[mirror_ubuntu-hirsute-kernel.git] / drivers / uio / uio_hv_generic.c

/*
 * uio_hv_generic - generic UIO driver for VMBus
 *
 * Copyright (c) 2013-2016 Brocade Communications Systems, Inc.
 * Copyright (c) 2016, Microsoft Corporation.
 *
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 * 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 DEBUG 1
#define pr_fmt(fmt) KBUILD_MODNAME ": " 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	"0.02.0"
#define DRIVER_AUTHOR	"Stephen Hemminger <sthemmin at microsoft.com>"
#define DRIVER_DESC	"Generic UIO driver for VMBus devices"

#define HV_RING_SIZE	 512	/* pages */
#define SEND_BUFFER_SIZE (15 * 1024 * 1024)
#define RECV_BUFFER_SIZE (15 * 1024 * 1024)

/*
 * List of resources to be mapped to user space
 * can be extended up to MAX_UIO_MAPS(5) items
 */
enum hv_uio_map {
	TXRX_RING_MAP = 0,
	INT_PAGE_MAP,
	MON_PAGE_MAP,
	RECV_BUF_MAP,
	SEND_BUF_MAP
};

struct hv_uio_private_data {
	struct uio_info info;
	struct hv_device *device;

	void	*recv_buf;
	u32	recv_gpadl;
	char	recv_name[32];	/* "recv_4294967295" */

	void	*send_buf;
	u32	send_gpadl;
	char	send_name[32];
};

/*
 * 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)
{
	struct hv_uio_private_data *pdata = info->priv;
	struct hv_device *dev = pdata->device;

	dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state;
	virt_mb();

	return 0;
}

/*
 * Callback from vmbus_event when something is in inbound ring.
 */
static void hv_uio_channel_cb(void *context)
{
	struct vmbus_channel *chan = context;
	struct hv_device *hv_dev = chan->device_obj;
	struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);

	chan->inbound.ring_buffer->interrupt_mask = 1;
	virt_mb();

	uio_event_notify(&pdata->info);
}

/*
 * Callback from vmbus_event when channel is rescinded.
 */
static void hv_uio_rescind(struct vmbus_channel *channel)
{
	struct hv_device *hv_dev = channel->primary_channel->device_obj;
	struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);

	/*
	 * Turn off the interrupt file handle
	 * Next read for event will return -EIO
	 */
	pdata->info.irq = 0;

	/* Wake up reader */
	uio_event_notify(&pdata->info);
}

/* 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)
{
	struct vmbus_channel *channel
		= container_of(kobj, struct vmbus_channel, kobj);
	struct hv_device *dev = channel->primary_channel->device_obj;
	u16 q_idx = channel->offermsg.offer.sub_channel_index;

	dev_dbg(&dev->device, "mmap channel %u pages %#lx at %#lx\n",
		q_idx, vma_pages(vma), vma->vm_pgoff);

	return vm_iomap_memory(vma, virt_to_phys(channel->ringbuffer_pages),
			       channel->ringbuffer_pagecount << PAGE_SHIFT);
}

static const struct bin_attribute ring_buffer_bin_attr = {
	.attr = {
		.name = "ring",
		.mode = 0600,
	},
	.size = 2 * HV_RING_SIZE * PAGE_SIZE,
	.mmap = hv_uio_ring_mmap,
};

/* Callback from VMBUS subsystem when new channel created. */
static void
hv_uio_new_channel(struct vmbus_channel *new_sc)
{
	struct hv_device *hv_dev = new_sc->primary_channel->device_obj;
	struct device *device = &hv_dev->device;
	const size_t ring_bytes = HV_RING_SIZE * PAGE_SIZE;
	int ret;

	/* Create host communication ring */
	ret = vmbus_open(new_sc, ring_bytes, ring_bytes, NULL, 0,
			 hv_uio_channel_cb, new_sc);
	if (ret) {
		dev_err(device, "vmbus_open subchannel failed: %d\n", ret);
		return;
	}

