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/******************************************************************************
* xenolinux_block_test.c
*
*/
#define EXPORT_SYMTAB
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <asm/hypervisor-ifs/block.h>
#include <asm/hypervisor-ifs/hypervisor-if.h>
/******************************************************************/
static struct proc_dir_entry *bdt;
static blk_ring_req_entry_t meta;
static char * data;
static int proc_read_bdt(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
switch (meta.operation)
{
case XEN_BLOCK_READ :
case XEN_BLOCK_WRITE :
{
return proc_dump_block(page, start, off, count, eof, data);
}
case XEN_BLOCK_DEBUG :
{
return proc_dump_debug(page, start, off, count, eof, data);
}
default :
{
printk(KERN_ALERT
"block device test error: unknown operation [%c]\n",
meta.operation);
return -EINVAL;
}
}
}
int proc_dump_debug(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char header[100];
char dump[1024];
sprintf (header, "Block Device Test: Debug Dump\n\n");
sprintf (dump, "%s\n", meta.buffer);
if (data)
{
kfree(data);
}
strncpy (page, dump, count);
return strlen(page);
}
int proc_dump_block(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char header[100];
char dump[1024];
char temp[100];
int loop;
sprintf (header, "Block Device Test\n\n%s blk num: %ld 0x%lx; size: %d 0x%x; device: 0x%x\n",
meta.operation == XEN_BLOCK_WRITE ? "write" : "read",
meta.block_number, meta.block_number,
meta.block_size, meta.block_size,
meta.device);
sprintf (dump, "%s", header);
if (meta.buffer)
{
for (loop = 0; loop < 100; loop++)
{
int i = meta.buffer[loop];
if (loop % 8 == 0)
{
sprintf (temp, "[%2d] ", loop);
strcat(dump, temp);
}
else if (loop % 2 == 0)
{
strcat(dump, " ");
}
sprintf (temp, " 0x%02x", i & 255);
strcat(dump, temp);
if ((loop + 1) % 8 == 0)
{
strcat(dump, "\n");
}
}
strcat(dump, "\n\n");
}
if (data)
{
kfree(data);
}
strncpy (page, dump, count);
return strlen(page);
}
int proc_write_bdt(struct file *file, const char *buffer,
unsigned long count, void *data)
{
char *local = kmalloc((count + 1) * sizeof(char), GFP_KERNEL);
char opcode;
int block_number = 0;
int block_size = 0;
int device = 0;
if (copy_from_user(local, buffer, count))
{
return -EFAULT;
}
local[count] = '\0';
sscanf(local, "%c %i %i %i",
&opcode, &block_number, &block_size, &device);
if (opcode == 'r' || opcode == 'R')
{
meta.operation = XEN_BLOCK_READ;
}
else if (opcode == 'w' || opcode == 'W')
{
meta.operation = XEN_BLOCK_WRITE;
}
else if (opcode == 'd' || opcode == 'D')
{
meta.operation = XEN_BLOCK_DEBUG;
block_size = 10000;
}
else
{
printk(KERN_ALERT
"block device test error: unknown opcode [%c]\n", opcode);
return -EINVAL;
}
if (data)
{
kfree(data);
}
data = kmalloc(block_size * sizeof(char), GFP_KERNEL);
if (data == NULL)
{
kfree(local);
return -ENOMEM;
}
meta.block_number = block_number;
meta.block_size = block_size;
meta.device = device;
meta.buffer = data;
/* submit request */
hypervisor_request(0, meta.operation, meta.buffer,
meta.block_number, meta.block_size,
meta.device);
HYPERVISOR_block_io_op();
mdelay(1000); /* should wait for a proper acknowledgement/response. */
kfree(local);
return count;
}
static int __init init_module(void)
{
int return_value = 0;
/* create proc entry */
bdt = create_proc_entry("bdt", 0644, NULL);
if (bdt == NULL)
{
return_value = -ENOMEM;
goto error;
}
bdt->data = NULL;
bdt->read_proc = proc_read_bdt;
bdt->write_proc = proc_write_bdt;
bdt->owner = THIS_MODULE;
memset(&meta, 0, sizeof(meta));
/* success */
printk(KERN_ALERT "XenoLinux Block Device Test installed\n");
return 0;
error:
return return_value;
}
static void __exit cleanup_module(void)
{
if (data)
{
kfree(data);
}
printk(KERN_ALERT "XenoLinux Block Device Test uninstalled\n");
}
module_init(init_module);
module_exit(cleanup_module);
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