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Commit | Line | Data |
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4abdc6ee EO |
1 | #include <linux/kernel.h> |
2 | #include <linux/ide.h> | |
3 | #include <linux/jiffies.h> | |
4 | #include <linux/blkdev.h> | |
5 | ||
6 | DECLARE_WAIT_QUEUE_HEAD(ide_park_wq); | |
7 | ||
8 | static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout) | |
9 | { | |
b65fac32 | 10 | ide_hwif_t *hwif = drive->hwif; |
4abdc6ee EO |
11 | struct request_queue *q = drive->queue; |
12 | struct request *rq; | |
13 | int rc; | |
14 | ||
15 | timeout += jiffies; | |
b65fac32 | 16 | spin_lock_irq(&hwif->lock); |
4abdc6ee | 17 | if (drive->dev_flags & IDE_DFLAG_PARKED) { |
2a2ca6a9 | 18 | int reset_timer = time_before(timeout, drive->sleep); |
201bffa4 | 19 | int start_queue = 0; |
4abdc6ee | 20 | |
4abdc6ee EO |
21 | drive->sleep = timeout; |
22 | wake_up_all(&ide_park_wq); | |
b65fac32 | 23 | if (reset_timer && del_timer(&hwif->timer)) |
201bffa4 | 24 | start_queue = 1; |
b65fac32 | 25 | spin_unlock_irq(&hwif->lock); |
201bffa4 BZ |
26 | |
27 | if (start_queue) { | |
28 | spin_lock_irq(q->queue_lock); | |
4abdc6ee | 29 | blk_start_queueing(q); |
201bffa4 | 30 | spin_unlock_irq(q->queue_lock); |
4abdc6ee | 31 | } |
4abdc6ee EO |
32 | return; |
33 | } | |
b65fac32 | 34 | spin_unlock_irq(&hwif->lock); |
4abdc6ee EO |
35 | |
36 | rq = blk_get_request(q, READ, __GFP_WAIT); | |
37 | rq->cmd[0] = REQ_PARK_HEADS; | |
38 | rq->cmd_len = 1; | |
39 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
40 | rq->special = &timeout; | |
41 | rc = blk_execute_rq(q, NULL, rq, 1); | |
42 | blk_put_request(rq); | |
43 | if (rc) | |
44 | goto out; | |
45 | ||
46 | /* | |
47 | * Make sure that *some* command is sent to the drive after the | |
48 | * timeout has expired, so power management will be reenabled. | |
49 | */ | |
50 | rq = blk_get_request(q, READ, GFP_NOWAIT); | |
51 | if (unlikely(!rq)) | |
52 | goto out; | |
53 | ||
54 | rq->cmd[0] = REQ_UNPARK_HEADS; | |
55 | rq->cmd_len = 1; | |
56 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
57 | elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1); | |
58 | ||
59 | out: | |
60 | return; | |
61 | } | |
62 | ||
63 | ssize_t ide_park_show(struct device *dev, struct device_attribute *attr, | |
64 | char *buf) | |
65 | { | |
66 | ide_drive_t *drive = to_ide_device(dev); | |
b65fac32 | 67 | ide_hwif_t *hwif = drive->hwif; |
4abdc6ee EO |
68 | unsigned long now; |
69 | unsigned int msecs; | |
70 | ||
71 | if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) | |
72 | return -EOPNOTSUPP; | |
73 | ||
b65fac32 | 74 | spin_lock_irq(&hwif->lock); |
4abdc6ee EO |
75 | now = jiffies; |
76 | if (drive->dev_flags & IDE_DFLAG_PARKED && | |
77 | time_after(drive->sleep, now)) | |
78 | msecs = jiffies_to_msecs(drive->sleep - now); | |
79 | else | |
80 | msecs = 0; | |
b65fac32 | 81 | spin_unlock_irq(&hwif->lock); |
4abdc6ee EO |
82 | |
83 | return snprintf(buf, 20, "%u\n", msecs); | |
84 | } | |
85 | ||
86 | ssize_t ide_park_store(struct device *dev, struct device_attribute *attr, | |
87 | const char *buf, size_t len) | |
88 | { | |
89 | #define MAX_PARK_TIMEOUT 30000 | |
90 | ide_drive_t *drive = to_ide_device(dev); | |
91 | long int input; | |
92 | int rc; | |
93 | ||
94 | rc = strict_strtol(buf, 10, &input); | |
95 | if (rc || input < -2) | |
96 | return -EINVAL; | |
97 | if (input > MAX_PARK_TIMEOUT) { | |
98 | input = MAX_PARK_TIMEOUT; | |
99 | rc = -EOVERFLOW; | |
100 | } | |
101 | ||
102 | mutex_lock(&ide_setting_mtx); | |
103 | if (input >= 0) { | |
104 | if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) | |
105 | rc = -EOPNOTSUPP; | |
106 | else if (input || drive->dev_flags & IDE_DFLAG_PARKED) | |
107 | issue_park_cmd(drive, msecs_to_jiffies(input)); | |
108 | } else { | |
109 | if (drive->media == ide_disk) | |
110 | switch (input) { | |
111 | case -1: | |
112 | drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD; | |
113 | break; | |
114 | case -2: | |
115 | drive->dev_flags |= IDE_DFLAG_NO_UNLOAD; | |
116 | break; | |
117 | } | |
118 | else | |
119 | rc = -EOPNOTSUPP; | |
120 | } | |
121 | mutex_unlock(&ide_setting_mtx); | |
122 | ||
123 | return rc ? rc : len; | |
124 | } |