	/* Disable interrupts on sub channel */
	new_sc->inbound.ring_buffer->interrupt_mask = 1;
	set_channel_read_mode(new_sc, HV_CALL_ISR);

	ret = sysfs_create_bin_file(&new_sc->kobj, &ring_buffer_bin_attr);
	if (ret) {
		dev_err(device, "sysfs create ring bin file failed; %d\n", ret);
		vmbus_close(new_sc);
	}
}

static void
hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
{
	if (pdata->send_gpadl)
		vmbus_teardown_gpadl(dev->channel, pdata->send_gpadl);
	vfree(pdata->send_buf);

	if (pdata->recv_gpadl)
		vmbus_teardown_gpadl(dev->channel, pdata->recv_gpadl);
	vfree(pdata->recv_buf);
}

static int
hv_uio_probe(struct hv_device *dev,
	     const struct hv_vmbus_device_id *dev_id)
{
	struct hv_uio_private_data *pdata;
	int ret;

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	ret = vmbus_open(dev->channel, HV_RING_SIZE * PAGE_SIZE,
			 HV_RING_SIZE * PAGE_SIZE, NULL, 0,
			 hv_uio_channel_cb, dev->channel);
	if (ret)
		goto fail;

	/* Communicating with host has to be via shared memory not hypercall */
	if (!dev->channel->offermsg.monitor_allocated) {
		dev_err(&dev->device, "vmbus channel requires hypercall\n");
		ret = -ENOTSUPP;
		goto fail_close;
	}

	dev->channel->inbound.ring_buffer->interrupt_mask = 1;
	set_channel_read_mode(dev->channel, HV_CALL_ISR);

	/* Fill general uio info */
	pdata->info.name = "uio_hv_generic";
	pdata->info.version = DRIVER_VERSION;
	pdata->info.irqcontrol = hv_uio_irqcontrol;
	pdata->info.irq = UIO_IRQ_CUSTOM;

	/* mem resources */
	pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
	pdata->info.mem[TXRX_RING_MAP].addr
		= (uintptr_t)dev->channel->ringbuffer_pages;
	pdata->info.mem[TXRX_RING_MAP].size
		= dev->channel->ringbuffer_pagecount << PAGE_SHIFT;
	pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL;

	pdata->info.mem[INT_PAGE_MAP].name = "int_page";
	pdata->info.mem[INT_PAGE_MAP].addr
		= (uintptr_t)vmbus_connection.int_page;
	pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE;
	pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL;

	pdata->info.mem[MON_PAGE_MAP].name = "monitor_page";
	pdata->info.mem[MON_PAGE_MAP].addr
		= (uintptr_t)vmbus_connection.monitor_pages[1];
	pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
	pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;

	pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
	if (pdata->recv_buf == NULL) {
		ret = -ENOMEM;
		goto fail_close;
	}

	ret = vmbus_establish_gpadl(dev->channel, pdata->recv_buf,
				    RECV_BUFFER_SIZE, &pdata->recv_gpadl);
	if (ret)
		goto fail_close;

	/* put Global Physical Address Label in name */
	snprintf(pdata->recv_name, sizeof(pdata->recv_name),
		 "recv:%u", pdata->recv_gpadl);
	pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
	pdata->info.mem[RECV_BUF_MAP].addr
		= (uintptr_t)pdata->recv_buf;
	pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
	pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;


	pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
	if (pdata->send_buf == NULL) {
		ret = -ENOMEM;
		goto fail_close;
	}

	ret = vmbus_establish_gpadl(dev->channel, pdata->send_buf,
				    SEND_BUFFER_SIZE, &pdata->send_gpadl);
	if (ret)
		goto fail_close;

	snprintf(pdata->send_name, sizeof(pdata->send_name),
		 "send:%u", pdata->send_gpadl);
	pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
	pdata->info.mem[SEND_BUF_MAP].addr
		= (uintptr_t)pdata->send_buf;
	pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
	pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;

	pdata->info.priv = pdata;
	pdata->device = dev;

	ret = uio_register_device(&dev->device, &pdata->info);
	if (ret) {
		dev_err(&dev->device, "hv_uio register failed\n");
		goto fail_close;
	}

	vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
	vmbus_set_sc_create_callback(dev->channel, hv_uio_new_channel);

	ret = sysfs_create_bin_file(&dev->channel->kobj, &ring_buffer_bin_attr);
	if (ret)
		dev_notice(&dev->device,
			   "sysfs create ring bin file failed; %d\n", ret);

	hv_set_drvdata(dev, pdata);

	return 0;

fail_close:
	hv_uio_cleanup(dev, pdata);
	vmbus_close(dev->channel);
fail:
	kfree(pdata);

	return ret;
}

static int
hv_uio_remove(struct hv_device *dev)
{
	struct hv_uio_private_data *pdata = hv_get_drvdata(dev);

	if (!pdata)
		return 0;

	uio_unregister_device(&pdata->info);
	hv_uio_cleanup(dev, pdata);
	hv_set_drvdata(dev, NULL);
	vmbus_close(dev->channel);
	kfree(pdata);
	return 0;
}

static struct hv_driver hv_uio_drv = {
	.name = "uio_hv_generic",
	.id_table = NULL, /* only dynamic id's */
	.probe = hv_uio_probe,
	.remove = hv_uio_remove,
};

static int __init
hyperv_module_init(void)
{
	return vmbus_driver_register(&hv_uio_drv);
}

static void __exit
hyperv_module_exit(void)
{
	vmbus_driver_unregister(&hv_uio_drv);
}

module_init(hyperv_module_init);
module_exit(hyperv_module_exit);

