- 根目录:
- drivers
- ide
- ide-taskfile.c
/*
* Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org>
* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2001-2002 Klaus Smolin
* IBM Storage Technology Division
* Copyright (C) 2003-2004, 2007 Bartlomiej Zolnierkiewicz
*
* The big the bad and the ugly.
*/
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/scatterlist.h>
#include <linux/uaccess.h>
#include <asm/io.h>
void ide_tf_readback(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
/* Be sure we're looking at the low order bytes */
tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
tp_ops->tf_read(drive, &cmd->tf, cmd->valid.in.tf);
if (cmd->tf_flags & IDE_TFLAG_LBA48) {
tp_ops->write_devctl(hwif, ATA_HOB | ATA_DEVCTL_OBS);
tp_ops->tf_read(drive, &cmd->hob, cmd->valid.in.hob);
}
}
void ide_tf_dump(const char *s, struct ide_cmd *cmd)
{
#ifdef DEBUG
printk("%s: tf: feat 0x%02x nsect 0x%02x lbal 0x%02x "
"lbam 0x%02x lbah 0x%02x dev 0x%02x cmd 0x%02x\n",
s, cmd->tf.feature, cmd->tf.nsect,
cmd->tf.lbal, cmd->tf.lbam, cmd->tf.lbah,
cmd->tf.device, cmd->tf.command);
printk("%s: hob: nsect 0x%02x lbal 0x%02x lbam 0x%02x lbah 0x%02x\n",
s, cmd->hob.nsect, cmd->hob.lbal, cmd->hob.lbam, cmd->hob.lbah);
#endif
}
int taskfile_lib_get_identify(ide_drive_t *drive, u8 *buf)
{
struct ide_cmd cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.tf.nsect = 0x01;
if (drive->media == ide_disk)
cmd.tf.command = ATA_CMD_ID_ATA;
else
cmd.tf.command = ATA_CMD_ID_ATAPI;
cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
cmd.protocol = ATA_PROT_PIO;
return ide_raw_taskfile(drive, &cmd, buf, 1);
}
static ide_startstop_t task_no_data_intr(ide_drive_t *);
static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct ide_cmd *);
static ide_startstop_t task_pio_intr(ide_drive_t *);
ide_startstop_t do_rw_taskfile(ide_drive_t *drive, struct ide_cmd *orig_cmd)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_cmd *cmd = &hwif->cmd;
struct ide_taskfile *tf = &cmd->tf;
ide_handler_t *handler = NULL;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
const struct ide_dma_ops *dma_ops = hwif->dma_ops;
if (orig_cmd->protocol == ATA_PROT_PIO &&
(orig_cmd->tf_flags & IDE_TFLAG_MULTI_PIO) &&
drive->mult_count == 0) {
pr_err("%s: multimode not set!\n", drive->name);
return ide_stopped;
}
if (orig_cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
orig_cmd->ftf_flags |= IDE_FTFLAG_SET_IN_FLAGS;
memcpy(cmd, orig_cmd, sizeof(*cmd));
if ((cmd->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) {
ide_tf_dump(drive->name, cmd);
tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
u8 data[2] = { cmd->tf.data, cmd->hob.data };
tp_ops->output_data(drive, cmd, data, 2);
}
if (cmd->valid.out.tf & IDE_VALID_DEVICE) {
u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ?
