1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/kernel.h>
4 #include <linux/export.h>
6 #include <linux/delay.h>
8 static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq,
11 ide_hwif_t *hwif = drive->hwif;
13 if ((stat & ATA_BUSY) ||
14 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
15 /* other bits are useless when BUSY */
16 scsi_req(rq)->result |= ERROR_RESET;
17 } else if (stat & ATA_ERR) {
18 /* err has different meaning on cdrom and tape */
19 if (err == ATA_ABORTED) {
20 if ((drive->dev_flags & IDE_DFLAG_LBA) &&
21 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
22 hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
24 } else if ((err & BAD_CRC) == BAD_CRC) {
25 /* UDMA crc error, just retry the operation */
27 } else if (err & (ATA_BBK | ATA_UNC)) {
28 /* retries won't help these */
29 scsi_req(rq)->result = ERROR_MAX;
30 } else if (err & ATA_TRK0NF) {
31 /* help it find track zero */
32 scsi_req(rq)->result |= ERROR_RECAL;
36 if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
37 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
38 int nsect = drive->mult_count ? drive->mult_count : 1;
40 ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
43 if (scsi_req(rq)->result >= ERROR_MAX || blk_noretry_request(rq)) {
44 ide_kill_rq(drive, rq);
48 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
49 scsi_req(rq)->result |= ERROR_RESET;
51 if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
52 ++scsi_req(rq)->result;
53 return ide_do_reset(drive);
56 if ((scsi_req(rq)->result & ERROR_RECAL) == ERROR_RECAL)
57 drive->special_flags |= IDE_SFLAG_RECALIBRATE;
59 ++scsi_req(rq)->result;
64 static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq,
67 ide_hwif_t *hwif = drive->hwif;
69 if ((stat & ATA_BUSY) ||
70 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
71 /* other bits are useless when BUSY */
72 scsi_req(rq)->result |= ERROR_RESET;
74 /* add decoding error stuff */
77 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
79 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
81 if (scsi_req(rq)->result >= ERROR_MAX) {
82 ide_kill_rq(drive, rq);
84 if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
85 ++scsi_req(rq)->result;
86 return ide_do_reset(drive);
88 ++scsi_req(rq)->result;
94 static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq,
97 if (drive->media == ide_disk)
98 return ide_ata_error(drive, rq, stat, err);
99 return ide_atapi_error(drive, rq, stat, err);
103 * ide_error - handle an error on the IDE
104 * @drive: drive the error occurred on
105 * @msg: message to report
108 * ide_error() takes action based on the error returned by the drive.
109 * For normal I/O that may well include retries. We deal with
110 * both new-style (taskfile) and old style command handling here.
111 * In the case of taskfile command handling there is work left to
115 ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
120 err = ide_dump_status(drive, msg, stat);
122 rq = drive->hwif->rq;
126 /* retry only "normal" I/O: */
127 if (blk_rq_is_passthrough(rq)) {
128 if (ata_taskfile_request(rq)) {
129 struct ide_cmd *cmd = ide_req(rq)->special;
132 ide_complete_cmd(drive, cmd, stat, err);
133 } else if (ata_pm_request(rq)) {
134 scsi_req(rq)->result = 1;
135 ide_complete_pm_rq(drive, rq);
138 scsi_req(rq)->result = err;
139 ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq));
143 return __ide_error(drive, rq, stat, err);
145 EXPORT_SYMBOL_GPL(ide_error);
147 static inline void ide_complete_drive_reset(ide_drive_t *drive, blk_status_t err)
149 struct request *rq = drive->hwif->rq;
151 if (rq && ata_misc_request(rq) &&
152 scsi_req(rq)->cmd[0] == REQ_DRIVE_RESET) {
153 if (err <= 0 && scsi_req(rq)->result == 0)
154 scsi_req(rq)->result = -EIO;
155 ide_complete_rq(drive, err, blk_rq_bytes(rq));
160 static ide_startstop_t do_reset1(ide_drive_t *, int);
163 * atapi_reset_pollfunc() gets invoked to poll the interface for completion
164 * every 50ms during an atapi drive reset operation. If the drive has not yet
165 * responded, and we have not yet hit our maximum waiting time, then the timer
166 * is restarted for another 50ms.
