Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2196 insertions, 0 deletions

diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
new file mode 100644
index 00000000000..a1dff6d437b
--- /dev/null
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -0,0 +1,2196 @@
+/*
+ * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
+ * of PCI-SCSI IO processors.
+ *
+ * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
+ * Copyright (c) 2003-2005  Matthew Wilcox <matthew@wil.cx>
+ *
+ * This driver is derived from the Linux sym53c8xx driver.
+ * Copyright (C) 1998-2000  Gerard Roudier
+ *
+ * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
+ * a port of the FreeBSD ncr driver to Linux-1.2.13.
+ *
+ * The original ncr driver has been written for 386bsd and FreeBSD by
+ *         Wolfgang Stanglmeier        <wolf@cologne.de>
+ *         Stefan Esser                <se@mi.Uni-Koeln.de>
+ * Copyright (C) 1994  Wolfgang Stanglmeier
+ *
+ * Other major contributions:
+ *
+ * NVRAM detection and reading.
+ * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
+ *
+ *-----------------------------------------------------------------------------
+ *
+ * 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 of the License, 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_transport.h>
+
+#include "sym_glue.h"
+#include "sym_nvram.h"
+
+#define NAME53C		"sym53c"
+#define NAME53C8XX	"sym53c8xx"
+
+/* SPARC just has to be different ... */
+#ifdef __sparc__
+#define IRQ_FMT "%s"
+#define IRQ_PRM(x) __irq_itoa(x)
+#else
+#define IRQ_FMT "%d"
+#define IRQ_PRM(x) (x)
+#endif
+
+struct sym_driver_setup sym_driver_setup = SYM_LINUX_DRIVER_SETUP;
+unsigned int sym_debug_flags = 0;
+
+static char *excl_string;
+static char *safe_string;
+module_param_named(cmd_per_lun, sym_driver_setup.max_tag, ushort, 0);
+module_param_string(tag_ctrl, sym_driver_setup.tag_ctrl, 100, 0);
+module_param_named(burst, sym_driver_setup.burst_order, byte, 0);
+module_param_named(led, sym_driver_setup.scsi_led, byte, 0);
+module_param_named(diff, sym_driver_setup.scsi_diff, byte, 0);
+module_param_named(irqm, sym_driver_setup.irq_mode, byte, 0);
+module_param_named(buschk, sym_driver_setup.scsi_bus_check, byte, 0);
+module_param_named(hostid, sym_driver_setup.host_id, byte, 0);
+module_param_named(verb, sym_driver_setup.verbose, byte, 0);
+module_param_named(debug, sym_debug_flags, uint, 0);
+module_param_named(settle, sym_driver_setup.settle_delay, byte, 0);
+module_param_named(nvram, sym_driver_setup.use_nvram, byte, 0);
+module_param_named(excl, excl_string, charp, 0);
+module_param_named(safe, safe_string, charp, 0);
+
+MODULE_PARM_DESC(cmd_per_lun, "The maximum number of tags to use by default");
+MODULE_PARM_DESC(tag_ctrl, "More detailed control over tags per LUN");
+MODULE_PARM_DESC(burst, "Maximum burst.  0 to disable, 255 to read from registers");
+MODULE_PARM_DESC(led, "Set to 1 to enable LED support");
+MODULE_PARM_DESC(diff, "0 for no differential mode, 1 for BIOS, 2 for always, 3 for not GPIO3");
+MODULE_PARM_DESC(irqm, "0 for open drain, 1 to leave alone, 2 for totem pole");
+MODULE_PARM_DESC(buschk, "0 to not check, 1 for detach on error, 2 for warn on error");
+MODULE_PARM_DESC(hostid, "The SCSI ID to use for the host adapters");
+MODULE_PARM_DESC(verb, "0 for minimal verbosity, 1 for normal, 2 for excessive");
+MODULE_PARM_DESC(debug, "Set bits to enable debugging");
+MODULE_PARM_DESC(settle, "Settle delay in seconds.  Default 3");
+MODULE_PARM_DESC(nvram, "Option currently not used");
+MODULE_PARM_DESC(excl, "List ioport addresses here to prevent controllers from being attached");
+MODULE_PARM_DESC(safe, "Set other settings to a \"safe mode\"");
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(SYM_VERSION);
+MODULE_AUTHOR("Matthew Wilcox <matthew@wil.cx>");
+MODULE_DESCRIPTION("NCR, Symbios and LSI 8xx and 1010 PCI SCSI adapters");
+
+static void sym2_setup_params(void)
+{
+	char *p = excl_string;
+	int xi = 0;
+
+	while (p && (xi < 8)) {
+		char *next_p;
+		int val = (int) simple_strtoul(p, &next_p, 0);
+		sym_driver_setup.excludes[xi++] = val;
+		p = next_p;
+	}
+
+	if (safe_string) {
+		if (*safe_string == 'y') {
+			sym_driver_setup.max_tag = 0;
+			sym_driver_setup.burst_order = 0;
+			sym_driver_setup.scsi_led = 0;
+			sym_driver_setup.scsi_diff = 1;
+			sym_driver_setup.irq_mode = 0;
+			sym_driver_setup.scsi_bus_check = 2;
+			sym_driver_setup.host_id = 7;
+			sym_driver_setup.verbose = 2;
+			sym_driver_setup.settle_delay = 10;
+			sym_driver_setup.use_nvram = 1;
+		} else if (*safe_string != 'n') {
+			printk(KERN_WARNING NAME53C8XX "Ignoring parameter %s"
+					" passed to safe option", safe_string);
+		}
+	}
+}
+
+/*
+ * We used to try to deal with 64-bit BARs here, but don't any more.
+ * There are many parts of this driver which would need to be modified
+ * to handle a 64-bit base address, including scripts.  I'm uncomfortable
+ * with making those changes when I have no way of testing it, so I'm
+ * just going to disable it.
+ *
+ * Note that some machines (eg HP rx8620 and Superdome) have bus addresses
+ * below 4GB and physical addresses above 4GB.  These will continue to work.
+ */
+static int __devinit
+pci_get_base_address(struct pci_dev *pdev, int index, unsigned long *basep)
+{
+	u32 tmp;
+	unsigned long base;
+#define PCI_BAR_OFFSET(index) (PCI_BASE_ADDRESS_0 + (index<<2))
+
+	pci_read_config_dword(pdev, PCI_BAR_OFFSET(index++), &tmp);
+	base = tmp;
+	if ((tmp & 0x7) == PCI_BASE_ADDRESS_MEM_TYPE_64) {
+		pci_read_config_dword(pdev, PCI_BAR_OFFSET(index++), &tmp);
+		if (tmp > 0)
+			dev_err(&pdev->dev,
+				"BAR %d is 64-bit, disabling\n", index - 1);
+		base = 0;
+	}
+
+	if ((base & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
+		base &= PCI_BASE_ADDRESS_IO_MASK;
+	} else {
+		base &= PCI_BASE_ADDRESS_MEM_MASK;
+	}
+
+	*basep = base;
+	return index;
+#undef PCI_BAR_OFFSET
+}
+
+static struct scsi_transport_template *sym2_transport_template = NULL;
+
+/*
+ *  Used by the eh thread to wait for command completion.
+ *  It is allocated on the eh thread stack.
+ */
+struct sym_eh_wait {
+	struct completion done;
+	struct timer_list timer;
+	void (*old_done)(struct scsi_cmnd *);
+	int to_do;
+	int timed_out;
+};
+
+/*
+ *  Driver private area in the SCSI command structure.
+ */
+struct sym_ucmd {		/* Override the SCSI pointer structure */
+	dma_addr_t data_mapping;
+	u_char	data_mapped;
+	struct sym_eh_wait *eh_wait;
+};
+
+#define SYM_UCMD_PTR(cmd)  ((struct sym_ucmd *)(&(cmd)->SCp))
+#define SYM_SOFTC_PTR(cmd) sym_get_hcb(cmd->device->host)
+
+static void __unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	int dma_dir = cmd->sc_data_direction;
+
+	switch(SYM_UCMD_PTR(cmd)->data_mapped) {
+	case 2:
+		pci_unmap_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
+		break;
+	case 1:
+		pci_unmap_single(pdev, SYM_UCMD_PTR(cmd)->data_mapping,
+				 cmd->request_bufflen, dma_dir);
+		break;
+	}
+	SYM_UCMD_PTR(cmd)->data_mapped = 0;
+}
+
+static dma_addr_t __map_scsi_single_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	dma_addr_t mapping;
+	int dma_dir = cmd->sc_data_direction;
+
+	mapping = pci_map_single(pdev, cmd->request_buffer,
+				 cmd->request_bufflen, dma_dir);
+	if (mapping) {
+		SYM_UCMD_PTR(cmd)->data_mapped  = 1;
+		SYM_UCMD_PTR(cmd)->data_mapping = mapping;
+	}
+
+	return mapping;
+}
+
+static int __map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	int use_sg;
+	int dma_dir = cmd->sc_data_direction;
+
+	use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
+	if (use_sg > 0) {
+		SYM_UCMD_PTR(cmd)->data_mapped  = 2;
+		SYM_UCMD_PTR(cmd)->data_mapping = use_sg;
+	}
+
+	return use_sg;
+}
+
+#define unmap_scsi_data(np, cmd)	\
+		__unmap_scsi_data(np->s.device, cmd)
+#define map_scsi_single_data(np, cmd)	\
+		__map_scsi_single_data(np->s.device, cmd)
+#define map_scsi_sg_data(np, cmd)	\
+		__map_scsi_sg_data(np->s.device, cmd)
+/*
+ *  Complete a pending CAM CCB.
+ */
+void sym_xpt_done(struct sym_hcb *np, struct scsi_cmnd *cmd)
+{
+	unmap_scsi_data(np, cmd);
+	cmd->scsi_done(cmd);
+}
+
+static void sym_xpt_done2(struct sym_hcb *np, struct scsi_cmnd *cmd, int cam_status)
+{
+	sym_set_cam_status(cmd, cam_status);
+	sym_xpt_done(np, cmd);
+}
+
+
+/*
+ *  Tell the SCSI layer about a BUS RESET.
