ice: Enable firmware logging during device initialization.

To enable FW logging, the "cq_en" and "uart_en" enable bits of the
"fw_log" element in struct ice_hw need to set accordingly based on
some user-provided parameters during driver loading. To select which
FW log events to be emitted, the "cfg" elements of corresponding FW
modules in the "evnts" array member of "fw_log" need to be configured.

Signed-off-by: Hieu Tran <hieu.t.tran@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

5 files changed, 286 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
index 3dadb2b01b5c..f8dfd675486c 100644
--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -1206,6 +1206,84 @@ struct ice_aqc_dis_txq {
 	struct ice_aqc_dis_txq_item qgrps[1];
 };
 
+/* Configure Firmware Logging Command (indirect 0xFF09)
+ * Logging Information Read Response (indirect 0xFF10)
+ * Note: The 0xFF10 command has no input parameters.
+ */
+struct ice_aqc_fw_logging {
+	u8 log_ctrl;
+#define ICE_AQC_FW_LOG_AQ_EN		BIT(0)
+#define ICE_AQC_FW_LOG_UART_EN		BIT(1)
+	u8 rsvd0;
+	u8 log_ctrl_valid; /* Not used by 0xFF10 Response */
+#define ICE_AQC_FW_LOG_AQ_VALID		BIT(0)
+#define ICE_AQC_FW_LOG_UART_VALID	BIT(1)
+	u8 rsvd1[5];
+	__le32 addr_high;
+	__le32 addr_low;
+};
+
+enum ice_aqc_fw_logging_mod {
+	ICE_AQC_FW_LOG_ID_GENERAL = 0,
+	ICE_AQC_FW_LOG_ID_CTRL,
+	ICE_AQC_FW_LOG_ID_LINK,
+	ICE_AQC_FW_LOG_ID_LINK_TOPO,
+	ICE_AQC_FW_LOG_ID_DNL,
+	ICE_AQC_FW_LOG_ID_I2C,
+	ICE_AQC_FW_LOG_ID_SDP,
+	ICE_AQC_FW_LOG_ID_MDIO,
+	ICE_AQC_FW_LOG_ID_ADMINQ,
+	ICE_AQC_FW_LOG_ID_HDMA,
+	ICE_AQC_FW_LOG_ID_LLDP,
+	ICE_AQC_FW_LOG_ID_DCBX,
+	ICE_AQC_FW_LOG_ID_DCB,
+	ICE_AQC_FW_LOG_ID_NETPROXY,
+	ICE_AQC_FW_LOG_ID_NVM,
+	ICE_AQC_FW_LOG_ID_AUTH,
+	ICE_AQC_FW_LOG_ID_VPD,
+	ICE_AQC_FW_LOG_ID_IOSF,
+	ICE_AQC_FW_LOG_ID_PARSER,
+	ICE_AQC_FW_LOG_ID_SW,
+	ICE_AQC_FW_LOG_ID_SCHEDULER,
+	ICE_AQC_FW_LOG_ID_TXQ,
+	ICE_AQC_FW_LOG_ID_RSVD,
+	ICE_AQC_FW_LOG_ID_POST,
+	ICE_AQC_FW_LOG_ID_WATCHDOG,
+	ICE_AQC_FW_LOG_ID_TASK_DISPATCH,
+	ICE_AQC_FW_LOG_ID_MNG,
+	ICE_AQC_FW_LOG_ID_MAX,
+};
+
+/* This is the buffer for both of the logging commands.
+ * The entry array size depends on the datalen parameter in the descriptor.
+ * There will be a total of datalen / 2 entries.
+ */
+struct ice_aqc_fw_logging_data {
+	__le16 entry[1];
+#define ICE_AQC_FW_LOG_ID_S		0
+#define ICE_AQC_FW_LOG_ID_M		(0xFFF << ICE_AQC_FW_LOG_ID_S)
+
+#define ICE_AQC_FW_LOG_CONF_SUCCESS	0	/* Used by response */
+#define ICE_AQC_FW_LOG_CONF_BAD_INDX	BIT(12)	/* Used by response */
+
+#define ICE_AQC_FW_LOG_EN_S		12
+#define ICE_AQC_FW_LOG_EN_M		(0xF << ICE_AQC_FW_LOG_EN_S)
+#define ICE_AQC_FW_LOG_INFO_EN		BIT(12)	/* Used by command */
+#define ICE_AQC_FW_LOG_INIT_EN		BIT(13)	/* Used by command */
+#define ICE_AQC_FW_LOG_FLOW_EN		BIT(14)	/* Used by command */
+#define ICE_AQC_FW_LOG_ERR_EN		BIT(15)	/* Used by command */
+};
+
+/* Get/Clear FW Log (indirect 0xFF11) */
+struct ice_aqc_get_clear_fw_log {
+	u8 flags;
+#define ICE_AQC_FW_LOG_CLEAR		BIT(0)
+#define ICE_AQC_FW_LOG_MORE_DATA_AVAIL	BIT(1)
+	u8 rsvd1[7];
+	__le32 addr_high;
+	__le32 addr_low;
+};
+
 /**
  * struct ice_aq_desc - Admin Queue (AQ) descriptor
  * @flags: ICE_AQ_FLAG_* flags
@@ -1256,6 +1334,8 @@ struct ice_aq_desc {
 		struct ice_aqc_dis_txqs dis_txqs;
 		struct ice_aqc_add_get_update_free_vsi vsi_cmd;
 		struct ice_aqc_add_update_free_vsi_resp add_update_free_vsi_res;
+		struct ice_aqc_fw_logging fw_logging;
+		struct ice_aqc_get_clear_fw_log get_clear_fw_log;
 		struct ice_aqc_alloc_free_res_cmd sw_res_ctrl;
 		struct ice_aqc_set_event_mask set_event_mask;
 		struct ice_aqc_get_link_status get_link_status;
@@ -1353,6 +1433,9 @@ enum ice_adminq_opc {
 	/* TX queue handling commands/events */
 	ice_aqc_opc_add_txqs				= 0x0C30,
 	ice_aqc_opc_dis_txqs				= 0x0C31,
+
+	/* debug commands */
+	ice_aqc_opc_fw_logging				= 0xFF09,
 };
 
