mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:56:44 +07:00
88abaab4f9
Convert all kmalloc + memset sequences in drivers/s390 to kzalloc usage. Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
811 lines
21 KiB
C
811 lines
21 KiB
C
/*
|
|
* dcssblk.c -- the S/390 block driver for dcss memory
|
|
*
|
|
* Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/blkdev.h>
|
|
#include <asm/extmem.h>
|
|
#include <asm/io.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/s390_rdev.h>
|
|
|
|
//#define DCSSBLK_DEBUG /* Debug messages on/off */
|
|
#define DCSSBLK_NAME "dcssblk"
|
|
#define DCSSBLK_MINORS_PER_DISK 1
|
|
#define DCSSBLK_PARM_LEN 400
|
|
|
|
#ifdef DCSSBLK_DEBUG
|
|
#define PRINT_DEBUG(x...) printk(KERN_DEBUG DCSSBLK_NAME " debug: " x)
|
|
#else
|
|
#define PRINT_DEBUG(x...) do {} while (0)
|
|
#endif
|
|
#define PRINT_INFO(x...) printk(KERN_INFO DCSSBLK_NAME " info: " x)
|
|
#define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x)
|
|
#define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x)
|
|
|
|
|
|
static int dcssblk_open(struct inode *inode, struct file *filp);
|
|
static int dcssblk_release(struct inode *inode, struct file *filp);
|
|
static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
|
|
static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
|
|
unsigned long *data);
|
|
|
|
static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
|
|
|
|
static int dcssblk_major;
|
|
static struct block_device_operations dcssblk_devops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dcssblk_open,
|
|
.release = dcssblk_release,
|
|
.direct_access = dcssblk_direct_access,
|
|
};
|
|
|
|
static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf,
|
|
size_t count);
|
|
static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
|
|
size_t count);
|
|
static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
|
|
size_t count);
|
|
static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
|
|
static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
|
|
size_t count);
|
|
static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
|
|
|
|
static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
|
|
static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
|
|
static DEVICE_ATTR(save, S_IWUSR | S_IRUGO, dcssblk_save_show,
|
|
dcssblk_save_store);
|
|
static DEVICE_ATTR(shared, S_IWUSR | S_IRUGO, dcssblk_shared_show,
|
|
dcssblk_shared_store);
|
|
|
|
static struct device *dcssblk_root_dev;
|
|
|
|
struct dcssblk_dev_info {
|
|
struct list_head lh;
|
|
struct device dev;
|
|
char segment_name[BUS_ID_SIZE];
|
|
atomic_t use_count;
|
|
struct gendisk *gd;
|
|
unsigned long start;
|
|
unsigned long end;
|
|
int segment_type;
|
|
unsigned char save_pending;
|
|
unsigned char is_shared;
|
|
struct request_queue *dcssblk_queue;
|
|
};
|
|
|
|
static struct list_head dcssblk_devices = LIST_HEAD_INIT(dcssblk_devices);
|
|
static struct rw_semaphore dcssblk_devices_sem;
|
|
|
|
/*
|
|
* release function for segment device.
|
|
*/
|
|
static void
|
|
dcssblk_release_segment(struct device *dev)
|
|
{
|
|
PRINT_DEBUG("segment release fn called for %s\n", dev->bus_id);
|
|
kfree(container_of(dev, struct dcssblk_dev_info, dev));
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
/*
|
|
* get a minor number. needs to be called with
|
|
* down_write(&dcssblk_devices_sem) and the
|
|
* device needs to be enqueued before the semaphore is
|
|
* freed.
|
|
*/
|
|
static inline int
|
|
dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info)
|
|
{
|
|
int minor, found;
|
|
struct dcssblk_dev_info *entry;
|
|
|
|
if (dev_info == NULL)
|
|
return -EINVAL;
|
|
for (minor = 0; minor < (1<<MINORBITS); minor++) {
|
|
found = 0;
|
|
// test if minor available
|
|
list_for_each_entry(entry, &dcssblk_devices, lh)
|
|
if (minor == entry->gd->first_minor)
|
|
found++;
|
|
if (!found) break; // got unused minor
|
|
}
|
|
if (found)
|
|
return -EBUSY;
|
|
dev_info->gd->first_minor = minor;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* get the struct dcssblk_dev_info from dcssblk_devices
|
|
* for the given name.
