File: [Development] / linux-2.4-xfs / drivers / ide / raid / medley.c (download)
Revision 1.2, Mon Apr 19 11:06:40 2004 UTC (13 years, 6 months ago) by nathans
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +0 -752
lines
Fix up merge - an over-eager script seems to have patched some files twice..
|
/*
* MEDLEY SOFTWARE RAID DRIVER (Silicon Image 3112 and others)
*
* Copyright (C) 2003 Thomas Horsten <thomas@horsten.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* Copyright (C) 2003 Thomas Horsten <thomas@horsten.com>
* All Rights Reserved.
*
* This driver uses the ATA RAID driver framework and is based on
* code from Arjan van de Ven's silraid.c and hptraid.c.
*
* It is a driver for the Medley software RAID, which is used by
* some IDE controllers, including the Silicon Image 3112 SATA
* controller found onboard many modern motherboards, and the
* CMD680 stand-alone PCI RAID controller.
*
* The author has only tested this on the Silicon Image SiI3112.
* If you have any luck using more than 2 drives, and/or more
* than one RAID set, and/or any other chip than the SiI3112,
* please let me know by sending me mail at the above address.
*
* Currently, only striped mode is supported for these RAIDs.
*
* You are welcome to contact me if you have any questions or
* suggestions for improvement.
*
* Change history:
*
* 20040310 - thomas@horsten.com
* Removed C99 style variable declarations that confused gcc-2.x
* Fixed a bug where more than one RAID set would not be detected correctly
* General cleanup for submission to kernel
*
* 20031012 - thomas@horsten.com
* Added support for BLKRRPART ioctl to re-read partition table
*
* 20030801 - thomas@horsten.com
* First test release
*
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/genhd.h>
#include <linux/ioctl.h>
#include <linux/ide.h>
#include <asm/uaccess.h>
#include "ataraid.h"
/*
* These options can be tuned if the need should occur.
*
* Even better, this driver could be changed to allocate the structures
* dynamically.
*/
#define MAX_DRIVES_PER_SET 8
#define MAX_MEDLEY_ARRAYS 4
/*
* Set to 1 only if you are debugging the driver, or if it doesn't work
* the way you expect and you want to to report it.
*
* This will produce lots of kernel messages, some of which might
* help me figure out what is going wrong).
*/
#define DEBUGGING_MEDLEY 0
#if DEBUGGING_MEDLEY
#define dprintk(fmt, args...) printk(fmt, ##args)
#else
#define dprintk(fmt, args...)
#endif
/*
* Medley RAID metadata structure.
*
* The metadata structure is based on the ATA drive ID from the drive itself,
* with the RAID information in the vendor specific regions.
*
* We do not use all the fields, since we only support Striped Sets.
*/
struct medley_metadata {
u8 driveid0[46];
u8 ascii_version[8];
u8 driveid1[52];
u32 total_sectors_low;
u32 total_sectors_high;
u16 reserved0;
u8 driveid2[142];
u16 product_id;
u16 vendor_id;
u16 minor_ver;
u16 major_ver;
u16 creation_timestamp[3];
u16 chunk_size;
u16 reserved1;
u8 drive_number;
u8 raid_type;
u8 drives_per_striped_set;
u8 striped_set_number;
u8 drives_per_mirrored_set;
u8 mirrored_set_number;
u32 rebuild_ptr_low;
u32 rebuild_ptr_high;
u32 incarnation_no;
u8 member_status;
u8 mirrored_set_state;
u8 reported_device_location;
u8 member_location;
u8 auto_rebuild;
u8 reserved3[17];
u16 checksum;
};
/*
* This struct holds the information about a Medley array
*/
struct medley_array {
u8 drives;
u16 chunk_size;
u32 sectors_per_row;
u8 chunk_size_log;
u16 present;
u16 timestamp[3];
u32 sectors;
int registered;
atomic_t valid;
int access;
kdev_t members[MAX_DRIVES_PER_SET];
struct block_device *bdev[MAX_DRIVES_PER_SET];
};
static struct medley_array raid[MAX_MEDLEY_ARRAYS];
/*
* Here we keep the offset of the ATARAID device ID's compared to our
* own (this will normally be 0, unless another ATARAID driver has
* registered some arrays before us).
*/
static int medley_devid_offset = 0;
/*
* This holds the number of detected arrays.
*/
static int medley_arrays = 0;
/*
* Wait queue for opening device (used when re-reading partition table)
*/
static DECLARE_WAIT_QUEUE_HEAD(medley_wait_open);
/*
* The interface functions used by the ataraid framework.
