ehci-dbg.c 28.8 KB
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/*
 * Copyright (c) 2001-2002 by David Brownell
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 *
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 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

#define ehci_dbg(ehci, fmt, args...) \
	dev_dbg (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_err(ehci, fmt, args...) \
	dev_err (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_info(ehci, fmt, args...) \
	dev_info (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_warn(ehci, fmt, args...) \
	dev_warn (ehci_to_hcd(ehci)->self.controller , fmt , ## args )

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#ifdef VERBOSE_DEBUG
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#	define ehci_vdbg ehci_dbg
#else
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	static inline void ehci_vdbg(struct ehci_hcd *ehci, ...) {}
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#endif

#ifdef	DEBUG

/* check the values in the HCSPARAMS register
 * (host controller _Structural_ parameters)
 * see EHCI spec, Table 2-4 for each value
 */
static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
{
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	u32	params = ehci_readl(ehci, &ehci->caps->hcs_params);
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	ehci_dbg (ehci,
		"%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
		label, params,
		HCS_DEBUG_PORT (params),
		HCS_INDICATOR (params) ? " ind" : "",
		HCS_N_CC (params),
		HCS_N_PCC (params),
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		HCS_PORTROUTED (params) ? "" : " ordered",
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		HCS_PPC (params) ? "" : " !ppc",
		HCS_N_PORTS (params)
		);
	/* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
	if (HCS_PORTROUTED (params)) {
		int i;
		char buf [46], tmp [7], byte;

		buf[0] = 0;
		for (i = 0; i < HCS_N_PORTS (params); i++) {
			// FIXME MIPS won't readb() ...
			byte = readb (&ehci->caps->portroute[(i>>1)]);
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			sprintf(tmp, "%d ",
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				((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
			strcat(buf, tmp);
		}
		ehci_dbg (ehci, "%s portroute %s\n",
				label, buf);
	}
}
#else

static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

/* check the values in the HCCPARAMS register
 * (host controller _Capability_ parameters)
 * see EHCI Spec, Table 2-5 for each value
 * */
static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
{
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	u32	params = ehci_readl(ehci, &ehci->caps->hcc_params);
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	if (HCC_ISOC_CACHE (params)) {
		ehci_dbg (ehci,
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			"%s hcc_params %04x caching frame %s%s%s\n",
			label, params,
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
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	} else {
		ehci_dbg (ehci,
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			"%s hcc_params %04x thresh %d uframes %s%s%s%s%s%s%s\n",
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			label,
			params,
			HCC_ISOC_THRES(params),
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
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			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "",
			HCC_LPM(params) ? " LPM" : "",
			HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
			HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
			HCC_32FRAME_PERIODIC_LIST(params) ?
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				" 32 periodic list" : "");
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	}
}
#else

static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

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static void __maybe_unused
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dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
{
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	ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
		hc32_to_cpup(ehci, &qtd->hw_next),
		hc32_to_cpup(ehci, &qtd->hw_alt_next),
		hc32_to_cpup(ehci, &qtd->hw_token),
		hc32_to_cpup(ehci, &qtd->hw_buf [0]));
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	if (qtd->hw_buf [1])
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		ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
			hc32_to_cpup(ehci, &qtd->hw_buf[1]),
			hc32_to_cpup(ehci, &qtd->hw_buf[2]),
			hc32_to_cpup(ehci, &qtd->hw_buf[3]),
			hc32_to_cpup(ehci, &qtd->hw_buf[4]));
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}

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static void __maybe_unused
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dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{
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	struct ehci_qh_hw *hw = qh->hw;

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	ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
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		qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
	dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
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}

