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alistair23-linux/drivers/usb/host/imx21-dbg.c
Greg Kroah-Hartman 465d3256f6 USB: imx21-hcd: no need to check return value of debugfs_create functions 
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Johan Hovold <johan@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-31 12:54:22 +02:00

440 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2009 by Martin Fuzzey
*/
/* this file is part of imx21-hcd.c */
#ifdef CONFIG_DYNAMIC_DEBUG
#define DEBUG
#endif
#ifndef DEBUG
static inline void create_debug_files(struct imx21 *imx21) { }
static inline void remove_debug_files(struct imx21 *imx21) { }
static inline void debug_urb_submitted(struct imx21 *imx21, struct urb *urb) {}
static inline void debug_urb_completed(struct imx21 *imx21, struct urb *urb,
int status) {}
static inline void debug_urb_unlinked(struct imx21 *imx21, struct urb *urb) {}
static inline void debug_urb_queued_for_etd(struct imx21 *imx21,
struct urb *urb) {}
static inline void debug_urb_queued_for_dmem(struct imx21 *imx21,
struct urb *urb) {}
static inline void debug_etd_allocated(struct imx21 *imx21) {}
static inline void debug_etd_freed(struct imx21 *imx21) {}
static inline void debug_dmem_allocated(struct imx21 *imx21, int size) {}
static inline void debug_dmem_freed(struct imx21 *imx21, int size) {}
static inline void debug_isoc_submitted(struct imx21 *imx21,
int frame, struct td *td) {}
static inline void debug_isoc_completed(struct imx21 *imx21,
int frame, struct td *td, int cc, int len) {}
#else
#include <linux/debugfs.h>
#include <linux/seq_file.h>
static const char *dir_labels[] = {
"TD 0",
"OUT",
"IN",
"TD 1"
};
static const char *speed_labels[] = {
"Full",
"Low"
};
static const char *format_labels[] = {
"Control",
"ISO",
"Bulk",
"Interrupt"
};
static inline struct debug_stats *stats_for_urb(struct imx21 *imx21,
struct urb *urb)
{
return usb_pipeisoc(urb->pipe) ?
&imx21->isoc_stats : &imx21->nonisoc_stats;
}
static void debug_urb_submitted(struct imx21 *imx21, struct urb *urb)
{
stats_for_urb(imx21, urb)->submitted++;
}
static void debug_urb_completed(struct imx21 *imx21, struct urb *urb, int st)
{
if (st)
stats_for_urb(imx21, urb)->completed_failed++;
else
stats_for_urb(imx21, urb)->completed_ok++;
}
static void debug_urb_unlinked(struct imx21 *imx21, struct urb *urb)
{
stats_for_urb(imx21, urb)->unlinked++;
}
static void debug_urb_queued_for_etd(struct imx21 *imx21, struct urb *urb)
{
stats_for_urb(imx21, urb)->queue_etd++;
}
static void debug_urb_queued_for_dmem(struct imx21 *imx21, struct urb *urb)
{
stats_for_urb(imx21, urb)->queue_dmem++;
}
static inline void debug_etd_allocated(struct imx21 *imx21)
{
imx21->etd_usage.maximum = max(
++(imx21->etd_usage.value),
imx21->etd_usage.maximum);
}
static inline void debug_etd_freed(struct imx21 *imx21)
{
imx21->etd_usage.value--;
}
static inline void debug_dmem_allocated(struct imx21 *imx21, int size)
{
imx21->dmem_usage.value += size;
imx21->dmem_usage.maximum = max(
imx21->dmem_usage.value,
imx21->dmem_usage.maximum);
}
static inline void debug_dmem_freed(struct imx21 *imx21, int size)
{
imx21->dmem_usage.value -= size;
}
static void debug_isoc_submitted(struct imx21 *imx21,
int frame, struct td *td)
{
struct debug_isoc_trace *trace = &imx21->isoc_trace[
imx21->isoc_trace_index++];
imx21->isoc_trace_index %= ARRAY_SIZE(imx21->isoc_trace);
trace->schedule_frame = td->frame;
trace->submit_frame = frame;
trace->request_len = td->len;
trace->td = td;
