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linux/drivers/scsi/aic7xxx/aic7xxx_osm.c
Lee Jones aa89d74e04 scsi: aic7xxx: Fix 'amount_xferred' set but not used issue 
'amount_xferred' is used, but only in certain circumstances.  Place the
same stipulations on the defining/allocating of 'amount_xferred' as is
placed when using it.

We've been careful not to change any of the ordering semantics here.

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/aic7xxx/aic7xxx_osm.c: In function ‘ahc_done’:
 drivers/scsi/aic7xxx/aic7xxx_osm.c:1725:12: warning: variable ‘amount_xferred’ set but not used [-Wunused-but-set-variable]
 1725 | uint32_t amount_xferred;
 | ^~~~~~~~~~~~~~

Link: https://lore.kernel.org/r/20200713074645.126138-22-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@suse.com>
Cc: "Daniel M. Eischen" <deischen@iworks.InterWorks.org>
Cc: Doug Ledford <dledford@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-07-15 16:01:58 -04:00

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/*
* Adaptec AIC7xxx device driver for Linux.
*
* $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
*
* Copyright (c) 1994 John Aycock
* The University of Calgary Department of Computer Science.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
* driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
* config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
* the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
* the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
* (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
* the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
* ANSI SCSI-2 specification (draft 10c), ...
*
* --------------------------------------------------------------------------
*
* Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
*
* Substantially modified to include support for wide and twin bus
* adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
* SCB paging, and other rework of the code.
*
* --------------------------------------------------------------------------
* Copyright (c) 1994-2000 Justin T. Gibbs.
* 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.
*
*---------------------------------------------------------------------------
*
* Thanks also go to (in alphabetical order) the following:
*
* Rory Bolt - Sequencer bug fixes
* Jay Estabrook - Initial DEC Alpha support
* Doug Ledford - Much needed abort/reset bug fixes
* Kai Makisara - DMAing of SCBs
*
* A Boot time option was also added for not resetting the scsi bus.
*
* Form: aic7xxx=extended
* aic7xxx=no_reset
* aic7xxx=verbose
*
* Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
*
* Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
*/
/*
* Further driver modifications made by Doug Ledford <dledford@redhat.com>
*
* Copyright (c) 1997-1999 Doug Ledford
*
* These changes are released under the same licensing terms as the FreeBSD
* driver written by Justin Gibbs. Please see his Copyright notice above
* for the exact terms and conditions covering my changes as well as the
* warranty statement.
*
* Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
* but are not limited to:
*
* 1: Import of the latest FreeBSD sequencer code for this driver
* 2: Modification of kernel code to accommodate different sequencer semantics
* 3: Extensive changes throughout kernel portion of driver to improve
* abort/reset processing and error hanndling
* 4: Other work contributed by various people on the Internet
* 5: Changes to printk information and verbosity selection code
* 6: General reliability related changes, especially in IRQ management
* 7: Modifications to the default probe/attach order for supported cards
* 8: SMP friendliness has been improved
*
*/
#include "aic7xxx_osm.h"
#include "aic7xxx_inline.h"
#include <scsi/scsicam.h>
static struct scsi_transport_template *ahc_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/slab.h>
/*
* 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_AIC7XXX_RESET_DELAY_MS
#define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
#else
#define AIC7XXX_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="aic7xxx=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 {
uint8_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 aic7xxx 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 aic7xxx_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_AIC7XXX_CMDS_PER_DEVICE
#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
#else
#define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
#endif
#define AIC7XXX_CONFIGED_TAG_COMMANDS { \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE \
}
/*
* By default, use the number of commands specified by
* the users kernel configuration.
*/
static adapter_tag_info_t aic7xxx_tag_info[] =
{
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS},
{AIC7XXX_CONFIGED_TAG_COMMANDS}
};
/*
* 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
ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
{
printk("(scsi%d:%c:%d:%d): ",
ahc->platform_data->host->host_no,
scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
scb != NULL ? SCB_GET_LUN(scb) : -1);
}
/*
* XXX - these options apply unilaterally to _all_ 274x/284x/294x
* 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 aic7xxx_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 aic7xxx_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 where stray PCI transactions with bad parity are
* the norm rather than the exception, the error messages can be overwhelming.
* It's included in the driver for completeness.
* 0 = Shut off PCI parity check
* non-0 = reverse polarity pci parity checking
*/
static uint32_t aic7xxx_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 aic7xxx_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 aic7xxx_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 aic7xxx_periodic_otag;
/*
* Module information and settable options.
