IB/hfi1: Add active channel and backplane support for integrated devices

Use scratch registers within the HFI1 device to recover signal
integrity information that is then used to tune the channel. While
there, update error messages to better convey the result of falling
back to a backup file.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 117 insertions, 19 deletions

diff --git a/drivers/infiniband/hw/hfi1/firmware.c b/drivers/infiniband/hw/hfi1/firmware.c
index 13db8eb4f4ec..9a36c8c2f8a1 100644
--- a/drivers/infiniband/hw/hfi1/firmware.c
+++ b/drivers/infiniband/hw/hfi1/firmware.c
@@ -707,6 +707,9 @@ static int obtain_firmware(struct hfi1_devdata *dd)
 				       &dd->pcidev->dev);
 		if (err) {
 			platform_config = NULL;
+			dd_dev_err(dd,
+				   "%s: No default platform config file found\n",
+				   __func__);
 			goto done;
 		}
 		dd->platform_config.data = platform_config->data;
@@ -1761,8 +1764,17 @@ int parse_platform_config(struct hfi1_devdata *dd)
 	u32 record_idx = 0, table_type = 0, table_length_dwords = 0;
 	int ret = -EINVAL; /* assume failure */
 
+	/*
+	 * For integrated devices that did not fall back to the default file,
+	 * the SI tuning information for active channels is acquired from the
+	 * scratch register bitmap, thus there is no platform config to parse.
+	 * Skip parsing in these situations.
+	 */
+	if (is_integrated(dd) && !platform_config_load)
+		return 0;
+
 	if (!dd->platform_config.data) {
-		dd_dev_info(dd, "%s: Missing config file\n", __func__);
+		dd_dev_err(dd, "%s: Missing config file\n", __func__);
 		goto bail;
 	}
 	ptr = (u32 *)dd->platform_config.data;
@@ -1770,7 +1782,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 	magic_num = *ptr;
 	ptr++;
 	if (magic_num != PLATFORM_CONFIG_MAGIC_NUM) {
-		dd_dev_info(dd, "%s: Bad config file\n", __func__);
+		dd_dev_err(dd, "%s: Bad config file\n", __func__);
 		goto bail;
 	}
 
@@ -1797,9 +1809,9 @@ int parse_platform_config(struct hfi1_devdata *dd)
 		header1 = *ptr;
 		header2 = *(ptr + 1);
 		if (header1 != ~header2) {
-			dd_dev_info(dd, "%s: Failed validation at offset %ld\n",
-				    __func__, (ptr - (u32 *)
-					       dd->platform_config.data));
+			dd_dev_err(dd, "%s: Failed validation at offset %ld\n",
+				   __func__, (ptr - (u32 *)
+					      dd->platform_config.data));
 			goto bail;
 		}
 
@@ -1841,11 +1853,11 @@ int parse_platform_config(struct hfi1_devdata *dd)
 							table_length_dwords;
 				break;
 			default:
-				dd_dev_info(dd,
-					    "%s: Unknown data table %d, offset %ld\n",
-					    __func__, table_type,
-					    (ptr - (u32 *)
-					     dd->platform_config.data));
+				dd_dev_err(dd,
+					   "%s: Unknown data table %d, offset %ld\n",
+					   __func__, table_type,
+					   (ptr - (u32 *)
+					    dd->platform_config.data));
 				goto bail; /* We don't trust this file now */
 			}
 			pcfgcache->config_tables[table_type].table = ptr;
@@ -1865,11 +1877,11 @@ int parse_platform_config(struct hfi1_devdata *dd)
 			case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
 				break;
 			default:
-				dd_dev_info(dd,
-					    "%s: Unknown meta table %d, offset %ld\n",
-					    __func__, table_type,
-					    (ptr -
-					     (u32 *)dd->platform_config.data));
+				dd_dev_err(dd,
+					   "%s: Unknown meta table %d, offset %ld\n",
+					   __func__, table_type,
+					   (ptr -
+					    (u32 *)dd->platform_config.data));
 				goto bail; /* We don't trust this file now */
 			}
 			pcfgcache->config_tables[table_type].table_metadata =
@@ -1884,10 +1896,9 @@ int parse_platform_config(struct hfi1_devdata *dd)
 		/* Jump the table */
 		ptr += table_length_dwords;
 		if (crc != *ptr) {
-			dd_dev_info(dd, "%s: Failed CRC check at offset %ld\n",
-				    __func__, (ptr -
-					       (u32 *)
-					       dd->platform_config.data));
+			dd_dev_err(dd, "%s: Failed CRC check at offset %ld\n",
+				   __func__, (ptr -
+				   (u32 *)dd->platform_config.data));
 			goto bail;
 		}
 		/* Jump the CRC DWORD */
@@ -1901,6 +1912,84 @@ bail:
 	return ret;
 }
 
