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linuxdebug/drivers/block/paride/pd.c

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null pointer error
2024-07-16 15:50:57 +02:00
/*
pd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
This is the high-level driver for parallel port IDE hard
drives based on chips supported by the paride module.
By default, the driver will autoprobe for a single parallel
port IDE drive, but if their individual parameters are
specified, the driver can handle up to 4 drives.
The behaviour of the pd driver can be altered by setting
some parameters from the insmod command line. The following
parameters are adjustable:
drive0 These four arguments can be arrays of
drive1 1-8 integers as follows:
drive2
drive3 <prt>,<pro>,<uni>,<mod>,<geo>,<sby>,<dly>,<slv>
Where,
<prt> is the base of the parallel port address for
the corresponding drive. (required)
<pro> is the protocol number for the adapter that
supports this drive. These numbers are
logged by 'paride' when the protocol modules
are initialised. (0 if not given)
<uni> for those adapters that support chained
devices, this is the unit selector for the
chain of devices on the given port. It should
be zero for devices that don't support chaining.
(0 if not given)
<mod> this can be -1 to choose the best mode, or one
of the mode numbers supported by the adapter.
(-1 if not given)
<geo> this defaults to 0 to indicate that the driver
should use the CHS geometry provided by the drive
itself. If set to 1, the driver will provide
a logical geometry with 64 heads and 32 sectors
per track, to be consistent with most SCSI
drivers. (0 if not given)
<sby> set this to zero to disable the power saving
standby mode, if needed. (1 if not given)
<dly> some parallel ports require the driver to
go more slowly. -1 sets a default value that
should work with the chosen protocol. Otherwise,
set this to a small integer, the larger it is
the slower the port i/o. In some cases, setting
this to zero will speed up the device. (default -1)
<slv> IDE disks can be jumpered to master or slave.
Set this to 0 to choose the master drive, 1 to
choose the slave, -1 (the default) to choose the
first drive found.
major You may use this parameter to override the
default major number (45) that this driver
will use. Be sure to change the device
name as well.
name This parameter is a character string that
contains the name the kernel will use for this
device (in /proc output, for instance).
(default "pd")
cluster The driver will attempt to aggregate requests
for adjacent blocks into larger multi-block
clusters. The maximum cluster size (in 512
byte sectors) is set with this parameter.
(default 64)
verbose This parameter controls the amount of logging
that the driver will do. Set it to 0 for
normal operation, 1 to see autoprobe progress
messages, or 2 to see additional debugging
output. (default 0)
nice This parameter controls the driver's use of
idle CPU time, at the expense of some speed.
If this driver is built into the kernel, you can use kernel
the following command line parameters, with the same values
as the corresponding module parameters listed above:
pd.drive0
pd.drive1
pd.drive2
pd.drive3
pd.cluster
pd.nice
In addition, you can use the parameter pd.disable to disable
the driver entirely.
*/
/* Changes:
1.01 GRG 1997.01.24 Restored pd_reset()
Added eject ioctl
1.02 GRG 1998.05.06 SMP spinlock changes,
Added slave support
1.03 GRG 1998.06.16 Eliminate an Ugh.
1.04 GRG 1998.08.15 Extra debugging, use HZ in loop timing
1.05 GRG 1998.09.24 Added jumbo support
*/
#define PD_VERSION "1.05"
#define PD_MAJOR 45
#define PD_NAME "pd"
#define PD_UNITS 4
/* Here are things one can override from the insmod command.
Most are autoprobed by paride unless set here. Verbose is off
by default.
