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android-kvm / linux / ca062f8df5d13e3a5c029449a12c20ac5069c094 / . / drivers / scsi / aic7xxx / aic79xx_osm.c
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/*
* Adaptec AIC79xx device driver for Linux.
*
* $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
*
* --------------------------------------------------------------------------
* Copyright (c) 1994-2000 Justin T. Gibbs.
* Copyright (c) 1997-1999 Doug Ledford
* Copyright (c) 2000-2003 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.
*/
#include "aic79xx_osm.h"
#include "aic79xx_inline.h"
#include <scsi/scsicam.h>
static struct scsi_transport_template *ahd_linux_transport_template = NULL;
#include <linux/init.h> /* __setup */
#include <linux/mm.h> /* For fetching system memory size */
#include <linux/blkdev.h> /* For block_size() */
#include <linux/delay.h> /* For ssleep/msleep */
#include <linux/device.h>
#include <linux/slab.h>
/*
* Bucket size for counting good commands in between bad ones.
*/
#define AHD_LINUX_ERR_THRESH 1000
/*
* Set this to the delay in seconds after SCSI bus reset.
* Note, we honor this only for the initial bus reset.
* The scsi error recovery code performs its own bus settle
* delay handling for error recovery actions.
*/
#ifdef CONFIG_AIC79XX_RESET_DELAY_MS
#define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
#else
#define AIC79XX_RESET_DELAY 5000
#endif
/*
* To change the default number of tagged transactions allowed per-device,
* add a line to the lilo.conf file like:
* append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
* which will result in the first four devices on the first two
* controllers being set to a tagged queue depth of 32.
*
* The tag_commands is an array of 16 to allow for wide and twin adapters.
* Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
* for channel 1.
*/
typedef struct {
uint16_t tag_commands[16]; /* Allow for wide/twin adapters. */
} adapter_tag_info_t;
/*
* Modify this as you see fit for your system.
*
* 0 tagged queuing disabled
* 1 <= n <= 253 n == max tags ever dispatched.
*
* The driver will throttle the number of commands dispatched to a
* device if it returns queue full. For devices with a fixed maximum
* queue depth, the driver will eventually determine this depth and
* lock it in (a console message is printed to indicate that a lock
* has occurred). On some devices, queue full is returned for a temporary
* resource shortage. These devices will return queue full at varying
* depths. The driver will throttle back when the queue fulls occur and
* attempt to slowly increase the depth over time as the device recovers
* from the resource shortage.
*
* In this example, the first line will disable tagged queueing for all
* the devices on the first probed aic79xx adapter.
*
* The second line enables tagged queueing with 4 commands/LUN for IDs
* (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
* driver to attempt to use up to 64 tags for ID 1.
*
* The third line is the same as the first line.
*
* The fourth line disables tagged queueing for devices 0 and 3. It
* enables tagged queueing for the other IDs, with 16 commands/LUN
* for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
* IDs 2, 5-7, and 9-15.
*/
/*
* NOTE: The below structure is for reference only, the actual structure
* to modify in order to change things is just below this comment block.
adapter_tag_info_t aic79xx_tag_info[] =
{
{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
{{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
{{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
};
*/
#ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
#define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
#else
#define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
#endif
#define AIC79XX_CONFIGED_TAG_COMMANDS { \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE, \
AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE \
}
/*
* By default, use the number of commands specified by
* the users kernel configuration.
*/
static adapter_tag_info_t aic79xx_tag_info[] =
{
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS},
{AIC79XX_CONFIGED_TAG_COMMANDS}
};
/*
* The I/O cell on the chip is very configurable in respect to its analog
* characteristics. Set the defaults here; they can be overriden with
* the proper insmod parameters.
*/
struct ahd_linux_iocell_opts
{
uint8_t precomp;
uint8_t slewrate;
uint8_t amplitude;
};
#define AIC79XX_DEFAULT_PRECOMP 0xFF
#define AIC79XX_DEFAULT_SLEWRATE 0xFF
#define AIC79XX_DEFAULT_AMPLITUDE 0xFF
#define AIC79XX_DEFAULT_IOOPTS \
{ \
AIC79XX_DEFAULT_PRECOMP, \
AIC79XX_DEFAULT_SLEWRATE, \
AIC79XX_DEFAULT_AMPLITUDE \
}
#define AIC79XX_PRECOMP_INDEX 0
#define AIC79XX_SLEWRATE_INDEX 1
#define AIC79XX_AMPLITUDE_INDEX 2
static const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
{
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS,
AIC79XX_DEFAULT_IOOPTS
};
/*
* There should be a specific return value for this in scsi.h, but
* it seems that most drivers ignore it.
*/
#define DID_UNDERFLOW DID_ERROR
void
ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
{
printk("(scsi%d:%c:%d:%d): ",
ahd->platform_data->host->host_no,
scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
scb != NULL ? SCB_GET_LUN(scb) : -1);
}
/*
* XXX - these options apply unilaterally to _all_ adapters
* cards in the system. This should be fixed. Exceptions to this
* rule are noted in the comments.
*/
/*
* Skip the scsi bus reset. Non 0 make us skip the reset at startup. This
* has no effect on any later resets that might occur due to things like
* SCSI bus timeouts.
*/
static uint32_t aic79xx_no_reset;
/*
* Should we force EXTENDED translation on a controller.
* 0 == Use whatever is in the SEEPROM or default to off
* 1 == Use whatever is in the SEEPROM or default to on
*/
static uint32_t aic79xx_extended;
/*
* PCI bus parity checking of the Adaptec controllers. This is somewhat
* dubious at best. To my knowledge, this option has never actually
* solved a PCI parity problem, but on certain machines with broken PCI
* chipset configurations, it can generate tons of false error messages.
* It's included in the driver for completeness.
* 0 = Shut off PCI parity check
* non-0 = Enable PCI parity check
*
* NOTE: you can't actually pass -1 on the lilo prompt. So, to set this
* variable to -1 you would actually want to simply pass the variable
* name without a number. That will invert the 0 which will result in
* -1.
*/
static uint32_t aic79xx_pci_parity = ~0;
/*
* There are lots of broken chipsets in the world. Some of them will
* violate the PCI spec when we issue byte sized memory writes to our
* controller. I/O mapped register access, if allowed by the given
* platform, will work in almost all cases.
*/
uint32_t aic79xx_allow_memio = ~0;
/*
* So that we can set how long each device is given as a selection timeout.
* The table of values goes like this:
* 0 - 256ms
* 1 - 128ms
* 2 - 64ms
* 3 - 32ms
* We default to 256ms because some older devices need a longer time
* to respond to initial selection.
*/
static uint32_t aic79xx_seltime;
/*
* Certain devices do not perform any aging on commands. Should the
* device be saturated by commands in one portion of the disk, it is
* possible for transactions on far away sectors to never be serviced.
* To handle these devices, we can periodically send an ordered tag to
* force all outstanding transactions to be serviced prior to a new
* transaction.
*/
static uint32_t aic79xx_periodic_otag;
/* Some storage boxes are using an LSI chip which has a bug making it
* impossible to use aic79xx Rev B chip in 320 speeds. The following
* storage boxes have been reported to be buggy:
* EonStor 3U 16-Bay: U16U-G3A3
* EonStor 2U 12-Bay: U12U-G3A3
* SentinelRAID: 2500F R5 / R6
* SentinelRAID: 2500F R1
* SentinelRAID: 2500F/1500F
* SentinelRAID: 150F
*
* To get around this LSI bug, you can set your board to 160 mode
* or you can enable the SLOWCRC bit.
*/
uint32_t aic79xx_slowcrc;
/*
* Module information and settable options.
