[linux-2.6-block.git] / drivers / uio / uio_hv_generic.c

// 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) 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	"0.02.1"
#define DRIVER_AUTHOR	"Stephen Hemminger <sthemmin at microsoft.com>"
#define DRIVER_DESC	"Generic UIO driver for VMBus devices"

#define SEND_BUFFER_SIZE (16 * 1024 * 1024)
#define RECV_BUFFER_SIZE (31 * 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;
	atomic_t refcnt;

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

	void	*send_buf;
	struct vmbus_gpadl 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();

	if (!dev->channel->offermsg.monitor_allocated && irq_state)
		vmbus_setevent(dev->channel);

	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);
	void *ring_buffer = page_address(channel->ringbuffer_page);

	if (channel->state != CHANNEL_OPENED_STATE)
		return -ENODEV;

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

static const struct bin_attribute ring_buffer_bin_attr = {
	.attr = {
		.name = "ring",
		.mode = 0600,
	},
	.size = 2 * SZ_2M,
	.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 = SZ_2M;
	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);
	}
}

/* free the reserved buffers for send and receive */
static void
hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
{
	if (pdata->send_gpadl.gpadl_handle) {
		vmbus_teardown_gpadl(dev->channel, &pdata->send_gpadl);
		if (!pdata->send_gpadl.decrypted)
			vfree(pdata->send_buf);
	}

	if (pdata->recv_gpadl.gpadl_handle) {
		vmbus_teardown_gpadl(dev->channel, &pdata->recv_gpadl);
		if (!pdata->recv_gpadl.decrypted)
			vfree(pdata->recv_buf);
	}
}

/* VMBus primary channel is opened on first use */
static int
hv_uio_open(struct uio_info *info, struct inode *inode)
{
	struct hv_uio_private_data *pdata
		= container_of(info, struct hv_uio_private_data, info);
	struct hv_device *dev = pdata->device;
	int ret;

	if (atomic_inc_return(&pdata->refcnt) != 1)
		return 0;

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

	ret = vmbus_connect_ring(dev->channel,
				 hv_uio_channel_cb, dev->channel);
	if (ret == 0)
		dev->channel->inbound.ring_buffer->interrupt_mask = 1;
	else
		atomic_dec(&pdata->refcnt);

	return ret;
}

/* VMBus primary channel is closed on last close */
static int
hv_uio_release(struct uio_info *info, struct inode *inode)
{
	struct hv_uio_private_data *pdata
		= container_of(info, struct hv_uio_private_data, info);
	struct hv_device *dev = pdata->device;
	int ret = 0;

	if (atomic_dec_and_test(&pdata->refcnt))
		ret = vmbus_disconnect_ring(dev->channel);

	return ret;
}

static int
hv_uio_probe(struct hv_device *dev,
	     const struct hv_vmbus_device_id *dev_id)
{
	struct vmbus_channel *channel = dev->channel;
	struct hv_uio_private_data *pdata;
	void *ring_buffer;
	int ret;
	size_t ring_size = hv_dev_ring_size(channel);

	if (!ring_size)
		ring_size = SZ_2M;

	pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	ret = vmbus_alloc_ring(channel, ring_size, ring_size);
	if (ret)
		return ret;

	set_channel_read_mode(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.open = hv_uio_open;
	pdata->info.release = hv_uio_release;
	pdata->info.irq = UIO_IRQ_CUSTOM;
	atomic_set(&pdata->refcnt, 0);

	/* mem resources */
	pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
	ring_buffer = page_address(channel->ringbuffer_page);
	pdata->info.mem[TXRX_RING_MAP].addr
		= (uintptr_t)virt_to_phys(ring_buffer);
	pdata->info.mem[TXRX_RING_MAP].size
		= channel->ringbuffer_pagecount << PAGE_SHIFT;
	pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_IOVA;

	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_free_ring;
	}

	ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
				    RECV_BUFFER_SIZE, &pdata->recv_gpadl);
	if (ret) {
		if (!pdata->recv_gpadl.decrypted)
			vfree(pdata->recv_buf);
		goto fail_close;
	}

