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
8 DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
9
issue_park_cmd(ide_drive_t * drive,unsigned long timeout)10 static 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(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
61 out:
62 return;
63 }
64
ide_do_park_unpark(ide_drive_t * drive,struct request * rq)65 ide_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
ide_park_show(struct device * dev,struct device_attribute * attr,char * buf)92 ssize_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
ide_park_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)115 ssize_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 }
156