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