scsi: sd: usb_storage: uas: Access media prior to querying device properties

JIRA: https://issues.redhat.com/browse/RHEL-34114

commit 321da3dc1f3c92a12e3c5da934090d2992a8814c
Author: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Tue, 13 Feb 2024 09:33:06 -0500

  It has been observed that some USB/UAS devices return generic properties
  hardcoded in firmware for mode pages for a period of time after a device
  has been discovered. The reported properties are either garbage or they do
  not accurately reflect the characteristics of the physical storage device
  attached in the case of a bridge.

  Prior to commit 1e029397d12f ("scsi: sd: Reorganize DIF/DIX code to
  avoid calling revalidate twice") we would call revalidate several
  times during device discovery. As a result, incorrect values would
  eventually get replaced with ones accurately describing the attached
  storage. When we did away with the redundant revalidate pass, several
  cases were reported where devices reported nonsensical values or would
  end up in write-protected state.

  An initial attempt at addressing this issue involved introducing a
  delayed second revalidate invocation. However, this approach still
  left some devices reporting incorrect characteristics.

  Tasos Sahanidis debugged the problem further and identified that
  introducing a READ operation prior to MODE SENSE fixed the problem and that
  it wasn't a timing issue. Issuing a READ appears to cause the devices to
  update their state to reflect the actual properties of the storage
  media. Device properties like vendor, model, and storage capacity appear to
  be correctly reported from the get-go. It is unclear why these devices
  defer populating the remaining characteristics.

  Match the behavior of a well known commercial operating system and
  trigger a READ operation prior to querying device characteristics to
  force the device to populate the mode pages.

  The additional READ is triggered by a flag set in the USB storage and
  UAS drivers. We avoid issuing the READ for other transport classes
  since some storage devices identify Linux through our particular
  discovery command sequence.

  Link: https://lore.kernel.org/r/20240213143306.2194237-1-martin.petersen@oracle.com
  Fixes: 1e029397d12f ("scsi: sd: Reorganize DIF/DIX code to avoid calling revalidate twice")
  Cc: stable@vger.kernel.org
  Reported-by: Tasos Sahanidis <tasos@tasossah.com>
  Reviewed-by: Ewan D. Milne <emilne@redhat.com>
  Reviewed-by: Bart Van Assche <bvanassche@acm.org>
  Tested-by: Tasos Sahanidis <tasos@tasossah.com>
  Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

drivers/scsi/sd.c

@@ -3206,6 +3206,24 @@ static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
 	return true;
 }
 
+static void sd_read_block_zero(struct scsi_disk *sdkp)
+{
+	unsigned int buf_len = sdkp->device->sector_size;
+	char *buffer, cmd[10] = { };
+
+	buffer = kmalloc(buf_len, GFP_KERNEL);
+	if (!buffer)
+		return;
+
+	cmd[0] = READ_10;
+	put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
+	put_unaligned_be16(1, &cmd[7]);	/* Transfer 1 logical block */
+
+	scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len,
+			 SD_TIMEOUT, sdkp->max_retries, NULL);
+	kfree(buffer);
+}
+
 /**
  *	sd_revalidate_disk - called the first time a new disk is seen,
  *	performs disk spin up, read_capacity, etc.
@@ -3245,7 +3263,13 @@ static int sd_revalidate_disk(struct gendisk *disk)
 	 */
 	if (sdkp->media_present) {
 		sd_read_capacity(sdkp, buffer);
-
+		/*
+		 * Some USB/UAS devices return generic values for mode pages
+		 * until the media has been accessed. Trigger a READ operation
+		 * to force the device to populate mode pages.
+		 */
+		if (sdp->read_before_ms)
+			sd_read_block_zero(sdkp);
 		/*
 		 * set the default to rotational.  All non-rotational devices
 		 * support the block characteristics VPD page, which will

drivers/usb/storage/scsiglue.c

@@ -179,6 +179,13 @@ static int slave_configure(struct scsi_device *sdev)
 		 */
 		sdev->use_192_bytes_for_3f = 1;
 
+		/*
+		 * Some devices report generic values until the media has been
+		 * accessed. Force a READ(10) prior to querying device
+		 * characteristics.
+		 */
+		sdev->read_before_ms = 1;
+
 		/*
 		 * Some devices don't like MODE SENSE with page=0x3f,
 		 * which is the command used for checking if a device

drivers/usb/storage/uas.c

@@ -879,6 +879,13 @@ static int uas_slave_configure(struct scsi_device *sdev)
 	if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
 		sdev->guess_capacity = 1;
 
+	/*
+	 * Some devices report generic values until the media has been
+	 * accessed. Force a READ(10) prior to querying device
+	 * characteristics.
+	 */
+	sdev->read_before_ms = 1;
+
 	/*
 	 * Some devices don't like MODE SENSE with page=0x3f,
 	 * which is the command used for checking if a device

include/scsi/scsi_device.h

@@ -182,6 +182,7 @@ struct scsi_device {
 	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 	unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
+	unsigned read_before_ms:1;	/* perform a READ before MODE SENSE */
 	unsigned no_report_opcodes:1;	/* no REPORT SUPPORTED OPERATION CODES */
 	unsigned no_write_same:1;	/* no WRITE SAME command */
 	unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */