sym_glue.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 2,552 行 · 第 1/5 页

 */
static void sym_tune_dev_queuing(struct sym_hcb *np, int target, int lun, u_short reqtags)
{
	struct sym_tcb *tp = &np->target[target];
	struct sym_lcb *lp = sym_lp(np, 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) {
		printf_info("%s:%d:%d: "
		         "tagged command queuing %s, command queue depth %d.\n",
		          sym_name(np), target, lun,
		          lp->s.reqtags ? "enabled" : "disabled",
 		          lp->started_limit);
	}
}

#ifdef	SYM_LINUX_BOOT_COMMAND_LINE_SUPPORT
/*
 *  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;
}
#else
#define device_queue_depth(np, t, l)	(sym_driver_setup.max_tag)
#endif	/* SYM_LINUX_BOOT_COMMAND_LINE_SUPPORT */

/*
 * Linux entry point for device queue sizing.
 */
static int sym53c8xx_slave_configure(struct scsi_device *device)
{
	struct Scsi_Host *host = device->host;
	struct sym_hcb *np;
	struct sym_tcb *tp;
	struct sym_lcb *lp;
	int reqtags, depth_to_use;

	np = ((struct host_data *) host->hostdata)->ncb;
	tp = &np->target[device->id];

	/*
	 *  Get user settings for transfer parameters.
	 */
	tp->inq_byte7_valid = (INQ7_SYNC|INQ7_WIDE16);
	sym_update_trans_settings(np, tp);

	/*
	 *  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(np, device->id, device->lun, reqtags);

	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->tinfo.goal.options = 0;
					tp->tinfo.goal.offset  = 0;
					break;
				}
				if (uc->data <= 9 && np->minsync_dt) {
					if (uc->data < np->minsync_dt)
						uc->data = np->minsync_dt;
					tp->tinfo.goal.options = PPR_OPT_DT;
					tp->tinfo.goal.width   = 1;
					tp->tinfo.goal.period = uc->data;
					tp->tinfo.goal.offset = np->maxoffs_dt;
				} else {
					if (uc->data < np->minsync)
						uc->data = np->minsync;
					tp->tinfo.goal.options = 0;
					tp->tinfo.goal.period = uc->data;
					tp->tinfo.goal.offset = np->maxoffs;
				}
				break;
			case UC_SETWIDE:
				tp->tinfo.goal.width = uc->data ? 1 : 0;
				break;
			case UC_SETTAGS:
				for (l = 0; l < SYM_CONF_MAX_LUN; l++)
					sym_tune_dev_queuing(np, t,l, uc->data);
				break;
			case UC_RESETDEV:
				tp->to_reset = 1;
				np->istat_sem = SEM;
				OUTB (nc_istat, SIGP|SEM);
				break;
			case UC_CLEARDEV:
				for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
					struct sym_lcb *lp = sym_lp(np, tp, l);
					if (lp) lp->to_clear = 1;
				}
				np->istat_sem = SEM;
				OUTB (nc_istat, SIGP|SEM);
				break;
			case UC_SETFLAG:
				tp->usrflags = uc->data;
				break;
			}
		}
		break;
	}
}

#define digit_to_bin(c)	((c) - '0')

static int skip_spaces(char *ptr, int len)
{
	int cnt, c;

	for (cnt = len; cnt > 0 && (c = *ptr++) && isspace(c); cnt--);

	return (len - cnt);
}

static int get_int_arg(char *ptr, int len, u_long *pv)
{
	int	cnt, c;
	u_long	v;

	for (v = 0, cnt = len; cnt > 0 && (c = *ptr++) && isdigit(c); cnt--) {
		v = (v * 10) + digit_to_bin(c);
	}

	if (pv)
		*pv = v;

	return (len - cnt);
}

static int is_keyword(char *ptr, int len, char *verb)
{
	int verb_len = strlen(verb);

	if (len >= verb_len && !memcmp(verb, ptr, verb_len))
		return verb_len;
	else
		return 0;

}

#define SKIP_SPACES(min_spaces)						\
	if ((arg_len = skip_spaces(ptr, len)) < (min_spaces))		\
		return -EINVAL;						\
	ptr += arg_len; len -= arg_len;

#define GET_INT_ARG(v)							\
	if (!(arg_len = get_int_arg(ptr, len, &(v))))			\
		return -EINVAL;						\
	ptr += arg_len; len -= arg_len;


/*
 * Parse a control command
 */

static int sym_user_command(struct sym_hcb *np, char *buffer, int length)
{
	char *ptr	= buffer;
	int len		= length;
	struct sym_usrcmd cmd, *uc = &cmd;
	int		arg_len;
	u_long 		target;

	bzero(uc, sizeof(*uc));

	if (len > 0 && ptr[len-1] == '\n')
		--len;

	if	((arg_len = is_keyword(ptr, len, "setsync")) != 0)
		uc->cmd = UC_SETSYNC;
	else if	((arg_len = is_keyword(ptr, len, "settags")) != 0)
		uc->cmd = UC_SETTAGS;
	else if	((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
		uc->cmd = UC_SETVERBOSE;
	else if	((arg_len = is_keyword(ptr, len, "setwide")) != 0)
		uc->cmd = UC_SETWIDE;
#ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
	else if	((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
		uc->cmd = UC_SETDEBUG;
#endif
	else if	((arg_len = is_keyword(ptr, len, "setflag")) != 0)
		uc->cmd = UC_SETFLAG;
	else if	((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
		uc->cmd = UC_RESETDEV;
	else if	((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
		uc->cmd = UC_CLEARDEV;
	else
		arg_len = 0;

