/* * 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 <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.
*/ typedefstruct {
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}} };
*/
/* * 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.
*/ staticchar *aic7xxx = NULL;
MODULE_AUTHOR("Maintainer: Hannes Reinecke ");
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: Set per-target tag depth\n" " global_tag_depth: Global tag depth for every target\n" " on every bus\n" " seltime: 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"
);
/************************** 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;
}
}
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);
}
/* Initial Domain Validation */ if (!spi_initial_dv(sdev->sdev_target))
spi_dv_device(sdev);
return 0;
}
#ifdefined(__i386__) /* * Return the disk geometry for the given SCSI device.
*/ staticint
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;
/******************************** 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);
}
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;
}
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;
staticchar *
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; elseif (instance != -1)
instance = -1;
opt_arg++; break; case',': case'.': if (instance == -1)
done = TRUE; elseif (targ >= 0)
targ++; elseif (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
*/ staticint
aic7xxx_setup(char *s)
{ int i, n; char *p; char *end;
/* * Place the SCSI bus into a known state by either resetting it, * or forcing transfer negotiations on the next command to any * target.
*/ staticvoid
ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
{ int i; int numtarg; unsignedlong 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_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)
{
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);
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;
} elseif (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;
}
/* * 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;
}
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;
/* * 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;
/* * 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));
} elseif ((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.
*/
} elseif (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);
}
} elseif (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) != SAM_STAT_TASK_SET_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);
}
/* * 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 SAM_STAT_CHECK_CONDITION: case SAM_STAT_COMMAND_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); #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 SAM_STAT_TASK_SET_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, SAM_STAT_GOOD);
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, SAM_STAT_BUSY);
ahc_platform_set_tags(ahc, sdev, &devinfo,
(dev->flags & AHC_DEV_Q_BASIC)
? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED); break;
}
}
}
staticvoid
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_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);
}
staticvoid
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);
}
staticint
ahc_linux_queue_recovery_cmd(struct scsi_device *sdev, struct scsi_cmnd *cmd)
{ struct ahc_softc *ahc; struct ahc_linux_device *dev; struct scb *pending_scb = NULL, *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; unsignedlong flags;
if (cmd) {
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(sdev);
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), sdev->channel, sdev->id, (u8)sdev->lun);
retval = SUCCESS; goto no_cmd;
}
/* * See if we can find a matching cmd in the pending list.
*/ if (cmd) {
LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) { if (scb->io_ctx == cmd) {
pending_scb = scb; break;
}
}
} else { /* Any SCB for this device will do for a target reset */
LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) { if (ahc_match_scb(ahc, scb, sdev->id,
sdev->channel + 'A',
CAM_LUN_WILDCARD,
SCB_LIST_NULL, ROLE_INITIATOR)) {
pending_scb = scb; break;
}
}
}
if (pending_scb == NULL) {
sdev_printk(KERN_INFO, sdev, "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;
/* * 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
|| (!cmd && SCSIID_TARGET(ahc, saved_scsiid) == sdev->id))) {
/* * 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;
pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
ahc_outb(ahc, MSG_OUT, HOST_MSG);
ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
sdev_printk(KERN_INFO, sdev, "Device is active, asserting ATN\n");
wait = TRUE;
} elseif (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;
pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
/* * 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, sdev->id,
sdev->channel + 'A',
sdev->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, sdev->id,
sdev->channel + 'A',
(u8)sdev->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 {
sdev_printk(KERN_INFO, sdev, "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);
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;
}
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