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
95096f2f SH	1	/*
	2	* uio_hv_generic - generic UIO driver for VMBus
	3	*
	4	* Copyright (c) 2013-2016 Brocade Communications Systems, Inc.
	5	* Copyright (c) 2016, Microsoft Corporation.
	6	*
	7	*
	8	* This work is licensed under the terms of the GNU GPL, version 2.
	9	*
	10	* Since the driver does not declare any device ids, you must allocate
	11	* id and bind the device to the driver yourself. For example:
	12	*
42896968	13	* Associate Network GUID with UIO device
95096f2f	14	* # echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" \
42896968 SH	15	* > /sys/bus/vmbus/drivers/uio_hv_generic/new_id
	16	* Then rebind
	17	* # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
95096f2f	18	* > /sys/bus/vmbus/drivers/hv_netvsc/unbind
42896968	19	* # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
95096f2f SH	20	* > /sys/bus/vmbus/drivers/uio_hv_generic/bind
95096f2f SH	21	*/
ce3d1536	22	#define DEBUG 1
95096f2f SH	23	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	24
	25	#include <linux/device.h>
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/uio_driver.h>
	29	#include <linux/netdevice.h>
	30	#include <linux/if_ether.h>
	31	#include <linux/skbuff.h>
	32	#include <linux/hyperv.h>
	33	#include <linux/vmalloc.h>
	34	#include <linux/slab.h>
	35
	36	#include "../hv/hyperv_vmbus.h"
	37
	38	#define DRIVER_VERSION "0.02.0"
	39	#define DRIVER_AUTHOR "Stephen Hemminger <sthemmin at microsoft.com>"
	40	#define DRIVER_DESC "Generic UIO driver for VMBus devices"
	41
e7d21464 SH	42	#define HV_RING_SIZE 512 /* pages */
	43	#define SEND_BUFFER_SIZE (15 * 1024 * 1024)
	44	#define RECV_BUFFER_SIZE (15 * 1024 * 1024)
	45
95096f2f SH	46	/*
	47	* List of resources to be mapped to user space
	48	* can be extended up to MAX_UIO_MAPS(5) items
	49	*/
	50	enum hv_uio_map {
	51	TXRX_RING_MAP = 0,
	52	INT_PAGE_MAP,
	53	MON_PAGE_MAP,
e7d21464 SH	54	RECV_BUF_MAP,
e7d21464 SH	55	SEND_BUF_MAP
95096f2f SH	56	};
95096f2f SH	57
95096f2f SH	58	struct hv_uio_private_data {
	59	struct uio_info info;
	60	struct hv_device *device;
e7d21464 SH	61
	62	void *recv_buf;
	63	u32 recv_gpadl;
	64	char recv_name[32]; /* "recv_4294967295" */
	65
	66	void *send_buf;
	67	u32 send_gpadl;
	68	char send_name[32];
95096f2f SH	69	};
95096f2f SH	70
95096f2f SH	71	/*
	72	* This is the irqcontrol callback to be registered to uio_info.
	73	* It can be used to disable/enable interrupt from user space processes.
	74	*
	75	* @param info
	76	* pointer to uio_info.
	77	* @param irq_state
	78	* state value. 1 to enable interrupt, 0 to disable interrupt.
	79	*/
	80	static int
	81	hv_uio_irqcontrol(struct uio_info *info, s32 irq_state)
	82	{
	83	struct hv_uio_private_data *pdata = info->priv;
	84	struct hv_device *dev = pdata->device;
	85
	86	dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state;
	87	virt_mb();
	88
	89	return 0;
	90	}
	91
	92	/*
	93	* Callback from vmbus_event when something is in inbound ring.
	94	*/
	95	static void hv_uio_channel_cb(void *context)
	96	{
135db384 SH	97	struct vmbus_channel *chan = context;
	98	struct hv_device *hv_dev = chan->device_obj;
	99	struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);
95096f2f	100
135db384	101	chan->inbound.ring_buffer->interrupt_mask = 1;
95096f2f SH	102	virt_mb();
	103
	104	uio_event_notify(&pdata->info);
	105	}
	106
ca3cda6f SH	107	/*
	108	* Callback from vmbus_event when channel is rescinded.
	109	*/
	110	static void hv_uio_rescind(struct vmbus_channel *channel)
	111	{
	112	struct hv_device *hv_dev = channel->primary_channel->device_obj;
	113	struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);
	114
	115	/*
	116	* Turn off the interrupt file handle
	117	* Next read for event will return -EIO
	118	*/
	119	pdata->info.irq = 0;
	120
	121	/* Wake up reader */
	122	uio_event_notify(&pdata->info);
	123	}
e7d21464	124
ce3d1536 SH	125	/* Sysfs API to allow mmap of the ring buffers
