From: "Linux regression tracking (Thorsten Leemhuis)" <regressions@leemhuis.info>
To: Lee Duncan <leeman.duncan@gmail.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Lee Duncan <lduncan@suse.com>, Martin Wilck <mwilck@suse.com>,
Hannes Reinecke <hare@suse.de>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Linux kernel regressions list <regressions@lists.linux.dev>
Subject: Re: [PATCH] scsi: core: Add BLIST_NO_ASK_VPD_SIZE for some VDASD
Date: Fri, 3 Mar 2023 10:02:26 +0100 [thread overview]
Message-ID: <88927435-ae58-c24b-e7b7-b675985de433@leemhuis.info> (raw)
In-Reply-To: <20220928181350.9948-1-leeman.duncan@gmail.com>
Hi, this is your Linux kernel regression tracker.
On 28.09.22 20:13, Lee Duncan wrote:
> From: Lee Duncan <lduncan@suse.com>
>
> Some storage, such as AIX VDASD (virtual storage) and IBM 2076
> (front end) do not like the recent commit:
>
> 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 black 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.
As this is a fix for a regression (one that Srikar Dronamraju recently
ran into as well and bisected again :-/ ), please allow me to ask:
James, Martin, what is needed to get this or some other solution for the
regression finally mainlined?
FWIW, the thread afaics accumulated three Reviewed-by an one Tested-by
in the meantime.
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.
#regzbot poke
> Fixes: c92a6b5d6335 ("scsi: core: Query VPD size before getting full page")
> Reported-by: Martin Wilck <mwilck@suse.com>
> Suggested-by: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Lee Duncan <lduncan@suse.com>
> ---
> drivers/scsi/scsi.c | 14 +++++++++++---
> drivers/scsi/scsi_devinfo.c | 3 ++-
> drivers/scsi/scsi_scan.c | 3 +++
> include/scsi/scsi_device.h | 2 ++
> include/scsi/scsi_devinfo.h | 6 +++---
> 5 files changed, 21 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
> index c59eac7a32f2..f2db4b846190 100644
> --- a/drivers/scsi/scsi.c
> +++ b/drivers/scsi/scsi.c
> @@ -321,11 +321,19 @@ static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer,
> return get_unaligned_be16(&buffer[2]) + 4;
> }
>
> -static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page)
> +static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page, int buf_len)
> {
> unsigned char vpd_header[SCSI_VPD_HEADER_SIZE] __aligned(4);
> int result;
>
> + /*
> + * if this hardware is blacklisted then don't bother asking
> + * the page size, since it will repy with zero -- just assume it
> + * is the buffer size
> + */
> + if (sdev->no_ask_vpd_sz_first)
> + return buf_len;
> +
> /*
> * Fetch the VPD page header to find out how big the page
> * is. This is done to prevent problems on legacy devices
> @@ -367,7 +375,7 @@ int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf,
> if (!scsi_device_supports_vpd(sdev))
> return -EINVAL;
>
> - vpd_len = scsi_get_vpd_size(sdev, page);
> + vpd_len = scsi_get_vpd_size(sdev, page, buf_len);
> if (vpd_len <= 0)
> return -EINVAL;
>
> @@ -402,7 +410,7 @@ static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page)
> struct scsi_vpd *vpd_buf;
> int vpd_len, result;
>
> - vpd_len = scsi_get_vpd_size(sdev, page);
> + vpd_len = scsi_get_vpd_size(sdev, page, SCSI_VPD_PG_LEN);
> if (vpd_len <= 0)
> return NULL;
>
> diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
> index c7080454aea9..d2b2e841e570 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_ASK_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_ASK_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 5d27f5196de6..b67743e32089 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -1056,6 +1056,9 @@ 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_ASK_VPD_SIZE)
> + sdev->no_ask_vpd_sz_first = 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 2493bd65351a..5d15784ccefc 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_VPD_PG_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;
> @@ -214,6 +215,7 @@ 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_ask_vpd_sz_first:1; /* Do not ask for VPD size first */
>
> 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..ec12dbaff0e8 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_ASK_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 | \
next prev parent reply other threads:[~2023-03-03 9:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 18:13 [PATCH] scsi: core: Add BLIST_NO_ASK_VPD_SIZE for some VDASD Lee Duncan
2022-09-29 10:42 ` Martin Wilck
2022-10-02 21:16 ` Bart Van Assche
2022-10-02 22:21 ` Lee Duncan
2022-10-04 6:00 ` Hannes Reinecke
2022-11-08 2:50 ` Martin K. Petersen
2022-11-08 6:57 ` Hannes Reinecke
2022-11-21 14:53 ` Martin Wilck
2022-10-03 16:32 ` Bart Van Assche
2023-02-20 11:13 ` Srikar Dronamraju
2023-02-27 7:02 ` Hannes Reinecke
2023-03-03 9:02 ` Linux regression tracking (Thorsten Leemhuis) [this message]
2023-03-03 18:54 ` Lee Duncan
2023-03-06 22:14 ` Martin K. Petersen
2023-03-07 2:54 ` Martin K. Petersen
2023-03-07 10:32 ` Srikar Dronamraju
2023-03-07 16:33 ` Lee Duncan
2023-03-07 23:40 ` Martin K. Petersen
2023-03-08 18:41 ` Lee Duncan
2023-03-10 3:17 ` Martin K. Petersen
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