*/
static char *aic79xx = NULL;
MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
MODULE_DESCRIPTION("Adaptec AIC790X U320 SCSI Host Bus Adapter driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(AIC79XX_DRIVER_VERSION);
module_param(aic79xx, charp, 0444);
MODULE_PARM_DESC(aic79xx,
"period-delimited options string:\n"
" verbose Enable verbose/diagnostic logging\n"
" allow_memio Allow device registers to be memory mapped\n"
" debug Bitmask of debug values to enable\n"
" no_reset Suppress initial bus resets\n"
" extended Enable extended geometry on all controllers\n"
" periodic_otag Send an ordered tagged transaction\n"
" periodically to prevent tag starvation.\n"
" This may be required by some older disk\n"
" or drives/RAID arrays.\n"
" tag_info:<tag_str> Set per-target tag depth\n"
" global_tag_depth:<int> Global tag depth for all targets on all buses\n"
" slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
" precomp:<pcomp_list> Set the signal precompensation (0-7).\n"
" amplitude:<int> Set the signal amplitude (0-7).\n"
" seltime:<int> Selection Timeout:\n"
" (0/256ms,1/128ms,2/64ms,3/32ms)\n"
" slowcrc Turn on the SLOWCRC bit (Rev B only)\n"
"\n"
" Sample modprobe configuration file:\n"
" # Enable verbose logging\n"
" # Set tag depth on Controller 2/Target 2 to 10 tags\n"
" # Shorten the selection timeout to 128ms\n"
"\n"
" options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
);
static void ahd_linux_handle_scsi_status(struct ahd_softc *,
struct scsi_device *,
struct scb *);
static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
struct scsi_cmnd *cmd);
static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
struct ahd_devinfo *devinfo);
static void ahd_linux_device_queue_depth(struct scsi_device *);
static int ahd_linux_run_command(struct ahd_softc*,
struct ahd_linux_device *,
struct scsi_cmnd *);
static void ahd_linux_setup_tag_info_global(char *p);
static int aic79xx_setup(char *c);
static void ahd_freeze_simq(struct ahd_softc *ahd);
static void ahd_release_simq(struct ahd_softc *ahd);
static int ahd_linux_unit;
/************************** OS Utility Wrappers *******************************/
void ahd_delay(long);
void
ahd_delay(long usec)
{
/*
* udelay on Linux can have problems for
* multi-millisecond waits. Wait at most
* 1024us per call.
*/
while (usec > 0) {
udelay(usec % 1024);
usec -= 1024;
}
}
/***************************** Low Level I/O **********************************/
uint8_t ahd_inb(struct ahd_softc * ahd, long port);
void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
void ahd_outw_atomic(struct ahd_softc * ahd,
long port, uint16_t val);
void ahd_outsb(struct ahd_softc * ahd, long port,
uint8_t *, int count);
void ahd_insb(struct ahd_softc * ahd, long port,
uint8_t *, int count);
uint8_t
ahd_inb(struct ahd_softc * ahd, long port)
{
uint8_t x;
if (ahd->tags[0] == BUS_SPACE_MEMIO) {
x = readb(ahd->bshs[0].maddr + port);
} else {
x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
}
mb();
return (x);
}
#if 0 /* unused */
static uint16_t
ahd_inw_atomic(struct ahd_softc * ahd, long port)
{
uint8_t x;
if (ahd->tags[0] == BUS_SPACE_MEMIO) {
x = readw(ahd->bshs[0].maddr + port);
} else {
x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
}
mb();
return (x);
}
#endif
void
ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
{
if (ahd->tags[0] == BUS_SPACE_MEMIO) {
writeb(val, ahd->bshs[0].maddr + port);
} else {
outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
}
mb();
}
void
ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
{
if (ahd->tags[0] == BUS_SPACE_MEMIO) {
writew(val, ahd->bshs[0].maddr + port);
} else {
outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
}
mb();
}
void
ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
{
int i;
/*
* There is probably a more efficient way to do this on Linux
* but we don't use this for anything speed critical and this
* should work.
*/
for (i = 0; i < count; i++)
ahd_outb(ahd, port, *array++);
}
void
ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
{
int i;
/*
* There is probably a more efficient way to do this on Linux
* but we don't use this for anything speed critical and this
* should work.
*/
for (i = 0; i < count; i++)
*array++ = ahd_inb(ahd, port);
}
/******************************* PCI Routines *********************************/
uint32_t
ahd_pci_read_config(ahd_dev_softc_t pci, int reg, int width)
{
switch (width) {
case 1:
{
uint8_t retval;
pci_read_config_byte(pci, reg, &retval);
return (retval);
}
case 2:
{
uint16_t retval;
pci_read_config_word(pci, reg, &retval);
return (retval);
}
case 4:
{
uint32_t retval;
pci_read_config_dword(pci, reg, &retval);
return (retval);
}
default:
panic("ahd_pci_read_config: Read size too big");
/* NOTREACHED */
return (0);
}
}
void
ahd_pci_write_config(ahd_dev_softc_t pci, int reg, uint32_t value, int width)
{
switch (width) {
case 1:
pci_write_config_byte(pci, reg, value);
break;
case 2:
pci_write_config_word(pci, reg, value);
break;
case 4:
pci_write_config_dword(pci, reg, value);
break;
default:
panic("ahd_pci_write_config: Write size too big");
/* NOTREACHED */
}
}
/****************************** Inlines ***************************************/
static void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
static void
ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
{
struct scsi_cmnd *cmd;
cmd = scb->io_ctx;
ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
scsi_dma_unmap(cmd);
}
/******************************** Macros **************************************/
#define BUILD_SCSIID(ahd, cmd) \
(((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
/*
* Return a string describing the driver.
*/
static const char *
ahd_linux_info(struct Scsi_Host *host)
{
static char buffer[512];
char ahd_info[256];
char *bp;
struct ahd_softc *ahd;
bp = &buffer[0];
ahd = *(struct ahd_softc **)host->hostdata;
memset(bp, 0, sizeof(buffer));
strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev " AIC79XX_DRIVER_VERSION "\n"
" <");
strcat(bp, ahd->description);
strcat(bp, ">\n"
" ");
ahd_controller_info(ahd, ahd_info);
strcat(bp, ahd_info);
return (bp);
}
/*
* Queue an SCB to the controller.
*/
static int
ahd_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
{
struct ahd_softc *ahd;
struct ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
int rtn = SCSI_MLQUEUE_HOST_BUSY;
ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
cmd->scsi_done = scsi_done;
cmd->result = CAM_REQ_INPROG << 16;
rtn = ahd_linux_run_command(ahd, dev, cmd);
return rtn;
}
static DEF_SCSI_QCMD(ahd_linux_queue)
static struct scsi_target **
ahd_linux_target_in_softc(struct scsi_target *starget)
{
struct ahd_softc *ahd =
*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
unsigned int target_offset;
target_offset = starget->id;
if (starget->channel != 0)
target_offset += 8;
return &ahd->platform_data->starget[target_offset];
}
static int
ahd_linux_target_alloc(struct scsi_target *starget)
{
struct ahd_softc *ahd =
*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
struct seeprom_config *sc = ahd->seep_config;
unsigned long flags;
struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
struct ahd_devinfo devinfo;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
char channel = starget->channel + 'A';
ahd_lock(ahd, &flags);
BUG_ON(*ahd_targp != NULL);
*ahd_targp = starget;
if (sc) {
int flags = sc->device_flags[starget->id];
tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
starget->id, &tstate);
if ((flags & CFPACKETIZED) == 0) {
/* don't negotiate packetized (IU) transfers */
spi_max_iu(starget) = 0;
} else {
if ((ahd->features & AHD_RTI) == 0)
spi_rti(starget) = 0;
}
if ((flags & CFQAS) == 0)
spi_max_qas(starget) = 0;
/* Transinfo values have been set to BIOS settings */
spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
spi_min_period(starget) = tinfo->user.period;
spi_max_offset(starget) = tinfo->user.offset;
}
tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
starget->id, &tstate);
ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
CAM_LUN_WILDCARD, channel,
ROLE_INITIATOR);
ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
AHD_TRANS_GOAL, /*paused*/FALSE);
ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
AHD_TRANS_GOAL, /*paused*/FALSE);
ahd_unlock(ahd, &flags);
return 0;
}
static void
ahd_linux_target_destroy(struct scsi_target *starget)
{
struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
*ahd_targp = NULL;
}
static int
ahd_linux_slave_alloc(struct scsi_device *sdev)
{
struct ahd_softc *ahd =
*((struct ahd_softc **)sdev->host->hostdata);
struct ahd_linux_device *dev;
if (bootverbose)
printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
dev = scsi_transport_device_data(sdev);
memset(dev, 0, sizeof(*dev));
/*
* We start out life using untagged
* transactions of which we allow one.
