linux/drivers/block/paride/pd.c

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/*
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 overide 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 bool 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#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/blkdev.h>
#include <linux/blkpg.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <linux/workqueue.h>
static DEFINE_MUTEX(pd_mutex);
static DEFINE_SPINLOCK(pd_lock);
module_param(verbose, bool, 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;
};
static struct pd_unit pd[PD_UNITS];
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 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 struct request_queue *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 void run_fsm(void)
{
while (1) {
enum action res;
unsigned long saved_flags;
int stop = 0;
if (!phase) {
pd_current = pd_req->rq_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;
case 1:
pd_claimed = 2;
pi_current->proto->connect(pi_current);
}
switch(res = phase()) {
case Ok: case Fail:
pi_disconnect(pi_current);
pd_claimed = 0;
phase = NULL;
spin_lock_irqsave(&pd_lock, saved_flags);
if (!__blk_end_request_cur(pd_req,
res == Ok ? 0 : -EIO)) {
block: implement and enforce request peek/start/fetch Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight. Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users. Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by... * renaming elv_next_request() to blk_peek_request() * renaming blkdev_dequeue_request() to blk_start_request() * adding blk_fetch_request() which is combination of peek and start * disallowing completion of queued (not started) requests * applying new API to all LLDs Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating. [ Impact: block request issue API cleanup, no functional change ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-08 02:54:16 +00:00
pd_req = blk_fetch_request(pd_queue);
if (!pd_req)
stop = 1;
}
spin_unlock_irqrestore(&pd_lock, saved_flags);
if (stop)
return;
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 int pd_cmd; /* current command READ/WRITE */
static char *pd_buf; /* buffer for request in progress */
static enum action do_pd_io_start(void)
{
if (pd_req->cmd_type == REQ_TYPE_SPECIAL) {
phase = pd_special;
return pd_special();
}
pd_cmd = rq_data_dir(pd_req);
if (pd_cmd == READ || pd_cmd == WRITE) {
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 13:24:39 +00:00
pd_block = blk_rq_pos(pd_req);
pd_count = blk_rq_cur_sectors(pd_req);
if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
return Fail;
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 13:24:39 +00:00
pd_run = blk_rq_sectors(pd_req);
pd_buf = pd_req->buffer;
pd_retries = 0;
if (pd_cmd == READ)
return do_pd_read_start();
else
return do_pd_write_start();
}
return Fail;
}
static enum action pd_special(void)
{
enum action (*func)(struct pd_unit *) = pd_req->special;
return 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);
2009-04-23 02:05:19 +00:00
__blk_end_request_cur(pd_req, 0);
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 13:24:39 +00:00
pd_count = blk_rq_cur_sectors(pd_req);
pd_buf = pd_req->buffer;
spin_unlock_irqrestore(&pd_lock, saved_flags);
return 0;
}
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 void do_pd_request(struct request_queue * q)
{
if (pd_req)
return;
block: implement and enforce request peek/start/fetch Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight. Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users. Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by... * renaming elv_next_request() to blk_peek_request() * renaming blkdev_dequeue_request() to blk_start_request() * adding blk_fetch_request() which is combination of peek and start * disallowing completion of queued (not started) requests * applying new API to all LLDs Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating. [ Impact: block request issue API cleanup, no functional change ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-08 02:54:16 +00:00
pd_req = blk_fetch_request(q);
if (!pd_req)
return;
schedule_fsm();
}
static int pd_special_command(struct pd_unit *disk,
enum action (*func)(struct pd_unit *disk))
{
struct request *rq;
int err = 0;
rq = blk_get_request(disk->gd->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->special = func;
err = blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);
blk_put_request(rq);
return err;
}
/* 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 int 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);
return 0;
}
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 int pd_revalidate(struct gendisk *p)
{
struct pd_unit *disk = p->private_data;
if (pd_special_command(disk, pd_identify) == 0)
set_capacity(p, disk->capacity);
else
set_capacity(p, 0);
return 0;
}
static const struct block_device_operations pd_fops = {
.owner = THIS_MODULE,
.open = pd_open,
.release = pd_release,
.ioctl = pd_ioctl,
.getgeo = pd_getgeo,
.check_events = pd_check_events,
.revalidate_disk= pd_revalidate
};
/* probing */
static void pd_probe_drive(struct pd_unit *disk)
{
struct gendisk *p = alloc_disk(1 << PD_BITS);
if (!p)
return;
strcpy(p->disk_name, disk->name);
p->fops = &pd_fops;
p->major = major;
p->first_minor = (disk - pd) << PD_BITS;
disk->gd = p;
p->private_data = disk;
p->queue = pd_queue;
if (disk->drive == -1) {
for (disk->drive = 0; disk->drive <= 1; disk->drive++)
if (pd_special_command(disk, pd_identify) == 0)
return;
} else if (pd_special_command(disk, pd_identify) == 0)
return;
disk->gd = NULL;
put_disk(p);
}
static int pd_detect(void)
{
int found = 0, unit, pd_drive_count = 0;
struct pd_unit *disk;
for (unit = 0; unit < PD_UNITS; unit++) {
int *parm = *drives[unit];
struct pd_unit *disk = pd + unit;
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'+unit);
disk->alt_geom = parm[D_GEO];
disk->standby = parm[D_SBY];
if (parm[D_PRT])
pd_drive_count++;
}
if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
disk = pd;
if (pi_init(disk->pi, 1, -1, -1, -1, -1, -1, pd_scratch,
PI_PD, verbose, disk->name)) {
pd_probe_drive(disk);
if (!disk->gd)
pi_release(disk->pi);
}
} else {
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
int *parm = *drives[unit];
if (!parm[D_PRT])
continue;
if (pi_init(disk->pi, 0, parm[D_PRT], parm[D_MOD],
parm[D_UNI], parm[D_PRO], parm[D_DLY],
pd_scratch, PI_PD, verbose, disk->name)) {
pd_probe_drive(disk);
if (!disk->gd)
pi_release(disk->pi);
}
}
}
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
if (disk->gd) {
set_capacity(disk->gd, disk->capacity);
add_disk(disk->gd);
found = 1;
}
}
if (!found)
printk("%s: no valid drive found\n", name);
return found;
}
static int __init pd_init(void)
{
if (disable)
goto out1;
pd_queue = blk_init_queue(do_pd_request, &pd_lock);
if (!pd_queue)
goto out1;
blk_queue_max_hw_sectors(pd_queue, cluster);
if (register_blkdev(major, name))
goto out2;
printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
name, name, PD_VERSION, major, cluster, nice);
if (!pd_detect())
goto out3;
return 0;
out3:
unregister_blkdev(major, name);
out2:
blk_cleanup_queue(pd_queue);
out1:
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);
pi_release(disk->pi);
}
}
blk_cleanup_queue(pd_queue);
}
MODULE_LICENSE("GPL");
module_init(pd_init)
module_exit(pd_exit)