Re: db_file_mutliblock_read_count and physical IO
- From: Mladen Gogala <gogala@xxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 18 Aug 2004 22:41:16 -0400
On 08/18/2004 12:58:40 PM, Cary Millsap wrote:
> In a sit-down I had with Steve Adams once, he told me that many (if not =
> all)
> Unix device drivers don't do multi-block fetches even on multi-block I/O
> calls. He said that there's actually a rotational latency between =
> adjacent
> blocks in a multi-block OS read call (just not a context switch, which =
> is
> why an n-block read is still better than n 1-block reads). If this is =
> true,
> it would matter less that the Oracle kernel "reads around" blocks that =
> are
> already in the buffer cache.
This is not exactly true. Example and explanation are below. I apologize in
advance for sightly longer post. The post includes ide-disk.c, the source code
for the Linux kernel 2.4.27 IDE disk driver in its entirety, with the
explanation
how multi-block request is handled. Please, stop reading now if you don't like
big C
language programs. Explanations that I wanted to make are marked with my name.
Steve's
explanation is almost correct. Almost, but not completely.
>
> But, since I/O processing is the root cause of far fewer Oracle =
> performance
> problems tan most people think, it doesn't matter that much anyway.
I agree completely with this. The main problem is that far too many blocks
are being processed, due to bad SQL and/or design decisions.
*** Multi-block disk I/O, Linux 2.4.27, ide-disk.c ****
--------------------------------------------------------
/*
* linux/drivers/ide/ide-disk.c Version 1.18 Mar 05, 2003
*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyright (C) 1998-2002 Linux ATA Developemt
* Andre Hedrick <andre@xxxxxxxxxxxxx>
* Copyright (C) 2003 Red Hat <alan@xxxxxxxxxx>
*
*
*/
/*
* Mostly written by Mark Lord <mlord@xxxxxxxxx>
* and Gadi Oxman <gadio@xxxxxxxxxxxxxxxx>
* and Andre Hedrick <andre@xxxxxxxxxxxxx>
*
* This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
*
* Version 1.00 move disk only code from ide.c to ide-disk.c
* support optional byte-swapping of all data
* Version 1.01 fix previous byte-swapping code
* Version 1.02 remove ", LBA" from drive identification msgs
* Version 1.03 fix display of id->buf_size for big-endian
* Version 1.04 add /proc configurable settings and S.M.A.R.T support
* Version 1.05 add capacity support for ATA3 >= 8GB
* Version 1.06 get boot-up messages to show full cyl count
* Version 1.07 disable door-locking if it fails
* Version 1.08 fixed CHS/LBA translations for ATA4 > 8GB,
* process of adding new ATA4 compliance.
* fixed problems in allowing fdisk to see
* the entire disk.
* Version 1.09 added increment of rq->sector in ide_multwrite
* added UDMA 3/4 reporting
* Version 1.10 request queue changes, Ultra DMA 100
* Version 1.11 added 48-bit lba
* Version 1.12 adding taskfile io access method
* Version 1.13 added standby and flush-cache for notifier
* Version 1.14 added acoustic-wcache
* Version 1.15 convert all calls to ide_raw_taskfile
* since args will return register content.
* Version 1.16 added suspend-resume-checkpower
* Version 1.17 do flush on standy, do flush on ATA < ATA6
* fix wcache setup.
*/
#define IDEDISK_VERSION "1.17"
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/delay.h>
#define _IDE_DISK
#include <linux/ide.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
/* FIXME: some day we shouldnt need to look in here! */
#include "legacy/pdc4030.h"
static int driver_blocked;
static inline u32 idedisk_read_24 (ide_drive_t *drive)
{
#if 0
return (HWIF(drive)->INB(IDE_HCYL_REG)<<16) |
(HWIF(drive)->INB(IDE_LCYL_REG)<<8) |
HWIF(drive)->INB(IDE_SECTOR_REG);
#else
u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
return (hcyl<<16)|(lcyl<<8)|sect;
#endif
}
static int idedisk_end_request(ide_drive_t *drive, int uptodate);
/*
* lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
* value for this drive (from its reported identification information).
*
* Returns: 1 if lba_capacity looks sensible
* 0 otherwise
*
* It is called only once for each drive.
*/
static int lba_capacity_is_ok (struct hd_driveid *id)
{
unsigned long lba_sects, chs_sects, head, tail;
if ((id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)) {
printk("48-bit Drive: %llu \n", id->lba_capacity_2);
return 1;
}
/*
* The ATA spec tells large drives to return
* C/H/S = 16383/16/63 independent of their size.
* Some drives can be jumpered to use 15 heads instead of 16.
* Some drives can be jumpered to use 4092 cyls instead of 16383.
*/
if ((id->cyls == 16383
|| (id->cyls == 4092 && id->cur_cyls == 16383)) &&
id->sectors == 63 &&
(id->heads == 15 || id->heads == 16) &&
(id->lba_capacity >= 16383*63*id->heads))
return 1;
lba_sects = id->lba_capacity;
chs_sects = id->cyls * id->heads * id->sectors;
/* perform a rough sanity check on lba_sects: within 10% is OK */
if ((lba_sects - chs_sects) < chs_sects/10)
return 1;
/* some drives have the word order reversed */
head = ((lba_sects >> 16) & 0xffff);
tail = (lba_sects & 0xffff);
lba_sects = (head | (tail << 16));
if ((lba_sects - chs_sects) < chs_sects/10) {
id->lba_capacity = lba_sects;
return 1; /* lba_capacity is (now) good */
}
return 0; /* lba_capacity value may be bad */
}
#ifndef CONFIG_IDE_TASKFILE_IO
/*
* read_intr() is the handler for disk read/multread interrupts
*/
static ide_startstop_t read_intr (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
/* Mladen Gogala: msect is intialized on the line below. */
u32 i = 0, nsect = 0, msect = drive->mult_count;
struct request *rq;
unsigned long flags;
u8 stat;
char *to;
/* new way for dealing with premature shared PCI interrupts */
if (!OK_STAT(stat=hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
if (stat & (ERR_STAT|DRQ_STAT)) {
return DRIVER(drive)->error(drive, "read_intr", stat);
}
/* no data yet, so wait for another interrupt */
ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
return ide_started;
}
read_next:
rq = HWGROUP(drive)->rq;
/******************* pointed out by Mladen Gogala
******************************************/
if (msect) {
if ((nsect = rq->current_nr_sectors) > msect)
nsect = msect;
msect -= nsect;
} else
nsect = 1;
/*******************************************************************************************/
/* Mladen Gogala:
The "msect" variable is initialized to the "disk multiblock read" when the
disk is
initialized. It is so-called "multicount", visible below in the "hdparm"
listing. That
means that drivers do not do "block-by-block", but that disks have sot of
"multiblock
read count, the same as databases do. Here is "hdparm" listing:
/dev/hdd:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 14593/255/63, sectors = 234441648, start = 0
$
This means that for this particular disk drive, driver can read/write 16
sectors at
a time. In practice, that is 16*0.5=8KB, which amounts to two FS blocks or 1
oracle
block. Of course, contrloller HW can do further optimizations. It usually does
so
on SCSI controllers, but not on IDE controllers.
*************************************************************************************/
to = ide_map_buffer(rq, &flags);
taskfile_input_data(drive, to, nsect * SECTOR_WORDS);
#ifdef DEBUG
printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
drive->name, rq->sector, rq->sector+nsect-1,
(unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
#endif
ide_unmap_buffer(to, &flags);
rq->sector += nsect;
rq->errors = 0;
i = (rq->nr_sectors -= nsect);
if (((long)(rq->current_nr_sectors -= nsect)) <= 0)
idedisk_end_request(drive, 1);
/*
* Another BH Page walker and DATA INTERGRITY Questioned on ERROR.
* If passed back up on multimode read, BAD DATA could be ACKED
* to FILE SYSTEMS above ...