*/
dev->openings = 1;
/*
* Set maxtags to 0. This will be changed if we
* later determine that we are dealing with
* a tagged queuing capable device.
*/
dev->maxtags = 0;
return (0);
}
static int
ahd_linux_slave_configure(struct scsi_device *sdev)
{
struct ahd_softc *ahd;
ahd = *((struct ahd_softc **)sdev->host->hostdata);
if (bootverbose)
sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
ahd_linux_device_queue_depth(sdev);
/* Initial Domain Validation */
if (!spi_initial_dv(sdev->sdev_target))
spi_dv_device(sdev);
return 0;
}
#if defined(__i386__)
/*
* Return the disk geometry for the given SCSI device.
*/
static int
ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int geom[])
{
uint8_t *bh;
int heads;
int sectors;
int cylinders;
int ret;
int extended;
struct ahd_softc *ahd;
ahd = *((struct ahd_softc **)sdev->host->hostdata);
bh = scsi_bios_ptable(bdev);
if (bh) {
ret = scsi_partsize(bh, capacity,
&geom[2], &geom[0], &geom[1]);
kfree(bh);
if (ret != -1)
return (ret);
}
heads = 64;
sectors = 32;
cylinders = aic_sector_div(capacity, heads, sectors);
if (aic79xx_extended != 0)
extended = 1;
else
extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
if (extended && cylinders >= 1024) {
heads = 255;
sectors = 63;
cylinders = aic_sector_div(capacity, heads, sectors);
}
geom[0] = heads;
geom[1] = sectors;
geom[2] = cylinders;
return (0);
}
#endif
/*
* Abort the current SCSI command(s).
*/
static int
ahd_linux_abort(struct scsi_cmnd *cmd)
{
int error;
error = ahd_linux_queue_abort_cmd(cmd);
return error;
}
/*
* Attempt to send a target reset message to the device that timed out.
*/
static int
ahd_linux_dev_reset(struct scsi_cmnd *cmd)
{
struct ahd_softc *ahd;
struct ahd_linux_device *dev;
struct scb *reset_scb;
u_int cdb_byte;
int retval = SUCCESS;
int paused;
int wait;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
unsigned long flags;
DECLARE_COMPLETION_ONSTACK(done);
reset_scb = NULL;
paused = FALSE;
wait = FALSE;
ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
scmd_printk(KERN_INFO, cmd,
"Attempting to queue a TARGET RESET message:");
printk("CDB:");
for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
printk(" 0x%x", cmd->cmnd[cdb_byte]);
printk("\n");
/*
* Determine if we currently own this command.
*/
dev = scsi_transport_device_data(cmd->device);
if (dev == NULL) {
/*
* No target device for this command exists,
* so we must not still own the command.
*/
scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
return SUCCESS;
}
/*
* Generate us a new SCB
*/
reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
if (!reset_scb) {
scmd_printk(KERN_INFO, cmd, "No SCB available\n");
return FAILED;
}
tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
cmd->device->id, &tstate);
reset_scb->io_ctx = cmd;
reset_scb->platform_data->dev = dev;
reset_scb->sg_count = 0;
ahd_set_residual(reset_scb, 0);
ahd_set_sense_residual(reset_scb, 0);
reset_scb->platform_data->xfer_len = 0;
reset_scb->hscb->control = 0;
reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
reset_scb->hscb->lun = cmd->device->lun;
reset_scb->hscb->cdb_len = 0;
reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
reset_scb->flags |= SCB_PACKETIZED;
} else {
reset_scb->hscb->control |= MK_MESSAGE;
}
dev->openings--;
dev->active++;
dev->commands_issued++;
ahd_lock(ahd, &flags);
LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
ahd_queue_scb(ahd, reset_scb);
ahd->platform_data->eh_done = &done;
ahd_unlock(ahd, &flags);
printk("%s: Device reset code sleeping\n", ahd_name(ahd));
if (!wait_for_completion_timeout(&done, 5 * HZ)) {
ahd_lock(ahd, &flags);
ahd->platform_data->eh_done = NULL;
ahd_unlock(ahd, &flags);
printk("%s: Device reset timer expired (active %d)\n",
ahd_name(ahd), dev->active);
retval = FAILED;
}
printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
return (retval);
}
/*
* Reset the SCSI bus.
*/
static int
ahd_linux_bus_reset(struct scsi_cmnd *cmd)
{
struct ahd_softc *ahd;
int found;
unsigned long flags;
ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
printk("%s: Bus reset called for cmd %p\n",
ahd_name(ahd), cmd);
#endif
ahd_lock(ahd, &flags);
found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
/*initiate reset*/TRUE);
ahd_unlock(ahd, &flags);
if (bootverbose)
printk("%s: SCSI bus reset delivered. "
"%d SCBs aborted.\n", ahd_name(ahd), found);
return (SUCCESS);
}
struct scsi_host_template aic79xx_driver_template = {
.module = THIS_MODULE,
.name = "aic79xx",
.proc_name = "aic79xx",
.show_info = ahd_linux_show_info,
.write_info = ahd_proc_write_seeprom,
.info = ahd_linux_info,
.queuecommand = ahd_linux_queue,
.eh_abort_handler = ahd_linux_abort,
.eh_device_reset_handler = ahd_linux_dev_reset,
.eh_bus_reset_handler = ahd_linux_bus_reset,
#if defined(__i386__)
.bios_param = ahd_linux_biosparam,
#endif
.can_queue = AHD_MAX_QUEUE,
.this_id = -1,
.max_sectors = 8192,
.cmd_per_lun = 2,
.use_clustering = ENABLE_CLUSTERING,
.slave_alloc = ahd_linux_slave_alloc,
.slave_configure = ahd_linux_slave_configure,
.target_alloc = ahd_linux_target_alloc,
.target_destroy = ahd_linux_target_destroy,
};
/******************************** Bus DMA *************************************/
int
ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
bus_size_t alignment, bus_size_t boundary,
dma_addr_t lowaddr, dma_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg,
bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
{
bus_dma_tag_t dmat;
dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
if (dmat == NULL)
return (ENOMEM);
/*
* Linux is very simplistic about DMA memory. For now don't
* maintain all specification information. Once Linux supplies
* better facilities for doing these operations, or the
* needs of this particular driver change, we might need to do
* more here.
*/
dmat->alignment = alignment;
dmat->boundary = boundary;
dmat->maxsize = maxsize;
*ret_tag = dmat;
return (0);
}
void
ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
{
kfree(dmat);
}
int
ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
int flags, bus_dmamap_t *mapp)
{
*vaddr = pci_alloc_consistent(ahd->dev_softc,
dmat->maxsize, mapp);
if (*vaddr == NULL)
return (ENOMEM);
return(0);
}
void
ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
void* vaddr, bus_dmamap_t map)
{
pci_free_consistent(ahd->dev_softc, dmat->maxsize,
vaddr, map);
}
int
ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
void *cb_arg, int flags)
{
/*
* Assume for now that this will only be used during
* initialization and not for per-transaction buffer mapping.
*/
bus_dma_segment_t stack_sg;
stack_sg.ds_addr = map;
stack_sg.ds_len = dmat->maxsize;
cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
return (0);
}
void
ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
{
}
int
ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
{
/* Nothing to do */
return (0);
}
/********************* Platform Dependent Functions ***************************/
static void
ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
{
if ((instance >= 0)
&& (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
uint8_t *iocell_info;
iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
iocell_info[index] = value & 0xFFFF;
if (bootverbose)
printk("iocell[%d:%ld] = %d\n", instance, index, value);
}
}
static void
ahd_linux_setup_tag_info_global(char *p)
{
int tags, i, j;
tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
printk("Setting Global Tags= %d\n", tags);
for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
for (j = 0; j < AHD_NUM_TARGETS; j++) {
aic79xx_tag_info[i].tag_commands[j] = tags;
}
}
}
static void
ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
{
if ((instance >= 0) && (targ >= 0)
&& (instance < ARRAY_SIZE(aic79xx_tag_info))
&& (targ < AHD_NUM_TARGETS)) {
aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
if (bootverbose)
printk("tag_info[%d:%d] = %d\n", instance, targ, value);
}
}
static char *
ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
void (*callback)(u_long, int, int, int32_t),
u_long callback_arg)
{
char *tok_end;
char *tok_end2;
int i;
int instance;
int targ;
int done;
char tok_list[] = {'.', ',', '{', '}', '\0'};
/* All options use a ':' name/arg separator */
if (*opt_arg != ':')
return (opt_arg);
opt_arg++;
instance = -1;
targ = -1;
done = FALSE;
/*
* Restore separator that may be in
* the middle of our option argument.
