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

[Srinivasa Rao Mandadapu <quic_srivasam@xxxxxxxxxxx>]

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