*/
if (i > 0) {
if (msect)
goto read_next;
ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
return ide_started;
}
return ide_stopped;
}
/*
* write_intr() is the handler for disk write interrupts
*/
static ide_startstop_t write_intr (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
ide_hwif_t *hwif = HWIF(drive);
struct request *rq = hwgroup->rq;
u32 i = 0;
u8 stat;
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),
DRIVE_READY, drive->bad_wstat)) {
printk("%s: write_intr error1: nr_sectors=%ld, stat=0x%02x\n",
drive->name, rq->nr_sectors, stat);
} else {
#ifdef DEBUG
printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
drive->name, rq->sector, (unsigned long) rq->buffer,
rq->nr_sectors-1);
#endif
if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
rq->sector++;
rq->errors = 0;
i = --rq->nr_sectors;
--rq->current_nr_sectors;
if (((long)rq->current_nr_sectors) <= 0)
idedisk_end_request(drive, 1);
if (i > 0) {
unsigned long flags;
char *to = ide_map_buffer(rq, &flags);
taskfile_output_data(drive, to, SECTOR_WORDS);
ide_unmap_buffer(to, &flags);
ide_set_handler(drive, &write_intr, WAIT_CMD,
NULL);
return ide_started;
}
return ide_stopped;
}
/* the original code did this here (?) */
return ide_stopped;
}
return DRIVER(drive)->error(drive, "write_intr", stat);
}
/*
* ide_multwrite() transfers a block of up to mcount sectors of data
* to a drive as part of a disk multiple-sector write operation.
*
* Returns 0 on success.
*
* Note that we may be called from two contexts - the do_rw_disk context
* and IRQ context. The IRQ can happen any time after we've output the
* full "mcount" number of sectors, so we must make sure we update the
* state _before_ we output the final part of the data!
*
* The update and return to BH is a BLOCK Layer Fakey to get more data
* to satisfy the hardware atomic segment. If the hardware atomic segment
* is shorter or smaller than the BH segment then we should be OKAY.
* This is only valid if we can rewind the rq->current_nr_sectors counter.
*/
int ide_multwrite (ide_drive_t *drive, unsigned int mcount)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
struct request *rq = &hwgroup->wrq;
do {
char *buffer;
int nsect = rq->current_nr_sectors;
unsigned long flags;
if (nsect > mcount)
nsect = mcount;
mcount -= nsect;
buffer = ide_map_buffer(rq, &flags);
rq->sector += nsect;
rq->nr_sectors -= nsect;
rq->current_nr_sectors -= nsect;
/* Do we move to the next bh after this? */
if (!rq->current_nr_sectors) {
struct buffer_head *bh = rq->bh->b_reqnext;
/* end early early we ran out of requests */
if (!bh) {
mcount = 0;
} else {
rq->bh = bh;
rq->current_nr_sectors = bh->b_size >> 9;
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->buffer = bh->b_data;
}
}
/*
* Ok, we're all setup for the interrupt
* re-entering us on the last transfer.
*/
taskfile_output_data(drive, buffer, nsect<<7);
ide_unmap_buffer(buffer, &flags);
} while (mcount);
return 0;
}
/*
* multwrite_intr() is the handler for disk multwrite interrupts
*/
static ide_startstop_t multwrite_intr (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
ide_hwif_t *hwif = HWIF(drive);
struct request *rq = &hwgroup->wrq;
u32 i = 0;
u8 stat;
if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),
DRIVE_READY, drive->bad_wstat)) {
if (stat & DRQ_STAT) {
/*
* The drive wants data. Remember rq is the copy
* of the request
*/
if (rq->nr_sectors) {
if (ide_multwrite(drive, drive->mult_count))
return ide_stopped;
ide_set_handler(drive, &multwrite_intr,
WAIT_CMD, NULL);
return ide_started;
}
} else {
/*
* If the copy has all the blocks completed then
* we can end the original request.
*/
if (!rq->nr_sectors) { /* all done? */
rq = hwgroup->rq;
for (i = rq->nr_sectors; i > 0;) {
i -= rq->current_nr_sectors;
idedisk_end_request(drive, 1);
}
return ide_stopped;
}
}
/* the original code did this here (?) */
return ide_stopped;
}
return DRIVER(drive)->error(drive, "multwrite_intr", stat);
}
/*
* __ide_do_rw_disk() issues READ and WRITE commands to a disk,
* using LBA if supported, or CHS otherwise, to address sectors.
* It also takes care of issuing special DRIVE_CMDs.
*/
ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long block)
{
ide_hwif_t *hwif = HWIF(drive);
u8 lba48 = (drive->addressing == 1) ? 1 : 0;
task_ioreg_t command = WIN_NOP;
ata_nsector_t nsectors;
nsectors.all = (u16) rq->nr_sectors;
if (driver_blocked)
panic("Request while ide driver is blocked?");
if (IDE_CONTROL_REG)
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
if (drive->select.b.lba) {
if (drive->addressing == 1) {
task_ioreg_t tasklets[10];
tasklets[0] = 0;
tasklets[1] = 0;
tasklets[2] = nsectors.b.low;
tasklets[3] = nsectors.b.high;
tasklets[4] = (task_ioreg_t) block;
tasklets[5] = (task_ioreg_t) (block>>8);
tasklets[6] = (task_ioreg_t) (block>>16);
tasklets[7] = (task_ioreg_t) (block>>24);
tasklets[8] = (task_ioreg_t) 0;
tasklets[9] = (task_ioreg_t) 0;
// tasklets[8] = (task_ioreg_t) (block>>32);
// tasklets[9] = (task_ioreg_t) (block>>40);
#ifdef DEBUG
printk("%s: %sing: LBAsect=%lu, sectors=%ld, "
"buffer=0x%08lx, LBAsect=0x%012lx\n",
drive->name,
(rq->cmd==READ)?"read":"writ",
block,
rq->nr_sectors,
(unsigned long) rq->buffer,
block);
printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
drive->name, tasklets[3], tasklets[2],
tasklets[9], tasklets[8], tasklets[7],
tasklets[6], tasklets[5], tasklets[4]);
#endif
hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
hwif->OUTB(tasklets[8], IDE_LCYL_REG);
hwif->OUTB(tasklets[9], IDE_HCYL_REG);
hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
hwif->OUTB(tasklets[5], IDE_LCYL_REG);
hwif->OUTB(tasklets[6], IDE_HCYL_REG);
hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
} else {
#ifdef DEBUG
printk("%s: %sing: LBAsect=%ld, sectors=%ld, "
"buffer=0x%08lx\n",
drive->name, (rq->cmd==READ)?"read":"writ",
block, rq->nr_sectors,
(unsigned long) rq->buffer);
#endif
hwif->OUTB(0x00, IDE_FEATURE_REG);
hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
hwif->OUTB(block, IDE_SECTOR_REG);
hwif->OUTB(block>>=8, IDE_LCYL_REG);
hwif->OUTB(block>>=8, IDE_HCYL_REG);
hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
}
} else {
unsigned int sect,head,cyl,track;
track = block / drive->sect;
sect = block % drive->sect + 1;
hwif->OUTB(sect, IDE_SECTOR_REG);
head = track % drive->head;
cyl = track / drive->head;
hwif->OUTB(0x00, IDE_FEATURE_REG);
hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
hwif->OUTB(cyl, IDE_LCYL_REG);
hwif->OUTB(cyl>>8, IDE_HCYL_REG);
hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
#ifdef DEBUG
printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
drive->name, (rq->cmd==READ)?"read":"writ", cyl,
head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
#endif
}
if (rq_data_dir(rq) == READ) {
#ifdef CONFIG_BLK_DEV_IDEDMA
if (drive->using_dma && !hwif->ide_dma_read(drive))
return ide_started;
#endif /* CONFIG_BLK_DEV_IDEDMA */
if (HWGROUP(drive)->handler != NULL)
BUG();
command = ((drive->mult_count) ?
((lba48) ? WIN_MULTREAD_EXT : WIN_MULTREAD) :
((lba48) ? WIN_READ_EXT : WIN_READ));
ide_execute_command(drive, command, &read_intr, WAIT_CMD, NULL);
return ide_started;
} else if (rq_data_dir(rq) == WRITE) {
ide_startstop_t startstop;
#ifdef CONFIG_BLK_DEV_IDEDMA
if (drive->using_dma && !(HWIF(drive)->ide_dma_write(drive)))
return ide_started;
#endif /* CONFIG_BLK_DEV_IDEDMA */
command = ((drive->mult_count) ?
