Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/gfp.h>
4#include <linux/ide.h>
5#include <linux/jiffies.h>
6#include <linux/blkdev.h>
7
8DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
9
10static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
11{
12 ide_hwif_t *hwif = drive->hwif;
13 struct request_queue *q = drive->queue;
14 struct request *rq;
15 int rc;
16
17 timeout += jiffies;
18 spin_lock_irq(&hwif->lock);
19 if (drive->dev_flags & IDE_DFLAG_PARKED) {
20 int reset_timer = time_before(timeout, drive->sleep);
21 int start_queue = 0;
22
23 drive->sleep = timeout;
24 wake_up_all(&ide_park_wq);
25 if (reset_timer && del_timer(&hwif->timer))
26 start_queue = 1;
27 spin_unlock_irq(&hwif->lock);
28
29 if (start_queue)
30 blk_mq_run_hw_queues(q, true);
31 return;
32 }
33 spin_unlock_irq(&hwif->lock);
34
35 rq = blk_get_request(q, REQ_OP_DRV_IN, 0);
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 ide_req(rq)->special = &timeout;
40 blk_execute_rq(q, NULL, rq, 1);
41 rc = scsi_req(rq)->result ? -EIO : 0;
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, REQ_OP_DRV_IN, BLK_MQ_REQ_NOWAIT);
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 spin_lock_irq(&hwif->lock);
58 ide_insert_request_head(drive, rq);
59 spin_unlock_irq(&hwif->lock);
60
61out:
62 return;
63}
64
65ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
66{
67 struct ide_cmd cmd;
68 struct ide_taskfile *tf = &cmd.tf;
69
70 memset(&cmd, 0, sizeof(cmd));
71 if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
72 drive->sleep = *(unsigned long *)ide_req(rq)->special;
73 drive->dev_flags |= IDE_DFLAG_SLEEPING;
74 tf->command = ATA_CMD_IDLEIMMEDIATE;
75 tf->feature = 0x44;
76 tf->lbal = 0x4c;
77 tf->lbam = 0x4e;
78 tf->lbah = 0x55;
79 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
80 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
81 } else /* cmd == REQ_UNPARK_HEADS */
82 tf->command = ATA_CMD_CHK_POWER;
83
84 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
85 cmd.protocol = ATA_PROT_NODATA;
86
87 cmd.rq = rq;
88
89 return do_rw_taskfile(drive, &cmd);
90}
91
92ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
93 char *buf)
94{
95 ide_drive_t *drive = to_ide_device(dev);
96 ide_hwif_t *hwif = drive->hwif;
97 unsigned long now;
98 unsigned int msecs;
99
100 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
101 return -EOPNOTSUPP;
102
103 spin_lock_irq(&hwif->lock);
104 now = jiffies;
105 if (drive->dev_flags & IDE_DFLAG_PARKED &&
106 time_after(drive->sleep, now))
107 msecs = jiffies_to_msecs(drive->sleep - now);
108 else
109 msecs = 0;
110 spin_unlock_irq(&hwif->lock);
111
112 return snprintf(buf, 20, "%u\n", msecs);
113}
114
115ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
116 const char *buf, size_t len)
117{
118#define MAX_PARK_TIMEOUT 30000
119 ide_drive_t *drive = to_ide_device(dev);
120 long int input;
121 int rc;
122
123 rc = kstrtol(buf, 10, &input);
124 if (rc)
125 return rc;
126 if (input < -2)
127 return -EINVAL;
128 if (input > MAX_PARK_TIMEOUT) {
129 input = MAX_PARK_TIMEOUT;
130 rc = -EOVERFLOW;
131 }
132
133 mutex_lock(&ide_setting_mtx);
134 if (input >= 0) {
135 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
136 rc = -EOPNOTSUPP;
137 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
138 issue_park_cmd(drive, msecs_to_jiffies(input));
139 } else {
140 if (drive->media == ide_disk)
141 switch (input) {
142 case -1:
143 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
144 break;
145 case -2:
146 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
147 break;
148 }
149 else
150 rc = -EOPNOTSUPP;
151 }
152 mutex_unlock(&ide_setting_mtx);
153
154 return rc ? rc : len;
155}
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, READ, __GFP_WAIT);
35 rq->cmd[0] = REQ_PARK_HEADS;
36 rq->cmd_len = 1;
37 rq->cmd_type = REQ_TYPE_SPECIAL;
38 rq->special = &timeout;
39 rc = blk_execute_rq(q, NULL, rq, 1);
40 blk_put_request(rq);
41 if (rc)
42 goto out;
43
44 /*
45 * Make sure that *some* command is sent to the drive after the
46 * timeout has expired, so power management will be reenabled.
