xref: /openbmc/linux/drivers/s390/cio/device_id.c (revision 5c2e5a0c)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  CCW device SENSE ID I/O handling.
4  *
5  *    Copyright IBM Corp. 2002, 2009
6  *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
7  *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
8  *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <asm/ccwdev.h>
16 #include <asm/setup.h>
17 #include <asm/cio.h>
18 #include <asm/diag.h>
19 
20 #include "cio.h"
21 #include "cio_debug.h"
22 #include "device.h"
23 #include "io_sch.h"
24 
25 #define SENSE_ID_RETRIES	256
26 #define SENSE_ID_TIMEOUT	(10 * HZ)
27 #define SENSE_ID_MIN_LEN	4
28 #define SENSE_ID_BASIC_LEN	7
29 
30 /**
31  * diag210_to_senseid - convert diag 0x210 data to sense id information
32  * @senseid: sense id
33  * @diag: diag 0x210 data
34  *
35  * Return 0 on success, non-zero otherwise.
36  */
diag210_to_senseid(struct senseid * senseid,struct diag210 * diag)37 static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
38 {
39 	static struct {
40 		int class, type, cu_type;
41 	} vm_devices[] = {
42 		{ 0x08, 0x01, 0x3480 },
43 		{ 0x08, 0x02, 0x3430 },
44 		{ 0x08, 0x10, 0x3420 },
45 		{ 0x08, 0x42, 0x3424 },
46 		{ 0x08, 0x44, 0x9348 },
47 		{ 0x08, 0x81, 0x3490 },
48 		{ 0x08, 0x82, 0x3422 },
49 		{ 0x10, 0x41, 0x1403 },
50 		{ 0x10, 0x42, 0x3211 },
51 		{ 0x10, 0x43, 0x3203 },
52 		{ 0x10, 0x45, 0x3800 },
53 		{ 0x10, 0x47, 0x3262 },
54 		{ 0x10, 0x48, 0x3820 },
55 		{ 0x10, 0x49, 0x3800 },
56 		{ 0x10, 0x4a, 0x4245 },
57 		{ 0x10, 0x4b, 0x4248 },
58 		{ 0x10, 0x4d, 0x3800 },
59 		{ 0x10, 0x4e, 0x3820 },
60 		{ 0x10, 0x4f, 0x3820 },
61 		{ 0x10, 0x82, 0x2540 },
62 		{ 0x10, 0x84, 0x3525 },
63 		{ 0x20, 0x81, 0x2501 },
64 		{ 0x20, 0x82, 0x2540 },
65 		{ 0x20, 0x84, 0x3505 },
66 		{ 0x40, 0x01, 0x3278 },
67 		{ 0x40, 0x04, 0x3277 },
68 		{ 0x40, 0x80, 0x2250 },
69 		{ 0x40, 0xc0, 0x5080 },
70 		{ 0x80, 0x00, 0x3215 },
71 	};
72 	int i;
73 
74 	/* Special case for osa devices. */
75 	if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
76 		senseid->cu_type = 0x3088;
77 		senseid->cu_model = 0x60;
78 		senseid->reserved = 0xff;
79 		return 0;
80 	}
81 	for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
82 		if (diag->vrdcvcla == vm_devices[i].class &&
83 		    diag->vrdcvtyp == vm_devices[i].type) {
84 			senseid->cu_type = vm_devices[i].cu_type;
85 			senseid->reserved = 0xff;
86 			return 0;
87 		}
88 	}
89 
90 	return -ENODEV;
91 }
92 
93 /**
94  * diag210_get_dev_info - retrieve device information via diag 0x210
95  * @cdev: ccw device
96  *
97  * Returns zero on success, non-zero otherwise.
98  */
diag210_get_dev_info(struct ccw_device * cdev)99 static int diag210_get_dev_info(struct ccw_device *cdev)
100 {
101 	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
102 	struct senseid *senseid = &cdev->private->dma_area->senseid;
103 	struct diag210 diag_data;
104 	int rc;
105 
106 	if (dev_id->ssid != 0)
107 		return -ENODEV;
108 	memset(&diag_data, 0, sizeof(diag_data));
109 	diag_data.vrdcdvno	= dev_id->devno;
110 	diag_data.vrdclen	= sizeof(diag_data);
111 	rc = diag210(&diag_data);
112 	CIO_TRACE_EVENT(4, "diag210");
113 	CIO_HEX_EVENT(4, &rc, sizeof(rc));
114 	CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
115 	if (rc != 0 && rc != 2)
116 		goto err_failed;
117 	if (diag210_to_senseid(senseid, &diag_data))
118 		goto err_unknown;
119 	return 0;
120 
121 err_unknown:
122 	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
123 		      dev_id->ssid, dev_id->devno);
124 	return -ENODEV;
125 err_failed:
126 	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
127 		      dev_id->ssid, dev_id->devno, rc);
128 	return -ENODEV;
129 }
130 
131 /*
132  * Initialize SENSE ID data.
