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Message-Id: <20210105025839.23169-3-mike.ximing.chen@intel.com>
Date: Mon, 4 Jan 2021 20:58:21 -0600
From: Mike Ximing Chen <mike.ximing.chen@...el.com>
To: linux-kernel@...r.kernel.org
Cc: arnd@...db.de, gregkh@...uxfoundation.org,
dan.j.williams@...el.com, pierre-louis.bossart@...ux.intel.com,
Gage Eads <gage.eads@...el.com>
Subject: [PATCH v8 02/20] dlb: initialize device
Assign the physical function device 'ops' callbacks, map the PCI BAR space,
create a char device, set the DMA API mask for 64-bit addressing. Add the
corresponding undo operations to the remove callback.
The ops callbacks are implement behavior that differs depending on device
type -- physical function (PF, as implemented here) or virtual
function/device (support to be added later).
Signed-off-by: Gage Eads <gage.eads@...el.com>
Signed-off-by: Mike Ximing Chen <mike.ximing.chen@...el.com>
Reviewed-by: Magnus Karlsson <magnus.karlsson@...el.com>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/misc/dlb/Makefile | 1 +
drivers/misc/dlb/dlb_hw_types.h | 23 ++++++++++++
drivers/misc/dlb/dlb_main.c | 63 +++++++++++++++++++++++++++++++++
drivers/misc/dlb/dlb_main.h | 14 ++++++++
drivers/misc/dlb/dlb_pf_ops.c | 50 ++++++++++++++++++++++++++
5 files changed, 151 insertions(+)
create mode 100644 drivers/misc/dlb/dlb_pf_ops.c
diff --git a/drivers/misc/dlb/Makefile b/drivers/misc/dlb/Makefile
index 8911375effd2..a33bf774e6a8 100644
--- a/drivers/misc/dlb/Makefile
+++ b/drivers/misc/dlb/Makefile
@@ -7,3 +7,4 @@
obj-$(CONFIG_INTEL_DLB) := dlb.o
dlb-objs := dlb_main.o
+dlb-objs += dlb_pf_ops.o
diff --git a/drivers/misc/dlb/dlb_hw_types.h b/drivers/misc/dlb/dlb_hw_types.h
index 778ec8665ea0..a4ce28c157de 100644
--- a/drivers/misc/dlb/dlb_hw_types.h
+++ b/drivers/misc/dlb/dlb_hw_types.h
@@ -4,6 +4,20 @@
#ifndef __DLB_HW_TYPES_H
#define __DLB_HW_TYPES_H
+#include <linux/io.h>
+
+/* Read/write register 'reg' in the CSR BAR space */
+#define DLB_CSR_REG_ADDR(a, reg) ((a)->csr_kva + (reg))
+#define DLB_CSR_RD(hw, reg) ioread32(DLB_CSR_REG_ADDR((hw), (reg)))
+#define DLB_CSR_WR(hw, reg, value) iowrite32((value), \
+ DLB_CSR_REG_ADDR((hw), (reg)))
+
+/* Read/write register 'reg' in the func BAR space */
+#define DLB_FUNC_REG_ADDR(a, reg) ((a)->func_kva + (reg))
+#define DLB_FUNC_RD(hw, reg) ioread32(DLB_FUNC_REG_ADDR((hw), (reg)))
+#define DLB_FUNC_WR(hw, reg, value) iowrite32((value), \
+ DLB_FUNC_REG_ADDR((hw), (reg)))
+
#define DLB_MAX_NUM_VDEVS 16
#define DLB_MAX_NUM_DOMAINS 32
#define DLB_MAX_NUM_LDB_QUEUES 32 /* LDB == load-balanced */
@@ -29,4 +43,13 @@
#define PCI_DEVICE_ID_INTEL_DLB_PF 0x2710
+struct dlb_hw {
+ /* BAR 0 address */
+ void __iomem *csr_kva;
+ unsigned long csr_phys_addr;
+ /* BAR 2 address */
+ void __iomem *func_kva;
+ unsigned long func_phys_addr;
+};
+
#endif /* __DLB_HW_TYPES_H */
diff --git a/drivers/misc/dlb/dlb_main.c b/drivers/misc/dlb/dlb_main.c
index d4538f226d53..f58116b62d5e 100644
--- a/drivers/misc/dlb/dlb_main.c
+++ b/drivers/misc/dlb/dlb_main.c
@@ -16,10 +16,42 @@ MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel(R) Dynamic Load Balancer (DLB) Driver");
static struct class *dlb_class;
+static struct cdev dlb_cdev;
static dev_t dlb_devt;
static DEFINE_IDR(dlb_ids);
static DEFINE_SPINLOCK(dlb_ids_lock);
+static int dlb_device_create(struct dlb *dlb, struct pci_dev *pdev)
+{
+ /*
+ * Create a new device in order to create a /dev/dlb node. This device
+ * is a child of the DLB PCI device.
