struct device *dev); @@ -41,9 +42,16 @@ static inline void acpi_iort_init(void) { } static inline bool iort_node_match(u8 type) { return false; } 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; } + +static inline int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) +{ + return -ENODEV; +} + /* IOMMU interface */ static inline const struct iommu_ops *iort_iommu_configure(struct device *dev) -- 1.7.12.4