Re: [PATCH v13 05/11] remoteproc: mediatek: Introduce cluster on single-core SCP

From: TingHan Shen (沈廷翰)
Date: Wed Jun 14 2023 - 05:03:45 EST

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Hi Mathieu,

On Mon, 2023-06-12 at 11:25 -0600, Mathieu Poirier wrote:
> On Wed, Jun 07, 2023 at 03:22:16PM +0800, Tinghan Shen wrote:
> > This is the preliminary step for probing multi-core SCP.
> > The initialization procedure for remoteproc is similar for both
> > single-core and multi-core architectures and is reusing to avoid
> > redundant code.
> >
> > Rewrite the probing flow of single-core SCP to adapt with the 'cluster'
> > concept needed by probing the multi-core SCP. The main differences
> > are,
> > - the SCP core object(s) is maintained at the cluster list instead of at
> > the platofmr device driver data property.
> > - save the cluster information at the platofmr device driver data property.
> > - In order to keep the compatibility of exported SCP APIs which getting
> > the SCP core object by SCP node phandle, move the SCP core object
> > pointers to the platform device platform data property.
> >
> > The registers of config and l1tcm are shared for multi-core
> > SCP. Reuse the mapped addresses for all cores.
> >
> > Signed-off-by: Tinghan Shen <tinghan.shen@xxxxxxxxxxxx>
> > ---
> > drivers/remoteproc/mtk_common.h | 2 +
> > drivers/remoteproc/mtk_scp.c | 151 +++++++++++++++++++++++---------
> > 2 files changed, 112 insertions(+), 41 deletions(-)
> >
> > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> > index c0905aec3b4b..56395e8664cb 100644
> > --- a/drivers/remoteproc/mtk_common.h
> > +++ b/drivers/remoteproc/mtk_common.h
> > @@ -128,6 +128,8 @@ struct mtk_scp {
> > size_t dram_size;
> >
> > struct rproc_subdev *rpmsg_subdev;
> > +
> > + struct list_head elem;
> > };
> >
> > /**
> > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> > index d66822dad943..c8fc6b46f82b 100644
> > --- a/drivers/remoteproc/mtk_scp.c
> > +++ b/drivers/remoteproc/mtk_scp.c
> > @@ -23,6 +23,14 @@
> > #define MAX_CODE_SIZE 0x500000
> > #define SECTION_NAME_IPI_BUFFER ".ipi_buffer"
> >
> > +struct mtk_scp_of_cluster {
> > + void __iomem *reg_base;
> > + void __iomem *l1tcm_base;
> > + size_t l1tcm_size;
> > + phys_addr_t l1tcm_phys;
> > + struct list_head mtk_scp_list;
> > +};
> > +
> > /**
> > * scp_get() - get a reference to SCP.
> > *
> > @@ -51,7 +59,7 @@ struct mtk_scp *scp_get(struct platform_device *pdev)
> > return NULL;
> > }
> >
> > - return platform_get_drvdata(scp_pdev);
> > + return *(struct mtk_scp **)dev_get_platdata(&scp_pdev->dev);
> > }
> > EXPORT_SYMBOL_GPL(scp_get);
> >
> > @@ -810,14 +818,14 @@ static void scp_unmap_memory_region(struct mtk_scp *scp)
> > static int scp_register_ipi(struct platform_device *pdev, u32 id,
> > ipi_handler_t handler, void *priv)
> > {
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > + struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
> >
> > return scp_ipi_register(scp, id, handler, priv);
> > }
> >
> > static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
> > {
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > + struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
> >
> > scp_ipi_unregister(scp, id);
> > }
> > @@ -825,7 +833,7 @@ static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
> > static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
> > unsigned int len, unsigned int wait)
> > {
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > + struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
> >
> > return scp_ipi_send(scp, id, buf, len, wait);
> > }
> > @@ -855,7 +863,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
> > }
> > }
> >
> > -static int scp_probe(struct platform_device *pdev)
> > +static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
> > + struct mtk_scp_of_cluster *scp_cluster)
> > {
> > struct device *dev = &pdev->dev;
> > struct device_node *np = dev->of_node;
> > @@ -867,52 +876,42 @@ static int scp_probe(struct platform_device *pdev)
> >
> > ret = rproc_of_parse_firmware(dev, 0, &fw_name);
> > if (ret < 0 && ret != -EINVAL)
> > - return ret;
> > + return ERR_PTR(ret);
> >
> > rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
> > - if (!rproc)
> > - return dev_err_probe(dev, -ENOMEM, "unable to allocate remoteproc\n");
> > + if (!rproc) {
> > + dev_err(dev, "unable to allocate remoteproc\n");
> > + return ERR_PTR(-ENOMEM);
> > + }
> >
> > scp = rproc->priv;
> > scp->rproc = rproc;
> > scp->dev = dev;
> > scp->data = of_device_get_match_data(dev);
> > - platform_set_drvdata(pdev, scp);
> > + platform_device_add_data(pdev, &scp, sizeof(scp));
> > +
> > + scp->reg_base = scp_cluster->reg_base;
> > + scp->l1tcm_base = scp_cluster->l1tcm_base;
> > + scp->l1tcm_size = scp_cluster->l1tcm_size;
> > + scp->l1tcm_phys = scp_cluster->l1tcm_phys;
> >
> > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
> > scp->sram_base = devm_ioremap_resource(dev, res);
> > - if (IS_ERR(scp->sram_base))
> > - return dev_err_probe(dev, PTR_ERR(scp->sram_base),
> > - "Failed to parse and map sram memory\n");
> > + if (IS_ERR(scp->sram_base)) {
> > + dev_err(dev, "Failed to parse and map sram memory\n");
> > + return ERR_PTR(PTR_ERR(scp->sram_base));
>
> Can you spot what is wrong here?