*/
static char *aic7xxx = NULL;
MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
module_param(aic7xxx, charp, 0444);
MODULE_PARM_DESC(aic7xxx,
"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_probe Toggle EISA/VLB controller probing\n"
" probe_eisa_vl Toggle EISA/VLB controller probing\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"
" drives or RAID arrays.\n"
" tag_info:<tag_str> Set per-target tag depth\n"
" global_tag_depth:<int> Global tag depth for every target\n"
" on every bus\n"
" seltime:<int> Selection Timeout\n"
" (0/256ms,1/128ms,2/64ms,3/32ms)\n"
"\n"
" Sample modprobe configuration file:\n"
" # Toggle EISA/VLB probing\n"
" # Set tag depth on Controller 1/Target 1 to 10 tags\n"
" # Shorten the selection timeout to 128ms\n"
"\n"
" options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
);
static void ahc_linux_handle_scsi_status(struct ahc_softc *,
struct scsi_device *,
struct scb *);
static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
struct scsi_cmnd *cmd);
static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
static void ahc_linux_release_simq(struct ahc_softc *ahc);
static int ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
struct ahc_devinfo *devinfo);
static void ahc_linux_device_queue_depth(struct scsi_device *);
static int ahc_linux_run_command(struct ahc_softc*,
struct ahc_linux_device *,
struct scsi_cmnd *);
static void ahc_linux_setup_tag_info_global(char *p);
static int aic7xxx_setup(char *s);
static int ahc_linux_unit;
/************************** OS Utility Wrappers *******************************/
void
ahc_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
ahc_inb(struct ahc_softc * ahc, long port)
{
uint8_t x;
if (ahc->tag == BUS_SPACE_MEMIO) {
x = readb(ahc->bsh.maddr + port);
} else {
x = inb(ahc->bsh.ioport + port);
}
mb();
return (x);
}
void
ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
{
if (ahc->tag == BUS_SPACE_MEMIO) {
writeb(val, ahc->bsh.maddr + port);
} else {
outb(val, ahc->bsh.ioport + port);
}
mb();
}
void
ahc_outsb(struct ahc_softc * ahc, 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++)
ahc_outb(ahc, port, *array++);
}
void
ahc_insb(struct ahc_softc * ahc, 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++ = ahc_inb(ahc, port);
}
/********************************* Inlines ************************************/
static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
struct ahc_dma_seg *sg,
dma_addr_t addr, bus_size_t len);
static void
ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
{
struct scsi_cmnd *cmd;
cmd = scb->io_ctx;
ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
scsi_dma_unmap(cmd);
}
static int
ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
{
int consumed;
if ((scb->sg_count + 1) > AHC_NSEG)
panic("Too few segs for dma mapping. "
"Increase AHC_NSEG\n");
consumed = 1;
sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
scb->platform_data->xfer_len += len;
if (sizeof(dma_addr_t) > 4
&& (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
sg->len = ahc_htole32(len);
return (consumed);
}
/*
* Return a string describing the driver.
*/
static const char *
ahc_linux_info(struct Scsi_Host *host)
{
static char buffer[512];
char ahc_info[256];
char *bp;
struct ahc_softc *ahc;
bp = &buffer[0];
ahc = *(struct ahc_softc **)host->hostdata;
memset(bp, 0, sizeof(buffer));
strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
" <");
strcat(bp, ahc->description);
strcat(bp, ">\n"
" ");
ahc_controller_info(ahc, ahc_info);
strcat(bp, ahc_info);
strcat(bp, "\n");
return (bp);
}
/*
* Queue an SCB to the controller.
*/
static int
ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
{
struct ahc_softc *ahc;
struct ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
int rtn = SCSI_MLQUEUE_HOST_BUSY;
unsigned long flags;
ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
ahc_lock(ahc, &flags);
if (ahc->platform_data->qfrozen == 0) {
cmd->scsi_done = scsi_done;
cmd->result = CAM_REQ_INPROG << 16;
rtn = ahc_linux_run_command(ahc, dev, cmd);
}
ahc_unlock(ahc, &flags);
return rtn;
}
static DEF_SCSI_QCMD(ahc_linux_queue)
static inline struct scsi_target **
ahc_linux_target_in_softc(struct scsi_target *starget)
{
struct ahc_softc *ahc =
*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
unsigned int target_offset;
target_offset = starget->id;
if (starget->channel != 0)
target_offset += 8;
return &ahc->platform_data->starget[target_offset];
}
static int
ahc_linux_target_alloc(struct scsi_target *starget)
{
struct ahc_softc *ahc =
*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
struct seeprom_config *sc = ahc->seep_config;
unsigned long flags;
struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
unsigned short scsirate;
struct ahc_devinfo devinfo;
char channel = starget->channel + 'A';
unsigned int our_id = ahc->our_id;
unsigned int target_offset;
target_offset = starget->id;
if (starget->channel != 0)
target_offset += 8;
if (starget->channel)
our_id = ahc->our_id_b;
ahc_lock(ahc, &flags);
BUG_ON(*ahc_targp != NULL);
*ahc_targp = starget;
if (sc) {
int maxsync = AHC_SYNCRATE_DT;
int ultra = 0;
int flags = sc->device_flags[target_offset];
if (ahc->flags & AHC_NEWEEPROM_FMT) {
if (flags & CFSYNCHISULTRA)
ultra = 1;
} else if (flags & CFULTRAEN)
ultra = 1;
/* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
* change it to ultra=0, CFXFER = 0 */
if(ultra && (flags & CFXFER) == 0x04) {
ultra = 0;
flags &= ~CFXFER;
}
if ((ahc->features & AHC_ULTRA2) != 0) {
scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
} else {
scsirate = (flags & CFXFER) << 4;
maxsync = ultra ? AHC_SYNCRATE_ULTRA :
AHC_SYNCRATE_FAST;
}
spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
if (!(flags & CFSYNCH))
spi_max_offset(starget) = 0;
spi_min_period(starget) =
ahc_find_period(ahc, scsirate, maxsync);
}
ahc_compile_devinfo(&devinfo, our_id, starget->id,
CAM_LUN_WILDCARD, channel,
ROLE_INITIATOR);
ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
AHC_TRANS_GOAL, /*paused*/FALSE);
ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
AHC_TRANS_GOAL, /*paused*/FALSE);
ahc_unlock(ahc, &flags);
return 0;
}
static void
ahc_linux_target_destroy(struct scsi_target *starget)
{
struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
*ahc_targp = NULL;
}
static int
ahc_linux_slave_alloc(struct scsi_device *sdev)
{
struct ahc_softc *ahc =
*((struct ahc_softc **)sdev->host->hostdata);
struct scsi_target *starget = sdev->sdev_target;
struct ahc_linux_device *dev;
if (bootverbose)
printk("%s: Slave Alloc %d\n", ahc_name(ahc), 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;
spi_period(starget) = 0;
return 0;
}
static int
ahc_linux_slave_configure(struct scsi_device *sdev)
{
if (bootverbose)
sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
ahc_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
ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int geom[])
{
int heads;
int sectors;
int cylinders;
int extended;
struct ahc_softc *ahc;
u_int channel;
ahc = *((struct ahc_softc **)sdev->host->hostdata);
channel = sdev_channel(sdev);
if (scsi_partsize(bdev, capacity, geom))
return 0;
heads = 64;
sectors = 32;
cylinders = aic_sector_div(capacity, heads, sectors);
if (aic7xxx_extended != 0)
extended = 1;
else if (channel == 0)
extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
else
extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 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
ahc_linux_abort(struct scsi_cmnd *cmd)
{
int error;
error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
if (error != 0)
printk("aic7xxx_abort returns 0x%x\n", error);
return (error);
}
/*
* Attempt to send a target reset message to the device that timed out.