*/
static int medley_open(struct inode *inode, struct file *filp);
static int medley_release(struct inode *inode, struct file *filp);
static int medley_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static int medley_make_request(request_queue_t * q, int rw,
struct buffer_head *bh);
static struct raid_device_operations medley_ops = {
open: medley_open,
release: medley_release,
ioctl: medley_ioctl,
make_request: medley_make_request
};
/*
* This is the list of devices to probe.
*/
static const kdev_t probelist[] = {
MKDEV(IDE0_MAJOR, 0),
MKDEV(IDE0_MAJOR, 64),
MKDEV(IDE1_MAJOR, 0),
MKDEV(IDE1_MAJOR, 64),
MKDEV(IDE2_MAJOR, 0),
MKDEV(IDE2_MAJOR, 64),
MKDEV(IDE3_MAJOR, 0),
MKDEV(IDE3_MAJOR, 64),
MKDEV(IDE4_MAJOR, 0),
MKDEV(IDE4_MAJOR, 64),
MKDEV(IDE5_MAJOR, 0),
MKDEV(IDE5_MAJOR, 64),
MKDEV(IDE6_MAJOR, 0),
MKDEV(IDE6_MAJOR, 64),
MKDEV(0, 0)
};
/*
* Handler for ioctl calls to the virtual device
*/
static int medley_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned int minor;
unsigned long sectors;
int devminor = (inode->i_rdev >> SHIFT) & MAJOR_MASK;
int device = devminor - medley_devid_offset;
int partition;
dprintk("medley_ioctl\n");
minor = MINOR(inode->i_rdev) >> SHIFT;
switch (cmd) {
case BLKGETSIZE: /* Return device size */
if (!arg)
return -EINVAL;
sectors =
ataraid_gendisk.part[MINOR(inode->i_rdev)].nr_sects;
dprintk("medley_ioctl: BLKGETSIZE\n");
if (MINOR(inode->i_rdev) & 15)
return put_user(sectors, (unsigned long *) arg);
return put_user(raid[minor - medley_devid_offset].sectors,
(unsigned long *) arg);
break;
case HDIO_GETGEO: {
struct hd_geometry *loc =
(struct hd_geometry *) arg;
unsigned short bios_cyl = (unsigned short)
(raid[minor].sectors / 255 / 63); /* truncate */
dprintk("medley_ioctl: HDIO_GETGEO\n");
if (!loc)
return -EINVAL;
if (put_user(255, (byte *) & loc->heads))
return -EFAULT;
if (put_user(63, (byte *) & loc->sectors))
return -EFAULT;
if (put_user
(bios_cyl, (unsigned short *) &loc->cylinders))
return -EFAULT;
if (put_user
((unsigned) ataraid_gendisk.
part[MINOR(inode->i_rdev)].start_sect,
(unsigned long *) &loc->start))
return -EFAULT;
return 0;
}
case HDIO_GETGEO_BIG: {
struct hd_big_geometry *loc =
(struct hd_big_geometry *) arg;
dprintk("medley_ioctl: HDIO_GETGEO_BIG\n");
if (!loc)
return -EINVAL;
if (put_user(255, (byte *) & loc->heads))
return -EFAULT;
if (put_user(63, (byte *) & loc->sectors))
return -EFAULT;
if (put_user
(raid[minor - medley_devid_offset].sectors /
255 / 63, (unsigned int *) &loc->cylinders))
return -EFAULT;
if (put_user
((unsigned) ataraid_gendisk.
part[MINOR(inode->i_rdev)].start_sect,
(unsigned long *) &loc->start))
return -EFAULT;
return 0;
}
case BLKROSET:
case BLKROGET:
case BLKSSZGET:
dprintk("medley_ioctl: BLK*\n");
return blk_ioctl(inode->i_rdev, cmd, arg);
case BLKRRPART: /* Re-read partition tables */
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (minor != 0)
return -EINVAL;
if (atomic_read(&(raid[device].valid)) == 0)
return -EINVAL;
atomic_set(&(raid[device].valid), 0);
if (raid[device].access != 1) {
atomic_set(&(raid[device].valid), 1);
return -EBUSY;
}
for (partition = 15; partition >= 0; partition--) {
invalidate_device(MKDEV(ATARAID_MAJOR,
partition + devminor), 1);
ataraid_gendisk.part[partition +
devminor].start_sect = 0;
ataraid_gendisk.part[partition +
devminor].nr_sects = 0;
}
ataraid_register_disk(device, raid[device].sectors);
atomic_set(&(raid[device].valid), 1);
wake_up(&medley_wait_open);
return 0;
default:
return -EINVAL;
}
return 0;
}
/*
* Handler to map a request to the real device.
