forked from Minki/linux
5a0e3ad6af
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>
549 lines
12 KiB
C
549 lines
12 KiB
C
/*
|
|
* IBM/3270 Driver - fullscreen driver.
|
|
*
|
|
* Author(s):
|
|
* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
|
|
* Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
* Copyright IBM Corp. 2003, 2009
|
|
*/
|
|
|
|
#include <linux/bootmem.h>
|
|
#include <linux/console.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/smp_lock.h>
|
|
|
|
#include <asm/compat.h>
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/cio.h>
|
|
#include <asm/ebcdic.h>
|
|
#include <asm/idals.h>
|
|
|
|
#include "raw3270.h"
|
|
#include "ctrlchar.h"
|
|
|
|
static struct raw3270_fn fs3270_fn;
|
|
|
|
struct fs3270 {
|
|
struct raw3270_view view;
|
|
struct pid *fs_pid; /* Pid of controlling program. */
|
|
int read_command; /* ccw command to use for reads. */
|
|
int write_command; /* ccw command to use for writes. */
|
|
int attention; /* Got attention. */
|
|
int active; /* Fullscreen view is active. */
|
|
struct raw3270_request *init; /* single init request. */
|
|
wait_queue_head_t wait; /* Init & attention wait queue. */
|
|
struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */
|
|
size_t rdbuf_size; /* size of data returned by RDBUF */
|
|
};
|
|
|
|
static DEFINE_MUTEX(fs3270_mutex);
|
|
|
|
static void
|
|
fs3270_wake_up(struct raw3270_request *rq, void *data)
|
|
{
|
|
wake_up((wait_queue_head_t *) data);
|
|
}
|
|
|
|
static inline int
|
|
fs3270_working(struct fs3270 *fp)
|
|
{
|
|
/*
|
|
* The fullscreen view is in working order if the view
|
|
* has been activated AND the initial request is finished.
|
|
*/
|
|
return fp->active && raw3270_request_final(fp->init);
|
|
}
|
|
|
|
static int
|
|
fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
|
|
{
|
|
struct fs3270 *fp;
|
|
int rc;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
rq->callback = fs3270_wake_up;
|
|
rq->callback_data = &fp->wait;
|
|
|
|
do {
|
|
if (!fs3270_working(fp)) {
|
|
/* Fullscreen view isn't ready yet. */
|
|
rc = wait_event_interruptible(fp->wait,
|
|
fs3270_working(fp));
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
rc = raw3270_start(view, rq);
|
|
if (rc == 0) {
|
|
/* Started successfully. Now wait for completion. */
|
|
wait_event(fp->wait, raw3270_request_final(rq));
|
|
}
|
|
} while (rc == -EACCES);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Switch to the fullscreen view.
|
|
*/
|
|
static void
|
|
fs3270_reset_callback(struct raw3270_request *rq, void *data)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) rq->view;
|
|
raw3270_request_reset(rq);
|
|
wake_up(&fp->wait);
|
|
}
|
|
|
|
static void
|
|
fs3270_restore_callback(struct raw3270_request *rq, void *data)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) rq->view;
|
|
if (rq->rc != 0 || rq->rescnt != 0) {
|
|
if (fp->fs_pid)
|
|
kill_pid(fp->fs_pid, SIGHUP, 1);
|
|
}
|
|
fp->rdbuf_size = 0;
|
|
raw3270_request_reset(rq);
|
|
wake_up(&fp->wait);
|
|
}
|
|
|
|
static int
|
|
fs3270_activate(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
char *cp;
|
|
int rc;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
|
|
/* If an old init command is still running just return. */
|
|
if (!raw3270_request_final(fp->init))
|
|
return 0;
|
|
|
|
if (fp->rdbuf_size == 0) {
|
|
/* No saved buffer. Just clear the screen. */
|
|
raw3270_request_set_cmd(fp->init, TC_EWRITEA);
|
|
fp->init->callback = fs3270_reset_callback;
|
|
} else {
|
|
/* Restore fullscreen buffer saved by fs3270_deactivate. */
|
|
raw3270_request_set_cmd(fp->init, TC_EWRITEA);
|
|
raw3270_request_set_idal(fp->init, fp->rdbuf);
|
|
fp->init->ccw.count = fp->rdbuf_size;
|
|
cp = fp->rdbuf->data[0];
|
|
cp[0] = TW_KR;
|
|
cp[1] = TO_SBA;
|
|
cp[2] = cp[6];
|
|
cp[3] = cp[7];
|
|
cp[4] = TO_IC;
|
|
cp[5] = TO_SBA;
|
|
cp[6] = 0x40;
|
|
cp[7] = 0x40;
|
|
fp->init->rescnt = 0;
|
|
fp->init->callback = fs3270_restore_callback;
|
|
}
|
|
rc = fp->init->rc = raw3270_start_locked(view, fp->init);
|
|
if (rc)
|
|
fp->init->callback(fp->init, NULL);
|
|
else
|
|
fp->active = 1;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Shutdown fullscreen view.