#ifdef DEBUG_PROC_INFO
printk("sym_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
#endif

	if (!arg_len)
		return -EINVAL;
	ptr += arg_len; len -= arg_len;

	switch(uc->cmd) {
	case UC_SETSYNC:
	case UC_SETTAGS:
	case UC_SETWIDE:
	case UC_SETFLAG:
	case UC_RESETDEV:
	case UC_CLEARDEV:
		SKIP_SPACES(1);
		if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
			ptr += arg_len; len -= arg_len;
			uc->target = ~0;
		} else {
			GET_INT_ARG(target);
			uc->target = (1<<target);
#ifdef DEBUG_PROC_INFO
printk("sym_user_command: target=%ld\n", target);
#endif
		}
		break;
	}

	switch(uc->cmd) {
	case UC_SETVERBOSE:
	case UC_SETSYNC:
	case UC_SETTAGS:
	case UC_SETWIDE:
		SKIP_SPACES(1);
		GET_INT_ARG(uc->data);
#ifdef DEBUG_PROC_INFO
printk("sym_user_command: data=%ld\n", uc->data);
#endif
		break;
#ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
	case UC_SETDEBUG:
		while (len > 0) {
			SKIP_SPACES(1);
			if	((arg_len = is_keyword(ptr, len, "alloc")))
				uc->data |= DEBUG_ALLOC;
			else if	((arg_len = is_keyword(ptr, len, "phase")))
				uc->data |= DEBUG_PHASE;
			else if	((arg_len = is_keyword(ptr, len, "queue")))
				uc->data |= DEBUG_QUEUE;
			else if	((arg_len = is_keyword(ptr, len, "result")))
				uc->data |= DEBUG_RESULT;
			else if	((arg_len = is_keyword(ptr, len, "scatter")))
				uc->data |= DEBUG_SCATTER;
			else if	((arg_len = is_keyword(ptr, len, "script")))
				uc->data |= DEBUG_SCRIPT;
			else if	((arg_len = is_keyword(ptr, len, "tiny")))
				uc->data |= DEBUG_TINY;
			else if	((arg_len = is_keyword(ptr, len, "timing")))
				uc->data |= DEBUG_TIMING;
			else if	((arg_len = is_keyword(ptr, len, "nego")))
				uc->data |= DEBUG_NEGO;
			else if	((arg_len = is_keyword(ptr, len, "tags")))
				uc->data |= DEBUG_TAGS;
			else if	((arg_len = is_keyword(ptr, len, "pointer")))
				uc->data |= DEBUG_POINTER;
			else
				return -EINVAL;
			ptr += arg_len; len -= arg_len;
		}
#ifdef DEBUG_PROC_INFO
printk("sym_user_command: data=%ld\n", uc->data);
#endif
		break;
#endif /* SYM_LINUX_DEBUG_CONTROL_SUPPORT */
	case UC_SETFLAG:
		while (len > 0) {
			SKIP_SPACES(1);
			if	((arg_len = is_keyword(ptr, len, "no_disc")))
				uc->data &= ~SYM_DISC_ENABLED;
			else
				return -EINVAL;
			ptr += arg_len; len -= arg_len;
		}
		break;
	default:
		break;
	}

	if (len)
		return -EINVAL;
	else {
		unsigned long flags;

		spin_lock_irqsave(np->s.host->host_lock, flags);
		sym_exec_user_command (np, uc);
		spin_unlock_irqrestore(np->s.host->host_lock, flags);
	}
	return length;
}

#endif	/* SYM_LINUX_USER_COMMAND_SUPPORT */


#ifdef SYM_LINUX_USER_INFO_SUPPORT
/*
 *  Informations through the proc file system.
 */
struct info_str {
	char *buffer;
	int length;
	int offset;
	int pos;
};

static void copy_mem_info(struct info_str *info, char *data, int len)
{
	if (info->pos + len > info->length)
		len = info->length - info->pos;

	if (info->pos + len < info->offset) {
		info->pos += len;
		return;
	}
	if (info->pos < info->offset) {
		data += (info->offset - info->pos);
		len  -= (info->offset - info->pos);
	}

	if (len > 0) {
		memcpy(info->buffer + info->pos, data, len);
		info->pos += len;
	}
}

static int copy_info(struct info_str *info, char *fmt, ...)
{
	va_list args;
	char buf[81];
	int len;

	va_start(args, fmt);
	len = vsprintf(buf, fmt, args);
	va_end(args);

	copy_mem_info(info, buf, len);
	return len;
}

/*
 *  Copy formatted information into the input buffer.
 */
static int sym_host_info(struct sym_hcb *np, char *ptr, off_t offset, int len)
{
	struct info_str info;

	info.buffer	= ptr;
	info.length	= len;
	info.offset	= offset;
	info.pos	= 0;