*/
static int
ahc_linux_dev_reset(struct scsi_cmnd *cmd)
{
int error;
error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
if (error != 0)
printk("aic7xxx_dev_reset returns 0x%x\n", error);
return (error);
}
/*
* Reset the SCSI bus.
*/
static int
ahc_linux_bus_reset(struct scsi_cmnd *cmd)
{
struct ahc_softc *ahc;
int found;
unsigned long flags;
ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
ahc_lock(ahc, &flags);
found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
/*initiate reset*/TRUE);
ahc_unlock(ahc, &flags);
if (bootverbose)
printk("%s: SCSI bus reset delivered. "
"%d SCBs aborted.\n", ahc_name(ahc), found);
return SUCCESS;
}
struct scsi_host_template aic7xxx_driver_template = {
.module = THIS_MODULE,
.name = "aic7xxx",
.proc_name = "aic7xxx",
.show_info = ahc_linux_show_info,
.write_info = ahc_proc_write_seeprom,
.info = ahc_linux_info,
.queuecommand = ahc_linux_queue,
.eh_abort_handler = ahc_linux_abort,
.eh_device_reset_handler = ahc_linux_dev_reset,
.eh_bus_reset_handler = ahc_linux_bus_reset,
#if defined(__i386__)
.bios_param = ahc_linux_biosparam,
#endif
.can_queue = AHC_MAX_QUEUE,
.this_id = -1,
.max_sectors = 8192,
.cmd_per_lun = 2,
.slave_alloc = ahc_linux_slave_alloc,
.slave_configure = ahc_linux_slave_configure,
.target_alloc = ahc_linux_target_alloc,
.target_destroy = ahc_linux_target_destroy,
};
/**************************** Tasklet Handler *********************************/
/******************************** Macros **************************************/
#define BUILD_SCSIID(ahc, cmd) \
((((cmd)->device->id << TID_SHIFT) & TID) \
| (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
| (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
/******************************** Bus DMA *************************************/
int
ahc_dma_tag_create(struct ahc_softc *ahc, 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
ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
{
kfree(dmat);
}
int
ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
int flags, bus_dmamap_t *mapp)
{
/* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
*vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
if (*vaddr == NULL)
return ENOMEM;
return 0;
}
void
ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
void* vaddr, bus_dmamap_t map)
{
dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
}
int
ahc_dmamap_load(struct ahc_softc *ahc, 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
ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
{
}
int
ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
{
/* Nothing to do */
return (0);
}
static void
ahc_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(aic7xxx_tag_info); i++) {
for (j = 0; j < AHC_NUM_TARGETS; j++) {
aic7xxx_tag_info[i].tag_commands[j] = tags;
}
}
}
static void
ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
{
if ((instance >= 0) && (targ >= 0)
&& (instance < ARRAY_SIZE(aic7xxx_tag_info))
&& (targ < AHC_NUM_TARGETS)) {
aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
if (bootverbose)
printk("tag_info[%d:%d] = %d\n", instance, targ, value);
}
}
static char *
ahc_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. aic7xxx=stpwlev:1,extended
*/
static int
aic7xxx_setup(char *s)
{
int i, n;
char *p;
char *end;
static const struct {
const char *name;
uint32_t *flag;
} options[] = {
{ "extended", &aic7xxx_extended },
{ "no_reset", &aic7xxx_no_reset },
{ "verbose", &aic7xxx_verbose },
{ "allow_memio", &aic7xxx_allow_memio},
#ifdef AHC_DEBUG
{ "debug", &ahc_debug },
#endif
{ "periodic_otag", &aic7xxx_periodic_otag },
{ "pci_parity", &aic7xxx_pci_parity },
{ "seltime", &aic7xxx_seltime },
{ "tag_info", NULL },
{ "global_tag_depth", NULL },
{ "dv", NULL }
};
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) {
ahc_linux_setup_tag_info_global(p + n);
} else if (strncmp(p, "tag_info", n) == 0) {
s = ahc_parse_brace_option("tag_info", p + n, end,
2, ahc_linux_setup_tag_info, 0);
} else if (p[n] == ':') {
*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
} else if (strncmp(p, "verbose", n) == 0) {
*(options[i].flag) = 1;
} else {
*(options[i].flag) ^= 0xFFFFFFFF;
}
}
return 1;
}
__setup("aic7xxx=", aic7xxx_setup);
uint32_t aic7xxx_verbose;
int
ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
{
char buf[80];
struct Scsi_Host *host;
char *new_name;
u_long s;
int retval;
template->name = ahc->description;
host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
if (host == NULL)
return (ENOMEM);
*((struct ahc_softc **)host->hostdata) = ahc;
ahc->platform_data->host = host;
host->can_queue = AHC_MAX_QUEUE;
host->cmd_per_lun = 2;
/* XXX No way to communicate the ID for multiple channels */
host->this_id = ahc->our_id;
host->irq = ahc->platform_data->irq;
host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
host->max_lun = AHC_NUM_LUNS;
host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
host->sg_tablesize = AHC_NSEG;
ahc_lock(ahc, &s);
ahc_set_unit(ahc, ahc_linux_unit++);
ahc_unlock(ahc, &s);
sprintf(buf, "scsi%d", host->host_no);
new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
if (new_name != NULL) {
strcpy(new_name, buf);
ahc_set_name(ahc, new_name);
}
host->unique_id = ahc->unit;
ahc_linux_initialize_scsi_bus(ahc);
ahc_intr_enable(ahc, TRUE);
host->transportt = ahc_linux_transport_template;
retval = scsi_add_host(host, ahc->dev);
if (retval) {
printk(KERN_WARNING "aic7xxx: 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
ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
{
int i;
int numtarg;
unsigned long s;
i = 0;
numtarg = 0;
ahc_lock(ahc, &s);
if (aic7xxx_no_reset != 0)
ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
if ((ahc->flags & AHC_RESET_BUS_A) != 0)
ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
else
numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
if ((ahc->features & AHC_TWIN) != 0) {
if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
} else {
if (numtarg == 0)
i = 8;
numtarg += 8;
}
}
/*
* Force negotiation to async for all targets that
* will not see an initial bus reset.