*/
#include <linux/types.h>
static int verbose = 0;
static int major = PD_MAJOR;
static char *name = PD_NAME;
static int cluster = 64;
static int nice = 0;
static int disable = 0;
static int drive0[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
static int drive1[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
static int drive2[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
static int drive3[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
static int (*drives[4])[8] = {&drive0, &drive1, &drive2, &drive3};
enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
/* end of parameters */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/cdrom.h> /* for the eject ioctl */
#include <linux/blk-mq.h>
#include <linux/blkpg.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
static DEFINE_MUTEX(pd_mutex);
static DEFINE_SPINLOCK(pd_lock);
module_param(verbose, int, 0);
module_param(major, int, 0);
module_param(name, charp, 0);
module_param(cluster, int, 0);
module_param(nice, int, 0);
module_param_array(drive0, int, NULL, 0);
module_param_array(drive1, int, NULL, 0);
module_param_array(drive2, int, NULL, 0);
module_param_array(drive3, int, NULL, 0);
#include "paride.h"
#define PD_BITS 4
/* numbers for "SCSI" geometry */
#define PD_LOG_HEADS 64
#define PD_LOG_SECTS 32
#define PD_ID_OFF 54
#define PD_ID_LEN 14
#define PD_MAX_RETRIES 5
#define PD_TMO 800 /* interrupt timeout in jiffies */
#define PD_SPIN_DEL 50 /* spin delay in micro-seconds */
#define PD_SPIN (1000000*PD_TMO)/(HZ*PD_SPIN_DEL)
#define STAT_ERR 0x00001
#define STAT_INDEX 0x00002
#define STAT_ECC 0x00004
#define STAT_DRQ 0x00008
#define STAT_SEEK 0x00010
#define STAT_WRERR 0x00020
#define STAT_READY 0x00040
#define STAT_BUSY 0x00080
#define ERR_AMNF 0x00100
#define ERR_TK0NF 0x00200
#define ERR_ABRT 0x00400
#define ERR_MCR 0x00800
#define ERR_IDNF 0x01000
#define ERR_MC 0x02000
#define ERR_UNC 0x04000
#define ERR_TMO 0x10000
#define IDE_READ 0x20
#define IDE_WRITE 0x30
#define IDE_READ_VRFY 0x40
#define IDE_INIT_DEV_PARMS 0x91
#define IDE_STANDBY 0x96
#define IDE_ACKCHANGE 0xdb
#define IDE_DOORLOCK 0xde
#define IDE_DOORUNLOCK 0xdf
#define IDE_IDENTIFY 0xec
#define IDE_EJECT 0xed
#define PD_NAMELEN 8
struct pd_unit {
struct pi_adapter pia; /* interface to paride layer */
struct pi_adapter *pi;
int access; /* count of active opens ... */
int capacity; /* Size of this volume in sectors */
int heads; /* physical geometry */
int sectors;
int cylinders;
int can_lba;
int drive; /* master=0 slave=1 */
int changed; /* Have we seen a disk change ? */
int removable; /* removable media device ? */
int standby;
int alt_geom;
char name[PD_NAMELEN]; /* pda, pdb, etc ... */
struct gendisk *gd;
struct blk_mq_tag_set tag_set;
struct list_head rq_list;
};
static struct pd_unit pd[PD_UNITS];
struct pd_req {
/* for REQ_OP_DRV_IN: */
enum action (*func)(struct pd_unit *disk);
};
static char pd_scratch[512]; /* scratch block buffer */
static char *pd_errs[17] = { "ERR", "INDEX", "ECC", "DRQ", "SEEK", "WRERR",
"READY", "BUSY", "AMNF", "TK0NF", "ABRT", "MCR",
"IDNF", "MC", "UNC", "???", "TMO"
};
static void *par_drv; /* reference of parport driver */
static inline int status_reg(struct pd_unit *disk)
{
return pi_read_regr(disk->pi, 1, 6);
}
static inline int read_reg(struct pd_unit *disk, int reg)
{
return pi_read_regr(disk->pi, 0, reg);
}
static inline void write_status(struct pd_unit *disk, int val)
{
pi_write_regr(disk->pi, 1, 6, val);
}
static inline void write_reg(struct pd_unit *disk, int reg, int val)
{
pi_write_regr(disk->pi, 0, reg, val);
}
static inline u8 DRIVE(struct pd_unit *disk)
