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linux/drivers/block/paride/pg.c

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/*
pg.c (c) 1998 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
The pg driver provides a simple character device interface for
sending ATAPI commands to a device. With the exception of the
ATAPI reset operation, all operations are performed by a pair
of read and write operations to the appropriate /dev/pgN device.
A write operation delivers a command and any outbound data in
a single buffer. Normally, the write will succeed unless the
device is offline or malfunctioning, or there is already another
command pending. If the write succeeds, it should be followed
immediately by a read operation, to obtain any returned data and
status information. A read will fail if there is no operation
in progress.
As a special case, the device can be reset with a write operation,
and in this case, no following read is expected, or permitted.
There are no ioctl() operations. Any single operation
may transfer at most PG_MAX_DATA bytes. Note that the driver must
copy the data through an internal buffer. In keeping with all
current ATAPI devices, command packets are assumed to be exactly
12 bytes in length.
To permit future changes to this interface, the headers in the
read and write buffers contain a single character "magic" flag.
Currently this flag must be the character "P".
By default, the driver will autoprobe for a single parallel
port ATAPI device, but if their individual parameters are
specified, the driver can handle up to 4 devices.
To use this device, you must have the following device
special files defined:
/dev/pg0 c 97 0
/dev/pg1 c 97 1
/dev/pg2 c 97 2
/dev/pg3 c 97 3
(You'll need to change the 97 to something else if you use
the 'major' parameter to install the driver on a different
major number.)
The behaviour of the pg 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 1-6 integers as follows:
drive2
drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
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)
<slv> ATAPI devices 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.
<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)
major You may use this parameter to overide the
default major number (97) 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 "pg").
verbose This parameter controls the amount of logging
that is done by the driver. Set it to 0 for
quiet operation, to 1 to enable progress
messages while the driver probes for devices,
or to 2 for full debug logging. (default 0)
If this driver is built into the kernel, you can use
the following command line parameters, with the same values
as the corresponding module parameters listed above:
pg.drive0
pg.drive1
pg.drive2
pg.drive3
In addition, you can use the parameter pg.disable to disable
the driver entirely.
*/
/* Changes:
1.01 GRG 1998.06.16 Bug fixes
1.02 GRG 1998.09.24 Added jumbo support
*/
#define PG_VERSION "1.02"
#define PG_MAJOR 97
#define PG_NAME "pg"
#define PG_UNITS 4
#ifndef PI_PG
#define PI_PG 4
#endif
/* Here are things one can override from the insmod command.
Most are autoprobed by paride unless set here. Verbose is 0
by default.
*/
static int verbose = 0;
static int major = PG_MAJOR;
static char *name = PG_NAME;
static int disable = 0;
static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
static int pg_drive_count;
enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
/* end of parameters */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mtio.h>
#include <linux/pg.h>
#include <linux/device.h>
[PATCH] fix missing includes I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 23:03:48 +00:00
#include <linux/sched.h> /* current, TASK_* */
drivers: autoconvert trivial BKL users to private mutex All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-06-02 12:28:52 +00:00
