summaryrefslogtreecommitdiffstats
path: root/drivers/s390/scsi/zfcp_cfdc.c
blob: 4c09d03bcb32578737fbfa9481c057e4bb91c3f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
/*
 * zfcp device driver
 *
 * Userspace interface for accessing the
 * Access Control Lists / Control File Data Channel;
 * handling of response code and states for ports and LUNs.
 *
 * Copyright IBM Corporation 2008, 2010
 */

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

#include <linux/slab.h>
#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 = memdup_user(data_user, sizeof(*data_user));
	if (IS_ERR(data)) {
		retval = PTR_ERR(data);
		goto no_mem_sense;
	}

	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 = {
	.open = nonseekable_open,
	.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = zfcp_cfdc_dev_ioctl,
#endif
	.llseek = no_llseek,
};

struct miscdevice zfcp_cfdc_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "zfcp_cfdc",
	.fops = &zfcp_cfdc_fops,
};

/**
 * zfcp_cfdc_adapter_access_changed - Process change in adapter ACT
 * @adapter: Adapter where the Access Control Table (ACT) changed
 *
 * After a change in the adapter ACT, check if access to any
 * previously denied resources is now possible.
 */
void zfcp_cfdc_adapter_access_changed(struct zfcp_adapter *adapter)
{
	unsigned long flags;
	struct zfcp_port *port;
	struct scsi_device *sdev;
	struct zfcp_scsi_dev *zfcp_sdev;
	int status;

	if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
		return;

	read_lock_irqsave(&adapter->port_list_lock, flags);
	list_for_each_entry(port, &adapter->port_list, list) {
		status = atomic_read(&port->status);
		if ((status & ZFCP_STATUS_COMMON_ACCESS_DENIED) ||
		    (status & ZFCP_STATUS_COMMON_ACCESS_BOXED))
			zfcp_erp_port_reopen(port,
					     ZFCP_STATUS_COMMON_ERP_FAILED,
					     "cfaac_1", NULL);
	}
	read_unlock_irqrestore(&adapter->port_list_lock, flags);

	shost_for_each_device(sdev, port->adapter->scsi_host) {
		zfcp_sdev = sdev_to_zfcp(sdev);
		status = atomic_read(&zfcp_sdev->status);
		if ((status & ZFCP_STATUS_COMMON_ACCESS_DENIED) ||
		    (status & ZFCP_STATUS_COMMON_ACCESS_BOXED))
			zfcp_erp_lun_reopen(sdev,
					    ZFCP_STATUS_COMMON_ERP_FAILED,
					    "cfaac_2", NULL);
	}
}

static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
{
	u16 subtable = table >> 16;
	u16 rule = table & 0xffff;
	const char *act_type[] = { "unknown", "OS", "WWPN", "DID", "LUN" };

	if (subtable && subtable < ARRAY_SIZE(act_type))
		dev_warn(&adapter->ccw_device->dev,
			 "Access denied according to ACT rule type %s, "
			 "rule %d\n", act_type[subtable], rule);
}

/**
 * zfcp_cfdc_port_denied - Process "access denied" for port
 * @port: The port where the access has been denied
 * @qual: The FSF status qualifier for the access denied FSF status
 */
void zfcp_cfdc_port_denied(struct zfcp_port *port,
			   union fsf_status_qual *qual)
{
	dev_warn(&port->adapter->ccw_device->dev,
		 "Access denied to port 0x%016Lx\n",
		 (unsigned long long)port->wwpn);

	zfcp_act_eval_err(port->adapter, qual->halfword[0]);
	zfcp_act_eval_err(port->adapter, qual->halfword[1]);
	zfcp_erp_set_port_status(port,
				 ZFCP_STATUS_COMMON_ERP_FAILED |
				 ZFCP_STATUS_COMMON_ACCESS_DENIED);
}