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static void __maybe_unused
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dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
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{
	ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
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		label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
		itd->urb);
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	ehci_dbg (ehci,
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		"  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
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		hc32_to_cpu(ehci, itd->hw_transaction[0]),
		hc32_to_cpu(ehci, itd->hw_transaction[1]),
		hc32_to_cpu(ehci, itd->hw_transaction[2]),
		hc32_to_cpu(ehci, itd->hw_transaction[3]),
		hc32_to_cpu(ehci, itd->hw_transaction[4]),
		hc32_to_cpu(ehci, itd->hw_transaction[5]),
		hc32_to_cpu(ehci, itd->hw_transaction[6]),
		hc32_to_cpu(ehci, itd->hw_transaction[7]));
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	ehci_dbg (ehci,
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		"  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
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		hc32_to_cpu(ehci, itd->hw_bufp[0]),
		hc32_to_cpu(ehci, itd->hw_bufp[1]),
		hc32_to_cpu(ehci, itd->hw_bufp[2]),
		hc32_to_cpu(ehci, itd->hw_bufp[3]),
		hc32_to_cpu(ehci, itd->hw_bufp[4]),
		hc32_to_cpu(ehci, itd->hw_bufp[5]),
		hc32_to_cpu(ehci, itd->hw_bufp[6]));
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	ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
		itd->index[0], itd->index[1], itd->index[2],
		itd->index[3], itd->index[4], itd->index[5],
		itd->index[6], itd->index[7]);
}

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static void __maybe_unused
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dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
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{
	ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
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		label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
		sitd->urb);
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	ehci_dbg (ehci,
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		"  addr %08x sched %04x result %08x buf %08x %08x\n",
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		hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
		hc32_to_cpu(ehci, sitd->hw_uframe),
		hc32_to_cpu(ehci, sitd->hw_results),
		hc32_to_cpu(ehci, sitd->hw_buf[0]),
		hc32_to_cpu(ehci, sitd->hw_buf[1]));
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}

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static int __maybe_unused
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dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{
	return scnprintf (buf, len,
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		"%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", status,
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		(status & STS_PPCE_MASK) ? " PPCE" : "",
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		(status & STS_ASS) ? " Async" : "",
		(status & STS_PSS) ? " Periodic" : "",
		(status & STS_RECL) ? " Recl" : "",
		(status & STS_HALT) ? " Halt" : "",
		(status & STS_IAA) ? " IAA" : "",
		(status & STS_FATAL) ? " FATAL" : "",
		(status & STS_FLR) ? " FLR" : "",
		(status & STS_PCD) ? " PCD" : "",
		(status & STS_ERR) ? " ERR" : "",
		(status & STS_INT) ? " INT" : ""
		);
}

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static int __maybe_unused
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dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{
	return scnprintf (buf, len,
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		"%s%sintrenable %02x%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", enable,
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		(enable & STS_PPCE_MASK) ? " PPCE" : "",
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		(enable & STS_IAA) ? " IAA" : "",
		(enable & STS_FATAL) ? " FATAL" : "",
		(enable & STS_FLR) ? " FLR" : "",
		(enable & STS_PCD) ? " PCD" : "",
		(enable & STS_ERR) ? " ERR" : "",
		(enable & STS_INT) ? " INT" : ""
		);
}

static const char *const fls_strings [] =
    { "1024", "512", "256", "??" };

static int
dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{
	return scnprintf (buf, len,
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		"%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
		"period=%s%s %s",
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		label, label [0] ? " " : "", command,
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		(command & CMD_HIRD) ? " HIRD" : "",
		(command & CMD_PPCEE) ? " PPCEE" : "",
		(command & CMD_FSP) ? " FSP" : "",
		(command & CMD_ASPE) ? " ASPE" : "",
		(command & CMD_PSPE) ? " PSPE" : "",
		(command & CMD_PARK) ? " park" : "(park)",
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		CMD_PARK_CNT (command),
		(command >> 16) & 0x3f,
		(command & CMD_LRESET) ? " LReset" : "",
		(command & CMD_IAAD) ? " IAAD" : "",
		(command & CMD_ASE) ? " Async" : "",
		(command & CMD_PSE) ? " Periodic" : "",
		fls_strings [(command >> 2) & 0x3],
		(command & CMD_RESET) ? " Reset" : "",
		(command & CMD_RUN) ? "RUN" : "HALT"
		);
}

static int
dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{
	char	*sig;