{
return 0xa0+0x10*disk->drive;
}
/* ide command interface */
static void pd_print_error(struct pd_unit *disk, char *msg, int status)
{
int i;
printk("%s: %s: status = 0x%x =", disk->name, msg, status);
for (i = 0; i < ARRAY_SIZE(pd_errs); i++)
if (status & (1 << i))
printk(" %s", pd_errs[i]);
printk("\n");
}
static void pd_reset(struct pd_unit *disk)
{ /* called only for MASTER drive */
write_status(disk, 4);
udelay(50);
write_status(disk, 0);
udelay(250);
}
#define DBMSG(msg) ((verbose>1)?(msg):NULL)
static int pd_wait_for(struct pd_unit *disk, int w, char *msg)
{ /* polled wait */
int k, r, e;
k = 0;
while (k < PD_SPIN) {
r = status_reg(disk);
k++;
if (((r & w) == w) && !(r & STAT_BUSY))
break;
udelay(PD_SPIN_DEL);
}
e = (read_reg(disk, 1) << 8) + read_reg(disk, 7);
if (k >= PD_SPIN)
e |= ERR_TMO;
if ((e & (STAT_ERR | ERR_TMO)) && (msg != NULL))
pd_print_error(disk, msg, e);
return e;
}
static void pd_send_command(struct pd_unit *disk, int n, int s, int h, int c0, int c1, int func)
{
write_reg(disk, 6, DRIVE(disk) + h);
write_reg(disk, 1, 0); /* the IDE task file */
write_reg(disk, 2, n);
write_reg(disk, 3, s);
write_reg(disk, 4, c0);
write_reg(disk, 5, c1);
write_reg(disk, 7, func);
udelay(1);
}
static void pd_ide_command(struct pd_unit *disk, int func, int block, int count)
{
int c1, c0, h, s;
if (disk->can_lba) {
s = block & 255;
c0 = (block >>= 8) & 255;
c1 = (block >>= 8) & 255;
h = ((block >>= 8) & 15) + 0x40;
} else {
s = (block % disk->sectors) + 1;
h = (block /= disk->sectors) % disk->heads;
c0 = (block /= disk->heads) % 256;
c1 = (block >>= 8);
}
pd_send_command(disk, count, s, h, c0, c1, func);
}
/* The i/o request engine */
enum action {Fail = 0, Ok = 1, Hold, Wait};
static struct request *pd_req; /* current request */
static enum action (*phase)(void);
static void run_fsm(void);
static void ps_tq_int(struct work_struct *work);
static DECLARE_DELAYED_WORK(fsm_tq, ps_tq_int);
static void schedule_fsm(void)
{
if (!nice)
schedule_delayed_work(&fsm_tq, 0);
else
schedule_delayed_work(&fsm_tq, nice-1);
}
static void ps_tq_int(struct work_struct *work)
{
run_fsm();
}
static enum action do_pd_io_start(void);
static enum action pd_special(void);
static enum action do_pd_read_start(void);
static enum action do_pd_write_start(void);
static enum action do_pd_read_drq(void);
static enum action do_pd_write_done(void);
static int pd_queue;
static int pd_claimed;
static struct pd_unit *pd_current; /* current request's drive */
static PIA *pi_current; /* current request's PIA */
static int set_next_request(void)
{
struct gendisk *disk;
struct request_queue *q;
int old_pos = pd_queue;
do {
disk = pd[pd_queue].gd;
q = disk ? disk->queue : NULL;
if (++pd_queue == PD_UNITS)
pd_queue = 0;
if (q) {
struct pd_unit *disk = q->queuedata;
if (list_empty(&disk->rq_list))
continue;
pd_req = list_first_entry(&disk->rq_list,
struct request,
queuelist);
list_del_init(&pd_req->queuelist);
blk_mq_start_request(pd_req);
break;
}
} while (pd_queue != old_pos);
return pd_req != NULL;
}
static void run_fsm(void)
{
while (1) {
enum action res;
int stop = 0;
if (!phase) {
pd_current = pd_req->q->disk->private_data;
pi_current = pd_current->pi;
phase = do_pd_io_start;
}
switch (pd_claimed) {
case 0:
pd_claimed = 1;
if (!pi_schedule_claimed(pi_current, run_fsm))
return;
fallthrough;
case 1:
pd_claimed = 2;
pi_current->proto->connect(pi_current);
}
switch(res = phase()) {
case Ok: case Fail: {
blk_status_t err;
err = res == Ok ? 0 : BLK_STS_IOERR;
pi_disconnect(pi_current);
pd_claimed = 0;
phase = NULL;
spin_lock_irq(&pd_lock);
if (!blk_update_request(pd_req, err,
