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authorDavid Daney <david.daney@cavium.com>2015-10-08 15:10:49 -0700
committerMarc Zyngier <marc.zyngier@arm.com>2015-10-16 13:07:12 +0100
commitb6eec9b717d4dcb39ef024b8a3b619a32468b01e (patch)
tree938c3d37100f02ef76c4d197abc5cc662d3fa923 /drivers/pci/msi.c
parent8db02d8b4089fa8098a170738e8ae7939aa8ae7a (diff)
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PCI/MSI: Add helper function pci_msi_domain_get_msi_rid().
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. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ddd59fe786f8..5ab5c4f8dcb0 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -20,6 +20,7 @@
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/irqdomain.h>
+#include <linux/of_irq.h>
#include "pci.h"
@@ -1327,4 +1328,35 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnod
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)
+{
+ struct device_node *of_node;
+ u32 rid = 0;
+
+ 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);
+
+ return rid;
+}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */