Date:   Wed, 5 Jan 2022 14:50:13 -0800
From:   Lizhi Hou <lizhi.hou@...inx.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Lizhi Hou <lizhi.hou@...inx.com>, <linux-fpga@...r.kernel.org>,
        <maxz@...inx.com>, <sonal.santan@...inx.com>, <yliu@...inx.com>,
        <michal.simek@...inx.com>, <stefanos@...inx.com>,
        <devicetree@...r.kernel.org>, <trix@...hat.com>, <mdf@...nel.org>,
        <robh@...nel.org>, <dwmw2@...radead.org>,
        Max Zhen <max.zhen@...inx.com>
Subject: [PATCH V4 XRT Alveo Infrastructure 5/5] fpga: xrt: management physical function driver

The PCIE device driver which attaches to management function on Alveo
devices. It instantiates one or more partition. Each partition consists
a set of hardward endpoints. A flat device tree is associated with each
partition. The first version of this driver uses test version flat device
tree and call xrt lib API to unflatten it.

Signed-off-by: Sonal Santan <sonal.santan@...inx.com>
Signed-off-by: Max Zhen <max.zhen@...inx.com>
Signed-off-by: Lizhi Hou <lizhi.hou@...inx.com>
---
 drivers/fpga/Makefile             |   1 +
 drivers/fpga/xrt/Kconfig          |   1 +
 drivers/fpga/xrt/mgmt/Kconfig     |  14 +++
 drivers/fpga/xrt/mgmt/Makefile    |  16 +++
 drivers/fpga/xrt/mgmt/dt-test.dts |  12 +++
 drivers/fpga/xrt/mgmt/dt-test.h   |  15 +++
 drivers/fpga/xrt/mgmt/xmgmt-drv.c | 158 ++++++++++++++++++++++++++++++
 7 files changed, 217 insertions(+)
 create mode 100644 drivers/fpga/xrt/mgmt/Kconfig
 create mode 100644 drivers/fpga/xrt/mgmt/Makefile
 create mode 100644 drivers/fpga/xrt/mgmt/dt-test.dts
 create mode 100644 drivers/fpga/xrt/mgmt/dt-test.h
 create mode 100644 drivers/fpga/xrt/mgmt/xmgmt-drv.c

diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 5bd41cf4c7ec..544e2144878f 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -52,3 +52,4 @@ obj-$(CONFIG_FPGA_DFL_PCI)		+= dfl-pci.o
 
 # XRT drivers for Alveo
 obj-$(CONFIG_FPGA_XRT_LIB)		+= xrt/lib/
+obj-$(CONFIG_FPGA_XRT_XMGMT)		+= xrt/mgmt/
diff --git a/drivers/fpga/xrt/Kconfig b/drivers/fpga/xrt/Kconfig
index 04c3bb5aaf4f..50422f77c6df 100644
--- a/drivers/fpga/xrt/Kconfig
+++ b/drivers/fpga/xrt/Kconfig
@@ -4,3 +4,4 @@
 #
 