|
|
* down_read(&dcssblk_devices_sem) must be held.
|
|
*/
|
|
static struct dcssblk_dev_info *
|
|
dcssblk_get_device_by_name(char *name)
|
|
{
|
|
struct dcssblk_dev_info *entry;
|
|
|
|
list_for_each_entry(entry, &dcssblk_devices, lh) {
|
|
if (!strcmp(name, entry->segment_name)) {
|
|
return entry;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* print appropriate error message for segment_load()/segment_type()
|
|
* return code
|
|
*/
|
|
static void
|
|
dcssblk_segment_warn(int rc, char* seg_name)
|
|
{
|
|
switch (rc) {
|
|
case -ENOENT:
|
|
PRINT_WARN("cannot load/query segment %s, does not exist\n",
|
|
seg_name);
|
|
break;
|
|
case -ENOSYS:
|
|
PRINT_WARN("cannot load/query segment %s, not running on VM\n",
|
|
seg_name);
|
|
break;
|
|
case -EIO:
|
|
PRINT_WARN("cannot load/query segment %s, hardware error\n",
|
|
seg_name);
|
|
break;
|
|
case -ENOTSUPP:
|
|
PRINT_WARN("cannot load/query segment %s, is a multi-part "
|
|
"segment\n", seg_name);
|
|
break;
|
|
case -ENOSPC:
|
|
PRINT_WARN("cannot load/query segment %s, overlaps with "
|
|
"storage\n", seg_name);
|
|
break;
|
|
case -EBUSY:
|
|
PRINT_WARN("cannot load/query segment %s, overlaps with "
|
|
"already loaded dcss\n", seg_name);
|
|
break;
|
|
case -EPERM:
|
|
PRINT_WARN("cannot load/query segment %s, already loaded in "
|
|
"incompatible mode\n", seg_name);
|
|
break;
|
|
case -ENOMEM:
|
|
PRINT_WARN("cannot load/query segment %s, out of memory\n",
|
|
seg_name);
|
|
break;
|
|
case -ERANGE:
|
|
PRINT_WARN("cannot load/query segment %s, exceeds kernel "
|
|
"mapping range\n", seg_name);
|
|
break;
|
|
default:
|
|
PRINT_WARN("cannot load/query segment %s, return value %i\n",
|
|
seg_name, rc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* device attribute for switching shared/nonshared (exclusive)
|
|
* operation (show + store)
|
|
*/
|
|
static ssize_t
|
|
dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
|
|
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
|
|
return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
int rc;
|
|
|
|
if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) {
|
|
PRINT_WARN("Invalid value, must be 0 or 1\n");
|
|
return -EINVAL;
|
|
}
|
|
down_write(&dcssblk_devices_sem);
|
|
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
|
|
if (atomic_read(&dev_info->use_count)) {
|
|
PRINT_ERR("share: segment %s is busy!\n",
|
|
dev_info->segment_name);
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
if (inbuf[0] == '1') {
|
|
// reload segment in shared mode
|
|
rc = segment_modify_shared(dev_info->segment_name,
|
|
SEGMENT_SHARED);
|
|
if (rc < 0) {
|
|
BUG_ON(rc == -EINVAL);
|
|
if (rc == -EIO || rc == -ENOENT)
|
|
goto removeseg;
|
|
} else {
|
|
dev_info->is_shared = 1;
|
|
switch (dev_info->segment_type) {
|
|
case SEG_TYPE_SR:
|
|
case SEG_TYPE_ER:
|
|
case SEG_TYPE_SC:
|
|
set_disk_ro(dev_info->gd,1);
|
|
}
|
|
}
|
|
} else if (inbuf[0] == '0') {
|
|
// reload segment in exclusive mode
|
|
if (dev_info->segment_type == SEG_TYPE_SC) {
|
|
PRINT_ERR("Segment type SC (%s) cannot be loaded in "
|
|
"non-shared mode\n", dev_info->segment_name);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
rc = segment_modify_shared(dev_info->segment_name,