}
static inline void debug_isoc_completed(struct imx21 *imx21,
int frame, struct td *td, int cc, int len)
{
struct debug_isoc_trace *trace, *trace_failed;
int i;
int found = 0;
trace = imx21->isoc_trace;
for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace); i++, trace++) {
if (trace->td == td) {
trace->done_frame = frame;
trace->done_len = len;
trace->cc = cc;
trace->td = NULL;
found = 1;
break;
}
}
if (found && cc) {
trace_failed = &imx21->isoc_trace_failed[
imx21->isoc_trace_index_failed++];
imx21->isoc_trace_index_failed %= ARRAY_SIZE(
imx21->isoc_trace_failed);
*trace_failed = *trace;
}
}
static char *format_ep(struct usb_host_endpoint *ep, char *buf, int bufsize)
{
if (ep)
snprintf(buf, bufsize, "ep_%02x (type:%02X kaddr:%p)",
ep->desc.bEndpointAddress,
usb_endpoint_type(&ep->desc),
ep);
else
snprintf(buf, bufsize, "none");
return buf;
}
static char *format_etd_dword0(u32 value, char *buf, int bufsize)
{
snprintf(buf, bufsize,
"addr=%d ep=%d dir=%s speed=%s format=%s halted=%d",
value & 0x7F,
(value >> DW0_ENDPNT) & 0x0F,
dir_labels[(value >> DW0_DIRECT) & 0x03],
speed_labels[(value >> DW0_SPEED) & 0x01],
format_labels[(value >> DW0_FORMAT) & 0x03],
(value >> DW0_HALTED) & 0x01);
return buf;
}
static int debug_status_show(struct seq_file *s, void *v)
{
struct imx21 *imx21 = s->private;
int etds_allocated = 0;
int etds_sw_busy = 0;
int etds_hw_busy = 0;
int dmem_blocks = 0;
int queued_for_etd = 0;
int queued_for_dmem = 0;
unsigned int dmem_bytes = 0;
int i;
struct etd_priv *etd;
u32 etd_enable_mask;
unsigned long flags;
struct imx21_dmem_area *dmem;
struct ep_priv *ep_priv;
spin_lock_irqsave(&imx21->lock, flags);
etd_enable_mask = readl(imx21->regs + USBH_ETDENSET);
for (i = 0, etd = imx21->etd; i < USB_NUM_ETD; i++, etd++) {
if (etd->alloc)
etds_allocated++;
if (etd->urb)
etds_sw_busy++;
if (etd_enable_mask & (1<<i))
etds_hw_busy++;
}
list_for_each_entry(dmem, &imx21->dmem_list, list) {
dmem_bytes += dmem->size;
dmem_blocks++;
}
list_for_each_entry(ep_priv, &imx21->queue_for_etd, queue)
queued_for_etd++;
list_for_each_entry(etd, &imx21->queue_for_dmem, queue)
queued_for_dmem++;
spin_unlock_irqrestore(&imx21->lock, flags);
seq_printf(s,
"Frame: %d\n"
"ETDs allocated: %d/%d (max=%d)\n"
"ETDs in use sw: %d\n"
"ETDs in use hw: %d\n"
"DMEM allocated: %d/%d (max=%d)\n"
"DMEM blocks: %d\n"
"Queued waiting for ETD: %d\n"
"Queued waiting for DMEM: %d\n",
readl(imx21->regs + USBH_FRMNUB) & 0xFFFF,
etds_allocated, USB_NUM_ETD, imx21->etd_usage.maximum,
etds_sw_busy,
etds_hw_busy,
dmem_bytes, DMEM_SIZE, imx21->dmem_usage.maximum,
dmem_blocks,
queued_for_etd,
queued_for_dmem);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debug_status);
static int debug_dmem_show(struct seq_file *s, void *v)
{
struct imx21 *imx21 = s->private;
struct imx21_dmem_area *dmem;
unsigned long flags;
char ep_text[40];
spin_lock_irqsave(&imx21->lock, flags);
list_for_each_entry(dmem, &imx21->dmem_list, list)
seq_printf(s,
"%04X: size=0x%X "
"ep=%s\n",
dmem->offset, dmem->size,
format_ep(dmem->ep, ep_text, sizeof(ep_text)));
spin_unlock_irqrestore(&imx21->lock, flags);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debug_dmem);
static int debug_etd_show(struct seq_file *s, void *v)
{
struct imx21 *imx21 = s->private;
struct etd_priv *etd;
char buf[60];
u32 dword;
int i, j;
unsigned long flags;
spin_lock_irqsave(&imx21->lock, flags);
for (i = 0, etd = imx21->etd; i < USB_NUM_ETD; i++, etd++) {
int state = -1;
struct urb_priv *urb_priv;
