iwlagn: add testmode trace command

Adding testmode trace/debug capability

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

5 files changed, 165 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index a7054a5ee34a..e027f99f18a5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3659,6 +3659,7 @@ static void __devexit iwl_pci_remove(struct pci_dev *pdev)
          */
         set_bit(STATUS_EXIT_PENDING, &priv->status);
 
+        iwl_testmode_cleanup(priv);
         iwl_leds_exit(priv);
 
         if (priv->mac80211_registered) {
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.h b/drivers/net/wireless/iwlwifi/iwl-agn.h
index fc7dc0628316..2495fe7a58cb 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.h
@@ -343,6 +343,7 @@ extern int iwl_alive_start(struct iwl_priv *priv);
 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
 extern int iwl_testmode_cmd(struct ieee80211_hw *hw, void *data, int len);
 extern void iwl_testmode_init(struct iwl_priv *priv);
+extern void iwl_testmode_cleanup(struct iwl_priv *priv);
 #else
 static inline
 int iwl_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
@@ -353,6 +354,10 @@ static inline
 void iwl_testmode_init(struct iwl_priv *priv)
 {
 }
+static inline
+void iwl_testmode_cleanup(struct iwl_priv *priv)
+{
+}
 #endif
 
 #endif /* __iwl_agn_h__ */
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 3e3b8b8939d6..12fb2f4ca0b1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1179,6 +1179,14 @@ enum iwl_scan_type {
         IWL_SCAN_OFFCH_TX,
 };
 
+#ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
+struct iwl_testmode_trace {
+        u8 *cpu_addr;
+        u8 *trace_addr;
+        dma_addr_t dma_addr;
+        bool trace_enabled;
+};
+#endif
 struct iwl_priv {
 
         /* ieee device used by generic ieee processing code */
@@ -1510,6 +1518,9 @@ struct iwl_priv {
         struct led_classdev led;
         unsigned long blink_on, blink_off;
         bool led_registered;
+#ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
+        struct iwl_testmode_trace testmode_trace;
+#endif
 }; /*iwl_priv */
 
 static inline void iwl_txq_ctx_activate(struct iwl_priv *priv, int txq_id)
diff --git a/drivers/net/wireless/iwlwifi/iwl-sv-open.c b/drivers/net/wireless/iwlwifi/iwl-sv-open.c
index dd2904aa9be2..b778c3f4b84d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sv-open.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sv-open.c
@@ -97,6 +97,10 @@ struct nla_policy iwl_testmode_gnl_msg_policy[IWL_TM_ATTR_MAX] = {
 
         [IWL_TM_ATTR_SYNC_RSP] = { .type = NLA_UNSPEC, },
         [IWL_TM_ATTR_UCODE_RX_PKT] = { .type = NLA_UNSPEC, },
+
+        [IWL_TM_ATTR_TRACE_ADDR] = { .type = NLA_UNSPEC, },
+        [IWL_TM_ATTR_TRACE_DATA] = { .type = NLA_UNSPEC, },
+
 };
 
 /*
@@ -167,6 +171,31 @@ nla_put_failure:
 void iwl_testmode_init(struct iwl_priv *priv)
 {
         priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
+        priv->testmode_trace.trace_enabled = false;
+}
+
+static void iwl_trace_cleanup(struct iwl_priv *priv)
+{
+        struct device *dev = &priv->pci_dev->dev;
+
+        if (priv->testmode_trace.trace_enabled) {
+                if (priv->testmode_trace.cpu_addr &&
+                    priv->testmode_trace.dma_addr)
+                        dma_free_coherent(dev,
+                                        TRACE_TOTAL_SIZE,
+                                        priv->testmode_trace.cpu_addr,
+                                        priv->testmode_trace.dma_addr);
+                priv->testmode_trace.trace_enabled = false;
+                priv->testmode_trace.cpu_addr = NULL;
+                priv->testmode_trace.trace_addr = NULL;
+                priv->testmode_trace.dma_addr = 0;
+        }
+}
+
+
+void iwl_testmode_cleanup(struct iwl_priv *priv)
+{
+        iwl_trace_cleanup(priv);
 }
 
