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