[PATCH V7 3/8] PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI table
From: helgaas@kernel.org (Bjorn Helgaas)
Date: 2016-07-19 21:42:35
Also in:
linux-acpi, linux-pci, lkml
On Mon, Jun 20, 2016 at 01:02:16PM +0200, Tomasz Nowicki wrote:
It is possible to provide information about which MSI controller to use on a per-device basis for DT. This patch supply this with ACPI support. Currently, IORT is the only one ACPI table which can provide such mapping. In order to plug IORT into MSI infrastructure we are adding ACPI equivalents for finding PCI device domain and its RID translation (pci_msi_domain_get_msi_rid and pci_msi_domain_get_msi_rid calls). Signed-off-by: Tomasz Nowicki <redacted> Acked-by: Marc Zyngier <redacted>
Acked-by: Bjorn Helgaas <bhelgaas@google.com> I assume this will be merged along with the rest of the series via some non-PCI tree.
quoted hunk ↗ jump to hunk
--- drivers/pci/msi.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a080f44..1d45e81 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c@@ -18,6 +18,7 @@ #include <linux/smp.h> #include <linux/errno.h> #include <linux/io.h> +#include <linux/iort.h> #include <linux/slab.h> #include <linux/irqdomain.h> #include <linux/of_irq.h>@@ -1364,8 +1365,8 @@ u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev) pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid); of_node = irq_domain_get_of_node(domain); - if (of_node) - rid = of_msi_map_rid(&pdev->dev, of_node, rid); + rid = of_node ? of_msi_map_rid(&pdev->dev, of_node, rid) : + iort_msi_map_rid(&pdev->dev, rid); return rid; }@@ -1381,9 +1382,13 @@ u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev) */ struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev) { + struct irq_domain *dom; u32 rid = 0; pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid); - return of_msi_map_get_device_domain(&pdev->dev, rid); + dom = of_msi_map_get_device_domain(&pdev->dev, rid); + if (!dom) + dom = iort_get_device_domain(&pdev->dev, rid); + return dom; } #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */-- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel