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iwlwifi: speed up event log dumps 

Take advantage of device's auto-increment for SRAM reads to eliminate extra
write address accesses.

Grab/release NIC access before/after entire read sequence, rather than for
each read individually.

After a quick check of dmesg logs, this seems to double Event Log dump speed,
reducing from about 20 milliseconds to about 10 milliseconds for 512 entries
using 3945.

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ben Cahill 2009-11-06 14:52:58 -08:00 committed by John W. Linville
parent 84c4069232
commit e585447189
2 changed files with 32 additions and 12 deletions
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22
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -1666,6 +1666,7 @@ static void iwl_print_event_log(struct iwl_priv *priv, u32 start_idx,
u32 event_size; /* 2 u32s, or 3 u32s if timestamp recorded */
u32 ptr; /* SRAM byte address of log data */
u32 ev, time, data; /* event log data */
unsigned long reg_flags;
if (num_events == 0)
return;
@ -1681,25 +1682,34 @@ static void iwl_print_event_log(struct iwl_priv *priv, u32 start_idx,
ptr = base + EVENT_START_OFFSET + (start_idx * event_size);
/* Make sure device is powered up for SRAM reads */
spin_lock_irqsave(&priv->reg_lock, reg_flags);
iwl_grab_nic_access(priv);
/* Set starting address; reads will auto-increment */
_iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, ptr);
rmb();
/* "time" is actually "data" for mode 0 (no timestamp).
* place event id # at far right for easier visual parsing. */
for (i = 0; i < num_events; i++) {
ev = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
time = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
ev = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
time = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
if (mode == 0) {
/* data, ev */
trace_iwlwifi_dev_ucode_event(priv, 0, time, ev);
IWL_ERR(priv, "EVT_LOG:0x%08x:%04u\n", time, ev);
} else {
data = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
data = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
IWL_ERR(priv, "EVT_LOGT:%010u:0x%08x:%04u\n",
time, data, ev);
trace_iwlwifi_dev_ucode_event(priv, time, data, ev);
}
}
/* Allow device to power down */
iwl_release_nic_access(priv);
spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
}
/* For sanity check only. Actual size is determined by uCode, typ. 512 */

22
drivers/net/wireless/iwlwifi/iwl3945-base.c
View File

@ -1570,6 +1570,7 @@ static void iwl3945_print_event_log(struct iwl_priv *priv, u32 start_idx,
u32 event_size; /* 2 u32s, or 3 u32s if timestamp recorded */
u32 ptr; /* SRAM byte address of log data */
u32 ev, time, data; /* event log data */
unsigned long reg_flags;
if (num_events == 0)
return;
@ -1583,24 +1584,33 @@ static void iwl3945_print_event_log(struct iwl_priv *priv, u32 start_idx,
ptr = base + EVENT_START_OFFSET + (start_idx * event_size);
/* Make sure device is powered up for SRAM reads */
spin_lock_irqsave(&priv->reg_lock, reg_flags);
iwl_grab_nic_access(priv);
/* Set starting address; reads will auto-increment */
_iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, ptr);
rmb();
/* "time" is actually "data" for mode 0 (no timestamp).
* place event id # at far right for easier visual parsing. */
for (i = 0; i < num_events; i++) {
ev = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
time = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
ev = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
time = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
if (mode == 0) {
/* data, ev */
IWL_ERR(priv, "0x%08x\t%04u\n", time, ev);
trace_iwlwifi_dev_ucode_event(priv, 0, time, ev);
} else {
data = iwl_read_targ_mem(priv, ptr);
ptr += sizeof(u32);
data = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
IWL_ERR(priv, "%010u\t0x%08x\t%04u\n", time, data, ev);
trace_iwlwifi_dev_ucode_event(priv, time, data, ev);
}
}
/* Allow device to power down */
iwl_release_nic_access(priv);
spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
}
/* For sanity check only. Actual size is determined by uCode, typ. 512 */