blk_rq_cur_bytes(pd_req))) {
__blk_mq_end_request(pd_req, err);
pd_req = NULL;
stop = !set_next_request();
}
spin_unlock_irq(&pd_lock);
if (stop)
return;
}
fallthrough;
case Hold:
schedule_fsm();
return;
case Wait:
pi_disconnect(pi_current);
pd_claimed = 0;
}
}
}
static int pd_retries = 0; /* i/o error retry count */
static int pd_block; /* address of next requested block */
static int pd_count; /* number of blocks still to do */
static int pd_run; /* sectors in current cluster */
static char *pd_buf; /* buffer for request in progress */
static enum action do_pd_io_start(void)
{
switch (req_op(pd_req)) {
case REQ_OP_DRV_IN:
phase = pd_special;
return pd_special();
case REQ_OP_READ:
case REQ_OP_WRITE:
pd_block = blk_rq_pos(pd_req);
pd_count = blk_rq_cur_sectors(pd_req);
if (pd_block + pd_count > get_capacity(pd_req->q->disk))
return Fail;
pd_run = blk_rq_sectors(pd_req);
pd_buf = bio_data(pd_req->bio);
pd_retries = 0;
if (req_op(pd_req) == REQ_OP_READ)
return do_pd_read_start();
else
return do_pd_write_start();
default:
break;
}
return Fail;
}
static enum action pd_special(void)
{
struct pd_req *req = blk_mq_rq_to_pdu(pd_req);
return req->func(pd_current);
}
static int pd_next_buf(void)
{
unsigned long saved_flags;
pd_count--;
pd_run--;
pd_buf += 512;
pd_block++;
if (!pd_run)
return 1;
if (pd_count)
return 0;
spin_lock_irqsave(&pd_lock, saved_flags);
if (!blk_update_request(pd_req, 0, blk_rq_cur_bytes(pd_req))) {
__blk_mq_end_request(pd_req, 0);
pd_req = NULL;
pd_count = 0;
pd_buf = NULL;
} else {
pd_count = blk_rq_cur_sectors(pd_req);
pd_buf = bio_data(pd_req->bio);
}
spin_unlock_irqrestore(&pd_lock, saved_flags);
return !pd_count;
}
static unsigned long pd_timeout;
static enum action do_pd_read_start(void)
{
if (pd_wait_for(pd_current, STAT_READY, "do_pd_read") & STAT_ERR) {
if (pd_retries < PD_MAX_RETRIES) {
pd_retries++;
return Wait;
}
return Fail;
}
pd_ide_command(pd_current, IDE_READ, pd_block, pd_run);
phase = do_pd_read_drq;
pd_timeout = jiffies + PD_TMO;
return Hold;
}
static enum action do_pd_write_start(void)
{
if (pd_wait_for(pd_current, STAT_READY, "do_pd_write") & STAT_ERR) {
if (pd_retries < PD_MAX_RETRIES) {
pd_retries++;
return Wait;
}
return Fail;
}
pd_ide_command(pd_current, IDE_WRITE, pd_block, pd_run);
while (1) {
if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_write_drq") & STAT_ERR) {
if (pd_retries < PD_MAX_RETRIES) {
pd_retries++;
return Wait;
}
return Fail;
}
pi_write_block(pd_current->pi, pd_buf, 512);
if (pd_next_buf())
break;
}
phase = do_pd_write_done;
pd_timeout = jiffies + PD_TMO;
return Hold;
}
static inline int pd_ready(void)
{
return !(status_reg(pd_current) & STAT_BUSY);
}
static enum action do_pd_read_drq(void)
{
if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
return Hold;
while (1) {
if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_read_drq") & STAT_ERR) {
if (pd_retries < PD_MAX_RETRIES) {
pd_retries++;
phase = do_pd_read_start;
return Wait;
}
return Fail;
}
pi_read_block(pd_current->pi, pd_buf, 512);
if (pd_next_buf())
break;
}
return Ok;
}
static enum action do_pd_write_done(void)
{
if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
return Hold;
if (pd_wait_for(pd_current, STAT_READY, "do_pd_write_done") & STAT_ERR) {
if (pd_retries < PD_MAX_RETRIES) {
pd_retries++;
phase = do_pd_write_start;
return Wait;
}
return Fail;
}
return Ok;
}
/* special io requests */
/* According to the ATA standard, the default CHS geometry should be
available following a reset. Some Western Digital drives come up
in a mode where only LBA addresses are accepted until the device
parameters are initialised.