+ */
+ dlb->dev_number = MKDEV(MAJOR(dlb_devt), dlb->id);
+ dlb->dev = device_create(dlb_class,
+ &pdev->dev,
+ dlb->dev_number,
+ dlb,
+ "dlb%d",
+ dlb->id);
+ if (IS_ERR(dlb->dev)) {
+ dev_err(dlb->dev, "device_create() returned %ld\n",
+ PTR_ERR(dlb->dev));
+
+ return PTR_ERR(dlb->dev);
+ }
+
+ return 0;
+}
+
+/********************************/
+/****** Char dev callbacks ******/
+/********************************/
+
+static const struct file_operations dlb_fops = {
+ .owner = THIS_MODULE,
+};
+
/**********************************/
/****** PCI driver callbacks ******/
/**********************************/
@@ -34,6 +66,8 @@ static int dlb_probe(struct pci_dev *pdev,
if (!dlb)
return -ENOMEM;
+ dlb->ops = &dlb_pf_ops;
+
pci_set_drvdata(pdev, dlb);
dlb->pdev = pdev;
@@ -75,8 +109,24 @@ static int dlb_probe(struct pci_dev *pdev,
if (pci_enable_pcie_error_reporting(pdev))
dev_info(&pdev->dev, "[%s()] Failed to enable AER\n", __func__);
+ ret = dlb->ops->map_pci_bar_space(dlb, pdev);
+ if (ret)
+ goto map_pci_bar_fail;
+
+ ret = dlb_device_create(dlb, pdev);
+ if (ret)
+ goto map_pci_bar_fail;
+
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (ret)
+ goto dma_set_mask_fail;
+
return 0;
+dma_set_mask_fail:
+ device_destroy(dlb_class, dlb->dev_number);
+map_pci_bar_fail:
+ pci_disable_pcie_error_reporting(pdev);
pci_enable_device_fail:
spin_lock(&dlb_ids_lock);
idr_remove(&dlb_ids, dlb->id);
@@ -89,6 +139,8 @@ static void dlb_remove(struct pci_dev *pdev)
{
struct dlb *dlb = pci_get_drvdata(pdev);
+ device_destroy(dlb_class, dlb->dev_number);
+
pci_disable_pcie_error_reporting(pdev);
spin_lock(&dlb_ids_lock);
@@ -111,6 +163,7 @@ static struct pci_driver dlb_pci_driver = {
static int __init dlb_init_module(void)
{
+ int dlb_major;
int err;
dlb_class = class_create(THIS_MODULE, "dlb");
@@ -133,6 +186,12 @@ static int __init dlb_init_module(void)
goto alloc_chrdev_fail;
}
+ dlb_major = MAJOR(dlb_devt);
+ cdev_init(&dlb_cdev, &dlb_fops);
+ err = cdev_add(&dlb_cdev, MKDEV(dlb_major, 0), DLB_MAX_NUM_DEVICES);
+ if (err)
+ goto cdev_add_fail;
+
err = pci_register_driver(&dlb_pci_driver);
if (err < 0) {
pr_err("dlb: pci_register_driver() returned %d\n", err);
@@ -143,6 +202,8 @@ static int __init dlb_init_module(void)
return 0;
pci_register_fail:
+ cdev_del(&dlb_cdev);
+cdev_add_fail:
unregister_chrdev_region(dlb_devt, DLB_MAX_NUM_DEVICES);
alloc_chrdev_fail:
class_destroy(dlb_class);