	/* put Global Physical Address Label in name */
	snprintf(pdata->recv_name, sizeof(pdata->recv_name),
		 "recv:%u", pdata->recv_gpadl.gpadl_handle);
	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(channel, pdata->send_buf,
				    SEND_BUFFER_SIZE, &pdata->send_gpadl);
	if (ret) {
		if (!pdata->send_gpadl.decrypted)
			vfree(pdata->send_buf);
		goto fail_close;
	}

	snprintf(pdata->send_name, sizeof(pdata->send_name),
		 "send:%u", pdata->send_gpadl.gpadl_handle);
	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;
	}

	ret = sysfs_create_bin_file(&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);
fail_free_ring:
	vmbus_free_ring(dev->channel);

	return ret;
}

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

	if (!pdata)
		return;

	sysfs_remove_bin_file(&dev->channel->kobj, &ring_buffer_bin_attr);
	uio_unregister_device(&pdata->info);
	hv_uio_cleanup(dev, pdata);

	vmbus_free_ring(dev->channel);
}

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
bce5c2ea	1	// SPDX-License-Identifier: GPL-2.0
95096f2f SH	2	/*
	3	* uio_hv_generic - generic UIO driver for VMBus
	4	*
	5	* Copyright (c) 2013-2016 Brocade Communications Systems, Inc.
	6	* Copyright (c) 2016, Microsoft Corporation.
	7	*
95096f2f SH	8	* Since the driver does not declare any device ids, you must allocate
	9	* id and bind the device to the driver yourself. For example:
	10	*
42896968	11	* Associate Network GUID with UIO device
95096f2f	12	* # echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" \
42896968 SH	13	* > /sys/bus/vmbus/drivers/uio_hv_generic/new_id
	14	* Then rebind
	15	* # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
95096f2f	16	* > /sys/bus/vmbus/drivers/hv_netvsc/unbind
42896968	17	* # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \
95096f2f SH	18	* > /sys/bus/vmbus/drivers/uio_hv_generic/bind
95096f2f SH	19	*/
95096f2f SH	20	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	21
	22	#include <linux/device.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/uio_driver.h>
	26	#include <linux/netdevice.h>
	27	#include <linux/if_ether.h>
	28	#include <linux/skbuff.h>
	29	#include <linux/hyperv.h>
	30	#include <linux/vmalloc.h>
	31	#include <linux/slab.h>
	32
	33	#include "../hv/hyperv_vmbus.h"
	34
108ddb8f	35	#define DRIVER_VERSION "0.02.1"
95096f2f SH	36	#define DRIVER_AUTHOR "Stephen Hemminger <sthemmin at microsoft.com>"
	37	#define DRIVER_DESC "Generic UIO driver for VMBus devices"
	38
108ddb8f SH	39	#define SEND_BUFFER_SIZE (16 * 1024 * 1024)
108ddb8f SH	40	#define RECV_BUFFER_SIZE (31 * 1024 * 1024)
e7d21464	41
95096f2f SH	42	/*
	43	* List of resources to be mapped to user space
	44	* can be extended up to MAX_UIO_MAPS(5) items
	45	*/
	46	enum hv_uio_map {
	47	TXRX_RING_MAP = 0,
	48	INT_PAGE_MAP,
	49	MON_PAGE_MAP,
e7d21464 SH	50	RECV_BUF_MAP,
e7d21464 SH	51	SEND_BUF_MAP
95096f2f SH	52	};
95096f2f SH	53
95096f2f SH	54	struct hv_uio_private_data {
	55	struct uio_info info;
	56	struct hv_device *device;
cdfa835c	57	atomic_t refcnt;
e7d21464 SH	58
e7d21464 SH	59	void *recv_buf;
d4dccf35	60	struct vmbus_gpadl recv_gpadl;
e7d21464 SH	61	char recv_name[32]; /* "recv_4294967295" */
	62
	63	void *send_buf;
d4dccf35	64	struct vmbus_gpadl send_gpadl;
e7d21464	65	char send_name[32];
95096f2f SH	66	};
95096f2f SH	67
95096f2f SH	68	/*
	69	* This is the irqcontrol callback to be registered to uio_info.
	70	* It can be used to disable/enable interrupt from user space processes.
	71	*
	72	* @param info
	73	* pointer to uio_info.
	74	* @param irq_state
	75	* state value. 1 to enable interrupt, 0 to disable interrupt.
	76	*/
	77	static int
	78	hv_uio_irqcontrol(struct uio_info *info, s32 irq_state)
	79	{
	80	struct hv_uio_private_data *pdata = info->priv;
	81	struct hv_device *dev = pdata->device;
	82
	83	dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state;
	84	virt_mb();
	85
547fa4ff SS	86	if (!dev->channel->offermsg.monitor_allocated && irq_state)
	87	vmbus_setevent(dev->channel);
	88
95096f2f SH	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);
52a42c2a	134	void *ring_buffer = page_address(channel->ringbuffer_page);
37b96a49	135
cdfa835c SH	136	if (channel->state != CHANNEL_OPENED_STATE)
cdfa835c SH	137	return -ENODEV;
37b96a49	138
52a42c2a	139	return vm_iomap_memory(vma, virt_to_phys(ring_buffer),
ce3d1536	140	channel->ringbuffer_pagecount << PAGE_SHIFT);
37b96a49 SH	141	}
37b96a49 SH	142
6e3d66b8	143	static const struct bin_attribute ring_buffer_bin_attr = {
37b96a49 SH	144	.attr = {
	145	.name = "ring",
	146	.mode = 0600,
37b96a49	147	},
76457f9a	148	.size = 2 * SZ_2M,
37b96a49 SH	149	.mmap = hv_uio_ring_mmap,
	150	};
	151
135db384	152	/* Callback from VMBUS subsystem when new channel created. */
37b96a49 SH	153	static void
	154	hv_uio_new_channel(struct vmbus_channel *new_sc)
	155	{
	156	struct hv_device *hv_dev = new_sc->primary_channel->device_obj;
	157	struct device *device = &hv_dev->device;
76457f9a	158	const size_t ring_bytes = SZ_2M;
37b96a49 SH	159	int ret;
	160
	161	/* Create host communication ring */
	162	ret = vmbus_open(new_sc, ring_bytes, ring_bytes, NULL, 0,
135db384	163	hv_uio_channel_cb, new_sc);
37b96a49 SH	164	if (ret) {
	165	dev_err(device, "vmbus_open subchannel failed: %d\n", ret);
	166	return;
	167	}
	168
	169	/* Disable interrupts on sub channel */
	170	new_sc->inbound.ring_buffer->interrupt_mask = 1;
	171	set_channel_read_mode(new_sc, HV_CALL_ISR);
	172
	173	ret = sysfs_create_bin_file(&new_sc->kobj, &ring_buffer_bin_attr);
	174	if (ret) {
	175	dev_err(device, "sysfs create ring bin file failed; %d\n", ret);
	176	vmbus_close(new_sc);
	177	}
	178	}
	179
cdfa835c	180	/* free the reserved buffers for send and receive */
e7d21464 SH	181	static void
	182	hv_uio_cleanup(struct hv_device dev, struct hv_uio_private_data pdata)
	183	{
d4dccf35 TL	184	if (pdata->send_gpadl.gpadl_handle) {
d4dccf35 TL	185	vmbus_teardown_gpadl(dev->channel, &pdata->send_gpadl);
3d788b2f RE	186	if (!pdata->send_gpadl.decrypted)
3d788b2f RE	187	vfree(pdata->send_buf);
cdfa835c	188	}
e7d21464	189
d4dccf35 TL	190	if (pdata->recv_gpadl.gpadl_handle) {
d4dccf35 TL	191	vmbus_teardown_gpadl(dev->channel, &pdata->recv_gpadl);
3d788b2f RE	192	if (!pdata->recv_gpadl.decrypted)
3d788b2f RE	193	vfree(pdata->recv_buf);
cdfa835c SH	194	}
	195	}
	196
	197	/* VMBus primary channel is opened on first use */
	198	static int
	199	hv_uio_open(struct uio_info info, struct inode inode)
	200	{
	201	struct hv_uio_private_data *pdata
	202	= container_of(info, struct hv_uio_private_data, info);
	203	struct hv_device *dev = pdata->device;
	204	int ret;
	205
	206	if (atomic_inc_return(&pdata->refcnt) != 1)
	207	return 0;
	208