|
|
SEGMENT_EXCLUSIVE);
|
|
if (rc < 0) {
|
|
BUG_ON(rc == -EINVAL);
|
|
if (rc == -EIO || rc == -ENOENT)
|
|
goto removeseg;
|
|
} else {
|
|
dev_info->is_shared = 0;
|
|
set_disk_ro(dev_info->gd, 0);
|
|
}
|
|
} else {
|
|
PRINT_WARN("Invalid value, must be 0 or 1\n");
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
rc = count;
|
|
goto out;
|
|
|
|
removeseg:
|
|
PRINT_ERR("Could not reload segment %s, removing it now!\n",
|
|
dev_info->segment_name);
|
|
list_del(&dev_info->lh);
|
|
|
|
del_gendisk(dev_info->gd);
|
|
blk_cleanup_queue(dev_info->dcssblk_queue);
|
|
dev_info->gd->queue = NULL;
|
|
put_disk(dev_info->gd);
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
out:
|
|
up_write(&dcssblk_devices_sem);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* device attribute for save operation on current copy
|
|
* of the segment. If the segment is busy, saving will
|
|
* become pending until it gets released, which can be
|
|
* undone by storing a non-true value to this entry.
|
|
* (show + store)
|
|
*/
|
|
static ssize_t
|
|
dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
|
|
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
|
|
return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
|
|
if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) {
|
|
PRINT_WARN("Invalid value, must be 0 or 1\n");
|
|
return -EINVAL;
|
|
}
|
|
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
|
|
|
|
down_write(&dcssblk_devices_sem);
|
|
if (inbuf[0] == '1') {
|
|
if (atomic_read(&dev_info->use_count) == 0) {
|
|
// device is idle => we save immediately
|
|
PRINT_INFO("Saving segment %s\n",
|
|
dev_info->segment_name);
|
|
segment_save(dev_info->segment_name);
|
|
} else {
|
|
// device is busy => we save it when it becomes
|
|
// idle in dcssblk_release
|
|
PRINT_INFO("Segment %s is currently busy, it will "
|
|
"be saved when it becomes idle...\n",
|
|
dev_info->segment_name);
|
|
dev_info->save_pending = 1;
|
|
}
|
|
} else if (inbuf[0] == '0') {
|
|
if (dev_info->save_pending) {
|
|
// device is busy & the user wants to undo his save
|
|
// request
|
|
dev_info->save_pending = 0;
|
|
PRINT_INFO("Pending save for segment %s deactivated\n",
|
|
dev_info->segment_name);
|
|
}
|
|
} else {
|
|
up_write(&dcssblk_devices_sem);
|
|
PRINT_WARN("Invalid value, must be 0 or 1\n");
|
|
return -EINVAL;
|
|
}
|
|
up_write(&dcssblk_devices_sem);
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* device attribute for adding devices
|
|
*/
|
|
static ssize_t
|
|
dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
int rc, i;
|
|
struct dcssblk_dev_info *dev_info;
|
|
char *local_buf;
|
|
unsigned long seg_byte_size;
|
|
|
|
dev_info = NULL;
|
|
if (dev != dcssblk_root_dev) {
|
|
rc = -EINVAL;
|
|
goto out_nobuf;
|
|
}
|
|
local_buf = kmalloc(count + 1, GFP_KERNEL);
|
|
if (local_buf == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out_nobuf;
|
|
}
|
|
/*
|
|
* parse input
|
|
*/
|
|
for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) {
|
|
local_buf[i] = toupper(buf[i]);
|
|
}
|
|
local_buf[i] = '\0';
|
|
if ((i == 0) || (i > 8)) {
|
|
rc = -ENAMETOOLONG;
|
|
goto out;
|
|
}
|
|
/*
|
|
* already loaded?
