iwl3945: add ucode statistics

Add general, rx and tx uCode statistics to 3945. This will help
in debugging

Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 71 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index d10e59def53e..9dad8672d700 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -49,6 +49,7 @@
 #include "iwl-helpers.h"
 #include "iwl-led.h"
 #include "iwl-3945-led.h"
+#include "iwl-3945-debugfs.h"
 
 #define IWL_DECLARE_RATE_INFO(r, ip, in, rp, rn, pp, np)    \
         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,   \
@@ -292,7 +293,7 @@ static void iwl3945_tx_queue_reclaim(struct iwl_priv *priv,
  * iwl3945_rx_reply_tx - Handle Tx response
  */
 static void iwl3945_rx_reply_tx(struct iwl_priv *priv,
-                            struct iwl_rx_mem_buffer *rxb)
+                                struct iwl_rx_mem_buffer *rxb)
 {
         struct iwl_rx_packet *pkt = rxb_addr(rxb);
         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
@@ -350,18 +351,81 @@ static void iwl3945_rx_reply_tx(struct iwl_priv *priv,
  *  RX handler implementations
  *
  *****************************************************************************/
+#ifdef CONFIG_IWLWIFI_DEBUG
+/*
+ *  based on the assumption of all statistics counter are in DWORD
+ *  FIXME: This function is for debugging, do not deal with
+ *  the case of counters roll-over.
+ */
+static void iwl3945_accumulative_statistics(struct iwl_priv *priv,
+                                            __le32 *stats)
+{
+        int i;
+        __le32 *prev_stats;
+        u32 *accum_stats;
+        u32 *delta, *max_delta;
+
+        prev_stats = (__le32 *)&priv->_3945.statistics;
+        accum_stats = (u32 *)&priv->_3945.accum_statistics;
+        delta = (u32 *)&priv->_3945.delta_statistics;
+        max_delta = (u32 *)&priv->_3945.max_delta;
+
+        for (i = sizeof(__le32); i < sizeof(struct iwl3945_notif_statistics);
+             i += sizeof(__le32), stats++, prev_stats++, delta++,
+             max_delta++, accum_stats++) {
+                if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
+                        *delta = (le32_to_cpu(*stats) -
+                                le32_to_cpu(*prev_stats));
+                        *accum_stats += *delta;
+                        if (*delta > *max_delta)
+                                *max_delta = *delta;
+                }
+        }
+
+        /* reset accumulative statistics for "no-counter" type statistics */
+        priv->_3945.accum_statistics.general.temperature =
+                priv->_3945.statistics.general.temperature;
+        priv->_3945.accum_statistics.general.ttl_timestamp =
+                priv->_3945.statistics.general.ttl_timestamp;
+}
+#endif
 
 void iwl3945_hw_rx_statistics(struct iwl_priv *priv,
                 struct iwl_rx_mem_buffer *rxb)
 {
         struct iwl_rx_packet *pkt = rxb_addr(rxb);
+
         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
                      (int)sizeof(struct iwl3945_notif_statistics),
                      le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
+#ifdef CONFIG_IWLWIFI_DEBUG
+        iwl3945_accumulative_statistics(priv, (__le32 *)&pkt->u.raw);
+#endif
 
         memcpy(&priv->_3945.statistics, pkt->u.raw, sizeof(priv->_3945.statistics));
 }
 
+void iwl3945_reply_statistics(struct iwl_priv *priv,
+                              struct iwl_rx_mem_buffer *rxb)
+{
+        struct iwl_rx_packet *pkt = rxb_addr(rxb);
+        __le32 *flag = (__le32 *)&pkt->u.raw;
+
+        if (le32_to_cpu(*flag) & UCODE_STATISTICS_CLEAR_MSK) {
+#ifdef CONFIG_IWLWIFI_DEBUG
+                memset(&priv->_3945.accum_statistics, 0,
+                        sizeof(struct iwl3945_notif_statistics));
+                memset(&priv->_3945.delta_statistics, 0,
+                        sizeof(struct iwl3945_notif_statistics));
+                memset(&priv->_3945.max_delta, 0,
+                        sizeof(struct iwl3945_notif_statistics));
+#endif
+                IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
+        }
+        iwl3945_hw_rx_statistics(priv, rxb);
+}
+
+
 /******************************************************************************
  *
  * Misc. internal state and helper functions
@@ -2735,6 +2799,12 @@ static struct iwl_lib_ops iwl3945_lib = {
         .isr = iwl_isr_legacy,
         .config_ap = iwl3945_config_ap,
         .add_bcast_station = iwl3945_add_bcast_station,
+
+        .debugfs_ops = {
+                .rx_stats_read = iwl3945_ucode_rx_stats_read,
+                .tx_stats_read = iwl3945_ucode_tx_stats_read,
+                .general_stats_read = iwl3945_ucode_general_stats_read,
+        },
 };
 
 static struct iwl_hcmd_utils_ops iwl3945_hcmd_utils = {