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From:   Haiyang Zhang <haiyangz@microsoft.com>
To:     "sashal@kernel.org" <sashal@kernel.org>,
        "davem@davemloft.net" <davem@davemloft.net>,
        "saeedm@mellanox.com" <saeedm@mellanox.com>,
        "leon@kernel.org" <leon@kernel.org>,
        "eranbe@mellanox.com" <eranbe@mellanox.com>,
        "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>
CC:     Haiyang Zhang <haiyangz@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH net-next,v4, 2/6] PCI: hv: Add a Hyper-V PCI interface driver
 for software backchannel interface
Thread-Topic: [PATCH net-next,v4, 2/6] PCI: hv: Add a Hyper-V PCI interface
 driver for software backchannel interface
Thread-Index: AQHVWKc+GNFRZDxadEKTuhFzjn601Q==
Date:   Thu, 22 Aug 2019 05:05:41 +0000
Message-ID: <1566450236-36757-3-git-send-email-haiyangz@microsoft.com>
References: <1566450236-36757-1-git-send-email-haiyangz@microsoft.com>
In-Reply-To: <1566450236-36757-1-git-send-email-haiyangz@microsoft.com>
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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>
---
 MAINTAINERS                              |  1 +
 drivers/pci/Kconfig                      |  1 +
 drivers/pci/controller/Kconfig           |  7 ++++
 drivers/pci/controller/Makefile          |  1 +
 drivers/pci/controller/pci-hyperv-intf.c | 67 ++++++++++++++++++++++++++++=
++++
 drivers/pci/controller/pci-hyperv.c      | 12 ++++--
 include/linux/hyperv.h                   | 30 ++++++++++----
 7 files changed, 108 insertions(+), 11 deletions(-)
 create mode 100644 drivers/pci/controller/pci-hyperv-intf.c

diff --git a/MAINTAINERS b/MAINTAINERS
index a406947..9860853 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7469,6 +7469,7 @@ F:	drivers/hid/hid-hyperv.c
 F:	drivers/hv/
 F:	drivers/input/serio/hyperv-keyboard.c
 F:	drivers/pci/controller/pci-hyperv.c
+F:	drivers/pci/controller/pci-hyperv-intf.c
 F:	drivers/net/hyperv/
 F:	drivers/scsi/storvsc_drv.c
 F:	drivers/uio/uio_hv_generic.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 2ab9240..c313de9 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -182,6 +182,7 @@ config PCI_LABEL
 config PCI_HYPERV
         tristate "Hyper-V PCI Frontend"
         depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_6=
4
+	select PCI_HYPERV_INTERFACE
         help
           The PCI device frontend driver allows the kernel to import arbit=
rary
           PCI devices from a PCI backend to support PCI driver domains.
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfi=
g
index fe9f9f1..70e0782 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -281,5 +281,12 @@ config VMD
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmd.
=20
+config PCI_HYPERV_INTERFACE
+	tristate "Hyper-V PCI Interface"
+	depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
+	help
+	  The Hyper-V PCI Interface is a helper driver allows other drivers to
+	  have a common interface with the Hyper-V PCI frontend driver.
+
 source "drivers/pci/controller/dwc/Kconfig"
 endmenu
diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makef=
ile
index d56a507..a2a22c9 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_PCIE_CADENCE_HOST) +=3D pcie-cadence-host.o
 obj-$(CONFIG_PCIE_CADENCE_EP) +=3D pcie-cadence-ep.o
 obj-$(CONFIG_PCI_FTPCI100) +=3D pci-ftpci100.o
 obj-$(CONFIG_PCI_HYPERV) +=3D pci-hyperv.o
+obj-$(CONFIG_PCI_HYPERV_INTERFACE) +=3D pci-hyperv-intf.o
 obj-$(CONFIG_PCI_MVEBU) +=3D pci-mvebu.o
 obj-$(CONFIG_PCI_AARDVARK) +=3D pci-aardvark.o
 obj-$(CONFIG_PCI_TEGRA) +=3D pci-tegra.o
diff --git a/drivers/pci/controller/pci-hyperv-intf.c b/drivers/pci/control=
ler/pci-hyperv-intf.c
new file mode 100644
index 0000000..cc96be4
--- /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_l=
en,
+			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");
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/p=
ci-hyperv.c
index 57adeca..9c93ac2 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 *bu=
f, unsigned int len,
 	*bytes_returned =3D comp_pkt.bytes_returned;
 	return 0;
 }
-EXPORT_SYMBOL(hv_read_config_block);
=20
 /**
  * hv_pci_write_config_compl() - Invoked when a response packet for a writ=
e
@@ -1070,7 +1069,6 @@ int hv_write_config_block(struct pci_dev *pdev, void =
*buf, unsigned int len,
=20
 	return 0;
 }
-EXPORT_SYMBOL(hv_write_config_block);
=20
 /**
  * hv_register_block_invalidate() - Invoked when a config block invalidati=
on
@@ -1101,7 +1099,6 @@ int hv_register_block_invalidate(struct pci_dev *pdev=
, void *context,
 	return 0;
=20
 }
-EXPORT_SYMBOL(hv_register_block_invalidate);
=20
 /* Interrupt management hooks */
 static void hv_int_desc_free(struct hv_pci_dev *hpdev,
@@ -3045,10 +3042,19 @@ static int hv_pci_remove(struct hv_device *hdev)
 static void __exit exit_hv_pci_drv(void)
 {
 	vmbus_driver_unregister(&hv_pci_drv);
+
+	hvpci_block_ops.read_block =3D NULL;
+	hvpci_block_ops.write_block =3D NULL;
+	hvpci_block_ops.reg_blk_invalidate =3D NULL;
 }
=20
 static int __init init_hv_pci_drv(void)
 {
+	/* Initialize PCI block r/w interface */
+	hvpci_block_ops.read_block =3D hv_read_config_block;
+	hvpci_block_ops.write_block =3D hv_write_config_block;
+	hvpci_block_ops.reg_blk_invalidate =3D hv_register_block_invalidate;
+
 	return vmbus_driver_register(&hv_pci_drv);
 }
=20
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 9d37f8c..2afe6fd 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1579,18 +1579,32 @@ struct vmpacket_descriptor *
 	    pkt =3D hv_pkt_iter_next(channel, pkt))
=20
 /*
- * Functions for passing data between SR-IOV PF and VF drivers.  The VF dr=
iver
+ * Interface for passing data between SR-IOV PF and VF drivers. The VF dri=
ver
  * sends requests to read and write blocks. Each block must be 128 bytes o=
r
  * smaller. Optionally, the VF driver can register a callback function whi=
ch
  * will be invoked when the host says that one or more of the first 64 blo=
ck
  * IDs is "invalid" which means that the VF driver should reread them.
  */
 #define HV_CONFIG_BLOCK_SIZE_MAX 128
-int hv_read_config_block(struct pci_dev *dev, void *buf, unsigned int buf_=
len,
-			 unsigned int block_id, unsigned int *bytes_returned);
-int hv_write_config_block(struct pci_dev *dev, void *buf, unsigned int len=
,
-			  unsigned int block_id);
-int hv_register_block_invalidate(struct pci_dev *dev, void *context,
-				 void (*block_invalidate)(void *context,
-							  u64 block_mask));
+
+int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_l=
en,
+			unsigned int block_id, unsigned int *bytes_returned);
+int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
+			 unsigned int block_id);
+int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
+				void (*block_invalidate)(void *context,
+							 u64 block_mask));
+
+struct hyperv_pci_block_ops {
+	int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
+			  unsigned int block_id, unsigned int *bytes_returned);
+	int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
+			   unsigned int block_id);
+	int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
+				  void (*block_invalidate)(void *context,
+							   u64 block_mask));
+};
+
+extern struct hyperv_pci_block_ops hvpci_block_ops;
+
 #endif /* _HYPERV_H */
--=20
1.8.3.1