	/* signaling state */
	switch (status & (3 << 10)) {
	case 0 << 10: sig = "se0"; break;
	case 1 << 10: sig = "k"; break;		/* low speed */
	case 2 << 10: sig = "j"; break;
	default: sig = "?"; break;
	}

	return scnprintf (buf, len,
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		"%s%sport:%d status %06x %d %s%s%s%s%s%s "
		"sig=%s%s%s%s%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", port, status,
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		status>>25,/*device address */
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ACK ?
						" ACK" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_NYET ?
						" NYET" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_STALL ?
						" STALL" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ERR ?
						" ERR" : "",
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		(status & PORT_POWER) ? " POWER" : "",
		(status & PORT_OWNER) ? " OWNER" : "",
		sig,
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		(status & PORT_LPM) ? " LPM" : "",
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		(status & PORT_RESET) ? " RESET" : "",
		(status & PORT_SUSPEND) ? " SUSPEND" : "",
		(status & PORT_RESUME) ? " RESUME" : "",
		(status & PORT_OCC) ? " OCC" : "",
		(status & PORT_OC) ? " OC" : "",
		(status & PORT_PEC) ? " PEC" : "",
		(status & PORT_PE) ? " PE" : "",
		(status & PORT_CSC) ? " CSC" : "",
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		(status & PORT_CONNECT) ? " CONNECT" : "");
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}

#else
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static inline void __maybe_unused
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dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{}

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static inline int __maybe_unused
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dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{ return 0; }

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static inline int __maybe_unused
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dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{ return 0; }

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static inline int __maybe_unused
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dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{ return 0; }

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static inline int __maybe_unused
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dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{ return 0; }

#endif	/* DEBUG */

/* functions have the "wrong" filename when they're output... */
#define dbg_status(ehci, label, status) { \
	char _buf [80]; \
	dbg_status_buf (_buf, sizeof _buf, label, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_cmd(ehci, label, command) { \
	char _buf [80]; \
	dbg_command_buf (_buf, sizeof _buf, label, command); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_port(ehci, label, port, status) { \
	char _buf [80]; \
	dbg_port_buf (_buf, sizeof _buf, label, port, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

/*-------------------------------------------------------------------------*/

#ifdef STUB_DEBUG_FILES

static inline void create_debug_files (struct ehci_hcd *bus) { }
static inline void remove_debug_files (struct ehci_hcd *bus) { }

#else

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/* troubleshooting help: expose state in debugfs */

static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);
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static int debug_lpm_open(struct inode *, struct file *);
static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos);
static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
			      size_t count, loff_t *ppos);
static int debug_lpm_close(struct inode *inode, struct file *file);

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static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);

static const struct file_operations debug_async_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_async_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
static const struct file_operations debug_periodic_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_periodic_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
static const struct file_operations debug_registers_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_registers_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
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static const struct file_operations debug_lpm_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_lpm_open,
	.read		= debug_lpm_read,
	.write		= debug_lpm_write,
	.release	= debug_lpm_close,
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	.llseek		= noop_llseek,
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};
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static struct dentry *ehci_debug_root;

struct debug_buffer {
	ssize_t (*fill_func)(struct debug_buffer *);	/* fill method */
	struct usb_bus *bus;
	struct mutex mutex;	/* protect filling of buffer */
	size_t count;		/* number of characters filled into buffer */
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	char *output_buf;
	size_t alloc_size;
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};
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#define speed_char(info1) ({ char tmp; \
		switch (info1 & (3 << 12)) { \
		case 0 << 12: tmp = 'f'; break; \
		case 1 << 12: tmp = 'l'; break; \
		case 2 << 12: tmp = 'h'; break; \
		default: tmp = '?'; break; \
		}; tmp; })

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static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
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{
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	__u32 v = hc32_to_cpu(ehci, token);

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	if (v & QTD_STS_ACTIVE)
		return '*';
	if (v & QTD_STS_HALT)
		return '-';
	if (!IS_SHORT_READ (v))
		return ' ';
	/* tries to advance through hw_alt_next */
	return '/';
}