if (etd->urb) {
urb_priv = etd->urb->hcpriv;
if (urb_priv)
state = urb_priv->state;
}
seq_printf(s,
"etd_num: %d\n"
"ep: %s\n"
"alloc: %d\n"
"len: %d\n"
"busy sw: %d\n"
"busy hw: %d\n"
"urb state: %d\n"
"current urb: %p\n",
i,
format_ep(etd->ep, buf, sizeof(buf)),
etd->alloc,
etd->len,
etd->urb != NULL,
(readl(imx21->regs + USBH_ETDENSET) & (1 << i)) > 0,
state,
etd->urb);
for (j = 0; j < 4; j++) {
dword = etd_readl(imx21, i, j);
switch (j) {
case 0:
format_etd_dword0(dword, buf, sizeof(buf));
break;
case 2:
snprintf(buf, sizeof(buf),
"cc=0X%02X", dword >> DW2_COMPCODE);
break;
default:
*buf = 0;
break;
}
seq_printf(s,
"dword %d: submitted=%08X cur=%08X [%s]\n",
j,
etd->submitted_dwords[j],
dword,
buf);
}
seq_printf(s, "\n");
}
spin_unlock_irqrestore(&imx21->lock, flags);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debug_etd);
static void debug_statistics_show_one(struct seq_file *s,
const char *name, struct debug_stats *stats)
{
seq_printf(s, "%s:\n"
"submitted URBs: %lu\n"
"completed OK: %lu\n"
"completed failed: %lu\n"
"unlinked: %lu\n"
"queued for ETD: %lu\n"
"queued for DMEM: %lu\n\n",
name,
stats->submitted,
stats->completed_ok,
stats->completed_failed,
stats->unlinked,
stats->queue_etd,
stats->queue_dmem);
}
static int debug_statistics_show(struct seq_file *s, void *v)
{
struct imx21 *imx21 = s->private;
unsigned long flags;
spin_lock_irqsave(&imx21->lock, flags);
debug_statistics_show_one(s, "nonisoc", &imx21->nonisoc_stats);
debug_statistics_show_one(s, "isoc", &imx21->isoc_stats);
seq_printf(s, "unblock kludge triggers: %lu\n", imx21->debug_unblocks);
spin_unlock_irqrestore(&imx21->lock, flags);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debug_statistics);
static void debug_isoc_show_one(struct seq_file *s,
const char *name, int index, struct debug_isoc_trace *trace)
{
seq_printf(s, "%s %d:\n"
"cc=0X%02X\n"
"scheduled frame %d (%d)\n"
"submitted frame %d (%d)\n"
"completed frame %d (%d)\n"
"requested length=%d\n"
"completed length=%d\n\n",
name, index,
trace->cc,
trace->schedule_frame, trace->schedule_frame & 0xFFFF,
trace->submit_frame, trace->submit_frame & 0xFFFF,
trace->done_frame, trace->done_frame & 0xFFFF,
trace->request_len,
trace->done_len);
}
static int debug_isoc_show(struct seq_file *s, void *v)
{
struct imx21 *imx21 = s->private;
struct debug_isoc_trace *trace;
unsigned long flags;
int i;
spin_lock_irqsave(&imx21->lock, flags);
trace = imx21->isoc_trace_failed;
for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace_failed); i++, trace++)
debug_isoc_show_one(s, "isoc failed", i, trace);
trace = imx21->isoc_trace;
for (i = 0; i < ARRAY_SIZE(imx21->isoc_trace); i++, trace++)
debug_isoc_show_one(s, "isoc", i, trace);
spin_unlock_irqrestore(&imx21->lock, flags);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debug_isoc);
static void create_debug_files(struct imx21 *imx21)
{
struct dentry *root;
root = debugfs_create_dir(dev_name(imx21->dev), NULL);
imx21->debug_root = root;
debugfs_create_file("status", S_IRUGO, root, imx21, &debug_status_fops);
debugfs_create_file("dmem", S_IRUGO, root, imx21, &debug_dmem_fops);
debugfs_create_file("etd", S_IRUGO, root, imx21, &debug_etd_fops);
debugfs_create_file("statistics", S_IRUGO, root, imx21,
&debug_statistics_fops);
debugfs_create_file("isoc", S_IRUGO, root, imx21, &debug_isoc_fops);
}
static void remove_debug_files(struct imx21 *imx21)
{
debugfs_remove_recursive(imx21->debug_root);
}
#endif
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