linux/drivers/ide/ide.c
Elias Oltmanns 79e36a9f54 IDE: Fix HDIO_DRIVE_RESET handling
Currently, the code path executing an HDIO_DRIVE_RESET ioctl is broken
in various ways.  Most importantly, it is treated as an out of band
request in an illegal way which may very likely lead to system lock ups.
Use the drive's request queue to avoid this problem (and fix a locking
issue for free along the way).

Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
Cc: "Randy Dunlap" <randy.dunlap@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-07-16 20:33:48 +02:00

1008 lines
24 KiB
C

/*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyrifht (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
*/
/*
* Mostly written by Mark Lord <mlord@pobox.com>
* and Gadi Oxman <gadio@netvision.net.il>
* and Andre Hedrick <andre@linux-ide.org>
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This is the multiple IDE interface driver, as evolved from hd.c.
* It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
* (usually 14 & 15).
* There can be up to two drives per interface, as per the ATA-2 spec.
*
* ...
*
* From hd.c:
* |
* | It traverses the request-list, using interrupts to jump between functions.
* | As nearly all functions can be called within interrupts, we may not sleep.
* | Special care is recommended. Have Fun!
* |
* | modified by Drew Eckhardt to check nr of hd's from the CMOS.
* |
* | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
* | in the early extended-partition checks and added DM partitions.
* |
* | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
* |
* | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
* | and general streamlining by Mark Lord (mlord@pobox.com).
*
* October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
*
* Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
* Delman Lee (delman@ieee.org) ("Mr. atdisk2")
* Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
*
* This was a rewrite of just about everything from hd.c, though some original
* code is still sprinkled about. Think of it as a major evolution, with
* inspiration from lots of linux users, esp. hamish@zot.apana.org.au
*/
#define _IDE_C /* Tell ide.h it's really us */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/device.h>
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
struct class *ide_port_class;
static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
IDE2_MAJOR, IDE3_MAJOR,
IDE4_MAJOR, IDE5_MAJOR,
IDE6_MAJOR, IDE7_MAJOR,
IDE8_MAJOR, IDE9_MAJOR };
DEFINE_MUTEX(ide_cfg_mtx);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
EXPORT_SYMBOL(ide_lock);
static void ide_port_init_devices_data(ide_hwif_t *);
/*
* Do not even *think* about calling this!
*/
void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
{
/* bulk initialize hwif & drive info with zeros */
memset(hwif, 0, sizeof(ide_hwif_t));
/* fill in any non-zero initial values */
hwif->index = index;
hwif->major = ide_hwif_to_major[index];
hwif->name[0] = 'i';
hwif->name[1] = 'd';
hwif->name[2] = 'e';
hwif->name[3] = '0' + index;
hwif->bus_state = BUSSTATE_ON;
init_completion(&hwif->gendev_rel_comp);
default_hwif_iops(hwif);
default_hwif_transport(hwif);
ide_port_init_devices_data(hwif);
}
static void ide_port_init_devices_data(ide_hwif_t *hwif)
{
int unit;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
u8 j = (hwif->index * MAX_DRIVES) + unit;
memset(drive, 0, sizeof(*drive));
drive->media = ide_disk;
drive->select.all = (unit<<4)|0xa0;
drive->hwif = hwif;
drive->ready_stat = READY_STAT;
drive->bad_wstat = BAD_W_STAT;
drive->special.b.recalibrate = 1;
drive->special.b.set_geometry = 1;
drive->name[0] = 'h';
drive->name[1] = 'd';
drive->name[2] = 'a' + j;
drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
INIT_LIST_HEAD(&drive->list);
init_completion(&drive->gendev_rel_comp);
}
}
void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
{
ide_hwgroup_t *hwgroup = hwif->hwgroup;
spin_lock_irq(&ide_lock);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
if (hwif->next == hwif) {
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
/* There is another interface in hwgroup.
* Unlink us, and set hwgroup->drive and ->hwif to
* something sane.
*/
ide_hwif_t *g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Chose a random hwif for hwgroup->hwif.
* It's guaranteed that there are no drives
* left in the hwgroup.