*/
for (; i < numtarg; i++) {
struct ahc_devinfo devinfo;
struct ahc_initiator_tinfo *tinfo;
struct ahc_tmode_tstate *tstate;
u_int our_id;
u_int target_id;
char channel;
channel = 'A';
our_id = ahc->our_id;
target_id = i;
if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
channel = 'B';
our_id = ahc->our_id_b;
target_id = i % 8;
}
tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
target_id, &tstate);
ahc_compile_devinfo(&devinfo, our_id, target_id,
CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
ahc_update_neg_request(ahc, &devinfo, tstate,
tinfo, AHC_NEG_ALWAYS);
}
ahc_unlock(ahc, &s);
/* Give the bus some time to recover */
if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
ahc_linux_freeze_simq(ahc);
msleep(AIC7XXX_RESET_DELAY);
ahc_linux_release_simq(ahc);
}
}
int
ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
{
ahc->platform_data =
kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
if (ahc->platform_data == NULL)
return (ENOMEM);
ahc->platform_data->irq = AHC_LINUX_NOIRQ;
ahc_lockinit(ahc);
ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
if (aic7xxx_pci_parity == 0)
ahc->flags |= AHC_DISABLE_PCI_PERR;
return (0);
}
void
ahc_platform_free(struct ahc_softc *ahc)
{
struct scsi_target *starget;
int i;
if (ahc->platform_data != NULL) {
/* destroy all of the device and target objects */
for (i = 0; i < AHC_NUM_TARGETS; i++) {
starget = ahc->platform_data->starget[i];
if (starget != NULL) {
ahc->platform_data->starget[i] = NULL;
}
}
if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
free_irq(ahc->platform_data->irq, ahc);
if (ahc->tag == BUS_SPACE_PIO
&& ahc->bsh.ioport != 0)
release_region(ahc->bsh.ioport, 256);
if (ahc->tag == BUS_SPACE_MEMIO
&& ahc->bsh.maddr != NULL) {
iounmap(ahc->bsh.maddr);
release_mem_region(ahc->platform_data->mem_busaddr,
0x1000);
}
if (ahc->platform_data->host)
scsi_host_put(ahc->platform_data->host);
kfree(ahc->platform_data);
}
}
void
ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
{
ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
SCB_GET_CHANNEL(ahc, scb),
SCB_GET_LUN(scb), SCB_LIST_NULL,
ROLE_UNKNOWN, CAM_REQUEUE_REQ);
}
void
ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
struct ahc_devinfo *devinfo, ahc_queue_alg alg)
{
struct ahc_linux_device *dev;
int was_queuing;
int now_queuing;
if (sdev == NULL)
return;
dev = scsi_transport_device_data(sdev);
was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
switch (alg) {
default:
case AHC_QUEUE_NONE:
now_queuing = 0;
break;
case AHC_QUEUE_BASIC:
now_queuing = AHC_DEV_Q_BASIC;
break;
case AHC_QUEUE_TAGGED:
now_queuing = AHC_DEV_Q_TAGGED;
break;
}
if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
&& (was_queuing != now_queuing)
&& (dev->active != 0)) {
dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
dev->qfrozen++;
}
dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
if (now_queuing) {
u_int usertags;
usertags = ahc_linux_user_tagdepth(ahc, 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 == AHC_QUEUE_TAGGED) {
dev->flags |= AHC_DEV_Q_TAGGED;
if (aic7xxx_periodic_otag != 0)
dev->flags |= AHC_DEV_PERIODIC_OTAG;
} else
dev->flags |= AHC_DEV_Q_BASIC;
} else {
/* We can only have one opening. */
dev->maxtags = 0;
dev->openings = 1 - dev->active;
}
switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
case AHC_DEV_Q_BASIC:
case AHC_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, 2);
break;
}
}
int
ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
int lun, u_int tag, role_t role, uint32_t status)
{
return 0;
}
static u_int
ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
{
static int warned_user;
u_int tags;
tags = 0;
if ((ahc->user_discenable & devinfo->target_mask) != 0) {
if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
if (warned_user == 0) {
printk(KERN_WARNING
"aic7xxx: WARNING: Insufficient tag_info instances\n"
"aic7xxx: for installed controllers. Using defaults\n"
"aic7xxx: Please update the aic7xxx_tag_info array in\n"
"aic7xxx: the aic7xxx_osm..c source file.\n");
warned_user++;
}
tags = AHC_MAX_QUEUE;
} else {
adapter_tag_info_t *tag_info;
tag_info = &aic7xxx_tag_info[ahc->unit];
tags = tag_info->tag_commands[devinfo->target_offset];
if (tags > AHC_MAX_QUEUE)
tags = AHC_MAX_QUEUE;
}
}
return (tags);
}
/*
* Determines the queue depth for a given device.
