iwlwifi: display flowhandler register when sw error or on-demand

Flowhandler handle the communication between driver and uCode, when any
uCode error happen, we also like to know what is the status of the
flowhandler; it can help to debug flowhandler related problem.

Also adding debugfs file to dump current value of flowhandler registers.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 9d6c144..28d97f5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1353,6 +1353,8 @@ void iwl_irq_handle_error(struct iwl_priv *priv)
 	priv->cfg->ops->lib->dump_nic_error_log(priv);
 	if (priv->cfg->ops->lib->dump_csr)
 		priv->cfg->ops->lib->dump_csr(priv);
+	if (priv->cfg->ops->lib->dump_fh)
+		priv->cfg->ops->lib->dump_fh(priv, NULL, false);
 	priv->cfg->ops->lib->dump_nic_event_log(priv, false, NULL, false);
 #ifdef CONFIG_IWLWIFI_DEBUG
 	if (iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS)
@@ -3278,6 +3280,69 @@ void iwl_dump_csr(struct iwl_priv *priv)
 }
 EXPORT_SYMBOL(iwl_dump_csr);
 
+const static char *get_fh_string(int cmd)
+{
+	switch (cmd) {
+		IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
+		IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
+		IWL_CMD(FH_RSCSR_CHNL0_WPTR);
+		IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
+		IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
+		IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
+		IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
+		IWL_CMD(FH_TSSR_TX_STATUS_REG);
+		IWL_CMD(FH_TSSR_TX_ERROR_REG);
+	default:
+		return "UNKNOWN";
+
+	}
+}
+
+int iwl_dump_fh(struct iwl_priv *priv, char **buf, bool display)
+{
+	int i;
+#ifdef CONFIG_IWLWIFI_DEBUG
+	int pos = 0;
+	size_t bufsz = 0;
+#endif
+	u32 fh_tbl[] = {
+		FH_RSCSR_CHNL0_STTS_WPTR_REG,
+		FH_RSCSR_CHNL0_RBDCB_BASE_REG,
+		FH_RSCSR_CHNL0_WPTR,
+		FH_MEM_RCSR_CHNL0_CONFIG_REG,
+		FH_MEM_RSSR_SHARED_CTRL_REG,
+		FH_MEM_RSSR_RX_STATUS_REG,
+		FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
+		FH_TSSR_TX_STATUS_REG,
+		FH_TSSR_TX_ERROR_REG
+	};
+#ifdef CONFIG_IWLWIFI_DEBUG
+	if (display) {
+		bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
+		*buf = kmalloc(bufsz, GFP_KERNEL);
+		if (!*buf)
+			return -ENOMEM;
+		pos += scnprintf(*buf + pos, bufsz - pos,
+				"FH register values:\n");
+		for (i = 0; i < ARRAY_SIZE(fh_tbl); i++) {
+			pos += scnprintf(*buf + pos, bufsz - pos,
+				"  %34s: 0X%08x\n",
+				get_fh_string(fh_tbl[i]),
+				iwl_read_direct32(priv, fh_tbl[i]));
+		}
+		return pos;
+	}
+#endif
+	IWL_ERR(priv, "FH register values:\n");
+	for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++) {
+		IWL_ERR(priv, "  %34s: 0X%08x\n",
+			get_fh_string(fh_tbl[i]),
+			iwl_read_direct32(priv, fh_tbl[i]));
+	}
+	return 0;
+}
+EXPORT_SYMBOL(iwl_dump_fh);
+
 #ifdef CONFIG_PM
 
 int iwl_pci_suspend(struct pci_dev *pdev, pm_message_t state)