* If the request cannot be made because it spans multiple disks,
* we return -1, otherwise we modify the request and return 1.
*/
static int medley_make_request(request_queue_t * q, int rw,
struct buffer_head *bh)
{
u8 disk;
u32 rsect = bh->b_rsector;
int device =
((bh->b_rdev >> SHIFT) & MAJOR_MASK) - medley_devid_offset;
struct medley_array *r = raid + device;
/* Add the partition offset */
rsect = rsect + ataraid_gendisk.part[MINOR(bh->b_rdev)].start_sect;
dprintk("medley_make_request, rsect=%ul\n", rsect);
/* Detect if the request crosses a chunk barrier */
if (r->chunk_size_log) {
if (((rsect & (r->chunk_size - 1)) +
(bh->b_size / 512)) > (1 << r->chunk_size_log)) {
return -1;
}
} else {
if ((rsect / r->chunk_size) !=
((rsect + (bh->b_size / 512) - 1) / r->chunk_size)) {
return -1;
}
}
/*
* Medley arrays are simple enough, since the smallest disk decides the
* number of sectors used per disk. So there is no need for the cutoff
* magic found in other drivers like hptraid.
*/
if (r->chunk_size_log) {
/* We save some expensive operations (1 div, 1 mul, 1 mod),
* if the chunk size is a power of 2, which is true in most
* cases (at least with my version of the RAID BIOS).
*/
disk = (rsect >> r->chunk_size_log) % r->drives;
rsect = ((rsect / r->sectors_per_row) <<
r->chunk_size_log) + (rsect & (r->chunk_size -
1));
} else {
disk = (rsect / r->chunk_size) % r->drives;
rsect = rsect / r->sectors_per_row * r->chunk_size +
rsect % r->chunk_size;
}
dprintk("medley_make_request :-), disk=%d, rsect=%ul\n", disk,
rsect);
bh->b_rdev = r->members[disk];
bh->b_rsector = rsect;
return 1;
}
/*
* Find out which array a drive belongs to, and add it to that array.
* If it is not a member of a detected array, add a new array for it.
*/
void medley_add_raiddrive(kdev_t dev, struct medley_metadata *md)
{
int c;
dprintk("Candidate drive %02x:%02x - drive %d of %d, stride %d, "
"sectors %ul (%d MB)\n",
MAJOR(dev), MINOR(dev), md->drive_number,
md->drives_per_striped_set, md->chunk_size,
md->total_sectors_low,
md->total_sectors_low / 1024 / 1024 / 2);
for (c = 0; c < medley_arrays; c++) {
if ((raid[c].timestamp[0] == md->creation_timestamp[0]) &&
(raid[c].timestamp[1] == md->creation_timestamp[1]) &&
(raid[c].timestamp[2] == md->creation_timestamp[2]) &&
(raid[c].drives == md->drives_per_striped_set) &&
(raid[c].chunk_size == md->chunk_size) &&
((raid[c].present & (1 << md->drive_number)) == 0)) {
dprintk("Existing array %d\n", c);
raid[c].present |= (1 << md->drive_number);
raid[c].members[md->drive_number] = dev;
break;
}
}
if (c == medley_arrays) {
dprintk("New array %d\n", medley_arrays);
if (medley_arrays == MAX_MEDLEY_ARRAYS) {
printk(KERN_ERR "Medley RAID: "
"Too many RAID sets detected - you can change "
"the max in the driver.\n");
} else {
raid[c].timestamp[0] = md->creation_timestamp[0];
raid[c].timestamp[1] = md->creation_timestamp[1];
raid[c].timestamp[2] = md->creation_timestamp[2];
raid[c].drives = md->drives_per_striped_set;
raid[c].chunk_size = md->chunk_size;
raid[c].sectors_per_row = md->chunk_size *
md->drives_per_striped_set;
/* Speedup if chunk size is a power of 2 */
if (((raid[c].chunk_size - 1) &
(raid[c].chunk_size)) == 0) {
raid[c].chunk_size_log =
ffs(raid[c].chunk_size) - 1;
} else {
raid[c].chunk_size_log = 0;
}
raid[c].present = (1 << md->drive_number);
raid[c].members[md->drive_number] = dev;
if (md->major_ver == 1) {
raid[c].sectors = ((u32 *) (md))[27];
} else {
raid[c].sectors = md->total_sectors_low;
}
medley_arrays++;
}
}
}
/*
* Read the Medley metadata from a drive.
* Returns the bh if it was found, otherwise NULL.