5e3c420d SH	209	vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
	210	vmbus_set_sc_create_callback(dev->channel, hv_uio_new_channel);
	211
cdfa835c SH	212	ret = vmbus_connect_ring(dev->channel,
cdfa835c SH	213	hv_uio_channel_cb, dev->channel);
cdfa835c SH	214	if (ret == 0)
	215	dev->channel->inbound.ring_buffer->interrupt_mask = 1;
	216	else
	217	atomic_dec(&pdata->refcnt);
	218
	219	return ret;
	220	}
	221
	222	/* VMBus primary channel is closed on last close */
	223	static int
	224	hv_uio_release(struct uio_info info, struct inode inode)
	225	{
	226	struct hv_uio_private_data *pdata
	227	= container_of(info, struct hv_uio_private_data, info);
	228	struct hv_device *dev = pdata->device;
	229	int ret = 0;
	230
	231	if (atomic_dec_and_test(&pdata->refcnt))
	232	ret = vmbus_disconnect_ring(dev->channel);
	233
	234	return ret;
e7d21464 SH	235	}
e7d21464 SH	236
95096f2f SH	237	static int
	238	hv_uio_probe(struct hv_device *dev,
	239	const struct hv_vmbus_device_id *dev_id)
	240	{
cdfa835c	241	struct vmbus_channel *channel = dev->channel;
95096f2f	242	struct hv_uio_private_data *pdata;
cdfa835c	243	void *ring_buffer;
95096f2f	244	int ret;
e566ed5b	245	size_t ring_size = hv_dev_ring_size(channel);
95096f2f	246
e566ed5b	247	if (!ring_size)
76457f9a	248	ring_size = SZ_2M;
e566ed5b	249
74e71964	250	pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
95096f2f SH	251	if (!pdata)
	252	return -ENOMEM;
	253
e566ed5b	254	ret = vmbus_alloc_ring(channel, ring_size, ring_size);
95096f2f	255	if (ret)
74e71964	256	return ret;
95096f2f	257
cdfa835c	258	set_channel_read_mode(channel, HV_CALL_ISR);
95096f2f SH	259
	260	/* Fill general uio info */
	261	pdata->info.name = "uio_hv_generic";
	262	pdata->info.version = DRIVER_VERSION;
	263	pdata->info.irqcontrol = hv_uio_irqcontrol;
cdfa835c SH	264	pdata->info.open = hv_uio_open;
cdfa835c SH	265	pdata->info.release = hv_uio_release;
95096f2f	266	pdata->info.irq = UIO_IRQ_CUSTOM;
cdfa835c	267	atomic_set(&pdata->refcnt, 0);
95096f2f SH	268
	269	/* mem resources */
	270	pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
cdfa835c	271	ring_buffer = page_address(channel->ringbuffer_page);
95096f2f	272	pdata->info.mem[TXRX_RING_MAP].addr
cdfa835c	273	= (uintptr_t)virt_to_phys(ring_buffer);
95096f2f	274	pdata->info.mem[TXRX_RING_MAP].size
cdfa835c	275	= channel->ringbuffer_pagecount << PAGE_SHIFT;
9da197f1	276	pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_IOVA;
95096f2f SH	277
95096f2f SH	278	pdata->info.mem[INT_PAGE_MAP].name = "int_page";
9c40546c	279	pdata->info.mem[INT_PAGE_MAP].addr
72d14657	280	= (uintptr_t)vmbus_connection.int_page;
95096f2f SH	281	pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE;
	282	pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
	283
9c40546c SH	284	pdata->info.mem[MON_PAGE_MAP].name = "monitor_page";
9c40546c SH	285	pdata->info.mem[MON_PAGE_MAP].addr
72d14657	286	= (uintptr_t)vmbus_connection.monitor_pages[1];
95096f2f SH	287	pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
	288	pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
	289
e7d21464 SH	290	pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
	291	if (pdata->recv_buf == NULL) {
	292	ret = -ENOMEM;
0b0226be	293	goto fail_free_ring;
e7d21464 SH	294	}
e7d21464 SH	295
cdfa835c	296	ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
e7d21464	297	RECV_BUFFER_SIZE, &pdata->recv_gpadl);
