1 /*
2 * IDE ioctls handling.
3 */
4
5 #include <linux/export.h>
6 #include <linux/hdreg.h>
7 #include <linux/ide.h>
8 #include <linux/slab.h>
9
10 static const struct ide_ioctl_devset ide_ioctl_settings[] = {
11 { HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit },
12 { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
13 { HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq },
14 { HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma },
15 { -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode },
16 { 0 }
17 };
18
ide_setting_ioctl(ide_drive_t * drive,struct block_device * bdev,unsigned int cmd,unsigned long arg,const struct ide_ioctl_devset * s)19 int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
20 unsigned int cmd, unsigned long arg,
21 const struct ide_ioctl_devset *s)
22 {
23 const struct ide_devset *ds;
24 int err = -EOPNOTSUPP;
25
26 for (; (ds = s->setting); s++) {
27 if (ds->get && s->get_ioctl == cmd)
28 goto read_val;
29 else if (ds->set && s->set_ioctl == cmd)
30 goto set_val;
31 }
32
33 return err;
34
35 read_val:
36 mutex_lock(&ide_setting_mtx);
37 err = ds->get(drive);
38 mutex_unlock(&ide_setting_mtx);
39 return err >= 0 ? put_user(err, (long __user *)arg) : err;
40
41 set_val:
42 if (bdev != bdev->bd_contains)
43 err = -EINVAL;
44 else {
45 if (!capable(CAP_SYS_ADMIN))
46 err = -EACCES;
47 else {
48 mutex_lock(&ide_setting_mtx);
49 err = ide_devset_execute(drive, ds, arg);
50 mutex_unlock(&ide_setting_mtx);
51 }
52 }
53 return err;
54 }
55 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
56
ide_get_identity_ioctl(ide_drive_t * drive,unsigned int cmd,unsigned long arg)57 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
58 unsigned long arg)
59 {
60 u16 *id = NULL;
61 int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
62 int rc = 0;
63
64 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
65 rc = -ENOMSG;
66 goto out;
67 }
68
69 /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
70 id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
71 if (id == NULL) {
72 rc = -ENOMEM;
73 goto out;
74 }
75
76 memcpy(id, drive->id, size);
77 ata_id_to_hd_driveid(id);
78
79 if (copy_to_user((void __user *)arg, id, size))
80 rc = -EFAULT;
81
82 kfree(id);
83 out:
84 return rc;
85 }
86
ide_get_nice_ioctl(ide_drive_t * drive,unsigned long arg)87 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
88 {
89 return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
90 << IDE_NICE_DSC_OVERLAP) |
91 (!!(drive->dev_flags & IDE_DFLAG_NICE1)
92 << IDE_NICE_1), (long __user *)arg);
93 }
94
ide_set_nice_ioctl(ide_drive_t * drive,unsigned long arg)95 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
96 {
97 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
98 return -EPERM;
99
100 if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
101 (drive->media != ide_tape))
102 return -EPERM;
103
104 if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
105 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
106 else
107 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
108
109 if ((arg >> IDE_NICE_1) & 1)
110 drive->dev_flags |= IDE_DFLAG_NICE1;
111 else
112 drive->dev_flags &= ~IDE_DFLAG_NICE1;
113
114 return 0;
115 }
116
ide_cmd_ioctl(ide_drive_t * drive,unsigned long arg)117 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
118 {
119 u8 *buf = NULL;
120 int bufsize = 0, err = 0;
121 u8 args[4], xfer_rate = 0;
122 struct ide_cmd cmd;
123 struct ide_taskfile *tf = &cmd.tf;
124
125 if (NULL == (void *) arg) {
126 struct request *rq;
127
128 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
129 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
130 err = blk_execute_rq(drive->queue, NULL, rq, 0);
131 blk_put_request(rq);
132
133 return err;
134 }
135
136 if (copy_from_user(args, (void __user *)arg, 4))
137 return -EFAULT;
138
139 memset(&cmd, 0, sizeof(cmd));
140 tf->feature = args[2];
141 if (args[0] == ATA_CMD_SMART) {
142 tf->nsect = args[3];
143 tf->lbal = args[1];