47 */
48 rq = blk_get_request(q, READ, GFP_NOWAIT);
49 if (unlikely(!rq))
50 goto out;
51
52 rq->cmd[0] = REQ_UNPARK_HEADS;
53 rq->cmd_len = 1;
54 rq->cmd_type = REQ_TYPE_SPECIAL;
55 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
56
57out:
58 return;
59}
60
61ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
62{
63 struct ide_cmd cmd;
64 struct ide_taskfile *tf = &cmd.tf;
65
66 memset(&cmd, 0, sizeof(cmd));
67 if (rq->cmd[0] == REQ_PARK_HEADS) {
68 drive->sleep = *(unsigned long *)rq->special;
69 drive->dev_flags |= IDE_DFLAG_SLEEPING;
70 tf->command = ATA_CMD_IDLEIMMEDIATE;
71 tf->feature = 0x44;
72 tf->lbal = 0x4c;
73 tf->lbam = 0x4e;
74 tf->lbah = 0x55;
75 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
76 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
77 } else /* cmd == REQ_UNPARK_HEADS */
78 tf->command = ATA_CMD_CHK_POWER;
79
80 cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
81 cmd.protocol = ATA_PROT_NODATA;
82
83 cmd.rq = rq;
84
85 return do_rw_taskfile(drive, &cmd);
86}
87
88ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
89 char *buf)
90{
91 ide_drive_t *drive = to_ide_device(dev);
92 ide_hwif_t *hwif = drive->hwif;
93 unsigned long now;
94 unsigned int msecs;
95
96 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
97 return -EOPNOTSUPP;
98
99 spin_lock_irq(&hwif->lock);
100 now = jiffies;
101 if (drive->dev_flags & IDE_DFLAG_PARKED &&
102 time_after(drive->sleep, now))
103 msecs = jiffies_to_msecs(drive->sleep - now);
104 else
105 msecs = 0;
106 spin_unlock_irq(&hwif->lock);
107
108 return snprintf(buf, 20, "%u\n", msecs);
109}
110
111ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
112 const char *buf, size_t len)
113{
114#define MAX_PARK_TIMEOUT 30000
115 ide_drive_t *drive = to_ide_device(dev);
116 long int input;
117 int rc;
118
119 rc = kstrtol(buf, 10, &input);
120 if (rc)
121 return rc;
122 if (input < -2)
123 return -EINVAL;
124 if (input > MAX_PARK_TIMEOUT) {
125 input = MAX_PARK_TIMEOUT;
126 rc = -EOVERFLOW;
127 }
128
129 mutex_lock(&ide_setting_mtx);
130 if (input >= 0) {
131 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
132 rc = -EOPNOTSUPP;
133 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
134 issue_park_cmd(drive, msecs_to_jiffies(input));
135 } else {
136 if (drive->media == ide_disk)
137 switch (input) {
138 case -1:
139 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
140 break;
141 case -2:
142 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
143 break;
144 }
145 else
146 rc = -EOPNOTSUPP;
147 }
148 mutex_unlock(&ide_setting_mtx);
149
150 return rc ? rc : len;
151}