libata: print feature list on device scan

Print a list of features supported by a drive when it is configured in
ata_dev_configure() using the new function ata_dev_print_features().
The features printed are not already advertized and are: trusted
send-recev support, device attention support, device sleep support,
NCQ send-recv support and NCQ priority support.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210816014456.2191776-9-damien.lemoal@wdc.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/libata-core.c

@@ -2433,6 +2433,20 @@ static void ata_dev_config_devslp(struct ata_device *dev)
 	}
 }
 
+static void ata_dev_print_features(struct ata_device *dev)
+{
+	if (!(dev->flags & ATA_DFLAG_FEATURES_MASK))
+		return;
+
+	ata_dev_info(dev,
+		     "Features:%s%s%s%s%s\n",
+		     dev->flags & ATA_DFLAG_TRUSTED ? " Trust" : "",
+		     dev->flags & ATA_DFLAG_DA ? " Dev-Attention" : "",
+		     dev->flags & ATA_DFLAG_DEVSLP ? " Dev-Sleep" : "",
+		     dev->flags & ATA_DFLAG_NCQ_SEND_RECV ? " NCQ-sndrcv" : "",
+		     dev->flags & ATA_DFLAG_NCQ_PRIO ? " NCQ-prio" : "");
+}
+
 /**
  *	ata_dev_configure - Configure the specified ATA/ATAPI device
  *	@dev: Target device to configure
@@ -2595,6 +2609,9 @@ int ata_dev_configure(struct ata_device *dev)
 		ata_dev_config_zac(dev);
 		ata_dev_config_trusted(dev);
 		dev->cdb_len = 32;
+
+		if (ata_msg_drv(ap) && print_info)
+			ata_dev_print_features(dev);
 	}
 
 	/* ATAPI-specific feature tests */

include/linux/libata.h

@@ -161,6 +161,10 @@ enum {
 	ATA_DFLAG_D_SENSE	= (1 << 29), /* Descriptor sense requested */
 	ATA_DFLAG_ZAC		= (1 << 30), /* ZAC device */
 
+	ATA_DFLAG_FEATURES_MASK	= ATA_DFLAG_TRUSTED | ATA_DFLAG_DA | \
+				  ATA_DFLAG_DEVSLP | ATA_DFLAG_NCQ_SEND_RECV | \
+				  ATA_DFLAG_NCQ_PRIO,
+
 	ATA_DEV_UNKNOWN		= 0,	/* unknown device */
 	ATA_DEV_ATA		= 1,	/* ATA device */
 	ATA_DEV_ATA_UNSUP	= 2,	/* ATA device (unsupported) */