+ */
+void sym_xpt_async_bus_reset(struct sym_hcb *np)
+{
+	printf_notice("%s: SCSI BUS has been reset.\n", sym_name(np));
+	np->s.settle_time = jiffies + sym_driver_setup.settle_delay * HZ;
+	np->s.settle_time_valid = 1;
+	if (sym_verbose >= 2)
+		printf_info("%s: command processing suspended for %d seconds\n",
+			    sym_name(np), sym_driver_setup.settle_delay);
+}
+
+/*
+ *  Tell the SCSI layer about a BUS DEVICE RESET message sent.
+ */
+void sym_xpt_async_sent_bdr(struct sym_hcb *np, int target)
+{
+	printf_notice("%s: TARGET %d has been reset.\n", sym_name(np), target);
+}
+
+/*
+ *  Choose the more appropriate CAM status if 
+ *  the IO encountered an extended error.
+ */
+static int sym_xerr_cam_status(int cam_status, int x_status)
+{
+	if (x_status) {
+		if	(x_status & XE_PARITY_ERR)
+			cam_status = DID_PARITY;
+		else if	(x_status &(XE_EXTRA_DATA|XE_SODL_UNRUN|XE_SWIDE_OVRUN))
+			cam_status = DID_ERROR;
+		else if	(x_status & XE_BAD_PHASE)
+			cam_status = DID_ERROR;
+		else
+			cam_status = DID_ERROR;
+	}
+	return cam_status;
+}
+
+/*
+ *  Build CAM result for a failed or auto-sensed IO.
+ */
+void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
+{
+	struct scsi_cmnd *cmd = cp->cmd;
+	u_int cam_status, scsi_status, drv_status;
+
+	drv_status  = 0;
+	cam_status  = DID_OK;
+	scsi_status = cp->ssss_status;
+
+	if (cp->host_flags & HF_SENSE) {
+		scsi_status = cp->sv_scsi_status;
+		resid = cp->sv_resid;
+		if (sym_verbose && cp->sv_xerr_status)
+			sym_print_xerr(cmd, cp->sv_xerr_status);
+		if (cp->host_status == HS_COMPLETE &&
+		    cp->ssss_status == S_GOOD &&
+		    cp->xerr_status == 0) {
+			cam_status = sym_xerr_cam_status(DID_OK,
+							 cp->sv_xerr_status);
+			drv_status = DRIVER_SENSE;
+			/*
+			 *  Bounce back the sense data to user.
+			 */
+			memset(&cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
+			memcpy(cmd->sense_buffer, cp->sns_bbuf,
+			      min(sizeof(cmd->sense_buffer),
+				  (size_t)SYM_SNS_BBUF_LEN));
+#if 0
+			/*
+			 *  If the device reports a UNIT ATTENTION condition 
+			 *  due to a RESET condition, we should consider all 
+			 *  disconnect CCBs for this unit as aborted.
+			 */
+			if (1) {
+				u_char *p;
+				p  = (u_char *) cmd->sense_data;
+				if (p[0]==0x70 && p[2]==0x6 && p[12]==0x29)
+					sym_clear_tasks(np, DID_ABORT,
+							cp->target,cp->lun, -1);
+			}
+#endif
+		} else {
+			/*
+			 * Error return from our internal request sense.  This
+			 * is bad: we must clear the contingent allegiance
+			 * condition otherwise the device will always return
+			 * BUSY.  Use a big stick.
+			 */
+			sym_reset_scsi_target(np, cmd->device->id);
+			cam_status = DID_ERROR;
+		}
+	} else if (cp->host_status == HS_COMPLETE) 	/* Bad SCSI status */
+		cam_status = DID_OK;
+	else if (cp->host_status == HS_SEL_TIMEOUT)	/* Selection timeout */
+		cam_status = DID_NO_CONNECT;
+	else if (cp->host_status == HS_UNEXPECTED)	/* Unexpected BUS FREE*/
+		cam_status = DID_ERROR;
+	else {						/* Extended error */
+		if (sym_verbose) {
+			sym_print_addr(cmd, "COMMAND FAILED (%x %x %x).\n",
+				cp->host_status, cp->ssss_status,
+				cp->xerr_status);
+		}
+		/*
+		 *  Set the most appropriate value for CAM status.
+		 */
+		cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
+	}
+	cmd->resid = resid;
+	cmd->result = (drv_status << 24) + (cam_status << 16) + scsi_status;
+}
+
+
+/*
+ *  Build the scatter/gather array for an I/O.