*/
static void pd_init_dev_parms(struct pd_unit *disk)
{
pd_wait_for(disk, 0, DBMSG("before init_dev_parms"));
pd_send_command(disk, disk->sectors, 0, disk->heads - 1, 0, 0,
IDE_INIT_DEV_PARMS);
udelay(300);
pd_wait_for(disk, 0, "Initialise device parameters");
}
static enum action pd_door_lock(struct pd_unit *disk)
{
if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORLOCK);
pd_wait_for(disk, STAT_READY, "Lock done");
}
return Ok;
}
static enum action pd_door_unlock(struct pd_unit *disk)
{
if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
pd_wait_for(disk, STAT_READY, "Lock done");
}
return Ok;
}
static enum action pd_eject(struct pd_unit *disk)
{
pd_wait_for(disk, 0, DBMSG("before unlock on eject"));
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
pd_wait_for(disk, 0, DBMSG("after unlock on eject"));
pd_wait_for(disk, 0, DBMSG("before eject"));
pd_send_command(disk, 0, 0, 0, 0, 0, IDE_EJECT);
pd_wait_for(disk, 0, DBMSG("after eject"));
return Ok;
}
static enum action pd_media_check(struct pd_unit *disk)
{
int r = pd_wait_for(disk, STAT_READY, DBMSG("before media_check"));
if (!(r & STAT_ERR)) {
pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after READ_VRFY"));
} else
disk->changed = 1; /* say changed if other error */
if (r & ERR_MC) {
disk->changed = 1;
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_ACKCHANGE);
pd_wait_for(disk, STAT_READY, DBMSG("RDY after ACKCHANGE"));
pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after VRFY"));
}
return Ok;
}
static void pd_standby_off(struct pd_unit *disk)
{
pd_wait_for(disk, 0, DBMSG("before STANDBY"));
pd_send_command(disk, 0, 0, 0, 0, 0, IDE_STANDBY);
pd_wait_for(disk, 0, DBMSG("after STANDBY"));
}
static enum action pd_identify(struct pd_unit *disk)
{
int j;
char id[PD_ID_LEN + 1];
/* WARNING: here there may be dragons. reset() applies to both drives,
but we call it only on probing the MASTER. This should allow most
common configurations to work, but be warned that a reset can clear
settings on the SLAVE drive.