*/
BUG_ON(hwgroup->drive != NULL);
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
spin_unlock_irq(&ide_lock);
}
/* Called with ide_lock held. */
static void __ide_port_unregister_devices(ide_hwif_t *hwif)
{
int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive = &hwif->drives[i];
if (drive->present) {
spin_unlock_irq(&ide_lock);
device_unregister(&drive->gendev);
wait_for_completion(&drive->gendev_rel_comp);
spin_lock_irq(&ide_lock);
}
}
}
void ide_port_unregister_devices(ide_hwif_t *hwif)
{
mutex_lock(&ide_cfg_mtx);
spin_lock_irq(&ide_lock);
__ide_port_unregister_devices(hwif);
hwif->present = 0;
ide_port_init_devices_data(hwif);
spin_unlock_irq(&ide_lock);
mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
/**
* ide_unregister - free an IDE interface
* @hwif: IDE interface
*
* Perform the final unregister of an IDE interface. At the moment
* we don't refcount interfaces so this will also get split up.
*
* Locking:
* The caller must not hold the IDE locks
* The drive present/vanishing is not yet properly locked
* Take care with the callbacks. These have been split to avoid
* deadlocking the IDE layer. The shutdown callback is called
* before we take the lock and free resources. It is up to the
* caller to be sure there is no pending I/O here, and that
* the interface will not be reopened (present/vanishing locking
* isn't yet done BTW). After we commit to the final kill we
* call the cleanup callback with the ide locks held.
*
* Unregister restores the hwif structures to the default state.
* This is raving bonkers.
*/
void ide_unregister(ide_hwif_t *hwif)
{
ide_hwif_t *g;
ide_hwgroup_t *hwgroup;
int irq_count = 0;
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
mutex_lock(&ide_cfg_mtx);
spin_lock_irq(&ide_lock);
if (hwif->present) {
__ide_port_unregister_devices(hwif);
hwif->present = 0;
}
spin_unlock_irq(&ide_lock);
ide_proc_unregister_port(hwif);
hwgroup = hwif->hwgroup;
/*
* free the irq if we were the only hwif using it
*/
g = hwgroup->hwif;
do {
if (g->irq == hwif->irq)
++irq_count;
g = g->next;
} while (g != hwgroup->hwif);
if (irq_count == 1)
free_irq(hwif->irq, hwgroup);
ide_remove_port_from_hwgroup(hwif);
device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);
/*
* Remove us from the kernel's knowledge
*/
blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
kfree(hwif->sg_table);
unregister_blkdev(hwif->major, hwif->name);
if (hwif->dma_base)
ide_release_dma_engine(hwif);
spin_lock_irq(&ide_lock);
/* restore hwif data to pristine status */
ide_init_port_data(hwif, hwif->index);
spin_unlock_irq(&ide_lock);
mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL(ide_unregister);
void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
{
memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
hwif->irq = hw->irq;
hwif->chipset = hw->chipset;
hwif->dev = hw->dev;
hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
hwif->ack_intr = hw->ack_intr;
}
EXPORT_SYMBOL_GPL(ide_init_port_hw);
/*
* Locks for IDE setting functionality
*/
DEFINE_MUTEX(ide_setting_mtx);
EXPORT_SYMBOL_GPL(ide_setting_mtx);
/**
* ide_spin_wait_hwgroup - wait for group
* @drive: drive in the group
*
* Wait for an IDE device group to go non busy and then return
* holding the ide_lock which guards the hwgroup->busy status
* and right to use it.
