1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/kernel.h>
4#include <linux/gfp.h>
5#include <linux/ide.h>
6
7DEFINE_MUTEX(ide_setting_mtx);
8
9ide_devset_get(io_32bit, io_32bit);
10
11static int set_io_32bit(ide_drive_t *drive, int arg)
12{
13	if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
14		return -EPERM;
15
16	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
17		return -EINVAL;
18
19	drive->io_32bit = arg;
20
21	return 0;
22}
23
24ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
25
26static int set_ksettings(ide_drive_t *drive, int arg)
27{
28	if (arg < 0 || arg > 1)
29		return -EINVAL;
30
31	if (arg)
32		drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
33	else
34		drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
35
36	return 0;
37}
38
39ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
40
41static int set_using_dma(ide_drive_t *drive, int arg)
42{
43#ifdef CONFIG_BLK_DEV_IDEDMA
44	int err = -EPERM;
45
46	if (arg < 0 || arg > 1)
47		return -EINVAL;
48
49	if (ata_id_has_dma(drive->id) == 0)
50		goto out;
51
52	if (drive->hwif->dma_ops == NULL)
53		goto out;
54
55	err = 0;
56
57	if (arg) {
58		if (ide_set_dma(drive))
59			err = -EIO;
60	} else
61		ide_dma_off(drive);
62
63out:
64	return err;
65#else
66	if (arg < 0 || arg > 1)
67		return -EINVAL;
68
69	return -EPERM;
70#endif
71}
72
73/*
74 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
75 */
76static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
77{
78	switch (req_pio) {
79	case 202:
80	case 201:
81	case 200:
82	case 102:
83	case 101:
84	case 100:
85		return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
86	case 9:
87	case 8:
88		return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
89	case 7:
90	case 6:
91		return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
92	default:
93		return 0;
94	}
95}
96
97static int set_pio_mode(ide_drive_t *drive, int arg)
98{
99	ide_hwif_t *hwif = drive->hwif;
100	const struct ide_port_ops *port_ops = hwif->port_ops;
101
102	if (arg < 0 || arg > 255)
103		return -EINVAL;
104
105	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
106	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
107		return -ENOSYS;
108
109	if (set_pio_mode_abuse(drive->hwif, arg)) {
110		drive->pio_mode = arg + XFER_PIO_0;
111
112		if (arg == 8 || arg == 9) {
113			unsigned long flags;
114
115			/* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
116			spin_lock_irqsave(&hwif->lock, flags);
117			port_ops->set_pio_mode(hwif, drive);
118			spin_unlock_irqrestore(&hwif->lock, flags);
119		} else
120			port_ops->set_pio_mode(hwif, drive);
121	} else {
122		int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
123
124		ide_set_pio(drive, arg);
125
126		if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
127			if (keep_dma)
128				ide_dma_on(drive);
129		}
130	}
131
132	return 0;
133}
134
135ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
136
137static int set_unmaskirq(ide_drive_t *drive, int arg)
138{
139	if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
140		return -EPERM;
141
142	if (arg < 0 || arg > 1)
143		return -EINVAL;
144
145	if (arg)
146		drive->dev_flags |= IDE_DFLAG_UNMASK;
147	else
148		drive->dev_flags &= ~IDE_DFLAG_UNMASK;
149
150	return 0;
151}
152
153ide_ext_devset_rw_sync(io_32bit, io_32bit);
154ide_ext_devset_rw_sync(keepsettings, ksettings);
155ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
156ide_ext_devset_rw_sync(using_dma, using_dma);
157__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
158
159int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
160		       int arg)
161{
162	struct request_queue *q = drive->queue;
163	struct request *rq;
164	int ret = 0;
165
166	if (!(setting->flags & DS_SYNC))
167		return setting->set(drive, arg);
168
169	rq = blk_get_request(q, REQ_OP_DRV_IN, 0);
170	ide_req(rq)->type = ATA_PRIV_MISC;
171	scsi_req(rq)->cmd_len = 5;
172	scsi_req(rq)->cmd[0] = REQ_DEVSET_EXEC;
173	*(int *)&scsi_req(rq)->cmd[1] = arg;
174	ide_req(rq)->special = setting->set;
175
176	blk_execute_rq(q, NULL, rq, 0);
177	ret = scsi_req(rq)->result;
178	blk_put_request(rq);
179
180	return ret;
181}
182
183ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
184{
185	int err, (*setfunc)(ide_drive_t *, int) = ide_req(rq)->special;
186
187	err = setfunc(drive, *(int *)&scsi_req(rq)->cmd[1]);
188	if (err)
189		scsi_req(rq)->result = err;
190	ide_complete_rq(drive, 0, blk_rq_bytes(rq));
191	return ide_stopped;
192}
193