 #endif /* _ICE_ADMINQ_CMD_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 52c2bf4f108e..0847dbf9d42f 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -427,6 +427,176 @@ static void ice_cleanup_fltr_mgmt_struct(struct ice_hw *hw)
 	devm_kfree(ice_hw_to_dev(hw), sw);
 }
 
+#define ICE_FW_LOG_DESC_SIZE(n)	(sizeof(struct ice_aqc_fw_logging_data) + \
+	(((n) - 1) * sizeof(((struct ice_aqc_fw_logging_data *)0)->entry)))
+#define ICE_FW_LOG_DESC_SIZE_MAX	\
+	ICE_FW_LOG_DESC_SIZE(ICE_AQC_FW_LOG_ID_MAX)
+
+/**
+ * ice_cfg_fw_log - configure FW logging
+ * @hw: pointer to the hw struct
+ * @enable: enable certain FW logging events if true, disable all if false
+ *
+ * This function enables/disables the FW logging via Rx CQ events and a UART
+ * port based on predetermined configurations. FW logging via the Rx CQ can be
+ * enabled/disabled for individual PF's. However, FW logging via the UART can
+ * only be enabled/disabled for all PFs on the same device.
+ *
+ * To enable overall FW logging, the "cq_en" and "uart_en" enable bits in
+ * hw->fw_log need to be set accordingly, e.g. based on user-provided input,
+ * before initializing the device.
+ *
+ * When re/configuring FW logging, callers need to update the "cfg" elements of
+ * the hw->fw_log.evnts array with the desired logging event configurations for
+ * modules of interest. When disabling FW logging completely, the callers can
+ * just pass false in the "enable" parameter. On completion, the function will
+ * update the "cur" element of the hw->fw_log.evnts array with the resulting
+ * logging event configurations of the modules that are being re/configured. FW
+ * logging modules that are not part of a reconfiguration operation retain their
+ * previous states.
+ *
+ * Before resetting the device, it is recommended that the driver disables FW
+ * logging before shutting down the control queue. When disabling FW logging
+ * ("enable" = false), the latest configurations of FW logging events stored in
+ * hw->fw_log.evnts[] are not overridden to allow them to be reconfigured after
+ * a device reset.
+ *
+ * When enabling FW logging to emit log messages via the Rx CQ during the
+ * device's initialization phase, a mechanism alternative to interrupt handlers
+ * needs to be used to extract FW log messages from the Rx CQ periodically and
+ * to prevent the Rx CQ from being full and stalling other types of control
+ * messages from FW to SW. Interrupts are typically disabled during the device's
+ * initialization phase.
+ */
+static enum ice_status ice_cfg_fw_log(struct ice_hw *hw, bool enable)
+{
+	struct ice_aqc_fw_logging_data *data = NULL;
+	struct ice_aqc_fw_logging *cmd;
+	enum ice_status status = 0;
+	u16 i, chgs = 0, len = 0;
+	struct ice_aq_desc desc;
+	u8 actv_evnts = 0;
+	void *buf = NULL;
+
+	if (!hw->fw_log.cq_en && !hw->fw_log.uart_en)
+		return 0;
+
+	/* Disable FW logging only when the control queue is still responsive */
+	if (!enable &&
+	    (!hw->fw_log.actv_evnts || !ice_check_sq_alive(hw, &hw->adminq)))
+		return 0;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_fw_logging);
+	cmd = &desc.params.fw_logging;
+
+	/* Indicate which controls are valid */
+	if (hw->fw_log.cq_en)