*/
if (disk->drive == 0)
pd_reset(disk);
write_reg(disk, 6, DRIVE(disk));
pd_wait_for(disk, 0, DBMSG("before IDENT"));
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_IDENTIFY);
if (pd_wait_for(disk, STAT_DRQ, DBMSG("IDENT DRQ")) & STAT_ERR)
return Fail;
pi_read_block(disk->pi, pd_scratch, 512);
disk->can_lba = pd_scratch[99] & 2;
disk->sectors = le16_to_cpu(*(__le16 *) (pd_scratch + 12));
disk->heads = le16_to_cpu(*(__le16 *) (pd_scratch + 6));
disk->cylinders = le16_to_cpu(*(__le16 *) (pd_scratch + 2));
if (disk->can_lba)
disk->capacity = le32_to_cpu(*(__le32 *) (pd_scratch + 120));
else
disk->capacity = disk->sectors * disk->heads * disk->cylinders;
for (j = 0; j < PD_ID_LEN; j++)
id[j ^ 1] = pd_scratch[j + PD_ID_OFF];
j = PD_ID_LEN - 1;
while ((j >= 0) && (id[j] <= 0x20))
j--;
j++;
id[j] = 0;
disk->removable = pd_scratch[0] & 0x80;
printk("%s: %s, %s, %d blocks [%dM], (%d/%d/%d), %s media\n",
disk->name, id,
disk->drive ? "slave" : "master",
disk->capacity, disk->capacity / 2048,
disk->cylinders, disk->heads, disk->sectors,
disk->removable ? "removable" : "fixed");
if (disk->capacity)
pd_init_dev_parms(disk);
if (!disk->standby)
pd_standby_off(disk);
return Ok;
}
/* end of io request engine */
static blk_status_t pd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct pd_unit *disk = hctx->queue->queuedata;
spin_lock_irq(&pd_lock);
if (!pd_req) {
pd_req = bd->rq;
blk_mq_start_request(pd_req);
} else
list_add_tail(&bd->rq->queuelist, &disk->rq_list);
spin_unlock_irq(&pd_lock);
run_fsm();
return BLK_STS_OK;
}
static int pd_special_command(struct pd_unit *disk,
enum action (*func)(struct pd_unit *disk))
{
struct request *rq;
struct pd_req *req;
rq = blk_mq_alloc_request(disk->gd->queue, REQ_OP_DRV_IN, 0);
if (IS_ERR(rq))
return PTR_ERR(rq);
req = blk_mq_rq_to_pdu(rq);
req->func = func;
blk_execute_rq(rq, false);
blk_mq_free_request(rq);
return 0;
}
/* kernel glue structures */
static int pd_open(struct block_device *bdev, fmode_t mode)
{
struct pd_unit *disk = bdev->bd_disk->private_data;
mutex_lock(&pd_mutex);
disk->access++;
if (disk->removable) {
pd_special_command(disk, pd_media_check);
pd_special_command(disk, pd_door_lock);
}
mutex_unlock(&pd_mutex);
return 0;
}
static int pd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct pd_unit *disk = bdev->bd_disk->private_data;
if (disk->alt_geom) {
geo->heads = PD_LOG_HEADS;
geo->sectors = PD_LOG_SECTS;
geo->cylinders = disk->capacity / (geo->heads * geo->sectors);
} else {
geo->heads = disk->heads;
geo->sectors = disk->sectors;
geo->cylinders = disk->cylinders;
}
return 0;
}
static int pd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct pd_unit *disk = bdev->bd_disk->private_data;
switch (cmd) {
case CDROMEJECT:
mutex_lock(&pd_mutex);
if (disk->access == 1)
pd_special_command(disk, pd_eject);
mutex_unlock(&pd_mutex);
return 0;
default:
return -EINVAL;
}
}
static void pd_release(struct gendisk *p, fmode_t mode)
{
struct pd_unit *disk = p->private_data;
mutex_lock(&pd_mutex);
if (!--disk->access && disk->removable)
pd_special_command(disk, pd_door_unlock);
mutex_unlock(&pd_mutex);
}
static unsigned int pd_check_events(struct gendisk *p, unsigned int clearing)
{
struct pd_unit *disk = p->private_data;
int r;
if (!disk->removable)
return 0;
pd_special_command(disk, pd_media_check);
r = disk->changed;
disk->changed = 0;
return r ? DISK_EVENT_MEDIA_CHANGE : 0;
}
static const struct block_device_operations pd_fops = {
.owner = THIS_MODULE,
.open = pd_open,
.release = pd_release,
.ioctl = pd_ioctl,
