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ath9k: Add a debugfs file to show interrupt statistics
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Location: ath9k/<phy>/interrupt

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Sujith authored and John W. Linville committed Dec 12, 2008
1 parent 3706de6 commit 817e11d
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Showing 3 changed files with 159 additions and 0 deletions.
55 changes: 55 additions & 0 deletions drivers/net/wireless/ath9k/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -88,16 +88,66 @@ enum ATH_DEBUG {

#ifdef CONFIG_ATH9K_DEBUG

/**
* struct ath_interrupt_stats - Contains statistics about interrupts
* @total: Total no. of interrupts generated so far
* @rxok: RX with no errors
* @rxeol: RX with no more RXDESC available
* @rxorn: RX FIFO overrun
* @txok: TX completed at the requested rate
* @txurn: TX FIFO underrun
* @mib: MIB regs reaching its threshold
* @rxphyerr: RX with phy errors
* @rx_keycache_miss: RX with key cache misses
* @swba: Software Beacon Alert
* @bmiss: Beacon Miss
* @bnr: Beacon Not Ready
* @cst: Carrier Sense TImeout
* @gtt: Global TX Timeout
* @tim: RX beacon TIM occurrence
* @cabend: RX End of CAB traffic
* @dtimsync: DTIM sync lossage
* @dtim: RX Beacon with DTIM
*/
struct ath_interrupt_stats {
u32 total;
u32 rxok;
u32 rxeol;
u32 rxorn;
u32 txok;
u32 txeol;
u32 txurn;
u32 mib;
u32 rxphyerr;
u32 rx_keycache_miss;
u32 swba;
u32 bmiss;
u32 bnr;
u32 cst;
u32 gtt;
u32 tim;
u32 cabend;
u32 dtimsync;
u32 dtim;
};

struct ath_stats {
struct ath_interrupt_stats istats;
};

struct ath9k_debug {
int debug_mask;
struct dentry *debugfs_root;
struct dentry *debugfs_phy;
struct dentry *debugfs_dma;
struct dentry *debugfs_interrupt;
struct ath_stats stats;
};

void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...);
int ath9k_init_debug(struct ath_softc *sc);
void ath9k_exit_debug(struct ath_softc *sc);
void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status);

#else

Expand All @@ -115,6 +165,11 @@ static inline void ath9k_exit_debug(struct ath_softc *sc)
{
}

static inline void ath_debug_stat_interrupt(struct ath_softc *sc,
enum ath9k_int status)
{
}

#endif /* CONFIG_ATH9K_DEBUG */

struct ath_config {
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102 changes: 102 additions & 0 deletions drivers/net/wireless/ath9k/debug.c
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,100 @@ static const struct file_operations fops_dma = {
.owner = THIS_MODULE
};


void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status)
{
if (status)
sc->sc_debug.stats.istats.total++;
if (status & ATH9K_INT_RX)
sc->sc_debug.stats.istats.rxok++;
if (status & ATH9K_INT_RXEOL)
sc->sc_debug.stats.istats.rxeol++;
if (status & ATH9K_INT_RXORN)
sc->sc_debug.stats.istats.rxorn++;
if (status & ATH9K_INT_TX)
sc->sc_debug.stats.istats.txok++;
if (status & ATH9K_INT_TXURN)
sc->sc_debug.stats.istats.txurn++;
if (status & ATH9K_INT_MIB)
sc->sc_debug.stats.istats.mib++;
if (status & ATH9K_INT_RXPHY)
sc->sc_debug.stats.istats.rxphyerr++;
if (status & ATH9K_INT_RXKCM)
sc->sc_debug.stats.istats.rx_keycache_miss++;
if (status & ATH9K_INT_SWBA)
sc->sc_debug.stats.istats.swba++;
if (status & ATH9K_INT_BMISS)
sc->sc_debug.stats.istats.bmiss++;
if (status & ATH9K_INT_BNR)
sc->sc_debug.stats.istats.bnr++;
if (status & ATH9K_INT_CST)
sc->sc_debug.stats.istats.cst++;
if (status & ATH9K_INT_GTT)
sc->sc_debug.stats.istats.gtt++;
if (status & ATH9K_INT_TIM)
sc->sc_debug.stats.istats.tim++;
if (status & ATH9K_INT_CABEND)
sc->sc_debug.stats.istats.cabend++;
if (status & ATH9K_INT_DTIMSYNC)
sc->sc_debug.stats.istats.dtimsync++;
if (status & ATH9K_INT_DTIM)
sc->sc_debug.stats.istats.dtim++;
}

static ssize_t read_file_interrupt(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_softc *sc = file->private_data;
char buf[512];
unsigned int len = 0;

len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "RX", sc->sc_debug.stats.istats.rxok);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "RXEOL", sc->sc_debug.stats.istats.rxeol);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "RXORN", sc->sc_debug.stats.istats.rxorn);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "TX", sc->sc_debug.stats.istats.txok);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "TXURN", sc->sc_debug.stats.istats.txurn);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "MIB", sc->sc_debug.stats.istats.mib);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "RXPHY", sc->sc_debug.stats.istats.rxphyerr);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "RXKCM", sc->sc_debug.stats.istats.rx_keycache_miss);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "SWBA", sc->sc_debug.stats.istats.swba);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "BMISS", sc->sc_debug.stats.istats.bmiss);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "BNR", sc->sc_debug.stats.istats.bnr);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "CST", sc->sc_debug.stats.istats.cst);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "GTT", sc->sc_debug.stats.istats.gtt);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "TIM", sc->sc_debug.stats.istats.tim);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "CABEND", sc->sc_debug.stats.istats.cabend);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "DTIMSYNC", sc->sc_debug.stats.istats.dtimsync);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "DTIM", sc->sc_debug.stats.istats.dtim);
len += snprintf(buf + len, sizeof(buf) - len,
"%8s: %10u\n", "TOTAL", sc->sc_debug.stats.istats.total);

return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}

static const struct file_operations fops_interrupt = {
.read = read_file_interrupt,
.open = ath9k_debugfs_open,
.owner = THIS_MODULE
};

int ath9k_init_debug(struct ath_softc *sc)
{
sc->sc_debug.debug_mask = ath9k_debug;
Expand All @@ -146,6 +240,13 @@ int ath9k_init_debug(struct ath_softc *sc)
if (!sc->sc_debug.debugfs_dma)
goto err;

sc->sc_debug.debugfs_interrupt = debugfs_create_file("interrupt",
S_IRUGO,
sc->sc_debug.debugfs_phy,
sc, &fops_interrupt);
if (!sc->sc_debug.debugfs_interrupt)
goto err;

return 0;
err:
ath9k_exit_debug(sc);
Expand All @@ -154,6 +255,7 @@ int ath9k_init_debug(struct ath_softc *sc)

void ath9k_exit_debug(struct ath_softc *sc)
{
debugfs_remove(sc->sc_debug.debugfs_interrupt);
debugfs_remove(sc->sc_debug.debugfs_dma);
debugfs_remove(sc->sc_debug.debugfs_phy);
debugfs_remove(sc->sc_debug.debugfs_root);
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2 changes: 2 additions & 0 deletions drivers/net/wireless/ath9k/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -598,6 +598,8 @@ static irqreturn_t ath_isr(int irq, void *dev)
}
} while (0);

ath_debug_stat_interrupt(sc, status);

if (sched) {
/* turn off every interrupt except SWBA */
ath9k_hw_set_interrupts(ah, (sc->sc_imask & ATH9K_INT_SWBA));
Expand Down

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