[Intel-wired-lan] [PATCH net-next v14 3/5] ice: enable FW logging

[Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>]

Once users have configured the FW logging then allow them to enable it
by writing to the 'fwlog/enable' file. The file accepts a boolean value
(0 or 1) where 1 means enable FW logging and 0 means disable FW logging.
The user can read the 'fwlog/enable' file to see whether logging is
enabled or not. Reading the actual data is a separate patch.

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
---
v13->v14: fixed an issue where reading the file produced an 8 instead of
a 1
v12->v13: created a new patch for the enable code
---
 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |   3 +
 drivers/net/ethernet/intel/ice/ice_common.c   |   1 +
 drivers/net/ethernet/intel/ice/ice_debugfs.c  | 115 ++++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_fwlog.c    |  90 ++++++++++++++
 drivers/net/ethernet/intel/ice/ice_fwlog.h    |   3 +
 5 files changed, 212 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
index 2d1073ee1e0f..09aa63225544 100644
--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -2120,6 +2120,7 @@ enum ice_aqc_fw_logging_mod {
 };
 
 /* Set FW Logging configuration (indirect 0xFF30)
+ * Register for FW Logging (indirect 0xFF31)
  * Query FW Logging (indirect 0xFF32)
  */
 struct ice_aqc_fw_log {
@@ -2128,6 +2129,7 @@ struct ice_aqc_fw_log {
 #define ICE_AQC_FW_LOG_CONF_AQ_EN	BIT(1)
 #define ICE_AQC_FW_LOG_QUERY_REGISTERED	BIT(2)
 #define ICE_AQC_FW_LOG_CONF_SET_VALID	BIT(3)
+#define ICE_AQC_FW_LOG_AQ_REGISTER	BIT(0)
 #define ICE_AQC_FW_LOG_AQ_QUERY		BIT(2)
 
 	u8 rsp_flag;
@@ -2421,6 +2423,7 @@ enum ice_adminq_opc {
 
 	/* FW Logging Commands */
 	ice_aqc_opc_fw_logs_config			= 0xFF30,
+	ice_aqc_opc_fw_logs_register			= 0xFF31,
 	ice_aqc_opc_fw_logs_query			= 0xFF32,
 };
 
diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 12dc94b473f1..e5e2461ef117 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1031,6 +1031,7 @@ void ice_deinit_hw(struct ice_hw *hw)
 	ice_free_hw_tbls(hw);
 	mutex_destroy(&hw->tnl_lock);
 
+	ice_fwlog_deinit(hw);
 	ice_destroy_all_ctrlq(hw);
 
 	/* Clear VSI contexts if not already cleared */
diff --git a/drivers/net/ethernet/intel/ice/ice_debugfs.c b/drivers/net/ethernet/intel/ice/ice_debugfs.c
index 7590b6ae08bc..097b8f40081e 100644
--- a/drivers/net/ethernet/intel/ice/ice_debugfs.c
+++ b/drivers/net/ethernet/intel/ice/ice_debugfs.c
@@ -397,6 +397,118 @@ static const struct file_operations ice_debugfs_resolution_fops = {
 	.write = ice_debugfs_resolution_write,
 };
 