 source "drivers/fpga/xrt/lib/Kconfig"
+source "drivers/fpga/xrt/mgmt/Kconfig"
diff --git a/drivers/fpga/xrt/mgmt/Kconfig b/drivers/fpga/xrt/mgmt/Kconfig
new file mode 100644
index 000000000000..a978747482be
--- /dev/null
+++ b/drivers/fpga/xrt/mgmt/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Xilinx XRT FPGA device configuration
+#
+
+config FPGA_XRT_XMGMT
+	tristate "Xilinx Alveo Management Driver"
+	depends on FPGA_XRT_LIB
+	select FPGA_BRIDGE
+	select FPGA_REGION
+	help
+	  Select this option to enable XRT PCIe driver for Xilinx Alveo FPGA.
+	  This driver provides interfaces for userspace application to access
+	  Alveo FPGA device.
diff --git a/drivers/fpga/xrt/mgmt/Makefile b/drivers/fpga/xrt/mgmt/Makefile
new file mode 100644
index 000000000000..c5134bf71cca
--- /dev/null
+++ b/drivers/fpga/xrt/mgmt/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2020-2022 Xilinx, Inc. All rights reserved.
+#
+# Authors: Sonal.Santan@...inx.com
+#
+
+FULL_XRT_PATH=$(srctree)/$(src)/..
+
+obj-$(CONFIG_FPGA_XRT_LIB) += xrt-mgmt.o
+
+xrt-mgmt-objs :=		\
+	xmgmt-drv.o		\
+	dt-test.dtb.o
+
+ccflags-y := -I$(FULL_XRT_PATH)/include
diff --git a/drivers/fpga/xrt/mgmt/dt-test.dts b/drivers/fpga/xrt/mgmt/dt-test.dts
new file mode 100644
index 000000000000..68dbcb7fd79d
--- /dev/null
+++ b/drivers/fpga/xrt/mgmt/dt-test.dts
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+/ {
+	compatible = "xlnx,alveo-partition", "simple-bus";
+	#address-cells = <2>;
+	#size-cells = <2>;
+	pr_isolate_ulp@0,41000 {
+		compatible = "xlnx,alveo-pr-isolation";
+		reg = <0x0 0x41000 0x0 0x1000>;
+	};
+};
diff --git a/drivers/fpga/xrt/mgmt/dt-test.h b/drivers/fpga/xrt/mgmt/dt-test.h
new file mode 100644
index 000000000000..6ec4203afbd2
--- /dev/null
+++ b/drivers/fpga/xrt/mgmt/dt-test.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Xilinx, Inc.
+ *
+ * Authors:
+ *	Lizhi Hou <lizhih@...inx.com>
+ */
+
+#ifndef _DT_TEST_H_
+#define _DT_TEST_H_
+
+extern u8 __dtb_dt_test_begin[];
+extern u8 __dtb_dt_test_end[];
+
+#endif	/* _DT_TEST_H_ */
diff --git a/drivers/fpga/xrt/mgmt/xmgmt-drv.c b/drivers/fpga/xrt/mgmt/xmgmt-drv.c
new file mode 100644
index 000000000000..87abe5b86e0b
--- /dev/null
+++ b/drivers/fpga/xrt/mgmt/xmgmt-drv.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo Management Function Driver
+ *
+ * Copyright (C) 2020-2022 Xilinx, Inc.
+ *
+ * Authors:
+ *	Cheng Zhen <maxz@...inx.com>
+ *	Lizhi Hou <lizhih@...inx.com>
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/aer.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include "xpartition.h"
+#include "dt-test.h"
+
+#define XMGMT_MODULE_NAME	"xrt-mgmt"
+
+#define XMGMT_PDEV(xm)		((xm)->pdev)
+#define XMGMT_DEV(xm)		(&(XMGMT_PDEV(xm)->dev))
+#define xmgmt_err(xm, fmt, args...)	\
+	dev_err(XMGMT_DEV(xm), "%s: " fmt, __func__, ##args)
+#define xmgmt_warn(xm, fmt, args...)	\
+	dev_warn(XMGMT_DEV(xm), "%s: " fmt, __func__, ##args)
+#define xmgmt_info(xm, fmt, args...)	\
+	dev_info(XMGMT_DEV(xm), "%s: " fmt, __func__, ##args)
+#define xmgmt_dbg(xm, fmt, args...)	\
+	dev_dbg(XMGMT_DEV(xm), "%s: " fmt, __func__, ##args)