|
|
*/
|
|
static void
|
|
fs3270_save_callback(struct raw3270_request *rq, void *data)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) rq->view;
|
|
|
|
/* Correct idal buffer element 0 address. */
|
|
fp->rdbuf->data[0] -= 5;
|
|
fp->rdbuf->size += 5;
|
|
|
|
/*
|
|
* If the rdbuf command failed or the idal buffer is
|
|
* to small for the amount of data returned by the
|
|
* rdbuf command, then we have no choice but to send
|
|
* a SIGHUP to the application.
|
|
*/
|
|
if (rq->rc != 0 || rq->rescnt == 0) {
|
|
if (fp->fs_pid)
|
|
kill_pid(fp->fs_pid, SIGHUP, 1);
|
|
fp->rdbuf_size = 0;
|
|
} else
|
|
fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
|
|
raw3270_request_reset(rq);
|
|
wake_up(&fp->wait);
|
|
}
|
|
|
|
static void
|
|
fs3270_deactivate(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
fp->active = 0;
|
|
|
|
/* If an old init command is still running just return. */
|
|
if (!raw3270_request_final(fp->init))
|
|
return;
|
|
|
|
/* Prepare read-buffer request. */
|
|
raw3270_request_set_cmd(fp->init, TC_RDBUF);
|
|
/*
|
|
* Hackish: skip first 5 bytes of the idal buffer to make
|
|
* room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence
|
|
* in the activation command.
|
|
*/
|
|
fp->rdbuf->data[0] += 5;
|
|
fp->rdbuf->size -= 5;
|
|
raw3270_request_set_idal(fp->init, fp->rdbuf);
|
|
fp->init->rescnt = 0;
|
|
fp->init->callback = fs3270_save_callback;
|
|
|
|
/* Start I/O to read in the 3270 buffer. */
|
|
fp->init->rc = raw3270_start_locked(view, fp->init);
|
|
if (fp->init->rc)
|
|
fp->init->callback(fp->init, NULL);
|
|
}
|
|
|
|
static int
|
|
fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb)
|
|
{
|
|
/* Handle ATTN. Set indication and wake waiters for attention. */
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
|
|
fp->attention = 1;
|
|
wake_up(&fp->wait);
|
|
}
|
|
|
|
if (rq) {
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
|
|
rq->rc = -EIO;
|
|
else
|
|
/* Normal end. Copy residual count. */
|
|
rq->rescnt = irb->scsw.cmd.count;
|
|
}
|
|
return RAW3270_IO_DONE;
|
|
}
|
|
|
|
/*
|
|
* Process reads from fullscreen 3270.
