iwlwifi: fix 3945 ucode info retrieval after failure

When hardware or uCode problem occurs driver captures significant
information from device to enable debugging. The format of this information
is different between 3945 and 4965 and later devices, yet currently the
3945 uses the 4965 and later format. Fix this by adding a new library call
that is initialized to the correct formatting routine based on device.

This moves the iwlagn event and error log handling back to iwl-agn.c to
make it part of iwlagn module.

Also remove the 3945 sysfs file that triggers dump of event log - there is
already a debugfs file that can do it for all drivers.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 185 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 00457bff1ed1..cdc07c477457 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1526,6 +1526,191 @@ static int iwl_read_ucode(struct iwl_priv *priv)
         return ret;
 }
 
+#ifdef CONFIG_IWLWIFI_DEBUG
+static const char *desc_lookup_text[] = {
+        "OK",
+        "FAIL",
+        "BAD_PARAM",
+        "BAD_CHECKSUM",
+        "NMI_INTERRUPT_WDG",
+        "SYSASSERT",
+        "FATAL_ERROR",
+        "BAD_COMMAND",
+        "HW_ERROR_TUNE_LOCK",
+        "HW_ERROR_TEMPERATURE",
+        "ILLEGAL_CHAN_FREQ",
+        "VCC_NOT_STABLE",
+        "FH_ERROR",
+        "NMI_INTERRUPT_HOST",
+        "NMI_INTERRUPT_ACTION_PT",
+        "NMI_INTERRUPT_UNKNOWN",
+        "UCODE_VERSION_MISMATCH",
+        "HW_ERROR_ABS_LOCK",
+        "HW_ERROR_CAL_LOCK_FAIL",
+        "NMI_INTERRUPT_INST_ACTION_PT",
+        "NMI_INTERRUPT_DATA_ACTION_PT",
+        "NMI_TRM_HW_ER",
+        "NMI_INTERRUPT_TRM",
+        "NMI_INTERRUPT_BREAK_POINT"
+        "DEBUG_0",
+        "DEBUG_1",
+        "DEBUG_2",
+        "DEBUG_3",
+        "UNKNOWN"
+};
+
+static const char *desc_lookup(int i)
+{
+        int max = ARRAY_SIZE(desc_lookup_text) - 1;
+
+        if (i < 0 || i > max)
+                i = max;
+
+        return desc_lookup_text[i];
+}
+
+#define ERROR_START_OFFSET  (1 * sizeof(u32))
+#define ERROR_ELEM_SIZE     (7 * sizeof(u32))
+
+void iwl_dump_nic_error_log(struct iwl_priv *priv)
+{
+        u32 data2, line;
+        u32 desc, time, count, base, data1;
+        u32 blink1, blink2, ilink1, ilink2;
+
+        if (priv->ucode_type == UCODE_INIT)
+                base = le32_to_cpu(priv->card_alive_init.error_event_table_ptr);
+        else
+                base = le32_to_cpu(priv->card_alive.error_event_table_ptr);
+
+        if (!priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
+                IWL_ERR(priv, "Not valid error log pointer 0x%08X\n", base);
+                return;
+        }
+
+        count = iwl_read_targ_mem(priv, base);
+
+        if (ERROR_START_OFFSET <= count * ERROR_ELEM_SIZE) {
+                IWL_ERR(priv, "Start IWL Error Log Dump:\n");
+                IWL_ERR(priv, "Status: 0x%08lX, count: %d\n",
+                        priv->status, count);
+        }
+
+        desc = iwl_read_targ_mem(priv, base + 1 * sizeof(u32));
+        blink1 = iwl_read_targ_mem(priv, base + 3 * sizeof(u32));
+        blink2 = iwl_read_targ_mem(priv, base + 4 * sizeof(u32));
+        ilink1 = iwl_read_targ_mem(priv, base + 5 * sizeof(u32));
+        ilink2 = iwl_read_targ_mem(priv, base + 6 * sizeof(u32));
+        data1 = iwl_read_targ_mem(priv, base + 7 * sizeof(u32));
+        data2 = iwl_read_targ_mem(priv, base + 8 * sizeof(u32));
+        line = iwl_read_targ_mem(priv, base + 9 * sizeof(u32));
+        time = iwl_read_targ_mem(priv, base + 11 * sizeof(u32));
+
+        IWL_ERR(priv, "Desc                               Time       "