133  */
snsid_init(struct ccw_device * cdev)134 static void snsid_init(struct ccw_device *cdev)
135 {
136 	cdev->private->flags.esid = 0;
137 
138 	memset(&cdev->private->dma_area->senseid, 0,
139 	       sizeof(cdev->private->dma_area->senseid));
140 	cdev->private->dma_area->senseid.cu_type = 0xffff;
141 }
142 
143 /*
144  * Check for complete SENSE ID data.
145  */
snsid_check(struct ccw_device * cdev,void * data)146 static int snsid_check(struct ccw_device *cdev, void *data)
147 {
148 	struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
149 	int len = sizeof(struct senseid) - scsw->count;
150 
151 	/* Check for incomplete SENSE ID data. */
152 	if (len < SENSE_ID_MIN_LEN)
153 		goto out_restart;
154 	if (cdev->private->dma_area->senseid.cu_type == 0xffff)
155 		goto out_restart;
156 	/* Check for incompatible SENSE ID data. */
157 	if (cdev->private->dma_area->senseid.reserved != 0xff)
158 		return -EOPNOTSUPP;
159 	/* Check for extended-identification information. */
160 	if (len > SENSE_ID_BASIC_LEN)
161 		cdev->private->flags.esid = 1;
162 	return 0;
163 
164 out_restart:
165 	snsid_init(cdev);
166 	return -EAGAIN;
167 }
168 
169 /*
170  * Process SENSE ID request result.
171  */
snsid_callback(struct ccw_device * cdev,void * data,int rc)172 static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
173 {
174 	struct ccw_dev_id *id = &cdev->private->dev_id;
175 	struct senseid *senseid = &cdev->private->dma_area->senseid;
176 	int vm = 0;
177 
178 	if (rc && MACHINE_IS_VM) {
179 		/* Try diag 0x210 fallback on z/VM. */
180 		snsid_init(cdev);
181 		if (diag210_get_dev_info(cdev) == 0) {
182 			rc = 0;
183 			vm = 1;
184 		}
185 	}
186 	CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
187 		      "%04x/%02x%s\n", id->ssid, id->devno, rc,
188 		      senseid->cu_type, senseid->cu_model, senseid->dev_type,
189 		      senseid->dev_model, vm ? " (diag210)" : "");
190 	ccw_device_sense_id_done(cdev, rc);
191 }
192 
193 /**
194  * ccw_device_sense_id_start - perform SENSE ID
195  * @cdev: ccw device
196  *
197  * Execute a SENSE ID channel program on @cdev to update its sense id
198  * information. When finished, call ccw_device_sense_id_done with a
199  * return code specifying the result.
200  */
ccw_device_sense_id_start(struct ccw_device * cdev)201 void ccw_device_sense_id_start(struct ccw_device *cdev)
202 {
203 	struct subchannel *sch = to_subchannel(cdev->dev.parent);
204 	struct ccw_request *req = &cdev->private->req;
205 	struct ccw1 *cp = cdev->private->dma_area->iccws;
206 
207 	CIO_TRACE_EVENT(4, "snsid");
208 	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
209 	/* Data setup. */
210 	snsid_init(cdev);
211 	/* Channel program setup. */
212 	cp->cmd_code	= CCW_CMD_SENSE_ID;
213 	cp->cda		= (u32)virt_to_phys(&cdev->private->dma_area->senseid);
214 	cp->count	= sizeof(struct senseid);
215 	cp->flags	= CCW_FLAG_SLI;
216 	/* Request setup. */
217 	memset(req, 0, sizeof(*req));
218 	req->cp		= cp;
219 	req->timeout	= SENSE_ID_TIMEOUT;
220 	req->maxretries	= SENSE_ID_RETRIES;
221 	req->lpm	= sch->schib.pmcw.pam & sch->opm;
222 	req->check	= snsid_check;
223 	req->callback	= snsid_callback;
224 	ccw_request_start(cdev);
225 }
226