+ */
+
+static int sym_scatter_no_sglist(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
+{
+	struct sym_tblmove *data = &cp->phys.data[SYM_CONF_MAX_SG-1];
+	int segment;
+
+	cp->data_len = cmd->request_bufflen;
+
+	if (cmd->request_bufflen) {
+		dma_addr_t baddr = map_scsi_single_data(np, cmd);
+		if (baddr) {
+			sym_build_sge(np, data, baddr, cmd->request_bufflen);
+			segment = 1;
+		} else {
+			segment = -2;
+		}
+	} else {
+		segment = 0;
+	}
+
+	return segment;
+}
+
+static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
+{
+	int segment;
+	int use_sg = (int) cmd->use_sg;
+
+	cp->data_len = 0;
+
+	if (!use_sg)
+		segment = sym_scatter_no_sglist(np, cp, cmd);
+	else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
+		struct scatterlist *scatter = (struct scatterlist *)cmd->buffer;
+		struct sym_tblmove *data;
+
+		if (use_sg > SYM_CONF_MAX_SG) {
+			unmap_scsi_data(np, cmd);
+			return -1;
+		}
+
+		data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
+
+		for (segment = 0; segment < use_sg; segment++) {
+			dma_addr_t baddr = sg_dma_address(&scatter[segment]);
+			unsigned int len = sg_dma_len(&scatter[segment]);
+
+			sym_build_sge(np, &data[segment], baddr, len);
+			cp->data_len += len;
+		}
+	} else {
+		segment = -2;
+	}
+
+	return segment;
+}
+
+/*
+ *  Queue a SCSI command.
+ */
+static int sym_queue_command(struct sym_hcb *np, struct scsi_cmnd *cmd)
+{
+	struct scsi_device *sdev = cmd->device;
+	struct sym_tcb *tp;
+	struct sym_lcb *lp;
+	struct sym_ccb *cp;
+	int	order;
+
+	/*
+	 *  Minimal checkings, so that we will not 
+	 *  go outside our tables.
+	 */
+	if (sdev->id == np->myaddr ||
+	    sdev->id >= SYM_CONF_MAX_TARGET ||
+	    sdev->lun >= SYM_CONF_MAX_LUN) {
+		sym_xpt_done2(np, cmd, CAM_DEV_NOT_THERE);
+		return 0;
+	}
+
+	/*
+	 *  Retrieve the target descriptor.
+	 */
+	tp = &np->target[sdev->id];
+
+	/*
+	 *  Complete the 1st INQUIRY command with error 
+	 *  condition if the device is flagged NOSCAN 
+	 *  at BOOT in the NVRAM. This may speed up 
+	 *  the boot and maintain coherency with BIOS 
+	 *  device numbering. Clearing the flag allows 
+	 *  user to rescan skipped devices later.
+	 *  We also return error for devices not flagged 
+	 *  for SCAN LUNS in the NVRAM since some mono-lun 
+	 *  devices behave badly when asked for some non 
+	 *  zero LUN. Btw, this is an absolute hack.:-)
+	 */
+	if (cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 0x0) {
+		if ((tp->usrflags & SYM_SCAN_BOOT_DISABLED) ||
+		    ((tp->usrflags & SYM_SCAN_LUNS_DISABLED) && 
+		     sdev->lun != 0)) {
+			tp->usrflags &= ~SYM_SCAN_BOOT_DISABLED;
+			sym_xpt_done2(np, cmd, CAM_DEV_NOT_THERE);
+			return 0;
+		}
+	}
+
+	/*
+	 *  Select tagged/untagged.
+	 */
+	lp = sym_lp(tp, sdev->lun);
+	order = (lp && lp->s.reqtags) ? M_SIMPLE_TAG : 0;
+
+	/*
+	 *  Queue the SCSI IO.
+	 */
+	cp = sym_get_ccb(np, cmd, order);
+	if (!cp)
+		return 1;	/* Means resource shortage */
+	sym_queue_scsiio(np, cmd, cp);
+	return 0;
+}
+
+/*
+ *  Setup buffers and pointers that address the CDB.
+ */
+static inline int sym_setup_cdb(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
+{
+	u32	cmd_ba;
+	int	cmd_len;
+
+	/*
+	 *  CDB is 16 bytes max.
+	 */
+	if (cmd->cmd_len > sizeof(cp->cdb_buf)) {
+		sym_set_cam_status(cp->cmd, CAM_REQ_INVALID);
+		return -1;
+	}
+
+	memcpy(cp->cdb_buf, cmd->cmnd, cmd->cmd_len);
+	cmd_ba  = CCB_BA (cp, cdb_buf[0]);
+	cmd_len = cmd->cmd_len;
+
+	cp->phys.cmd.addr	= cpu_to_scr(cmd_ba);
+	cp->phys.cmd.size	= cpu_to_scr(cmd_len);
+
+	return 0;
+}
+
+/*
+ *  Setup pointers that address the data and start the I/O.
+ */
+int sym_setup_data_and_start(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
+{
+	int dir;
+	struct sym_tcb *tp = &np->target[cp->target];
+	struct sym_lcb *lp = sym_lp(tp, cp->lun);
+
+	/*
+	 *  Build the CDB.
+	 */
+	if (sym_setup_cdb(np, cmd, cp))
+		goto out_abort;
+
+	/*
+	 *  No direction means no data.