*/
static void
ahc_linux_device_queue_depth(struct scsi_device *sdev)
{
struct ahc_devinfo devinfo;
u_int tags;
struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
ahc_compile_devinfo(&devinfo,
sdev->sdev_target->channel == 0
? ahc->our_id : ahc->our_id_b,
sdev->sdev_target->id, sdev->lun,
sdev->sdev_target->channel == 0 ? 'A' : 'B',
ROLE_INITIATOR);
tags = ahc_linux_user_tagdepth(ahc, &devinfo);
if (tags != 0 && sdev->tagged_supported != 0) {
ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
ahc_send_async(ahc, devinfo.channel, devinfo.target,
devinfo.lun, AC_TRANSFER_NEG);
ahc_print_devinfo(ahc, &devinfo);
printk("Tagged Queuing enabled. Depth %d\n", tags);
} else {
ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
ahc_send_async(ahc, devinfo.channel, devinfo.target,
devinfo.lun, AC_TRANSFER_NEG);
}
}
static int
ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
struct scsi_cmnd *cmd)
{
struct scb *scb;
struct hardware_scb *hscb;
struct ahc_initiator_tinfo *tinfo;
struct ahc_tmode_tstate *tstate;
uint16_t mask;
struct scb_tailq *untagged_q = NULL;
int nseg;
/*
* Schedule us to run later. The only reason we are not
* running is because the whole controller Q is frozen.
*/
if (ahc->platform_data->qfrozen != 0)
return SCSI_MLQUEUE_HOST_BUSY;
/*
* We only allow one untagged transaction
* per target in the initiator role unless
* we are storing a full busy target *lun*
* table in SCB space.
*/
if (!(cmd->flags & SCMD_TAGGED)
&& (ahc->features & AHC_SCB_BTT) == 0) {
int target_offset;
target_offset = cmd->device->id + cmd->device->channel * 8;
untagged_q = &(ahc->untagged_queues[target_offset]);
if (!TAILQ_EMPTY(untagged_q))
/* if we're already executing an untagged command
* we're busy to another */
return SCSI_MLQUEUE_DEVICE_BUSY;
}
nseg = scsi_dma_map(cmd);
if (nseg < 0)
return SCSI_MLQUEUE_HOST_BUSY;
/*
* Get an scb to use.
*/
scb = ahc_get_scb(ahc);
if (!scb) {
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(ahc, cmd);
hscb->lun = cmd->device->lun;
mask = SCB_GET_TARGET_MASK(ahc, scb);
tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
SCB_GET_OUR_ID(scb),
SCB_GET_TARGET(ahc, scb), &tstate);
hscb->scsirate = tinfo->scsirate;
hscb->scsioffset = tinfo->curr.offset;
if ((tstate->ultraenb & mask) != 0)
hscb->control |= ULTRAENB;
if ((ahc->user_discenable & mask) != 0)
hscb->control |= DISCENB;
if ((tstate->auto_negotiate & mask) != 0) {
scb->flags |= SCB_AUTO_NEGOTIATE;
scb->hscb->control |= MK_MESSAGE;
}
if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
&& (dev->flags & AHC_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;
if (hscb->cdb_len <= 12) {
memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
} else {
memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
scb->flags |= SCB_CDB32_PTR;
}
scb->platform_data->xfer_len = 0;
ahc_set_residual(scb, 0);
ahc_set_sense_residual(scb, 0);
scb->sg_count = 0;
if (nseg > 0) {
struct ahc_dma_seg *sg;
struct scatterlist *cur_seg;
int i;
/* Copy the segments into the SG list. */
sg = scb->sg_list;
/*
* The sg_count may be larger than nseg if
* a transfer crosses a 32bit page.
*/
scsi_for_each_sg(cmd, cur_seg, nseg, i) {
dma_addr_t addr;
bus_size_t len;
int consumed;
addr = sg_dma_address(cur_seg);
len = sg_dma_len(cur_seg);
consumed = ahc_linux_map_seg(ahc, scb,
sg, addr, len);
sg += consumed;
scb->sg_count += consumed;
}
sg--;
sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
/*
* Reset the sg list pointer.
*/
scb->hscb->sgptr =
ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
/*
* Copy the first SG into the "current"
* data pointer area.
*/
scb->hscb->dataptr = scb->sg_list->addr;
scb->hscb->datacnt = scb->sg_list->len;
} else {
scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
scb->hscb->dataptr = 0;
scb->hscb->datacnt = 0;
scb->sg_count = 0;
}
LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
dev->openings--;
dev->active++;
dev->commands_issued++;
if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
dev->commands_since_idle_or_otag++;
scb->flags |= SCB_ACTIVE;
if (untagged_q) {
TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
scb->flags |= SCB_UNTAGGEDQ;
}
ahc_queue_scb(ahc, scb);
return 0;
}
/*
* SCSI controller interrupt handler.
*/
irqreturn_t
ahc_linux_isr(int irq, void *dev_id)
{
struct ahc_softc *ahc;
u_long flags;
int ours;
ahc = (struct ahc_softc *) dev_id;
ahc_lock(ahc, &flags);
ours = ahc_intr(ahc);
ahc_unlock(ahc, &flags);
return IRQ_RETVAL(ours);
}
void
ahc_platform_flushwork(struct ahc_softc *ahc)
{
}
void
ahc_send_async(struct ahc_softc *ahc, char channel,
u_int target, u_int lun, ac_code code)
{
switch (code) {
case AC_TRANSFER_NEG:
{
struct scsi_target *starget;
struct ahc_initiator_tinfo *tinfo;
struct ahc_tmode_tstate *tstate;
int target_offset;
unsigned int target_ppr_options;
BUG_ON(target == CAM_TARGET_WILDCARD);
tinfo = ahc_fetch_transinfo(ahc, channel,
channel == 'A' ? ahc->our_id
: ahc->our_id_b,
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.
