Function vfio_device_api_string() returns string based on flag set in
vfio_device_info's flag. This should be used by vendor driver to get string
based on flag for device_api attribute.

Signed-off-by: Kirti Wankhede <kwankh...@nvidia.com>
Signed-off-by: Neo Jia <c...@nvidia.com>
Change-Id: I42d29f475f02a7132ce13297fbf2b48f1da10995
---
 drivers/vfio/vfio.c  | 15 +++++++++++++++
 include/linux/vfio.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 10ef1c5fa762..aec470454a13 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1917,6 +1917,21 @@ int vfio_set_irqs_validate_and_prepare(struct 
vfio_irq_set *hdr, int num_irqs,
 }
 EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare);
 
+const char *vfio_device_api_string(u32 flags)
+{
+       if (flags & VFIO_DEVICE_FLAGS_PCI)
+               return "vfio-pci";
+
+       if (flags & VFIO_DEVICE_FLAGS_PLATFORM)
+               return "vfio-platform";
+
+       if (flags & VFIO_DEVICE_FLAGS_AMBA)
+               return "vfio-amba";
+
+       return "";
+}
+EXPORT_SYMBOL(vfio_device_api_string);
+
 /*
  * Pin a set of guest PFNs and return their associated host PFNs for local
  * domain only.
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 31d059f1649b..fca2bf23c4f1 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -116,6 +116,8 @@ extern int vfio_set_irqs_validate_and_prepare(struct 
vfio_irq_set *hdr,
                                              int num_irqs, int max_irq_type,
                                              size_t *data_size);
 
+extern const char *vfio_device_api_string(u32 flags);
+
 struct pci_dev;
 #ifdef CONFIG_EEH
 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
-- 
2.7.0

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