|
|
*/
|
|
down_read(&dcssblk_devices_sem);
|
|
dev_info = dcssblk_get_device_by_name(local_buf);
|
|
up_read(&dcssblk_devices_sem);
|
|
if (dev_info != NULL) {
|
|
PRINT_WARN("Segment %s already loaded!\n", local_buf);
|
|
rc = -EEXIST;
|
|
goto out;
|
|
}
|
|
/*
|
|
* get a struct dcssblk_dev_info
|
|
*/
|
|
dev_info = kzalloc(sizeof(struct dcssblk_dev_info), GFP_KERNEL);
|
|
if (dev_info == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
strcpy(dev_info->segment_name, local_buf);
|
|
strlcpy(dev_info->dev.bus_id, local_buf, BUS_ID_SIZE);
|
|
dev_info->dev.release = dcssblk_release_segment;
|
|
INIT_LIST_HEAD(&dev_info->lh);
|
|
|
|
dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK);
|
|
if (dev_info->gd == NULL) {
|
|
rc = -ENOMEM;
|
|
goto free_dev_info;
|
|
}
|
|
dev_info->gd->major = dcssblk_major;
|
|
dev_info->gd->fops = &dcssblk_devops;
|
|
dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL);
|
|
dev_info->gd->queue = dev_info->dcssblk_queue;
|
|
dev_info->gd->private_data = dev_info;
|
|
dev_info->gd->driverfs_dev = &dev_info->dev;
|
|
/*
|
|
* load the segment
|
|
*/
|
|
rc = segment_load(local_buf, SEGMENT_SHARED,
|
|
&dev_info->start, &dev_info->end);
|
|
if (rc < 0) {
|
|
dcssblk_segment_warn(rc, dev_info->segment_name);
|
|
goto dealloc_gendisk;
|
|
}
|
|
seg_byte_size = (dev_info->end - dev_info->start + 1);
|
|
set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors
|
|
PRINT_INFO("Loaded segment %s, size = %lu Byte, "
|
|
"capacity = %lu (512 Byte) sectors\n", local_buf,
|
|
seg_byte_size, seg_byte_size >> 9);
|
|
|
|
dev_info->segment_type = rc;
|
|
dev_info->save_pending = 0;
|
|
dev_info->is_shared = 1;
|
|
dev_info->dev.parent = dcssblk_root_dev;
|
|
|
|
/*
|
|
* get minor, add to list
|
|
*/
|
|
down_write(&dcssblk_devices_sem);
|
|
rc = dcssblk_assign_free_minor(dev_info);
|
|
if (rc) {
|
|
up_write(&dcssblk_devices_sem);
|
|
PRINT_ERR("No free minor number available! "
|
|
"Unloading segment...\n");
|
|
goto unload_seg;
|
|
}
|
|
sprintf(dev_info->gd->disk_name, "dcssblk%d",
|
|
dev_info->gd->first_minor);
|
|
list_add_tail(&dev_info->lh, &dcssblk_devices);
|
|
|
|
if (!try_module_get(THIS_MODULE)) {
|
|
rc = -ENODEV;
|
|
goto list_del;
|
|
}
|
|
/*
|
|
* register the device
|
|
*/
|
|
rc = device_register(&dev_info->dev);
|
|
if (rc) {
|
|
PRINT_ERR("Segment %s could not be registered RC=%d\n",
|
|
local_buf, rc);
|
|
module_put(THIS_MODULE);
|
|
goto list_del;
|
|
}
|
|
get_device(&dev_info->dev);
|
|
rc = device_create_file(&dev_info->dev, &dev_attr_shared);
|
|
if (rc)
|
|
goto unregister_dev;
|
|
rc = device_create_file(&dev_info->dev, &dev_attr_save);
|
|
if (rc)
|
|
goto unregister_dev;
|
|
|
|
add_disk(dev_info->gd);
|
|
|
|
blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request);
|
|
blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096);
|
|
|
|
switch (dev_info->segment_type) {
|
