From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f181.google.com ([209.85.223.181]:32938 "EHLO mail-io0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751407AbbJBAuk (ORCPT ); Thu, 1 Oct 2015 20:50:40 -0400 From: David Daney To: linux-kernel@vger.kernel.org, Will Deacon , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Marc Zyngier , Grant Likely , Thomas Gleixner , Jason Cooper , Frank Rowand , Bjorn Helgaas , linux-pci@vger.kernel.org Cc: David Daney Subject: [PATCH v4 3/4] PCI/MSI: Add helper function pci_msi_domain_get_msi_rid(). Date: Thu, 1 Oct 2015 17:50:24 -0700 Message-Id: <1443747025-9918-4-git-send-email-ddaney.cavm@gmail.com> In-Reply-To: <1443747025-9918-1-git-send-email-ddaney.cavm@gmail.com> References: <1443747025-9918-1-git-send-email-ddaney.cavm@gmail.com> Sender: linux-pci-owner@vger.kernel.org List-ID: From: David Daney Add pci_msi_domain_get_msi_rid() to return the MSI requester id (RID). Initially needed by gic-v3 based systems. It will be used by follow on patch to drivers/irqchip/irq-gic-v3-its-pci-msi.c Initially supports mapping the RID via OF device tree. In the future, this could be extended to use ACPI _IORT tables as well. Signed-off-by: David Daney --- drivers/pci/msi.c | 30 ++++++++++++++++++++++++++++++ include/linux/msi.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index d449714..81a2798 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "pci.h" @@ -1327,4 +1328,33 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node, return domain; } + +static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data) +{ + u32 *pa = data; + + *pa = alias; + return 0; +} +/** + * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID) + * @domain: The interrupt domain + * @pdev: The PCI device. + * + * The RID for a device is formed from the alias, with a firmware + * supplied mapping applied + * + * Returns: The RID. + */ +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev) +{ + u32 rid = 0; + + pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid); + + if (domain->of_node) + rid = of_msi_map_rid(&pdev->dev, domain->of_node, rid); + + return rid; +} #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ diff --git a/include/linux/msi.h b/include/linux/msi.h index ad939d0..56e3b76 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -293,6 +293,7 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev, struct msi_desc *desc); int pci_msi_domain_check_cap(struct irq_domain *domain, struct msi_domain_info *info, struct device *dev); +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev); #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ #endif /* LINUX_MSI_H */ -- 1.9.1