After look around of the header, I thought that I should use the ERR_CAST instead.
It fix the sparse warning and prevent the weired double type casting.
If this is ok, I will fix it this way in the next version.

Best regards,
TingHan

>
> > + }
> >
> > scp->sram_size = resource_size(res);
> > scp->sram_phys = res->start;
> >
> > - /* l1tcm is an optional memory region */
> > - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
> > - scp->l1tcm_base = devm_ioremap_resource(dev, res);
> > - if (IS_ERR(scp->l1tcm_base)) {
> > - ret = PTR_ERR(scp->l1tcm_base);
> > - if (ret != -EINVAL) {
> > - return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
> > - }
> > - } else {
> > - scp->l1tcm_size = resource_size(res);
> > - scp->l1tcm_phys = res->start;
> > - }
> > -
> > - scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
> > - if (IS_ERR(scp->reg_base))
> > - return dev_err_probe(dev, PTR_ERR(scp->reg_base),
> > - "Failed to parse and map cfg memory\n");
> > -
> > ret = scp->data->scp_clk_get(scp);
> > if (ret)
> > - return ret;
> > + return ERR_PTR(ret);
> >
> > ret = scp_map_memory_region(scp);
> > if (ret)
> > - return ret;
> > + return ERR_PTR(ret);
> >
> > mutex_init(&scp->send_lock);
> > for (i = 0; i < SCP_IPI_MAX; i++)
> > @@ -939,11 +938,7 @@ static int scp_probe(struct platform_device *pdev)
> > goto remove_subdev;
> > }
> >
> > - ret = rproc_add(rproc);
> > - if (ret)
> > - goto remove_subdev;
> > -
> > - return 0;
> > + return scp;
> >
> > remove_subdev:
> > scp_remove_rpmsg_subdev(scp);
> > @@ -954,15 +949,13 @@ static int scp_probe(struct platform_device *pdev)
> > mutex_destroy(&scp->ipi_desc[i].lock);
> > mutex_destroy(&scp->send_lock);
> >
> > - return ret;
> > + return ERR_PTR(ret);
> > }
> >
> > -static void scp_remove(struct platform_device *pdev)
> > +static void scp_free(struct mtk_scp *scp)
> > {
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > int i;
> >
> > - rproc_del(scp->rproc);
> > scp_remove_rpmsg_subdev(scp);
> > scp_ipi_unregister(scp, SCP_IPI_INIT);
> > scp_unmap_memory_region(scp);
> > @@ -971,6 +964,82 @@ static void scp_remove(struct platform_device *pdev)
> > mutex_destroy(&scp->send_lock);
> > }
> >
> > +static int scp_cluster_init(struct platform_device *pdev)
> > +{
> > + struct mtk_scp_of_cluster *scp_cluster = platform_get_drvdata(pdev);
> > + struct list_head *cluster = &scp_cluster->mtk_scp_list;
> > + struct mtk_scp *scp;
> > + int ret;
> > +
> > + scp = scp_rproc_init(pdev, scp_cluster);
> > + if (IS_ERR(scp))
> > + return PTR_ERR(scp);
> > +
> > + ret = rproc_add(scp->rproc);
> > + if (ret) {
> > + dev_err(dev, "Failed to add rproc\n");
> > + scp_free(scp);
> > + return ret;
> > + }
> > +
> > + list_add_tail(&scp->elem, cluster);
> > +
> > + return 0;
> > +}
> > +
> > +static int scp_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct mtk_scp_of_cluster *scp_cluster;
> > + struct resource *res;
> > + int ret;
> > +
> > + scp_cluster = devm_kzalloc(dev, sizeof(*scp_cluster), GFP_KERNEL);
> > + if (!scp_cluster)
> > + return -ENOMEM;
> > +
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
> > + scp_cluster->reg_base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(scp_cluster->reg_base))
> > + return dev_err_probe(dev, PTR_ERR(scp_cluster->reg_base),
> > + "Failed to parse and map cfg memory\n");
> > +
> > + /* l1tcm is an optional memory region */
> > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
> > + scp_cluster->l1tcm_base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(scp_cluster->l1tcm_base)) {
> > + ret = PTR_ERR(scp_cluster->l1tcm_base);
> > + if (ret != -EINVAL)
> > + return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
> > +
> > + scp_cluster->l1tcm_base = NULL;
> > + } else {
> > + scp_cluster->l1tcm_size = resource_size(res);
> > + scp_cluster->l1tcm_phys = res->start;
> > + }
> > +
> > + INIT_LIST_HEAD(&scp_cluster->mtk_scp_list);
> > + platform_set_drvdata(pdev, scp_cluster);
> > +
> > + ret = scp_cluster_init(pdev);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static void scp_remove(struct platform_device *pdev)
> > +{
> > + struct mtk_scp_of_cluster *scp_cluster = platform_get_drvdata(pdev);
> > + struct mtk_scp *scp, *temp;
> > +
> > + list_for_each_entry_safe_reverse(scp, temp, &scp_cluster->mtk_scp_list, elem) {
> > + list_del(&scp->elem);
> > + rproc_del(scp->rproc);
> > + scp_free(scp);
> > + }
> > +}
> > +
> > static const struct mtk_scp_of_data mt8183_of_data = {
> > .scp_clk_get = mt8183_scp_clk_get,
> > .scp_before_load = mt8183_scp_before_load,
> > --
> > 2.18.0

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