Commit-ID: b6eec9b717d4dcb39ef024b8a3b619a32468b01e
Gitweb: http://git.kernel.org/tip/b6eec9b717d4dcb39ef024b8a3b619a32468b01e
Author: David Daney <david.daney@xxxxxxxxxx>
AuthorDate: Thu, 8 Oct 2015 15:10:49 -0700
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Fri, 16 Oct 2015 13:07:12 +0100
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@xxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/pci/msi.c | 32 ++++++++++++++++++++++++++++++++
include/linux/msi.h | 1 +
2 files changed, 33 insertions(+)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ddd59fe..5ab5c4f 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 */
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 32a24b9..8772375 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -294,6 +294,7 @@ 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 */
--
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