|
|
*/
|
|
static ssize_t
|
|
fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off)
|
|
{
|
|
struct fs3270 *fp;
|
|
struct raw3270_request *rq;
|
|
struct idal_buffer *ib;
|
|
ssize_t rc;
|
|
|
|
if (count == 0 || count > 65535)
|
|
return -EINVAL;
|
|
fp = filp->private_data;
|
|
if (!fp)
|
|
return -ENODEV;
|
|
ib = idal_buffer_alloc(count, 0);
|
|
if (IS_ERR(ib))
|
|
return -ENOMEM;
|
|
rq = raw3270_request_alloc(0);
|
|
if (!IS_ERR(rq)) {
|
|
if (fp->read_command == 0 && fp->write_command != 0)
|
|
fp->read_command = 6;
|
|
raw3270_request_set_cmd(rq, fp->read_command ? : 2);
|
|
raw3270_request_set_idal(rq, ib);
|
|
rc = wait_event_interruptible(fp->wait, fp->attention);
|
|
fp->attention = 0;
|
|
if (rc == 0) {
|
|
rc = fs3270_do_io(&fp->view, rq);
|
|
if (rc == 0) {
|
|
count -= rq->rescnt;
|
|
if (idal_buffer_to_user(ib, data, count) != 0)
|
|
rc = -EFAULT;
|
|
else
|
|
rc = count;
|
|
|
|
}
|
|
}
|
|
raw3270_request_free(rq);
|
|
} else
|
|
rc = PTR_ERR(rq);
|
|
idal_buffer_free(ib);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Process writes to fullscreen 3270.
|
|
*/
|
|
static ssize_t
|
|
fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off)
|
|
{
|
|
struct fs3270 *fp;
|
|
struct raw3270_request *rq;
|
|
struct idal_buffer *ib;
|
|
int write_command;
|
|
ssize_t rc;
|
|
|
|
fp = filp->private_data;
|
|
if (!fp)
|
|
return -ENODEV;
|
|
ib = idal_buffer_alloc(count, 0);
|
|
if (IS_ERR(ib))
|
|
return -ENOMEM;
|
|
rq = raw3270_request_alloc(0);
|
|
if (!IS_ERR(rq)) {
|
|
if (idal_buffer_from_user(ib, data, count) == 0) {
|
|
write_command = fp->write_command ? : 1;
|
|
if (write_command == 5)
|
|
write_command = 13;
|
|
raw3270_request_set_cmd(rq, write_command);
|
|
raw3270_request_set_idal(rq, ib);
|
|
rc = fs3270_do_io(&fp->view, rq);
|
|
if (rc == 0)
|
|
rc = count - rq->rescnt;
|
|
} else
|
|
rc = -EFAULT;
|
|
raw3270_request_free(rq);
|
|
} else
|
|
rc = PTR_ERR(rq);
|
|
idal_buffer_free(ib);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* process ioctl commands for the tube driver
|
|
*/
|
|
static long
|
|
fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
char __user *argp;
|
|
struct fs3270 *fp;
|
|
struct raw3270_iocb iocb;
|
|
int rc;
|
|
|
|
fp = filp->private_data;
|
|
if (!fp)
|
|
return -ENODEV;
|
|
if (is_compat_task())
|
|
argp = compat_ptr(arg);
|
|
else
|
|
argp = (char __user *)arg;
|
|
rc = 0;
|
|
mutex_lock(&fs3270_mutex);
|
|
switch (cmd) {
|
|
case TUBICMD:
|
|
fp->read_command = arg;
|
|
break;
|
|
case TUBOCMD:
|
|
fp->write_command = arg;
|
|
break;
|
|
case TUBGETI:
|
|
rc = put_user(fp->read_command, argp);
|
|
break;
|
|
case TUBGETO:
|
|
rc = put_user(fp->write_command, argp);
|
|
break;
|
|
case TUBGETMOD:
|
|
iocb.model = fp->view.model;
|
|
iocb.line_cnt = fp->view.rows;
|
|
iocb.col_cnt = fp->view.cols;
|
|
iocb.pf_cnt = 24;
|
|
iocb.re_cnt = 20;
|
|
iocb.map = 0;
|
|
if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb)))
|
|
rc = -EFAULT;
|
|
break;
|
|
}
|
|
mutex_unlock(&fs3270_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Allocate fs3270 structure.
|
|
*/
|
|
static struct fs3270 *
|
|
fs3270_alloc_view(void)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL);
|
|
if (!fp)
|
|
return ERR_PTR(-ENOMEM);
|
|
fp->init = raw3270_request_alloc(0);
|
|
if (IS_ERR(fp->init)) {
|
|
kfree(fp);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
return fp;
|
|
}
|
|
|
|
/*
|
|
* Free fs3270 structure.