+/**
+ * ice_debugfs_enable_read - read from 'enable' file
+ * @filp: the opened file
+ * @buffer: where to write the data for the user to read
+ * @count: the size of the user's buffer
+ * @ppos: file position offset
+ */
+static ssize_t ice_debugfs_enable_read(struct file *filp,
+				       char __user *buffer, size_t count,
+				       loff_t *ppos)
+{
+	struct ice_pf *pf = filp->private_data;
+	struct ice_hw *hw = &pf->hw;
+	char buff[32] = {};
+	int status;
+
+	/* don't allow commands if the FW doesn't support it */
+	if (!ice_fwlog_supported(&pf->hw))
+		return -EOPNOTSUPP;
+
+	snprintf(buff, sizeof(buff), "%u\n",
+		 (u16)(hw->fwlog_cfg.options &
+		 ICE_FWLOG_OPTION_IS_REGISTERED) >> 3);
+
+	status = simple_read_from_buffer(buffer, count, ppos, buff,
+					 strlen(buff));
+
+	return status;
+}
+
+/**
+ * ice_debugfs_enable_write - write into 'enable' file
+ * @filp: the opened file
+ * @buf: where to find the user's data
+ * @count: the length of the user's data
+ * @ppos: file position offset
+ */
+static ssize_t
+ice_debugfs_enable_write(struct file *filp, const char __user *buf,
+			 size_t count, loff_t *ppos)
+{
+	struct ice_pf *pf = filp->private_data;
+	struct device *dev = ice_pf_to_dev(pf);
+	struct ice_hw *hw = &pf->hw;
+	ssize_t ret;
+	char **argv;
+	int argc;
+
+	/* don't allow commands if the FW doesn't support it */
+	if (!ice_fwlog_supported(hw))
+		return -EOPNOTSUPP;
+
+	/* don't allow partial writes */
+	if (*ppos != 0)
+		return 0;
+
+	ret = ice_debugfs_parse_cmd_line(buf, count, &argv, &argc);
+	if (ret)
+		goto err_copy_from_user;
+
+	if (argc == 1) {
+		bool enable;
+
+		ret = kstrtobool(argv[0], &enable);
+		if (ret)
+			goto enable_write_error;
+
+		if (enable)
+			hw->fwlog_cfg.options |= ICE_FWLOG_OPTION_ARQ_ENA;
+		else
+			hw->fwlog_cfg.options &= ~ICE_FWLOG_OPTION_ARQ_ENA;
+
+		ret = ice_fwlog_set(hw, &hw->fwlog_cfg);
+		if (ret)
+			goto enable_write_error;
+
+		if (enable)
+			ret = ice_fwlog_register(hw);
+		else
+			ret = ice_fwlog_unregister(hw);
+
+		if (ret)
+			goto enable_write_error;
+	} else {
+		dev_info(dev, "unknown or invalid command '%s'\n", argv[0]);
+		ret = -EINVAL;
+		goto enable_write_error;
+	}
+
+	/* if we get here, nothing went wrong; return bytes copied */
+	ret = (ssize_t)count;
+
+enable_write_error:
+	argv_free(argv);
+err_copy_from_user:
+	/* This function always consumes all of the written input, or produces
+	 * an error. Check and enforce this. Otherwise, the write operation
+	 * won't complete properly.
+	 */
+	if (WARN_ON(ret != (ssize_t)count && ret >= 0))
+		ret = -EIO;
+
+	return ret;
+}
+
+static const struct file_operations ice_debugfs_enable_fops = {
+	.owner = THIS_MODULE,
+	.open  = simple_open,
+	.read = ice_debugfs_enable_read,
+	.write = ice_debugfs_enable_write,
+};
+
 /**
  * ice_debugfs_fwlog_init - setup the debugfs directory
  * @pf: the ice that is starting up
@@ -428,6 +540,9 @@ void ice_debugfs_fwlog_init(struct ice_pf *pf)
 	debugfs_create_file("resolution", 0600,
 			    pf->ice_debugfs_pf_fwlog, pf,
 			    &ice_debugfs_resolution_fops);
+
+	debugfs_create_file("enable", 0600, pf->ice_debugfs_pf_fwlog,
+			    pf, &ice_debugfs_enable_fops);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_fwlog.c b/drivers/net/ethernet/intel/ice/ice_fwlog.c
index 1f4b474dcc97..e882a13cf13f 100644
--- a/drivers/net/ethernet/intel/ice/ice_fwlog.c
+++ b/drivers/net/ethernet/intel/ice/ice_fwlog.c
@@ -32,6 +32,34 @@ int ice_fwlog_init(struct ice_hw *hw)
 	return 0;
 }
 
+/**
+ * ice_fwlog_deinit - unroll FW logging configuration
+ * @hw: pointer to the HW structure
+ *
+ * This function should be called in ice_deinit_hw().
+ */
+void ice_fwlog_deinit(struct ice_hw *hw)
+{
+	int status;
+
+	/* only support fw log commands on PF 0 */
+	if (hw->bus.func)
+		return;
+
+	/* make sure FW logging is disabled to not put the FW in a weird state
+	 * for the next driver load
+	 */
+	hw->fwlog_cfg.options &= ~ICE_FWLOG_OPTION_ARQ_ENA;
+	status = ice_fwlog_set(hw, &hw->fwlog_cfg);
+	if (status)
+		dev_warn(ice_hw_to_dev(hw), "Unable to turn off FW logging, status: %d\n", status);
+
+	status = ice_fwlog_unregister(hw);
+	if (status)
+		dev_warn(ice_hw_to_dev(hw), "Unable to unregister FW logging, status: %d\n",
+			 status);
+}
+
 /**
  * ice_fwlog_supported - Cached for whether FW supports FW logging or not
  * @hw: pointer to the HW structure
@@ -164,6 +192,8 @@ static int ice_aq_fwlog_get(struct ice_hw *hw, struct ice_fwlog_cfg *cfg)
 		cfg->options |= ICE_FWLOG_OPTION_ARQ_ENA;
 	if (cmd->cmd_flags & ICE_AQC_FW_LOG_CONF_UART_EN)
 		cfg->options |= ICE_FWLOG_OPTION_UART_ENA;
+	if (cmd->cmd_flags & ICE_AQC_FW_LOG_QUERY_REGISTERED)
+		cfg->options |= ICE_FWLOG_OPTION_IS_REGISTERED;
 