((lba48) ? WIN_MULTWRITE_EXT : WIN_MULTWRITE) :
((lba48) ? WIN_WRITE_EXT : WIN_WRITE));
hwif->OUTB(command, IDE_COMMAND_REG);
if (ide_wait_stat(&startstop, drive, DATA_READY,
drive->bad_wstat, WAIT_DRQ)) {
printk(KERN_ERR "%s: no DRQ after issuing %s\n",
drive->name,
drive->mult_count ? "MULTWRITE" : "WRITE");
return startstop;
}
if (!drive->unmask)
local_irq_disable();
if (drive->mult_count) {
ide_hwgroup_t *hwgroup = HWGROUP(drive);
/*
* Ugh.. this part looks ugly because we MUST set up
* the interrupt handler before outputting the first block
* of data to be written. If we hit an error (corrupted buffer list)
* in ide_multwrite(), then we need to remove the handler/timer
* before returning. Fortunately, this NEVER happens (right?).
*
* Except when you get an error it seems...
*
* MAJOR DATA INTEGRITY BUG !!! only if we error
*/
hwgroup->wrq = *rq; /* scratchpad */
ide_set_handler(drive, &multwrite_intr, WAIT_CMD, NULL);
if (ide_multwrite(drive, drive->mult_count)) {
unsigned long flags;
spin_lock_irqsave(&io_request_lock, flags);
hwgroup->handler = NULL;
del_timer(&hwgroup->timer);
spin_unlock_irqrestore(&io_request_lock, flags);
return ide_stopped;
}
} else {
unsigned long flags;
char *to = ide_map_buffer(rq, &flags);
ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
taskfile_output_data(drive, to, SECTOR_WORDS);
ide_unmap_buffer(to, &flags);
}
return ide_started;
}
printk(KERN_ERR "%s: bad command: %d\n", drive->name, rq->cmd);
idedisk_end_request(drive, 0);
return ide_stopped;
}
#else /* CONFIG_IDE_TASKFILE_IO */
static ide_startstop_t chs_rw_disk(ide_drive_t *, struct request *, unsigned
long);
static ide_startstop_t lba_28_rw_disk(ide_drive_t *, struct request *, unsigned
long);
static ide_startstop_t lba_48_rw_disk(ide_drive_t *, struct request *, unsigned
long long);
/*
* __ide_do_rw_disk() issues READ and WRITE commands to a disk,
* using LBA if supported, or CHS otherwise, to address sectors.
* It also takes care of issuing special DRIVE_CMDs.
*/
ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long block)
{
if (!blk_fs_request(rq)) {
printk(KERN_ERR "%s: bad command: %d\n", drive->name, rq->cmd);
idedisk_end_request(drive, 0);
return ide_stopped;
}
/*
* 268435455 == 137439 MB or 28bit limit
*
* need to add split taskfile operations based on 28bit threshold.
*/
if (drive->addressing == 1) /* 48-bit LBA */
return lba_48_rw_disk(drive, rq, (unsigned long long) block);
if (drive->select.b.lba) /* 28-bit LBA */
return lba_28_rw_disk(drive, rq, (unsigned long) block);
/* 28-bit CHS : DIE DIE DIE piece of legacy crap!!! */
return chs_rw_disk(drive, rq, (unsigned long) block);
}
static task_ioreg_t get_command (ide_drive_t *drive, int cmd)
{
int lba48bit = (drive->id->cfs_enable_2 & 0x0400) ? 1 : 0;
#if 1
lba48bit = (drive->addressing == 1) ? 1 : 0;
#endif
if ((cmd == READ) && (drive->using_dma))
return (lba48bit) ? WIN_READDMA_EXT : WIN_READDMA;
else if ((cmd == READ) && (drive->mult_count))
return (lba48bit) ? WIN_MULTREAD_EXT : WIN_MULTREAD;
else if (cmd == READ)
return (lba48bit) ? WIN_READ_EXT : WIN_READ;
else if ((cmd == WRITE) && (drive->using_dma))
return (lba48bit) ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
else if ((cmd == WRITE) && (drive->mult_count))
return (lba48bit) ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
else if (cmd == WRITE)
return (lba48bit) ? WIN_WRITE_EXT : WIN_WRITE;
else
return WIN_NOP;
}
static ide_startstop_t chs_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long block)
{
ide_task_t args;
int sectors;
ata_nsector_t nsectors;
task_ioreg_t command = get_command(drive, rq_data_dir(rq));
unsigned int track = (block / drive->sect);
unsigned int sect = (block % drive->sect) + 1;
unsigned int head = (track % drive->head);
unsigned int cyl = (track / drive->head);
nsectors.all = (u16) rq->nr_sectors;
#ifdef DEBUG
printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" :
"writ");
printk("CHS=%d/%d/%d, ", cyl, head, sect);
printk("sectors=%ld, ", rq->nr_sectors);
printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
#endif
memset(&args, 0, sizeof(ide_task_t));
sectors = (rq->nr_sectors == 256) ? 0x00 : rq->nr_sectors;
args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
args.tfRegister[IDE_SECTOR_OFFSET] = sect;
args.tfRegister[IDE_LCYL_OFFSET] = cyl;
args.tfRegister[IDE_HCYL_OFFSET] = (cyl>>8);
args.tfRegister[IDE_SELECT_OFFSET] = head;
args.tfRegister[IDE_SELECT_OFFSET] |= drive->select.all;
args.tfRegister[IDE_COMMAND_OFFSET] = command;
args.command_type = ide_cmd_type_parser(&args);
args.rq = (struct request *) rq;
rq->special = (ide_task_t *)&args;
return do_rw_taskfile(drive, &args);
}
static ide_startstop_t lba_28_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long block)
{
ide_task_t args;
int sectors;
ata_nsector_t nsectors;
task_ioreg_t command = get_command(drive, rq_data_dir(rq));
nsectors.all = (u16) rq->nr_sectors;
#ifdef DEBUG
printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" :
"writ");
printk("LBAsect=%lld, ", block);
printk("sectors=%ld, ", rq->nr_sectors);
printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
#endif
memset(&args, 0, sizeof(ide_task_t));
sectors = (rq->nr_sectors == 256) ? 0x00 : rq->nr_sectors;
args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
args.tfRegister[IDE_SECTOR_OFFSET] = block;
args.tfRegister[IDE_LCYL_OFFSET] = (block>>=8);
args.tfRegister[IDE_HCYL_OFFSET] = (block>>=8);
args.tfRegister[IDE_SELECT_OFFSET] = ((block>>8)&0x0f);
args.tfRegister[IDE_SELECT_OFFSET] |= drive->select.all;
args.tfRegister[IDE_COMMAND_OFFSET] = command;
args.command_type = ide_cmd_type_parser(&args);
args.rq = (struct request *) rq;
rq->special = (ide_task_t *)&args;
return do_rw_taskfile(drive, &args);
}
/*
* 268435455 == 137439 MB or 28bit limit
* 320173056 == 163929 MB or 48bit addressing
* 1073741822 == 549756 MB or 48bit addressing fake drive
*/
static ide_startstop_t lba_48_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long long block)
{
ide_task_t args;
int sectors;
ata_nsector_t nsectors;
task_ioreg_t command = get_command(drive, rq_data_dir(rq));
nsectors.all = (u16) rq->nr_sectors;
#ifdef DEBUG
printk("%s: %sing: ", drive->name, (rq_data_dir(rq)==READ) ? "read" :
"writ");
printk("LBAsect=%lld, ", block);
printk("sectors=%ld, ", rq->nr_sectors);
printk("buffer=0x%08lx\n", (unsigned long) rq->buffer);
#endif
memset(&args, 0, sizeof(ide_task_t));
sectors = (rq->nr_sectors == 65536) ? 0 : rq->nr_sectors;
args.tfRegister[IDE_NSECTOR_OFFSET] = sectors;
args.tfRegister[IDE_SECTOR_OFFSET] = block; /* low lba */
args.tfRegister[IDE_LCYL_OFFSET] = (block>>=8); /* mid lba */
args.tfRegister[IDE_HCYL_OFFSET] = (block>>=8); /* hi lba */
args.tfRegister[IDE_SELECT_OFFSET] = drive->select.all;
args.tfRegister[IDE_COMMAND_OFFSET] = command;
args.hobRegister[IDE_NSECTOR_OFFSET_HOB]= sectors >> 8;
args.hobRegister[IDE_SECTOR_OFFSET_HOB] = (block>>=8); /* low lba */
args.hobRegister[IDE_LCYL_OFFSET_HOB] = (block>>=8); /* mid lba */
args.hobRegister[IDE_HCYL_OFFSET_HOB] = (block>>=8); /* hi lba */
args.hobRegister[IDE_SELECT_OFFSET_HOB] = drive->select.all;
args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
args.command_type = ide_cmd_type_parser(&args);
args.rq = (struct request *) rq;
rq->special = (ide_task_t *)&args;
return do_rw_taskfile(drive, &args);
}
#endif /* CONFIG_IDE_TASKFILE_IO */
static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq,
unsigned long block)
{
ide_hwif_t *hwif = HWIF(drive);
if (hwif->rw_disk)
return hwif->rw_disk(drive, rq, block);
else
return __ide_do_rw_disk(drive, rq, block);
}
EXPORT_SYMBOL_GPL(__ide_do_rw_disk);
static int idedisk_open (struct inode *inode, struct file *filp, ide_drive_t
*drive)
{
MOD_INC_USE_COUNT;
if (drive->removable && drive->usage == 1) {
ide_task_t args;
int cf;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
args.command_type = ide_cmd_type_parser(&args);
check_disk_change(inode->i_rdev);
/*
* Ignore the return code from door_lock,
* since the open() has already succeeded,
* and the door_lock is irrelevant at this point.
