cregit-Linux how code gets into the kernel

Release 4.14 drivers/ide/ide-park.c

Directory: drivers/ide
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/ide.h>
#include <linux/jiffies.h>
#include <linux/blkdev.h>


DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);


static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout) { ide_hwif_t *hwif = drive->hwif; struct request_queue *q = drive->queue; struct request *rq; int rc; timeout += jiffies; spin_lock_irq(&hwif->lock); if (drive->dev_flags & IDE_DFLAG_PARKED) { int reset_timer = time_before(timeout, drive->sleep); int start_queue = 0; drive->sleep = timeout; wake_up_all(&ide_park_wq); if (reset_timer && del_timer(&hwif->timer)) start_queue = 1; spin_unlock_irq(&hwif->lock); if (start_queue) blk_run_queue(q); return; } spin_unlock_irq(&hwif->lock); rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM); scsi_req(rq)->cmd[0] = REQ_PARK_HEADS; scsi_req(rq)->cmd_len = 1; ide_req(rq)->type = ATA_PRIV_MISC; rq->special = &timeout; blk_execute_rq(q, NULL, rq, 1); rc = scsi_req(rq)->result ? -EIO : 0; blk_put_request(rq); if (rc) goto out; /* * Make sure that *some* command is sent to the drive after the * timeout has expired, so power management will be reenabled. */ rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT); if (IS_ERR(rq)) goto out; scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS; scsi_req(rq)->cmd_len = 1; ide_req(rq)->type = ATA_PRIV_MISC; elv_add_request(q, rq, ELEVATOR_INSERT_FRONT); out: return; }

Contributors

PersonTokensPropCommitsCommitProp
Elias Oltmanns19669.75%17.69%
Christoph Hellwig4616.37%538.46%
Bartlomiej Zolnierkiewicz3612.81%430.77%
Joe Lawrence10.36%17.69%
Tejun Heo10.36%17.69%
Mel Gorman10.36%17.69%
Total281100.00%13100.00%


ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq) { struct ide_cmd cmd; struct ide_taskfile *tf = &cmd.tf; memset(&cmd, 0, sizeof(cmd)); if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) { drive->sleep = *(unsigned long *)rq->special; drive->dev_flags |= IDE_DFLAG_SLEEPING; tf->command = ATA_CMD_IDLEIMMEDIATE; tf->feature = 0x44; tf->lbal = 0x4c; tf->lbam = 0x4e; tf->lbah = 0x55; cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; } else /* cmd == REQ_UNPARK_HEADS */ tf->command = ATA_CMD_CHK_POWER; cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; cmd.protocol = ATA_PROT_NODATA; cmd.rq = rq; return do_rw_taskfile(drive, &cmd); }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz14486.75%466.67%
Sergei Shtylyov1911.45%116.67%
Christoph Hellwig31.81%116.67%
Total166100.00%6100.00%


ssize_t ide_park_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); ide_hwif_t *hwif = drive->hwif; unsigned long now; unsigned int msecs; if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) return -EOPNOTSUPP; spin_lock_irq(&hwif->lock); now = jiffies; if (drive->dev_flags & IDE_DFLAG_PARKED && time_after(drive->sleep, now)) msecs = jiffies_to_msecs(drive->sleep - now); else msecs = 0; spin_unlock_irq(&hwif->lock); return snprintf(buf, 20, "%u\n", msecs); }

Contributors

PersonTokensPropCommitsCommitProp
Elias Oltmanns10788.43%133.33%
Bartlomiej Zolnierkiewicz1411.57%266.67%
Total121100.00%3100.00%


ssize_t ide_park_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { #define MAX_PARK_TIMEOUT 30000 ide_drive_t *drive = to_ide_device(dev); long int input; int rc; rc = kstrtol(buf, 10, &input); if (rc) return rc; if (input < -2) return -EINVAL; if (input > MAX_PARK_TIMEOUT) { input = MAX_PARK_TIMEOUT; rc = -EOVERFLOW; } mutex_lock(&ide_setting_mtx); if (input >= 0) { if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) rc = -EOPNOTSUPP; else if (input || drive->dev_flags & IDE_DFLAG_PARKED) issue_park_cmd(drive, msecs_to_jiffies(input)); } else { if (drive->media == ide_disk) switch (input) { case -1: drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD; break; case -2: drive->dev_flags |= IDE_DFLAG_NO_UNLOAD; break; } else rc = -EOPNOTSUPP; } mutex_unlock(&ide_setting_mtx); return rc ? rc : len; }

Contributors

PersonTokensPropCommitsCommitProp
Elias Oltmanns19096.45%150.00%
Jingoo Han73.55%150.00%
Total197100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Elias Oltmanns51064.89%14.76%
Bartlomiej Zolnierkiewicz19424.68%838.10%
Christoph Hellwig496.23%523.81%
Sergei Shtylyov192.42%14.76%
Jingoo Han70.89%14.76%
Tejun Heo40.51%29.52%
Greg Kroah-Hartman10.13%14.76%
Joe Lawrence10.13%14.76%
Mel Gorman10.13%14.76%
Total786100.00%21100.00%
Directory: drivers/ide
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