+static void get_integrated_platform_config_field(
+		struct hfi1_devdata *dd,
+		enum platform_config_table_type_encoding table_type,
+		int field_index, u32 *data)
+{
+	struct hfi1_pportdata *ppd = dd->pport;
+	u8 *cache = ppd->qsfp_info.cache;
+	u32 tx_preset = 0;
+
+	switch (table_type) {
+	case PLATFORM_CONFIG_SYSTEM_TABLE:
+		if (field_index == SYSTEM_TABLE_QSFP_POWER_CLASS_MAX)
+			*data = ppd->max_power_class;
+		else if (field_index == SYSTEM_TABLE_QSFP_ATTENUATION_DEFAULT_25G)
+			*data = ppd->default_atten;
+		break;
+	case PLATFORM_CONFIG_PORT_TABLE:
+		if (field_index == PORT_TABLE_PORT_TYPE)
+			*data = ppd->port_type;
+		else if (field_index == PORT_TABLE_LOCAL_ATTEN_25G)
+			*data = ppd->local_atten;
+		else if (field_index == PORT_TABLE_REMOTE_ATTEN_25G)
+			*data = ppd->remote_atten;
+		break;
+	case PLATFORM_CONFIG_RX_PRESET_TABLE:
+		if (field_index == RX_PRESET_TABLE_QSFP_RX_CDR_APPLY)
+			*data = (ppd->rx_preset & QSFP_RX_CDR_APPLY_SMASK) >>
+				QSFP_RX_CDR_APPLY_SHIFT;
+		else if (field_index == RX_PRESET_TABLE_QSFP_RX_EMP_APPLY)
+			*data = (ppd->rx_preset & QSFP_RX_EMP_APPLY_SMASK) >>
+				QSFP_RX_EMP_APPLY_SHIFT;
+		else if (field_index == RX_PRESET_TABLE_QSFP_RX_AMP_APPLY)
+			*data = (ppd->rx_preset & QSFP_RX_AMP_APPLY_SMASK) >>
+				QSFP_RX_AMP_APPLY_SHIFT;
+		else if (field_index == RX_PRESET_TABLE_QSFP_RX_CDR)
+			*data = (ppd->rx_preset & QSFP_RX_CDR_SMASK) >>
+				QSFP_RX_CDR_SHIFT;
+		else if (field_index == RX_PRESET_TABLE_QSFP_RX_EMP)
+			*data = (ppd->rx_preset & QSFP_RX_EMP_SMASK) >>
+				QSFP_RX_EMP_SHIFT;
+		else if (field_index == RX_PRESET_TABLE_QSFP_RX_AMP)
+			*data = (ppd->rx_preset & QSFP_RX_AMP_SMASK) >>
+				QSFP_RX_AMP_SHIFT;
+		break;
+	case PLATFORM_CONFIG_TX_PRESET_TABLE:
+		if (cache[QSFP_EQ_INFO_OFFS] & 0x4)
+			tx_preset = ppd->tx_preset_eq;
+		else
+			tx_preset = ppd->tx_preset_noeq;
+		if (field_index == TX_PRESET_TABLE_PRECUR)
+			*data = (tx_preset & TX_PRECUR_SMASK) >>
+				TX_PRECUR_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_ATTN)
+			*data = (tx_preset & TX_ATTN_SMASK) >>
+				TX_ATTN_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_POSTCUR)
+			*data = (tx_preset & TX_POSTCUR_SMASK) >>
+				TX_POSTCUR_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_QSFP_TX_CDR_APPLY)
+			*data = (tx_preset & QSFP_TX_CDR_APPLY_SMASK) >>
+				QSFP_TX_CDR_APPLY_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_QSFP_TX_EQ_APPLY)
+			*data = (tx_preset & QSFP_TX_EQ_APPLY_SMASK) >>
+				QSFP_TX_EQ_APPLY_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_QSFP_TX_CDR)
+			*data = (tx_preset & QSFP_TX_CDR_SMASK) >>
+				QSFP_TX_CDR_SHIFT;
+		else if (field_index == TX_PRESET_TABLE_QSFP_TX_EQ)
+			*data = (tx_preset & QSFP_TX_EQ_SMASK) >>
+				QSFP_TX_EQ_SHIFT;
+		break;
+	case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
+	case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
+	default:
+		break;
+	}
+}
+
 static int get_platform_fw_field_metadata(struct hfi1_devdata *dd, int table,
 					  int field, u32 *field_len_bits,
 					  u32 *field_start_bits)
@@ -1976,6 +2065,15 @@ int get_platform_config_field(struct hfi1_devdata *dd,
 	else
 		return -EINVAL;
 
+	if (is_integrated(dd) && !platform_config_load) {
+		/*
+		 * Use saved configuration from ppd for integrated platforms
+		 */
+		get_integrated_platform_config_field(dd, table_type,
+						     field_index, data);
+		return 0;
+	}
+
 	ret = get_platform_fw_field_metadata(dd, table_type, field_index,
 					     &field_len_bits,
 					     &field_start_bits);