[net-next-2.6.git] / drivers / s390 / scsi / zfcp_cfdc.c

/*
 * zfcp device driver
 *
 * Userspace interface for accessing the
 * Access Control Lists / Control File Data Channel
 *
 * Copyright IBM Corporation 2008, 2009
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/types.h>
#include <linux/miscdevice.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
#include "zfcp_def.h"
#include "zfcp_ext.h"
#include "zfcp_fsf.h"

#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL		0x00010001
#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE		0x00010101
#define ZFCP_CFDC_CMND_FULL_ACCESS		0x00000201
#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS	0x00000401
#define ZFCP_CFDC_CMND_UPLOAD			0x00010002

#define ZFCP_CFDC_DOWNLOAD			0x00000001
#define ZFCP_CFDC_UPLOAD			0x00000002
#define ZFCP_CFDC_WITH_CONTROL_FILE		0x00010000

#define ZFCP_CFDC_IOC_MAGIC                     0xDD
#define ZFCP_CFDC_IOC \
	_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)

/**
 * struct zfcp_cfdc_data - data for ioctl cfdc interface
 * @signature: request signature
 * @devno: FCP adapter device number
 * @command: command code
 * @fsf_status: returns status of FSF command to userspace
 * @fsf_status_qual: returned to userspace
 * @payloads: access conflicts list
 * @control_file: access control table
 */
struct zfcp_cfdc_data {
	u32 signature;
	u32 devno;
	u32 command;
	u32 fsf_status;
	u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	u8  payloads[256];
	u8  control_file[0];
};

static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
				    void __user *user_buffer)
{
	unsigned int length;
	unsigned int size = ZFCP_CFDC_MAX_SIZE;

	while (size) {
		length = min((unsigned int)size, sg->length);
		if (copy_from_user(sg_virt(sg++), user_buffer, length))
			return -EFAULT;
		user_buffer += length;
		size -= length;
	}
	return 0;
}

static int zfcp_cfdc_copy_to_user(void __user  *user_buffer,
				  struct scatterlist *sg)
{
	unsigned int length;
	unsigned int size = ZFCP_CFDC_MAX_SIZE;

	while (size) {
		length = min((unsigned int) size, sg->length);
		if (copy_to_user(user_buffer, sg_virt(sg++), length))
			return -EFAULT;
		user_buffer += length;
		size -= length;
	}
	return 0;
}

static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
{
	char busid[9];
	struct ccw_device *cdev;
	struct zfcp_adapter *adapter;

	snprintf(busid, sizeof(busid), "0.0.%04x", devno);
	cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	if (!cdev)
		return NULL;

	adapter = zfcp_ccw_adapter_by_cdev(cdev);

	put_device(&cdev->dev);
	return adapter;
}

static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
{
	switch (command) {
	case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
		fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
		fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
		break;
	case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
		fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
		fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
		break;
	case ZFCP_CFDC_CMND_FULL_ACCESS:
		fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
		fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
		break;
	case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
		fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
		fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
		break;
	case ZFCP_CFDC_CMND_UPLOAD:
		fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
		fsf_cfdc->option = 0;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
			      u8 __user *control_file)
{
	int retval;
	retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
	if (retval)
		return retval;

	sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;

	if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
	    command & ZFCP_CFDC_DOWNLOAD) {
		retval = zfcp_cfdc_copy_from_user(sg, control_file);
		if (retval) {
			zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
			return -EFAULT;
		}
	}

	return 0;
}

static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
				   struct zfcp_fsf_req *req)
{
	data->fsf_status = req->qtcb->header.fsf_status;
	memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
	       sizeof(union fsf_status_qual));
	memcpy(&data->payloads, &req->qtcb->bottom.support.els,
	       sizeof(req->qtcb->bottom.support.els));
}

static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
				unsigned long arg)
{
	struct zfcp_cfdc_data *data;
	struct zfcp_cfdc_data __user *data_user;
	struct zfcp_adapter *adapter;
	struct zfcp_fsf_req *req;
	struct zfcp_fsf_cfdc *fsf_cfdc;
	int retval;

	if (command != ZFCP_CFDC_IOC)
		return -ENOTTY;

	if (is_compat_task())
		data_user = compat_ptr(arg);
	else
		data_user = (void __user *)arg;

	if (!data_user)
		return -EINVAL;

	fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
	if (!fsf_cfdc)
		return -ENOMEM;

	data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
	if (!data) {
		retval = -ENOMEM;
		goto no_mem_sense;
	}

	retval = copy_from_user(data, data_user, sizeof(*data));
	if (retval) {
		retval = -EFAULT;
		goto free_buffer;
	}