/**
 * zfcp_cfdc_lun_denied - Process "access denied" for LUN
 * @sdev: The SCSI device / LUN where the access has been denied
 * @qual: The FSF status qualifier for the access denied FSF status
 */
void zfcp_cfdc_lun_denied(struct scsi_device *sdev,
			  union fsf_status_qual *qual)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);

	dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
		 "Access denied to LUN 0x%016Lx on port 0x%016Lx\n",
		 zfcp_scsi_dev_lun(sdev),
		 (unsigned long long)zfcp_sdev->port->wwpn);
	zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->halfword[0]);
	zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->halfword[1]);
	zfcp_erp_set_lun_status(sdev,
				ZFCP_STATUS_COMMON_ERP_FAILED |
				ZFCP_STATUS_COMMON_ACCESS_DENIED);

	atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
	atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
}

/**
 * zfcp_cfdc_lun_shrng_vltn - Evaluate LUN sharing violation status
 * @sdev: The LUN / SCSI device where sharing violation occurred
 * @qual: The FSF status qualifier from the LUN sharing violation
 */
void zfcp_cfdc_lun_shrng_vltn(struct scsi_device *sdev,
			      union fsf_status_qual *qual)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);

	if (qual->word[0])
		dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
			 "LUN 0x%Lx on port 0x%Lx is already in "
			 "use by CSS%d, MIF Image ID %x\n",
			 zfcp_scsi_dev_lun(sdev),
			 (unsigned long long)zfcp_sdev->port->wwpn,
			 qual->fsf_queue_designator.cssid,
			 qual->fsf_queue_designator.hla);
	else
		zfcp_act_eval_err(zfcp_sdev->port->adapter, qual->word[2]);

	zfcp_erp_set_lun_status(sdev,
				ZFCP_STATUS_COMMON_ERP_FAILED |
				ZFCP_STATUS_COMMON_ACCESS_DENIED);
	atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
	atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
}

/**
 * zfcp_cfdc_open_lun_eval - Eval access ctrl. status for successful "open lun"
 * @sdev: The SCSI device / LUN where to evaluate the status
 * @bottom: The qtcb bottom with the status from the "open lun"
 *
 * Returns: 0 if LUN is usable, -EACCES if the access control table
 *          reports an unsupported configuration.
 */
int zfcp_cfdc_open_lun_eval(struct scsi_device *sdev,
			    struct fsf_qtcb_bottom_support *bottom)
{
	int shared, rw;
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;

	if ((adapter->connection_features & FSF_FEATURE_NPIV_MODE) ||
	    !(adapter->adapter_features & FSF_FEATURE_LUN_SHARING) ||
	    zfcp_ccw_priv_sch(adapter))
		return 0;

	shared = !(bottom->lun_access_info & FSF_UNIT_ACCESS_EXCLUSIVE);
	rw = (bottom->lun_access_info & FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);

	if (shared)
		atomic_set_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);

	if (!rw) {
		atomic_set_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
		dev_info(&adapter->ccw_device->dev, "SCSI device at LUN "
			 "0x%016Lx on port 0x%016Lx opened read-only\n",
			 zfcp_scsi_dev_lun(sdev),
			 (unsigned long long)zfcp_sdev->port->wwpn);
	}

	if (!shared && !rw) {
		dev_err(&adapter->ccw_device->dev, "Exclusive read-only access "
			"not supported (LUN 0x%016Lx, port 0x%016Lx)\n",
			zfcp_scsi_dev_lun(sdev),
			(unsigned long long)zfcp_sdev->port->wwpn);
		zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
		zfcp_erp_lun_shutdown(sdev, 0, "fsouh_6", NULL);
		return -EACCES;
	}

	if (shared && rw) {
		dev_err(&adapter->ccw_device->dev,
			"Shared read-write access not supported "
			"(LUN 0x%016Lx, port 0x%016Lx)\n",
			zfcp_scsi_dev_lun(sdev),
			(unsigned long long)zfcp_sdev->port->wwpn);
		zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
		zfcp_erp_lun_shutdown(sdev, 0, "fsosh_8", NULL);
		return -EACCES;
	}

	return 0;
}