+		cmd->log_ctrl_valid |= ICE_AQC_FW_LOG_AQ_VALID;
+
+	if (hw->fw_log.uart_en)
+		cmd->log_ctrl_valid |= ICE_AQC_FW_LOG_UART_VALID;
+
+	if (enable) {
+		/* Fill in an array of entries with FW logging modules and
+		 * logging events being reconfigured.
+		 */
+		for (i = 0; i < ICE_AQC_FW_LOG_ID_MAX; i++) {
+			u16 val;
+
+			/* Keep track of enabled event types */
+			actv_evnts |= hw->fw_log.evnts[i].cfg;
+
+			if (hw->fw_log.evnts[i].cfg == hw->fw_log.evnts[i].cur)
+				continue;
+
+			if (!data) {
+				data = devm_kzalloc(ice_hw_to_dev(hw),
+						    ICE_FW_LOG_DESC_SIZE_MAX,
+						    GFP_KERNEL);
+				if (!data)
+					return ICE_ERR_NO_MEMORY;
+			}
+
+			val = i << ICE_AQC_FW_LOG_ID_S;
+			val |= hw->fw_log.evnts[i].cfg << ICE_AQC_FW_LOG_EN_S;
+			data->entry[chgs++] = cpu_to_le16(val);
+		}
+
+		/* Only enable FW logging if at least one module is specified.
+		 * If FW logging is currently enabled but all modules are not
+		 * enabled to emit log messages, disable FW logging altogether.
+		 */
+		if (actv_evnts) {
+			/* Leave if there is effectively no change */
+			if (!chgs)
+				goto out;
+
+			if (hw->fw_log.cq_en)
+				cmd->log_ctrl |= ICE_AQC_FW_LOG_AQ_EN;
+
+			if (hw->fw_log.uart_en)
+				cmd->log_ctrl |= ICE_AQC_FW_LOG_UART_EN;
+
+			buf = data;
+			len = ICE_FW_LOG_DESC_SIZE(chgs);
+			desc.flags |= cpu_to_le16(ICE_AQ_FLAG_RD);
+		}
+	}
+
+	status = ice_aq_send_cmd(hw, &desc, buf, len, NULL);
+	if (!status) {
+		/* Update the current configuration to reflect events enabled.
+		 * hw->fw_log.cq_en and hw->fw_log.uart_en indicate if the FW
+		 * logging mode is enabled for the device. They do not reflect
+		 * actual modules being enabled to emit log messages. So, their
+		 * values remain unchanged even when all modules are disabled.
+		 */
+		u16 cnt = enable ? chgs : (u16)ICE_AQC_FW_LOG_ID_MAX;
+
+		hw->fw_log.actv_evnts = actv_evnts;
+		for (i = 0; i < cnt; i++) {
+			u16 v, m;
+
+			if (!enable) {
+				/* When disabling all FW logging events as part
+				 * of device's de-initialization, the original
+				 * configurations are retained, and can be used
+				 * to reconfigure FW logging later if the device
+				 * is re-initialized.
+				 */
+				hw->fw_log.evnts[i].cur = 0;
+				continue;
+			}
+
+			v = le16_to_cpu(data->entry[i]);
+			m = (v & ICE_AQC_FW_LOG_ID_M) >> ICE_AQC_FW_LOG_ID_S;
+			hw->fw_log.evnts[m].cur = hw->fw_log.evnts[m].cfg;
+		}
+	}
+
+out:
+	if (data)
+		devm_kfree(ice_hw_to_dev(hw), data);
+
+	return status;
+}
+
+/**
+ * ice_output_fw_log
+ * @hw: pointer to the hw struct
+ * @desc: pointer to the AQ message descriptor
+ * @buf: pointer to the buffer accompanying the AQ message
+ *
+ * Formats a FW Log message and outputs it via the standard driver logs.
+ */
+void ice_output_fw_log(struct ice_hw *hw, struct ice_aq_desc *desc, void *buf)
+{
+	ice_debug(hw, ICE_DBG_AQ_MSG, "[ FW Log Msg Start ]\n");
+	ice_debug_array(hw, ICE_DBG_AQ_MSG, 16, 1, (u8 *)buf,
+			le16_to_cpu(desc->datalen));
+	ice_debug(hw, ICE_DBG_AQ_MSG, "[ FW Log Msg End ]\n");
+}
+
 /**
  * ice_init_hw - main hardware initialization routine
  * @hw: pointer to the hardware structure
@@ -461,6 +631,11 @@ enum ice_status ice_init_hw(struct ice_hw *hw)
 	if (status)
 		goto err_unroll_cqinit;
 
