[mirror_ubuntu-artful-kernel.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/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 *ccwdev;
	struct zfcp_adapter *adapter = NULL;

	snprintf(busid, sizeof(busid), "0.0.%04x", devno);
	ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	if (!ccwdev)
		goto out;

	adapter = dev_get_drvdata(&ccwdev->dev);
	if (!adapter)
		goto out_put;

	zfcp_adapter_get(adapter);
out_put:
	put_device(&ccwdev->dev);
out:
	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 buffer)
{
	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;

	data_user = (void __user *) buffer;
	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;
	}
	zfcp_adapter_get(adapter);

	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_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>
	14	#include <linux/miscdevice.h>
	15	#include <asm/ccwdev.h>
	16	#include "zfcp_def.h"
	17	#include "zfcp_ext.h"
	18	#include "zfcp_fsf.h"
	19
	20	#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
	21	#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
	22	#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
	23	#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
	24	#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
	25
	26	#define ZFCP_CFDC_DOWNLOAD 0x00000001
	27	#define ZFCP_CFDC_UPLOAD 0x00000002
	28	#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
	29
	30	#define ZFCP_CFDC_IOC_MAGIC 0xDD
	31	#define ZFCP_CFDC_IOC \
	32	_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
	33
	34	/**
	35	* struct zfcp_cfdc_data - data for ioctl cfdc interface
	36	* @signature: request signature
	37	* @devno: FCP adapter device number
	38	* @command: command code
	39	* @fsf_status: returns status of FSF command to userspace
	40	* @fsf_status_qual: returned to userspace
	41	* @payloads: access conflicts list
	42	* @control_file: access control table
	43	*/
	44	struct zfcp_cfdc_data {
	45	u32 signature;
	46	u32 devno;
	47	u32 command;
	48	u32 fsf_status;
	49	u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	50	u8 payloads[256];
	51	u8 control_file[0];
	52	};
	53
	54	static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
	55	void __user *user_buffer)
	56	{
	57	unsigned int length;
	58	unsigned int size = ZFCP_CFDC_MAX_SIZE;
	59
	60	while (size) {
	61	length = min((unsigned int)size, sg->length);
	62	if (copy_from_user(sg_virt(sg++), user_buffer, length))
	63	return -EFAULT;
	64	user_buffer += length;
	65	size -= length;
	66	}
	67	return 0;
	68	}
	69
	70	static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
	71	struct scatterlist *sg)
	72	{
	73	unsigned int length;
	74	unsigned int size = ZFCP_CFDC_MAX_SIZE;
	75
	76	while (size) {
77	length = min((unsigned int) size, sg->length);
78	if (copy_to_user(user_buffer, sg_virt(sg++), length))
79	return -EFAULT;
80	user_buffer += length;
81	size -= length;
82	}
83	return 0;
84	}
85
86	static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
87	{
b228af02	88	char busid[9];
c5afd81e CS	89	struct ccw_device *ccwdev;
	90	struct zfcp_adapter *adapter = NULL;
	91
b228af02	92	snprintf(busid, sizeof(busid), "0.0.%04x", devno);
c5afd81e CS	93	ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	94	if (!ccwdev)
	95	goto out;
	96
	97	adapter = dev_get_drvdata(&ccwdev->dev);
	98	if (!adapter)
	99	goto out_put;
	100
	101	zfcp_adapter_get(adapter);
	102	out_put:
	103	put_device(&ccwdev->dev);
	104	out:
	105	return adapter;
45633fdc CS	106	}
	107
	108	static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
	109	{
	110	switch (command) {
	111	case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
	112	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	113	fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
	114	break;
	115	case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
	116	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	117	fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
	118	break;
	119	case ZFCP_CFDC_CMND_FULL_ACCESS:
	120	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	121	fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
	122	break;
	123	case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
	124	fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
	125	fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
	126	break;
	127	case ZFCP_CFDC_CMND_UPLOAD:
	128	fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
	129	fsf_cfdc->option = 0;
	130	break;
	131	default:
	132	return -EINVAL;
	133	}
	134
	135	return 0;
	136	}
	137
	138	static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
	139	u8 __user *control_file)
	140	{
	141	int retval;
	142	retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
	143	if (retval)
	144	return retval;
	145
	146	sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
	147
	148	if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
	149	command & ZFCP_CFDC_DOWNLOAD) {
	150	retval = zfcp_cfdc_copy_from_user(sg, control_file);
	151	if (retval) {
	152	zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
	153	return -EFAULT;
	154	}
	155	}
	156
	157	return 0;
	158	}
	159
	160	static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
	161	struct zfcp_fsf_req *req)
	162	{
	163	data->fsf_status = req->qtcb->header.fsf_status;
	164	memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
	165	sizeof(union fsf_status_qual));
	166	memcpy(&data->payloads, &req->qtcb->bottom.support.els,
	167	sizeof(req->qtcb->bottom.support.els));
	168	}
	169
170	static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
171	unsigned long buffer)
172	{
173	struct zfcp_cfdc_data *data;
174	struct zfcp_cfdc_data __user *data_user;
175	struct zfcp_adapter *adapter;
176	struct zfcp_fsf_req *req;
177	struct zfcp_fsf_cfdc *fsf_cfdc;
178	int retval;
179
180	if (command != ZFCP_CFDC_IOC)
181	return -ENOTTY;
182
183	data_user = (void __user *) buffer;
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	}
3869bb6e	215	zfcp_adapter_get(adapter);
45633fdc CS	216
	217	retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
	218	data_user->control_file);
	219	if (retval)
	220	goto adapter_put;
	221	req = zfcp_fsf_control_file(adapter, fsf_cfdc);
	222	if (IS_ERR(req)) {
	223	retval = PTR_ERR(req);
	224	goto free_sg;
	225	}
	226
	227	if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
	228	retval = -ENXIO;
	229	goto free_fsf;
	230	}
	231
	232	zfcp_cfdc_req_to_sense(data, req);
	233	retval = copy_to_user(data_user, data, sizeof(*data_user));
	234	if (retval) {
	235	retval = -EFAULT;
	236	goto free_fsf;
	237	}
	238
	239	if (data->command & ZFCP_CFDC_UPLOAD)
	240	retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
	241	fsf_cfdc->sg);
	242
	243	free_fsf:
	244	zfcp_fsf_req_free(req);
	245	free_sg:
	246	zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
	247	adapter_put:
	248	zfcp_adapter_put(adapter);
	249	free_buffer:
	250	kfree(data);
	251	no_mem_sense:
	252	kfree(fsf_cfdc);
	253	return retval;
	254	}
	255
	256	static const struct file_operations zfcp_cfdc_fops = {
	257	.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
	258	#ifdef CONFIG_COMPAT
	259	.compat_ioctl = zfcp_cfdc_dev_ioctl
	260	#endif
	261	};
	262
	263	struct miscdevice zfcp_cfdc_misc = {
	264	.minor = MISC_DYNAMIC_MINOR,
	265	.name = "zfcp_cfdc",
	266	.fops = &zfcp_cfdc_fops,
	267	};