+#define XMGMT_DEV_ID(_pcidev)			\
+	({ typeof(_pcidev) (pcidev) = (_pcidev);	\
+	((pci_domain_nr((pcidev)->bus) << 16) |	\
+	PCI_DEVID((pcidev)->bus->number, (pcidev)->devfn)); })
+
+#define XRT_MAX_READRQ		512
+
+/* PCI Device IDs */
+#define PCI_DEVICE_ID_U50		0x5020
+static const struct pci_device_id xmgmt_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_U50), }, /* Alveo U50 */
+	{ 0, }
+};
+
+struct xmgmt {
+	struct pci_dev *pdev;
+	void *base_partition;
+
+	bool ready;
+};
+
+static int xmgmt_config_pci(struct xmgmt *xm)
+{
+	struct pci_dev *pdev = XMGMT_PDEV(xm);
+	int rc;
+
+	rc = pcim_enable_device(pdev);
+	if (rc < 0) {
+		xmgmt_err(xm, "failed to enable device: %d", rc);
+		return rc;
+	}
+
+	rc = pci_enable_pcie_error_reporting(pdev);
+	if (rc)
+		xmgmt_warn(xm, "failed to enable AER: %d", rc);
+
+	pci_set_master(pdev);
+
+	rc = pcie_get_readrq(pdev);
+	if (rc > XRT_MAX_READRQ)
+		pcie_set_readrq(pdev, XRT_MAX_READRQ);
+	return 0;
+}
+
+static int xmgmt_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct xrt_partition_range ranges[PCI_NUM_RESOURCES];
+	struct xrt_partition_info xp_info = { 0 };
+	struct device *dev = &pdev->dev;
+	int ret, i, idx = 0;
+	struct xmgmt *xm;
+
+	xm = devm_kzalloc(dev, sizeof(*xm), GFP_KERNEL);
+	if (!xm)
+		return -ENOMEM;
+	xm->pdev = pdev;
+	pci_set_drvdata(pdev, xm);
+
+	ret = xmgmt_config_pci(xm);
+	if (ret)
+		goto failed;
+
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		if (pci_resource_len(pdev, i) > 0) {
+			ranges[idx].bar_idx = i;
+			ranges[idx].base = pci_resource_start(pdev, i);
+			ranges[idx].size = pci_resource_len(pdev, i);
+			idx++;
+		}
+	}
+	xp_info.num_range = idx;
+	xp_info.ranges = ranges;
+	xp_info.fdt = __dtb_dt_test_begin;
+	xp_info.fdt_len = (u32)(__dtb_dt_test_end - __dtb_dt_test_begin);
+	ret = xrt_partition_create(&pdev->dev, &xp_info, &xm->base_partition);
+	if (ret)
+		goto failed;
+
+	xmgmt_info(xm, "%s started successfully", XMGMT_MODULE_NAME);
+	return 0;
+
+failed:
+	if (xm->base_partition)
+		xrt_partition_destroy(xm->base_partition);
+	pci_set_drvdata(pdev, NULL);
+	return ret;
+}
+
+static void xmgmt_remove(struct pci_dev *pdev)
+{
+	struct xmgmt *xm = pci_get_drvdata(pdev);
+
+	xrt_partition_destroy(xm->base_partition);
+	pci_disable_pcie_error_reporting(xm->pdev);
+	xmgmt_info(xm, "%s cleaned up successfully", XMGMT_MODULE_NAME);
+}
+
+static struct pci_driver xmgmt_driver = {
+	.name = XMGMT_MODULE_NAME,
+	.id_table = xmgmt_pci_ids,
+	.probe = xmgmt_probe,
+	.remove = xmgmt_remove,
+};
+
+static int __init xmgmt_init(void)
+{
+	int res = 0;
+
+	res = pci_register_driver(&xmgmt_driver);
+	if (res)
+		return res;
+
+	return 0;
+}
+
+static __exit void xmgmt_exit(void)
+{
+	pci_unregister_driver(&xmgmt_driver);
+}
+
+module_init(xmgmt_init);
+module_exit(xmgmt_exit);
+
+MODULE_DEVICE_TABLE(pci, xmgmt_pci_ids);
+MODULE_AUTHOR("XRT Team <runtime@...inx.com>");
+MODULE_DESCRIPTION("Xilinx Alveo management function driver");
+MODULE_LICENSE("GPL v2");
-- 
2.27.0

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