144 tf->lbam = 0x4f;
145 tf->lbah = 0xc2;
146 cmd.valid.out.tf = IDE_VALID_OUT_TF;
147 cmd.valid.in.tf = IDE_VALID_NSECT;
148 } else {
149 tf->nsect = args[1];
150 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
151 cmd.valid.in.tf = IDE_VALID_NSECT;
152 }
153 tf->command = args[0];
154 cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
155
156 if (args[3]) {
157 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
158 bufsize = SECTOR_SIZE * args[3];
159 buf = kzalloc(bufsize, GFP_KERNEL);
160 if (buf == NULL)
161 return -ENOMEM;
162 }
163
164 if (tf->command == ATA_CMD_SET_FEATURES &&
165 tf->feature == SETFEATURES_XFER &&
166 tf->nsect >= XFER_SW_DMA_0) {
167 xfer_rate = ide_find_dma_mode(drive, tf->nsect);
168 if (xfer_rate != tf->nsect) {
169 err = -EINVAL;
170 goto abort;
171 }
172
173 cmd.tf_flags |= IDE_TFLAG_SET_XFER;
174 }
175
176 err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
177
178 args[0] = tf->status;
179 args[1] = tf->error;
180 args[2] = tf->nsect;
181 abort:
182 if (copy_to_user((void __user *)arg, &args, 4))
183 err = -EFAULT;
184 if (buf) {
185 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
186 err = -EFAULT;
187 kfree(buf);
188 }
189 return err;
190 }
191
ide_task_ioctl(ide_drive_t * drive,unsigned long arg)192 static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
193 {
194 void __user *p = (void __user *)arg;
195 int err = 0;
196 u8 args[7];
197 struct ide_cmd cmd;
198
199 if (copy_from_user(args, p, 7))
200 return -EFAULT;
201
202 memset(&cmd, 0, sizeof(cmd));
203 memcpy(&cmd.tf.feature, &args[1], 6);
204 cmd.tf.command = args[0];
205 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
206 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
207
208 err = ide_no_data_taskfile(drive, &cmd);
209
210 args[0] = cmd.tf.command;
211 memcpy(&args[1], &cmd.tf.feature, 6);
212
213 if (copy_to_user(p, args, 7))
214 err = -EFAULT;
215
216 return err;
217 }
218
generic_drive_reset(ide_drive_t * drive)219 static int generic_drive_reset(ide_drive_t *drive)
220 {
221 struct request *rq;
222 int ret = 0;
223
224 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
225 rq->cmd_type = REQ_TYPE_SPECIAL;
226 rq->cmd_len = 1;
227 rq->cmd[0] = REQ_DRIVE_RESET;
228 if (blk_execute_rq(drive->queue, NULL, rq, 1))
229 ret = rq->errors;
230 blk_put_request(rq);
231 return ret;
232 }
233
generic_ide_ioctl(ide_drive_t * drive,struct block_device * bdev,unsigned int cmd,unsigned long arg)234 int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
235 unsigned int cmd, unsigned long arg)
236 {
237 int err;
238
239 err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
240 if (err != -EOPNOTSUPP)
241 return err;
242
243 switch (cmd) {
244 case HDIO_OBSOLETE_IDENTITY:
245 case HDIO_GET_IDENTITY:
246 if (bdev != bdev->bd_contains)
247 return -EINVAL;
248 return ide_get_identity_ioctl(drive, cmd, arg);
249 case HDIO_GET_NICE:
250 return ide_get_nice_ioctl(drive, arg);
251 case HDIO_SET_NICE:
252 if (!capable(CAP_SYS_ADMIN))
253 return -EACCES;
254 return ide_set_nice_ioctl(drive, arg);
255 #ifdef CONFIG_IDE_TASK_IOCTL
256 case HDIO_DRIVE_TASKFILE:
257 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
258 return -EACCES;
259 if (drive->media == ide_disk)
260 return ide_taskfile_ioctl(drive, arg);
261 return -ENOMSG;
262 #endif
263 case HDIO_DRIVE_CMD:
264 if (!capable(CAP_SYS_RAWIO))
265 return -EACCES;
266 return ide_cmd_ioctl(drive, arg);
267 case HDIO_DRIVE_TASK:
268 if (!capable(CAP_SYS_RAWIO))
269 return -EACCES;
270 return ide_task_ioctl(drive, arg);
271 case HDIO_DRIVE_RESET:
272 if (!capable(CAP_SYS_ADMIN))
273 return -EACCES;
274 return generic_drive_reset(drive);
275 case HDIO_GET_BUSSTATE:
276 if (!capable(CAP_SYS_ADMIN))
277 return -EACCES;
278 if (put_user(BUSSTATE_ON, (long __user *)arg))
279 return -EFAULT;
280 return 0;
281 case HDIO_SET_BUSSTATE:
282 if (!capable(CAP_SYS_ADMIN))
283 return -EACCES;
284 return -EOPNOTSUPP;
285 default:
286 return -EINVAL;
287 }
288 }
289 EXPORT_SYMBOL(generic_ide_ioctl);
290