*/
int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
unsigned long timeout = jiffies + (3 * HZ);
spin_lock_irq(&ide_lock);
while (hwgroup->busy) {
unsigned long lflags;
spin_unlock_irq(&ide_lock);
local_irq_set(lflags);
if (time_after(jiffies, timeout)) {
local_irq_restore(lflags);
printk(KERN_ERR "%s: channel busy\n", drive->name);
return -EBUSY;
}
local_irq_restore(lflags);
spin_lock_irq(&ide_lock);
}
return 0;
}
EXPORT_SYMBOL(ide_spin_wait_hwgroup);
int set_io_32bit(ide_drive_t *drive, int arg)
{
if (drive->no_io_32bit)
return -EPERM;
if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->io_32bit = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
static int set_ksettings(ide_drive_t *drive, int arg)
{
if (arg < 0 || arg > 1)
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->keep_settings = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
int set_using_dma(ide_drive_t *drive, int arg)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
ide_hwif_t *hwif = drive->hwif;
int err = -EPERM;
if (arg < 0 || arg > 1)
return -EINVAL;
if (!drive->id || !(drive->id->capability & 1))
goto out;
if (hwif->dma_ops == NULL)
goto out;
err = -EBUSY;
if (ide_spin_wait_hwgroup(drive))
goto out;
/*
* set ->busy flag, unlock and let it ride
*/
hwif->hwgroup->busy = 1;
spin_unlock_irq(&ide_lock);
err = 0;
if (arg) {
if (ide_set_dma(drive))
err = -EIO;
} else
ide_dma_off(drive);
/*
* lock, clear ->busy flag and unlock before leaving
*/
spin_lock_irq(&ide_lock);
hwif->hwgroup->busy = 0;
spin_unlock_irq(&ide_lock);
out:
return err;
#else
if (arg < 0 || arg > 1)
return -EINVAL;
return -EPERM;
#endif
}
int set_pio_mode(ide_drive_t *drive, int arg)
{
struct request *rq;
ide_hwif_t *hwif = drive->hwif;
const struct ide_port_ops *port_ops = hwif->port_ops;
if (arg < 0 || arg > 255)
return -EINVAL;
if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
return -ENOSYS;
if (drive->special.b.set_tune)
return -EBUSY;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
drive->tune_req = (u8) arg;
drive->special.b.set_tune = 1;
blk_execute_rq(drive->queue, NULL, rq, 0);
blk_put_request(rq);
return 0;
}
static int set_unmaskirq(ide_drive_t *drive, int arg)
{
if (drive->no_unmask)
return -EPERM;
if (arg < 0 || arg > 1)
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->unmask = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
{
ide_drive_t *drive = dev->driver_data;
ide_hwif_t *hwif = HWIF(drive);
struct request *rq;
struct request_pm_state rqpm;
ide_task_t args;
int ret;
/* Call ACPI _GTM only once */
if (!(drive->dn % 2))
ide_acpi_get_timing(hwif);
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_SUSPEND;
rq->special = &args;
rq->data = &rqpm;
rqpm.pm_step = ide_pm_state_start_suspend;
if (mesg.event == PM_EVENT_PRETHAW)
mesg.event = PM_EVENT_FREEZE;
rqpm.pm_state = mesg.event;
ret = blk_execute_rq(drive->queue, NULL, rq, 0);
blk_put_request(rq);
/* only call ACPI _PS3 after both drivers are suspended */
if (!ret && (((drive->dn % 2) && hwif->drives[0].present
&& hwif->drives[1].present)
|| !hwif->drives[0].present
|| !hwif->drives[1].present))
ide_acpi_set_state(hwif, 0);
return ret;
}
static int generic_ide_resume(struct device *dev)
{
ide_drive_t *drive = dev->driver_data;
ide_hwif_t *hwif = HWIF(drive);
struct request *rq;
struct request_pm_state rqpm;
ide_task_t args;
int err;
/* Call ACPI _STM only once */
if (!(drive->dn % 2)) {
ide_acpi_set_state(hwif, 1);
ide_acpi_push_timing(hwif);
}
ide_acpi_exec_tfs(drive);
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_RESUME;
rq->cmd_flags |= REQ_PREEMPT;
rq->special = &args;
rq->data = &rqpm;
rqpm.pm_step = ide_pm_state_start_resume;
rqpm.pm_state = PM_EVENT_ON;
err = blk_execute_rq(drive->queue, NULL, rq, 1);
blk_put_request(rq);
if (err == 0 && dev->driver) {
ide_driver_t *drv = to_ide_driver(dev->driver);
if (drv->resume)
drv->resume(drive);
}
return err;
}
static void generic_drive_reset(ide_drive_t *drive)
{
struct request *rq;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_len = 1;
rq->cmd[0] = REQ_DRIVE_RESET;
rq->cmd_flags |= REQ_SOFTBARRIER;
blk_execute_rq(drive->queue, NULL, rq, 1);
blk_put_request(rq);
}
int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
unsigned int cmd, unsigned long arg)
{
unsigned long flags;
ide_driver_t *drv;
void __user *p = (void __user *)arg;
int err = 0, (*setfunc)(ide_drive_t *, int);
u8 *val;
switch (cmd) {