+	 */
+	dir = cmd->sc_data_direction;
+	if (dir != DMA_NONE) {
+		cp->segments = sym_scatter(np, cp, cmd);
+		if (cp->segments < 0) {
+			if (cp->segments == -2)
+				sym_set_cam_status(cmd, CAM_RESRC_UNAVAIL);
+			else
+				sym_set_cam_status(cmd, CAM_REQ_TOO_BIG);
+			goto out_abort;
+		}
+	} else {
+		cp->data_len = 0;
+		cp->segments = 0;
+	}
+
+	/*
+	 *  Set data pointers.
+	 */
+	sym_setup_data_pointers(np, cp, dir);
+
+	/*
+	 *  When `#ifed 1', the code below makes the driver 
+	 *  panic on the first attempt to write to a SCSI device.
+	 *  It is the first test we want to do after a driver 
+	 *  change that does not seem obviously safe. :)
+	 */
+#if 0
+	switch (cp->cdb_buf[0]) {
+	case 0x0A: case 0x2A: case 0xAA:
+		panic("XXXXXXXXXXXXX WRITE NOT YET ALLOWED XXXXXXXXXXXXXX\n");
+		break;
+	default:
+		break;
+	}
+#endif
+
+	/*
+	 *	activate this job.
+	 */
+	if (lp)
+		sym_start_next_ccbs(np, lp, 2);
+	else
+		sym_put_start_queue(np, cp);
+	return 0;
+
+out_abort:
+	sym_free_ccb(np, cp);
+	sym_xpt_done(np, cmd);
+	return 0;
+}
+
+
+/*
+ *  timer daemon.
+ *
+ *  Misused to keep the driver running when
+ *  interrupts are not configured correctly.
+ */
+static void sym_timer(struct sym_hcb *np)
+{
+	unsigned long thistime = jiffies;
+
+	/*
+	 *  Restart the timer.
+	 */
+	np->s.timer.expires = thistime + SYM_CONF_TIMER_INTERVAL;
+	add_timer(&np->s.timer);
+
+	/*
+	 *  If we are resetting the ncr, wait for settle_time before 
+	 *  clearing it. Then command processing will be resumed.
+	 */
+	if (np->s.settle_time_valid) {
+		if (time_before_eq(np->s.settle_time, thistime)) {
+			if (sym_verbose >= 2 )
+				printk("%s: command processing resumed\n",
+				       sym_name(np));
+			np->s.settle_time_valid = 0;
+		}
+		return;
+	}
+
+	/*
+	 *	Nothing to do for now, but that may come.
+	 */
+	if (np->s.lasttime + 4*HZ < thistime) {
+		np->s.lasttime = thistime;
+	}
+
+#ifdef SYM_CONF_PCIQ_MAY_MISS_COMPLETIONS
+	/*
+	 *  Some way-broken PCI bridges may lead to 
+	 *  completions being lost when the clearing 
+	 *  of the INTFLY flag by the CPU occurs 
+	 *  concurrently with the chip raising this flag.
+	 *  If this ever happen, lost completions will 
+	 * be reaped here.
+	 */
+	sym_wakeup_done(np);
+#endif
+}
+
+
+/*
+ *  PCI BUS error handler.
+ */
+void sym_log_bus_error(struct sym_hcb *np)
+{
+	u_short pci_sts;
+	pci_read_config_word(np->s.device, PCI_STATUS, &pci_sts);
+	if (pci_sts & 0xf900) {
+		pci_write_config_word(np->s.device, PCI_STATUS, pci_sts);
+		printf("%s: PCI STATUS = 0x%04x\n",
+			sym_name(np), pci_sts & 0xf900);
+	}
+}
+
+/*
+ * queuecommand method.  Entered with the host adapter lock held and
+ * interrupts disabled.
+ */
+static int sym53c8xx_queue_command(struct scsi_cmnd *cmd,
+					void (*done)(struct scsi_cmnd *))
+{
+	struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
+	struct sym_ucmd *ucp = SYM_UCMD_PTR(cmd);
+	int sts = 0;
+
+	cmd->scsi_done     = done;
+	memset(ucp, 0, sizeof(*ucp));
+
+	/*
+	 *  Shorten our settle_time if needed for 
+	 *  this command not to time out.
+	 */
+	if (np->s.settle_time_valid && cmd->timeout_per_command) {
+		unsigned long tlimit = jiffies + cmd->timeout_per_command;
+		tlimit -= SYM_CONF_TIMER_INTERVAL*2;
+		if (time_after(np->s.settle_time, tlimit)) {
+			np->s.settle_time = tlimit;
+		}
+	}
+
+	if (np->s.settle_time_valid)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	sts = sym_queue_command(np, cmd);
+	if (sts)
+		return SCSI_MLQUEUE_HOST_BUSY;
+	return 0;
+}
+
+/*
+ *  Linux entry point of the interrupt handler.