#include <linux/mutex.h>
[PATCH] fix missing includes I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 23:03:48 +00:00
#include <linux/jiffies.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
#include <asm/uaccess.h>
module_param(verbose, bool, 0644);
module_param(major, int, 0);
module_param(name, charp, 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 PG_SPIN_DEL 50 /* spin delay in micro-seconds */
#define PG_SPIN 200
#define PG_TMO HZ
#define PG_RESET_TMO 10*HZ
#define STAT_ERR 0x01
#define STAT_INDEX 0x02
#define STAT_ECC 0x04
#define STAT_DRQ 0x08
#define STAT_SEEK 0x10
#define STAT_WRERR 0x20
#define STAT_READY 0x40
#define STAT_BUSY 0x80
#define ATAPI_IDENTIFY 0x12
drivers: autoconvert trivial BKL users to private mutex All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-06-02 12:28:52 +00:00
static DEFINE_MUTEX(pg_mutex);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
static int pg_open(struct inode *inode, struct file *file);
static int pg_release(struct inode *inode, struct file *file);
static ssize_t pg_read(struct file *filp, char __user *buf,
size_t count, loff_t * ppos);
static ssize_t pg_write(struct file *filp, const char __user *buf,
size_t count, loff_t * ppos);
static int pg_detect(void);
#define PG_NAMELEN 8
struct pg {
struct pi_adapter pia; /* interface to paride layer */
struct pi_adapter *pi;
int busy; /* write done, read expected */
int start; /* jiffies at command start */
int dlen; /* transfer size requested */
unsigned long timeout; /* timeout requested */
int status; /* last sense key */
int drive; /* drive */
unsigned long access; /* count of active opens ... */
int present; /* device present ? */
char *bufptr;
char name[PG_NAMELEN]; /* pg0, pg1, ... */
};
static struct pg devices[PG_UNITS];
static int pg_identify(struct pg *dev, int log);
static char pg_scratch[512]; /* scratch block buffer */
[PATCH] class: convert drivers/block/* to use the new class api instead of class_simple Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-03-23 17:52:10 +00:00
static struct class *pg_class;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* kernel glue structures */
[PATCH] mark struct file_operations const 3 Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 08:55:32 +00:00
static const struct file_operations pg_fops = {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.owner = THIS_MODULE,
.read = pg_read,
.write = pg_write,
.open = pg_open,
.release = pg_release,
llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 16:52:59 +00:00
.llseek = noop_llseek,
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
};
static void pg_init_units(void)
{
int unit;
pg_drive_count = 0;
for (unit = 0; unit < PG_UNITS; unit++) {
int *parm = *drives[unit];
struct pg *dev = &devices[unit];
dev->pi = &dev->pia;
clear_bit(0, &dev->access);
dev->busy = 0;
dev->present = 0;
dev->bufptr = NULL;
dev->drive = parm[D_SLV];
snprintf(dev->name, PG_NAMELEN, "%s%c", name, 'a'+unit);
if (parm[D_PRT])
pg_drive_count++;
}
}
static inline int status_reg(struct pg *dev)
{
return pi_read_regr(dev->pi, 1, 6);
}
static inline int read_reg(struct pg *dev, int reg)
{
return pi_read_regr(dev->pi, 0, reg);
}
static inline void write_reg(struct pg *dev, int reg, int val)
{
pi_write_regr(dev->pi, 0, reg, val);
}
static inline u8 DRIVE(struct pg *dev)
{
return 0xa0+0x10*dev->drive;
}
static void pg_sleep(int cs)
{
[PATCH] drivers/block: fix-up schedule_timeout() usage Use schedule_timeout_{un,}interruptible() instead of set_current_state()/schedule_timeout() to reduce kernel size. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 07:27:28 +00:00
schedule_timeout_interruptible(cs);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
static int pg_wait(struct pg *dev, int go, int stop, unsigned long tmo, char *msg)
{
int j, r, e, s, p, to;
dev->status = 0;
j = 0;
while ((((r = status_reg(dev)) & go) || (stop && (!(r & stop))))