*/
tok_end = strchr(opt_arg, '\0');
if (tok_end < end)
*tok_end = ',';
while (!done) {
switch (*opt_arg) {
case '{':
if (instance == -1) {
instance = 0;
} else {
if (depth > 1) {
if (targ == -1)
targ = 0;
} else {
printk("Malformed Option %s\n",
opt_name);
done = TRUE;
}
}
opt_arg++;
break;
case '}':
if (targ != -1)
targ = -1;
else if (instance != -1)
instance = -1;
opt_arg++;
break;
case ',':
case '.':
if (instance == -1)
done = TRUE;
else if (targ >= 0)
targ++;
else if (instance >= 0)
instance++;
opt_arg++;
break;
case '\0':
done = TRUE;
break;
default:
tok_end = end;
for (i = 0; tok_list[i]; i++) {
tok_end2 = strchr(opt_arg, tok_list[i]);
if ((tok_end2) && (tok_end2 < tok_end))
tok_end = tok_end2;
}
callback(callback_arg, instance, targ,
simple_strtol(opt_arg, NULL, 0));
opt_arg = tok_end;
break;
}
}
return (opt_arg);
}
/*
* Handle Linux boot parameters. This routine allows for assigning a value
* to a parameter with a ':' between the parameter and the value.
* ie. aic79xx=stpwlev:1,extended
*/
static int
aic79xx_setup(char *s)
{
int i, n;
char *p;
char *end;
static const struct {
const char *name;
uint32_t *flag;
} options[] = {
{ "extended", &aic79xx_extended },
{ "no_reset", &aic79xx_no_reset },
{ "verbose", &aic79xx_verbose },
{ "allow_memio", &aic79xx_allow_memio},
#ifdef AHD_DEBUG
{ "debug", &ahd_debug },
#endif
{ "periodic_otag", &aic79xx_periodic_otag },
{ "pci_parity", &aic79xx_pci_parity },
{ "seltime", &aic79xx_seltime },
{ "tag_info", NULL },
{ "global_tag_depth", NULL},
{ "slewrate", NULL },
{ "precomp", NULL },
{ "amplitude", NULL },
{ "slowcrc", &aic79xx_slowcrc },
};
end = strchr(s, '\0');
/*
* XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
* will never be 0 in this case.
*/
n = 0;
while ((p = strsep(&s, ",.")) != NULL) {
if (*p == '\0')
continue;
for (i = 0; i < ARRAY_SIZE(options); i++) {
n = strlen(options[i].name);
if (strncmp(options[i].name, p, n) == 0)
break;
}
if (i == ARRAY_SIZE(options))
continue;
if (strncmp(p, "global_tag_depth", n) == 0) {
ahd_linux_setup_tag_info_global(p + n);
} else if (strncmp(p, "tag_info", n) == 0) {
s = ahd_parse_brace_option("tag_info", p + n, end,
2, ahd_linux_setup_tag_info, 0);
} else if (strncmp(p, "slewrate", n) == 0) {
s = ahd_parse_brace_option("slewrate",
p + n, end, 1, ahd_linux_setup_iocell_info,
AIC79XX_SLEWRATE_INDEX);
} else if (strncmp(p, "precomp", n) == 0) {
s = ahd_parse_brace_option("precomp",
p + n, end, 1, ahd_linux_setup_iocell_info,
AIC79XX_PRECOMP_INDEX);
} else if (strncmp(p, "amplitude", n) == 0) {
s = ahd_parse_brace_option("amplitude",
p + n, end, 1, ahd_linux_setup_iocell_info,
AIC79XX_AMPLITUDE_INDEX);
} else if (p[n] == ':') {
*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
} else if (!strncmp(p, "verbose", n)) {
*(options[i].flag) = 1;
} else {
*(options[i].flag) ^= 0xFFFFFFFF;
}
}
return 1;
}
__setup("aic79xx=", aic79xx_setup);
uint32_t aic79xx_verbose;
int
ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
{
char buf[80];
struct Scsi_Host *host;
char *new_name;
u_long s;
int retval;
template->name = ahd->description;
host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
if (host == NULL)
return (ENOMEM);
*((struct ahd_softc **)host->hostdata) = ahd;
ahd->platform_data->host = host;
host->can_queue = AHD_MAX_QUEUE;
host->cmd_per_lun = 2;
host->sg_tablesize = AHD_NSEG;
host->this_id = ahd->our_id;
host->irq = ahd->platform_data->irq;
host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
host->max_lun = AHD_NUM_LUNS;
host->max_channel = 0;
host->sg_tablesize = AHD_NSEG;
ahd_lock(ahd, &s);
ahd_set_unit(ahd, ahd_linux_unit++);
ahd_unlock(ahd, &s);
sprintf(buf, "scsi%d", host->host_no);
new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
if (new_name != NULL) {
strcpy(new_name, buf);
ahd_set_name(ahd, new_name);
}
host->unique_id = ahd->unit;
ahd_linux_initialize_scsi_bus(ahd);
ahd_intr_enable(ahd, TRUE);
host->transportt = ahd_linux_transport_template;
retval = scsi_add_host(host, &ahd->dev_softc->dev);
if (retval) {
printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
scsi_host_put(host);
return retval;
}
scsi_scan_host(host);
return 0;
}
/*
* Place the SCSI bus into a known state by either resetting it,
* or forcing transfer negotiations on the next command to any
* target.
*/
static void
ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
{
u_int target_id;
u_int numtarg;
unsigned long s;
target_id = 0;
numtarg = 0;
if (aic79xx_no_reset != 0)
ahd->flags &= ~AHD_RESET_BUS_A;
if ((ahd->flags & AHD_RESET_BUS_A) != 0)
ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
else
numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
ahd_lock(ahd, &s);
/*
* Force negotiation to async for all targets that
* will not see an initial bus reset.
*/
for (; target_id < numtarg; target_id++) {
struct ahd_devinfo devinfo;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
target_id, &tstate);
ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
ahd_update_neg_request(ahd, &devinfo, tstate,
tinfo, AHD_NEG_ALWAYS);
}
ahd_unlock(ahd, &s);
/* Give the bus some time to recover */
if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
ahd_freeze_simq(ahd);
msleep(AIC79XX_RESET_DELAY);
ahd_release_simq(ahd);
}
}
int
ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
{
ahd->platform_data =
kzalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
if (ahd->platform_data == NULL)
return (ENOMEM);
ahd->platform_data->irq = AHD_LINUX_NOIRQ;
ahd_lockinit(ahd);
ahd->seltime = (aic79xx_seltime & 0x3) << 4;
return (0);
}
void
ahd_platform_free(struct ahd_softc *ahd)
{
struct scsi_target *starget;
int i;
if (ahd->platform_data != NULL) {
/* destroy all of the device and target objects */
for (i = 0; i < AHD_NUM_TARGETS; i++) {
starget = ahd->platform_data->starget[i];
if (starget != NULL) {
ahd->platform_data->starget[i] = NULL;
}
}
if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
free_irq(ahd->platform_data->irq, ahd);
if (ahd->tags[0] == BUS_SPACE_PIO
&& ahd->bshs[0].ioport != 0)
release_region(ahd->bshs[0].ioport, 256);
if (ahd->tags[1] == BUS_SPACE_PIO
&& ahd->bshs[1].ioport != 0)
release_region(ahd->bshs[1].ioport, 256);
if (ahd->tags[0] == BUS_SPACE_MEMIO
&& ahd->bshs[0].maddr != NULL) {
iounmap(ahd->bshs[0].maddr);
release_mem_region(ahd->platform_data->mem_busaddr,
0x1000);
}
if (ahd->platform_data->host)
scsi_host_put(ahd->platform_data->host);
kfree(ahd->platform_data);
}
}
void
ahd_platform_init(struct ahd_softc *ahd)
{
/*
* Lookup and commit any modified IO Cell options.