	if (data->signature != 0xCFDCACDF) {
		retval = -EINVAL;
		goto free_buffer;
	}

	retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);

	adapter = zfcp_cfdc_get_adapter(data->devno);
	if (!adapter) {
		retval = -ENXIO;
		goto free_buffer;
	}

	retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
				    data_user->control_file);
	if (retval)
		goto adapter_put;
	req = zfcp_fsf_control_file(adapter, fsf_cfdc);
	if (IS_ERR(req)) {
		retval = PTR_ERR(req);
		goto free_sg;
	}

	if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
		retval = -ENXIO;
		goto free_fsf;
	}

	zfcp_cfdc_req_to_sense(data, req);
	retval = copy_to_user(data_user, data, sizeof(*data_user));
	if (retval) {
		retval = -EFAULT;
		goto free_fsf;
	}

	if (data->command & ZFCP_CFDC_UPLOAD)
		retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
						fsf_cfdc->sg);

 free_fsf:
	zfcp_fsf_req_free(req);
 free_sg:
	zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
 adapter_put:
	zfcp_ccw_adapter_put(adapter);
 free_buffer:
	kfree(data);
 no_mem_sense:
	kfree(fsf_cfdc);
	return retval;
}

static const struct file_operations zfcp_cfdc_fops = {
	.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = zfcp_cfdc_dev_ioctl
#endif
};