0xE0 : 0xEF;
if (!(cmd->ftf_flags & IDE_FTFLAG_FLAGGED))
cmd->tf.device &= HIHI;
cmd->tf.device |= drive->select;
}
tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob);
tp_ops->tf_load(drive, &cmd->tf, cmd->valid.out.tf);
}
switch (cmd->protocol) {
case ATA_PROT_PIO:
if (cmd->tf_flags & IDE_TFLAG_WRITE) {
tp_ops->exec_command(hwif, tf->command);
ndelay(400); /* FIXME */
return pre_task_out_intr(drive, cmd);
}
handler = task_pio_intr;
/* fall-through */
case ATA_PROT_NODATA:
if (handler == NULL)
handler = task_no_data_intr;
ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE);
return ide_started;
case ATA_PROT_DMA:
if (ide_dma_prepare(drive, cmd))
return ide_stopped;
hwif->expiry = dma_ops->dma_timer_expiry;
ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD);
dma_ops->dma_start(drive);
default:
return ide_started;
}
}
EXPORT_SYMBOL_GPL(do_rw_taskfile);
static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_cmd *cmd = &hwif->cmd;
struct ide_taskfile *tf = &cmd->tf;
int custom = (cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) ? 1 : 0;
int retries = (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) ? 5 : 1;
u8 stat;
local_irq_enable_in_hardirq();
while (1) {
stat = hwif->tp_ops->read_status(hwif);
if ((stat & ATA_BUSY) == 0 || retries-- == 0)
break;
udelay(10);
};
if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
if (custom && tf->command == ATA_CMD_SET_MULTI) {
drive->mult_req = drive->mult_count = 0;
drive->special_flags |= IDE_SFLAG_RECALIBRATE;
(void)ide_dump_status(drive, __func__, stat);
return ide_stopped;
} else if (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) {
if ((stat & (ATA_ERR | ATA_DRQ)) == 0) {
ide_set_handler(drive, &task_no_data_intr,
WAIT_WORSTCASE);
return ide_started;
}
}
return ide_error(drive, "task_no_data_intr", stat);
}
if (custom && tf->command == ATA_CMD_SET_MULTI)
drive->mult_count = drive->mult_req;
if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE ||
tf->command == ATA_CMD_CHK_POWER) {
struct request *rq = hwif->rq;
if (blk_pm_request(rq))
ide_complete_pm_rq(drive, rq);
else
ide_finish_cmd(drive, cmd, stat);
}
return ide_stopped;
}
static u8 wait_drive_not_busy(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
int retries;
u8 stat;
/*
* Last sector was transferred, wait until device is ready. This can
* take up to 6 ms on some ATAPI devices, so we will wait max 10 ms.
*/
for (retries = 0; retries < 1000; retries++) {
stat = hwif->tp_ops->read_status(hwif);
if (stat & ATA_BUSY)
udelay(10);
else
break;
}
if (stat & ATA_BUSY)
pr_err("%s: drive still BUSY!\n", drive->name);
return stat;
}
void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write, unsigned int len)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
struct scatterlist *cursg = cmd->cursg;
unsigned long uninitialized_var(flags);
struct page *page;
unsigned int offset;
u8 *buf;
cursg = cmd->cursg;
if (cursg == NULL)
cursg = cmd->cursg = sg;
while (len) {
unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
int page_is_high;
page = sg_page(cursg);
offset = cursg->offset + cmd->cursg_ofs;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset));
page_is_high = PageHighMem(page);
if (page_is_high)
local_irq_save(flags);
buf = kmap_atomic(page) + offset;
cmd->nleft -= nr_bytes;
cmd->cursg_ofs += nr_bytes;
if (cmd->cursg_ofs == cursg->length) {
cursg = cmd->cursg = sg_next(cmd->cursg);
cmd->cursg_ofs = 0;
}
/* do the actual data transfer */
if (write)
hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
else
hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
kunmap_atomic(buf);
if (page_is_high)
local_irq_restore(flags);
len -= nr_bytes;
}
}
EXPORT_SYMBOL_GPL(ide_pio_bytes);
static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write)
{
unsigned int nr_bytes;
u8 saved_io_32bit = drive->io_32bit;
if (cmd->tf_flags & IDE_TFLAG_FS)
cmd->rq->errors = 0;
if (cmd->tf_flags & IDE_TFLAG_IO_16BIT)
drive->io_32bit = 0;
touch_softlockup_watchdog();
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
else
nr_bytes = SECTOR_SIZE;
ide_pio_bytes(drive, cmd, write, nr_bytes);
drive->io_32bit = saved_io_32bit;
}
static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
{
if (cmd->tf_flags & IDE_TFLAG_FS) {
int nr_bytes = cmd->nbytes - cmd->nleft;
if (cmd->protocol == ATA_PROT_PIO &&
((cmd->tf_flags & IDE_TFLAG_WRITE) || cmd->nleft == 0)) {
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
nr_bytes -= drive->mult_count << 9;
else
nr_bytes -= SECTOR_SIZE;
}
if (nr_bytes > 0)
ide_complete_rq(drive, 0, nr_bytes);
}
}
void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat)
{
struct request *rq = drive->hwif->rq;
u8 err = ide_read_error(drive), nsect = cmd->tf.nsect;
u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER);
ide_complete_cmd(drive, cmd, stat, err);
rq->errors = err;
if (err == 0 && set_xfer) {
ide_set_xfer_rate(drive, nsect);
ide_driveid_update(drive);
}
ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq));
}
/*
* Handler for command with PIO data phase.