*/
if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
const struct ahd_linux_iocell_opts *iocell_opts;
iocell_opts = &aic79xx_iocell_info[ahd->unit];
if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
}
}
void
ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
{
ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
SCB_GET_CHANNEL(ahd, scb),
SCB_GET_LUN(scb), SCB_LIST_NULL,
ROLE_UNKNOWN, CAM_REQUEUE_REQ);
}
void
ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
struct ahd_devinfo *devinfo, ahd_queue_alg alg)
{
struct ahd_linux_device *dev;
int was_queuing;
int now_queuing;
if (sdev == NULL)
return;
dev = scsi_transport_device_data(sdev);
if (dev == NULL)
return;
was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
switch (alg) {
default:
case AHD_QUEUE_NONE:
now_queuing = 0;
break;
case AHD_QUEUE_BASIC:
now_queuing = AHD_DEV_Q_BASIC;
break;
case AHD_QUEUE_TAGGED:
now_queuing = AHD_DEV_Q_TAGGED;
break;
}
if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
&& (was_queuing != now_queuing)
&& (dev->active != 0)) {
dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
dev->qfrozen++;
}
dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
if (now_queuing) {
u_int usertags;
usertags = ahd_linux_user_tagdepth(ahd, devinfo);
if (!was_queuing) {
/*
* Start out aggressively and allow our
* dynamic queue depth algorithm to take
* care of the rest.
*/
dev->maxtags = usertags;
dev->openings = dev->maxtags - dev->active;
}
if (dev->maxtags == 0) {
/*
* Queueing is disabled by the user.
*/
dev->openings = 1;
} else if (alg == AHD_QUEUE_TAGGED) {
dev->flags |= AHD_DEV_Q_TAGGED;
if (aic79xx_periodic_otag != 0)
dev->flags |= AHD_DEV_PERIODIC_OTAG;
} else
dev->flags |= AHD_DEV_Q_BASIC;
} else {
/* We can only have one opening. */
dev->maxtags = 0;
dev->openings = 1 - dev->active;
}
switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
case AHD_DEV_Q_BASIC:
case AHD_DEV_Q_TAGGED:
scsi_change_queue_depth(sdev,
dev->openings + dev->active);
break;
default:
/*
* We allow the OS to queue 2 untagged transactions to
* us at any time even though we can only execute them
* serially on the controller/device. This should
* remove some latency.
*/
scsi_change_queue_depth(sdev, 1);
break;
}
}
int
ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
int lun, u_int tag, role_t role, uint32_t status)
{
return 0;
}
static u_int
ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
{
static int warned_user;
u_int tags;
tags = 0;
if ((ahd->user_discenable & devinfo->target_mask) != 0) {
if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
if (warned_user == 0) {
printk(KERN_WARNING
"aic79xx: WARNING: Insufficient tag_info instances\n"
"aic79xx: for installed controllers. Using defaults\n"
"aic79xx: Please update the aic79xx_tag_info array in\n"
"aic79xx: the aic79xx_osm.c source file.\n");
warned_user++;
}
tags = AHD_MAX_QUEUE;
} else {
adapter_tag_info_t *tag_info;
tag_info = &aic79xx_tag_info[ahd->unit];
tags = tag_info->tag_commands[devinfo->target_offset];
if (tags > AHD_MAX_QUEUE)
tags = AHD_MAX_QUEUE;
}
}
return (tags);
}
/*
* Determines the queue depth for a given device.
*/
static void
ahd_linux_device_queue_depth(struct scsi_device *sdev)
{
struct ahd_devinfo devinfo;
u_int tags;
struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
ahd_compile_devinfo(&devinfo,
ahd->our_id,
sdev->sdev_target->id, sdev->lun,
sdev->sdev_target->channel == 0 ? 'A' : 'B',
ROLE_INITIATOR);
tags = ahd_linux_user_tagdepth(ahd, &devinfo);
if (tags != 0 && sdev->tagged_supported != 0) {
ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
ahd_send_async(ahd, devinfo.channel, devinfo.target,
devinfo.lun, AC_TRANSFER_NEG);
ahd_print_devinfo(ahd, &devinfo);
printk("Tagged Queuing enabled. Depth %d\n", tags);
} else {
ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
ahd_send_async(ahd, devinfo.channel, devinfo.target,
devinfo.lun, AC_TRANSFER_NEG);
}
}
static int
ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
struct scsi_cmnd *cmd)
{
struct scb *scb;
struct hardware_scb *hscb;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
u_int col_idx;
uint16_t mask;
unsigned long flags;
int nseg;
nseg = scsi_dma_map(cmd);
if (nseg < 0)
return SCSI_MLQUEUE_HOST_BUSY;
ahd_lock(ahd, &flags);
/*
* Get an scb to use.
*/
tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
cmd->device->id, &tstate);
if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
|| (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
col_idx = AHD_NEVER_COL_IDX;
} else {
col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
cmd->device->lun);
}
if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
ahd->flags |= AHD_RESOURCE_SHORTAGE;
ahd_unlock(ahd, &flags);
scsi_dma_unmap(cmd);
return SCSI_MLQUEUE_HOST_BUSY;
}
scb->io_ctx = cmd;
scb->platform_data->dev = dev;
hscb = scb->hscb;
cmd->host_scribble = (char *)scb;
/*
* Fill out basics of the HSCB.
*/
hscb->control = 0;
hscb->scsiid = BUILD_SCSIID(ahd, cmd);
hscb->lun = cmd->device->lun;
scb->hscb->task_management = 0;
mask = SCB_GET_TARGET_MASK(ahd, scb);
if ((ahd->user_discenable & mask) != 0)
hscb->control |= DISCENB;
if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
scb->flags |= SCB_PACKETIZED;
if ((tstate->auto_negotiate & mask) != 0) {
scb->flags |= SCB_AUTO_NEGOTIATE;
scb->hscb->control |= MK_MESSAGE;
}
if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
&& (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
hscb->control |= MSG_ORDERED_TASK;
dev->commands_since_idle_or_otag = 0;
} else {
hscb->control |= MSG_SIMPLE_TASK;
}
}
hscb->cdb_len = cmd->cmd_len;
memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
scb->platform_data->xfer_len = 0;
ahd_set_residual(scb, 0);
ahd_set_sense_residual(scb, 0);
scb->sg_count = 0;
if (nseg > 0) {
void *sg = scb->sg_list;
struct scatterlist *cur_seg;
int i;
scb->platform_data->xfer_len = 0;
scsi_for_each_sg(cmd, cur_seg, nseg, i) {
dma_addr_t addr;
bus_size_t len;
addr = sg_dma_address(cur_seg);
len = sg_dma_len(cur_seg);
scb->platform_data->xfer_len += len;
sg = ahd_sg_setup(ahd, scb, sg, addr, len,
i == (nseg - 1));
}
}
LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
dev->openings--;
dev->active++;
dev->commands_issued++;
if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
dev->commands_since_idle_or_otag++;
scb->flags |= SCB_ACTIVE;
ahd_queue_scb(ahd, scb);
ahd_unlock(ahd, &flags);
return 0;
}
/*
* SCSI controller interrupt handler.
*/
irqreturn_t
ahd_linux_isr(int irq, void *dev_id)
{
struct ahd_softc *ahd;
u_long flags;
int ours;
ahd = (struct ahd_softc *) dev_id;
ahd_lock(ahd, &flags);
ours = ahd_intr(ahd);
ahd_unlock(ahd, &flags);
return IRQ_RETVAL(ours);
}
void
ahd_send_async(struct ahd_softc *ahd, char channel,
u_int target, u_int lun, ac_code code)
{
switch (code) {
case AC_TRANSFER_NEG:
{
struct scsi_target *starget;
struct ahd_initiator_tinfo *tinfo;
struct ahd_tmode_tstate *tstate;
unsigned int target_ppr_options;
BUG_ON(target == CAM_TARGET_WILDCARD);
tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
target, &tstate);
/*
* Don't bother reporting results while
* negotiations are still pending.
*/
if (tinfo->curr.period != tinfo->goal.period
|| tinfo->curr.width != tinfo->goal.width
|| tinfo->curr.offset != tinfo->goal.offset
|| tinfo->curr.ppr_options != tinfo->goal.ppr_options)
if (bootverbose == 0)
break;
/*
* Don't bother reporting results that
* are identical to those last reported.
