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ath9k: Add a debugfs file for dumping DMA status
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Debugfs file location: ath9k/<wiphy>/dma
Contains values in DMA debug registers.

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 5, 2008
1 parent 826d268 commit 2a163c6
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Showing 6 changed files with 102 additions and 74 deletions.
1 change: 0 additions & 1 deletion drivers/net/wireless/ath9k/ath9k.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1009,7 +1009,6 @@ enum ath9k_int ath9k_hw_set_interrupts(struct ath_hal *ah, enum ath9k_int ints);

/* MAC (PCU/QCU) */

void ath9k_hw_dmaRegDump(struct ath_hal *ah);
u32 ath9k_hw_gettxbuf(struct ath_hal *ah, u32 q);
bool ath9k_hw_puttxbuf(struct ath_hal *ah, u32 q, u32 txdp);
bool ath9k_hw_txstart(struct ath_hal *ah, u32 q);
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1 change: 0 additions & 1 deletion drivers/net/wireless/ath9k/beacon.c
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Expand Up @@ -492,7 +492,6 @@ void ath9k_beacon_tasklet(unsigned long data)
DPRINTF(sc, ATH_DBG_BEACON,
"beacon is officially "
"stuck\n");
ath9k_hw_dmaRegDump(ah);
}
} else {
DPRINTF(sc, ATH_DBG_BEACON,
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1 change: 1 addition & 0 deletions drivers/net/wireless/ath9k/core.h
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Expand Up @@ -92,6 +92,7 @@ struct ath9k_debug {
int debug_mask;
struct dentry *debugfs_root;
struct dentry *debugfs_phy;
struct dentry *debugfs_dma;
};

void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...);
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100 changes: 100 additions & 0 deletions drivers/net/wireless/ath9k/debug.c
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Expand Up @@ -15,6 +15,8 @@
*/

#include "core.h"
#include "reg.h"
#include "hw.h"

static unsigned int ath9k_debug = DBG_DEFAULT;
module_param_named(debug, ath9k_debug, uint, 0);
Expand All @@ -34,6 +36,98 @@ void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...)
}
}

static int ath9k_debugfs_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}

static ssize_t read_file_dma(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_softc *sc = file->private_data;
struct ath_hal *ah = sc->sc_ah;
char buf[1024];
unsigned int len = 0;
u32 val[ATH9K_NUM_DMA_DEBUG_REGS];
int i, qcuOffset = 0, dcuOffset = 0;
u32 *qcuBase = &val[0], *dcuBase = &val[4];

REG_WRITE(ah, AR_MACMISC,
((AR_MACMISC_DMA_OBS_LINE_8 << AR_MACMISC_DMA_OBS_S) |
(AR_MACMISC_MISC_OBS_BUS_1 <<
AR_MACMISC_MISC_OBS_BUS_MSB_S)));

len += snprintf(buf + len, sizeof(buf) - len,
"Raw DMA Debug values:\n");

for (i = 0; i < ATH9K_NUM_DMA_DEBUG_REGS; i++) {
if (i % 4 == 0)
len += snprintf(buf + len, sizeof(buf) - len, "\n");

val[i] = REG_READ(ah, AR_DMADBG_0 + (i * sizeof(u32)));
len += snprintf(buf + len, sizeof(buf) - len, "%d: %08x ",
i, val[i]);
}

len += snprintf(buf + len, sizeof(buf) - len, "\n\n");
len += snprintf(buf + len, sizeof(buf) - len,
"Num QCU: chain_st fsp_ok fsp_st DCU: chain_st\n");

for (i = 0; i < ATH9K_NUM_QUEUES; i++, qcuOffset += 4, dcuOffset += 5) {
if (i == 8) {
qcuOffset = 0;
qcuBase++;
}

if (i == 6) {
dcuOffset = 0;
dcuBase++;
}

len += snprintf(buf + len, sizeof(buf) - len,
"%2d %2x %1x %2x %2x\n",
i, (*qcuBase & (0x7 << qcuOffset)) >> qcuOffset,
(*qcuBase & (0x8 << qcuOffset)) >> (qcuOffset + 3),
val[2] & (0x7 << (i * 3)) >> (i * 3),
(*dcuBase & (0x1f << dcuOffset)) >> dcuOffset);
}

len += snprintf(buf + len, sizeof(buf) - len, "\n");

len += snprintf(buf + len, sizeof(buf) - len,
"qcu_stitch state: %2x qcu_fetch state: %2x\n",
(val[3] & 0x003c0000) >> 18, (val[3] & 0x03c00000) >> 22);
len += snprintf(buf + len, sizeof(buf) - len,
"qcu_complete state: %2x dcu_complete state: %2x\n",
(val[3] & 0x1c000000) >> 26, (val[6] & 0x3));
len += snprintf(buf + len, sizeof(buf) - len,
"dcu_arb state: %2x dcu_fp state: %2x\n",
(val[5] & 0x06000000) >> 25, (val[5] & 0x38000000) >> 27);
len += snprintf(buf + len, sizeof(buf) - len,
"chan_idle_dur: %3d chan_idle_dur_valid: %1d\n",
(val[6] & 0x000003fc) >> 2, (val[6] & 0x00000400) >> 10);
len += snprintf(buf + len, sizeof(buf) - len,
"txfifo_valid_0: %1d txfifo_valid_1: %1d\n",
(val[6] & 0x00000800) >> 11, (val[6] & 0x00001000) >> 12);
len += snprintf(buf + len, sizeof(buf) - len,
"txfifo_dcu_num_0: %2d txfifo_dcu_num_1: %2d\n",
(val[6] & 0x0001e000) >> 13, (val[6] & 0x001e0000) >> 17);

len += snprintf(buf + len, sizeof(buf) - len, "pcu observe: 0x%x \n",
REG_READ(ah, AR_OBS_BUS_1));
len += snprintf(buf + len, sizeof(buf) - len,
"AR_CR: 0x%x \n", REG_READ(ah, AR_CR));