+                "data1      data2      line\n");
+        IWL_ERR(priv, "%-28s (#%02d) %010u 0x%08X 0x%08X %u\n",
+                desc_lookup(desc), desc, time, data1, data2, line);
+        IWL_ERR(priv, "blink1  blink2  ilink1  ilink2\n");
+        IWL_ERR(priv, "0x%05X 0x%05X 0x%05X 0x%05X\n", blink1, blink2,
+                ilink1, ilink2);
+
+}
+
+#define EVENT_START_OFFSET  (4 * sizeof(u32))
+
+/**
+ * iwl_print_event_log - Dump error event log to syslog
+ *
+ */
+static void iwl_print_event_log(struct iwl_priv *priv, u32 start_idx,
+                                u32 num_events, u32 mode)
+{
+        u32 i;
+        u32 base;       /* SRAM byte address of event log header */
+        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 */
+
+        if (num_events == 0)
+                return;
+        if (priv->ucode_type == UCODE_INIT)
+                base = le32_to_cpu(priv->card_alive_init.log_event_table_ptr);
+        else
+                base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
+
+        if (mode == 0)
+                event_size = 2 * sizeof(u32);
+        else
+                event_size = 3 * sizeof(u32);
+
+        ptr = base + EVENT_START_OFFSET + (start_idx * event_size);
+
+        /* "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);
+                if (mode == 0) {
+                        /* data, ev */
+                        IWL_ERR(priv, "EVT_LOG:0x%08x:%04u\n", time, ev);
+                } else {
+                        data = iwl_read_targ_mem(priv, ptr);
+                        ptr += sizeof(u32);
+                        IWL_ERR(priv, "EVT_LOGT:%010u:0x%08x:%04u\n",
+                                        time, data, ev);
+                }
+        }
+}
+
+void iwl_dump_nic_event_log(struct iwl_priv *priv)
+{
+        u32 base;       /* SRAM byte address of event log header */
+        u32 capacity;   /* event log capacity in # entries */
+        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 */
+        u32 size;       /* # entries that we'll print */
+
+        if (priv->ucode_type == UCODE_INIT)
+                base = le32_to_cpu(priv->card_alive_init.log_event_table_ptr);
+        else
+                base = le32_to_cpu(priv->card_alive.log_event_table_ptr);
+
+        if (!priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
+                IWL_ERR(priv, "Invalid event log pointer 0x%08X\n", base);
+                return;
+        }
+
+        /* event log header */
+        capacity = iwl_read_targ_mem(priv, base);
+        mode = iwl_read_targ_mem(priv, base + (1 * sizeof(u32)));
+        num_wraps = iwl_read_targ_mem(priv, base + (2 * sizeof(u32)));
+        next_entry = iwl_read_targ_mem(priv, base + (3 * sizeof(u32)));
+
+        size = num_wraps ? capacity : next_entry;
+
+        /* bail out if nothing in log */
+        if (size == 0) {
+                IWL_ERR(priv, "Start IWL Event Log Dump: nothing in log\n");
+                return;
+        }
+
+        IWL_ERR(priv, "Start IWL Event Log Dump: display count %d, wraps %d\n",
+                        size, num_wraps);
+
+        /* if uCode has wrapped back to top of log, start at the oldest entry,
+         * i.e the next one that uCode would fill. */
+        if (num_wraps)
+                iwl_print_event_log(priv, next_entry,
+                                        capacity - next_entry, mode);
+        /* (then/else) start at top of log */
+        iwl_print_event_log(priv, 0, next_entry, mode);
+
+}
+#endif
+
 /**
  * iwl_alive_start - called after REPLY_ALIVE notification received
  *                   from protocol/runtime uCode (initialization uCode's