static void qh_lines (
	struct ehci_hcd *ehci,
	struct ehci_qh *qh,
	char **nextp,
	unsigned *sizep
)
{
	u32			scratch;
	u32			hw_curr;
	struct list_head	*entry;
	struct ehci_qtd		*td;
	unsigned		temp;
	unsigned		size = *sizep;
	char			*next = *nextp;
	char			mark;
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	__le32			list_end = EHCI_LIST_END(ehci);
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	struct ehci_qh_hw	*hw = qh->hw;
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	if (hw->hw_qtd_next == list_end)	/* NEC does this */
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		mark = '@';
	else
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		mark = token_mark(ehci, hw->hw_token);
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	if (mark == '/') {	/* qh_alt_next controls qh advance? */
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		if ((hw->hw_alt_next & QTD_MASK(ehci))
				== ehci->async->hw->hw_alt_next)
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			mark = '#';	/* blocked */
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		else if (hw->hw_alt_next == list_end)
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			mark = '.';	/* use hw_qtd_next */
		/* else alt_next points to some other qtd */
	}
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	scratch = hc32_to_cpup(ehci, &hw->hw_info1);
	hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
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	temp = scnprintf (next, size,
			"qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
			qh, scratch & 0x007f,
			speed_char (scratch),
			(scratch >> 8) & 0x000f,
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			scratch, hc32_to_cpup(ehci, &hw->hw_info2),
			hc32_to_cpup(ehci, &hw->hw_token), mark,
			(cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
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				? "data1" : "data0",
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			(hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
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	size -= temp;
	next += temp;

	/* hc may be modifying the list as we read it ... */
	list_for_each (entry, &qh->qtd_list) {
		td = list_entry (entry, struct ehci_qtd, qtd_list);
476
		scratch = hc32_to_cpup(ehci, &td->hw_token);
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		mark = ' ';
		if (hw_curr == td->qtd_dma)
			mark = '*';
480
		else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
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			mark = '+';
		else if (QTD_LENGTH (scratch)) {
483
			if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
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				mark = '#';
485
			else if (td->hw_alt_next != list_end)
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				mark = '/';
		}
		temp = snprintf (next, size,
				"\n\t%p%c%s len=%d %08x urb %p",
				td, mark, ({ char *tmp;
				 switch ((scratch>>8)&0x03) {
				 case 0: tmp = "out"; break;
				 case 1: tmp = "in"; break;
				 case 2: tmp = "setup"; break;
				 default: tmp = "?"; break;
				 } tmp;}),
				(scratch >> 16) & 0x7fff,
				scratch,
				td->urb);
500
		if (size < temp)
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			temp = size;
		size -= temp;
		next += temp;
		if (temp == size)
			goto done;
	}

	temp = snprintf (next, size, "\n");
509
	if (size < temp)
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		temp = size;
	size -= temp;
	next += temp;

done:
	*sizep = size;
	*nextp = next;
}

519
static ssize_t fill_async_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size;
	char			*next;
	struct ehci_qh		*qh;

528
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
530 531
	next = buf->output_buf;
	size = buf->alloc_size;
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533 534
	*next = 0;

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	/* dumps a snapshot of the async schedule.
	 * usually empty except for long-term bulk reads, or head.
	 * one QH per line, and TDs we know about
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
		qh_lines (ehci, qh, &next, &size);
	if (ehci->reclaim && size > 0) {
		temp = scnprintf (next, size, "\nreclaim =\n");
		size -= temp;
		next += temp;

		for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
			qh_lines (ehci, qh, &next, &size);
	}
	spin_unlock_irqrestore (&ehci->lock, flags);

552
	return strlen(buf->output_buf);
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}

#define DBG_SCHED_LIMIT 64
556
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	union ehci_shadow	p, *seen;
	unsigned		temp, size, seen_count;
	char			*next;
	unsigned		i;
565
	__hc32			tag;
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567
	if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
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		return 0;
	seen_count = 0;

571
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
573 574
	next = buf->output_buf;
	size = buf->alloc_size;
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	temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
	size -= temp;
	next += temp;

	/* dump a snapshot of the periodic schedule.
	 * iso changes, interrupt usually doesn't.
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (i = 0; i < ehci->periodic_size; i++) {
		p = ehci->pshadow [i];
		if (likely (!p.ptr))
			continue;
588
		tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]);
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		temp = scnprintf (next, size, "%4d: ", i);
		size -= temp;
		next += temp;

		do {
595 596
			struct ehci_qh_hw *hw;