case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val;
case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val;
case HDIO_GET_DMA: val = &drive->using_dma; goto read_val;
case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val;
case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val;
case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val;
case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val;
case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val;
}
switch (cmd) {
case HDIO_OBSOLETE_IDENTITY:
case HDIO_GET_IDENTITY:
if (bdev != bdev->bd_contains)
return -EINVAL;
if (drive->id_read == 0)
return -ENOMSG;
if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
return -EFAULT;
return 0;
case HDIO_GET_NICE:
return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP |
drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP |
drive->nice1 << IDE_NICE_1,
(long __user *) arg);
#ifdef CONFIG_IDE_TASK_IOCTL
case HDIO_DRIVE_TASKFILE:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
switch(drive->media) {
case ide_disk:
return ide_taskfile_ioctl(drive, cmd, arg);
default:
return -ENOMSG;
}
#endif /* CONFIG_IDE_TASK_IOCTL */
case HDIO_DRIVE_CMD:
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
return ide_cmd_ioctl(drive, cmd, arg);
case HDIO_DRIVE_TASK:
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
return ide_task_ioctl(drive, cmd, arg);
case HDIO_SET_NICE:
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
return -EPERM;
drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
drv = *(ide_driver_t **)bdev->bd_disk->private_data;
if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
drive->dsc_overlap = 0;
return -EPERM;
}
drive->nice1 = (arg >> IDE_NICE_1) & 1;
return 0;
case HDIO_DRIVE_RESET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
generic_drive_reset(drive);
return 0;
case HDIO_GET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
return -EFAULT;
return 0;
case HDIO_SET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return -EOPNOTSUPP;
default:
return -EINVAL;
}
read_val:
mutex_lock(&ide_setting_mtx);
spin_lock_irqsave(&ide_lock, flags);
err = *val;
spin_unlock_irqrestore(&ide_lock, flags);
mutex_unlock(&ide_setting_mtx);
return err >= 0 ? put_user(err, (long __user *)arg) : err;
set_val:
if (bdev != bdev->bd_contains)
err = -EINVAL;
else {
if (!capable(CAP_SYS_ADMIN))
err = -EACCES;
else {
mutex_lock(&ide_setting_mtx);
err = setfunc(drive, arg);
mutex_unlock(&ide_setting_mtx);
}
}
return err;
}
EXPORT_SYMBOL(generic_ide_ioctl);
static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static char *media_string(ide_drive_t *drive)
{
switch (drive->media) {
case ide_disk:
return "disk";
case ide_cdrom:
return "cdrom";
case ide_tape:
return "tape";
case ide_floppy:
return "floppy";
case ide_optical:
return "optical";
default:
return "UNKNOWN";
}
}
static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", media_string(drive));
}
static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->name);
}
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "ide:m-%s\n", media_string(drive));
}
static ssize_t model_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->model);
}
static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->fw_rev);
}
static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->serial_no);
}
static struct device_attribute ide_dev_attrs[] = {
__ATTR_RO(media),
__ATTR_RO(drivename),
__ATTR_RO(modalias),
__ATTR_RO(model),
__ATTR_RO(firmware),
__ATTR(serial, 0400, serial_show, NULL),
__ATTR_NULL
};
static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
{
ide_drive_t *drive = to_ide_device(dev);
add_uevent_var(env, "MEDIA=%s", media_string(drive));
add_uevent_var(env, "DRIVENAME=%s", drive->name);
add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
return 0;
}
static int generic_ide_probe(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
ide_driver_t *drv = to_ide_driver(dev->driver);
return drv->probe ? drv->probe(drive) : -ENODEV;
}
static int generic_ide_remove(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
ide_driver_t *drv = to_ide_driver(dev->driver);
if (drv->remove)
drv->remove(drive);
return 0;
}
static void generic_ide_shutdown(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
ide_driver_t *drv = to_ide_driver(dev->driver);
if (dev->driver && drv->shutdown)
drv->shutdown(drive);
}
struct bus_type ide_bus_type = {
