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/export.h>
6#include <linux/hdreg.h>
7#include <linux/ide.h>
8#include <linux/slab.h>
9
10static 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
19int 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
35read_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
41set_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}
55EXPORT_SYMBOL_GPL(ide_setting_ioctl);
56
57static 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);
83out:
84 return rc;
85}
86
87static 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
95static 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
117static 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, REQ_OP_DRV_IN, __GFP_RECLAIM);
129 ide_req(rq)->type = ATA_PRIV_TASKFILE;
130 blk_execute_rq(drive->queue, NULL, rq, 0);
131 err = scsi_req(rq)->result ? -EIO : 0;
132 blk_put_request(rq);
133
134 return err;
135 }
136
137 if (copy_from_user(args, (void __user *)arg, 4))
138 return -EFAULT;
139
140 memset(&cmd, 0, sizeof(cmd));
141 tf->feature = args[2];
142 if (args[0] == ATA_CMD_SMART) {
143 tf->nsect = args[3];
144 tf->lbal = args[1];
145 tf->lbam = ATA_SMART_LBAM_PASS;
146 tf->lbah = ATA_SMART_LBAH_PASS;
147 cmd.valid.out.tf = IDE_VALID_OUT_TF;
148 cmd.valid.in.tf = IDE_VALID_NSECT;
149 } else {
150 tf->nsect = args[1];
151 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
152 cmd.valid.in.tf = IDE_VALID_NSECT;
153 }
154 tf->command = args[0];
155 cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
156
157 if (args[3]) {
158 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
159 bufsize = SECTOR_SIZE * args[3];
160 buf = kzalloc(bufsize, GFP_KERNEL);
161 if (buf == NULL)
162 return -ENOMEM;
163 }
164
165 if (tf->command == ATA_CMD_SET_FEATURES &&
166 tf->feature == SETFEATURES_XFER &&
167 tf->nsect >= XFER_SW_DMA_0) {
168 xfer_rate = ide_find_dma_mode(drive, tf->nsect);
169 if (xfer_rate != tf->nsect) {
170 err = -EINVAL;
171 goto abort;
172 }
173
174 cmd.tf_flags |= IDE_TFLAG_SET_XFER;
175 }
176
177 err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
178
179 args[0] = tf->status;
180 args[1] = tf->error;
181 args[2] = tf->nsect;
182abort:
183 if (copy_to_user((void __user *)arg, &args, 4))
184 err = -EFAULT;
185 if (buf) {
186 if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
187 err = -EFAULT;
188 kfree(buf);
189 }
190 return err;
191}
192
193static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
194{
195 void __user *p = (void __user *)arg;
196 int err = 0;
197 u8 args[7];
198 struct ide_cmd cmd;
199
200 if (copy_from_user(args, p, 7))
201 return -EFAULT;
202
203 memset(&cmd, 0, sizeof(cmd));
204 memcpy(&cmd.tf.feature, &args[1], 6);
205 cmd.tf.command = args[0];
206 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
207 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
208
209 err = ide_no_data_taskfile(drive, &cmd);
210
211 args[0] = cmd.tf.command;
212 memcpy(&args[1], &cmd.tf.feature, 6);
213
214 if (copy_to_user(p, args, 7))
215 err = -EFAULT;
216
217 return err;
218}
219
220static int generic_drive_reset(ide_drive_t *drive)
221{
222 struct request *rq;
223 int ret = 0;
224
225 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
226 ide_req(rq)->type = ATA_PRIV_MISC;
227 scsi_req(rq)->cmd_len = 1;
228 scsi_req(rq)->cmd[0] = REQ_DRIVE_RESET;
229 blk_execute_rq(drive->queue, NULL, rq, 1);
230 ret = scsi_req(rq)->result;
231 blk_put_request(rq);
232 return ret;
233}
234
235int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
236 unsigned int cmd, unsigned long arg)
237{
238 int err;
239
240 err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
241 if (err != -EOPNOTSUPP)
242 return err;
243
244 switch (cmd) {
245 case HDIO_OBSOLETE_IDENTITY:
246 case HDIO_GET_IDENTITY:
247 if (bdev != bdev->bd_contains)
248 return -EINVAL;
249 return ide_get_identity_ioctl(drive, cmd, arg);
250 case HDIO_GET_NICE:
251 return ide_get_nice_ioctl(drive, arg);
252 case HDIO_SET_NICE:
253 if (!capable(CAP_SYS_ADMIN))
254 return -EACCES;
255 return ide_set_nice_ioctl(drive, arg);
256#ifdef CONFIG_IDE_TASK_IOCTL
257 case HDIO_DRIVE_TASKFILE:
258 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
259 return -EACCES;
260 if (drive->media == ide_disk)
261 return ide_taskfile_ioctl(drive, arg);
262 return -ENOMSG;
263#endif
264 case HDIO_DRIVE_CMD:
265 if (!capable(CAP_SYS_RAWIO))
266 return -EACCES;
267 return ide_cmd_ioctl(drive, arg);
268 case HDIO_DRIVE_TASK:
269 if (!capable(CAP_SYS_RAWIO))
270 return -EACCES;
271 return ide_task_ioctl(drive, arg);
272 case HDIO_DRIVE_RESET:
273 if (!capable(CAP_SYS_ADMIN))
274 return -EACCES;
275 return generic_drive_reset(drive);
276 case HDIO_GET_BUSSTATE:
277 if (!capable(CAP_SYS_ADMIN))
278 return -EACCES;
279 if (put_user(BUSSTATE_ON, (long __user *)arg))
280 return -EFAULT;
281 return 0;
282 case HDIO_SET_BUSSTATE:
283 if (!capable(CAP_SYS_ADMIN))
284 return -EACCES;
285 return -EOPNOTSUPP;
286 default:
287 return -EINVAL;
288 }
289}
290EXPORT_SYMBOL(generic_ide_ioctl);