597
			switch (hc32_to_cpu(ehci, tag)) {
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			case Q_TYPE_QH:
599
				hw = p.qh->hw;
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				temp = scnprintf (next, size, " qh%d-%04x/%p",
						p.qh->period,
602
						hc32_to_cpup(ehci,
603
							&hw->hw_info2)
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							/* uframe masks */
605
							& (QH_CMASK | QH_SMASK),
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						p.qh);
				size -= temp;
				next += temp;
				/* don't repeat what follows this qh */
				for (temp = 0; temp < seen_count; temp++) {
					if (seen [temp].ptr != p.ptr)
						continue;
613
					if (p.qh->qh_next.ptr) {
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						temp = scnprintf (next, size,
							" ...");
616 617 618
						size -= temp;
						next += temp;
					}
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					break;
				}
				/* show more info the first time around */
622
				if (temp == seen_count) {
623
					u32	scratch = hc32_to_cpup(ehci,
624
							&hw->hw_info1);
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					struct ehci_qtd	*qtd;
					char		*type = "";

					/* count tds, get ep direction */
					temp = 0;
					list_for_each_entry (qtd,
							&p.qh->qtd_list,
							qtd_list) {
						temp++;
634 635
						switch (0x03 & (hc32_to_cpu(
							ehci,
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							qtd->hw_token) >> 8)) {
						case 0: type = "out"; continue;
						case 1: type = "in"; continue;
						}
					}

					temp = scnprintf (next, size,
						" (%c%d ep%d%s "
						"[%d/%d] q%d p%d)",
						speed_char (scratch),
						scratch & 0x007f,
						(scratch >> 8) & 0x000f, type,
						p.qh->usecs, p.qh->c_usecs,
						temp,
						0x7ff & (scratch >> 16));

					if (seen_count < DBG_SCHED_LIMIT)
						seen [seen_count++].qh = p.qh;
				} else
					temp = 0;
				if (p.qh) {
657
					tag = Q_NEXT_TYPE(ehci, hw->hw_next);
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					p = p.qh->qh_next;
				}
				break;
			case Q_TYPE_FSTN:
				temp = scnprintf (next, size,
					" fstn-%8x/%p", p.fstn->hw_prev,
					p.fstn);
665
				tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
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				p = p.fstn->fstn_next;
				break;
			case Q_TYPE_ITD:
				temp = scnprintf (next, size,
					" itd/%p", p.itd);
671
				tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
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				p = p.itd->itd_next;
				break;
			case Q_TYPE_SITD:
				temp = scnprintf (next, size,
					" sitd%d-%04x/%p",
					p.sitd->stream->interval,
678
					hc32_to_cpup(ehci, &p.sitd->hw_uframe)
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						& 0x0000ffff,
					p.sitd);
681
				tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
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				p = p.sitd->sitd_next;
				break;
			}
			size -= temp;
			next += temp;
		} while (p.ptr);

		temp = scnprintf (next, size, "\n");
		size -= temp;
		next += temp;
	}
	spin_unlock_irqrestore (&ehci->lock, flags);
	kfree (seen);

696
	return buf->alloc_size - size;
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}
#undef DBG_SCHED_LIMIT

700 701 702 703 704 705 706 707 708 709 710 711 712
static const char *rh_state_string(struct ehci_hcd *ehci)
{
	switch (ehci->rh_state) {
	case EHCI_RH_HALTED:
		return "halted";
	case EHCI_RH_SUSPENDED:
		return "suspended";
	case EHCI_RH_RUNNING:
		return "running";
	}
	return "?";
}

713
static ssize_t fill_registers_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size, i;
	char			*next, scratch [80];
	static char		fmt [] = "%*s\n";
	static char		label [] = "";

723
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
725 726
	next = buf->output_buf;
	size = buf->alloc_size;
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	spin_lock_irqsave (&ehci->lock, flags);

730
	if (!HCD_HW_ACCESSIBLE(hcd)) {
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		size = scnprintf (next, size,
732
			"bus %s, device %s\n"
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			"%s\n"
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			"SUSPENDED (no register access)\n",
			hcd->self.controller->bus->name,
736
			dev_name(hcd->self.controller),
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			hcd->product_desc);
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		goto done;
	}