&& time_before(jiffies, tmo)) {
if (j++ < PG_SPIN)
udelay(PG_SPIN_DEL);
else
pg_sleep(1);
}
to = time_after_eq(jiffies, tmo);
if ((r & (STAT_ERR & stop)) || to) {
s = read_reg(dev, 7);
e = read_reg(dev, 1);
p = read_reg(dev, 2);
if (verbose > 1)
printk("%s: %s: stat=0x%x err=0x%x phase=%d%s\n",
dev->name, msg, s, e, p, to ? " timeout" : "");
if (to)
e |= 0x100;
dev->status = (e >> 4) & 0xff;
return -1;
}
return 0;
}
static int pg_command(struct pg *dev, char *cmd, int dlen, unsigned long tmo)
{
int k;
pi_connect(dev->pi);
write_reg(dev, 6, DRIVE(dev));
if (pg_wait(dev, STAT_BUSY | STAT_DRQ, 0, tmo, "before command"))
goto fail;
write_reg(dev, 4, dlen % 256);
write_reg(dev, 5, dlen / 256);
write_reg(dev, 7, 0xa0); /* ATAPI packet command */
if (pg_wait(dev, STAT_BUSY, STAT_DRQ, tmo, "command DRQ"))
goto fail;
if (read_reg(dev, 2) != 1) {
printk("%s: command phase error\n", dev->name);
goto fail;
}
pi_write_block(dev->pi, cmd, 12);
if (verbose > 1) {
printk("%s: Command sent, dlen=%d packet= ", dev->name, dlen);
for (k = 0; k < 12; k++)
printk("%02x ", cmd[k] & 0xff);
printk("\n");
}
return 0;
fail:
pi_disconnect(dev->pi);
return -1;
}
static int pg_completion(struct pg *dev, char *buf, unsigned long tmo)
{
int r, d, n, p;
r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
tmo, "completion");
dev->dlen = 0;
while (read_reg(dev, 7) & STAT_DRQ) {
d = (read_reg(dev, 4) + 256 * read_reg(dev, 5));
n = ((d + 3) & 0xfffc);
p = read_reg(dev, 2) & 3;
if (p == 0)
pi_write_block(dev->pi, buf, n);
if (p == 2)
pi_read_block(dev->pi, buf, n);
if (verbose > 1)
printk("%s: %s %d bytes\n", dev->name,
p ? "Read" : "Write", n);
dev->dlen += (1 - p) * d;
buf += d;
r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
tmo, "completion");
}
pi_disconnect(dev->pi);
return r;
}
static int pg_reset(struct pg *dev)
{
int i, k, err;
int expect[5] = { 1, 1, 1, 0x14, 0xeb };
int got[5];
pi_connect(dev->pi);
write_reg(dev, 6, DRIVE(dev));
write_reg(dev, 7, 8);
pg_sleep(20 * HZ / 1000);
k = 0;
while ((k++ < PG_RESET_TMO) && (status_reg(dev) & STAT_BUSY))
pg_sleep(1);
for (i = 0; i < 5; i++)
got[i] = read_reg(dev, i + 1);
err = memcmp(expect, got, sizeof(got)) ? -1 : 0;
if (verbose) {
printk("%s: Reset (%d) signature = ", dev->name, k);
for (i = 0; i < 5; i++)
printk("%3x", got[i]);
if (err)
printk(" (incorrect)");
printk("\n");
}
pi_disconnect(dev->pi);
return err;
}
static void xs(char *buf, char *targ, int len)
{
char l = '\0';
int k;
for (k = 0; k < len; k++) {
char c = *buf++;
paride/pg.c: xs(): &&/|| confusion &&/|| confusion Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-02-16 12:11:55 +00:00
if (c != ' ' && c != l)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
l = *targ++ = c;
}
if (l == ' ')
targ--;
*targ = '\0';
}
static int pg_identify(struct pg *dev, int log)
{
int s;
char *ms[2] = { "master", "slave" };
char mf[10], id[18];
char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
char buf[36];
s = pg_command(dev, id_cmd, 36, jiffies + PG_TMO);
if (s)
return -1;
s = pg_completion(dev, buf, jiffies + PG_TMO);
if (s)
return -1;
if (log) {
xs(buf + 8, mf, 8);
xs(buf + 16, id, 16);
printk("%s: %s %s, %s\n", dev->name, mf, id, ms[dev->drive]);
}
return 0;
}
/*
* returns 0, with id set if drive is detected
* -1, if drive detection failed
*/
static int pg_probe(struct pg *dev)
{
if (dev->drive == -1) {
for (dev->drive = 0; dev->drive <= 1; dev->drive++)
if (!pg_reset(dev))
return pg_identify(dev, 1);
} else {
if (!pg_reset(dev))
return pg_identify(dev, 1);
}
return -1;
}
static int pg_detect(void)
{
struct pg *dev = &devices[0];
int k, unit;
printk("%s: %s version %s, major %d\n", name, name, PG_VERSION, major);
k = 0;
if (pg_drive_count == 0) {
if (pi_init(dev->pi, 1, -1, -1, -1, -1, -1, pg_scratch,
PI_PG, verbose, dev->name)) {
if (!pg_probe(dev)) {
dev->present = 1;
k++;
} else
pi_release(dev->pi);
}
} else