ce3d1536 SH	126	* The ring buffer is allocated as contiguous memory by vmbus_open
37b96a49	127	*/
37b96a49 SH	128	static int hv_uio_ring_mmap(struct file filp, struct kobject kobj,
	129	struct bin_attribute *attr,
	130	struct vm_area_struct *vma)
	131	{
	132	struct vmbus_channel *channel
	133	= container_of(kobj, struct vmbus_channel, kobj);
ce3d1536 SH	134	struct hv_device *dev = channel->primary_channel->device_obj;
ce3d1536 SH	135	u16 q_idx = channel->offermsg.offer.sub_channel_index;
37b96a49	136
ce3d1536 SH	137	dev_dbg(&dev->device, "mmap channel %u pages %#lx at %#lx\n",
ce3d1536 SH	138	q_idx, vma_pages(vma), vma->vm_pgoff);
37b96a49	139
ce3d1536 SH	140	return vm_iomap_memory(vma, virt_to_phys(channel->ringbuffer_pages),
ce3d1536 SH	141	channel->ringbuffer_pagecount << PAGE_SHIFT);
37b96a49 SH	142	}
37b96a49 SH	143
6e3d66b8	144	static const struct bin_attribute ring_buffer_bin_attr = {
37b96a49 SH	145	.attr = {
	146	.name = "ring",
	147	.mode = 0600,
37b96a49	148	},
6e3d66b8	149	.size = 2 * HV_RING_SIZE * PAGE_SIZE,
37b96a49 SH	150	.mmap = hv_uio_ring_mmap,
	151	};
	152
135db384	153	/* Callback from VMBUS subsystem when new channel created. */
37b96a49 SH	154	static void
	155	hv_uio_new_channel(struct vmbus_channel *new_sc)
	156	{
	157	struct hv_device *hv_dev = new_sc->primary_channel->device_obj;
	158	struct device *device = &hv_dev->device;
37b96a49 SH	159	const size_t ring_bytes = HV_RING_SIZE * PAGE_SIZE;
	160	int ret;
	161
	162	/* Create host communication ring */
	163	ret = vmbus_open(new_sc, ring_bytes, ring_bytes, NULL, 0,
135db384	164	hv_uio_channel_cb, new_sc);
37b96a49 SH	165	if (ret) {
	166	dev_err(device, "vmbus_open subchannel failed: %d\n", ret);
	167	return;
	168	}
	169
	170	/* Disable interrupts on sub channel */
	171	new_sc->inbound.ring_buffer->interrupt_mask = 1;
	172	set_channel_read_mode(new_sc, HV_CALL_ISR);
	173
	174	ret = sysfs_create_bin_file(&new_sc->kobj, &ring_buffer_bin_attr);
	175	if (ret) {
	176	dev_err(device, "sysfs create ring bin file failed; %d\n", ret);
	177	vmbus_close(new_sc);
	178	}
	179	}
	180
e7d21464 SH	181	static void
	182	hv_uio_cleanup(struct hv_device dev, struct hv_uio_private_data pdata)
	183	{
	184	if (pdata->send_gpadl)
	185	vmbus_teardown_gpadl(dev->channel, pdata->send_gpadl);
	186	vfree(pdata->send_buf);
	187
	188	if (pdata->recv_gpadl)
	189	vmbus_teardown_gpadl(dev->channel, pdata->recv_gpadl);
	190	vfree(pdata->recv_buf);
	191	}
	192
95096f2f SH	193	static int
	194	hv_uio_probe(struct hv_device *dev,
	195	const struct hv_vmbus_device_id *dev_id)
	196	{
	197	struct hv_uio_private_data *pdata;
	198	int ret;
	199
	200	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	201	if (!pdata)
	202	return -ENOMEM;
	203
	204	ret = vmbus_open(dev->channel, HV_RING_SIZE * PAGE_SIZE,
	205	HV_RING_SIZE * PAGE_SIZE, NULL, 0,
135db384	206	hv_uio_channel_cb, dev->channel);
95096f2f SH	207	if (ret)
	208	goto fail;
	209
06028d15 SH	210	/* Communicating with host has to be via shared memory not hypercall */
	211	if (!dev->channel->offermsg.monitor_allocated) {
	212	dev_err(&dev->device, "vmbus channel requires hypercall\n");
	213	ret = -ENOTSUPP;
	214	goto fail_close;
	215	}
	216
95096f2f	217	dev->channel->inbound.ring_buffer->interrupt_mask = 1;
2141a845	218	set_channel_read_mode(dev->channel, HV_CALL_ISR);
95096f2f SH	219
	220	/* Fill general uio info */
	221	pdata->info.name = "uio_hv_generic";
	222	pdata->info.version = DRIVER_VERSION;
	223	pdata->info.irqcontrol = hv_uio_irqcontrol;
95096f2f SH	224	pdata->info.irq = UIO_IRQ_CUSTOM;
	225
	226	/* mem resources */
	227	pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
	228	pdata->info.mem[TXRX_RING_MAP].addr
72d14657	229	= (uintptr_t)dev->channel->ringbuffer_pages;
95096f2f	230	pdata->info.mem[TXRX_RING_MAP].size
9c40546c	231	= dev->channel->ringbuffer_pagecount << PAGE_SHIFT;
95096f2f SH	232	pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL;