@@ -154,6 +215,8 @@ static void __exit dlb_exit_module(void)
{
pci_unregister_driver(&dlb_pci_driver);
+ cdev_del(&dlb_cdev);
+
unregister_chrdev_region(dlb_devt, DLB_MAX_NUM_DEVICES);
class_destroy(dlb_class);
diff --git a/drivers/misc/dlb/dlb_main.h b/drivers/misc/dlb/dlb_main.h
index 2fae3d6f3d2d..f0567b836e27 100644
--- a/drivers/misc/dlb/dlb_main.h
+++ b/drivers/misc/dlb/dlb_main.h
@@ -29,9 +29,23 @@ enum dlb_device_type {
DLB_PF,
};
+struct dlb;
+
+struct dlb_device_ops {
+ int (*map_pci_bar_space)(struct dlb *dlb, struct pci_dev *pdev);
+ void (*unmap_pci_bar_space)(struct dlb *dlb, struct pci_dev *pdev);
+};
+
+extern struct dlb_device_ops dlb_pf_ops;
+
struct dlb {
struct pci_dev *pdev;
+ struct dlb_hw hw;
+ struct dlb_device_ops *ops;
+ struct device *dev;
+ enum dlb_device_type type;
int id;
+ dev_t dev_number;
};
#endif /* __DLB_MAIN_H */
diff --git a/drivers/misc/dlb/dlb_pf_ops.c b/drivers/misc/dlb/dlb_pf_ops.c
new file mode 100644
index 000000000000..0951c99f6183
--- /dev/null
+++ b/drivers/misc/dlb/dlb_pf_ops.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(C) 2016-2020 Intel Corporation. All rights reserved. */
+
+#include "dlb_main.h"
+
+/********************************/
+/****** PCI BAR management ******/
+/********************************/
+
+static void
+dlb_pf_unmap_pci_bar_space(struct dlb *dlb, struct pci_dev *pdev)
+{
+ pcim_iounmap(pdev, dlb->hw.csr_kva);
+ pcim_iounmap(pdev, dlb->hw.func_kva);
+}
+
+static int
+dlb_pf_map_pci_bar_space(struct dlb *dlb, struct pci_dev *pdev)
+{
+ dlb->hw.func_kva = pcim_iomap_table(pdev)[DLB_FUNC_BAR];
+ dlb->hw.func_phys_addr = pci_resource_start(pdev, DLB_FUNC_BAR);
+
+ if (!dlb->hw.func_kva) {
+ dev_err(&pdev->dev, "Cannot iomap BAR 0 (size %llu)\n",
+ pci_resource_len(pdev, 0));
+
+ return -EIO;
+ }
+
+ dlb->hw.csr_kva = pcim_iomap_table(pdev)[DLB_CSR_BAR];
+ dlb->hw.csr_phys_addr = pci_resource_start(pdev, DLB_CSR_BAR);
+
+ if (!dlb->hw.csr_kva) {
+ dev_err(&pdev->dev, "Cannot iomap BAR 2 (size %llu)\n",
+ pci_resource_len(pdev, 2));
+
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/********************************/
+/****** DLB PF Device Ops ******/
+/********************************/
+
+struct dlb_device_ops dlb_pf_ops = {
+ .map_pci_bar_space = dlb_pf_map_pci_bar_space,
+ .unmap_pci_bar_space = dlb_pf_unmap_pci_bar_space,
+};
--
2.17.1
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