struct miscdevice zfcp_cfdc_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "zfcp_cfdc",
	.fops = &zfcp_cfdc_fops,
};
Commit	Line	Data
45633fdc CS	1	/*
	2	* zfcp device driver
	3	*
	4	* Userspace interface for accessing the
	5	* Access Control Lists / Control File Data Channel
	6	*
3869bb6e	7	* Copyright IBM Corporation 2008, 2009
45633fdc CS	8	*/
45633fdc CS	9
ecf39d42 CS	10	#define KMSG_COMPONENT "zfcp"
	11	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	12
45633fdc CS	13	#include <linux/types.h>
45633fdc CS	14	#include <linux/miscdevice.h>
9e2ab1fa	15	#include <asm/compat.h>
45633fdc CS	16	#include <asm/ccwdev.h>
	17	#include "zfcp_def.h"
	18	#include "zfcp_ext.h"
	19	#include "zfcp_fsf.h"
	20
	21	#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
	22	#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
	23	#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
	24	#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
	25	#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
	26
	27	#define ZFCP_CFDC_DOWNLOAD 0x00000001
	28	#define ZFCP_CFDC_UPLOAD 0x00000002
	29	#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
	30
	31	#define ZFCP_CFDC_IOC_MAGIC 0xDD
	32	#define ZFCP_CFDC_IOC \
	33	_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
	34
	35	/**
	36	* struct zfcp_cfdc_data - data for ioctl cfdc interface
	37	* @signature: request signature
	38	* @devno: FCP adapter device number
	39	* @command: command code
	40	* @fsf_status: returns status of FSF command to userspace
	41	* @fsf_status_qual: returned to userspace
	42	* @payloads: access conflicts list
	43	* @control_file: access control table
	44	*/
	45	struct zfcp_cfdc_data {
	46	u32 signature;
	47	u32 devno;
	48	u32 command;
	49	u32 fsf_status;
	50	u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	51	u8 payloads[256];
	52	u8 control_file[0];
	53	};
	54
	55	static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
	56	void __user *user_buffer)
	57	{
	58	unsigned int length;
	59	unsigned int size = ZFCP_CFDC_MAX_SIZE;
	60
	61	while (size) {
	62	length = min((unsigned int)size, sg->length);
	63	if (copy_from_user(sg_virt(sg++), user_buffer, length))
	64	return -EFAULT;
	65	user_buffer += length;
	66	size -= length;
	67	}
	68	return 0;
	69	}
	70
	71	static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
	72	struct scatterlist *sg)
	73	{
	74	unsigned int length;
	75	unsigned int size = ZFCP_CFDC_MAX_SIZE;
	76
	77	while (size) {
	78	length = min((unsigned int) size, sg->length);
	79	if (copy_to_user(user_buffer, sg_virt(sg++), length))
80	return -EFAULT;
81	user_buffer += length;
82	size -= length;
83	}
84	return 0;
85	}
86
87	static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
88	{
b228af02	89	char busid[9];
de3dc572 SS	90	struct ccw_device *cdev;
de3dc572 SS	91	struct zfcp_adapter *adapter;
c5afd81e	92
b228af02	93	snprintf(busid, sizeof(busid), "0.0.%04x", devno);
de3dc572 SS	94	cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	95	if (!cdev)
	96	return NULL;
	97
	98	adapter = zfcp_ccw_adapter_by_cdev(cdev);
	99
	100	put_device(&cdev->dev);
c5afd81e	101	return adapter;
45633fdc CS	102	}
	103
	104	static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
	105	{
	106	switch (command) {
	107	case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
	108	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	109	fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
	110	break;
	111	case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
	112	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	113	fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
	114	break;
	115	case ZFCP_CFDC_CMND_FULL_ACCESS:
	116	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	117	fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
	118	break;
	119	case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
	120	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	121	fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
	122	break;
	123	case ZFCP_CFDC_CMND_UPLOAD:
	124	fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
	125	fsf_cfdc->option = 0;
	126	break;
	127	default:
	128	return -EINVAL;
	129	}
	130
	131	return 0;
	132	}
	133
	134	static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
	135	u8 __user *control_file)
	136	{
	137	int retval;
	138	retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
	139	if (retval)
	140	return retval;
	141
	142	sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
	143
	144	if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
	145	command & ZFCP_CFDC_DOWNLOAD) {
	146	retval = zfcp_cfdc_copy_from_user(sg, control_file);
	147	if (retval) {
	148	zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
	149	return -EFAULT;
	150	}
	151	}
	152
	153	return 0;
	154	}
	155
	156	static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
	157	struct zfcp_fsf_req *req)
	158	{
	159	data->fsf_status = req->qtcb->header.fsf_status;
	160	memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
	161	sizeof(union fsf_status_qual));
	162	memcpy(&data->payloads, &req->qtcb->bottom.support.els,
	163	sizeof(req->qtcb->bottom.support.els));
	164	}
	165
166	static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
9e2ab1fa	167	unsigned long arg)
45633fdc CS	168	{
	169	struct zfcp_cfdc_data *data;
	170	struct zfcp_cfdc_data __user *data_user;
	171	struct zfcp_adapter *adapter;
	172	struct zfcp_fsf_req *req;
	173	struct zfcp_fsf_cfdc *fsf_cfdc;
	174	int retval;
	175
	176	if (command != ZFCP_CFDC_IOC)
	177	return -ENOTTY;
	178
9e2ab1fa HC	179	if (is_compat_task())
	180	data_user = compat_ptr(arg);
	181	else
	182	data_user = (void __user *)arg;
	183
45633fdc CS	184	if (!data_user)
	185	return -EINVAL;
	186
	187	fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
	188	if (!fsf_cfdc)
	189	return -ENOMEM;
	190
	191	data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
	192	if (!data) {
	193	retval = -ENOMEM;
	194	goto no_mem_sense;
	195	}
	196
	197	retval = copy_from_user(data, data_user, sizeof(*data));
	198	if (retval) {
	199	retval = -EFAULT;
	200	goto free_buffer;
	201	}
	202
	203	if (data->signature != 0xCFDCACDF) {
	204	retval = -EINVAL;
	205	goto free_buffer;
	206	}
	207
	208	retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
	209
	210	adapter = zfcp_cfdc_get_adapter(data->devno);
	211	if (!adapter) {
	212	retval = -ENXIO;
	213	goto free_buffer;
	214	}
	215
	216	retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
	217	data_user->control_file);
	218	if (retval)
	219	goto adapter_put;
	220	req = zfcp_fsf_control_file(adapter, fsf_cfdc);
	221	if (IS_ERR(req)) {
	222	retval = PTR_ERR(req);
	223	goto free_sg;
	224	}
	225
	226	if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
	227	retval = -ENXIO;
	228	goto free_fsf;
	229	}
	230
	231	zfcp_cfdc_req_to_sense(data, req);
	232	retval = copy_to_user(data_user, data, sizeof(*data_user));
	233	if (retval) {
	234	retval = -EFAULT;
	235	goto free_fsf;
	236	}
	237
	238	if (data->command & ZFCP_CFDC_UPLOAD)
	239	retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
	240	fsf_cfdc->sg);
	241
	242	free_fsf:
	243	zfcp_fsf_req_free(req);
	244	free_sg:
	245	zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
	246	adapter_put:
de3dc572	247	zfcp_ccw_adapter_put(adapter);
45633fdc CS	248	free_buffer:
	249	kfree(data);
	250	no_mem_sense:
	251	kfree(fsf_cfdc);
	252	return retval;
	253	}
	254
	255	static const struct file_operations zfcp_cfdc_fops = {
	256	.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
	257	#ifdef CONFIG_COMPAT
	258	.compat_ioctl = zfcp_cfdc_dev_ioctl
	259	#endif
	260	};
	261
	262	struct miscdevice zfcp_cfdc_misc = {
	263	.minor = MISC_DYNAMIC_MINOR,
	264	.name = "zfcp_cfdc",
	265	.fops = &zfcp_cfdc_fops,
	266	};