*/
static ide_startstop_t task_pio_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_cmd *cmd = &drive->hwif->cmd;
u8 stat = hwif->tp_ops->read_status(hwif);
u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
if (write == 0) {
/* Error? */
if (stat & ATA_ERR)
goto out_err;
/* Didn't want any data? Odd. */
if ((stat & ATA_DRQ) == 0) {
/* Command all done? */
if (OK_STAT(stat, ATA_DRDY, ATA_BUSY))
goto out_end;
/* Assume it was a spurious irq */
goto out_wait;
}
} else {
if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
goto out_err;
/* Deal with unexpected ATA data phase. */
if (((stat & ATA_DRQ) == 0) ^ (cmd->nleft == 0))
goto out_err;
}
if (write && cmd->nleft == 0)
goto out_end;
/* Still data left to transfer. */
ide_pio_datablock(drive, cmd, write);
/* Are we done? Check status and finish transfer. */
if (write == 0 && cmd->nleft == 0) {
stat = wait_drive_not_busy(drive);
if (!OK_STAT(stat, 0, BAD_STAT))
goto out_err;
goto out_end;
}
out_wait:
/* Still data left to transfer. */
ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
return ide_started;
out_end:
if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
ide_finish_cmd(drive, cmd, stat);
else
ide_complete_rq(drive, 0, blk_rq_sectors(cmd->rq) << 9);
return ide_stopped;
out_err:
ide_error_cmd(drive, cmd);
return ide_error(drive, __func__, stat);
}
static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
struct ide_cmd *cmd)
{
ide_startstop_t startstop;
if (ide_wait_stat(&startstop, drive, ATA_DRQ,
drive->bad_wstat, WAIT_DRQ)) {
pr_err("%s: no DRQ after issuing %sWRITE%s\n", drive->name,
(cmd->tf_flags & IDE_TFLAG_MULTI_PIO) ? "MULT" : "",
(drive->dev_flags & IDE_DFLAG_LBA48) ? "_EXT" : "");
return startstop;
}
if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
local_irq_disable();
ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
ide_pio_datablock(drive, cmd, 1);
return ide_started;
}
int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
u16 nsect)
{
struct request *rq;
int error;
int rw = !(cmd->tf_flags & IDE_TFLAG_WRITE) ? READ : WRITE;
rq = blk_get_request(drive->queue, rw, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
/*
* (ks) We transfer currently only whole sectors.
* This is suffient for now. But, it would be great,
* if we would find a solution to transfer any size.
* To support special commands like READ LONG.
*/
if (nsect) {
error = blk_rq_map_kern(drive->queue, rq, buf,
nsect * SECTOR_SIZE, __GFP_WAIT);
if (error)
goto put_req;
}
rq->special = cmd;
cmd->rq = rq;
error = blk_execute_rq(drive->queue, NULL, rq, 0);
put_req:
blk_put_request(rq);
return error;
}
EXPORT_SYMBOL(ide_raw_taskfile);
int ide_no_data_taskfile(ide_drive_t *drive, struct ide_cmd *cmd)
{
cmd->protocol = ATA_PROT_NODATA;
return ide_raw_taskfile(drive, cmd, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_no_data_taskfile);
#ifdef CONFIG_IDE_TASK_IOCTL
int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
{
ide_task_request_t *req_task;
struct ide_cmd cmd;
u8 *outbuf = NULL;
u8 *inbuf = NULL;
u8 *data_buf = NULL;
int err = 0;
int tasksize = sizeof(struct ide_task_request_s);
unsigned int taskin = 0;
unsigned int taskout = 0;
u16 nsect = 0;
char __user *buf = (char __user *)arg;
req_task = memdup_user(buf, tasksize);
if (IS_ERR(req_task))
return PTR_ERR(req_task);
taskout = req_task->out_size;
taskin = req_task->in_size;
if (taskin > 65536 || taskout > 65536) {
err = -EINVAL;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
outbuf = kzalloc(taskout, GFP_KERNEL);
if (outbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(outbuf, buf + outtotal, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
inbuf = kzalloc(taskin, GFP_KERNEL);
if (inbuf == NULL) {
err = -ENOMEM;
goto abort;
}
if (copy_from_user(inbuf, buf + intotal, taskin)) {
