summaryrefslogtreecommitdiff
path: root/drivers/s390/cio/device_id.c
blob: d4fa30541a33bc48f4c318f113ca4e9a5b3d56d3 (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
/*
 *  CCW device SENSE ID I/O handling.
 *
 *    Copyright IBM Corp. 2002, 2009
 *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
 *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/ccwdev.h>
#include <asm/setup.h>
#include <asm/cio.h>
#include <asm/diag.h>

#include "cio.h"
#include "cio_debug.h"
#include "device.h"
#include "io_sch.h"

#define SENSE_ID_RETRIES	256
#define SENSE_ID_TIMEOUT	(10 * HZ)
#define SENSE_ID_MIN_LEN	4
#define SENSE_ID_BASIC_LEN	7

/**
 * diag210_to_senseid - convert diag 0x210 data to sense id information
 * @senseid: sense id
 * @diag: diag 0x210 data
 *
 * Return 0 on success, non-zero otherwise.
 */
static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
{
	static struct {
		int class, type, cu_type;
	} vm_devices[] = {
		{ 0x08, 0x01, 0x3480 },
		{ 0x08, 0x02, 0x3430 },
		{ 0x08, 0x10, 0x3420 },
		{ 0x08, 0x42, 0x3424 },
		{ 0x08, 0x44, 0x9348 },
		{ 0x08, 0x81, 0x3490 },
		{ 0x08, 0x82, 0x3422 },
		{ 0x10, 0x41, 0x1403 },
		{ 0x10, 0x42, 0x3211 },
		{ 0x10, 0x43, 0x3203 },
		{ 0x10, 0x45, 0x3800 },
		{ 0x10, 0x47, 0x3262 },
		{ 0x10, 0x48, 0x3820 },
		{ 0x10, 0x49, 0x3800 },
		{ 0x10, 0x4a, 0x4245 },
		{ 0x10, 0x4b, 0x4248 },
		{ 0x10, 0x4d, 0x3800 },
		{ 0x10, 0x4e, 0x3820 },
		{ 0x10, 0x4f, 0x3820 },
		{ 0x10, 0x82, 0x2540 },
		{ 0x10, 0x84, 0x3525 },
		{ 0x20, 0x81, 0x2501 },
		{ 0x20, 0x82, 0x2540 },
		{ 0x20, 0x84, 0x3505 },
		{ 0x40, 0x01, 0x3278 },
		{ 0x40, 0x04, 0x3277 },
		{ 0x40, 0x80, 0x2250 },
		{ 0x40, 0xc0, 0x5080 },
		{ 0x80, 0x00, 0x3215 },
	};
	int i;

	/* Special case for osa devices. */
	if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
		senseid->cu_type = 0x3088;
		senseid->cu_model = 0x60;
		senseid->reserved = 0xff;
		return 0;
	}
	for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
		if (diag->vrdcvcla == vm_devices[i].class &&
		    diag->vrdcvtyp == vm_devices[i].type) {
			senseid->cu_type = vm_devices[i].cu_type;
			senseid->reserved = 0xff;
			return 0;
		}
	}

	return -ENODEV;
}

/**
 * diag_get_dev_info - retrieve device information via diag 0x210
 * @cdev: ccw device
 *
 * Returns zero on success, non-zero otherwise.
 */
static int diag210_get_dev_info(struct ccw_device *cdev)
{
	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
	struct senseid *senseid = &cdev->private->senseid;
	struct diag210 diag_data;
	int rc;

	if (dev_id->ssid != 0)
		return -ENODEV;
	memset(&diag_data, 0, sizeof(diag_data));
	diag_data.vrdcdvno	= dev_id->devno;
	diag_data.vrdclen	= sizeof(diag_data);
	rc = diag210(&diag_data);
	CIO_TRACE_EVENT(4, "diag210");
	CIO_HEX_EVENT(4, &rc, sizeof(rc));
	CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
	if (rc != 0 && rc != 2)
		goto err_failed;
	if (diag210_to_senseid(senseid, &diag_data))
		goto err_unknown;
	return 0;

err_unknown:
	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
		      dev_id->ssid, dev_id->devno);
	return -ENODEV;
err_failed:
	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
		      dev_id->ssid, dev_id->devno, rc);
	return -ENODEV;
}

/*
 * Initialize SENSE ID data.
 */
static void snsid_init(struct ccw_device *cdev)
{
	cdev->private->flags.esid = 0;
	memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
	cdev->private->senseid.cu_type = 0xffff;
}

/*
 * Check for complete SENSE ID data.
 */
static int snsid_check(struct ccw_device *cdev, void *data)
{
	struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
	int len = sizeof(struct senseid) - scsw->count;

	/* Check for incomplete SENSE ID data. */
	if (len < SENSE_ID_MIN_LEN)
		goto out_restart;
	if (cdev->private->senseid.cu_type == 0xffff)
		goto out_restart;
	/* Check for incompatible SENSE ID data. */
	if (cdev->private->senseid.reserved != 0xff)
		return -EOPNOTSUPP;
	/* Check for extended-identification information. */
	if (len > SENSE_ID_BASIC_LEN)
		cdev->private->flags.esid = 1;
	return 0;

out_restart:
	snsid_init(cdev);
	return -EAGAIN;
}

/*
 * Process SENSE ID request result.
 */
static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
{
	struct ccw_dev_id *id = &cdev->private->dev_id;
	struct senseid *senseid = &cdev->private->senseid;
	int vm = 0;

	if (rc && MACHINE_IS_VM) {
		/* Try diag 0x210 fallback on z/VM. */
		snsid_init(cdev);
		if (diag210_get_dev_info(cdev) == 0) {
			rc = 0;
			vm = 1;
		}
	}
	CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
		      "%04x/%02x%s\n", id->ssid, id->devno, rc,
		      senseid->cu_type, senseid->cu_model, senseid->dev_type,
		      senseid->dev_model, vm ? " (diag210)" : "");
	ccw_device_sense_id_done(cdev, rc);
}

/**
 * ccw_device_sense_id_start - perform SENSE ID
 * @cdev: ccw device
 *
 * Execute a SENSE ID channel program on @cdev to update its sense id
 * information. When finished, call ccw_device_sense_id_done with a
 * return code specifying the result.
 */
void ccw_device_sense_id_start(struct ccw_device *cdev)
{
	struct subchannel *sch = to_subchannel(cdev->dev.parent);
	struct ccw_request *req = &cdev->private->req;
	struct ccw1 *cp = cdev->private->iccws;

	CIO_TRACE_EVENT(4, "snsid");
	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
	/* Data setup. */
	snsid_init(cdev);
	/* Channel program setup. */
	cp->cmd_code	= CCW_CMD_SENSE_ID;
	cp->cda		= (u32) (addr_t) &cdev->private->senseid;
	cp->count	= sizeof(struct senseid);
	cp->flags	= CCW_FLAG_SLI;
	/* Request setup. */
	memset(req, 0, sizeof(*req));
	req->cp		= cp;
	req->timeout	= SENSE_ID_TIMEOUT;
	req->maxretries	= SENSE_ID_RETRIES;
	req->lpm	= sch->schib.pmcw.pam & sch->opm;
	req->check	= snsid_check;
	req->callback	= snsid_callback;
	ccw_request_start(cdev);
}