|
|
*/
|
|
static void
|
|
fs3270_free_view(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
if (fp->rdbuf)
|
|
idal_buffer_free(fp->rdbuf);
|
|
raw3270_request_free(((struct fs3270 *) view)->init);
|
|
kfree(view);
|
|
}
|
|
|
|
/*
|
|
* Unlink fs3270 data structure from filp.
|
|
*/
|
|
static void
|
|
fs3270_release(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
if (fp->fs_pid)
|
|
kill_pid(fp->fs_pid, SIGHUP, 1);
|
|
}
|
|
|
|
/* View to a 3270 device. Can be console, tty or fullscreen. */
|
|
static struct raw3270_fn fs3270_fn = {
|
|
.activate = fs3270_activate,
|
|
.deactivate = fs3270_deactivate,
|
|
.intv = (void *) fs3270_irq,
|
|
.release = fs3270_release,
|
|
.free = fs3270_free_view
|
|
};
|
|
|
|
/*
|
|
* This routine is called whenever a 3270 fullscreen device is opened.
|
|
*/
|
|
static int
|
|
fs3270_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct fs3270 *fp;
|
|
struct idal_buffer *ib;
|
|
int minor, rc = 0;
|
|
|
|
if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR)
|
|
return -ENODEV;
|
|
minor = iminor(filp->f_path.dentry->d_inode);
|
|
/* Check for minor 0 multiplexer. */
|
|
if (minor == 0) {
|
|
struct tty_struct *tty = get_current_tty();
|
|
if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
|
|
tty_kref_put(tty);
|
|
return -ENODEV;
|
|
}
|
|
minor = tty->index + RAW3270_FIRSTMINOR;
|
|
tty_kref_put(tty);
|
|
}
|
|
mutex_lock(&fs3270_mutex);
|
|
/* Check if some other program is already using fullscreen mode. */
|
|
fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
|
|
if (!IS_ERR(fp)) {
|
|
raw3270_put_view(&fp->view);
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
/* Allocate fullscreen view structure. */
|
|
fp = fs3270_alloc_view();
|
|
if (IS_ERR(fp)) {
|
|
rc = PTR_ERR(fp);
|
|
goto out;
|
|
}
|
|
|
|
init_waitqueue_head(&fp->wait);
|
|
fp->fs_pid = get_pid(task_pid(current));
|
|
rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
|
|
if (rc) {
|
|
fs3270_free_view(&fp->view);
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate idal-buffer. */
|
|
ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0);
|
|
if (IS_ERR(ib)) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
rc = PTR_ERR(ib);
|
|
goto out;
|
|
}
|
|
fp->rdbuf = ib;
|
|
|
|
rc = raw3270_activate_view(&fp->view);
|
|
if (rc) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
goto out;
|
|
}
|
|
filp->private_data = fp;
|
|
out:
|
|
mutex_unlock(&fs3270_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This routine is called when the 3270 tty is closed. We wait
|
|
* for the remaining request to be completed. Then we clean up.
|
|
*/
|
|
static int
|
|
fs3270_close(struct inode *inode, struct file *filp)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = filp->private_data;
|
|
filp->private_data = NULL;
|
|
if (fp) {
|
|
put_pid(fp->fs_pid);
|
|
fp->fs_pid = NULL;
|
|
raw3270_reset(&fp->view);
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations fs3270_fops = {
|
|
.owner = THIS_MODULE, /* owner */
|
|
.read = fs3270_read, /* read */
|
|
.write = fs3270_write, /* write */
|
|
.unlocked_ioctl = fs3270_ioctl, /* ioctl */
|
|
.compat_ioctl = fs3270_ioctl, /* ioctl */
|
|
.open = fs3270_open, /* open */
|
|
.release = fs3270_close, /* release */
|
|
};
|
|
|
|
/*
|
|
* 3270 fullscreen driver initialization.
|
|
*/
|
|
static int __init
|
|
fs3270_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops);
|
|
if (rc)
|
|
return rc;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
fs3270_exit(void)
|
|
{
|
|
unregister_chrdev(IBM_FS3270_MAJOR, "fs3270");
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR);
|
|
|
|
module_init(fs3270_init);
|
|
module_exit(fs3270_exit);
|