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Date: Mon, 22 Aug 2022 22:25:46 -0500
From: Stephen Boyd <swboyd@...omium.org>
To: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
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: [RESEND v5 6/7] remoteproc: qcom: Add support for memory sandbox
Quoting Srinivasa Rao Mandadapu (2022-08-22 01:22:02)
> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
> index b0a63a0..d01c97e 100644
> --- a/drivers/remoteproc/qcom_q6v5_adsp.c
> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
> @@ -333,6 +336,185 @@ static int adsp_load(struct rproc *rproc, const struct firmware *fw)
> return 0;
> }
>
> +static void adsp_of_unmap_smmu(struct iommu_domain *iommu_dom, const __be32 *prop, int len)
> +{
> + unsigned long iova;
> + unsigned int mem_size;
> + int i;
> +
> + len /= sizeof(__be32);
> + for (i = 0; i < len; i++) {
> + iova = be32_to_cpu(prop[i++]);
> + /* Skip Physical address*/
> + i++;
> + mem_size = be32_to_cpu(prop[i++]);
> + iommu_unmap(iommu_dom, iova, mem_size);
> + }
> +}
> +
> +static void adsp_rproc_unmap_smmu(struct rproc *rproc, int len)
> +{
> + struct fw_rsc_devmem *rsc_fw;
> + struct fw_rsc_hdr *hdr;
> + int offset;
> + int i;
> +
> + for (i = 0; i < len; i++) {
> + offset = rproc->table_ptr->offset[i];
> + hdr = (void *)rproc->table_ptr + offset;
> + rsc_fw = (struct fw_rsc_devmem *)hdr + sizeof(*hdr);
> +
> + iommu_unmap(rproc->domain, rsc_fw->da, rsc_fw->len);
> + }
> +}
> +
> +static void adsp_unmap_smmu(struct rproc *rproc)
> +{
> + struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> + const __be32 *prop;
> + unsigned int len;
> +
> + iommu_unmap(adsp->iommu_dom, adsp->mem_phys, adsp->mem_size);
> +
> + prop = of_get_property(adsp->dev->of_node, "qcom,adsp-memory-regions", &len);
> + if (prop) {
> + adsp_of_unmap_smmu(adsp->iommu_dom, prop, len);
> + } else {
> + if (rproc->table_ptr)
> + adsp_rproc_unmap_smmu(rproc, rproc->table_ptr->num);
> + }
> +
> + iommu_domain_free(adsp->iommu_dom);
> +}
> +
> +static int adsp_of_map_smmu(struct iommu_domain *iommu_dom, const __be32 *prop, int len)
> +{
> + unsigned long mem_phys;
> + unsigned long iova;
> + unsigned int mem_size;
> + unsigned int flag;
> + int access_level;
> + int ret;
> + int i;
> +
> + len /= sizeof(__be32);
> + for (i = 0; i < len; i++) {
> + iova = be32_to_cpu(prop[i++]);
> + mem_phys = be32_to_cpu(prop[i++]);
> + mem_size = be32_to_cpu(prop[i++]);
> + access_level = be32_to_cpu(prop[i]);
> +
> + if (access_level)
> + flag = IOMMU_READ | IOMMU_WRITE;
> + else
> + flag = IOMMU_READ;
> +
> + ret = iommu_map(iommu_dom, iova, mem_phys, mem_size, flag);
> + if (ret) {
> + pr_err("failed to map addr = %p mem_size = %x\n", &(mem_phys), mem_size);
Why can't this be dev_err()?
> + goto of_smmu_unmap;
> + }
> + }
> + return 0;
> +of_smmu_unmap:
> + adsp_of_unmap_smmu(iommu_dom, prop, i);
> + return ret;
> +}
> +
> +static int adsp_rproc_map_smmu(struct rproc *rproc, int len)
> +{
> + struct fw_rsc_devmem *rsc_fw;
const?
> + struct fw_rsc_hdr *hdr;
const?
