diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn.c | 99 |
1 files changed, 71 insertions, 28 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c index 7321e7d31406..3e429a3e518d 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c @@ -315,7 +315,7 @@ static void iwl_bg_statistics_periodic(unsigned long data) static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base, u32 start_idx, u32 num_events, - u32 mode) + u32 capacity, u32 mode) { u32 i; u32 ptr; /* SRAM byte address of log data */ @@ -339,6 +339,15 @@ static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base, rmb(); /* + * Refuse to read more than would have fit into the log from + * the current start_idx. This used to happen due to the race + * described below, but now WARN because the code below should + * prevent it from happening here. + */ + if (WARN_ON(num_events > capacity - start_idx)) + num_events = capacity - start_idx; + + /* * "time" is actually "data" for mode 0 (no timestamp). * place event id # at far right for easier visual parsing. */ @@ -346,12 +355,11 @@ static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base, ev = iwl_read32(bus(priv), HBUS_TARG_MEM_RDAT); time = iwl_read32(bus(priv), HBUS_TARG_MEM_RDAT); if (mode == 0) { - trace_iwlwifi_dev_ucode_cont_event(priv, - 0, time, ev); + trace_iwlwifi_dev_ucode_cont_event(priv, 0, time, ev); } else { data = iwl_read32(bus(priv), HBUS_TARG_MEM_RDAT); - trace_iwlwifi_dev_ucode_cont_event(priv, - time, data, ev); + trace_iwlwifi_dev_ucode_cont_event(priv, time, + data, ev); } } /* Allow device to power down */ @@ -362,53 +370,83 @@ static void iwl_print_cont_event_trace(struct iwl_priv *priv, u32 base, static void iwl_continuous_event_trace(struct iwl_priv *priv) { u32 capacity; /* event log capacity in # entries */ + struct { + u32 capacity; + u32 mode; + u32 wrap_counter; + u32 write_counter; + } __packed read; u32 base; /* SRAM byte address of event log header */ u32 mode; /* 0 - no timestamp, 1 - timestamp recorded */ u32 num_wraps; /* # times uCode wrapped to top of log */ u32 next_entry; /* index of next entry to be written by uCode */ - base = priv->shrd->device_pointers.error_event_table; + base = priv->shrd->device_pointers.log_event_table; if (iwlagn_hw_valid_rtc_data_addr(base)) { - capacity = iwl_read_targ_mem(bus(priv), base); - num_wraps = iwl_read_targ_mem(bus(priv), - base + (2 * sizeof(u32))); - mode = iwl_read_targ_mem(bus(priv), base + (1 * sizeof(u32))); - next_entry = iwl_read_targ_mem(bus(priv), - base + (3 * sizeof(u32))); + iwl_read_targ_mem_words(bus(priv), base, &read, sizeof(read)); + + capacity = read.capacity; + mode = read.mode; + num_wraps = read.wrap_counter; + next_entry = read.write_counter; } else return; + /* + * Unfortunately, the uCode doesn't use temporary variables. + * Therefore, it can happen that we read next_entry == capacity, + * which really means next_entry == 0. + */ + if (unlikely(next_entry == capacity)) + next_entry = 0; + /* + * Additionally, the uCode increases the write pointer before + * the wraps counter, so if the write pointer is smaller than + * the old write pointer (wrap occurred) but we read that no + * wrap occurred, we actually read between the next_entry and + * num_wraps update (this does happen in practice!!) -- take + * that into account by increasing num_wraps. + */ + if (unlikely(next_entry < priv->event_log.next_entry && + num_wraps == priv->event_log.num_wraps)) + num_wraps++; + if (num_wraps == priv->event_log.num_wraps) { - iwl_print_cont_event_trace(priv, - base, priv->event_log.next_entry, - next_entry - priv->event_log.next_entry, - mode); + iwl_print_cont_event_trace( + priv, base, priv->event_log.next_entry, + next_entry - priv->event_log.next_entry, + capacity, mode); + priv->event_log.non_wraps_count++; } else { - if ((num_wraps - priv->event_log.num_wraps) > 1) + if (num_wraps - priv->event_log.num_wraps > 1) priv->event_log.wraps_more_count++; else priv->event_log.wraps_once_count++; + trace_iwlwifi_dev_ucode_wrap_event(priv, num_wraps - priv->event_log.num_wraps, next_entry, priv->event_log.next_entry); + if (next_entry < priv->event_log.next_entry) { - iwl_print_cont_event_trace(priv, base, - priv->event_log.next_entry, - capacity - priv->event_log.next_entry, - mode); + iwl_print_cont_event_trace( + priv, base, priv->event_log.next_entry, + capacity - priv->event_log.next_entry, + capacity, mode); - iwl_print_cont_event_trace(priv, base, 0, - next_entry, mode); + iwl_print_cont_event_trace( + priv, base, 0, next_entry, capacity, mode); } else { - iwl_print_cont_event_trace(priv, base, - next_entry, capacity - next_entry, - mode); + iwl_print_cont_event_trace( + priv, base, next_entry, + capacity - next_entry, + capacity, mode); - iwl_print_cont_event_trace(priv, base, 0, - next_entry, mode); + iwl_print_cont_event_trace( + priv, base, 0, next_entry, capacity, mode); } } + priv->event_log.num_wraps = num_wraps; priv->event_log.next_entry = next_entry; } @@ -1219,6 +1257,11 @@ int iwl_alive_start(struct iwl_priv *priv) if (iwl_is_rfkill(priv->shrd)) return -ERFKILL; + if (priv->event_log.ucode_trace) { + /* start collecting data now */ + mod_timer(&priv->ucode_trace, jiffies); + } + /* download priority table before any calibration request */ if (cfg(priv)->bt_params && cfg(priv)->bt_params->advanced_bt_coexist) { |