.compat_ioctl = pd_ioctl,
.getgeo = pd_getgeo,
.check_events = pd_check_events,
};
/* probing */
static const struct blk_mq_ops pd_mq_ops = {
.queue_rq = pd_queue_rq,
};
static int pd_probe_drive(struct pd_unit *disk, int autoprobe, int port,
int mode, int unit, int protocol, int delay)
{
int index = disk - pd;
int *parm = *drives[index];
struct gendisk *p;
int ret;
disk->pi = &disk->pia;
disk->access = 0;
disk->changed = 1;
disk->capacity = 0;
disk->drive = parm[D_SLV];
snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a' + index);
disk->alt_geom = parm[D_GEO];
disk->standby = parm[D_SBY];
INIT_LIST_HEAD(&disk->rq_list);
if (!pi_init(disk->pi, autoprobe, port, mode, unit, protocol, delay,
pd_scratch, PI_PD, verbose, disk->name))
return -ENXIO;
memset(&disk->tag_set, 0, sizeof(disk->tag_set));
disk->tag_set.ops = &pd_mq_ops;
disk->tag_set.cmd_size = sizeof(struct pd_req);
disk->tag_set.nr_hw_queues = 1;
disk->tag_set.nr_maps = 1;
disk->tag_set.queue_depth = 2;
disk->tag_set.numa_node = NUMA_NO_NODE;
disk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
ret = blk_mq_alloc_tag_set(&disk->tag_set);
if (ret)
goto pi_release;
p = blk_mq_alloc_disk(&disk->tag_set, disk);
if (IS_ERR(p)) {
ret = PTR_ERR(p);
goto free_tag_set;
}
disk->gd = p;
strcpy(p->disk_name, disk->name);
p->fops = &pd_fops;
p->major = major;
p->first_minor = (disk - pd) << PD_BITS;
p->minors = 1 << PD_BITS;
p->events = DISK_EVENT_MEDIA_CHANGE;
p->private_data = disk;
blk_queue_max_hw_sectors(p->queue, cluster);
blk_queue_bounce_limit(p->queue, BLK_BOUNCE_HIGH);
if (disk->drive == -1) {
for (disk->drive = 0; disk->drive <= 1; disk->drive++) {
ret = pd_special_command(disk, pd_identify);
if (ret == 0)
break;
}
} else {
ret = pd_special_command(disk, pd_identify);
}
if (ret)
goto put_disk;
set_capacity(disk->gd, disk->capacity);
ret = add_disk(disk->gd);
if (ret)
goto cleanup_disk;
return 0;
cleanup_disk:
put_disk(disk->gd);
put_disk:
put_disk(p);
disk->gd = NULL;
free_tag_set:
blk_mq_free_tag_set(&disk->tag_set);
pi_release:
pi_release(disk->pi);
return ret;
}
static int __init pd_init(void)
{
int found = 0, unit, pd_drive_count = 0;
struct pd_unit *disk;
if (disable)
return -ENODEV;
if (register_blkdev(major, name))
return -ENODEV;
printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
name, name, PD_VERSION, major, cluster, nice);
par_drv = pi_register_driver(name);
if (!par_drv) {
pr_err("failed to register %s driver\n", name);
goto out_unregister_blkdev;
}
for (unit = 0; unit < PD_UNITS; unit++) {
int *parm = *drives[unit];
if (parm[D_PRT])
pd_drive_count++;
}
if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
if (!pd_probe_drive(pd, 1, -1, -1, -1, -1, -1))
found++;
} else {
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
int *parm = *drives[unit];
if (!parm[D_PRT])
continue;
if (!pd_probe_drive(disk, 0, parm[D_PRT], parm[D_MOD],
parm[D_UNI], parm[D_PRO], parm[D_DLY]))
found++;
}
}
if (!found) {
printk("%s: no valid drive found\n", name);
goto out_pi_unregister_driver;
}
return 0;
out_pi_unregister_driver:
pi_unregister_driver(par_drv);
out_unregister_blkdev:
unregister_blkdev(major, name);
return -ENODEV;
}
static void __exit pd_exit(void)
{
struct pd_unit *disk;
int unit;
unregister_blkdev(major, name);
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
struct gendisk *p = disk->gd;
if (p) {
disk->gd = NULL;
del_gendisk(p);
put_disk(p);
blk_mq_free_tag_set(&disk->tag_set);
pi_release(disk->pi);
}
}
}
MODULE_LICENSE("GPL");
module_init(pd_init)
module_exit(pd_exit)