168 static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
170 ide_hwif_t *hwif = drive->hwif;
171 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
174 tp_ops->dev_select(drive);
176 stat = tp_ops->read_status(hwif);
178 if (OK_STAT(stat, 0, ATA_BUSY))
179 printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
181 if (time_before(jiffies, hwif->poll_timeout)) {
182 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
183 /* continue polling */
188 printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
190 /* do it the old fashioned way */
191 return do_reset1(drive, 1);
195 ide_complete_drive_reset(drive, BLK_STS_OK);
199 static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
201 static const char *err_master_vals[] =
202 { NULL, "passed", "formatter device error",
203 "sector buffer error", "ECC circuitry error",
204 "controlling MPU error" };
206 u8 err_master = err & 0x7f;
208 printk(KERN_ERR "%s: reset: master: ", hwif->name);
209 if (err_master && err_master < 6)
210 printk(KERN_CONT "%s", err_master_vals[err_master]);
212 printk(KERN_CONT "error (0x%02x?)", err);
214 printk(KERN_CONT "; slave: failed");
215 printk(KERN_CONT "\n");
219 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
220 * during an ide reset operation. If the drives have not yet responded,
221 * and we have not yet hit our maximum waiting time, then the timer is restarted
224 static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
226 ide_hwif_t *hwif = drive->hwif;
227 const struct ide_port_ops *port_ops = hwif->port_ops;
229 blk_status_t err = BLK_STS_OK;
231 if (port_ops && port_ops->reset_poll) {
232 err = port_ops->reset_poll(drive);
234 printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
235 hwif->name, drive->name);
240 tmp = hwif->tp_ops->read_status(hwif);
242 if (!OK_STAT(tmp, 0, ATA_BUSY)) {
243 if (time_before(jiffies, hwif->poll_timeout)) {
244 ide_set_handler(drive, &reset_pollfunc, HZ/20);
245 /* continue polling */
248 printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
253 tmp = ide_read_error(drive);
256 printk(KERN_INFO "%s: reset: success\n", hwif->name);
259 ide_reset_report_error(hwif, tmp);
265 hwif->polling = 0; /* done polling */
266 ide_complete_drive_reset(drive, err);
270 static void ide_disk_pre_reset(ide_drive_t *drive)
272 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
274 drive->special_flags =
275 legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0;
277 drive->mult_count = 0;
278 drive->dev_flags &= ~IDE_DFLAG_PARKED;
280 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
281 (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
284 if (drive->mult_req != drive->mult_count)
285 drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
288 static void pre_reset(ide_drive_t *drive)
290 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
292 if (drive->media == ide_disk)
293 ide_disk_pre_reset(drive);
295 drive->dev_flags |= IDE_DFLAG_POST_RESET;
297 if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
298 if (drive->crc_count)
299 ide_check_dma_crc(drive);
304 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
305 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
306 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
312 if (port_ops && port_ops->pre_reset)
313 port_ops->pre_reset(drive);
315 if (drive->current_speed != 0xff)
316 drive->desired_speed = drive->current_speed;
317 drive->current_speed = 0xff;
321 * do_reset1() attempts to recover a confused drive by resetting it.
322 * Unfortunately, resetting a disk drive actually resets all devices on
323 * the same interface, so it can really be thought of as resetting the
324 * interface rather than resetting the drive.
326 * ATAPI devices have their own reset mechanism which allows them to be
327 * individually reset without clobbering other devices on the same interface.
329 * Unfortunately, the IDE interface does not generate an interrupt to let
330 * us know when the reset operation has finished, so we must poll for this.
331 * Equally poor, though, is the fact that this may a very long time to complete,
332 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
333 * we set a timer to poll at 50ms intervals.
335 static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
337 ide_hwif_t *hwif = drive->hwif;
338 struct ide_io_ports *io_ports = &hwif->io_ports;
339 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
340 const struct ide_port_ops *port_ops;
342 unsigned long flags, timeout;
346 spin_lock_irqsave(&hwif->lock, flags);
348 /* We must not reset with running handlers */
349 BUG_ON(hwif->handler != NULL);
351 /* For an ATAPI device, first try an ATAPI SRST. */
352 if (drive->media != ide_disk && !do_not_try_atapi) {
354 tp_ops->dev_select(drive);
356 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
358 hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
360 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
361 spin_unlock_irqrestore(&hwif->lock, flags);
365 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
369 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
371 ide_port_for_each_present_dev(i, tdrive, hwif) {
372 if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
373 time_after(tdrive->sleep, timeout))
374 timeout = tdrive->sleep;
378 if (time_before_eq(timeout, now))
381 spin_unlock_irqrestore(&hwif->lock, flags);
382 timeout = schedule_timeout_uninterruptible(timeout - now);
383 spin_lock_irqsave(&hwif->lock, flags);
385 finish_wait(&ide_park_wq, &wait);
388 * First, reset any device state data we were maintaining
389 * for any of the drives on this interface.
391 ide_port_for_each_dev(i, tdrive, hwif)
394 if (io_ports->ctl_addr == 0) {
395 spin_unlock_irqrestore(&hwif->lock, flags);
396 ide_complete_drive_reset(drive, BLK_STS_IOERR);
401 * Note that we also set nIEN while resetting the device,
402 * to mask unwanted interrupts from the interface during the reset.
403 * However, due to the design of PC hardware, this will cause an
404 * immediate interrupt due to the edge transition it produces.
405 * This single interrupt gives us a "fast poll" for drives that
406 * recover from reset very quickly, saving us the first 50ms wait time.
408 /* set SRST and nIEN */
409 tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS);
410 /* more than enough time */
412 /* clear SRST, leave nIEN (unless device is on the quirk list) */
413 tp_ops->write_devctl(hwif,
414 ((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) |
416 /* more than enough time */
418 hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
420 __ide_set_handler(drive, &reset_pollfunc, HZ/20);
423 * Some weird controller like resetting themselves to a strange
424 * state when the disks are reset this way. At least, the Winbond
425 * 553 documentation says that
427 port_ops = hwif->port_ops;
428 if (port_ops && port_ops->resetproc)
429 port_ops->resetproc(drive);
431 spin_unlock_irqrestore(&hwif->lock, flags);
436 * ide_do_reset() is the entry point to the drive/interface reset code.
439 ide_startstop_t ide_do_reset(ide_drive_t *drive)
441 return do_reset1(drive, 0);
443 EXPORT_SYMBOL(ide_do_reset);