[xen staging] xen/arm: Add linux,pci-domain property for hwdom if not available.

[patchbot@xxxxxxx]

commit 4cfab4425d39f76660b4e76ba6ee4cbf0f92e7e5
Author:     Rahul Singh <rahul.singh@xxxxxxx>
AuthorDate: Wed Oct 13 13:28:43 2021 -0700
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Wed Oct 13 13:28:43 2021 -0700

    xen/arm: Add linux,pci-domain property for hwdom if not available.
    
    If the property is not present in the device tree node for host bridge,
    XEN while creating the dtb for hwdom will create this property and
    assigns the already allocated segment to the host bridge
    so that XEN and linux will have the same segment for the host bridges.
    
    Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c        | 16 ++++++++++++++++
 xen/arch/arm/pci/pci-host-common.c | 21 +++++++++++++++++++++
 xen/include/asm-arm/pci.h          |  9 +++++++++
 3 files changed, 46 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 4c28f1e4e2..0167731ab0 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -747,6 +747,22 @@ static int __init write_properties(struct domain *d, 
struct kernel_info *kinfo,
             return res;
     }
 
+    if ( is_pci_passthrough_enabled() && dt_device_type_is_equal(node, "pci") )
+    {
+        if ( !dt_find_property(node, "linux,pci-domain", NULL) )
+        {
+            uint16_t segment;
+
+            res = pci_get_host_bridge_segment(node, &segment);
+            if ( res < 0 )
+                return res;
+
+            res = fdt_property_cell(kinfo->fdt, "linux,pci-domain", segment);
+            if ( res )
+                return res;
+        }
+    }
+
     /*
      * Override the property "status" to disable the device when it's
      * marked for passthrough.
diff --git a/xen/arch/arm/pci/pci-host-common.c 
b/xen/arch/arm/pci/pci-host-common.c
index af208e7298..cdeb3a283a 100644
--- a/xen/arch/arm/pci/pci-host-common.c
+++ b/xen/arch/arm/pci/pci-host-common.c
@@ -271,6 +271,27 @@ struct pci_host_bridge *pci_find_host_bridge(uint16_t 
segment, uint8_t bus)
 
     return NULL;
 }
+
+/*
+ * This function will lookup an hostbridge based on config space address.
+ */
+int pci_get_host_bridge_segment(const struct dt_device_node *node,
+                                uint16_t *segment)
+{
+    struct pci_host_bridge *bridge;
+
+    list_for_each_entry( bridge, &pci_host_bridges, node )
+    {
+        if ( bridge->dt_node != node )
+            continue;
+
+        *segment = bridge->segment;
+        return 0;
+    }
+
+    return -EINVAL;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h
index aa0762ff15..81273e0d87 100644
--- a/xen/include/asm-arm/pci.h
+++ b/xen/include/asm-arm/pci.h
@@ -98,6 +98,8 @@ 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);
+int pci_get_host_bridge_segment(const struct dt_device_node *node,
+                                uint16_t *segment);
 
 static always_inline bool is_pci_passthrough_enabled(void)
 {
@@ -119,5 +121,12 @@ struct pci_dev;
 
 static inline void arch_pci_init_pdev(struct pci_dev *pdev) {}
 
+static inline int pci_get_host_bridge_segment(const struct dt_device_node 
*node,
+                                              uint16_t *segment)
+{
+    ASSERT_UNREACHABLE();
+    return -EINVAL;
+}
+
 #endif  /*!CONFIG_HAS_PCI*/
 #endif /* __ARM_PCI_H__ */
--
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