err = -EFAULT;
goto abort;
}
}
memset(&cmd, 0, sizeof(cmd));
memcpy(&cmd.hob, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2);
memcpy(&cmd.tf, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
cmd.valid.out.tf = IDE_VALID_DEVICE;
cmd.valid.in.tf = IDE_VALID_DEVICE | IDE_VALID_IN_TF;
cmd.tf_flags = IDE_TFLAG_IO_16BIT;
if (drive->dev_flags & IDE_DFLAG_LBA48) {
cmd.tf_flags |= IDE_TFLAG_LBA48;
cmd.valid.in.hob = IDE_VALID_IN_HOB;
}
if (req_task->out_flags.all) {
cmd.ftf_flags |= IDE_FTFLAG_FLAGGED;
if (req_task->out_flags.b.data)
cmd.ftf_flags |= IDE_FTFLAG_OUT_DATA;
if (req_task->out_flags.b.nsector_hob)
cmd.valid.out.hob |= IDE_VALID_NSECT;
if (req_task->out_flags.b.sector_hob)
cmd.valid.out.hob |= IDE_VALID_LBAL;
if (req_task->out_flags.b.lcyl_hob)
cmd.valid.out.hob |= IDE_VALID_LBAM;
if (req_task->out_flags.b.hcyl_hob)
cmd.valid.out.hob |= IDE_VALID_LBAH;
if (req_task->out_flags.b.error_feature)
cmd.valid.out.tf |= IDE_VALID_FEATURE;
if (req_task->out_flags.b.nsector)
cmd.valid.out.tf |= IDE_VALID_NSECT;
if (req_task->out_flags.b.sector)
cmd.valid.out.tf |= IDE_VALID_LBAL;
if (req_task->out_flags.b.lcyl)
cmd.valid.out.tf |= IDE_VALID_LBAM;
if (req_task->out_flags.b.hcyl)
cmd.valid.out.tf |= IDE_VALID_LBAH;
} else {
cmd.valid.out.tf |= IDE_VALID_OUT_TF;
if (cmd.tf_flags & IDE_TFLAG_LBA48)
cmd.valid.out.hob |= IDE_VALID_OUT_HOB;
}
if (req_task->in_flags.b.data)
cmd.ftf_flags |= IDE_FTFLAG_IN_DATA;
if (req_task->req_cmd == IDE_DRIVE_TASK_RAW_WRITE) {
/* fixup data phase if needed */
if (req_task->data_phase == TASKFILE_IN_DMAQ ||
req_task->data_phase == TASKFILE_IN_DMA)
cmd.tf_flags |= IDE_TFLAG_WRITE;
}
cmd.protocol = ATA_PROT_DMA;
switch (req_task->data_phase) {
case TASKFILE_MULTI_OUT:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
pr_err("%s: %s Multimode Write multcount is not set\n",
drive->name, __func__);
err = -EPERM;
goto abort;
}
cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
/* fall through */
case TASKFILE_OUT:
cmd.protocol = ATA_PROT_PIO;
/* fall through */
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
cmd.tf_flags |= IDE_TFLAG_WRITE;
nsect = taskout / SECTOR_SIZE;
data_buf = outbuf;
break;
case TASKFILE_MULTI_IN:
if (!drive->mult_count) {
/* (hs): give up if multcount is not set */
pr_err("%s: %s Multimode Read multcount is not set\n",
drive->name, __func__);
err = -EPERM;
goto abort;
}
cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
/* fall through */
case TASKFILE_IN:
cmd.protocol = ATA_PROT_PIO;
/* fall through */
case TASKFILE_IN_DMAQ:
case TASKFILE_IN_DMA:
nsect = taskin / SECTOR_SIZE;
data_buf = inbuf;
break;
case TASKFILE_NO_DATA:
cmd.protocol = ATA_PROT_NODATA;
break;
default:
err = -EFAULT;
goto abort;
}
if (req_task->req_cmd == IDE_DRIVE_TASK_NO_DATA)
nsect = 0;
else if (!nsect) {
nsect = (cmd.hob.nsect << 8) | cmd.tf.nsect;
if (!nsect) {
pr_err("%s: in/out command without data\n",
drive->name);
err = -EFAULT;
goto abort;
}
}
err = ide_raw_taskfile(drive, &cmd, data_buf, nsect);
memcpy(req_task->hob_ports, &cmd.hob, HDIO_DRIVE_HOB_HDR_SIZE - 2);
memcpy(req_task->io_ports, &cmd.tf, HDIO_DRIVE_TASK_HDR_SIZE);
if ((cmd.ftf_flags & IDE_FTFLAG_SET_IN_FLAGS) &&
req_task->in_flags.all == 0) {
req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
if (drive->dev_flags & IDE_DFLAG_LBA48)
req_task->in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
}
if (copy_to_user(buf, req_task, tasksize)) {
err = -EFAULT;
goto abort;
}
if (taskout) {
int outtotal = tasksize;
if (copy_to_user(buf + outtotal, outbuf, taskout)) {
err = -EFAULT;
goto abort;
}
}
if (taskin) {
int intotal = tasksize + taskout;
if (copy_to_user(buf + intotal, inbuf, taskin)) {
err = -EFAULT;
goto abort;
}
}
abort:
kfree(req_task);
kfree(outbuf);
kfree(inbuf);
return err;
}
#endif