	/* Capability Registers */
742
	i = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
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	temp = scnprintf (next, size,
744
		"bus %s, device %s\n"
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		"%s\n"
746
		"EHCI %x.%02x, rh state %s\n",
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		hcd->self.controller->bus->name,
748
		dev_name(hcd->self.controller),
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		hcd->product_desc,
750
		i >> 8, i & 0x0ff, rh_state_string(ehci));
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	size -= temp;
	next += temp;

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#ifdef	CONFIG_PCI
	/* EHCI 0.96 and later may have "extended capabilities" */
	if (hcd->self.controller->bus == &pci_bus_type) {
		struct pci_dev	*pdev;
		u32		offset, cap, cap2;
		unsigned	count = 256/4;

		pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
762 763
		offset = HCC_EXT_CAPS(ehci_readl(ehci,
				&ehci->caps->hcc_params));
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		while (offset && count--) {
			pci_read_config_dword (pdev, offset, &cap);
			switch (cap & 0xff) {
			case 1:
				temp = scnprintf (next, size,
					"ownership %08x%s%s\n", cap,
					(cap & (1 << 24)) ? " linux" : "",
					(cap & (1 << 16)) ? " firmware" : "");
				size -= temp;
				next += temp;

				offset += 4;
				pci_read_config_dword (pdev, offset, &cap2);
				temp = scnprintf (next, size,
					"SMI sts/enable 0x%08x\n", cap2);
				size -= temp;
				next += temp;
				break;
			case 0:		/* illegal reserved capability */
				cap = 0;
				/* FALLTHROUGH */
			default:		/* unknown */
				break;
			}
			temp = (cap >> 8) & 0xff;
		}
	}
#endif

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	// FIXME interpret both types of params
794
	i = ehci_readl(ehci, &ehci->caps->hcs_params);
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	temp = scnprintf (next, size, "structural params 0x%08x\n", i);
	size -= temp;
	next += temp;

799
	i = ehci_readl(ehci, &ehci->caps->hcc_params);
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	temp = scnprintf (next, size, "capability params 0x%08x\n", i);
	size -= temp;
	next += temp;

	/* Operational Registers */
	temp = dbg_status_buf (scratch, sizeof scratch, label,
806
			ehci_readl(ehci, &ehci->regs->status));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_command_buf (scratch, sizeof scratch, label,
812
			ehci_readl(ehci, &ehci->regs->command));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_intr_buf (scratch, sizeof scratch, label,
818
			ehci_readl(ehci, &ehci->regs->intr_enable));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "uframe %04x\n",
824
			ehci_read_frame_index(ehci));
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	size -= temp;
	next += temp;

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	for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
		temp = dbg_port_buf (scratch, sizeof scratch, label, i,
830 831
				ehci_readl(ehci,
					&ehci->regs->port_status[i - 1]));
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		temp = scnprintf (next, size, fmt, temp, scratch);
		size -= temp;
		next += temp;
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		if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
			temp = scnprintf (next, size,
					"    debug control %08x\n",
838 839
					ehci_readl(ehci,
						&ehci->debug->control));
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			size -= temp;
			next += temp;
		}
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	}

	if (ehci->reclaim) {
846
		temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
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		size -= temp;
		next += temp;
	}

#ifdef EHCI_STATS
	temp = scnprintf (next, size,
		"irq normal %ld err %ld reclaim %ld (lost %ld)\n",
		ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
		ehci->stats.lost_iaa);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "complete %ld unlink %ld\n",
		ehci->stats.complete, ehci->stats.unlink);
	size -= temp;
	next += temp;
#endif

done:
	spin_unlock_irqrestore (&ehci->lock, flags);

868
	return buf->alloc_size - size;
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}

871 872
static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
				ssize_t (*fill_func)(struct debug_buffer *))
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{
874 875 876
	struct debug_buffer *buf;

	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
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878 879 880 881
	if (buf) {
		buf->bus = bus;
		buf->fill_func = fill_func;
		mutex_init(&buf->mutex);
882
		buf->alloc_size = PAGE_SIZE;
883 884 885
	}

	return buf;
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}

888
static int fill_buffer(struct debug_buffer *buf)
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{
890 891
	int ret = 0;

