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path: root/drivers/pci/controller/pci-hyperv-intf.c
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Diffstat (limited to 'drivers/pci/controller/pci-hyperv-intf.c')
-rw-r--r--drivers/pci/controller/pci-hyperv-intf.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/pci/controller/pci-hyperv-intf.c b/drivers/pci/controller/pci-hyperv-intf.c
new file mode 100644
index 000000000..cc96be450
--- /dev/null
+++ b/drivers/pci/controller/pci-hyperv-intf.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Author:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ *
+ * This small module is a helper driver allows other drivers to
+ * have a common interface with the Hyper-V PCI frontend driver.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hyperv.h>
+
+struct hyperv_pci_block_ops hvpci_block_ops;
+EXPORT_SYMBOL_GPL(hvpci_block_ops);
+
+int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
+ unsigned int block_id, unsigned int *bytes_returned)
+{
+ if (!hvpci_block_ops.read_block)
+ return -EOPNOTSUPP;
+
+ return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
+ bytes_returned);
+}
+EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
+
+int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
+ unsigned int block_id)
+{
+ if (!hvpci_block_ops.write_block)
+ return -EOPNOTSUPP;
+
+ return hvpci_block_ops.write_block(dev, buf, len, block_id);
+}
+EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
+
+int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
+ void (*block_invalidate)(void *context,
+ u64 block_mask))
+{
+ if (!hvpci_block_ops.reg_blk_invalidate)
+ return -EOPNOTSUPP;
+
+ return hvpci_block_ops.reg_blk_invalidate(dev, context,
+ block_invalidate);
+}
+EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
+
+static void __exit exit_hv_pci_intf(void)
+{
+}
+
+static int __init init_hv_pci_intf(void)
+{
+ return 0;
+}
+
+module_init(init_hv_pci_intf);
+module_exit(exit_hv_pci_intf);
+
+MODULE_DESCRIPTION("Hyper-V PCI Interface");
+MODULE_LICENSE("GPL v2");