> + int offset;
> + int ret;
> + int i;
> +
> + if (!rproc->table_ptr)
> + return 0;
> +
> + for (i = 0; i < rproc->table_ptr->num; i++) {
> + offset = rproc->table_ptr->offset[i];
> + hdr = (void *)rproc->table_ptr + offset;
> + rsc_fw = (struct fw_rsc_devmem *)hdr + sizeof(*hdr);
> +
> + ret = iommu_map(rproc->domain, rsc_fw->da, rsc_fw->pa,
> + rsc_fw->len, rsc_fw->flags);
> + if (ret) {
> + pr_err("failed to map addr = %x mem_size = %x\n", rsc_fw->pa, rsc_fw->len);
Why can't this be dev_err()?
> + goto rproc_smmu_unmap;
> + }
> + }
> +
> + return 0;
> +
> +rproc_smmu_unmap:
> + adsp_rproc_unmap_smmu(rproc, i);
Does i need to be incremented? And/or unmap should be done in reverse.
> + return ret;
> +}
> +
> +static int adsp_map_smmu(struct qcom_adsp *adsp, struct rproc *rproc)
> +{
> + struct of_phandle_args args;
> + const __be32 *prop;
> + long long sid;
> + unsigned int len;
> + int ret;
> +
> + ret = of_parse_phandle_with_args(adsp->dev->of_node, "iommus", "#iommu-cells", 0, &args);
> + if (ret < 0)
> + sid = -1;
Is it a good idea to set the sid to -1? Does that mean all stream IDs?
> + else
> + sid = args.args[0] & SID_MASK_DEFAULT;
> +
> + adsp->iommu_dom = iommu_domain_alloc(adsp->dev->bus);
> + if (!adsp->iommu_dom) {
> + dev_err(adsp->dev, "failed to allocate iommu domain\n");
> + ret = -ENOMEM;
> + goto domain_free;
> + }
> +
> + ret = iommu_attach_device(adsp->iommu_dom, adsp->dev);
> + if (ret) {
> + dev_err(adsp->dev, "could not attach device ret = %d\n", ret);
> + ret = -EBUSY;
Why do we overwrite the error value?
> + goto detach_device;
> + }
> +
> + /* Add SID configuration for ADSP Firmware to SMMU */
> + adsp->mem_phys = adsp->mem_phys | (sid << 32);
> +
> + ret = iommu_map(adsp->iommu_dom, adsp->mem_phys, adsp->mem_phys,
> + adsp->mem_size, IOMMU_READ | IOMMU_WRITE);
> + if (ret) {
> + dev_err(adsp->dev, "Unable to map ADSP Physical Memory\n");
> + goto sid_unmap;
> + }
> +
> + prop = of_get_property(adsp->dev->of_node, "qcom,adsp-memory-regions", &len);
I find it odd that we're encoding virtual addresses (iovas) into
devicetree. Presumably the physical address needs to be in DT as a
carveout, but after that I would think we're free to allocate the
segments from the carveout however we see fit and then program that into
the SMMU. Maybe DT can be a suggestion, but otherwise can it be ignored?
> + if (prop) {
> + ret = adsp_of_map_smmu(adsp->iommu_dom, prop, len);
> + if (ret) {
> + dev_err(adsp->dev, "Unable to map memory regions accessed by ADSP\n");
> + goto sid_unmap;
> + }
> + } else {
> + ret = adsp_rproc_map_smmu(rproc, len);
> + if (ret) {
> + dev_err(adsp->dev, "Unable to map memory regions accessed by ADSP\n");
Maybe this should be a different string in case it is confused with the
above print of the same string.
> + goto sid_unmap;
> + }
> + }
> + return 0;
> +
> +sid_unmap:
> + iommu_unmap(adsp->iommu_dom, adsp->mem_phys, adsp->mem_size);
> +detach_device:
> + iommu_domain_free(adsp->iommu_dom);
> +domain_free:
> + return ret;
> +}
> +
> +
> static int adsp_start(struct rproc *rproc)
> {
> struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> @@ -343,9 +525,16 @@ static int adsp_start(struct rproc *rproc)
> if (ret)
> return ret;
>
> + if (adsp->adsp_sandbox_needed) {
> + ret = adsp_map_smmu(adsp, rproc);
> + if (ret) {
> + dev_err(adsp->dev, "ADSP smmu mapping failed\n");
> + goto disable_irqs;
> + }
> + }
Newline here please.
> 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);
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