*/
if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
drive->doorlocking = 0;
drive->wcache = 0;
/* Cache enabled ? */
if (drive->id->csfo & 1)
drive->wcache = 1;
/* Cache command set available ? */
if (drive->id->cfs_enable_1 & (1<<5))
drive->wcache = 1;
/* ATA6 cache extended commands */
cf = drive->id->command_set_2 >> 24;
if((cf & 0xC0) == 0x40 && (cf & 0x30) != 0)
drive->wcache = 1;
}
return 0;
}
static int do_idedisk_flushcache(ide_drive_t *drive);
static int ide_cacheflush_p(ide_drive_t *drive)
{
if(drive->wcache)
{
if (do_idedisk_flushcache(drive))
{
printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
drive->name);
return -EIO;
}
return 1;
}
return 0;
}
static void idedisk_release (struct inode *inode, struct file *filp,
ide_drive_t *drive)
{
if (drive->removable && !drive->usage) {
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
args.command_type = ide_cmd_type_parser(&args);
invalidate_bdev(inode->i_bdev, 0);
if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
drive->doorlocking = 0;
}
ide_cacheflush_p(drive);
MOD_DEC_USE_COUNT;
}
static int idedisk_media_change (ide_drive_t *drive)
{
/* if removable, always assume it was changed */
return drive->removable;
}
static void idedisk_revalidate (ide_drive_t *drive)
{
grok_partitions(HWIF(drive)->gd, drive->select.b.unit,
1<<PARTN_BITS,
current_capacity(drive));
}
static int idedisk_end_request (ide_drive_t *drive, int uptodate)
{
struct request *rq;
unsigned long flags;
int ret = 1;
spin_lock_irqsave(&io_request_lock, flags);
rq = HWGROUP(drive)->rq;
/*
* decide whether to reenable DMA -- 3 is a random magic for now,
* if we DMA timeout more than 3 times, just stay in PIO
*/
if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
drive->state = 0;
HWGROUP(drive)->hwif->ide_dma_on(drive);
}
if (!end_that_request_first(rq, uptodate, drive->name)) {
add_blkdev_randomness(MAJOR(rq->rq_dev));
blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
end_that_request_last(rq);
ret = 0;
}
spin_unlock_irqrestore(&io_request_lock, flags);
return ret;
}
static u8 idedisk_dump_status (ide_drive_t *drive, const char *msg, u8 stat)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned long flags;
u8 err = 0;
local_irq_set(flags);
printk("%s: %s: status=0x%02x", drive->name, msg, stat);
#if FANCY_STATUS_DUMPS
printk(" { ");
if (stat & BUSY_STAT)
printk("Busy ");
else {
if (stat & READY_STAT) printk("DriveReady ");
if (stat & WRERR_STAT) printk("DeviceFault ");
if (stat & SEEK_STAT) printk("SeekComplete ");
if (stat & DRQ_STAT) printk("DataRequest ");
if (stat & ECC_STAT) printk("CorrectedError ");
if (stat & INDEX_STAT) printk("Index ");
if (stat & ERR_STAT) printk("Error ");
}
printk("}");
#endif /* FANCY_STATUS_DUMPS */
printk("\n");
if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
err = hwif->INB(IDE_ERROR_REG);
printk("%s: %s: error=0x%02x", drive->name, msg, err);
#if FANCY_STATUS_DUMPS
printk(" { ");
if (err & ABRT_ERR) printk("DriveStatusError ");
if (err & ICRC_ERR)
printk("Bad%s ", (err & ABRT_ERR) ? "CRC" : "Sector");
if (err & ECC_ERR) printk("UncorrectableError ");
if (err & ID_ERR) printk("SectorIdNotFound ");
if (err & TRK0_ERR) printk("TrackZeroNotFound ");
if (err & MARK_ERR) printk("AddrMarkNotFound ");
printk("}");
if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
(err & (ECC_ERR|ID_ERR|MARK_ERR))) {
if (drive->addressing == 1) {
__u64 sectors = 0;
u32 low = 0, high = 0;
low = idedisk_read_24(drive);
hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
high = idedisk_read_24(drive);
sectors = ((__u64)high << 24) | low;
printk(", LBAsect=%llu, high=%d, low=%d",
(unsigned long long) sectors,
high, low);
} else {
u8 cur = hwif->INB(IDE_SELECT_REG);
if (cur & 0x40) { /* using LBA? */
printk(", LBAsect=%ld", (unsigned long)
((cur&0xf)<<24)
|(hwif->INB(IDE_HCYL_REG)<<16)
|(hwif->INB(IDE_LCYL_REG)<<8)
| hwif->INB(IDE_SECTOR_REG));
} else {
printk(", CHS=%d/%d/%d",
(hwif->INB(IDE_HCYL_REG)<<8) +
hwif->INB(IDE_LCYL_REG),
cur & 0xf,
hwif->INB(IDE_SECTOR_REG));
}
}
if (HWGROUP(drive) && HWGROUP(drive)->rq)
printk(", sector=%ld",
HWGROUP(drive)->rq->sector);
}
}
#endif /* FANCY_STATUS_DUMPS */
printk("\n");
local_irq_restore(flags);
return err;
}
ide_startstop_t idedisk_error (ide_drive_t *drive, const char *msg, u8 stat)
{
ide_hwif_t *hwif;
struct request *rq;
u8 err;
int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
err = idedisk_dump_status(drive, msg, stat);
if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
return ide_stopped;
hwif = HWIF(drive);
/* retry only "normal" I/O: */
switch (rq->cmd) {
case IDE_DRIVE_CMD:
case IDE_DRIVE_TASK:
case IDE_DRIVE_TASKFILE:
rq->errors = 1;
ide_end_drive_cmd(drive, stat, err);
return ide_stopped;
#if 0
case IDE_DRIVE_TASKFILE:
rq->errors = 1;
ide_end_taskfile(drive, stat, err);
return ide_stopped;
#endif
default:
break;
}
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
/* other bits are useless when BUSY */
rq->errors |= ERROR_RESET;
} else if (stat & ERR_STAT) {
/* err has different meaning on cdrom and tape */
if (err == ABRT_ERR) {
if (drive->select.b.lba &&
/* some newer drives don't support WIN_SPECIFY */
hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY)
return ide_stopped;
} else if ((err & BAD_CRC) == BAD_CRC) {
/* UDMA crc error, just retry the operation */
drive->crc_count++;
} else if (err & (BBD_ERR | ECC_ERR)) {
/* retries won't help these */
rq->errors = ERROR_MAX;
} else if (err & TRK0_ERR) {
/* help it find track zero */
rq->errors |= ERROR_RECAL;
}
}
if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ) {
/*
* try_to_flush_leftover_data() is invoked in response to
* a drive unexpectedly having its DRQ_STAT bit set. As
* an alternative to resetting the drive, this routine
* tries to clear the condition by read a sector's worth
* of data from the drive. Of course, this may not help
* if the drive is *waiting* for data from *us*.
