[xen staging] xen/arm: Introduce pci_find_host_bridge_node helper

[patchbot@xxxxxxx]

commit 8858dfac1d83acd1b28643c616318631e3a4134d
Author:     Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
AuthorDate: Fri Oct 8 15:43:26 2021 -0700
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Fri Oct 8 15:43:26 2021 -0700

    xen/arm: Introduce pci_find_host_bridge_node helper
    
    Get host bridge node given a PCI device attached to it.
    
    This helper will be re-used for adding PCI devices by the subsequent
    patches.
    
    Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
    Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx>
    Tested-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/arch/arm/pci/pci-host-common.c | 16 ++++++++++++++++
 xen/include/asm-arm/pci.h          |  1 +
 2 files changed, 17 insertions(+)

diff --git a/xen/arch/arm/pci/pci-host-common.c 
b/xen/arch/arm/pci/pci-host-common.c
index c5941b10e9..af208e7298 100644
--- a/xen/arch/arm/pci/pci-host-common.c
+++ b/xen/arch/arm/pci/pci-host-common.c
@@ -236,6 +236,22 @@ err_exit:
     return err;
 }
 
+/*
+ * Get host bridge node given a device attached to it.
+ */
+struct dt_device_node *pci_find_host_bridge_node(struct device *dev)
+{
+    struct pci_host_bridge *bridge;
+    struct pci_dev *pdev = dev_to_pci(dev);
+
+    bridge = pci_find_host_bridge(pdev->seg, pdev->bus);
+    if ( unlikely(!bridge) )
+    {
+        printk(XENLOG_ERR "Unable to find PCI bridge for %pp\n", &pdev->sbdf);
+        return NULL;
+    }
+    return bridge->dt_node;
+}
 /*
  * This function will lookup an hostbridge based on the segment and bus
  * number.
diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h
index 8551704de3..ed76508002 100644
--- a/xen/include/asm-arm/pci.h
+++ b/xen/include/asm-arm/pci.h
@@ -89,6 +89,7 @@ int pci_generic_config_write(struct pci_host_bridge *bridge, 
pci_sbdf_t sbdf,
 void __iomem *pci_ecam_map_bus(struct pci_host_bridge *bridge,
                                pci_sbdf_t sbdf, uint32_t where);
 struct pci_host_bridge *pci_find_host_bridge(uint16_t segment, uint8_t bus);
+struct dt_device_node *pci_find_host_bridge_node(struct device *dev);
 
 static always_inline bool is_pci_passthrough_enabled(void)
 {
--
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