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

static const struct file_operations fops_dma = {
.read = read_file_dma,
.open = ath9k_debugfs_open,
.owner = THIS_MODULE
};

int ath9k_init_debug(struct ath_softc *sc)
{
sc->sc_debug.debug_mask = ath9k_debug;
Expand All @@ -47,6 +141,11 @@ int ath9k_init_debug(struct ath_softc *sc)
if (!sc->sc_debug.debugfs_phy)
goto err;

sc->sc_debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,
sc->sc_debug.debugfs_phy, sc, &fops_dma);
if (!sc->sc_debug.debugfs_dma)
goto err;

return 0;
err:
ath9k_exit_debug(sc);
Expand All @@ -55,6 +154,7 @@ int ath9k_init_debug(struct ath_softc *sc)

void ath9k_exit_debug(struct ath_softc *sc)
{
debugfs_remove(sc->sc_debug.debugfs_dma);
debugfs_remove(sc->sc_debug.debugfs_phy);
debugfs_remove(sc->sc_debug.debugfs_root);
}
72 changes: 0 additions & 72 deletions drivers/net/wireless/ath9k/mac.c
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Expand Up @@ -40,78 +40,6 @@ static void ath9k_hw_set_txq_interrupts(struct ath_hal *ah,
AR_IMR_S2_QCU_TXURN, ahp->ah_txUrnInterruptMask);
}

void ath9k_hw_dmaRegDump(struct ath_hal *ah)
{
u32 val[ATH9K_NUM_DMA_DEBUG_REGS];
int qcuOffset = 0, dcuOffset = 0;
u32 *qcuBase = &val[0], *dcuBase = &val[4];
int i;

REG_WRITE(ah, AR_MACMISC,
((AR_MACMISC_DMA_OBS_LINE_8 << AR_MACMISC_DMA_OBS_S) |
(AR_MACMISC_MISC_OBS_BUS_1 <<
AR_MACMISC_MISC_OBS_BUS_MSB_S)));

DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "Raw DMA Debug values:\n");

for (i = 0; i < ATH9K_NUM_DMA_DEBUG_REGS; i++) {
if (i % 4 == 0)
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "\n");

val[i] = REG_READ(ah, AR_DMADBG_0 + (i * sizeof(u32)));
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "%d: %08x ", i, val[i]);
}

DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "\n\n");
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"Num QCU: chain_st fsp_ok fsp_st DCU: chain_st\n");

for (i = 0; i < ATH9K_NUM_QUEUES;
i++, qcuOffset += 4, dcuOffset += 5) {
if (i == 8) {
qcuOffset = 0;
qcuBase++;
}

if (i == 6) {
dcuOffset = 0;
dcuBase++;
}

DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"%2d %2x %1x %2x %2x\n",
i, (*qcuBase & (0x7 << qcuOffset)) >> qcuOffset,
(*qcuBase & (0x8 << qcuOffset)) >> (qcuOffset + 3),
val[2] & (0x7 << (i * 3)) >> (i * 3),
(*dcuBase & (0x1f << dcuOffset)) >> dcuOffset);
}

DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "\n");
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"qcu_stitch state: %2x qcu_fetch state: %2x\n",
(val[3] & 0x003c0000) >> 18, (val[3] & 0x03c00000) >> 22);
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"qcu_complete state: %2x dcu_complete state: %2x\n",
(val[3] & 0x1c000000) >> 26, (val[6] & 0x3));
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"dcu_arb state: %2x dcu_fp state: %2x\n",
(val[5] & 0x06000000) >> 25, (val[5] & 0x38000000) >> 27);
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"chan_idle_dur: %3d chan_idle_dur_valid: %1d\n",
(val[6] & 0x000003fc) >> 2, (val[6] & 0x00000400) >> 10);
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"txfifo_valid_0: %1d txfifo_valid_1: %1d\n",
(val[6] & 0x00000800) >> 11, (val[6] & 0x00001000) >> 12);
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"txfifo_dcu_num_0: %2d txfifo_dcu_num_1: %2d\n",
(val[6] & 0x0001e000) >> 13, (val[6] & 0x001e0000) >> 17);

DPRINTF(ah->ah_sc, ATH_DBG_REG_IO, "pcu observe 0x%x \n",
REG_READ(ah, AR_OBS_BUS_1));
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"AR_CR 0x%x \n", REG_READ(ah, AR_CR));
}

u32 ath9k_hw_gettxbuf(struct ath_hal *ah, u32 q)
{
return REG_READ(ah, AR_QTXDP(q));
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1 change: 1 addition & 0 deletions drivers/net/wireless/ath9k/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <linux/nl80211.h>
#include "core.h"
#include "reg.h"
#include "hw.h"

#define ATH_PCI_VERSION "0.1"

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