kernel-ark/drivers/scsi/aic7xxx/aic79xx_proc.c
Hannes Reinecke f89d0a4e1d [SCSI] aic79xx: remove slave_destroy
Even with the latest fixes aic79xx still occasionally triggers the
BUG_ON in slave_destroy. Rather than trying to figure out the various
levels of interaction here I've decided to remove the callback altogether.

The primary reason for the slave_alloc / slave_destroy is to keep an
index of pointers to the sdevs associated with a given target.
However, by changing the arguments to the affected functions slightly
it's possible to avoid the use of that index entirely.
The only performance penalty we'll incur is in writing the
information for /proc/scsi/XXX, as we'll have to recurse over all
available sdevs to find the correct ones. But I doubt that reading
from /proc is in any way time-critical.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-26 09:59:18 -05:00

384 lines
10 KiB
C

/*
* Copyright (c) 2000-2001 Adaptec Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* String handling code courtesy of Gerard Roudier's <groudier@club-internet.fr>
* sym driver.
*
* $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_proc.c#19 $
*/
#include "aic79xx_osm.h"
#include "aic79xx_inline.h"
static void copy_mem_info(struct info_str *info, char *data, int len);
static int copy_info(struct info_str *info, char *fmt, ...);
static void ahd_dump_target_state(struct ahd_softc *ahd,
struct info_str *info,
u_int our_id, char channel,
u_int target_id);
static void ahd_dump_device_state(struct info_str *info,
struct scsi_device *sdev);
static int ahd_proc_write_seeprom(struct ahd_softc *ahd,
char *buffer, int length);
/*
* Table of syncrates that don't follow the "divisible by 4"
* rule. This table will be expanded in future SCSI specs.
*/
static struct {
u_int period_factor;
u_int period; /* in 100ths of ns */
} scsi_syncrates[] = {
{ 0x08, 625 }, /* FAST-160 */
{ 0x09, 1250 }, /* FAST-80 */
{ 0x0a, 2500 }, /* FAST-40 40MHz */
{ 0x0b, 3030 }, /* FAST-40 33MHz */
{ 0x0c, 5000 } /* FAST-20 */
};
/*
* Return the frequency in kHz corresponding to the given
* sync period factor.
*/
static u_int
ahd_calc_syncsrate(u_int period_factor)
{
int i;
/* See if the period is in the "exception" table */
for (i = 0; i < ARRAY_SIZE(scsi_syncrates); i++) {
if (period_factor == scsi_syncrates[i].period_factor) {
/* Period in kHz */
return (100000000 / scsi_syncrates[i].period);
}
}
/*
* Wasn't in the table, so use the standard
* 4 times conversion.
*/
return (10000000 / (period_factor * 4 * 10));
}
static void
copy_mem_info(struct info_str *info, char *data, int len)
{
if (info->pos + len > info->offset + info->length)
len = info->offset + info->length - info->pos;
if (info->pos + len < info->offset) {
info->pos += len;
return;
}
if (info->pos < info->offset) {
off_t partial;
partial = info->offset - info->pos;
data += partial;
info->pos += partial;
len -= partial;
}
if (len > 0) {
memcpy(info->buffer, data, len);
info->pos += len;
info->buffer += len;
}
}
static int
copy_info(struct info_str *info, char *fmt, ...)
{
va_list args;
char buf[256];
int len;
va_start(args, fmt);
len = vsprintf(buf, fmt, args);
va_end(args);
copy_mem_info(info, buf, len);
return (len);
}
void
ahd_format_transinfo(struct info_str *info, struct ahd_transinfo *tinfo)
{
u_int speed;
u_int freq;
u_int mb;
if (tinfo->period == AHD_PERIOD_UNKNOWN) {
copy_info(info, "Renegotiation Pending\n");
return;
}
speed = 3300;
freq = 0;
if (tinfo->offset != 0) {
freq = ahd_calc_syncsrate(tinfo->period);
speed = freq;
}
speed *= (0x01 << tinfo->width);
mb = speed / 1000;
if (mb > 0)
copy_info(info, "%d.%03dMB/s transfers", mb, speed % 1000);
else
copy_info(info, "%dKB/s transfers", speed);
if (freq != 0) {
int printed_options;
printed_options = 0;
copy_info(info, " (%d.%03dMHz", freq / 1000, freq % 1000);
if ((tinfo->ppr_options & MSG_EXT_PPR_RD_STRM) != 0) {
copy_info(info, " RDSTRM");
printed_options++;
}
if ((tinfo->ppr_options & MSG_EXT_PPR_DT_REQ) != 0) {
copy_info(info, "%s", printed_options ? "|DT" : " DT");
printed_options++;
}
if ((tinfo->ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
copy_info(info, "%s", printed_options ? "|IU" : " IU");
printed_options++;
}
if ((tinfo->ppr_options & MSG_EXT_PPR_RTI) != 0) {
copy_info(info, "%s",
printed_options ? "|RTI" : " RTI");
printed_options++;
}
if ((tinfo->ppr_options & MSG_EXT_PPR_QAS_REQ) != 0) {
copy_info(info, "%s",
printed_options ? "|QAS" : " QAS");
printed_options++;
}
}
if (tinfo->width > 0) {
if (freq != 0) {
copy_info(info, ", ");
} else {