for (unit = 0; unit < PG_UNITS; unit++, dev++) {
int *parm = *drives[unit];
if (!parm[D_PRT])
continue;
if (pi_init(dev->pi, 0, parm[D_PRT], parm[D_MOD],
parm[D_UNI], parm[D_PRO], parm[D_DLY],
pg_scratch, PI_PG, verbose, dev->name)) {
if (!pg_probe(dev)) {
dev->present = 1;
k++;
} else
pi_release(dev->pi);
}
}
if (k)
return 0;
printk("%s: No ATAPI device detected\n", name);
return -1;
}
static int pg_open(struct inode *inode, struct file *file)
{
int unit = iminor(inode) & 0x7f;
struct pg *dev = &devices[unit];
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
int ret = 0;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
drivers: autoconvert trivial BKL users to private mutex All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-06-02 12:28:52 +00:00
mutex_lock(&pg_mutex);
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
if ((unit >= PG_UNITS) || (!dev->present)) {
ret = -ENODEV;
goto out;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
if (test_and_set_bit(0, &dev->access)) {
ret = -EBUSY;
goto out;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
if (dev->busy) {
pg_reset(dev);
dev->busy = 0;
}
pg_identify(dev, (verbose > 1));
dev->bufptr = kmalloc(PG_MAX_DATA, GFP_KERNEL);
if (dev->bufptr == NULL) {
clear_bit(0, &dev->access);
printk("%s: buffer allocation failed\n", dev->name);
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
ret = -ENOMEM;
goto out;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
file->private_data = dev;
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
out:
drivers: autoconvert trivial BKL users to private mutex All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-06-02 12:28:52 +00:00
mutex_unlock(&pg_mutex);
paride: cdev lock_kernel() pushdown Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-05-15 16:07:56 +00:00
return ret;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
static int pg_release(struct inode *inode, struct file *file)
{
struct pg *dev = file->private_data;
kfree(dev->bufptr);
dev->bufptr = NULL;
clear_bit(0, &dev->access);
return 0;
}
static ssize_t pg_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos)
{
struct pg *dev = filp->private_data;
struct pg_write_hdr hdr;
int hs = sizeof (hdr);
if (dev->busy)
return -EBUSY;
if (count < hs)
return -EINVAL;
if (copy_from_user(&hdr, buf, hs))
return -EFAULT;
if (hdr.magic != PG_MAGIC)
return -EINVAL;
if (hdr.dlen > PG_MAX_DATA)
return -EINVAL;
if ((count - hs) > PG_MAX_DATA)
return -EINVAL;
if (hdr.func == PG_RESET) {
if (count != hs)
return -EINVAL;
if (pg_reset(dev))
return -EIO;
return count;
}
if (hdr.func != PG_COMMAND)
return -EINVAL;
dev->start = jiffies;
dev->timeout = hdr.timeout * HZ + HZ / 2 + jiffies;
if (pg_command(dev, hdr.packet, hdr.dlen, jiffies + PG_TMO)) {
if (dev->status & 0x10)
return -ETIME;
return -EIO;
}
dev->busy = 1;
if (copy_from_user(dev->bufptr, buf + hs, count - hs))
return -EFAULT;
return count;
}
static ssize_t pg_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
{
struct pg *dev = filp->private_data;
struct pg_read_hdr hdr;
int hs = sizeof (hdr);
int copy;
if (!dev->busy)
return -EINVAL;
if (count < hs)
return -EINVAL;
dev->busy = 0;
if (pg_completion(dev, dev->bufptr, dev->timeout))
if (dev->status & 0x10)
return -ETIME;
hdr.magic = PG_MAGIC;
hdr.dlen = dev->dlen;
copy = 0;
if (hdr.dlen < 0) {
hdr.dlen = -1 * hdr.dlen;
copy = hdr.dlen;
if (copy > (count - hs))
copy = count - hs;
}
hdr.duration = (jiffies - dev->start + HZ / 2) / HZ;
hdr.scsi = dev->status & 0x0f;
if (copy_to_user(buf, &hdr, hs))
return -EFAULT;
if (copy > 0)
if (copy_to_user(buf + hs, dev->bufptr, copy))
return -EFAULT;
return copy + hs;
}
static int __init pg_init(void)
{
[PATCH] paride: register_chrdev fix If the user specified `major=0' (odd thing to do), pg.c will use dynamic allocation. We need to pick up that major for subsequent unregister_chrdev(). Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:56:18 +00:00
