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Merge "usb: dwc3: gadget: Keep track of IRQ timing statistics"

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qctecmdr 2019-10-25 11:33:09 -07:00 • committed by Gerrit - the friendly Code Review server
commit 23db3d58bf
3 changed files with 52 additions and 0 deletions
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15
drivers/usb/dwc3/core.h
View file

@ -946,6 +946,8 @@ struct dwc3_scratchpad_array {
__le64 dma_adr[DWC3_MAX_HIBER_SCRATCHBUFS];
};
#define MAX_INTR_STATS 10
/**
* struct dwc3 - representation of our controller
* @drd_work: workqueue used for role swapping
@ -1074,6 +1076,10 @@ struct dwc3_scratchpad_array {
* @xhci_imod_value: imod value to use with xhci
* @index: dwc3's instance number
* @dwc_ipc_log_ctxt: dwc3 ipc log context
* @irq_cnt: total irq count
* @bh_completion_time: time taken for taklet completion
* @bh_handled_evt_cnt: no. of events handled by tasklet per interrupt
* @bh_dbg_index: index for capturing bh_completion_time and bh_handled_evt_cnt
*/
struct dwc3 {
struct work_struct drd_work;
@ -1268,6 +1274,15 @@ struct dwc3 {
unsigned int index;
void *dwc_ipc_log_ctxt;
struct dwc3_gadget_events dbg_gadget_events;
/* IRQ timing statistics */
unsigned long irq_cnt;
unsigned int bh_completion_time[MAX_INTR_STATS];
unsigned int bh_handled_evt_cnt[MAX_INTR_STATS];
ktime_t irq_start_time[MAX_INTR_STATS];
unsigned int irq_completion_time[MAX_INTR_STATS];
unsigned int irq_event_count[MAX_INTR_STATS];
unsigned int irq_dbg_index;
};
#define INCRX_BURST_MODE 0

18
drivers/usb/dwc3/debugfs.c
View file

@ -1034,6 +1034,24 @@ static int dwc3_gadget_int_events_show(struct seq_file *s, void *unused)
dbg_gadget_events->cmdcmplt);
seq_printf(s, "unknown_event:%u\n", dbg_gadget_events->unknown_event);
seq_printf(s, "\n\t== Last %d interrupts stats ==\t\n", MAX_INTR_STATS);
seq_puts(s, "@ time (us):\t");
for (i = 0; i < MAX_INTR_STATS; i++)
seq_printf(s, "%lld\t", ktime_to_us(dwc->irq_start_time[i]));
seq_puts(s, "\nhard irq time (us):\t");
for (i = 0; i < MAX_INTR_STATS; i++)
seq_printf(s, "%d\t", dwc->irq_completion_time[i]);
seq_puts(s, "\nevents count:\t\t");
for (i = 0; i < MAX_INTR_STATS; i++)
seq_printf(s, "%d\t", dwc->irq_event_count[i]);
seq_puts(s, "\nbh handled count:\t");
for (i = 0; i < MAX_INTR_STATS; i++)
seq_printf(s, "%d\t", dwc->bh_handled_evt_cnt[i]);
seq_puts(s, "\nirq thread time (us):\t");
for (i = 0; i < MAX_INTR_STATS; i++)
seq_printf(s, "%d\t", dwc->bh_completion_time[i]);
seq_putc(s, '\n');
spin_unlock_irqrestore(&dwc->lock, flags);
return 0;
}

19
drivers/usb/dwc3/gadget.c
View file

@ -3205,6 +3205,7 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
left -= 4;
}
dwc->bh_handled_evt_cnt[dwc->irq_dbg_index] += (evt->count / 4);
evt->count = 0;
evt->flags &= ~DWC3_EVENT_PENDING;
ret = IRQ_HANDLED;
@ -3228,11 +3229,19 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
struct dwc3 *dwc = evt->dwc;
unsigned long flags;
irqreturn_t ret = IRQ_NONE;
ktime_t start_time;
start_time = ktime_get();
spin_lock_irqsave(&dwc->lock, flags);
dwc->bh_handled_evt_cnt[dwc->irq_dbg_index] = 0;
ret = dwc3_process_event_buf(evt);
spin_unlock_irqrestore(&dwc->lock, flags);
dwc->bh_completion_time[dwc->irq_dbg_index] =
ktime_to_us(ktime_sub(ktime_get(), start_time));
dwc->irq_dbg_index = (dwc->irq_dbg_index + 1) % MAX_INTR_STATS;
return ret;
}
@ -3242,6 +3251,10 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
u32 amount;
u32 count;
u32 reg;
ktime_t start_time;
start_time = ktime_get();
dwc->irq_cnt++;
if (pm_runtime_suspended(dwc->dev)) {
pm_runtime_get(dwc->dev);
@ -3280,6 +3293,12 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
dwc->irq_start_time[dwc->irq_dbg_index] = start_time;
dwc->irq_completion_time[dwc->irq_dbg_index] =
ktime_us_delta(ktime_get(), start_time);
dwc->irq_event_count[dwc->irq_dbg_index] = count / 4;
dwc->irq_dbg_index = (dwc->irq_dbg_index + 1) % MAX_INTR_STATS;
return IRQ_WAKE_THREAD;
}