*/
starget = ahd->platform_data->starget[target];
if (starget == NULL)
break;
target_ppr_options =
(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
+ (spi_iu(starget) ? MSG_EXT_PPR_IU_REQ : 0)
+ (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
+ (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
+ (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
+ (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
+ (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
if (tinfo->curr.period == spi_period(starget)
&& tinfo->curr.width == spi_width(starget)
&& tinfo->curr.offset == spi_offset(starget)
&& tinfo->curr.ppr_options == target_ppr_options)
if (bootverbose == 0)
break;
spi_period(starget) = tinfo->curr.period;
spi_width(starget) = tinfo->curr.width;
spi_offset(starget) = tinfo->curr.offset;
spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
spi_pcomp_en(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
spi_rti(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RTI ? 1 : 0;
spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
spi_display_xfer_agreement(starget);
break;
}
case AC_SENT_BDR:
{
WARN_ON(lun != CAM_LUN_WILDCARD);
scsi_report_device_reset(ahd->platform_data->host,
channel - 'A', target);
break;
}
case AC_BUS_RESET:
if (ahd->platform_data->host != NULL) {
scsi_report_bus_reset(ahd->platform_data->host,
channel - 'A');
}
break;
default:
panic("ahd_send_async: Unexpected async event");
}
}
/*
* Calls the higher level scsi done function and frees the scb.
*/
void
ahd_done(struct ahd_softc *ahd, struct scb *scb)
{
struct scsi_cmnd *cmd;
struct ahd_linux_device *dev;
if ((scb->flags & SCB_ACTIVE) == 0) {
printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
ahd_dump_card_state(ahd);
panic("Stopping for safety");
}
LIST_REMOVE(scb, pending_links);
cmd = scb->io_ctx;
dev = scb->platform_data->dev;
dev->active--;
dev->openings++;
if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
cmd->result &= ~(CAM_DEV_QFRZN << 16);
dev->qfrozen--;
}
ahd_linux_unmap_scb(ahd, scb);
/*
* Guard against stale sense data.
* The Linux mid-layer assumes that sense
* was retrieved anytime the first byte of
* the sense buffer looks "sane".
*/
cmd->sense_buffer[0] = 0;
if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
uint32_t amount_xferred;
amount_xferred =
ahd_get_transfer_length(scb) - ahd_get_residual(scb);
if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_MISC) != 0) {
ahd_print_path(ahd, scb);
printk("Set CAM_UNCOR_PARITY\n");
}
#endif
ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
#ifdef AHD_REPORT_UNDERFLOWS
/*
* This code is disabled by default as some
* clients of the SCSI system do not properly
* initialize the underflow parameter. This
* results in spurious termination of commands
* that complete as expected (e.g. underflow is
* allowed as command can return variable amounts
* of data.
*/
} else if (amount_xferred < scb->io_ctx->underflow) {
u_int i;
ahd_print_path(ahd, scb);
printk("CDB:");
for (i = 0; i < scb->io_ctx->cmd_len; i++)
printk(" 0x%x", scb->io_ctx->cmnd[i]);
printk("\n");
ahd_print_path(ahd, scb);
printk("Saw underflow (%ld of %ld bytes). "
"Treated as error\n",
ahd_get_residual(scb),
ahd_get_transfer_length(scb));
ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
#endif
} else {
ahd_set_transaction_status(scb, CAM_REQ_CMP);
}
} else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
}
if (dev->openings == 1
&& ahd_get_transaction_status(scb) == CAM_REQ_CMP
&& ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
dev->tag_success_count++;
/*
* Some devices deal with temporary internal resource
* shortages by returning queue full. When the queue
* full occurrs, we throttle back. Slowly try to get
* back to our previous queue depth.
*/
if ((dev->openings + dev->active) < dev->maxtags
&& dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
dev->tag_success_count = 0;
dev->openings++;
}
if (dev->active == 0)
dev->commands_since_idle_or_otag = 0;
if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
printk("Recovery SCB completes\n");
if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
|| ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
if (ahd->platform_data->eh_done)
complete(ahd->platform_data->eh_done);
}
ahd_free_scb(ahd, scb);
ahd_linux_queue_cmd_complete(ahd, cmd);
}
static void
ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
struct scsi_device *sdev, struct scb *scb)
{
struct ahd_devinfo devinfo;
struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
ahd_compile_devinfo(&devinfo,
ahd->our_id,
sdev->sdev_target->id, sdev->lun,
sdev->sdev_target->channel == 0 ? 'A' : 'B',
ROLE_INITIATOR);
/*
* We don't currently trust the mid-layer to
* properly deal with queue full or busy. So,
* when one occurs, we tell the mid-layer to
* unconditionally requeue the command to us
* so that we can retry it ourselves. We also
* implement our own throttling mechanism so
* we don't clobber the device with too many
* commands.
*/
switch (ahd_get_scsi_status(scb)) {
default:
break;
case SCSI_STATUS_CHECK_COND:
case SCSI_STATUS_CMD_TERMINATED:
{
struct scsi_cmnd *cmd;
/*
* Copy sense information to the OS's cmd
* structure if it is available.
*/
cmd = scb->io_ctx;
if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
struct scsi_status_iu_header *siu;
u_int sense_size;
u_int sense_offset;
if (scb->flags & SCB_SENSE) {
sense_size = min(sizeof(struct scsi_sense_data)
- ahd_get_sense_residual(scb),
(u_long)SCSI_SENSE_BUFFERSIZE);
sense_offset = 0;
} else {
/*
* Copy only the sense data into the provided
* buffer.
*/
siu = (struct scsi_status_iu_header *)
scb->sense_data;
sense_size = min_t(size_t,
scsi_4btoul(siu->sense_length),
SCSI_SENSE_BUFFERSIZE);
sense_offset = SIU_SENSE_OFFSET(siu);
}
memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
memcpy(cmd->sense_buffer,
ahd_get_sense_buf(ahd, scb)
+ sense_offset, sense_size);
cmd->result |= (DRIVER_SENSE << 24);
#ifdef AHD_DEBUG
if (ahd_debug & AHD_SHOW_SENSE) {
int i;
printk("Copied %d bytes of sense data at %d:",
sense_size, sense_offset);
for (i = 0; i < sense_size; i++) {
if ((i & 0xF) == 0)
printk("\n");
printk("0x%x ", cmd->sense_buffer[i]);
}
printk("\n");
}
#endif
}
break;
}
case SCSI_STATUS_QUEUE_FULL:
/*
* By the time the core driver has returned this
* command, all other commands that were queued
* to us but not the device have been returned.
* This ensures that dev->active is equal to
* the number of commands actually queued to
* the device.
*/
dev->tag_success_count = 0;
if (dev->active != 0) {
/*
* Drop our opening count to the number
* of commands currently outstanding.
*/
dev->openings = 0;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
ahd_print_path(ahd, scb);
printk("Dropping tag count to %d\n",
dev->active);
}
#endif
if (dev->active == dev->tags_on_last_queuefull) {
dev->last_queuefull_same_count++;
/*
* If we repeatedly see a queue full
* at the same queue depth, this
* device has a fixed number of tag
* slots. Lock in this tag depth
* so we stop seeing queue fulls from
* this device.
*/
if (dev->last_queuefull_same_count
== AHD_LOCK_TAGS_COUNT) {
dev->maxtags = dev->active;
ahd_print_path(ahd, scb);
printk("Locking max tag count at %d\n",
dev->active);
}
} else {
dev->tags_on_last_queuefull = dev->active;
dev->last_queuefull_same_count = 0;
}
ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
ahd_set_scsi_status(scb, SCSI_STATUS_OK);
ahd_platform_set_tags(ahd, sdev, &devinfo,
(dev->flags & AHD_DEV_Q_BASIC)
? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
break;
}
/*
* Drop down to a single opening, and treat this
* as if the target returned BUSY SCSI status.
*/
dev->openings = 1;
ahd_platform_set_tags(ahd, sdev, &devinfo,
(dev->flags & AHD_DEV_Q_BASIC)
? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
}
}
static void
ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
{
int status;
int new_status = DID_OK;
int do_fallback = 0;
int scsi_status;
/*
* Map CAM error codes into Linux Error codes. We
* avoid the conversion so that the DV code has the
* full error information available when making
* state change decisions.
