linux-kernel - Re: [PATCH v6 7/8] remoteproc: qcom: Add support for memory sandbox

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Message-ID: <e9b0187b-f4b1-5aef-862e-7bc2bbab4e1a@quicinc.com>
Date:   Mon, 19 Sep 2022 19:29:09 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>, <agross@...nel.org>,
        <bgoswami@...cinc.com>, <bjorn.andersson@...aro.org>,
        <broonie@...nel.org>, <devicetree@...r.kernel.org>,
        <judyhsiao@...omium.org>, <lgirdwood@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <perex@...ex.cz>,
        <quic_plai@...cinc.com>, <quic_rohkumar@...cinc.com>,
        <robh+dt@...nel.org>, <srinivas.kandagatla@...aro.org>,
        <tiwai@...e.com>
Subject: Re: [PATCH v6 7/8] remoteproc: qcom: Add support for memory sandbox


On 9/12/2022 4:31 AM, Stephen Boyd wrote:
Thanks for Your time Stephen!!!
> Quoting Srinivasa Rao Mandadapu (2022-09-08 06:23:41)
>> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
>> index ccb5592..e55d593 100644
>> --- a/drivers/remoteproc/qcom_q6v5_adsp.c
>> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
>> @@ -9,6 +9,7 @@
>>   #include <linux/firmware.h>
>>   #include <linux/interrupt.h>
>>   #include <linux/io.h>
>> +#include <linux/iommu.h>
>>   #include <linux/iopoll.h>
>>   #include <linux/kernel.h>
>>   #include <linux/mfd/syscon.h>
>> @@ -48,6 +49,8 @@
>>   #define LPASS_PWR_ON_REG               0x10
>>   #define LPASS_HALTREQ_REG              0x0
>>
>> +#define SID_MASK_DEFAULT        0xF
>> +
>>   #define QDSP6SS_XO_CBCR                0x38
>>   #define QDSP6SS_CORE_CBCR      0x20
>>   #define QDSP6SS_SLEEP_CBCR     0x3c
>> @@ -333,6 +336,42 @@ static int adsp_load(struct rproc *rproc, const struct firmware *fw)
>>          return 0;
>>   }
>>
>> +static void adsp_unmap_smmu(struct rproc *rproc)
>> +{
>> +       struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> Drop the cast, it's unnecessary.
Okay. Will drop casting.
>
>> +
>> +       iommu_unmap(rproc->domain, adsp->mem_phys, adsp->mem_size);
>> +}
>> +
> [..]
>> @@ -343,9 +382,17 @@ static int adsp_start(struct rproc *rproc)
>>          if (ret)
>>                  return ret;
>>
>> +       if (adsp->has_iommu) {
>> +               ret = adsp_map_smmu(adsp, rproc);
>> +               if (ret) {
>> +                       dev_err(adsp->dev, "ADSP smmu mapping failed\n");
>> +                       goto disable_irqs;
>> +               }
>> +       }
>> +
>>          ret = clk_prepare_enable(adsp->xo);
>>          if (ret)
>> -               goto disable_irqs;
>> +               goto adsp_smmu_unmap;
>>
>>          ret = qcom_rproc_pds_enable(adsp, adsp->proxy_pds,
>>                                      adsp->proxy_pd_count);
>> @@ -401,6 +448,9 @@ static int adsp_start(struct rproc *rproc)
>>          qcom_rproc_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
>>   disable_xo_clk:
>>          clk_disable_unprepare(adsp->xo);
>> +adsp_smmu_unmap:
>> +       if (adsp->has_iommu)
>> +               adsp_unmap_smmu(rproc);
> Why not pass adsp directly to adsp_unmap_smmu()? And even better would
> be to make it a no-op when adsp->has_iommu is false, so that the code
> reads straight-line otherwise.
Okay. Will update accordingly.
>
>>   disable_irqs:
>>          qcom_q6v5_unprepare(&adsp->q6v5);
>>
>> @@ -429,6 +479,9 @@ static int adsp_stop(struct rproc *rproc)
>>          if (ret)
>>                  dev_err(adsp->dev, "failed to shutdown: %d\n", ret);
>>
>> +       if (adsp->has_iommu)
>> +               adsp_unmap_smmu(rproc);
>> +
>>          handover = qcom_q6v5_unprepare(&adsp->q6v5);
>>          if (handover)
>>                  qcom_adsp_pil_handover(&adsp->q6v5);
>> --
>> 2.7.4
>>