copy_info(info, " (");
}
copy_info(info, "%dbit)", 8 * (0x01 << tinfo->width));
} else if (freq != 0) {
copy_info(info, ")");
}
copy_info(info, "\n");
}
static void
ahd_dump_target_state(struct ahd_softc *ahd, struct info_str *info,
u_int our_id, char channel, u_int target_id)
{
struct scsi_target *starget;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
int lun;
tinfo = ahd_fetch_transinfo(ahd, channel, our_id,
target_id, &tstate);
copy_info(info, "Target %d Negotiation Settings\n", target_id);
copy_info(info, "\tUser: ");
ahd_format_transinfo(info, &tinfo->user);
starget = ahd->platform_data->starget[target_id];
if (starget == NULL)
return;
copy_info(info, "\tGoal: ");
ahd_format_transinfo(info, &tinfo->goal);
copy_info(info, "\tCurr: ");
ahd_format_transinfo(info, &tinfo->curr);
for (lun = 0; lun < AHD_NUM_LUNS; lun++) {
struct scsi_device *dev;
dev = scsi_device_lookup_by_target(starget, lun);
if (dev == NULL)
continue;
ahd_dump_device_state(info, dev);
}
}
static void
ahd_dump_device_state(struct info_str *info, struct scsi_device *sdev)
{
struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
copy_info(info, "\tChannel %c Target %d Lun %d Settings\n",
sdev->sdev_target->channel + 'A',
sdev->sdev_target->id, sdev->lun);
copy_info(info, "\t\tCommands Queued %ld\n", dev->commands_issued);
copy_info(info, "\t\tCommands Active %d\n", dev->active);
copy_info(info, "\t\tCommand Openings %d\n", dev->openings);
copy_info(info, "\t\tMax Tagged Openings %d\n", dev->maxtags);
copy_info(info, "\t\tDevice Queue Frozen Count %d\n", dev->qfrozen);
}
static int
ahd_proc_write_seeprom(struct ahd_softc *ahd, char *buffer, int length)
{
ahd_mode_state saved_modes;
int have_seeprom;
u_long s;
int paused;
int written;
/* Default to failure. */
written = -EINVAL;
ahd_lock(ahd, &s);
paused = ahd_is_paused(ahd);
if (!paused)
ahd_pause(ahd);
saved_modes = ahd_save_modes(ahd);
ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
if (length != sizeof(struct seeprom_config)) {
printf("ahd_proc_write_seeprom: incorrect buffer size\n");
goto done;
}
have_seeprom = ahd_verify_cksum((struct seeprom_config*)buffer);
if (have_seeprom == 0) {
printf("ahd_proc_write_seeprom: cksum verification failed\n");
goto done;
}
have_seeprom = ahd_acquire_seeprom(ahd);
if (!have_seeprom) {
printf("ahd_proc_write_seeprom: No Serial EEPROM\n");
goto done;
} else {
u_int start_addr;
if (ahd->seep_config == NULL) {
ahd->seep_config = malloc(sizeof(*ahd->seep_config),
M_DEVBUF, M_NOWAIT);
if (ahd->seep_config == NULL) {
printf("aic79xx: Unable to allocate serial "
"eeprom buffer. Write failing\n");
goto done;
}
}
printf("aic79xx: Writing Serial EEPROM\n");
start_addr = 32 * (ahd->channel - 'A');
ahd_write_seeprom(ahd, (u_int16_t *)buffer, start_addr,
sizeof(struct seeprom_config)/2);
ahd_read_seeprom(ahd, (uint16_t *)ahd->seep_config,
start_addr, sizeof(struct seeprom_config)/2,
/*ByteStream*/FALSE);
ahd_release_seeprom(ahd);
written = length;
}
done:
ahd_restore_modes(ahd, saved_modes);
if (!paused)
ahd_unpause(ahd);
ahd_unlock(ahd, &s);
return (written);
}
/*
* Return information to handle /proc support for the driver.
*/
int
ahd_linux_proc_info(struct Scsi_Host *shost, char *buffer, char **start,
off_t offset, int length, int inout)
{
struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
struct info_str info;
char ahd_info[256];
u_int max_targ;
u_int i;
int retval;
/* Has data been written to the file? */
if (inout == TRUE) {
retval = ahd_proc_write_seeprom(ahd, buffer, length);
goto done;
}
if (start)
*start = buffer;
info.buffer = buffer;
info.length = length;
info.offset = offset;
info.pos = 0;
copy_info(&info, "Adaptec AIC79xx driver version: %s\n",
AIC79XX_DRIVER_VERSION);
copy_info(&info, "%s\n", ahd->description);
ahd_controller_info(ahd, ahd_info);
copy_info(&info, "%s\n", ahd_info);
copy_info(&info, "Allocated SCBs: %d, SG List Length: %d\n\n",
ahd->scb_data.numscbs, AHD_NSEG);
max_targ = 16;
if (ahd->seep_config == NULL)
copy_info(&info, "No Serial EEPROM\n");
else {
copy_info(&info, "Serial EEPROM:\n");
for (i = 0; i < sizeof(*ahd->seep_config)/2; i++) {
if (((i % 8) == 0) && (i != 0)) {
copy_info(&info, "\n");
}
copy_info(&info, "0x%.4x ",
((uint16_t*)ahd->seep_config)[i]);
}
copy_info(&info, "\n");
}
copy_info(&info, "\n");
if ((ahd->features & AHD_WIDE) == 0)
max_targ = 8;
for (i = 0; i < max_targ; i++) {
ahd_dump_target_state(ahd, &info, ahd->our_id, 'A',
/*target_id*/i);
}
retval = info.pos > info.offset ? info.pos - info.offset : 0;
done:
return (retval);
}