tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/kernel.h>
2#include <linux/gfp.h>
3#include <linux/ide.h>
4#include <linux/jiffies.h>
5#include <linux/blkdev.h>
6
7DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
8
9static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
10{
11 ide_hwif_t *hwif = drive->hwif;
12 struct request_queue *q = drive->queue;
13 struct request *rq;
14 int rc;
15
16 timeout += jiffies;
17 spin_lock_irq(&hwif->lock);
18 if (drive->dev_flags & IDE_DFLAG_PARKED) {
19 int reset_timer = time_before(timeout, drive->sleep);
20 int start_queue = 0;
21
22 drive->sleep = timeout;
23 wake_up_all(&ide_park_wq);
24 if (reset_timer && del_timer(&hwif->timer))
25 start_queue = 1;
26 spin_unlock_irq(&hwif->lock);
27
28 if (start_queue)
29 blk_run_queue(q);
30 return;
31 }
32 spin_unlock_irq(&hwif->lock);
33
34 rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);
35 scsi_req_init(rq);
36 scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
37 scsi_req(rq)->cmd_len = 1;
38 ide_req(rq)->type = ATA_PRIV_MISC;
39 rq->special = &timeout;
40 rc = blk_execute_rq(q, NULL, rq, 1);
41 blk_put_request(rq);
42 if (rc)
43 goto out;
44
45 /*
46 * Make sure that *some* command is sent to the drive after the
47 * timeout has expired, so power management will be reenabled.
48 */
49 rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT);
50 scsi_req_init(rq);
51 if (IS_ERR(rq))
52 goto out;
53
54 scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
55 scsi_req(rq)->cmd_len = 1;
56 ide_req(rq)->type = ATA_PRIV_MISC;
57 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
58
59out:
60 return;
61}
62
63ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
64{
65 struct ide_cmd cmd;
66 struct ide_taskfile *tf = &cmd.tf;
67
68 memset(&cmd, 0, sizeof(cmd));
69 if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
70 drive->sleep = *(unsigned long *)rq->special;
71 drive->dev_flags |= IDE_DFLAG_SLEEPING;
72 tf->command = ATA_CMD_IDLEIMMEDIATE;
73 tf->feature = 0x44;
74 tf->lbal = 0x4c;
75 tf->lbam = 0x4e;
76 tf->lbah = 0x55;
77 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
78 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
79 } else /* cmd == REQ_UNPARK_HEADS */
80 tf->command = ATA_CMD_CHK_POWER;
81
82 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
83 cmd.protocol = ATA_PROT_NODATA;
84
85 cmd.rq = rq;
86
87 return do_rw_taskfile(drive, &cmd);
88}
89
90ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
91 char *buf)
92{
93 ide_drive_t *drive = to_ide_device(dev);
94 ide_hwif_t *hwif = drive->hwif;
95 unsigned long now;
96 unsigned int msecs;
97
98 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
99 return -EOPNOTSUPP;
100
101 spin_lock_irq(&hwif->lock);
102 now = jiffies;
103 if (drive->dev_flags & IDE_DFLAG_PARKED &&
104 time_after(drive->sleep, now))
105 msecs = jiffies_to_msecs(drive->sleep - now);
106 else
107 msecs = 0;
108 spin_unlock_irq(&hwif->lock);
109
110 return snprintf(buf, 20, "%u\n", msecs);
111}
112
113ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
114 const char *buf, size_t len)
115{
116#define MAX_PARK_TIMEOUT 30000
117 ide_drive_t *drive = to_ide_device(dev);
118 long int input;
119 int rc;
120
121 rc = kstrtol(buf, 10, &input);
122 if (rc)
123 return rc;
124 if (input < -2)
125 return -EINVAL;
126 if (input > MAX_PARK_TIMEOUT) {
127 input = MAX_PARK_TIMEOUT;
128 rc = -EOVERFLOW;
129 }
130
131 mutex_lock(&ide_setting_mtx);
132 if (input >= 0) {
133 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
134 rc = -EOPNOTSUPP;
135 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
136 issue_park_cmd(drive, msecs_to_jiffies(input));
137 } else {
138 if (drive->media == ide_disk)
139 switch (input) {
140 case -1:
141 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
142 break;
143 case -2:
144 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
145 break;
146 }
147 else
148 rc = -EOPNOTSUPP;
149 }
150 mutex_unlock(&ide_setting_mtx);
151
152 return rc ? rc : len;
153}