ide: filter out invalid DMA xfer mode changes in HDIO_DRIVE_CMD ioctl handler
[linux-2.6.git] / drivers / ide / ide-ioctls.c
1 /*
2  * IDE ioctls handling.
3  */
4
5 #include <linux/hdreg.h>
6 #include <linux/ide.h>
7
8 static 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
17 int 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
33 read_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
39 set_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 }
53 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
54
55 static 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         id = kmalloc(size, GFP_KERNEL);
68         if (id == NULL) {
69                 rc = -ENOMEM;
70                 goto out;
71         }
72
73         memcpy(id, drive->id, size);
74         ata_id_to_hd_driveid(id);
75
76         if (copy_to_user((void __user *)arg, id, size))
77                 rc = -EFAULT;
78
79         kfree(id);
80 out:
81         return rc;
82 }
83
84 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
85 {
86         return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
87                          << IDE_NICE_DSC_OVERLAP) |
88                         (!!(drive->dev_flags & IDE_DFLAG_NICE1)
89                          << IDE_NICE_1), (long __user *)arg);
90 }
91
92 static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
93 {
94         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
95                 return -EPERM;
96
97         if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
98             (drive->media != ide_tape))
99                 return -EPERM;
100
101         if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
102                 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
103         else
104                 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
105
106         if ((arg >> IDE_NICE_1) & 1)
107                 drive->dev_flags |= IDE_DFLAG_NICE1;
108         else
109                 drive->dev_flags &= ~IDE_DFLAG_NICE1;
110
111         return 0;
112 }
113
114 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
115 {
116         u8 *buf = NULL;
117         int bufsize = 0, err = 0;
118         u8 args[4], xfer_rate = 0;
119         struct ide_cmd cmd;
120         struct ide_taskfile *tf = &cmd.tf;
121
122         if (NULL == (void *) arg) {
123                 struct request *rq;
124
125                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
126                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
127                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
128                 blk_put_request(rq);
129
130                 return err;
131         }
132
133         if (copy_from_user(args, (void __user *)arg, 4))
134                 return -EFAULT;
135
136         memset(&cmd, 0, sizeof(cmd));
137         tf->feature = args[2];
138         if (args[0] == ATA_CMD_SMART) {
139                 tf->nsect = args[3];
140                 tf->lbal  = args[1];
141                 tf->lbam  = 0x4f;
142                 tf->lbah  = 0xc2;
143                 cmd.valid.out.tf = IDE_VALID_OUT_TF;
144                 cmd.valid.in.tf  = IDE_VALID_NSECT;
145         } else {
146                 tf->nsect = args[1];
147                 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
148                 cmd.valid.in.tf  = IDE_VALID_NSECT;
149         }
150         tf->command = args[0];
151         cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
152
153         if (args[3]) {
154                 cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
155                 bufsize = SECTOR_SIZE * args[3];
156                 buf = kzalloc(bufsize, GFP_KERNEL);
157                 if (buf == NULL)
158                         return -ENOMEM;
159         }
160
161         if (tf->command == ATA_CMD_SET_FEATURES &&
162             tf->feature == SETFEATURES_XFER &&
163             tf->nsect >= XFER_SW_DMA_0) {
164                 xfer_rate = ide_find_dma_mode(drive, XFER_UDMA_6);
165                 if (xfer_rate != tf->nsect) {
166                         err = -EINVAL;
167                         goto abort;
168                 }
169         }
170
171         err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
172
173         args[0] = tf->status;
174         args[1] = tf->error;
175         args[2] = tf->nsect;
176
177         if (!err && xfer_rate) {
178                 /* active-retuning-calls future */
179                 ide_set_xfer_rate(drive, xfer_rate);
180                 ide_driveid_update(drive);
181         }
182 abort:
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
193 static 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
220 static 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, READ, __GFP_WAIT);
226         rq->cmd_type = REQ_TYPE_SPECIAL;
227         rq->cmd_len = 1;
228         rq->cmd[0] = REQ_DRIVE_RESET;
229         if (blk_execute_rq(drive->queue, NULL, rq, 1))
230                 ret = rq->errors;
231         blk_put_request(rq);
232         return ret;
233 }
234
235 int 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 }
290 EXPORT_SYMBOL(generic_ide_ioctl);