+ */
+static irqreturn_t sym53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs)
+{
+	unsigned long flags;
+	struct sym_hcb *np = (struct sym_hcb *)dev_id;
+
+	if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
+
+	spin_lock_irqsave(np->s.host->host_lock, flags);
+	sym_interrupt(np);
+	spin_unlock_irqrestore(np->s.host->host_lock, flags);
+
+	if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("]\n");
+
+	return IRQ_HANDLED;
+}
+
+/*
+ *  Linux entry point of the timer handler
+ */
+static void sym53c8xx_timer(unsigned long npref)
+{
+	struct sym_hcb *np = (struct sym_hcb *)npref;
+	unsigned long flags;
+
+	spin_lock_irqsave(np->s.host->host_lock, flags);
+	sym_timer(np);
+	spin_unlock_irqrestore(np->s.host->host_lock, flags);
+}
+
+
+/*
+ *  What the eh thread wants us to perform.
+ */
+#define SYM_EH_ABORT		0
+#define SYM_EH_DEVICE_RESET	1
+#define SYM_EH_BUS_RESET	2
+#define SYM_EH_HOST_RESET	3
+
+/*
+ *  What we will do regarding the involved SCSI command.
+ */
+#define SYM_EH_DO_IGNORE	0
+#define SYM_EH_DO_COMPLETE	1
+#define SYM_EH_DO_WAIT		2
+
+/*
+ *  Our general completion handler.
+ */
+static void __sym_eh_done(struct scsi_cmnd *cmd, int timed_out)
+{
+	struct sym_eh_wait *ep = SYM_UCMD_PTR(cmd)->eh_wait;
+	if (!ep)
+		return;
+
+	/* Try to avoid a race here (not 100% safe) */
+	if (!timed_out) {
+		ep->timed_out = 0;
+		if (ep->to_do == SYM_EH_DO_WAIT && !del_timer(&ep->timer))
+			return;
+	}
+
+	/* Revert everything */
+	SYM_UCMD_PTR(cmd)->eh_wait = NULL;
+	cmd->scsi_done = ep->old_done;
+
+	/* Wake up the eh thread if it wants to sleep */
+	if (ep->to_do == SYM_EH_DO_WAIT)
+		complete(&ep->done);
+}
+
+/*
+ *  scsi_done() alias when error recovery is in progress. 
+ */
+static void sym_eh_done(struct scsi_cmnd *cmd) { __sym_eh_done(cmd, 0); }
+
+/*
+ *  Some timeout handler to avoid waiting too long.
+ */
+static void sym_eh_timeout(u_long p) { __sym_eh_done((struct scsi_cmnd *)p, 1); }
+
+/*
+ *  Generic method for our eh processing.
+ *  The 'op' argument tells what we have to do.
+ */
+static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd)
+{
+	struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
+	SYM_QUEHEAD *qp;
+	int to_do = SYM_EH_DO_IGNORE;
+	int sts = -1;
+	struct sym_eh_wait eh, *ep = &eh;
+
+	dev_warn(&cmd->device->sdev_gendev, "%s operation started.\n", opname);
+
+#if 0
+	/* This one should be the result of some race, thus to ignore */
+	if (cmd->serial_number != cmd->serial_number_at_timeout)
+		goto prepare;
+#endif
+
+	/* This one is queued in some place -> to wait for completion */
+	FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
+		struct sym_ccb *cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
+		if (cp->cmd == cmd) {
+			to_do = SYM_EH_DO_WAIT;
+			goto prepare;
+		}
+	}
+
+prepare:
+	/* Prepare stuff to either ignore, complete or wait for completion */
+	switch(to_do) {
+	default:
+	case SYM_EH_DO_IGNORE:
+		break;
+	case SYM_EH_DO_WAIT:
+		init_completion(&ep->done);
+		/* fall through */
+	case SYM_EH_DO_COMPLETE:
+		ep->old_done = cmd->scsi_done;
+		cmd->scsi_done = sym_eh_done;
+		SYM_UCMD_PTR(cmd)->eh_wait = ep;
+	}
+
+	/* Try to proceed the operation we have been asked for */
+	sts = -1;
+	switch(op) {
+	case SYM_EH_ABORT:
+		sts = sym_abort_scsiio(np, cmd, 1);
+		break;
+	case SYM_EH_DEVICE_RESET:
+		sts = sym_reset_scsi_target(np, cmd->device->id);
+		break;
+	case SYM_EH_BUS_RESET:
+		sym_reset_scsi_bus(np, 1);
+		sts = 0;
+		break;
+	case SYM_EH_HOST_RESET:
+		sym_reset_scsi_bus(np, 0);
+		sym_start_up (np, 1);
+		sts = 0;
+		break;
+	default:
+		break;
+	}
+
+	/* On error, restore everything and cross fingers :) */
+	if (sts) {
+		SYM_UCMD_PTR(cmd)->eh_wait = NULL;
+		cmd->scsi_done = ep->old_done;
+		to_do = SYM_EH_DO_IGNORE;
+	}
+
+	ep->to_do = to_do;
+	/* Complete the command with locks held as required by the driver */
+	if (to_do == SYM_EH_DO_COMPLETE)
+		sym_xpt_done2(np, cmd, CAM_REQ_ABORTED);
+
+	/* Wait for completion with locks released, as required by kernel */
+	if (to_do == SYM_EH_DO_WAIT) {
+		init_timer(&ep->timer);
+		ep->timer.expires = jiffies + (5*HZ);
+		ep->timer.function = sym_eh_timeout;
+		ep->timer.data = (u_long)cmd;
+		ep->timed_out = 1;	/* Be pessimistic for once :) */
+		add_timer(&ep->timer);
+		spin_unlock_irq(np->s.host->host_lock);
+		wait_for_completion(&ep->done);
+		spin_lock_irq(np->s.host->host_lock);
+		if (ep->timed_out)
+			sts = -2;
+	}
+	dev_warn(&cmd->device->sdev_gendev, "%s operation %s.\n", opname,
+			sts==0 ? "complete" :sts==-2 ? "timed-out" : "failed");
+	return sts ? SCSI_FAILED : SCSI_SUCCESS;
+}
+
+
+/*
+ * Error handlers called from the eh thread (one thread per HBA).