|
case SEG_TYPE_SR:
|
|
case SEG_TYPE_ER:
|
|
case SEG_TYPE_SC:
|
|
set_disk_ro(dev_info->gd,1);
|
|
break;
|
|
default:
|
|
set_disk_ro(dev_info->gd,0);
|
|
break;
|
|
}
|
|
PRINT_DEBUG("Segment %s loaded successfully\n", local_buf);
|
|
up_write(&dcssblk_devices_sem);
|
|
rc = count;
|
|
goto out;
|
|
|
|
unregister_dev:
|
|
PRINT_ERR("device_create_file() failed!\n");
|
|
list_del(&dev_info->lh);
|
|
blk_cleanup_queue(dev_info->dcssblk_queue);
|
|
dev_info->gd->queue = NULL;
|
|
put_disk(dev_info->gd);
|
|
device_unregister(&dev_info->dev);
|
|
segment_unload(dev_info->segment_name);
|
|
put_device(&dev_info->dev);
|
|
up_write(&dcssblk_devices_sem);
|
|
goto out;
|
|
list_del:
|
|
list_del(&dev_info->lh);
|
|
up_write(&dcssblk_devices_sem);
|
|
unload_seg:
|
|
segment_unload(local_buf);
|
|
dealloc_gendisk:
|
|
blk_cleanup_queue(dev_info->dcssblk_queue);
|
|
dev_info->gd->queue = NULL;
|
|
put_disk(dev_info->gd);
|
|
free_dev_info:
|
|
kfree(dev_info);
|
|
out:
|
|
kfree(local_buf);
|
|
out_nobuf:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* device attribute for removing devices
|
|
*/
|
|
static ssize_t
|
|
dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
int rc, i;
|
|
char *local_buf;
|
|
|
|
if (dev != dcssblk_root_dev) {
|
|
return -EINVAL;
|
|
}
|
|
local_buf = kmalloc(count + 1, GFP_KERNEL);
|
|
if (local_buf == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
/*
|
|
* parse input
|
|
*/
|
|
for (i = 0; ((*(buf+i)!='\0') && (*(buf+i)!='\n') && i < count); i++) {
|
|
local_buf[i] = toupper(buf[i]);
|
|
}
|
|
local_buf[i] = '\0';
|
|
if ((i == 0) || (i > 8)) {
|
|
rc = -ENAMETOOLONG;
|
|
goto out_buf;
|
|
}
|
|
|
|
down_write(&dcssblk_devices_sem);
|
|
dev_info = dcssblk_get_device_by_name(local_buf);
|
|
if (dev_info == NULL) {
|
|
up_write(&dcssblk_devices_sem);
|
|
PRINT_WARN("Segment %s is not loaded!\n", local_buf);
|
|
rc = -ENODEV;
|
|
goto out_buf;
|
|
}
|
|
if (atomic_read(&dev_info->use_count) != 0) {
|
|
up_write(&dcssblk_devices_sem);
|
|
PRINT_WARN("Segment %s is in use!\n", local_buf);
|
|
rc = -EBUSY;
|
|
goto out_buf;
|
|
}
|
|
list_del(&dev_info->lh);
|
|
|
|
del_gendisk(dev_info->gd);
|
|
blk_cleanup_queue(dev_info->dcssblk_queue);
|
|
dev_info->gd->queue = NULL;
|
|
put_disk(dev_info->gd);
|
|
device_unregister(&dev_info->dev);
|
|
segment_unload(dev_info->segment_name);
|
|
PRINT_DEBUG("Segment %s unloaded successfully\n",
|
|
dev_info->segment_name);
|
|
put_device(&dev_info->dev);
|
|
up_write(&dcssblk_devices_sem);
|
|
|
|
rc = count;
|
|
out_buf:
|
|
kfree(local_buf);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
dcssblk_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
int rc;
|
|
|
|
dev_info = inode->i_bdev->bd_disk->private_data;
|
|
if (NULL == dev_info) {
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
atomic_inc(&dev_info->use_count);
|
|
inode->i_bdev->bd_block_size = 4096;
