linux-kernel - Re: [PATCH v1 07/16] ufs: core: mcq: Allocate memory for mcq mode

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Date:   Mon, 3 Oct 2022 13:25:51 -0700
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
CC:     <quic_nguyenb@...cinc.com>, <quic_xiaosenh@...cinc.com>,
        <quic_cang@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_rampraka@...cinc.com>, <quic_richardp@...cinc.com>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <bvanassche@....org>, <avri.altman@....com>, <beanhuo@...ron.com>,
        <martin.petersen@...cle.com>, <linux-scsi@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        "open list" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 07/16] ufs: core: mcq: Allocate memory for mcq mode

On Mon, Sep 26 2022 at 08:46 -0700, Manivannan Sadhasivam wrote:
>On Thu, Sep 22, 2022 at 06:05:14PM -0700, Asutosh Das wrote:
>> To read the bqueuedepth, the device descriptor is fetched
>> in Single Doorbell Mode. This allocated memory may not be
>> enough for MCQ mode because the number of tags supported
>> in MCQ mode may be larger than in SDB mode.
>> Hence, release the memory allocated in SDB mode and allocate
>> memory for MCQ mode operation.
>> Defines the ufs hardware queue and Completion Queue Entry.
>>
>> Co-developed-by: Can Guo <quic_cang@...cinc.com>
>> Signed-off-by: Can Guo <quic_cang@...cinc.com>
>> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
>> ---
>>  drivers/ufs/core/ufs-mcq.c     | 59 ++++++++++++++++++++++++++++++++++++++++--
>>  drivers/ufs/core/ufshcd-priv.h |  1 +
>>  drivers/ufs/core/ufshcd.c      | 39 +++++++++++++++++++++++++---
>>  include/ufs/ufshcd.h           | 19 ++++++++++++++
>>  include/ufs/ufshci.h           | 21 +++++++++++++++
>>  5 files changed, 134 insertions(+), 5 deletions(-)
>>
[...]

>> diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
>> index 6d16beb..f624682 100644
>> --- a/drivers/ufs/core/ufshcd-priv.h
>> +++ b/drivers/ufs/core/ufshcd-priv.h
>> @@ -52,6 +52,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
>>  void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
>>  int ufshcd_mcq_init(struct ufs_hba *hba);
>>  u32 ufshcd_mcq_decide_queue_depth(struct ufs_hba *hba);
>> +int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
>>
>>  #define SD_ASCII_STD true
>>  #define SD_RAW false
>> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
>> index a71b57e..5fc1e5e 100644
>> --- a/drivers/ufs/core/ufshcd.c
>> +++ b/drivers/ufs/core/ufshcd.c
>> @@ -3676,6 +3676,8 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
>>  		goto out;
>>  	}
>>
>> +	if (hba->utmrdl_base_addr)
>> +		goto skip_utmrdl;
>
>Is this change belongs to this patch?
>
Yes.
This change frees and reallocates the descriptor memory by calling
ufshcd_memory_alloc() if MCQ is supported and configured, see
ufshcd_config_mcq().
I will add a comment here.

-asd

>
>-- 
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