*/
target_offset = target;
if (channel == 'B')
target_offset += 8;
starget = ahc->platform_data->starget[target_offset];
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);
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_display_xfer_agreement(starget);
break;
}
case AC_SENT_BDR:
{
WARN_ON(lun != CAM_LUN_WILDCARD);
scsi_report_device_reset(ahc->platform_data->host,
channel - 'A', target);
break;
}
case AC_BUS_RESET:
if (ahc->platform_data->host != NULL) {
scsi_report_bus_reset(ahc->platform_data->host,
channel - 'A');
}
break;
default:
panic("ahc_send_async: Unexpected async event");
}
}
/*
* Calls the higher level scsi done function and frees the scb.
*/
void
ahc_done(struct ahc_softc *ahc, struct scb *scb)
{
struct scsi_cmnd *cmd;
struct ahc_linux_device *dev;
LIST_REMOVE(scb, pending_links);
if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
struct scb_tailq *untagged_q;
int target_offset;
target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
untagged_q = &(ahc->untagged_queues[target_offset]);
TAILQ_REMOVE(untagged_q, scb, links.tqe);
BUG_ON(!TAILQ_EMPTY(untagged_q));
} else if ((scb->flags & SCB_ACTIVE) == 0) {
/*
* Transactions aborted from the untagged queue may
* not have been dispatched to the controller, so
* only check the SCB_ACTIVE flag for tagged transactions.
*/
printk("SCB %d done'd twice\n", scb->hscb->tag);
ahc_dump_card_state(ahc);
panic("Stopping for safety");
}
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--;
}
ahc_linux_unmap_scb(ahc, 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 (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
#ifdef AHC_REPORT_UNDERFLOWS
uint32_t amount_xferred;
amount_xferred =
ahc_get_transfer_length(scb) - ahc_get_residual(scb);
#endif
if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
#ifdef AHC_DEBUG
if ((ahc_debug & AHC_SHOW_MISC) != 0) {
ahc_print_path(ahc, scb);
printk("Set CAM_UNCOR_PARITY\n");
}
#endif
ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
#ifdef AHC_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;
ahc_print_path(ahc, scb);
printk("CDB:");
for (i = 0; i < scb->io_ctx->cmd_len; i++)
printk(" 0x%x", scb->io_ctx->cmnd[i]);
printk("\n");
ahc_print_path(ahc, scb);
printk("Saw underflow (%ld of %ld bytes). "
"Treated as error\n",
ahc_get_residual(scb),
ahc_get_transfer_length(scb));
ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
#endif
} else {
ahc_set_transaction_status(scb, CAM_REQ_CMP);
}
} else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
}
if (dev->openings == 1
&& ahc_get_transaction_status(scb) == CAM_REQ_CMP
&& ahc_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 > AHC_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 (ahc_get_transaction_status(scb) == CAM_BDR_SENT
|| ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
if (ahc->platform_data->eh_done)
complete(ahc->platform_data->eh_done);
}
ahc_free_scb(ahc, scb);
ahc_linux_queue_cmd_complete(ahc, cmd);
}
static void
ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
struct scsi_device *sdev, struct scb *scb)
{
struct ahc_devinfo devinfo;
struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
ahc_compile_devinfo(&devinfo,
ahc->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 (ahc_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) {
u_int sense_size;
sense_size = min(sizeof(struct scsi_sense_data)
- ahc_get_sense_residual(scb),
(u_long)SCSI_SENSE_BUFFERSIZE);
memcpy(cmd->sense_buffer,
ahc_get_sense_buf(ahc, scb), sense_size);
if (sense_size < SCSI_SENSE_BUFFERSIZE)
memset(&cmd->sense_buffer[sense_size], 0,
SCSI_SENSE_BUFFERSIZE - sense_size);
cmd->result |= (DRIVER_SENSE << 24);
#ifdef AHC_DEBUG
if (ahc_debug & AHC_SHOW_SENSE) {
int i;
printk("Copied %d bytes of sense data:",
sense_size);
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;
/*
ahc_print_path(ahc, scb);
printk("Dropping tag count to %d\n", dev->active);
*/
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
== AHC_LOCK_TAGS_COUNT) {
dev->maxtags = dev->active;
ahc_print_path(ahc, 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;
}
ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
ahc_set_scsi_status(scb, SCSI_STATUS_OK);
ahc_platform_set_tags(ahc, sdev, &devinfo,
(dev->flags & AHC_DEV_Q_BASIC)
? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
break;
}
/*
* Drop down to a single opening, and treat this
* as if the target returned BUSY SCSI status.
*/
dev->openings = 1;
ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
ahc_platform_set_tags(ahc, sdev, &devinfo,
(dev->flags & AHC_DEV_Q_BASIC)
? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
break;
}
}
}
static void
ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
{
/*
* 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.
*/
{
u_int new_status;
switch (ahc_cmd_get_transaction_status(cmd)) {
case CAM_REQ_INPROG:
case CAM_REQ_CMP:
case CAM_SCSI_STATUS_ERROR:
new_status = DID_OK;
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;
break;
case CAM_CMD_TIMEOUT:
new_status = DID_TIME_OUT;
break;
case CAM_UA_ABORT:
case CAM_REQ_CMP_ERR:
case CAM_AUTOSENSE_FAIL:
case CAM_NO_HBA:
case CAM_DATA_RUN_ERR:
case CAM_UNEXP_BUSFREE:
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;
}
ahc_cmd_set_transaction_status(cmd, new_status);
}
cmd->scsi_done(cmd);
}
static void
ahc_linux_freeze_simq(struct ahc_softc *ahc)
{
unsigned long s;
ahc_lock(ahc, &s);
ahc->platform_data->qfrozen++;
if (ahc->platform_data->qfrozen == 1) {
scsi_block_requests(ahc->platform_data->host);
/* XXX What about Twin channels? */
ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
CAM_LUN_WILDCARD, SCB_LIST_NULL,
ROLE_INITIATOR, CAM_REQUEUE_REQ);
}
ahc_unlock(ahc, &s);
}
static void
ahc_linux_release_simq(struct ahc_softc *ahc)
{
u_long s;
int unblock_reqs;
unblock_reqs = 0;
ahc_lock(ahc, &s);
if (ahc->platform_data->qfrozen > 0)
ahc->platform_data->qfrozen--;
if (ahc->platform_data->qfrozen == 0)
unblock_reqs = 1;
ahc_unlock(ahc, &s);
/*
* There is still a race here. The mid-layer
* should keep its own freeze count and use
* a bottom half handler to run the queues
* so we can unblock with our own lock held.
