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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>
This commit is contained in:
David Daney 2015-10-08 15:10:49 -07:00 committed by Marc Zyngier
parent 8db02d8b40
commit b6eec9b717
2 changed files with 33 additions and 0 deletions
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32
drivers/pci/msi.c
View File

@ -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 */

1
include/linux/msi.h
View File

@ -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 */