// SPDX-License-Identifier: GPL-2.0 /* * uio_hv_generic - generic UIO driver for VMBus * * Copyright (c) 2013-2016 Brocade Communications Systems, Inc. * Copyright (c) 2016, Microsoft Corporation. * * Since the driver does not declare any device ids, you must allocate * id and bind the device to the driver yourself. For example: * * Associate Network GUID with UIO device * # echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" \ * > /sys/bus/vmbus/drivers/uio_hv_generic/new_id * Then rebind * # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \ * > /sys/bus/vmbus/drivers/hv_netvsc/unbind * # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \ * > /sys/bus/vmbus/drivers/uio_hv_generic/bind */ #define pr_fmt(fmt) … #include <linux/device.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/uio_driver.h> #include <linux/netdevice.h> #include <linux/if_ether.h> #include <linux/skbuff.h> #include <linux/hyperv.h> #include <linux/vmalloc.h> #include <linux/slab.h> #include "../hv/hyperv_vmbus.h" #define DRIVER_VERSION … #define DRIVER_AUTHOR … #define DRIVER_DESC … #define SEND_BUFFER_SIZE … #define RECV_BUFFER_SIZE … /* * List of resources to be mapped to user space * can be extended up to MAX_UIO_MAPS(5) items */ enum hv_uio_map { … }; struct hv_uio_private_data { … }; /* * This is the irqcontrol callback to be registered to uio_info. * It can be used to disable/enable interrupt from user space processes. * * @param info * pointer to uio_info. * @param irq_state * state value. 1 to enable interrupt, 0 to disable interrupt. */ static int hv_uio_irqcontrol(struct uio_info *info, s32 irq_state) { … } /* * Callback from vmbus_event when something is in inbound ring. */ static void hv_uio_channel_cb(void *context) { … } /* * Callback from vmbus_event when channel is rescinded. */ static void hv_uio_rescind(struct vmbus_channel *channel) { … } /* Sysfs API to allow mmap of the ring buffers * The ring buffer is allocated as contiguous memory by vmbus_open */ static int hv_uio_ring_mmap(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, struct vm_area_struct *vma) { … } static const struct bin_attribute ring_buffer_bin_attr = …; /* Callback from VMBUS subsystem when new channel created. */ static void hv_uio_new_channel(struct vmbus_channel *new_sc) { … } /* free the reserved buffers for send and receive */ static void hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata) { … } /* VMBus primary channel is opened on first use */ static int hv_uio_open(struct uio_info *info, struct inode *inode) { … } /* VMBus primary channel is closed on last close */ static int hv_uio_release(struct uio_info *info, struct inode *inode) { … } static int hv_uio_probe(struct hv_device *dev, const struct hv_vmbus_device_id *dev_id) { … } static void hv_uio_remove(struct hv_device *dev) { … } static struct hv_driver hv_uio_drv = …; static int __init hyperv_module_init(void) { … } static void __exit hyperv_module_exit(void) { … } module_init(…) …; module_exit(hyperv_module_exit); MODULE_VERSION(…); MODULE_LICENSE(…) …; MODULE_AUTHOR(…); MODULE_DESCRIPTION(…);
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