+ */
+static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
+{
+	return sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
+}
+
+static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+	return sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
+}
+
+static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
+{
+	return sym_eh_handler(SYM_EH_BUS_RESET, "BUS RESET", cmd);
+}
+
+static int sym53c8xx_eh_host_reset_handler(struct scsi_cmnd *cmd)
+{
+	return sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
+}
+
+/*
+ *  Tune device queuing depth, according to various limits.
+ */
+static void sym_tune_dev_queuing(struct sym_tcb *tp, int lun, u_short reqtags)
+{
+	struct sym_lcb *lp = sym_lp(tp, lun);
+	u_short	oldtags;
+
+	if (!lp)
+		return;
+
+	oldtags = lp->s.reqtags;
+
+	if (reqtags > lp->s.scdev_depth)
+		reqtags = lp->s.scdev_depth;
+
+	lp->started_limit = reqtags ? reqtags : 2;
+	lp->started_max   = 1;
+	lp->s.reqtags     = reqtags;
+
+	if (reqtags != oldtags) {
+		dev_info(&tp->sdev->sdev_target->dev,
+		         "tagged command queuing %s, command queue depth %d.\n",
+		          lp->s.reqtags ? "enabled" : "disabled",
+ 		          lp->started_limit);
+	}
+}
+
+/*
+ *  Linux select queue depths function
+ */
+#define DEF_DEPTH	(sym_driver_setup.max_tag)
+#define ALL_TARGETS	-2
+#define NO_TARGET	-1
+#define ALL_LUNS	-2
+#define NO_LUN		-1
+
+static int device_queue_depth(struct sym_hcb *np, int target, int lun)
+{
+	int c, h, t, u, v;
+	char *p = sym_driver_setup.tag_ctrl;
+	char *ep;
+
+	h = -1;
+	t = NO_TARGET;
+	u = NO_LUN;
+	while ((c = *p++) != 0) {
+		v = simple_strtoul(p, &ep, 0);
+		switch(c) {
+		case '/':
+			++h;
+			t = ALL_TARGETS;
+			u = ALL_LUNS;
+			break;
+		case 't':
+			if (t != target)
+				t = (target == v) ? v : NO_TARGET;
+			u = ALL_LUNS;
+			break;
+		case 'u':
+			if (u != lun)
+				u = (lun == v) ? v : NO_LUN;
+			break;
+		case 'q':
+			if (h == np->s.unit &&
+				(t == ALL_TARGETS || t == target) &&
+				(u == ALL_LUNS    || u == lun))
+				return v;
+			break;
+		case '-':
+			t = ALL_TARGETS;
+			u = ALL_LUNS;
+			break;
+		default:
+			break;
+		}
+		p = ep;
+	}
+	return DEF_DEPTH;
+}
+
+static int sym53c8xx_slave_alloc(struct scsi_device *device)
+{
+	struct sym_hcb *np = sym_get_hcb(device->host);
+	struct sym_tcb *tp = &np->target[device->id];
+	if (!tp->sdev)
+		tp->sdev = device;
+
+	return 0;
+}
+
+static void sym53c8xx_slave_destroy(struct scsi_device *device)
+{
+	struct sym_hcb *np = sym_get_hcb(device->host);
+	struct sym_tcb *tp = &np->target[device->id];
+	if (tp->sdev == device)
+		tp->sdev = NULL;
+}
+
+/*
+ * Linux entry point for device queue sizing.
+ */
+static int sym53c8xx_slave_configure(struct scsi_device *device)
+{
+	struct sym_hcb *np = sym_get_hcb(device->host);
+	struct sym_tcb *tp = &np->target[device->id];
+	struct sym_lcb *lp;
+	int reqtags, depth_to_use;
+
+	/*
+	 *  Allocate the LCB if not yet.