*/
struct buffer_head *medley_get_metadata(kdev_t dev)
{
struct buffer_head *bh = NULL;
struct pci_dev *pcidev;
u32 lba;
int pos;
struct medley_metadata *md;
ide_drive_t *drvinfo = ide_info_ptr(dev, 0);
if ((drvinfo == NULL) || drvinfo->capacity < 1) {
return NULL;
}
dprintk("Probing %02x:%02x\n", MAJOR(dev), MINOR(dev));
/* If this drive is not on a PCI controller, it is not Medley RAID.
* Medley matches the PCI device ID with the metadata to check if
* it is valid. Unfortunately it is the only reliable way to identify
* the superblock */
pcidev = drvinfo->hwif ? drvinfo->hwif->pci_dev : NULL;
if (!pcidev) {
return NULL;
}
/*
* 4 copies of the metadata exist, in the following 4 sectors:
* last, last-0x200, last-0x400, last-0x600.
*
* We must try each of these in order, until we find the metadata.
* FIXME: This does not take into account drives with 48/64-bit LBA
* addressing, even though the Medley RAID version 2 supports these.
*/
lba = drvinfo->capacity - 1;
for (pos = 0; pos < 4; pos++, lba -= 0x200) {
bh = bread(dev, lba, 512);
if (!bh) {
printk(KERN_ERR "Medley RAID (%02x:%02x): "
"Error reading metadata (lba=%d)\n",
MAJOR(dev), MINOR(dev), lba);
break;
}
/* A valid Medley RAID has the PCI vendor/device ID of its
* IDE controller, and the correct checksum. */
md = (void *) (bh->b_data);
if (pcidev->vendor == md->vendor_id &&
pcidev->device == md->product_id) {
u16 checksum = 0;
u16 *p = (void *) (bh->b_data);
int c;
for (c = 0; c < 160; c++) {
checksum += *p++;
}
dprintk
("Probing %02x:%02x csum=%d, major_ver=%d\n",
MAJOR(dev), MINOR(dev), checksum,
md->major_ver);
if (((checksum == 0xffff) && (md->major_ver == 1))
|| (checksum == 0)) {
dprintk("Probing %02x:%02x VALID\n",
MAJOR(dev), MINOR(dev));
break;
}
}
/* Was not a valid superblock */
if (bh) {
brelse(bh);
bh = NULL;
}
}
return bh;
}
/*
* Determine if this drive belongs to a Medley array.
*/
static void medley_probe_drive(int major, int minor)
{
struct buffer_head *bh;
kdev_t dev = MKDEV(major, minor);
struct medley_metadata *md;
bh = medley_get_metadata(dev);
if (!bh)
return;
md = (void *) (bh->b_data);
if (md->raid_type != 0x0) {
printk(KERN_INFO "Medley RAID (%02x:%02x): "
"Sorry, this driver currently only supports "
"striped sets (RAID level 0).\n", major, minor);
} else if (md->major_ver == 2 && md->total_sectors_high != 0) {
printk(KERN_ERR "Medley RAID (%02x:%02x):"
"Sorry, the driver only supports 32 bit LBA disks "
"(disk too big).\n", major, minor);
} else if (md->major_ver > 0 && md->major_ver > 2) {
printk(KERN_INFO "Medley RAID (%02x:%02x): "
"Unsupported version (%d.%d) - this driver supports "
"Medley version 1.x and 2.x\n",
major, minor, md->major_ver, md->minor_ver);
} else if (md->drives_per_striped_set > MAX_DRIVES_PER_SET) {
printk(KERN_ERR "Medley RAID (%02x:%02x): "
"Striped set too large (%d drives) - please report "
"this (and change max in driver).\n",
major, minor, md->drives_per_striped_set);
} else if ((md->drive_number > md->drives_per_striped_set) ||
(md->drives_per_striped_set < 1) ||
(md->chunk_size < 1)) {
printk(KERN_ERR "Medley RAID (%02x:%02x): "
"Metadata appears to be corrupt.\n", major, minor);
} else {
/* We have a good candidate, put it in the correct array */
medley_add_raiddrive(dev, md);
}
if (bh) {
brelse(bh);
}
}
/*
* Taken from hptraid.c, this is called to prevent the device
* from disappearing from under us and also nullifies the (incorrect)
* partitions of the underlying disk.