	233
	234	pdata->info.mem[INT_PAGE_MAP].name = "int_page";
9c40546c	235	pdata->info.mem[INT_PAGE_MAP].addr
72d14657	236	= (uintptr_t)vmbus_connection.int_page;
95096f2f SH	237	pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE;
	238	pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
	239
9c40546c SH	240	pdata->info.mem[MON_PAGE_MAP].name = "monitor_page";
9c40546c SH	241	pdata->info.mem[MON_PAGE_MAP].addr
72d14657	242	= (uintptr_t)vmbus_connection.monitor_pages[1];
95096f2f SH	243	pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
	244	pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
	245
e7d21464 SH	246	pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
	247	if (pdata->recv_buf == NULL) {
	248	ret = -ENOMEM;
	249	goto fail_close;
	250	}
	251
	252	ret = vmbus_establish_gpadl(dev->channel, pdata->recv_buf,
	253	RECV_BUFFER_SIZE, &pdata->recv_gpadl);
	254	if (ret)
	255	goto fail_close;
	256
	257	/* put Global Physical Address Label in name */
	258	snprintf(pdata->recv_name, sizeof(pdata->recv_name),
	259	"recv:%u", pdata->recv_gpadl);
	260	pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
	261	pdata->info.mem[RECV_BUF_MAP].addr
d6088e9a	262	= (uintptr_t)pdata->recv_buf;
e7d21464 SH	263	pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
	264	pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
	265
	266
	267	pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
	268	if (pdata->send_buf == NULL) {
	269	ret = -ENOMEM;
	270	goto fail_close;
	271	}
	272
	273	ret = vmbus_establish_gpadl(dev->channel, pdata->send_buf,
	274	SEND_BUFFER_SIZE, &pdata->send_gpadl);
	275	if (ret)
	276	goto fail_close;
	277
	278	snprintf(pdata->send_name, sizeof(pdata->send_name),
	279	"send:%u", pdata->send_gpadl);
	280	pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
	281	pdata->info.mem[SEND_BUF_MAP].addr
d6088e9a	282	= (uintptr_t)pdata->send_buf;
e7d21464 SH	283	pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
	284	pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
	285
95096f2f SH	286	pdata->info.priv = pdata;
	287	pdata->device = dev;
	288
	289	ret = uio_register_device(&dev->device, &pdata->info);
	290	if (ret) {
	291	dev_err(&dev->device, "hv_uio register failed\n");
	292	goto fail_close;
	293	}
	294
ca3cda6f	295	vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
37b96a49	296	vmbus_set_sc_create_callback(dev->channel, hv_uio_new_channel);
ca3cda6f	297
9ab877a6 SH	298	ret = sysfs_create_bin_file(&dev->channel->kobj, &ring_buffer_bin_attr);
	299	if (ret)
	300	dev_notice(&dev->device,
	301	"sysfs create ring bin file failed; %d\n", ret);
	302
95096f2f SH	303	hv_set_drvdata(dev, pdata);
	304
	305	return 0;
	306
	307	fail_close:
e7d21464	308	hv_uio_cleanup(dev, pdata);
95096f2f SH	309	vmbus_close(dev->channel);
	310	fail:
	311	kfree(pdata);
	312
	313	return ret;
	314	}
	315
	316	static int
	317	hv_uio_remove(struct hv_device *dev)
	318	{
	319	struct hv_uio_private_data *pdata = hv_get_drvdata(dev);
	320
	321	if (!pdata)
	322	return 0;
	323
	324	uio_unregister_device(&pdata->info);
e7d21464	325	hv_uio_cleanup(dev, pdata);
95096f2f SH	326	hv_set_drvdata(dev, NULL);
	327	vmbus_close(dev->channel);
	328	kfree(pdata);
	329	return 0;
	330	}
	331
	332	static struct hv_driver hv_uio_drv = {
	333	.name = "uio_hv_generic",
	334	.id_table = NULL, /* only dynamic id's */
	335	.probe = hv_uio_probe,
	336	.remove = hv_uio_remove,
	337	};
	338
	339	static int __init
	340	hyperv_module_init(void)
	341	{
	342	return vmbus_driver_register(&hv_uio_drv);
	343	}
	344
	345	static void __exit
	346	hyperv_module_exit(void)
	347	{
	348	vmbus_driver_unregister(&hv_uio_drv);
	349	}
	350
	351	module_init(hyperv_module_init);
	352	module_exit(hyperv_module_exit);
	353
	354	MODULE_VERSION(DRIVER_VERSION);
	355	MODULE_LICENSE("GPL v2");
	356	MODULE_AUTHOR(DRIVER_AUTHOR);
	357	MODULE_DESCRIPTION(DRIVER_DESC);