Re: [PATCH] libata support for rotation speed

[Matthew Wilcox <matthew@wil.cx>]

On Thu, Jun 19, 2008 at 03:01:33PM -0400, Jeff Garzik wrote:
> Matthew Wilcox wrote:
> >On Thu, Jun 19, 2008 at 01:24:55PM -0500, James Bottomley wrote:
> >>This looks like it can be called for ATA_DEV_ATAPI as well, in which
> >>case it's an illegal page to ask for.
> >
> >I was under the impression that this entire file is only used for
> >non-atapi devices.
> 
> Correct.  That code path is not travelled by ATAPI.

Thanks, Jeff.  Here's version three, including the form factor from word
168:


Add support for VPD page b1 to libata

SCSI VPD page b1 reports the nominal rotation speed and physical size
of the device.  Devices that conform to ATA-8 can return this information
in words 217 and 168 of the identify data.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2e6e162..c08c3b9 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1778,7 +1778,9 @@ static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
 	const u8 pages[] = {
 		0x00,	/* page 0x00, this page */
 		0x80,	/* page 0x80, unit serial no page */
-		0x83	/* page 0x83, device ident page */
+		0x83,	/* page 0x83, device ident page */
+		0x89,	/* page 0x89, ata info page */
+		0xb1,	/* page 0xb1, block device characteristics page */
 	};
 
 	rbuf[3] = sizeof(pages);	/* number of supported VPD pages */
@@ -1899,6 +1901,19 @@ static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
 	return 0;
 }
 
+static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
+{
+	rbuf[1] = 0xb1;
+	rbuf[3] = 0x3c;
+	if (ata_id_major_version(args->id) > 7) {
+		rbuf[4] = args->id[217] >> 8;
+		rbuf[5] = args->id[217];
+		rbuf[7] = args->id[168] & 0xf;
+	}
+
+	return 0;
+}
+
 /**
  *	ata_scsiop_noop - Command handler that simply returns success.
  *	@args: device IDENTIFY data / SCSI command of interest.
@@ -2922,6 +2937,9 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 		case 0x89:
 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
 			break;
+		case 0xb1:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
+			break;
 		default:
 			ata_scsi_invalid_field(cmd, done);
 			break;

-- 
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"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
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