 	fw_modules = (struct ice_aqc_fw_log_cfg_resp *)buf;
 
@@ -196,6 +226,66 @@ int ice_fwlog_get(struct ice_hw *hw, struct ice_fwlog_cfg *cfg)
 	return ice_aq_fwlog_get(hw, cfg);
 }
 
+/**
+ * ice_aq_fwlog_register - Register PF for firmware logging events (0xFF31)
+ * @hw: pointer to the HW structure
+ * @reg: true to register and false to unregister
+ */
+static int ice_aq_fwlog_register(struct ice_hw *hw, bool reg)
+{
+	struct ice_aq_desc desc;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_fw_logs_register);
+
+	if (reg)
+		desc.params.fw_log.cmd_flags = ICE_AQC_FW_LOG_AQ_REGISTER;
+
+	return ice_aq_send_cmd(hw, &desc, NULL, 0, NULL);
+}
+
+/**
+ * ice_fwlog_register - Register the PF for firmware logging
+ * @hw: pointer to the HW structure
+ *
+ * After this call the PF will start to receive firmware logging based on the
+ * configuration set in ice_fwlog_set.
+ */
+int ice_fwlog_register(struct ice_hw *hw)
+{
+	int status;
+
+	if (!ice_fwlog_supported(hw))
+		return -EOPNOTSUPP;
+
+	status = ice_aq_fwlog_register(hw, true);
+	if (status)
+		ice_debug(hw, ICE_DBG_FW_LOG, "Failed to register for firmware logging events over ARQ\n");
+	else
+		hw->fwlog_cfg.options |= ICE_FWLOG_OPTION_IS_REGISTERED;
+
+	return status;
+}
+
+/**
+ * ice_fwlog_unregister - Unregister the PF from firmware logging
+ * @hw: pointer to the HW structure
+ */
+int ice_fwlog_unregister(struct ice_hw *hw)
+{
+	int status;
+
+	if (!ice_fwlog_supported(hw))
+		return -EOPNOTSUPP;
+
+	status = ice_aq_fwlog_register(hw, false);
+	if (status)
+		ice_debug(hw, ICE_DBG_FW_LOG, "Failed to unregister from firmware logging events over ARQ\n");
+	else
+		hw->fwlog_cfg.options &= ~ICE_FWLOG_OPTION_IS_REGISTERED;
+
+	return status;
+}
+
 /**
  * ice_fwlog_set_supported - Set if FW logging is supported by FW
  * @hw: pointer to the HW struct
diff --git a/drivers/net/ethernet/intel/ice/ice_fwlog.h b/drivers/net/ethernet/intel/ice/ice_fwlog.h
index 5a4194527cf9..45865558425d 100644
--- a/drivers/net/ethernet/intel/ice/ice_fwlog.h
+++ b/drivers/net/ethernet/intel/ice/ice_fwlog.h
@@ -50,6 +50,9 @@ struct ice_fwlog_cfg {
 void ice_fwlog_set_supported(struct ice_hw *hw);
 bool ice_fwlog_supported(struct ice_hw *hw);
 int ice_fwlog_init(struct ice_hw *hw);
+void ice_fwlog_deinit(struct ice_hw *hw);
 int ice_fwlog_set(struct ice_hw *hw, struct ice_fwlog_cfg *cfg);
 int ice_fwlog_get(struct ice_hw *hw, struct ice_fwlog_cfg *cfg);
+int ice_fwlog_register(struct ice_hw *hw);
+int ice_fwlog_unregister(struct ice_hw *hw);
 #endif /* _ICE_FWLOG_H_ */
-- 
2.35.1

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