*/
if (unblock_reqs)
scsi_unblock_requests(ahc->platform_data->host);
}
static int
ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
{
struct ahc_softc *ahc;
struct ahc_linux_device *dev;
struct scb *pending_scb;
u_int saved_scbptr;
u_int active_scb_index;
u_int last_phase;
u_int saved_scsiid;
u_int cdb_byte;
int retval;
int was_paused;
int paused;
int wait;
int disconnected;
unsigned long flags;
pending_scb = NULL;
paused = FALSE;
wait = FALSE;
ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
printk("CDB:");
for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
printk(" 0x%x", cmd->cmnd[cdb_byte]);
printk("\n");
ahc_lock(ahc, &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.
*/
printk("%s:%d:%d:%d: Is not an active device\n",
ahc_name(ahc), cmd->device->channel, cmd->device->id,
(u8)cmd->device->lun);
retval = SUCCESS;
goto no_cmd;
}
if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
&& ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
cmd->device->channel + 'A',
(u8)cmd->device->lun,
CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
printk("%s:%d:%d:%d: Command found on untagged queue\n",
ahc_name(ahc), cmd->device->channel, cmd->device->id,
(u8)cmd->device->lun);
retval = SUCCESS;
goto done;
}
/*
* See if we can find a matching cmd in the pending list.
*/
LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
if (pending_scb->io_ctx == cmd)
break;
}
if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
/* Any SCB for this device will do for a target reset */
LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
scmd_channel(cmd) + 'A',
CAM_LUN_WILDCARD,
SCB_LIST_NULL, ROLE_INITIATOR))
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 and that we didn't "just" miss
* an interrupt that would affect this cmd.
*/
was_paused = ahc_is_paused(ahc);
ahc_pause_and_flushwork(ahc);
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",
ahc_name(ahc), was_paused ? "" : "not ");
ahc_dump_card_state(ahc);
disconnected = TRUE;
if (flag == SCB_ABORT) {
if (ahc_search_qinfifo(ahc, 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",
ahc_name(ahc), cmd->device->channel,
cmd->device->id, (u8)cmd->device->lun);
retval = SUCCESS;
goto done;
}
} else if (ahc_search_qinfifo(ahc, cmd->device->id,
cmd->device->channel + 'A',
cmd->device->lun,
pending_scb->hscb->tag,
ROLE_INITIATOR, /*status*/0,
SEARCH_COUNT) > 0) {
disconnected = FALSE;
}
if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
struct scb *bus_scb;
bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
if (bus_scb == pending_scb)
disconnected = FALSE;
else if (flag != SCB_ABORT
&& ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
&& ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(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, is in the disconnected state, or we're hoping to find
* a command for the same target active on the bus to abuse to
* send a BDR. Queue the appropriate message based on which of
* these states we are in.
*/
last_phase = ahc_inb(ahc, LASTPHASE);
saved_scbptr = ahc_inb(ahc, SCBPTR);
active_scb_index = ahc_inb(ahc, SCB_TAG);
saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
if (last_phase != P_BUSFREE
&& (pending_scb->hscb->tag == active_scb_index
|| (flag == SCB_DEVICE_RESET
&& SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
/*
* We're active on the bus, so assert ATN
* and hope that the target responds.
*/
pending_scb = ahc_lookup_scb(ahc, active_scb_index);
pending_scb->flags |= SCB_RECOVERY_SCB|flag;
ahc_outb(ahc, MSG_OUT, HOST_MSG);
ahc_outb(ahc, 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.
* In either case (selection or reselection),
* we will now issue the approprate message
* to the timed-out device.
*
* Set the MK_MESSAGE control bit indicating
* that we desire to send a message. We
* also set the disconnected flag since
* in the paging case 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;
pending_scb->flags |= SCB_RECOVERY_SCB|flag;
/*
* Remove any cached copy of this SCB in the
* disconnected list in preparation for the
* queuing of our abort SCB. We use the
* same element in the SCB, SCB_NEXT, for
* both the qinfifo and the disconnected list.
*/
ahc_search_disc_list(ahc, cmd->device->id,
cmd->device->channel + 'A',
cmd->device->lun, pending_scb->hscb->tag,
/*stop_on_first*/TRUE,
/*remove*/TRUE,
/*save_state*/FALSE);
/*
* In the non-paging case, 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.
*/
if ((ahc->flags & AHC_PAGESCBS) == 0) {
ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
ahc_outb(ahc, SCB_CONTROL,
ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
}
/*
* Clear out any entries in the QINFIFO first
* so we are the next SCB for this target
* to run.