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
dcssblk_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
int rc;
|
|
|
|
dev_info = inode->i_bdev->bd_disk->private_data;
|
|
if (NULL == dev_info) {
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
down_write(&dcssblk_devices_sem);
|
|
if (atomic_dec_and_test(&dev_info->use_count)
|
|
&& (dev_info->save_pending)) {
|
|
PRINT_INFO("Segment %s became idle and is being saved now\n",
|
|
dev_info->segment_name);
|
|
segment_save(dev_info->segment_name);
|
|
dev_info->save_pending = 0;
|
|
}
|
|
up_write(&dcssblk_devices_sem);
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
dcssblk_make_request(request_queue_t *q, struct bio *bio)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
struct bio_vec *bvec;
|
|
unsigned long index;
|
|
unsigned long page_addr;
|
|
unsigned long source_addr;
|
|
unsigned long bytes_done;
|
|
int i;
|
|
|
|
bytes_done = 0;
|
|
dev_info = bio->bi_bdev->bd_disk->private_data;
|
|
if (dev_info == NULL)
|
|
goto fail;
|
|
if ((bio->bi_sector & 7) != 0 || (bio->bi_size & 4095) != 0)
|
|
/* Request is not page-aligned. */
|
|
goto fail;
|
|
if (((bio->bi_size >> 9) + bio->bi_sector)
|
|
> get_capacity(bio->bi_bdev->bd_disk)) {
|
|
/* Request beyond end of DCSS segment. */
|
|
goto fail;
|
|
}
|
|
/* verify data transfer direction */
|
|
if (dev_info->is_shared) {
|
|
switch (dev_info->segment_type) {
|
|
case SEG_TYPE_SR:
|
|
case SEG_TYPE_ER:
|
|
case SEG_TYPE_SC:
|
|
/* cannot write to these segments */
|
|
if (bio_data_dir(bio) == WRITE) {
|
|
PRINT_WARN("rejecting write to ro segment %s\n", dev_info->dev.bus_id);
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
index = (bio->bi_sector >> 3);
|
|
bio_for_each_segment(bvec, bio, i) {
|
|
page_addr = (unsigned long)
|
|
page_address(bvec->bv_page) + bvec->bv_offset;
|
|
source_addr = dev_info->start + (index<<12) + bytes_done;
|
|
if (unlikely(page_addr & 4095) != 0 || (bvec->bv_len & 4095) != 0)
|
|
// More paranoia.
|
|
goto fail;
|
|
if (bio_data_dir(bio) == READ) {
|
|
memcpy((void*)page_addr, (void*)source_addr,
|
|
bvec->bv_len);
|
|
} else {
|
|
memcpy((void*)source_addr, (void*)page_addr,
|
|
bvec->bv_len);
|
|
}
|
|
bytes_done += bvec->bv_len;
|
|
}
|
|
bio_endio(bio, bytes_done, 0);
|
|
return 0;
|
|
fail:
|
|
bio_io_error(bio, bio->bi_size);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
|
|
unsigned long *data)
|
|
{
|
|
struct dcssblk_dev_info *dev_info;
|
|
unsigned long pgoff;
|
|
|
|
dev_info = bdev->bd_disk->private_data;
|
|
if (!dev_info)
|
|
return -ENODEV;
|
|
if (secnum % (PAGE_SIZE/512))
|
|
return -EINVAL;
|
|
pgoff = secnum / (PAGE_SIZE / 512);
|
|
if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start)
|
|
return -ERANGE;
|
|
*data = (unsigned long) (dev_info->start+pgoff*PAGE_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
dcssblk_check_params(void)
|
|
{
|
|
