Subject: [Intel-wired-lan] [PATCH net-next 02/15] idpf: add module register and probe functionality

From: Pavan Kumar Linga <[email-masked]>
Date: Wed, 29 Mar 2023 07:03:51 -0700

From: Phani Burra <[email-masked]>

Add the required support to register IDPF PCI driver, as well as
probe and remove call backs. Enable the PCI device and request
the kernel to reserve the memory resources that will be used by the
driver. Finally map the BAR0 address space.

PCI IDs table is intentionally left blank to prevent the kernel from
probing the device with the incomplete driver. It will be added
in the last patch of the series.

Signed-off-by: Phani Burra <[email-masked]>
Co-developed-by: Alan Brady <[email-masked]>
Signed-off-by: Alan Brady <[email-masked]>
Co-developed-by: Madhu Chittim <[email-masked]>
Signed-off-by: Madhu Chittim <[email-masked]>
Co-developed-by: Shailendra Bhatnagar <[email-masked]>
Signed-off-by: Shailendra Bhatnagar <[email-masked]>
Co-developed-by: Pavan Kumar Linga <[email-masked]>
Signed-off-by: Pavan Kumar Linga <[email-masked]>
Reviewed-by: Sridhar Samudrala <[email-masked]>
---
 drivers/net/ethernet/intel/Kconfig            | 11 +++
 drivers/net/ethernet/intel/Makefile           |  1 +
 drivers/net/ethernet/intel/idpf/Makefile      | 10 ++
 drivers/net/ethernet/intel/idpf/idpf.h        | 27 ++++++
 .../net/ethernet/intel/idpf/idpf_controlq.h   | 14 +++
 drivers/net/ethernet/intel/idpf/idpf_lib.c    | 96 +++++++++++++++++++
 drivers/net/ethernet/intel/idpf/idpf_main.c   | 70 ++++++++++++++
 7 files changed, 229 insertions(+)
 create mode 100644 drivers/net/ethernet/intel/idpf/Makefile
 create mode 100644 drivers/net/ethernet/intel/idpf/idpf.h
 create mode 100644 drivers/net/ethernet/intel/idpf/idpf_controlq.h
 create mode 100644 drivers/net/ethernet/intel/idpf/idpf_lib.c
 create mode 100644 drivers/net/ethernet/intel/idpf/idpf_main.c

diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
index c18c3b373846..8c250326985f 100644
--- a/drivers/net/ethernet/intel/Kconfig
+++ b/drivers/net/ethernet/intel/Kconfig
@@ -373,4 +373,15 @@ config IGC
 	  To compile this driver as a module, choose M here. The module
 	  will be called igc.
 
