ide: remove CONFIG_BLK_DEV_IDE config option (take 2)
[linux-2.6] / 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         unsigned long flags;
23         int err = -EOPNOTSUPP;
24
25         for (; (ds = s->setting); s++) {
26                 if (ds->get && s->get_ioctl == cmd)
27                         goto read_val;
28                 else if (ds->set && s->set_ioctl == cmd)
29                         goto set_val;
30         }
31
32         return err;
33
34 read_val:
35         mutex_lock(&ide_setting_mtx);
36         spin_lock_irqsave(&ide_lock, flags);
37         err = ds->get(drive);
38         spin_unlock_irqrestore(&ide_lock, flags);
39         mutex_unlock(&ide_setting_mtx);
40         return err >= 0 ? put_user(err, (long __user *)arg) : err;
41
42 set_val:
43         if (bdev != bdev->bd_contains)
44                 err = -EINVAL;
45         else {
46                 if (!capable(CAP_SYS_ADMIN))
47                         err = -EACCES;
48                 else {
49                         mutex_lock(&ide_setting_mtx);
50                         err = ide_devset_execute(drive, ds, arg);
51                         mutex_unlock(&ide_setting_mtx);
52                 }
53         }
54         return err;
55 }
56 EXPORT_SYMBOL_GPL(ide_setting_ioctl);
57
58 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
59                                   unsigned long arg)
60 {
61         u16 *id = NULL;
62         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
63         int rc = 0;
64
65         if (drive->id_read == 0) {
66                 rc = -ENOMSG;
67                 goto out;
68         }
69
70         id = kmalloc(size, 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
87 static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
88 {
89         return put_user((drive->dsc_overlap << IDE_NICE_DSC_OVERLAP) |
90                         (drive->nice1 << IDE_NICE_1), (long __user *)arg);
91 }
92
93 static 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_disk || drive->media == ide_floppy ||
100              drive->scsi))
101                 return -EPERM;
102
103         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
104         drive->nice1 = (arg >> IDE_NICE_1) & 1;
105
106         return 0;
107 }
108
109 static int ide_cmd_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
110 {
111         u8 *buf = NULL;
112         int bufsize = 0, err = 0;
113         u8 args[4], xfer_rate = 0;
114         ide_task_t tfargs;
115         struct ide_taskfile *tf = &tfargs.tf;
116         u16 *id = drive->id;
117
118         if (NULL == (void *) arg) {
119                 struct request *rq;
120
121                 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
122                 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
123                 err = blk_execute_rq(drive->queue, NULL, rq, 0);
124                 blk_put_request(rq);
125
126                 return err;
127         }
128
129         if (copy_from_user(args, (void __user *)arg, 4))
130                 return -EFAULT;
131
132         memset(&tfargs, 0, sizeof(ide_task_t));
133         tf->feature = args[2];
134         if (args[0] == ATA_CMD_SMART) {
135                 tf->nsect = args[3];
136                 tf->lbal  = args[1];
137                 tf->lbam  = 0x4f;
138                 tf->lbah  = 0xc2;
139                 tfargs.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT;
140         } else {
141                 tf->nsect = args[1];
142                 tfargs.tf_flags = IDE_TFLAG_OUT_FEATURE |
143                                   IDE_TFLAG_OUT_NSECT | IDE_TFLAG_IN_NSECT;
144         }
145         tf->command = args[0];
146         tfargs.data_phase = args[3] ? TASKFILE_IN : TASKFILE_NO_DATA;
147
148         if (args[3]) {
149                 tfargs.tf_flags |= IDE_TFLAG_IO_16BIT;
150                 bufsize = SECTOR_SIZE * args[3];
151                 buf = kzalloc(bufsize, GFP_KERNEL);
152                 if (buf == NULL)
153                         return -ENOMEM;
154         }
155
156         if (tf->command == ATA_CMD_SET_FEATURES &&
157             tf->feature == SETFEATURES_XFER &&
158             tf->nsect >= XFER_SW_DMA_0 &&
159             (id[ATA_ID_UDMA_MODES] ||
160              id[ATA_ID_MWDMA_MODES] ||
161              id[ATA_ID_SWDMA_MODES])) {
162                 xfer_rate = args[1];
163                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
164                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
165                                             "be set\n", drive->name);
166                         goto abort;
167                 }
168         }
169
170         err = ide_raw_taskfile(drive, &tfargs, buf, args[3]);
171
172         args[0] = tf->status;
173         args[1] = tf->error;
174         args[2] = tf->nsect;
175
176         if (!err && xfer_rate) {
177                 /* active-retuning-calls future */
178                 ide_set_xfer_rate(drive, xfer_rate);
179                 ide_driveid_update(drive);
180         }
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
192 static int ide_task_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg)
193 {
194         void __user *p = (void __user *)arg;
195         int err = 0;
196         u8 args[7];
197         ide_task_t task;
198
199         if (copy_from_user(args, p, 7))
200                 return -EFAULT;
201
202         memset(&task, 0, sizeof(task));
203         memcpy(&task.tf_array[7], &args[1], 6);
204         task.tf.command = args[0];
205         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
206
207         err = ide_no_data_taskfile(drive, &task);
208
209         args[0] = task.tf.command;
210         memcpy(&args[1], &task.tf_array[7], 6);
211
212         if (copy_to_user(p, args, 7))
213                 err = -EFAULT;
214
215         return err;
216 }
217
218 static int generic_drive_reset(ide_drive_t *drive)
219 {
220         struct request *rq;
221         int ret = 0;
222
223         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
224         rq->cmd_type = REQ_TYPE_SPECIAL;
225         rq->cmd_len = 1;
226         rq->cmd[0] = REQ_DRIVE_RESET;
227         rq->cmd_flags |= REQ_SOFTBARRIER;
228         if (blk_execute_rq(drive->queue, NULL, rq, 1))
229                 ret = rq->errors;
230         blk_put_request(rq);
231         return ret;
232 }
233
234 int generic_ide_ioctl(ide_drive_t *drive, struct file *file,
235                       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, cmd, 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, cmd, arg);
268         case HDIO_DRIVE_TASK:
269                 if (!capable(CAP_SYS_RAWIO))
270                         return -EACCES;
271                 return ide_task_ioctl(drive, cmd, 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);