int unit;
int err;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
if (disable){
[PATCH] paride: return proper error code This patch makes module init return proper value instead of -1 (-EPERM). Cc: Tim Waugh <tim@cyberelk.net> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07 04:36:43 +00:00
err = -EINVAL;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
goto out;
}
pg_init_units();
if (pg_detect()) {
[PATCH] paride: return proper error code This patch makes module init return proper value instead of -1 (-EPERM). Cc: Tim Waugh <tim@cyberelk.net> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07 04:36:43 +00:00
err = -ENODEV;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
goto out;
}
[PATCH] paride: register_chrdev fix If the user specified `major=0' (odd thing to do), pg.c will use dynamic allocation. We need to pick up that major for subsequent unregister_chrdev(). Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:56:18 +00:00
err = register_chrdev(major, name, &pg_fops);
if (err < 0) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
printk("pg_init: unable to get major number %d\n", major);
for (unit = 0; unit < PG_UNITS; unit++) {
struct pg *dev = &devices[unit];
if (dev->present)
pi_release(dev->pi);
}
goto out;
}
[PATCH] paride: register_chrdev fix If the user specified `major=0' (odd thing to do), pg.c will use dynamic allocation. We need to pick up that major for subsequent unregister_chrdev(). Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:56:18 +00:00
major = err; /* In case the user specified `major=0' (dynamic) */
[PATCH] class: convert drivers/block/* to use the new class api instead of class_simple Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-03-23 17:52:10 +00:00
pg_class = class_create(THIS_MODULE, "pg");
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
if (IS_ERR(pg_class)) {
err = PTR_ERR(pg_class);
goto out_chrdev;
}
for (unit = 0; unit < PG_UNITS; unit++) {
struct pg *dev = &devices[unit];
[PATCH] devfs: Remove devfs_mk_cdev() function from the kernel tree Removes the devfs_mk_cdev() function and all callers of it. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-21 04:15:16 +00:00
if (dev->present)
device create: block: convert device_create_drvdata to device_create Now that device_create() has been audited, rename things back to the original call to be sane. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-22 03:03:34 +00:00
device_create(pg_class, NULL, MKDEV(major, unit), NULL,
"pg%u", unit);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
err = 0;
goto out;
out_chrdev:
unregister_chrdev(major, "pg");
out:
return err;
}
static void __exit pg_exit(void)
{
int unit;
for (unit = 0; unit < PG_UNITS; unit++) {
struct pg *dev = &devices[unit];
[PATCH] devfs: Remove devfs_remove() function from the kernel tree Removes the devfs_remove() function and all callers of it. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-21 04:15:16 +00:00
if (dev->present)
paride: Convert from class_device to device for block/paride struct class_device is going away, this converts the code to use struct device instead. Signed-off-by: Tony Jones <tonyj@suse.de> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-09-25 00:03:03 +00:00
device_destroy(pg_class, MKDEV(major, unit));
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
[PATCH] class: convert drivers/block/* to use the new class api instead of class_simple Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-03-23 17:52:10 +00:00
class_destroy(pg_class);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
unregister_chrdev(major, name);
for (unit = 0; unit < PG_UNITS; unit++) {
struct pg *dev = &devices[unit];
if (dev->present)
pi_release(dev->pi);
}
}
MODULE_LICENSE("GPL");
module_init(pg_init)
module_exit(pg_exit)
Reference in a new issue Copy permalink