*/
struct block_device *get_device_lock(kdev_t member)
{
struct block_device *bdev = bdget(member);
struct gendisk *gd;
int minor = MINOR(member);
int j;
if (bdev
&& blkdev_get(bdev, FMODE_READ | FMODE_WRITE, 0,
BDEV_RAW) == 0) {
/*
* This is supposed to prevent others from
* stealing our underlying disks. Now blank
* the /proc/partitions table for the wrong
* partition table, so that scripts don't
* accidentally mount it and crash the kernel
*/
/* XXX: the 0 is an utter hack --hch */
gd = get_gendisk(MKDEV(MAJOR(member), 0));
if (gd != NULL) {
if (gd->major == MAJOR(member)) {
for (j = 1 + (minor << gd->minor_shift);
j < ((minor + 1) << gd->minor_shift);
j++)
gd->part[j].nr_sects = 0;
}
}
}
return bdev;
}
/*
* Initialise the driver.
*/
static __init int medley_init(void)
{
int c, d;
memset(raid, 0, MAX_MEDLEY_ARRAYS * sizeof(struct medley_array));
/* Probe each of the drives on our list */
for (c = 0; probelist[c] != MKDEV(0, 0); c++) {
medley_probe_drive(MAJOR(probelist[c]),
MINOR(probelist[c]));
}
/* Check if the detected sets are complete */
for (c = 0; c < medley_arrays; c++) {
if (raid[c].present != (1 << raid[c].drives) - 1) {
printk(KERN_ERR "Medley RAID: "
"Incomplete RAID set deleted - disks:");
for (d = 0; c < raid[c].drives; c++) {
if (raid[c].present & (1 << d)) {
printk(" %02x:%02x",
MAJOR(raid[c].members[d]),
MINOR(raid[c].members[d]));
}
}
printk("\n");
if (c + 1 < medley_arrays) {
memmove(raid + c + 1, raid + c,
(medley_arrays - c -
1) * sizeof(struct medley_array));
}
medley_arrays--;
}
}
/* Register any remaining array(s) */
for (c = 0; c < medley_arrays; c++) {
int device = ataraid_get_device(&medley_ops);
if (device < 0) {
printk(KERN_ERR "Medley RAID: "
"Could not get ATARAID device.\n");
break;
}
if (c == 0) {
/* First array, compute offset to our device ID's */
medley_devid_offset = device;
dprintk("Medley_devid_offset: %d\n",
medley_devid_offset);
} else if (device - medley_devid_offset != c) {
printk(KERN_ERR "Medley RAID: "
"ATARAID gave us an illegal device ID.\n");
ataraid_release_device(device);
break;
}
printk(KERN_INFO "Medley RAID: "
"Striped set %d consists of %d disks, total %dMiB "
"- disks:",
c, raid[c].drives,
raid[c].sectors / 1024 / 1024 / 2);
for (d = 0; d < raid[c].drives; d++) {
printk(" %02x:%02x", MAJOR(raid[c].members[d]),
MINOR(raid[c].members[d]));
raid[c].bdev[d] = get_device_lock(raid[c].members[d]);
}
printk("\n");
raid[c].registered = 1;
atomic_set(&(raid[c].valid), 1);
ataraid_register_disk(c, raid[c].sectors);
}
if (medley_arrays > 0) {
printk(KERN_INFO "Medley RAID: %d active RAID set%s\n",
medley_arrays, medley_arrays == 1 ? "" : "s");
return 0;
}
printk(KERN_INFO "Medley RAID: No usable RAID sets found\n");
return -ENODEV;
}
/*
* Remove the arrays and clean up.
*/
static void __exit medley_exit(void)
{
int device, d;
for (device = 0; device < medley_arrays; device++) {
for (d = 0; d < raid[device].drives; d++) {
if (raid[device].bdev[d]) {
blkdev_put(raid[device].bdev[d], BDEV_RAW);
raid[device].bdev[d] = NULL;
}
}
if (raid[device].registered) {
ataraid_release_device(device +
medley_devid_offset);
raid[device].registered = 0;
}
}
}
/*
* Called to open the virtual device
*/
static int medley_open(struct inode *inode, struct file *filp)
{
int device = ((inode->i_rdev >> SHIFT) & MAJOR_MASK) -
medley_devid_offset;
dprintk("medley_open\n");
if (device < medley_arrays) {
while (!atomic_read(&(raid[device].valid)))
sleep_on(&medley_wait_open);
raid[device].access++;
MOD_INC_USE_COUNT;
return (0);
}
return -ENODEV;
}
/*
* Called to release the handle on the virtual device
*/
static int medley_release(struct inode *inode, struct file *filp)
{
int device = ((inode->i_rdev >> SHIFT) & MAJOR_MASK) -
medley_devid_offset;
dprintk("medley_release\n");
raid[device].access--;
MOD_DEC_USE_COUNT;
return 0;
}
module_init(medley_init);
module_exit(medley_exit);
MODULE_LICENSE("GPL");
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