linux-kernel - Re: [PATCH v2 00/16] Add cmd descriptor support

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Message-ID: <183d4f5e-e00a-8ef6-a589-f5704bc83d4a@quicinc.com>
Date: Wed, 21 Aug 2024 10:27:46 +0530
From: Md Sadre Alam <quic_mdalam@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>
CC: <vkoul@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <konradybcio@...nel.org>,
        <thara.gopinath@...il.com>, <herbert@...dor.apana.org.au>,
        <davem@...emloft.net>, <gustavoars@...nel.org>,
        <u.kleine-koenig@...gutronix.de>, <kees@...nel.org>,
        <agross@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <quic_srichara@...cinc.com>, <quic_varada@...cinc.com>,
        <quic_utiwari@...cinc.com>
Subject: Re: [PATCH v2 00/16] Add cmd descriptor support



On 8/16/2024 9:31 PM, Bjorn Andersson wrote:
> On Thu, Aug 15, 2024 at 02:27:09PM GMT, Md Sadre Alam wrote:
>> This series of patches will add command descriptor
>> support to read/write crypto engine register via
>> BAM/DMA
>>
>> We need this support because if there is multiple EE's
>> (Execution Environment) accessing the same CE then there
>> will be race condition. To avoid this race condition
>> BAM HW hsving LOC/UNLOCK feature on BAM pipes and this
>> LOCK/UNLOCK will be set via command descriptor only.
>>
>> Since each EE's having their dedicated BAM pipe, BAM allows
>> Locking and Unlocking on BAM pipe. So if one EE's requesting
>> for CE5 access then that EE's first has to LOCK the BAM pipe
>> while setting LOCK bit on command descriptor and then access
>> it. After finishing the request EE's has to UNLOCK the BAM pipe
>> so in this way we race condition will not happen.
>>
>> tested with "tcrypt.ko" and "kcapi" tool.
>>
>> Need help to test these all the patches on msm platform
>>
>> v2:
>>   * Addressed all the comments from v1
> 
> Please describe the actual changes you're making between your versions.
   Sure , will update in next patch.
> 
>>   * Added the dt-binding
>>   * Added locking/unlocking mechanism in bam driver
> 
> Seems to me that this was already part of v1, as patch 6/11?
   Sorry, by mistake I have added this line in v2.
> 
> Regards,
> Bjorn
> 
>>
>> v1:
>>   * https://lore.kernel.org/lkml/20231214114239.2635325-1-quic_mdalam@quicinc.com/
>>   * Initial set of patches for cmd descriptor support
>>
>> Md Sadre Alam (16):
>>    dt-bindings: dma: qcom,bam: Add bam pipe lock
>>    dmaengine: qcom: bam_dma: add bam_pipe_lock dt property
>>    dmaengine: qcom: bam_dma: add LOCK & UNLOCK flag support
>>    crypto: qce - Add support for crypto address read
>>    crypto: qce - Add bam dma support for crypto register r/w
>>    crypto: qce - Convert register r/w for skcipher via BAM/DMA
>>    crypto: qce - Convert register r/w for sha via BAM/DMA
>>    crypto: qce - Convert register r/w for aead via BAM/DMA
>>    crypto: qce - Add LOCK and UNLOCK flag support
>>    crypto: qce - Add support for lock aquire,lock release api.
>>    crypto: qce - Add support for lock/unlock in skcipher
>>    crypto: qce - Add support for lock/unlock in sha
>>    crypto: qce - Add support for lock/unlock in aead
>>    arm64: dts: qcom: ipq9574: enable bam pipe locking/unlocking
>>    arm64: dts: qcom: ipq8074: enable bam pipe locking/unlocking
>>    arm64: dts: qcom: ipq6018: enable bam pipe locking/unlocking
>>
>>   .../devicetree/bindings/dma/qcom,bam-dma.yaml |   8 +
>>   arch/arm64/boot/dts/qcom/ipq6018.dtsi         |   1 +
>>   arch/arm64/boot/dts/qcom/ipq8074.dtsi         |   1 +
>>   arch/arm64/boot/dts/qcom/ipq9574.dtsi         |   1 +
>>   drivers/crypto/qce/aead.c                     |   4 +
>>   drivers/crypto/qce/common.c                   | 142 +++++++----
>>   drivers/crypto/qce/core.c                     |  13 +-
>>   drivers/crypto/qce/core.h                     |  12 +
>>   drivers/crypto/qce/dma.c                      | 232 ++++++++++++++++++
>>   drivers/crypto/qce/dma.h                      |  26 +-
>>   drivers/crypto/qce/sha.c                      |   4 +
>>   drivers/crypto/qce/skcipher.c                 |   4 +
>>   drivers/dma/qcom/bam_dma.c                    |  14 +-
>>   include/linux/dmaengine.h                     |   6 +
>>   14 files changed, 424 insertions(+), 44 deletions(-)
>>
>> -- 
>> 2.34.1
>>