*/
while (i > 0) {
u32 buffer[16];
unsigned int wcount = (i > 16) ? 16 : i;
i -= wcount;
taskfile_input_data(drive, buffer, wcount);
}
}
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
/* force an abort */
hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
}
if (rq->errors >= ERROR_MAX)
DRIVER(drive)->end_request(drive, 0);
else {
if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
++rq->errors;
return ide_do_reset(drive);
}
if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
drive->special.b.recalibrate = 1;
++rq->errors;
}
return ide_stopped;
}
ide_startstop_t idedisk_abort(ide_drive_t *drive, const char *msg)
{
ide_hwif_t *hwif;
struct request *rq;
if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
return ide_stopped;
hwif = HWIF(drive);
/* retry only "normal" I/O: */
switch (rq->cmd) {
case IDE_DRIVE_CMD:
case IDE_DRIVE_TASK:
case IDE_DRIVE_TASKFILE:
rq->errors = 1;
ide_end_drive_cmd(drive, BUSY_STAT, 0);
return ide_stopped;
#if 0
case IDE_DRIVE_TASKFILE:
rq->errors = 1;
ide_end_taskfile(drive, BUSY_STAT, 0);
return ide_stopped;
#endif
default:
break;
}
rq->errors |= ERROR_RESET;
DRIVER(drive)->end_request(drive, 0);
return ide_stopped;
}
/*
* Queries for true maximum capacity of the drive.
* Returns maximum LBA address (> 0) of the drive, 0 if failed.
*/
static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
{
ide_task_t args;
unsigned long addr = 0;
/* Create IDE/ATA command request structure */
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_READ_NATIVE_MAX;
args.command_type = ide_cmd_type_parser(&args);
/* submit command request */
ide_raw_taskfile(drive, &args, NULL);
/* if OK, compute maximum address value */
if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
| ((args.tfRegister[ IDE_HCYL_OFFSET] ) << 16)
| ((args.tfRegister[ IDE_LCYL_OFFSET] ) << 8)
| ((args.tfRegister[IDE_SECTOR_OFFSET] ));
}
addr++; /* since the return value is (maxlba - 1), we add 1 */
return addr;
}
static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t
*drive)
{
ide_task_t args;
unsigned long long addr = 0;
/* Create IDE/ATA command request structure */
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_READ_NATIVE_MAX_EXT;
args.command_type = ide_cmd_type_parser(&args);
/* submit command request */
ide_raw_taskfile(drive, &args, NULL);
/* if OK, compute maximum address value */
if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
u32 high = ((args.hobRegister[IDE_HCYL_OFFSET_HOB])<<16) |
((args.hobRegister[IDE_LCYL_OFFSET_HOB])<<8) |
(args.hobRegister[IDE_SECTOR_OFFSET_HOB]);
u32 low = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
(args.tfRegister[IDE_SECTOR_OFFSET]);
addr = ((__u64)high << 24) | low;
}
addr++; /* since the return value is (maxlba - 1), we add 1 */
return addr;
}
#ifdef CONFIG_IDEDISK_STROKE
/*
* Sets maximum virtual LBA address of the drive.
* Returns new maximum virtual LBA address (> 0) or 0 on failure.
*/
static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long
addr_req)
{
ide_task_t args;
unsigned long addr_set = 0;
addr_req--;
/* Create IDE/ATA command request structure */
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_SECTOR_OFFSET] = ((addr_req >> 0) & 0xff);
args.tfRegister[IDE_LCYL_OFFSET] = ((addr_req >> 8) & 0xff);
args.tfRegister[IDE_HCYL_OFFSET] = ((addr_req >> 16) & 0xff);
args.tfRegister[IDE_SELECT_OFFSET] = ((addr_req >> 24) & 0x0f) |
0x40;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SET_MAX;
args.command_type = ide_cmd_type_parser(&args);
/* submit command request */
ide_raw_taskfile(drive, &args, NULL);
/* if OK, read new maximum address value */
if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
| ((args.tfRegister[ IDE_HCYL_OFFSET] ) << 16)
| ((args.tfRegister[ IDE_LCYL_OFFSET] ) << 8)
| ((args.tfRegister[IDE_SECTOR_OFFSET] ));
}
addr_set++;
return addr_set;
}
static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive,
unsigned long long addr_req)
{
ide_task_t args;
unsigned long long addr_set = 0;
addr_req--;
/* Create IDE/ATA command request structure */
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_SECTOR_OFFSET] = ((addr_req >> 0) & 0xff);
args.tfRegister[IDE_LCYL_OFFSET] = ((addr_req >>= 8) & 0xff);
args.tfRegister[IDE_HCYL_OFFSET] = ((addr_req >>= 8) & 0xff);
args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SET_MAX_EXT;
args.hobRegister[IDE_SECTOR_OFFSET_HOB] = ((addr_req >>= 8) & 0xff);
args.hobRegister[IDE_LCYL_OFFSET_HOB] = ((addr_req >>= 8) & 0xff);
args.hobRegister[IDE_HCYL_OFFSET_HOB] = ((addr_req >>= 8) & 0xff);
args.hobRegister[IDE_SELECT_OFFSET_HOB] = 0x40;
args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
args.command_type = ide_cmd_type_parser(&args);
/* submit command request */
ide_raw_taskfile(drive, &args, NULL);
/* if OK, compute maximum address value */
if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
u32 high = ((args.hobRegister[IDE_HCYL_OFFSET_HOB])<<16) |
((args.hobRegister[IDE_LCYL_OFFSET_HOB])<<8) |
(args.hobRegister[IDE_SECTOR_OFFSET_HOB]);
u32 low = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
(args.tfRegister[IDE_SECTOR_OFFSET]);
addr_set = ((__u64)high << 24) | low;
}
return addr_set;
}
#endif /* CONFIG_IDEDISK_STROKE */
/*
* Tests if the drive supports Host Protected Area feature.
* Returns true if supported, false otherwise.
*/
static inline int idedisk_supports_host_protected_area(ide_drive_t *drive)
{
int flag = (drive->id->cfs_enable_1 & 0x0400) ? 1 : 0;
if (flag)
printk("%s: host protected area => %d\n", drive->name, flag);
return flag;
}
/*
* Compute drive->capacity, the full capacity of the drive
* Called with drive->id != NULL.
*
* To compute capacity, this uses either of
*
* 1. CHS value set by user (whatever user sets will be trusted)
* 2. LBA value from target drive (require new ATA feature)
* 3. LBA value from system BIOS (new one is OK, old one may break)
* 4. CHS value from system BIOS (traditional style)
*
* in above order (i.e., if value of higher priority is available,
* reset will be ignored).