+	 *  If it fail, we may well be in the sh*t. :)
+	 */
+	lp = sym_alloc_lcb(np, device->id, device->lun);
+	if (!lp)
+		return -ENOMEM;
+
+	/*
+	 *  Get user flags.
+	 */
+	lp->curr_flags = lp->user_flags;
+
+	/*
+	 *  Select queue depth from driver setup.
+	 *  Donnot use more than configured by user.
+	 *  Use at least 2.
+	 *  Donnot use more than our maximum.
+	 */
+	reqtags = device_queue_depth(np, device->id, device->lun);
+	if (reqtags > tp->usrtags)
+		reqtags = tp->usrtags;
+	if (!device->tagged_supported)
+		reqtags = 0;
+#if 1 /* Avoid to locally queue commands for no good reasons */
+	if (reqtags > SYM_CONF_MAX_TAG)
+		reqtags = SYM_CONF_MAX_TAG;
+	depth_to_use = (reqtags ? reqtags : 2);
+#else
+	depth_to_use = (reqtags ? SYM_CONF_MAX_TAG : 2);
+#endif
+	scsi_adjust_queue_depth(device,
+				(device->tagged_supported ?
+				 MSG_SIMPLE_TAG : 0),
+				depth_to_use);
+	lp->s.scdev_depth = depth_to_use;
+	sym_tune_dev_queuing(tp, device->lun, reqtags);
+
+	if (!spi_initial_dv(device->sdev_target))
+		spi_dv_device(device);
+
+	return 0;
+}
+
+/*
+ *  Linux entry point for info() function
+ */
+static const char *sym53c8xx_info (struct Scsi_Host *host)
+{
+	return SYM_DRIVER_NAME;
+}
+
+
+#ifdef SYM_LINUX_PROC_INFO_SUPPORT
+/*
+ *  Proc file system stuff
+ *
+ *  A read operation returns adapter information.
+ *  A write operation is a control command.
+ *  The string is parsed in the driver code and the command is passed 
+ *  to the sym_usercmd() function.
+ */
+
+#ifdef SYM_LINUX_USER_COMMAND_SUPPORT
+
+struct	sym_usrcmd {
+	u_long	target;
+	u_long	lun;
+	u_long	data;
+	u_long	cmd;
+};
+
+#define UC_SETSYNC      10
+#define UC_SETTAGS	11
+#define UC_SETDEBUG	12
+#define UC_SETWIDE	14
+#define UC_SETFLAG	15
+#define UC_SETVERBOSE	17
+#define UC_RESETDEV	18
+#define UC_CLEARDEV	19
+
+static void sym_exec_user_command (struct sym_hcb *np, struct sym_usrcmd *uc)
+{
+	struct sym_tcb *tp;
+	int t, l;
+
+	switch (uc->cmd) {
+	case 0: return;
+
+#ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
+	case UC_SETDEBUG:
+		sym_debug_flags = uc->data;
+		break;
+#endif
+	case UC_SETVERBOSE:
+		np->verbose = uc->data;
+		break;
+	default:
+		/*
+		 * We assume that other commands apply to targets.
+		 * This should always be the case and avoid the below 
+		 * 4 lines to be repeated 6 times.
+		 */
+		for (t = 0; t < SYM_CONF_MAX_TARGET; t++) {
+			if (!((uc->target >> t) & 1))
+				continue;
+			tp = &np->target[t];
+
+			switch (uc->cmd) {
+
+			case UC_SETSYNC:
+				if (!uc->data || uc->data >= 255) {
+					tp->tgoal.iu = tp->tgoal.dt =
+						tp->tgoal.qas = 0;
+					tp->tgoal.offset = 0;
+				} else if (uc->data <= 9 && np->minsync_dt) {
+					if (uc->data < np->minsync_dt)
+						uc->data = np->minsync_dt;
+					tp->tgoal.iu = tp->tgoal.dt =
+						tp->tgoal.qas = 1;
+					tp->tgoal.width = 1;
+					tp->tgoal.period = uc->data;
+					tp->tgoal.offset = np->maxoffs_dt;
+				} else {
+					if (uc->data < np->minsync)
+						uc->data = np->minsync;
+					tp->tgoal.iu = tp->tgoal.dt =
+						tp->tgoal.qas = 0;
+					tp->tgoal.period = uc->data;
+					tp->tgoal.offset = np->maxoffs;
+				}
+				tp->tgoal.check_nego = 1;
+				break;
+			case UC_SETWIDE:
+				tp->tgoal.width = uc->data ? 1 : 0;
+				tp->tgoal.check_nego = 1;
+				break;
+			case UC_SETTAGS:
+				for (l = 0; l < SYM_CONF_MAX_LUN; l++)
+					sym_tune_dev_queuing(tp, l, uc->data);
+				break;
+			case UC_RESETDEV:
+				tp->to_reset = 1;
+				np->istat_sem = SEM;
+				OUTB(np, nc_istat, SIGP|SEM);
+				break;
+			case UC_CLEARDEV:
+				for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
+					struct sym_lcb *lp = sym_lp(tp, l);
+					if (lp) lp->to_clear = 1;
+				}