* Martin K. Petersen <martin.petersen@xxxxxxxxxx> [2023-03-06 21:54:42]:
Hi Martin,
>
> Lee,
>
> > I really prefer specifically listing ???offending??? hardware, rather than
> > automatically covering for it.
>
> Would the following patch work?
>
Yes, this patch also works atleast for me.
> Martin
>
> ---8<---
>
> Subject: [PATCH] scsi: core: Add BLIST_NO_VPD_SIZE for some VDASD
>
> Some storage, such as AIX VDASD (virtual storage) and IBM 2076 (front
> end) do not like commit c92a6b5d6335 ("scsi: core: Query VPD size
> before getting full page").
>
> That commit changed getting SCSI VPD pages so that we now read just
> enough of the page to get the actual page size, then read the whole
> page in a second read. The problem is that the above mentioned
> hardware returns zero for the page size, because of a firmware
> error. In such cases, until the firmware is fixed, this new blacklist
> flag says to revert to the original method of reading the VPD pages,
> i.e. try to read as a whole buffer's worth on the first try.
>
> [mkp: reworked somewhat]
>
> Link: https://lore.kernel.org/r/20220928181350.9948-1-leeman.duncan@xxxxxxxxx
> Fixes: c92a6b5d6335 ("scsi: core: Query VPD size before getting full page")
> Reported-by: Martin Wilck <mwilck@xxxxxxxx>
> Suggested-by: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Lee Duncan <lduncan@xxxxxxxx>
> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
>
> diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
> index 9feb0323bc44..dff1d692e756 100644
> --- a/drivers/scsi/scsi.c
> +++ b/drivers/scsi/scsi.c
> @@ -326,6 +326,9 @@ static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page)
> unsigned char vpd_header[SCSI_VPD_HEADER_SIZE] __aligned(4);
> int result;
>
> + if (sdev->no_vpd_size)
> + return SCSI_DEFAULT_VPD_LEN;
> +
> /*
> * Fetch the VPD page header to find out how big the page
> * is. This is done to prevent problems on legacy devices
> diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
> index c7080454aea9..bc9d280417f6 100644
> --- a/drivers/scsi/scsi_devinfo.c
> +++ b/drivers/scsi/scsi_devinfo.c
> @@ -134,7 +134,7 @@ static struct {
> {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
> {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
> {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
> - {"AIX", "VDASD", NULL, BLIST_TRY_VPD_PAGES},
> + {"AIX", "VDASD", NULL, BLIST_TRY_VPD_PAGES | BLIST_NO_VPD_SIZE},
> {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
> {"BELKIN", "USB 2 HS-CF", "1.95", BLIST_FORCELUN | BLIST_INQUIRY_36},
> {"BROWNIE", "1200U3P", NULL, BLIST_NOREPORTLUN},
> @@ -188,6 +188,7 @@ static struct {
> {"HPE", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
> {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
> {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
> + {"IBM", "2076", NULL, BLIST_NO_VPD_SIZE},
> {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
> {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
> {"IOMEGA", "ZIP", NULL, BLIST_NOTQ | BLIST_NOLUN},
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index f9b18fdc7b3c..6042a5587bc3 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -1055,6 +1055,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
> else if (*bflags & BLIST_SKIP_VPD_PAGES)
> sdev->skip_vpd_pages = 1;
>
> + if (*bflags & BLIST_NO_VPD_SIZE)
> + sdev->no_vpd_size = 1;
> +
> transport_configure_device(&sdev->sdev_gendev);
>
> if (sdev->host->hostt->slave_configure) {
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index 3642b8e3928b..15169d75c251 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -145,6 +145,7 @@ struct scsi_device {
> const char * model; /* ... after scan; point to static string */
> const char * rev; /* ... "nullnullnullnull" before scan */
>
> +#define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
> struct scsi_vpd __rcu *vpd_pg0;
> struct scsi_vpd __rcu *vpd_pg83;
> struct scsi_vpd __rcu *vpd_pg80;
> @@ -215,6 +216,7 @@ struct scsi_device {
> * creation time */
> unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
> unsigned silence_suspend:1; /* Do not print runtime PM related messages */
> + unsigned no_vpd_size:1; /* No VPD size reported in header */
>
> unsigned int queue_stopped; /* request queue is quiesced */
> bool offline_already; /* Device offline message logged */
> diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
> index 5d14adae21c7..6b548dc2c496 100644
> --- a/include/scsi/scsi_devinfo.h
> +++ b/include/scsi/scsi_devinfo.h
> @@ -32,7 +32,8 @@
> #define BLIST_IGN_MEDIA_CHANGE ((__force blist_flags_t)(1ULL << 11))
> /* do not do automatic start on add */
> #define BLIST_NOSTARTONADD ((__force blist_flags_t)(1ULL << 12))
> -#define __BLIST_UNUSED_13 ((__force blist_flags_t)(1ULL << 13))
> +/* do not ask for VPD page size first on some broken targets */
> +#define BLIST_NO_VPD_SIZE ((__force blist_flags_t)(1ULL << 13))
> #define __BLIST_UNUSED_14 ((__force blist_flags_t)(1ULL << 14))
> #define __BLIST_UNUSED_15 ((__force blist_flags_t)(1ULL << 15))
> #define __BLIST_UNUSED_16 ((__force blist_flags_t)(1ULL << 16))
> @@ -74,8 +75,7 @@
> #define __BLIST_HIGH_UNUSED (~(__BLIST_LAST_USED | \
> (__force blist_flags_t) \
> ((__force __u64)__BLIST_LAST_USED - 1ULL)))
> -#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_13 | \
> - __BLIST_UNUSED_14 | \
> +#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_14 | \
> __BLIST_UNUSED_15 | \
> __BLIST_UNUSED_16 | \
> __BLIST_UNUSED_24 | \
--
Thanks and Regards
Srikar Dronamraju