*/
#define IDE_STROKE_LIMIT (32000*1024*2)
static void init_idedisk_capacity (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
unsigned long capacity = drive->cyl * drive->head * drive->sect;
int have_setmax = idedisk_supports_host_protected_area(drive);
unsigned long set_max =
(have_setmax ? idedisk_read_native_max_address(drive) : 0);
unsigned long long capacity_2 = capacity;
unsigned long long set_max_ext;
drive->capacity48 = 0;
drive->select.b.lba = 0;
if (id->cfs_enable_2 & 0x0400) {
capacity_2 = id->lba_capacity_2;
drive->head = drive->bios_head = 255;
drive->sect = drive->bios_sect = 63;
drive->cyl = (unsigned int) capacity_2 / (drive->head *
drive->sect);
drive->select.b.lba = 1;
set_max_ext = idedisk_read_native_max_address_ext(drive);
if (set_max_ext > capacity_2 && capacity_2 > IDE_STROKE_LIMIT) {
#ifdef CONFIG_IDEDISK_STROKE
set_max_ext =
idedisk_read_native_max_address_ext(drive);
set_max_ext = idedisk_set_max_address_ext(drive,
set_max_ext);
if (set_max_ext) {
drive->capacity48 = capacity_2 = set_max_ext;
drive->cyl = (unsigned int) set_max_ext /
(drive->head * drive->sect);
drive->select.b.lba = 1;
drive->id->lba_capacity_2 = capacity_2;
}
#else /* !CONFIG_IDEDISK_STROKE */
printk(KERN_INFO "%s: setmax_ext LBA %llu, native
%llu\n",
drive->name, set_max_ext, capacity_2);
#endif /* CONFIG_IDEDISK_STROKE */
}
drive->cyl = (unsigned int) capacity_2 / (drive->head *
drive->sect);
drive->bios_cyl = drive->cyl;
drive->capacity48 = capacity_2;
drive->capacity = (unsigned long) capacity_2;
goto check_capacity48;
/* Determine capacity, and use LBA if the drive properly supports it */
} else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
capacity = id->lba_capacity;
drive->cyl = capacity / (drive->head * drive->sect);
drive->select.b.lba = 1;
}
if (set_max > capacity && capacity > IDE_STROKE_LIMIT) {
#ifdef CONFIG_IDEDISK_STROKE
set_max = idedisk_read_native_max_address(drive);
set_max = idedisk_set_max_address(drive, set_max);
if (set_max) {
drive->capacity = capacity = set_max;
drive->cyl = set_max / (drive->head * drive->sect);
drive->select.b.lba = 1;
drive->id->lba_capacity = capacity;
}
#else /* !CONFIG_IDEDISK_STROKE */
printk(KERN_INFO "%s: setmax LBA %lu, native %lu\n",
drive->name, set_max, capacity);
#endif /* CONFIG_IDEDISK_STROKE */
}
drive->capacity = capacity;
if ((id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)) {
drive->capacity48 = id->lba_capacity_2;
drive->head = 255;
drive->sect = 63;
drive->cyl = (unsigned long)(drive->capacity48) / (drive->head
* drive->sect);
}
check_capacity48:
/* Limit disk size to 137GB if LBA48 addressing is not supported */
if (drive->addressing == 0 && drive->capacity48 > (1ULL)<<28) {
printk("%s: cannot use LBA48 - capacity reset "
"from %llu to %llu\n",
drive->name, drive->capacity48, (1ULL)<<28);
drive->capacity48 = (1ULL)<<28;
}
}
static unsigned long idedisk_capacity (ide_drive_t *drive)
{
if (drive->id->cfs_enable_2 & 0x0400)
return (drive->capacity48 - drive->sect0);
return (drive->capacity - drive->sect0);
}
static ide_startstop_t idedisk_special (ide_drive_t *drive)
{
special_t *s = &drive->special;
if (s->b.set_geometry) {
s->b.set_geometry = 0;
if (!IS_PDC4030_DRIVE) {
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_NSECTOR_OFFSET] = drive->sect;
args.tfRegister[IDE_SECTOR_OFFSET] = drive->sect;
args.tfRegister[IDE_LCYL_OFFSET] = drive->cyl;
args.tfRegister[IDE_HCYL_OFFSET] = drive->cyl>>8;
args.tfRegister[IDE_SELECT_OFFSET] =
((drive->head-1)|drive->select.all)&0xBF;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SPECIFY;
args.command_type = ide_cmd_type_parser(&args);
do_rw_taskfile(drive, &args);
}
} else if (s->b.recalibrate) {
s->b.recalibrate = 0;
if (!IS_PDC4030_DRIVE) {
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_NSECTOR_OFFSET] = drive->sect;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_RESTORE;
args.command_type = ide_cmd_type_parser(&args);
do_rw_taskfile(drive, &args);
}
} else if (s->b.set_multmode) {
s->b.set_multmode = 0;
if (drive->mult_req > drive->id->max_multsect)
drive->mult_req = drive->id->max_multsect;
if (!IS_PDC4030_DRIVE) {
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_NSECTOR_OFFSET] = drive->mult_req;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETMULT;
args.command_type = ide_cmd_type_parser(&args);
do_rw_taskfile(drive, &args);
}
} else if (s->all) {
int special = s->all;
s->all = 0;
printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name,
special);
return ide_stopped;
}
return IS_PDC4030_DRIVE ? ide_stopped : ide_started;
}
static void idedisk_pre_reset (ide_drive_t *drive)
{
int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
drive->special.all = 0;
drive->special.b.set_geometry = legacy;
drive->special.b.recalibrate = legacy;
if (OK_TO_RESET_CONTROLLER)
drive->mult_count = 0;
if (!drive->keep_settings && !drive->using_dma)
drive->mult_req = 0;
if (drive->mult_req != drive->mult_count)
drive->special.b.set_multmode = 1;
}
#ifdef CONFIG_PROC_FS
static int smart_enable(ide_drive_t *drive)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_FEATURE_OFFSET] = SMART_ENABLE;
args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
args.command_type = ide_cmd_type_parser(&args);
return ide_raw_taskfile(drive, &args, NULL);
}
static int get_smart_values(ide_drive_t *drive, u8 *buf)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_FEATURE_OFFSET] = SMART_READ_VALUES;
args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
args.command_type = ide_cmd_type_parser(&args);
(void) smart_enable(drive);
return ide_raw_taskfile(drive, &args, buf);
}
static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_FEATURE_OFFSET] = SMART_READ_THRESHOLDS;
args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
args.command_type = ide_cmd_type_parser(&args);
(void) smart_enable(drive);
return ide_raw_taskfile(drive, &args, buf);
}
static int proc_idedisk_read_cache
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
char *out = page;
int len;
if (drive->id_read)
len = sprintf(out,"%i\n", drive->id->buf_size / 2);
else
len = sprintf(out,"(none)\n");
PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}
static int proc_idedisk_read_smart_thresholds
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *)data;
int len = 0, i = 0;
if (!get_smart_thresholds(drive, page)) {
unsigned short *val = (unsigned short *) page;
char *out = ((char *)val) + (SECTOR_WORDS * 4);
page = out;
do {
out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i &
7) ? ' ' : '\n');
val += 1;
} while (i < (SECTOR_WORDS * 2));
len = out - page;
}
PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}
static int proc_idedisk_read_smart_values
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *)data;
int len = 0, i = 0;
if (!get_smart_values(drive, page)) {
unsigned short *val = (unsigned short *) page;
char *out = ((char *)val) + (SECTOR_WORDS * 4);
page = out;
do {
out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i &
7) ? ' ' : '\n');
val += 1;
} while (i < (SECTOR_WORDS * 2));
len = out - page;
}
PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}
static ide_proc_entry_t idedisk_proc[] = {
{ "cache", S_IFREG|S_IRUGO,
proc_idedisk_read_cache, NULL },
{ "geometry", S_IFREG|S_IRUGO, proc_ide_read_geometry,
NULL },
{ "smart_values", S_IFREG|S_IRUSR,
proc_idedisk_read_smart_values, NULL },
{ "smart_thresholds", S_IFREG|S_IRUSR,
proc_idedisk_read_smart_thresholds, NULL },
{ NULL, 0, NULL, NULL }
};
#else
#define idedisk_proc NULL
#endif /* CONFIG_PROC_FS */
/*
* This is tightly woven into the driver->do_special can not touch.
* DON'T do it again until a total personality rewrite is committed.
*/
static int set_multcount(ide_drive_t *drive, int arg)
{
struct request rq;
if (drive->special.b.set_multmode)
return -EBUSY;
ide_init_drive_cmd (&rq);
rq.cmd = IDE_DRIVE_CMD;
drive->mult_req = arg;
drive->special.b.set_multmode = 1;
(void) ide_do_drive_cmd (drive, &rq, ide_wait);
return (drive->mult_count == arg) ? 0 : -EIO;
}
static int set_nowerr(ide_drive_t *drive, int arg)
{
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->nowerr = arg;
drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
spin_unlock_irq(&io_request_lock);
return 0;
}
static int write_cache (ide_drive_t *drive, int arg)
{
ide_task_t args;
if (!(drive->id->cfs_enable_2 & 0x3000))
return 1;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_FEATURE_OFFSET] = (arg) ?
SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETFEATURES;
args.command_type = ide_cmd_type_parser(&args);
(void) ide_raw_taskfile(drive, &args, NULL);
drive->wcache = arg;
return 0;
}
static int call_idedisk_standby (ide_drive_t *drive, int arg)
{
ide_task_t args;
u8 standby = (arg) ? WIN_STANDBYNOW2 : WIN_STANDBYNOW1;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_COMMAND_OFFSET] = standby;
args.command_type = ide_cmd_type_parser(&args);
return ide_raw_taskfile(drive, &args, NULL);
}
static int do_idedisk_standby (ide_drive_t *drive)
{
return call_idedisk_standby(drive, 0);
}
static int call_idedisk_suspend (ide_drive_t *drive, int arg)
{
ide_task_t args;
u8 suspend = (arg) ? WIN_SLEEPNOW2 : WIN_SLEEPNOW1;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_COMMAND_OFFSET] = suspend;
args.command_type = ide_cmd_type_parser(&args);
return ide_raw_taskfile(drive, &args, NULL);
}
static int do_idedisk_suspend (ide_drive_t *drive)
{
if (drive->suspend_reset)
return 1;
ide_cacheflush_p(drive);
return call_idedisk_suspend(drive, 0);
}
#if 0
static int call_idedisk_checkpower (ide_drive_t *drive, int arg)
{
ide_task_t args;
u8 ckpw = (arg) ? WIN_CHECKPOWERMODE2 : WIN_CHECKPOWERMODE1;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_COMMAND_OFFSET] = ckpw;
args.command_type = ide_cmd_type_parser(&args);
ide_raw_taskfile(drive, &args, NULL);
#if 0
if (errno != EIO || args[0] != 0 || args[1] != 0)
state = "unknown";
else
state = "sleeping";
} else {
state = (args[2] == 255) ? "active/idle" : "standby";
#endif
return 0;
}
static int do_idedisk_checkpower (ide_drive_t *drive)
{
return call_idedisk_checkpower(drive, 0);
}
#endif
static int do_idedisk_resume (ide_drive_t *drive)
{
if (!drive->suspend_reset)
return 1;
return 0;
}
static int do_idedisk_flushcache (ide_drive_t *drive)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
if (drive->id->cfs_enable_2 & 0x2400)
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT;
else
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE;
args.command_type = ide_cmd_type_parser(&args);
return ide_raw_taskfile(drive, &args, NULL);
}
static int set_acoustic (ide_drive_t *drive, int arg)
{
ide_task_t args;
memset(&args, 0, sizeof(ide_task_t));
args.tfRegister[IDE_FEATURE_OFFSET] = (arg) ? SETFEATURES_EN_AAM :
SETFEATURES_DIS_AAM;
args.tfRegister[IDE_NSECTOR_OFFSET] = arg;
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETFEATURES;
args.command_type = ide_cmd_type_parser(&args);
ide_raw_taskfile(drive, &args, NULL);
drive->acoustic = arg;
return 0;
}
static int probe_lba_addressing (ide_drive_t *drive, int arg)
{
drive->addressing = 0;
if (HWIF(drive)->addressing)
return 0;
if (!(drive->id->cfs_enable_2 & 0x0400))
return -EIO;
drive->addressing = arg;
return 0;
}
static int set_lba_addressing (ide_drive_t *drive, int arg)
{
return (probe_lba_addressing(drive, arg));
}
static void idedisk_add_settings(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
int major = HWIF(drive)->major;
int minor = drive->select.b.unit << PARTN_BITS;
ide_add_setting(drive, "bios_cyl", SETTING_RW,
-1, -1,
TYPE_INT, 0, 65535, 1, 1,
&drive->bios_cyl, NULL);
ide_add_setting(drive, "bios_head", SETTING_RW,
-1, -1,
TYPE_BYTE, 0, 255, 1, 1,
&drive->bios_head, NULL);
ide_add_setting(drive, "bios_sect", SETTING_RW,
-1, -1,
TYPE_BYTE, 0, 63, 1, 1,
&drive->bios_sect, NULL);
ide_add_setting(drive, "address", SETTING_RW,
HDIO_GET_ADDRESS, HDIO_SET_ADDRESS,
TYPE_INTA, 0, 2, 1, 1,
&drive->addressing, set_lba_addressing);
ide_add_setting(drive, "bswap", SETTING_READ,
-1, -1,
TYPE_BYTE, 0, 1, 1, 1,
&drive->bswap, NULL);
ide_add_setting(drive, "multcount", id ? SETTING_RW :
SETTING_READ, HDIO_GET_MULTCOUNT, HDIO_SET_MULTCOUNT,
TYPE_BYTE, 0, id ? id->max_multsect : 0, 1, 1,
&drive->mult_count, set_multcount);
ide_add_setting(drive, "nowerr", SETTING_RW,
HDIO_GET_NOWERR, HDIO_SET_NOWERR,
TYPE_BYTE, 0, 1, 1, 1,
&drive->nowerr, set_nowerr);
ide_add_setting(drive, "breada_readahead", SETTING_RW,
BLKRAGET, BLKRASET,
TYPE_INT, 0, 255, 1, 1,
&read_ahead[major], NULL);
ide_add_setting(drive, "file_readahead", SETTING_RW,
BLKFRAGET, BLKFRASET,
TYPE_INTA, 0, 4096, PAGE_SIZE, 1024,
&max_readahead[major][minor], NULL);
ide_add_setting(drive, "max_kb_per_request", SETTING_RW,
BLKSECTGET, BLKSECTSET,
TYPE_INTA, 1, 255, 1, 1,
&max_sectors[major][minor], NULL);
ide_add_setting(drive, "lun", SETTING_RW,
-1, -1,
TYPE_INT, 0, 7, 1, 1,
&drive->lun, NULL);
ide_add_setting(drive, "wcache", SETTING_RW,
HDIO_GET_WCACHE, HDIO_SET_WCACHE,
TYPE_BYTE, 0, 1, 1, 1,
&drive->wcache, write_cache);
ide_add_setting(drive, "acoustic", SETTING_RW,
HDIO_GET_ACOUSTIC, HDIO_SET_ACOUSTIC,
TYPE_BYTE, 0, 254, 1, 1,
&drive->acoustic, set_acoustic);
ide_add_setting(drive, "failures", SETTING_RW,
-1, -1,
TYPE_INT, 0, 65535, 1, 1,
&drive->failures, NULL);
ide_add_setting(drive, "max_failures", SETTING_RW,
-1, -1,
TYPE_INT, 0, 65535, 1, 1,
&drive->max_failures, NULL);
}
static int idedisk_ioctl (ide_drive_t *drive, struct inode *inode,
struct file *file, unsigned int cmd, unsigned long arg)
{
#if 0
HDIO_GET_ADDRESS
HDIO_SET_ADDRESS
HDIO_GET_WCACHE
HDIO_SET_WCACHE
HDIO_GET_ACOUSTIC
HDIO_SET_ACOUSTIC
HDIO_GET_MULTCOUNT
HDIO_SET_MULTCOUNT
HDIO_GET_NOWERR
HDIO_SET_NOWERR
#endif
return -EINVAL;
}
static void idedisk_setup (ide_drive_t *drive)
{
int i;
struct hd_driveid *id = drive->id;
unsigned long capacity;
idedisk_add_settings(drive);
if (drive->id_read == 0)
return;
/*
* CompactFlash cards and their brethern look just like hard drives
* to us, but they are removable and don't have a doorlock mechanism.