*/
status = ahd_cmd_get_transaction_status(cmd);
switch (status) {
case CAM_REQ_INPROG:
case CAM_REQ_CMP:
new_status = DID_OK;
break;
case CAM_AUTOSENSE_FAIL:
new_status = DID_ERROR;
/* Fallthrough */
case CAM_SCSI_STATUS_ERROR:
scsi_status = ahd_cmd_get_scsi_status(cmd);
switch(scsi_status) {
case SCSI_STATUS_CMD_TERMINATED:
case SCSI_STATUS_CHECK_COND:
if ((cmd->result >> 24) != DRIVER_SENSE) {
do_fallback = 1;
} else {
struct scsi_sense_data *sense;
sense = (struct scsi_sense_data *)
cmd->sense_buffer;
if (sense->extra_len >= 5 &&
(sense->add_sense_code == 0x47
|| sense->add_sense_code == 0x48))
do_fallback = 1;
}
break;
default:
break;
}
break;
case CAM_REQ_ABORTED:
new_status = DID_ABORT;
break;
case CAM_BUSY:
new_status = DID_BUS_BUSY;
break;
case CAM_REQ_INVALID:
case CAM_PATH_INVALID:
new_status = DID_BAD_TARGET;
break;
case CAM_SEL_TIMEOUT:
new_status = DID_NO_CONNECT;
break;
case CAM_SCSI_BUS_RESET:
case CAM_BDR_SENT:
new_status = DID_RESET;
break;
case CAM_UNCOR_PARITY:
new_status = DID_PARITY;
do_fallback = 1;
break;
case CAM_CMD_TIMEOUT:
new_status = DID_TIME_OUT;
do_fallback = 1;
break;
case CAM_REQ_CMP_ERR:
case CAM_UNEXP_BUSFREE:
case CAM_DATA_RUN_ERR:
new_status = DID_ERROR;
do_fallback = 1;
break;
case CAM_UA_ABORT:
case CAM_NO_HBA:
case CAM_SEQUENCE_FAIL:
case CAM_CCB_LEN_ERR:
case CAM_PROVIDE_FAIL:
case CAM_REQ_TERMIO:
case CAM_UNREC_HBA_ERROR:
case CAM_REQ_TOO_BIG:
new_status = DID_ERROR;
break;
case CAM_REQUEUE_REQ:
new_status = DID_REQUEUE;
break;
default:
/* We should never get here */
new_status = DID_ERROR;
break;
}
if (do_fallback) {
printk("%s: device overrun (status %x) on %d:%d:%d\n",
ahd_name(ahd), status, cmd->device->channel,
cmd->device->id, (u8)cmd->device->lun);
}
ahd_cmd_set_transaction_status(cmd, new_status);
cmd->scsi_done(cmd);
}
static void
ahd_freeze_simq(struct ahd_softc *ahd)
{
scsi_block_requests(ahd->platform_data->host);
}
static void
ahd_release_simq(struct ahd_softc *ahd)
{
scsi_unblock_requests(ahd->platform_data->host);
}
static int
ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
{
struct ahd_softc *ahd;
struct ahd_linux_device *dev;
struct scb *pending_scb;
u_int saved_scbptr;
u_int active_scbptr;
u_int last_phase;
u_int saved_scsiid;
u_int cdb_byte;
int retval;
int was_paused;
int paused;
int wait;
int disconnected;
ahd_mode_state saved_modes;
unsigned long flags;
pending_scb = NULL;
paused = FALSE;
wait = FALSE;
ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
scmd_printk(KERN_INFO, cmd,
"Attempting to queue an ABORT message:");
printk("CDB:");
for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
printk(" 0x%x", cmd->cmnd[cdb_byte]);
printk("\n");
ahd_lock(ahd, &flags);
/*
* First determine if we currently own this command.
* Start by searching the device queue. If not found
* there, check the pending_scb list. If not found
* at all, and the system wanted us to just abort the
* command, return success.
*/
dev = scsi_transport_device_data(cmd->device);
if (dev == NULL) {
/*
* No target device for this command exists,
* so we must not still own the command.
*/
scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
retval = SUCCESS;
goto no_cmd;
}
/*
* See if we can find a matching cmd in the pending list.
*/
LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
if (pending_scb->io_ctx == cmd)
break;
}
if (pending_scb == NULL) {
scmd_printk(KERN_INFO, cmd, "Command not found\n");
goto no_cmd;
}
if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
/*
* We can't queue two recovery actions using the same SCB
*/
retval = FAILED;
goto done;
}
/*
* Ensure that the card doesn't do anything
* behind our back. Also make sure that we
* didn't "just" miss an interrupt that would
* affect this cmd.
*/
was_paused = ahd_is_paused(ahd);
ahd_pause_and_flushwork(ahd);
paused = TRUE;
if ((pending_scb->flags & SCB_ACTIVE) == 0) {
scmd_printk(KERN_INFO, cmd, "Command already completed\n");
goto no_cmd;
}
printk("%s: At time of recovery, card was %spaused\n",
ahd_name(ahd), was_paused ? "" : "not ");
ahd_dump_card_state(ahd);
disconnected = TRUE;
if (ahd_search_qinfifo(ahd, cmd->device->id,
cmd->device->channel + 'A',
cmd->device->lun,
pending_scb->hscb->tag,
ROLE_INITIATOR, CAM_REQ_ABORTED,
SEARCH_COMPLETE) > 0) {
printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
ahd_name(ahd), cmd->device->channel,
cmd->device->id, (u8)cmd->device->lun);
retval = SUCCESS;
goto done;
}
saved_modes = ahd_save_modes(ahd);
ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
last_phase = ahd_inb(ahd, LASTPHASE);
saved_scbptr = ahd_get_scbptr(ahd);
active_scbptr = saved_scbptr;
if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
struct scb *bus_scb;
bus_scb = ahd_lookup_scb(ahd, active_scbptr);
if (bus_scb == pending_scb)
disconnected = FALSE;
}
/*
* At this point, pending_scb is the scb associated with the
* passed in command. That command is currently active on the
* bus or is in the disconnected state.
*/
saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
if (last_phase != P_BUSFREE
&& SCB_GET_TAG(pending_scb) == active_scbptr) {
/*
* We're active on the bus, so assert ATN
* and hope that the target responds.
*/
pending_scb = ahd_lookup_scb(ahd, active_scbptr);
pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
ahd_outb(ahd, MSG_OUT, HOST_MSG);
ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
wait = TRUE;
} else if (disconnected) {
/*
* Actually re-queue this SCB in an attempt
* to select the device before it reconnects.
*/
pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
pending_scb->hscb->cdb_len = 0;
pending_scb->hscb->task_attribute = 0;
pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
/*
* Mark the SCB has having an outstanding
* task management function. Should the command
* complete normally before the task management
* function can be sent, the host will be notified
* to abort our requeued SCB.
*/
ahd_outb(ahd, SCB_TASK_MANAGEMENT,
pending_scb->hscb->task_management);
} else {
/*
* If non-packetized, set the MK_MESSAGE control
* bit indicating that we desire to send a message.
* We also set the disconnected flag since there is
* no guarantee that our SCB control byte matches
* the version on the card. We don't want the
* sequencer to abort the command thinking an
* unsolicited reselection occurred.
*/
pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
/*
* The sequencer will never re-reference the
* in-core SCB. To make sure we are notified
* during reselection, set the MK_MESSAGE flag in
* the card's copy of the SCB.
*/
ahd_outb(ahd, SCB_CONTROL,
ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
}
/*
* Clear out any entries in the QINFIFO first
* so we are the next SCB for this target
* to run.
*/
ahd_search_qinfifo(ahd, cmd->device->id,
cmd->device->channel + 'A', cmd->device->lun,
SCB_LIST_NULL, ROLE_INITIATOR,
CAM_REQUEUE_REQ, SEARCH_COMPLETE);
ahd_qinfifo_requeue_tail(ahd, pending_scb);
ahd_set_scbptr(ahd, saved_scbptr);
ahd_print_path(ahd, pending_scb);
printk("Device is disconnected, re-queuing SCB\n");
wait = TRUE;
} else {
scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
retval = FAILED;
goto done;
}
no_cmd:
/*
* Our assumption is that if we don't have the command, no
* recovery action was required, so we return success. Again,
* the semantics of the mid-layer recovery engine are not
* well defined, so this may change in time.