3ee098f9	298	if (ret) {
3d788b2f RE	299	if (!pdata->recv_gpadl.decrypted)
3d788b2f RE	300	vfree(pdata->recv_buf);
e7d21464	301	goto fail_close;
3ee098f9	302	}
e7d21464 SH	303
	304	/* put Global Physical Address Label in name */
	305	snprintf(pdata->recv_name, sizeof(pdata->recv_name),
d4dccf35	306	"recv:%u", pdata->recv_gpadl.gpadl_handle);
e7d21464 SH	307	pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
e7d21464 SH	308	pdata->info.mem[RECV_BUF_MAP].addr
d6088e9a	309	= (uintptr_t)pdata->recv_buf;
e7d21464 SH	310	pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
	311	pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
	312
e7d21464 SH	313	pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
	314	if (pdata->send_buf == NULL) {
	315	ret = -ENOMEM;
	316	goto fail_close;
	317	}
	318
cdfa835c	319	ret = vmbus_establish_gpadl(channel, pdata->send_buf,
e7d21464	320	SEND_BUFFER_SIZE, &pdata->send_gpadl);
3ee098f9	321	if (ret) {
3d788b2f RE	322	if (!pdata->send_gpadl.decrypted)
3d788b2f RE	323	vfree(pdata->send_buf);
e7d21464	324	goto fail_close;
3ee098f9	325	}
e7d21464 SH	326
e7d21464 SH	327	snprintf(pdata->send_name, sizeof(pdata->send_name),
d4dccf35	328	"send:%u", pdata->send_gpadl.gpadl_handle);
e7d21464 SH	329	pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
e7d21464 SH	330	pdata->info.mem[SEND_BUF_MAP].addr
d6088e9a	331	= (uintptr_t)pdata->send_buf;
e7d21464 SH	332	pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
	333	pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
	334
95096f2f SH	335	pdata->info.priv = pdata;
	336	pdata->device = dev;
	337
	338	ret = uio_register_device(&dev->device, &pdata->info);
	339	if (ret) {
	340	dev_err(&dev->device, "hv_uio register failed\n");
	341	goto fail_close;
	342	}
	343
cdfa835c	344	ret = sysfs_create_bin_file(&channel->kobj, &ring_buffer_bin_attr);
9ab877a6 SH	345	if (ret)
	346	dev_notice(&dev->device,
	347	"sysfs create ring bin file failed; %d\n", ret);
	348
95096f2f SH	349	hv_set_drvdata(dev, pdata);
	350
	351	return 0;
	352
	353	fail_close:
e7d21464	354	hv_uio_cleanup(dev, pdata);
0b0226be CJ	355	fail_free_ring:
0b0226be CJ	356	vmbus_free_ring(dev->channel);
95096f2f SH	357
	358	return ret;
	359	}
	360
96ec2939	361	static void
95096f2f SH	362	hv_uio_remove(struct hv_device *dev)
	363	{
	364	struct hv_uio_private_data *pdata = hv_get_drvdata(dev);
	365
	366	if (!pdata)
96ec2939	367	return;
95096f2f	368
7066c2f6	369	sysfs_remove_bin_file(&dev->channel->kobj, &ring_buffer_bin_attr);
95096f2f	370	uio_unregister_device(&pdata->info);
e7d21464	371	hv_uio_cleanup(dev, pdata);
cdfa835c SH	372
cdfa835c SH	373	vmbus_free_ring(dev->channel);
95096f2f SH	374	}
	375
	376	static struct hv_driver hv_uio_drv = {
	377	.name = "uio_hv_generic",
	378	.id_table = NULL, /* only dynamic id's */
	379	.probe = hv_uio_probe,
	380	.remove = hv_uio_remove,
	381	};
	382
	383	static int __init
	384	hyperv_module_init(void)
	385	{
	386	return vmbus_driver_register(&hv_uio_drv);
	387	}
	388
	389	static void __exit
	390	hyperv_module_exit(void)
	391	{
	392	vmbus_driver_unregister(&hv_uio_drv);
	393	}
	394
	395	module_init(hyperv_module_init);
	396	module_exit(hyperv_module_exit);
	397
	398	MODULE_VERSION(DRIVER_VERSION);
	399	MODULE_LICENSE("GPL v2");
	400	MODULE_AUTHOR(DRIVER_AUTHOR);
	401	MODULE_DESCRIPTION(DRIVER_DESC);