+config IDPF
+	tristate "Intel(R) Infrastructure Data Path Function Support"
+	depends on PCI_MSI
+	select DIMLIB
+	help
+	  This driver supports Intel(R) Infrastructure Processing Unit (IPU)
+	  devices.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called idpf.
+
 endif # NET_VENDOR_INTEL
diff --git a/drivers/net/ethernet/intel/Makefile b/drivers/net/ethernet/intel/Makefile
index 3075290063f6..70cc2ae1cb97 100644
--- a/drivers/net/ethernet/intel/Makefile
+++ b/drivers/net/ethernet/intel/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_IXGB) += ixgb/
 obj-$(CONFIG_IAVF) += iavf/
 obj-$(CONFIG_FM10K) += fm10k/
 obj-$(CONFIG_ICE) += ice/
+obj-$(CONFIG_IDPF) += idpf/
diff --git a/drivers/net/ethernet/intel/idpf/Makefile b/drivers/net/ethernet/intel/idpf/Makefile
new file mode 100644
index 000000000000..d26521c987e1
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2023 Intel Corporation
+
+# Makefile for Infrastructure Data Path Function Linux Driver
+
+obj-$(CONFIG_IDPF) += idpf.o
+
+idpf-y := \
+	idpf_lib.o		\
+	idpf_main.o
diff --git a/drivers/net/ethernet/intel/idpf/idpf.h b/drivers/net/ethernet/intel/idpf/idpf.h
new file mode 100644
index 000000000000..7494f9d29970
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/idpf.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (C) 2023 Intel Corporation */
+
+#ifndef _IDPF_H_
+#define _IDPF_H_
+
+#include <linux/aer.h>
+#include <linux/etherdevice.h>
+#include <linux/pci.h>
+
+#include "idpf_controlq.h"
+
+/* available message levels */
+#define IDPF_AVAIL_NETIF_M (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
+
+struct idpf_adapter {
+	struct pci_dev *pdev;
+	u32 msg_enable;
+	struct idpf_hw hw;
+};
+
+int idpf_pf_probe(struct pci_dev *pdev, struct idpf_adapter *adapter);
+int idpf_vf_probe(struct pci_dev *pdev, struct idpf_adapter *adapter);
+int idpf_probe_common(struct pci_dev *pdev, struct idpf_adapter *adapter);
+void idpf_remove_common(struct pci_dev *pdev);
+
+#endif /* !_IDPF_H_ */
diff --git a/drivers/net/ethernet/intel/idpf/idpf_controlq.h b/drivers/net/ethernet/intel/idpf/idpf_controlq.h
new file mode 100644
index 000000000000..383089c91675
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/idpf_controlq.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (C) 2023 Intel Corporation */
+
+#ifndef _IDPF_CONTROLQ_H_
+#define _IDPF_CONTROLQ_H_
+
+struct idpf_hw {
+	void __iomem *hw_addr;
+	resource_size_t hw_addr_len;
+
+	void *back;
+};
+
+#endif /* _IDPF_CONTROLQ_H_ */
diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
new file mode 100644
index 000000000000..bf25574c75e4
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Intel Corporation */
+
+#include "idpf.h"
+
+/**
+ * idpf_cfg_hw - Initialize HW struct
+ * @adapter: adapter to setup hw struct for
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int idpf_cfg_hw(struct idpf_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct idpf_hw *hw = &adapter->hw;
+
+	hw->hw_addr = pcim_iomap_table(pdev)[0];
+	if (!hw->hw_addr) {
+		pci_err(pdev, "failed to allocate PCI iomap table\n");
+
+		return -ENOMEM;
+	}
+
+	hw->back = adapter;
+
+	return 0;
+}
+
+/**
+ * idpf_probe_common - Device initialization routine
+ * @pdev: PCI device information struct
+ * @adapter: driver specific private structure
+ *
+ * Returns 0 on success, negative on failure
+ */
+int idpf_probe_common(struct pci_dev *pdev, struct idpf_adapter *adapter)
+{
+	struct device *dev = &pdev->dev;
+	int err;
+
+	adapter->pdev = pdev;
+
+	err = pcim_enable_device(pdev);
+	if (err)
+		return err;
+
+	err = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
+	if (err) {
+		pci_err(pdev, "pcim_iomap_regions failed %pe\n", ERR_PTR(err));
+
+		return err;
+	}
+
+	/* set up for high or low dma */
+	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+	if (err) {
+		pci_err(pdev, "DMA configuration failed: %pe\n", ERR_PTR(err));
+
+		return err;
+	}
+
+	pci_enable_pcie_error_reporting(pdev);
+	pci_set_master(pdev);
+	pci_set_drvdata(pdev, adapter);
+
+	/* setup msglvl */
+	adapter->msg_enable = netif_msg_init(-1, IDPF_AVAIL_NETIF_M);
+
+	err = idpf_cfg_hw(adapter);
+	if (err) {
+		dev_err(dev, "Failed to configure HW structure for adapter: %d\n",
+			err);
+		goto err_cfg_hw;
+	}
+
+	return 0;
+
+err_cfg_hw:
+	pci_disable_pcie_error_reporting(pdev);
+
+	return err;
+}
+
+/**
+ * idpf_remove_common - Device removal routine
+ * @pdev: PCI device information struct
+ */
+void idpf_remove_common(struct pci_dev *pdev)
+{
+	struct idpf_adapter *adapter = pci_get_drvdata(pdev);
+
+	if (!adapter)
+		return;
+
+	pci_disable_pcie_error_reporting(pdev);
+}
diff --git a/drivers/net/ethernet/intel/idpf/idpf_main.c b/drivers/net/ethernet/intel/idpf/idpf_main.c
new file mode 100644
index 000000000000..617df9b924fa
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/idpf_main.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Intel Corporation */
+
+#include "idpf.h"
+
+#define DRV_SUMMARY	"Infrastructure Data Path Function Linux Driver"
+
+MODULE_DESCRIPTION(DRV_SUMMARY);
+MODULE_LICENSE("GPL");
+
+/**
+ * idpf_remove - Device removal routine
+ * @pdev: PCI device information struct
+ */
+static void idpf_remove(struct pci_dev *pdev)
+{
+	struct idpf_adapter *adapter = pci_get_drvdata(pdev);
+
+	if (!adapter)
+		return;
+
+	idpf_remove_common(pdev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+/**
+ * idpf_shutdown - PCI callback for shutting down device
+ * @pdev: PCI device information struct
+ */
+static void idpf_shutdown(struct pci_dev *pdev)
+{
+	idpf_remove(pdev);
+
+	if (system_state == SYSTEM_POWER_OFF)
+		pci_set_power_state(pdev, PCI_D3hot);
+}
+
+/**
+ * idpf_probe - Device initialization routine
+ * @pdev: PCI device information struct
+ * @ent: entry in idpf_pci_tbl
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int idpf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct idpf_adapter *adapter;
+
+	adapter = devm_kzalloc(&pdev->dev, sizeof(*adapter), GFP_KERNEL);
+	if (!adapter)
+		return -ENOMEM;
+
+	return idpf_probe_common(pdev, adapter);
+}
+
+/* idpf_pci_tbl - PCI Dev idpf ID Table
+ */
+static const struct pci_device_id idpf_pci_tbl[] = {
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(pci, idpf_pci_tbl);
+
+static struct pci_driver idpf_driver = {
+	.name			= KBUILD_MODNAME,
+	.id_table		= idpf_pci_tbl,
+	.probe			= idpf_probe,
+	.remove			= idpf_remove,
+	.shutdown		= idpf_shutdown,
+};
+module_pci_driver(idpf_driver);
-- 
2.37.3