 /*
@@ -400,6 +429,102 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
+
+/*
+ * This function handles the user application commands for uCode trace
+ *
+ * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
+ * handlers respectively.
+ *
+ * If it's an unknown commdn ID, -ENOSYS is replied; otherwise, the returned
+ * value of the actual command execution is replied to the user application.
+ *
+ * @hw: ieee80211_hw object that represents the device
+ * @tb: gnl message fields from the user space
+ */
+static int iwl_testmode_trace(struct ieee80211_hw *hw, struct nlattr **tb)
+{
+        struct iwl_priv *priv = hw->priv;
+        struct sk_buff *skb;
+        int status = 0;
+        struct device *dev = &priv->pci_dev->dev;
+
+        switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
+        case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
+                if (priv->testmode_trace.trace_enabled)
+                        return -EBUSY;
+
+                priv->testmode_trace.cpu_addr =
+                        dma_alloc_coherent(dev,
+                                           TRACE_TOTAL_SIZE,
+                                           &priv->testmode_trace.dma_addr,
+                                           GFP_KERNEL);
+                if (!priv->testmode_trace.cpu_addr)
+                        return -ENOMEM;
+                priv->testmode_trace.trace_enabled = true;
+                priv->testmode_trace.trace_addr = (u8 *)PTR_ALIGN(
+                        priv->testmode_trace.cpu_addr, 0x100);
+                memset(priv->testmode_trace.trace_addr, 0x03B,
+                        TRACE_BUFF_SIZE);
+                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
+                        sizeof(priv->testmode_trace.dma_addr) + 20);
+                if (!skb) {
+                        IWL_DEBUG_INFO(priv,
+                                "Error allocating memory\n");
+                        iwl_trace_cleanup(priv);
+                        return -ENOMEM;
+                }
+                NLA_PUT(skb, IWL_TM_ATTR_TRACE_ADDR,
+                        sizeof(priv->testmode_trace.dma_addr),
+                        (u64 *)&priv->testmode_trace.dma_addr);
+                status = cfg80211_testmode_reply(skb);
+                if (status < 0) {
+                        IWL_DEBUG_INFO(priv,
+                                       "Error sending msg : %d\n",
+                                       status);
+                }
+                break;
+
+        case IWL_TM_CMD_APP2DEV_END_TRACE:
+                iwl_trace_cleanup(priv);
+                break;
+
+        case IWL_TM_CMD_APP2DEV_READ_TRACE:
+                if (priv->testmode_trace.trace_enabled &&
+                    priv->testmode_trace.trace_addr) {
+                        skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
+                                20 + TRACE_BUFF_SIZE);
+                        if (skb == NULL) {
+                                IWL_DEBUG_INFO(priv,
+                                        "Error allocating memory\n");
+                                return -ENOMEM;
+                        }
+                        NLA_PUT(skb, IWL_TM_ATTR_TRACE_DATA,
+                                TRACE_BUFF_SIZE,
+                                priv->testmode_trace.trace_addr);
+                        status = cfg80211_testmode_reply(skb);
+                        if (status < 0) {
+                                IWL_DEBUG_INFO(priv,
+                                       "Error sending msg : %d\n", status);
+                        }
+                } else
+                        return -EFAULT;
+                break;
+
+        default:
+                IWL_DEBUG_INFO(priv, "Unknown testmode mem command ID\n");
+                return -ENOSYS;
+        }
+        return status;
+
+nla_put_failure:
+        kfree_skb(skb);
+        if (nla_get_u32(tb[IWL_TM_ATTR_COMMAND]) ==
+            IWL_TM_CMD_APP2DEV_BEGIN_TRACE)
+                iwl_trace_cleanup(priv);
+        return -EMSGSIZE;
+}
+
 /* The testmode gnl message handler that takes the gnl message from the
  * user space and parses it per the policy iwl_testmode_gnl_msg_policy, then
  * invoke the corresponding handlers.
@@ -459,6 +584,14 @@ int iwl_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
                 IWL_DEBUG_INFO(priv, "testmode cmd to driver\n");
                 result = iwl_testmode_driver(hw, tb);
                 break;
+
+        case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
+        case IWL_TM_CMD_APP2DEV_END_TRACE:
+        case IWL_TM_CMD_APP2DEV_READ_TRACE:
+                IWL_DEBUG_INFO(priv, "testmode uCode trace cmd to driver\n");
+                result = iwl_testmode_trace(hw, tb);
+                break;
+
         default:
                 IWL_DEBUG_INFO(priv, "Unknown testmode command\n");
                 result = -ENOSYS;
diff --git a/drivers/net/wireless/iwlwifi/iwl-testmode.h b/drivers/net/wireless/iwlwifi/iwl-testmode.h
index 31f8949f2801..34634eca94ec 100644
--- a/drivers/net/wireless/iwlwifi/iwl-testmode.h
+++ b/drivers/net/wireless/iwlwifi/iwl-testmode.h
@@ -91,6 +91,10 @@ enum iwl_tm_cmd_t {
         /* if there is other new command for the driver layer operation,
          * append them here */
 
+        /* commands fom user space for uCode trace operations */
+        IWL_TM_CMD_APP2DEV_BEGIN_TRACE,
+        IWL_TM_CMD_APP2DEV_END_TRACE,
+        IWL_TM_CMD_APP2DEV_READ_TRACE,
 
         /* commands from kernel space to carry the synchronous response
          * to user application */
@@ -144,8 +148,19 @@ enum iwl_tm_attr_t {
          * application */
         IWL_TM_ATTR_UCODE_RX_PKT,
 
+        /* When IWL_TM_ATTR_COMMAND is IWL_TM_CMD_APP2DEV_XXX_TRACE,
+         * The mandatory fields are:
+         * IWL_TM_ATTR_MEM_TRACE_ADDR for the trace address
+         */
+        IWL_TM_ATTR_TRACE_ADDR,
+        IWL_TM_ATTR_TRACE_DATA,
+
         IWL_TM_ATTR_MAX,
 };
 
+/* uCode trace buffer */
+#define TRACE_BUFF_SIZE         0x20000
+#define TRACE_BUFF_PADD         0x2000
+#define TRACE_TOTAL_SIZE        (TRACE_BUFF_SIZE + TRACE_BUFF_PADD)
 
 #endif