[PATCH 03/10] powerpc/eeh: Search EEH device by guest address

[Gavin Shan]

The patch introduces function eeh_vfio_dev_get() to search the EEH
device according to its guest address, which is made up of PHB BUID,
bus, slot and function number. The function is useful in the backends
for EEH RTAS emulation.

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/eeh.h |  5 +++++
 arch/powerpc/kernel/eeh_pe.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 3268692..8ffaf39 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -381,6 +381,11 @@ static inline void eeh_remove_device(struct pci_dev *dev) { }
 #define EEH_IO_ERROR_VALUE(size) (-1UL)
 #endif /* CONFIG_EEH */
 
+
+#ifdef CONFIG_VFIO_EEH
+struct eeh_dev *eeh_vfio_dev_get(struct eeh_vfio_pci_addr *addr);
+#endif /* CONFIG_VFIO_EEH */
+
 #ifdef CONFIG_PPC64
 /*
  * MMIO read/write operations with EEH support.
diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
index fbd01eb..d09f055 100644
--- a/arch/powerpc/kernel/eeh_pe.c
+++ b/arch/powerpc/kernel/eeh_pe.c
@@ -248,6 +248,48 @@ struct eeh_pe *eeh_pe_get(struct eeh_dev *edev)
 	return pe;
 }
 
+#ifdef CONFIG_VFIO_EEH
+static void *__eeh_vfio_dev_get(void *data, void *flag)
+{
+	struct eeh_pe *pe = (struct eeh_pe *)data;
+	struct eeh_vfio_pci_addr *addr = (struct eeh_vfio_pci_addr *)flag;
+	struct eeh_dev *edev, *tmp;
+
+	eeh_pe_for_each_dev(pe, edev, tmp) {
+		if (!eeh_dev_passed(edev))
+			continue;
+
+		/* Comparing the address in the guest */
+		if (addr->buid == edev->gaddr.buid &&
+		    addr->bdn  == edev->gaddr.bdn)
+			return edev;
+	}
+
+	return NULL;
+}
+
+/**
+ * eeh_vfio_dev_get - Search EEH device based on guest's address
+ * @addr: EEH device guest address
+ *
+ * Search the EEH device according to its guest's address, which
+ * is made up of PHB BUID, and PCI config address.
+ */
+struct eeh_dev *eeh_vfio_dev_get(struct eeh_vfio_pci_addr *addr)
+{
+	struct eeh_pe *root;
+	struct eeh_dev *edev;
+
+	list_for_each_entry(root, &eeh_phb_pe, child) {
+		edev = eeh_pe_traverse(root, __eeh_vfio_dev_get, addr);
+		if (edev)
+			return edev;
+	}
+
+	return NULL;
+}
+#endif /* CONFIG_VFIO_EEH */
+
 /**
  * eeh_pe_get_parent - Retrieve the parent PE
  * @edev: EEH device
-- 
1.8.3.2