.name = "ide",
.match = ide_bus_match,
.uevent = ide_uevent,
.probe = generic_ide_probe,
.remove = generic_ide_remove,
.shutdown = generic_ide_shutdown,
.dev_attrs = ide_dev_attrs,
.suspend = generic_ide_suspend,
.resume = generic_ide_resume,
};
EXPORT_SYMBOL_GPL(ide_bus_type);
int ide_vlb_clk;
EXPORT_SYMBOL_GPL(ide_vlb_clk);
module_param_named(vlb_clock, ide_vlb_clk, int, 0);
MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
int ide_pci_clk;
EXPORT_SYMBOL_GPL(ide_pci_clk);
module_param_named(pci_clock, ide_pci_clk, int, 0);
MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
{
int a, b, i, j = 1;
unsigned int *dev_param_mask = (unsigned int *)kp->arg;
if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
sscanf(s, "%d.%d", &a, &b) != 2)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (j)
*dev_param_mask |= (1 << i);
else
*dev_param_mask &= (1 << i);
return 0;
}
static unsigned int ide_nodma;
module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");
static unsigned int ide_noflush;
module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");
static unsigned int ide_noprobe;
module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");
static unsigned int ide_nowerr;
module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
static unsigned int ide_cdroms;
module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
struct chs_geom {
unsigned int cyl;
u8 head;
u8 sect;
};
static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
{
int a, b, c = 0, h = 0, s = 0, i, j = 1;
if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (c > INT_MAX || h > 255 || s > 255)
return -EINVAL;
if (j)
ide_disks |= (1 << i);
else
ide_disks &= (1 << i);
ide_disks_chs[i].cyl = c;
ide_disks_chs[i].head = h;
ide_disks_chs[i].sect = s;
return 0;
}
module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
static void ide_dev_apply_params(ide_drive_t *drive)
{
int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
if (ide_nodma & (1 << i)) {
printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
drive->nodma = 1;
}
if (ide_noflush & (1 << i)) {
printk(KERN_INFO "ide: disabling flush requests for %s\n",
drive->name);
drive->noflush = 1;
}
if (ide_noprobe & (1 << i)) {
printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
drive->noprobe = 1;
}
if (ide_nowerr & (1 << i)) {
printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
drive->name);
drive->bad_wstat = BAD_R_STAT;
}
if (ide_cdroms & (1 << i)) {
printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
drive->present = 1;
drive->media = ide_cdrom;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
}
if (ide_disks & (1 << i)) {
drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
drive->head = drive->bios_head = ide_disks_chs[i].head;
drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
drive->forced_geom = 1;
printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
drive->name,
drive->cyl, drive->head, drive->sect);
drive->present = 1;
drive->media = ide_disk;
drive->ready_stat = READY_STAT;
}
}
static unsigned int ide_ignore_cable;
static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
int i, j = 1;
if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
return -EINVAL;
if (i >= MAX_HWIFS || j < 0 || j > 1)
return -EINVAL;
if (j)
ide_ignore_cable |= (1 << i);
else
ide_ignore_cable &= (1 << i);
return 0;
}
module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
void ide_port_apply_params(ide_hwif_t *hwif)
{
int i;
if (ide_ignore_cable & (1 << hwif->index)) {
printk(KERN_INFO "ide: ignoring cable detection for %s\n",
hwif->name);
hwif->cbl = ATA_CBL_PATA40_SHORT;
}
for (i = 0; i < MAX_DRIVES; i++)
ide_dev_apply_params(&hwif->drives[i]);
}
/*
* This is gets invoked once during initialization, to set *everything* up
*/
static int __init ide_init(void)
{
int ret;
printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
ret = bus_register(&ide_bus_type);
if (ret < 0) {
printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
return ret;
}
ide_port_class = class_create(THIS_MODULE, "ide_port");
if (IS_ERR(ide_port_class)) {
ret = PTR_ERR(ide_port_class);
goto out_port_class;
}
proc_ide_create();
return 0;
out_port_class:
bus_unregister(&ide_bus_type);
return ret;
}
static void __exit ide_exit(void)
{
proc_ide_destroy();
class_destroy(ide_port_class);
bus_unregister(&ide_bus_type);
}
module_init(ide_init);
module_exit(ide_exit);
MODULE_LICENSE("GPL");