int rc, i, j, k;
|
|
char buf[9];
|
|
struct dcssblk_dev_info *dev_info;
|
|
|
|
for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0');
|
|
i++) {
|
|
for (j = i; (dcssblk_segments[j] != ',') &&
|
|
(dcssblk_segments[j] != '\0') &&
|
|
(dcssblk_segments[j] != '(') &&
|
|
(j - i) < 8; j++)
|
|
{
|
|
buf[j-i] = dcssblk_segments[j];
|
|
}
|
|
buf[j-i] = '\0';
|
|
rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i);
|
|
if ((rc >= 0) && (dcssblk_segments[j] == '(')) {
|
|
for (k = 0; buf[k] != '\0'; k++)
|
|
buf[k] = toupper(buf[k]);
|
|
if (!strncmp(&dcssblk_segments[j], "(local)", 7)) {
|
|
down_read(&dcssblk_devices_sem);
|
|
dev_info = dcssblk_get_device_by_name(buf);
|
|
up_read(&dcssblk_devices_sem);
|
|
if (dev_info)
|
|
dcssblk_shared_store(&dev_info->dev,
|
|
NULL, "0\n", 2);
|
|
}
|
|
}
|
|
while ((dcssblk_segments[j] != ',') &&
|
|
(dcssblk_segments[j] != '\0'))
|
|
{
|
|
j++;
|
|
}
|
|
if (dcssblk_segments[j] == '\0')
|
|
break;
|
|
i = j;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The init/exit functions.
|
|
*/
|
|
static void __exit
|
|
dcssblk_exit(void)
|
|
{
|
|
int rc;
|
|
|
|
PRINT_DEBUG("DCSSBLOCK EXIT...\n");
|
|
s390_root_dev_unregister(dcssblk_root_dev);
|
|
rc = unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
|
|
if (rc) {
|
|
PRINT_ERR("unregister_blkdev() failed!\n");
|
|
}
|
|
PRINT_DEBUG("...finished!\n");
|
|
}
|
|
|
|
static int __init
|
|
dcssblk_init(void)
|
|
{
|
|
int rc;
|
|
|
|
PRINT_DEBUG("DCSSBLOCK INIT...\n");
|
|
dcssblk_root_dev = s390_root_dev_register("dcssblk");
|
|
if (IS_ERR(dcssblk_root_dev)) {
|
|
PRINT_ERR("device_register() failed!\n");
|
|
return PTR_ERR(dcssblk_root_dev);
|
|
}
|
|
rc = device_create_file(dcssblk_root_dev, &dev_attr_add);
|
|
if (rc) {
|
|
PRINT_ERR("device_create_file(add) failed!\n");
|
|
s390_root_dev_unregister(dcssblk_root_dev);
|
|
return rc;
|
|
}
|
|
rc = device_create_file(dcssblk_root_dev, &dev_attr_remove);
|
|
if (rc) {
|
|
PRINT_ERR("device_create_file(remove) failed!\n");
|
|
s390_root_dev_unregister(dcssblk_root_dev);
|
|
return rc;
|
|
}
|
|
rc = register_blkdev(0, DCSSBLK_NAME);
|
|
if (rc < 0) {
|
|
PRINT_ERR("Can't get dynamic major!\n");
|
|
s390_root_dev_unregister(dcssblk_root_dev);
|
|
return rc;
|
|
}
|
|
dcssblk_major = rc;
|
|
init_rwsem(&dcssblk_devices_sem);
|
|
|
|
dcssblk_check_params();
|
|
|
|
PRINT_DEBUG("...finished!\n");
|
|
return 0;
|
|
}
|
|
|
|
module_init(dcssblk_init);
|
|
module_exit(dcssblk_exit);
|
|
|
|
module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444);
|
|
MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, "
|
|
"comma-separated list, each name max. 8 chars.\n"
|
|
"Adding \"(local)\" to segment name equals echoing 0 to "
|
|
"/sys/devices/dcssblk/<segment name>/shared after loading "
|
|
"the segment - \n"
|
|
"e.g. segments=\"mydcss1,mydcss2,mydcss3(local)\"");
|
|
|
|
MODULE_LICENSE("GPL");
|