*/
if (drive->removable && !(drive->is_flash)) {
/*
* Removable disks (eg. SYQUEST); ignore 'WD' drives
*/
if (id->model[0] != 'W' || id->model[1] != 'D') {
drive->doorlocking = 1;
}
}
for (i = 0; i < MAX_DRIVES; ++i) {
ide_hwif_t *hwif = HWIF(drive);
if (drive != &hwif->drives[i]) continue;
hwif->gd->de_arr[i] = drive->de;
if (drive->removable)
hwif->gd->flags[i] |= GENHD_FL_REMOVABLE;
break;
}
#if 1
(void) probe_lba_addressing(drive, 1);
#else
/* if using 48-bit addressing bump the request size up */
if (probe_lba_addressing(drive, 1))
blk_queue_max_sectors(&drive->queue, 2048);
#endif
/* Extract geometry if we did not already have one for the drive */
if (!drive->cyl || !drive->head || !drive->sect) {
drive->cyl = drive->bios_cyl = id->cyls;
drive->head = drive->bios_head = id->heads;
drive->sect = drive->bios_sect = id->sectors;
}
/* Handle logical geometry translation by the drive */
if ((id->field_valid & 1) && id->cur_cyls &&
id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
drive->cyl = id->cur_cyls;
drive->head = id->cur_heads;
drive->sect = id->cur_sectors;
}
/* Use physical geometry if what we have still makes no sense */
if (drive->head > 16 && id->heads && id->heads <= 16) {
drive->cyl = id->cyls;
drive->head = id->heads;
drive->sect = id->sectors;
}
/* calculate drive capacity, and select LBA if possible */
init_idedisk_capacity (drive);
/*
* if possible, give fdisk access to more of the drive,
* by correcting bios_cyls:
*/
capacity = idedisk_capacity (drive);
if ((capacity >= (drive->bios_cyl * drive->bios_sect *
drive->bios_head)) &&
(!drive->forced_geom) && drive->bios_sect && drive->bios_head)
drive->bios_cyl = (capacity / drive->bios_sect) /
drive->bios_head;
printk (KERN_INFO "%s: %ld sectors", drive->name, capacity);
/* Give size in megabytes (MB), not mebibytes (MiB). */
/* We compute the exact rounded value, avoiding overflow. */
printk (" (%ld MB)", (capacity - capacity/625 + 974)/1950);
/* Only print cache size when it was specified */
if (id->buf_size)
printk (" w/%dKiB Cache", id->buf_size/2);
printk(", CHS=%d/%d/%d",
drive->bios_cyl, drive->bios_head, drive->bios_sect);
#ifdef CONFIG_BLK_DEV_IDEDMA
if (drive->using_dma)
(void) HWIF(drive)->ide_dma_verbose(drive);
#endif /* CONFIG_BLK_DEV_IDEDMA */
printk("\n");
drive->mult_count = 0;
if (id->max_multsect) {
id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect :
0;
id->multsect_valid = id->multsect ? 1 : 0;
drive->mult_req = id->multsect_valid ? id->max_multsect :
INITIAL_MULT_COUNT;
drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
}
drive->no_io_32bit = id->dword_io ? 1 : 0;
if (drive->id->cfs_enable_2 & 0x3000)
write_cache(drive, (id->cfs_enable_2 & 0x3000));
}
static int idedisk_cleanup(ide_drive_t *drive)
{
ide_cacheflush_p(drive);
return ide_unregister_subdriver(drive);
}
int idedisk_init (void);
int idedisk_attach(ide_drive_t *drive);
/*
* IDE subdriver functions, registered with ide.c
*/
static ide_driver_t idedisk_driver = {
name: "ide-disk",
version: IDEDISK_VERSION,
media: ide_disk,
busy: 0,
supports_dma: 1,
supports_dsc_overlap: 0,
cleanup: idedisk_cleanup,
standby: do_idedisk_standby,
suspend: do_idedisk_suspend,
resume: do_idedisk_resume,
flushcache: do_idedisk_flushcache,
do_request: ide_do_rw_disk,
end_request: idedisk_end_request,
sense: idedisk_dump_status,
error: idedisk_error,
abort: idedisk_abort,
ioctl: idedisk_ioctl,
open: idedisk_open,
release: idedisk_release,
media_change: idedisk_media_change,
revalidate: idedisk_revalidate,
pre_reset: idedisk_pre_reset,
capacity: idedisk_capacity,
special: idedisk_special,
proc: idedisk_proc,
init: idedisk_init,
attach: idedisk_attach,
ata_prebuilder: NULL,
atapi_prebuilder: NULL,
};
static ide_module_t idedisk_module = {
IDE_DRIVER_MODULE,
idedisk_init,
&idedisk_driver,
NULL
};
MODULE_DESCRIPTION("ATA DISK Driver");
int idedisk_attach (ide_drive_t *drive)
{
int ret = 0;
MOD_INC_USE_COUNT;
if (ide_register_subdriver(drive,
&idedisk_driver, IDE_SUBDRIVER_VERSION)) {
printk(KERN_ERR "ide-disk: %s: Failed to register the "
"driver with ide.c\n", drive->name);
ret= 1;
goto bye_game_over;
}
DRIVER(drive)->busy++;
idedisk_setup(drive);
if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
drive->name, drive->head);
(void) idedisk_cleanup(drive);
ret= 1;
}
DRIVER(drive)->busy--;
bye_game_over:
MOD_DEC_USE_COUNT;
return ret;
}
static void __exit idedisk_exit (void)
{
ide_drive_t *drive;
int failed = 0;
while ((drive = ide_scan_devices(ide_disk, idedisk_driver.name,
&idedisk_driver, failed)) != NULL) {
if (idedisk_cleanup (drive)) {
printk(KERN_ERR "%s: cleanup_module() called while "
"still busy\n", drive->name);
failed++;
}
#ifdef CONFIG_PROC_FS
/* We must remove proc entries defined in this module.
* Otherwise we oops while accessing these entries
*/
if (drive->proc)
ide_remove_proc_entries(drive->proc, idedisk_proc);
#endif
}
ide_unregister_module(&idedisk_module);
}
int idedisk_init (void)
{
#ifdef CLASSIC_BUILTINS_METHOD
ide_drive_t *drive;
int failed = 0;
#endif /* CLASSIC_BUILTINS_METHOD */
MOD_INC_USE_COUNT;
#ifdef CLASSIC_BUILTINS_METHOD
while ((drive = ide_scan_devices(ide_disk,
idedisk_driver.name, NULL, failed++)) != NULL) {
if (ide_register_subdriver(drive,
&idedisk_driver, IDE_SUBDRIVER_VERSION)) {
printk(KERN_ERR "ide-disk: %s: Failed to register "
"the driver with ide.c\n", drive->name);
continue;
}
DRIVER(drive)->busy++;
idedisk_setup(drive);
if ((!drive->head || drive->head > 16) &&
(!drive->select.b.lba)) {
printk(KERN_ERR "%s: INVALID GEOMETRY: %d "
"PHYSICAL HEADS?\n", drive->name, drive->head);
(void) idedisk_cleanup(drive);
DRIVER(drive)->busy--;
continue;
}
DRIVER(drive)->busy--;
failed--;
}
#endif /* CLASSIC_BUILTINS_METHOD */
ide_register_module(&idedisk_module);
MOD_DEC_USE_COUNT;
return 0;
}
ide_startstop_t panic_box(ide_drive_t *drive)
{
#if 0
panic("%s: Attempted to corrupt something: ide operation "
#else
printk(KERN_ERR "%s: Attempted to corrupt something: ide operation "
#endif
"was pending accross suspend/resume.\n", drive->name);
return ide_stopped;
}
int ide_disks_busy(void)
{
int i;
for (i=0; i<MAX_HWIFS; i++) {
struct hwgroup_s *hwgroup = ide_hwifs[i].hwgroup;
if (!hwgroup) continue;
if ((hwgroup->handler) && (hwgroup->handler != panic_box))
return 1;
}
return 0;
}
void ide_disk_suspend(void)
{
int i;
while (ide_disks_busy()) {
printk("*");
schedule();
}
for (i=0; i<MAX_HWIFS; i++) {
struct hwgroup_s *hwgroup = ide_hwifs[i].hwgroup;
if (!hwgroup) continue;
hwgroup->handler_save = hwgroup->handler;
hwgroup->handler = panic_box;
}
driver_blocked = 1;
if (ide_disks_busy())
panic("How did you get that request through?!");
}
/* unsuspend and resume should be equal in the ideal world */
void ide_disk_unsuspend(void)
{
int i;
for (i=0; i<MAX_HWIFS; i++) {
struct hwgroup_s *hwgroup = ide_hwifs[i].hwgroup;
if (!hwgroup) continue;
hwgroup->handler = NULL; /* hwgroup->handler_save; */
hwgroup->handler_save = NULL;
}
driver_blocked = 0;
}
void ide_disk_resume(void)
{
int i;
for (i=0; i<MAX_HWIFS; i++) {
struct hwgroup_s *hwgroup = ide_hwifs[i].hwgroup;
if (!hwgroup) continue;
if (hwgroup->handler != panic_box)
panic("Handler was not set to panic?");
hwgroup->handler_save = NULL;
hwgroup->handler = NULL;
}
driver_blocked = 0;
}
module_init(idedisk_init);
module_exit(idedisk_exit);
MODULE_LICENSE("GPL");
--
Mladen Gogala
Oracle DBA
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