*/
ahc_search_qinfifo(ahc, cmd->device->id,
cmd->device->channel + 'A',
cmd->device->lun, SCB_LIST_NULL,
ROLE_INITIATOR, CAM_REQUEUE_REQ,
SEARCH_COMPLETE);
ahc_qinfifo_requeue_tail(ahc, pending_scb);
ahc_outb(ahc, SCBPTR, saved_scbptr);
ahc_print_path(ahc, 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)
ahc_unpause(ahc);
if (wait) {
DECLARE_COMPLETION_ONSTACK(done);
ahc->platform_data->eh_done = &done;
ahc_unlock(ahc, &flags);
printk("Recovery code sleeping\n");
if (!wait_for_completion_timeout(&done, 5 * HZ)) {
ahc_lock(ahc, &flags);
ahc->platform_data->eh_done = NULL;
ahc_unlock(ahc, &flags);
printk("Timer Expired\n");
retval = FAILED;
}
printk("Recovery code awake\n");
} else
ahc_unlock(ahc, &flags);
return (retval);
}
static void ahc_linux_set_width(struct scsi_target *starget, int width)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_devinfo devinfo;
unsigned long flags;
ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
ahc_lock(ahc, &flags);
ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
static void ahc_linux_set_period(struct scsi_target *starget, int period)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_tmode_tstate *tstate;
struct ahc_initiator_tinfo *tinfo
= ahc_fetch_transinfo(ahc,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahc_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options;
unsigned long flags;
unsigned long offset = tinfo->goal.offset;
const struct ahc_syncrate *syncrate;
if (offset == 0)
offset = MAX_OFFSET;
if (period < 9)
period = 9; /* 12.5ns is our minimum */
if (period == 9) {
if (spi_max_width(starget))
ppr_options |= MSG_EXT_PPR_DT_REQ;
else
/* need wide for DT and need DT for 12.5 ns */
period = 10;
}
ahc_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;
}
syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
ahc_lock(ahc, &flags);
ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
ppr_options, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_tmode_tstate *tstate;
struct ahc_initiator_tinfo *tinfo
= ahc_fetch_transinfo(ahc,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahc_devinfo devinfo;
unsigned int ppr_options = 0;
unsigned int period = 0;
unsigned long flags;
const struct ahc_syncrate *syncrate = NULL;
ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
if (offset != 0) {
syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
period = tinfo->goal.period;
ppr_options = tinfo->goal.ppr_options;
}
ahc_lock(ahc, &flags);
ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
ppr_options, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_tmode_tstate *tstate;
struct ahc_initiator_tinfo *tinfo
= ahc_fetch_transinfo(ahc,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahc_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;
const struct ahc_syncrate *syncrate;
if (dt && spi_max_width(starget)) {
ppr_options |= MSG_EXT_PPR_DT_REQ;
if (!width)
ahc_linux_set_width(starget, 1);
} else if (period == 9)
period = 10; /* if resetting DT, period must be >= 25ns */
ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
ahc_lock(ahc, &flags);
ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
ppr_options, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
#if 0
/* FIXME: This code claims to support IU and QAS. However, the actual
* sequencer code and aic7xxx_core have no support for these parameters and
* will get into a bad state if they're negotiated. Do not enable this
* unless you know what you're doing */
static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_tmode_tstate *tstate;
struct ahc_initiator_tinfo *tinfo
= ahc_fetch_transinfo(ahc,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahc_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_QAS_REQ;
unsigned int period = tinfo->goal.period;
unsigned long flags;
struct ahc_syncrate *syncrate;
if (qas)
ppr_options |= MSG_EXT_PPR_QAS_REQ;
ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
ahc_lock(ahc, &flags);
ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
ppr_options, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
struct ahc_tmode_tstate *tstate;
struct ahc_initiator_tinfo *tinfo
= ahc_fetch_transinfo(ahc,
starget->channel + 'A',
shost->this_id, starget->id, &tstate);
struct ahc_devinfo devinfo;
unsigned int ppr_options = tinfo->goal.ppr_options
& ~MSG_EXT_PPR_IU_REQ;
unsigned int period = tinfo->goal.period;
unsigned long flags;
struct ahc_syncrate *syncrate;
if (iu)
ppr_options |= MSG_EXT_PPR_IU_REQ;
ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
starget->channel + 'A', ROLE_INITIATOR);
syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
ahc_lock(ahc, &flags);
ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
ppr_options, AHC_TRANS_GOAL, FALSE);
ahc_unlock(ahc, &flags);
}
#endif
static void ahc_linux_get_signalling(struct Scsi_Host *shost)
{
struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
unsigned long flags;
u8 mode;
if (!(ahc->features & AHC_ULTRA2)) {
/* non-LVD chipset, may not have SBLKCTL reg */
spi_signalling(shost) =
ahc->features & AHC_HVD ?
SPI_SIGNAL_HVD :
SPI_SIGNAL_SE;
return;
}
ahc_lock(ahc, &flags);
ahc_pause(ahc);
mode = ahc_inb(ahc, SBLKCTL);
ahc_unpause(ahc);
ahc_unlock(ahc, &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 ahc_linux_transport_functions = {
.set_offset = ahc_linux_set_offset,
.show_offset = 1,
.set_period = ahc_linux_set_period,
.show_period = 1,
.set_width = ahc_linux_set_width,
.show_width = 1,
.set_dt = ahc_linux_set_dt,
.show_dt = 1,
#if 0
.set_iu = ahc_linux_set_iu,
.show_iu = 1,
.set_qas = ahc_linux_set_qas,
.show_qas = 1,
#endif
.get_signalling = ahc_linux_get_signalling,
};
static int __init
ahc_linux_init(void)
{
/*
* If we've been passed any parameters, process them now.
*/
if (aic7xxx)
aic7xxx_setup(aic7xxx);
ahc_linux_transport_template =
spi_attach_transport(&ahc_linux_transport_functions);
if (!ahc_linux_transport_template)
return -ENODEV;
scsi_transport_reserve_device(ahc_linux_transport_template,
sizeof(struct ahc_linux_device));
ahc_linux_pci_init();
ahc_linux_eisa_init();
return 0;
}
static void
ahc_linux_exit(void)
{
ahc_linux_pci_exit();
ahc_linux_eisa_exit();
spi_release_transport(ahc_linux_transport_template);
}
module_init(ahc_linux_init);
module_exit(ahc_linux_exit);
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