+	/* Enable FW logging. Not fatal if this fails. */
+	status = ice_cfg_fw_log(hw, true);
+	if (status)
+		ice_debug(hw, ICE_DBG_INIT, "Failed to enable FW logging.\n");
+
 	status = ice_clear_pf_cfg(hw);
 	if (status)
 		goto err_unroll_cqinit;
@@ -574,15 +749,18 @@ err_unroll_cqinit:
  */
 void ice_deinit_hw(struct ice_hw *hw)
 {
+	ice_cleanup_fltr_mgmt_struct(hw);
+
 	ice_sched_cleanup_all(hw);
-	ice_shutdown_all_ctrlq(hw);
 
 	if (hw->port_info) {
 		devm_kfree(ice_hw_to_dev(hw), hw->port_info);
 		hw->port_info = NULL;
 	}
 
-	ice_cleanup_fltr_mgmt_struct(hw);
+	/* Attempt to disable FW logging before shutting down control queues */
+	ice_cfg_fw_log(hw, false);
+	ice_shutdown_all_ctrlq(hw);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_common.h b/drivers/net/ethernet/intel/ice/ice_common.h
index 409b9957f407..aac2d6cadaaf 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.h
+++ b/drivers/net/ethernet/intel/ice/ice_common.h
@@ -95,4 +95,5 @@ enum ice_status
 ice_ena_vsi_txq(struct ice_port_info *pi, u16 vsi_id, u8 tc, u8 num_qgrps,
 		struct ice_aqc_add_tx_qgrp *buf, u16 buf_size,
 		struct ice_sq_cd *cd);
+void ice_output_fw_log(struct ice_hw *hw, struct ice_aq_desc *desc, void *buf);
 #endif /* _ICE_COMMON_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index cbeae1355593..f04e124bca8c 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -984,6 +984,9 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)
 				dev_err(&pf->pdev->dev,
 					"Could not handle link event\n");
 			break;
+		case ice_aqc_opc_fw_logging:
+			ice_output_fw_log(hw, &event.desc, event.msg_buf);
+			break;
 		default:
 			dev_dbg(&pf->pdev->dev,
 				"%s Receive Queue unknown event 0x%04x ignored\n",
diff --git a/drivers/net/ethernet/intel/ice/ice_type.h b/drivers/net/ethernet/intel/ice/ice_type.h
index 8b7efa87ce56..e681804be4d4 100644
--- a/drivers/net/ethernet/intel/ice/ice_type.h
+++ b/drivers/net/ethernet/intel/ice/ice_type.h
@@ -258,6 +258,24 @@ struct ice_switch_info {
 	struct ice_sw_recipe *recp_list;
 };
 
+/* FW logging configuration */
+struct ice_fw_log_evnt {
+	u8 cfg : 4;	/* New event enables to configure */
+	u8 cur : 4;	/* Current/active event enables */
+};
+
+struct ice_fw_log_cfg {
+	u8 cq_en : 1;    /* FW logging is enabled via the control queue */
+	u8 uart_en : 1;  /* FW logging is enabled via UART for all PFs */
+	u8 actv_evnts;   /* Cumulation of currently enabled log events */
+
+#define ICE_FW_LOG_EVNT_INFO	(ICE_AQC_FW_LOG_INFO_EN >> ICE_AQC_FW_LOG_EN_S)
+#define ICE_FW_LOG_EVNT_INIT	(ICE_AQC_FW_LOG_INIT_EN >> ICE_AQC_FW_LOG_EN_S)
+#define ICE_FW_LOG_EVNT_FLOW	(ICE_AQC_FW_LOG_FLOW_EN >> ICE_AQC_FW_LOG_EN_S)
+#define ICE_FW_LOG_EVNT_ERR	(ICE_AQC_FW_LOG_ERR_EN >> ICE_AQC_FW_LOG_EN_S)
+	struct ice_fw_log_evnt evnts[ICE_AQC_FW_LOG_ID_MAX];
+};
+
 /* Port hardware description */
 struct ice_hw {
 	u8 __iomem *hw_addr;
@@ -307,6 +325,7 @@ struct ice_hw {
 	u8 fw_patch;		/* firmware patch version */
 	u32 fw_build;		/* firmware build number */
 
+	struct ice_fw_log_cfg fw_log;
 	/* minimum allowed value for different speeds */
 #define ICE_ITR_GRAN_MIN_200	1
 #define ICE_ITR_GRAN_MIN_100	1