892
	if (!buf->output_buf)
893
		buf->output_buf = vmalloc(buf->alloc_size);
894

895
	if (!buf->output_buf) {
896 897 898 899 900
		ret = -ENOMEM;
		goto out;
	}

	ret = buf->fill_func(buf);
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902 903 904 905 906 907 908
	if (ret >= 0) {
		buf->count = ret;
		ret = 0;
	}

out:
	return ret;
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}

911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927
static ssize_t debug_output(struct file *file, char __user *user_buf,
			    size_t len, loff_t *offset)
{
	struct debug_buffer *buf = file->private_data;
	int ret = 0;

	mutex_lock(&buf->mutex);
	if (buf->count == 0) {
		ret = fill_buffer(buf);
		if (ret != 0) {
			mutex_unlock(&buf->mutex);
			goto out;
		}
	}
	mutex_unlock(&buf->mutex);

	ret = simple_read_from_buffer(user_buf, len, offset,
928
				      buf->output_buf, buf->count);
929 930 931 932 933 934 935 936 937

out:
	return ret;

}

static int debug_close(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf = file->private_data;
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939
	if (buf) {
940
		vfree(buf->output_buf);
941 942 943 944 945 946 947 948 949 950 951 952 953 954
		kfree(buf);
	}

	return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static int debug_periodic_open(struct inode *inode, struct file *file)
{
955 956 957 958
	struct debug_buffer *buf;
	buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
	if (!buf)
		return -ENOMEM;
959

960 961 962
	buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
	file->private_data = buf;
	return 0;
963 964 965 966 967 968 969 970 971 972
}

static int debug_registers_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private,
					  fill_registers_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
static int debug_lpm_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static int debug_lpm_close(struct inode *inode, struct file *file)
{
	return 0;
}

static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos)
{
	/* TODO: show lpm stats */
	return 0;
}

static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	char buf[50];
	size_t len;
	u32 temp;
	unsigned long port;
	u32 __iomem	*portsc ;
	u32 params;

	hcd = bus_to_hcd(file->private_data);
	ehci = hcd_to_ehci(hcd);

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;
	buf[len] = '\0';
	if (len > 0 && buf[len - 1] == '\n')
		buf[len - 1] = '\0';

	if (strncmp(buf, "enable", 5) == 0) {
		if (strict_strtoul(buf + 7, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "LPM: no device attached\n");
			return -ENODEV;
		}
		temp |= PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "force enable LPM for port %lu\n", port);
	} else if (strncmp(buf, "hird=", 5) == 0) {
		unsigned long hird;
		if (strict_strtoul(buf + 5, 16, &hird))
			return -EINVAL;
		printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
		temp = ehci_readl(ehci, &ehci->regs->command);
		temp &= ~CMD_HIRD;
		temp |= hird << 24;
		ehci_writel(ehci, temp, &ehci->regs->command);
	} else if (strncmp(buf, "disable", 7) == 0) {
		if (strict_strtoul(buf + 8, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "ERR: no device attached\n");
			return -ENODEV;
		}
		temp &= ~PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "disabled LPM for port %lu\n", port);
	} else
		return -EOPNOTSUPP;
	return count;
}

1061 1062 1063 1064 1065 1066
static inline void create_debug_files (struct ehci_hcd *ehci)
{
	struct usb_bus *bus = &ehci_to_hcd(ehci)->self;

	ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
	if (!ehci->debug_dir)
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
		return;

	if (!debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
						&debug_async_fops))
		goto file_error;

	if (!debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
						&debug_periodic_fops))
		goto file_error;

	if (!debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
						    &debug_registers_fops))
		goto file_error;

1081
	if (!debugfs_create_file("lpm", S_IRUGO|S_IWUSR, ehci->debug_dir, bus,
1082 1083 1084
						    &debug_lpm_fops))
		goto file_error;

1085 1086
	return;

1087 1088
file_error:
	debugfs_remove_recursive(ehci->debug_dir);
1089 1090 1091 1092
}

static inline void remove_debug_files (struct ehci_hcd *ehci)
{
1093
	debugfs_remove_recursive(ehci->debug_dir);
1094 1095 1096
}

#endif /* STUB_DEBUG_FILES */