linux-kernel - RE: [PATCH V15 2/2] scsi: ufs: Add configfs support for UFS provisioning

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Date:   Wed, 17 Oct 2018 08:33:02 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Sayali Lokhande <sayalil@...eaurora.org>,
        "subhashj@...eaurora.org" <subhashj@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "vivek.gautam@...eaurora.org" <vivek.gautam@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "vinholikatti@...il.com" <vinholikatti@...il.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "evgreen@...omium.org" <evgreen@...omium.org>,
        "riteshh@...eaurora.org" <riteshh@...eaurora.org>
CC:     "stummala@...eaurora.org" <stummala@...eaurora.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "jlbec@...lplan.org" <jlbec@...lplan.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V15 2/2] scsi: ufs: Add configfs support for UFS
 provisioning

Hello Bean,

> >Usage:
> >1) To read current configuration descriptor with index X
> >   (where index X can be 0/1/2/3) :
> >   cat /config/<device_name>/ufs_config_desc_X
> >
> >2) To write configuration descriptor with index X :
> >   echo <config_desc_buf> > /config/<device_name>/ufs_config_desc_X
> >
> >
> I tested on my platform and got these error:
> 
> cat /sys/kernel/config/ff3b0000.ufs/ufs_config_desc_0
> 0x90 0x1 0x0 0x1 0x0 0x1 0x7f 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 
> 0x1 0x1 0x0 0x3 0x0 0x0 0x0 0x2 0x1 0xc 0x2 0x0 0x0 0x0 0x0 0x0
> 0x1 0x2 0x0 0x3 0x0 0x0 0x0 0x2 0x1 0xc 0x2 0x0 0x0 0x0 0x0 0x0
> 0x1 0x0 0x0 0x3 0x0 0x0 0x0 0x4 0x1 0xc 0x2 0x0 0x0 0x0 0x0 0x0
> 0x1 0x0 0x0  0x0 0x0 0x0 0x1d 0xc7 0x1 0xc 0x2 0x0 0x0 0x0 0x0 0x0
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0xc 0x0 0x0 0x0 0x0 0x0 0x0
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0xc 0x0 0x0 0x0 0x0 0x0 0x0
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0xc 0x0 0x0 0x0 0x0 0x0 0x0
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0xc 0x0 0x0 0x0 0x0 0x0 0x0
> 
> cat /sys/kernel/config/ff3b0000.ufs/ufs_config_desc_1
> [   63.631734] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 1, err = 252
> [   63.643059] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 1, err = 252
> [   63.653602] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 1, err = 252
This actually does not imply an error, just that your device is currently configured
With 4 luns (2 of them are bootluns), as config_desc_0 shows.
config_desc_0 also indicate that there are no other config descriptors - 
the 3rd byte of its header is 0x0.

It would be interesting to test however, a write operation with index 0x1 to this device.
The current code is trying to override the config descriptor with the new configuration - 
That is, it reads it first, and then re-writes it.
I would expect that this will fail if the you are trying to read descriptor with an index that does not exist.

Thanks,
Avri



> cat /sys/kernel/config/ff3b0000.ufs/ufs_config_desc_2
> [   77.946097] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 2, err = 252
> [   77.957212] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 2, err = 252
> [   77.968534] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 2, err = 252
> cat /sys/kernel/config/ff3b0000.ufs/ufs_config_desc_3
> [   82.237656] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 3, err = 252
> [   82.248374] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 3, err = 252
> [   82.259117] ufshcd-hisi ff3b0000.ufs: __ufshcd_query_descriptor: opcode
> 0x01 for idn 1 failed, index 3, err = 252