PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface

This interface driver is a helper driver allows other drivers to
have a common interface with the Hyper-V PCI frontend driver.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 57adeca7bda9..9c93ac2215b7 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -983,7 +983,6 @@ int hv_read_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
         *bytes_returned = comp_pkt.bytes_returned;
         return 0;
 }
-EXPORT_SYMBOL(hv_read_config_block);
 
 /**
  * hv_pci_write_config_compl() - Invoked when a response packet for a write
@@ -1070,7 +1069,6 @@ int hv_write_config_block(struct pci_dev *pdev, void *buf, unsigned int len,
 
         return 0;
 }
-EXPORT_SYMBOL(hv_write_config_block);
 
 /**
  * hv_register_block_invalidate() - Invoked when a config block invalidation
@@ -1101,7 +1099,6 @@ int hv_register_block_invalidate(struct pci_dev *pdev, void *context,
         return 0;
 
 }
-EXPORT_SYMBOL(hv_register_block_invalidate);
 
 /* Interrupt management hooks */
 static void hv_int_desc_free(struct hv_pci_dev *hpdev,
@@ -3045,10 +3042,19 @@ static struct hv_driver hv_pci_drv = {
 static void __exit exit_hv_pci_drv(void)
 {
         vmbus_driver_unregister(&hv_pci_drv);
+
+        hvpci_block_ops.read_block = NULL;
+        hvpci_block_ops.write_block = NULL;
+        hvpci_block_ops.reg_blk_invalidate = NULL;
 }
 
 static int __init init_hv_pci_drv(void)
 {
+        /* Initialize PCI block r/w interface */
+        hvpci_block_ops.read_block = hv_read_config_block;
+        hvpci_block_ops.write_block = hv_write_config_block;
+        hvpci_block_ops.reg_blk_invalidate = hv_register_block_invalidate;
+
         return vmbus_driver_register(&hv_pci_drv);
 }