*/
retval = SUCCESS;
done:
if (paused)
ahd_unpause(ahd);
if (wait) {
DECLARE_COMPLETION_ONSTACK(done);
ahd->platform_data->eh_done = &done;
ahd_unlock(ahd, &flags);
printk("%s: Recovery code sleeping\n", ahd_name(ahd));
if (!wait_for_completion_timeout(&done, 5 * HZ)) {
ahd_lock(ahd, &flags);
ahd->platform_data->eh_done = NULL;
ahd_unlock(ahd, &flags);
printk("%s: Timer Expired (active %d)\n",
ahd_name(ahd), dev->active);
retval = FAILED;
}
printk("Recovery code awake\n");
} else
ahd_unlock(ahd, &flags);
if (retval != SUCCESS)
printk("%s: Command abort returning 0x%x\n",
ahd_name(ahd), retval);
return retval;
}
static void ahd_linux_set_width(struct scsi_target *starget, int width)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_devinfo devinfo;
unsigned long flags;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_lock(ahd, &flags);
ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_period(struct scsi_target *starget, int period)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options;
unsigned int dt;
unsigned long flags;
unsigned long offset = tinfo->goal.offset;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: set period to %d\n", ahd_name(ahd), period);
#endif
if (offset == 0)
offset = MAX_OFFSET;
if (period < 8)
period = 8;
if (period < 10) {
if (spi_max_width(starget)) {
ppr_options |= MSG_EXT_PPR_DT_REQ;
if (period == 8)
ppr_options |= MSG_EXT_PPR_IU_REQ;
} else
period = 10;
}
dt = ppr_options & MSG_EXT_PPR_DT_REQ;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
/* all PPR requests apart from QAS require wide transfers */
if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
if (spi_width(starget) == 0)
ppr_options &= MSG_EXT_PPR_QAS_REQ;
}
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = 0;
unsigned int period = 0;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: set offset to %d\n", ahd_name(ahd), offset);
#endif
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
if (offset != 0) {
period = tinfo->goal.period;
ppr_options = tinfo->goal.ppr_options;
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
}
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_DT_REQ;
unsigned int period = tinfo->goal.period;
unsigned int width = tinfo->goal.width;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s DT\n", ahd_name(ahd),
dt ? "enabling" : "disabling");
#endif
if (dt && spi_max_width(starget)) {
ppr_options |= MSG_EXT_PPR_DT_REQ;
if (!width)
ahd_linux_set_width(starget, 1);
} else {
if (period <= 9)
period = 10; /* If resetting DT, period must be >= 25ns */
/* IU is invalid without DT set */
ppr_options &= ~MSG_EXT_PPR_IU_REQ;
}
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_QAS_REQ;
unsigned int period = tinfo->goal.period;
unsigned int dt;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s QAS\n", ahd_name(ahd),
qas ? "enabling" : "disabling");
#endif
if (qas) {
ppr_options |= MSG_EXT_PPR_QAS_REQ;
}
dt = ppr_options & MSG_EXT_PPR_DT_REQ;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_IU_REQ;
unsigned int period = tinfo->goal.period;
unsigned int dt;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s IU\n", ahd_name(ahd),
iu ? "enabling" : "disabling");
#endif
if (iu && spi_max_width(starget)) {
ppr_options |= MSG_EXT_PPR_IU_REQ;
ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
}
dt = ppr_options & MSG_EXT_PPR_DT_REQ;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_RD_STRM;
unsigned int period = tinfo->goal.period;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s Read Streaming\n", ahd_name(ahd),
rdstrm ? "enabling" : "disabling");
#endif
if (rdstrm && spi_max_width(starget))
ppr_options |= MSG_EXT_PPR_RD_STRM;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_WR_FLOW;
unsigned int period = tinfo->goal.period;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s Write Flow Control\n", ahd_name(ahd),
wrflow ? "enabling" : "disabling");
#endif
if (wrflow && spi_max_width(starget))
ppr_options |= MSG_EXT_PPR_WR_FLOW;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_RTI;
unsigned int period = tinfo->goal.period;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
if ((ahd->features & AHD_RTI) == 0) {
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: RTI not available\n", ahd_name(ahd));
#endif
return;
}
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s RTI\n", ahd_name(ahd),
rti ? "enabling" : "disabling");
#endif
if (rti && spi_max_width(starget))
ppr_options |= MSG_EXT_PPR_RTI;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_PCOMP_EN;
unsigned int period = tinfo->goal.period;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
#ifdef AHD_DEBUG
if ((ahd_debug & AHD_SHOW_DV) != 0)
printk("%s: %s Precompensation\n", ahd_name(ahd),
pcomp ? "Enable" : "Disable");
#endif
if (pcomp && spi_max_width(starget)) {
uint8_t precomp;
if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
const struct ahd_linux_iocell_opts *iocell_opts;
iocell_opts = &aic79xx_iocell_info[ahd->unit];
precomp = iocell_opts->precomp;
} else {
precomp = AIC79XX_DEFAULT_PRECOMP;
}
ppr_options |= MSG_EXT_PPR_PCOMP_EN;
AHD_SET_PRECOMP(ahd, precomp);
} else {
AHD_SET_PRECOMP(ahd, 0);
}
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
struct ahd_tmode_tstate *tstate;
struct ahd_initiator_tinfo *tinfo
= ahd_fetch_transinfo(ahd,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahd_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_HOLD_MCS;
unsigned int period = tinfo->goal.period;
unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
unsigned long flags;
if (hold && spi_max_width(starget))
ppr_options |= MSG_EXT_PPR_HOLD_MCS;
ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahd_find_syncrate(ahd, &period, &ppr_options,
dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
ahd_lock(ahd, &flags);
ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
ppr_options, AHD_TRANS_GOAL, FALSE);
ahd_unlock(ahd, &flags);
}
static void ahd_linux_get_signalling(struct Scsi_Host *shost)
{
struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
unsigned long flags;
u8 mode;
ahd_lock(ahd, &flags);
ahd_pause(ahd);
mode = ahd_inb(ahd, SBLKCTL);
ahd_unpause(ahd);
ahd_unlock(ahd, &flags);
if (mode & ENAB40)
spi_signalling(shost) = SPI_SIGNAL_LVD;
else if (mode & ENAB20)
spi_signalling(shost) = SPI_SIGNAL_SE;
else
spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
}
static struct spi_function_template ahd_linux_transport_functions = {
.set_offset = ahd_linux_set_offset,
.show_offset = 1,
.set_period = ahd_linux_set_period,
.show_period = 1,
.set_width = ahd_linux_set_width,
.show_width = 1,
.set_dt = ahd_linux_set_dt,
.show_dt = 1,
.set_iu = ahd_linux_set_iu,
.show_iu = 1,
.set_qas = ahd_linux_set_qas,
.show_qas = 1,
.set_rd_strm = ahd_linux_set_rd_strm,
.show_rd_strm = 1,
.set_wr_flow = ahd_linux_set_wr_flow,
.show_wr_flow = 1,
.set_rti = ahd_linux_set_rti,
.show_rti = 1,
.set_pcomp_en = ahd_linux_set_pcomp_en,
.show_pcomp_en = 1,
.set_hold_mcs = ahd_linux_set_hold_mcs,
.show_hold_mcs = 1,
.get_signalling = ahd_linux_get_signalling,
};
static int __init
ahd_linux_init(void)
{
int error = 0;
/*
* If we've been passed any parameters, process them now.
*/
if (aic79xx)
aic79xx_setup(aic79xx);
ahd_linux_transport_template =
spi_attach_transport(&ahd_linux_transport_functions);
if (!ahd_linux_transport_template)
return -ENODEV;
scsi_transport_reserve_device(ahd_linux_transport_template,
sizeof(struct ahd_linux_device));
error = ahd_linux_pci_init();
if (error)
spi_release_transport(ahd_linux_transport_template);
return error;
}
static void __exit
ahd_linux_exit(void)
{
ahd_linux_pci_exit();
spi_release_transport(ahd_linux_transport_template);
}
module_init(ahd_linux_init);
module_exit(ahd_linux_exit);