On Tue, Sep 27, 2022 at 02:48:02AM +0000, Peng Fan wrote:
> Hi Mathieu,
>
> Thanks for reviewing this patchset.
> > Subject: Re: [PATCH V5 3/6] remoteproc: imx_rproc: support attaching to
> > i.MX8QXP M4
> >
> > On Wed, Aug 24, 2022 at 09:10:20AM +0800, Peng Fan (OSS) wrote:
> > > From: Peng Fan <peng.fan@xxxxxxx>
> > >
> > > When M4 is kicked by SCFW, M4 runs in its own hardware partition,
> > > Linux could only do IPC with M4, it could not start, stop, update image.
> > >
> > > We disable recovery reboot when M4 is managed by SCFW, because
> > > remoteproc core still not support M4 auto-recovery without loading
> > > image.
> > >
> > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> > > ---
> > > drivers/remoteproc/imx_rproc.c | 108
> > > ++++++++++++++++++++++++++++++++-
> > > 1 file changed, 107 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/remoteproc/imx_rproc.c
> > > b/drivers/remoteproc/imx_rproc.c index 7cc4fd207e2d..bcba74e90020
> > > 100644
> > > --- a/drivers/remoteproc/imx_rproc.c
> > > +++ b/drivers/remoteproc/imx_rproc.c
> > > @@ -6,6 +6,7 @@
> > > #include <linux/arm-smccc.h>
> > > #include <linux/clk.h>
> > > #include <linux/err.h>
> > > +#include <linux/firmware/imx/sci.h>
> > > #include <linux/interrupt.h>
> > > #include <linux/kernel.h>
> > > #include <linux/mailbox_client.h>
> > > @@ -59,6 +60,8 @@
> > > #define IMX_SIP_RPROC_STARTED 0x01
> > > #define IMX_SIP_RPROC_STOP 0x02
> > >
> > > +#define IMX_SC_IRQ_GROUP_REBOOTED 5
> > > +
> > > /**
> > > * struct imx_rproc_mem - slim internal memory structure
> > > * @cpu_addr: MPU virtual address of the memory region @@ -89,6
> > > +92,10 @@ struct imx_rproc {
> > > struct work_struct rproc_work;
> > > struct workqueue_struct *workqueue;
> > > void __iomem *rsc_table;
> > > + struct imx_sc_ipc *ipc_handle;
> > > + struct notifier_block rproc_nb;
> > > + u32 rproc_pt; /* partition id */
> > > + u32 rsrc_id; /* resource id */
> > > };
> > >
> > > static const struct imx_rproc_att imx_rproc_att_imx93[] = { @@ -117,6
> > > +124,18 @@ static const struct imx_rproc_att imx_rproc_att_imx93[] = {
> > > { 0xD0000000, 0xa0000000, 0x10000000, 0 }, };
> > >
> > > +static const struct imx_rproc_att imx_rproc_att_imx8qxp[] = {
> > > + { 0x08000000, 0x08000000, 0x10000000, 0 },
> > > + /* TCML/U */
> > > + { 0x1FFE0000, 0x34FE0000, 0x00040000, ATT_OWN | ATT_IOMEM },
> > > + /* OCRAM(Low 96KB) */
> > > + { 0x21000000, 0x00100000, 0x00018000, 0 },
> > > + /* OCRAM */
> > > + { 0x21100000, 0x00100000, 0x00040000, 0 },
> > > + /* DDR (Data) */
> > > + { 0x80000000, 0x80000000, 0x60000000, 0 }, };
> > > +
> > > static const struct imx_rproc_att imx_rproc_att_imx8mn[] = {
> > > /* dev addr , sys addr , size , flags */
> > > /* ITCM */
> > > @@ -255,6 +274,12 @@ static const struct imx_rproc_dcfg
> > imx_rproc_cfg_imx8mq = {
> > > .method = IMX_RPROC_MMIO,
> > > };
> > >
> > > +static const struct imx_rproc_dcfg imx_rproc_cfg_imx8qxp = {
> > > + .att = imx_rproc_att_imx8qxp,
> > > + .att_size = ARRAY_SIZE(imx_rproc_att_imx8qxp),
> > > + .method = IMX_RPROC_SCU_API,
> > > +};
> > > +
> > > static const struct imx_rproc_dcfg imx_rproc_cfg_imx8ulp = {
> > > .att = imx_rproc_att_imx8ulp,
> > > .att_size = ARRAY_SIZE(imx_rproc_att_imx8ulp),
> > > @@ -680,6 +705,37 @@ static void imx_rproc_free_mbox(struct rproc
> > *rproc)
> > > mbox_free_channel(priv->rx_ch);
> > > }
> > >
> > > +static void imx_rproc_put_scu(struct rproc *rproc) {
> > > + struct imx_rproc *priv = rproc->priv;
> > > + const struct imx_rproc_dcfg *dcfg = priv->dcfg;
> > > +
> > > + if (dcfg->method != IMX_RPROC_SCU_API)
> > > + return;
> > > +
> > > + if (!imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id))
> > > + return;
> > > +
> > > + imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_REBOOTED,
> > BIT(priv->rproc_pt), false);
> > > + imx_scu_irq_unregister_notifier(&priv->rproc_nb);
> > > +}
> > > +
> > > +static int imx_rproc_partition_notify(struct notifier_block *nb,
> > > + unsigned long event, void *group) {
> > > + struct imx_rproc *priv = container_of(nb, struct imx_rproc,
> > > +rproc_nb);
> > > +
> > > + /* Ignore other irqs */
> > > + if (!((event & BIT(priv->rproc_pt)) && (*(u8 *)group ==
> > IMX_SC_IRQ_GROUP_REBOOTED)))
> > > + return 0;
> > > +
> > > + rproc_report_crash(priv->rproc, RPROC_WATCHDOG);
> > > +
> > > + pr_info("Partition%d reset!\n", priv->rproc_pt);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static int imx_rproc_detect_mode(struct imx_rproc *priv) {
> > > struct regmap_config config = { .name = "imx-rproc" }; @@ -689,6
> > > +745,7 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
> > > struct arm_smccc_res res;
> > > int ret;
> > > u32 val;
> > > + u8 pt;
> > >
> > > switch (dcfg->method) {
> > > case IMX_RPROC_NONE:
> > > @@ -699,6 +756,51 @@ static int imx_rproc_detect_mode(struct
> > imx_rproc *priv)
> > > if (res.a0)
> > > priv->rproc->state = RPROC_DETACHED;
> > > return 0;
> > > + case IMX_RPROC_SCU_API:
> > > + ret = imx_scu_get_handle(&priv->ipc_handle);
> > > + if (ret)
> > > + return ret;
> > > + ret = of_property_read_u32(dev->of_node, "fsl,resource-id",
> > &priv->rsrc_id);
> > > + if (ret) {
> > > + dev_err(dev, "No fsl,resource-id property\n");
> > > + return ret;
> > > + }
> > > +
> > > + /*
> > > + * If Mcore resource is not owned by Acore partition, It is
> > kicked by ROM,
> > > + * and Linux could only do IPC with Mcore and nothing else.
> > > + */
> > > + if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv-
> > >rsrc_id))
> > > + return 0;
> >
> > If imx_sc_rm_is_resource_owned() return '1' than the remote processor is
> > under Linux's control and what follows below is not needed. That is also
> > coherent with the comment in [1].
>
> Case 1: If M4 is owned by Linux, here directly return 0.
> Case 2: If M4 is not owned by Linux, the following code after this line will set
> state as RPROC_DETACHED.
I understand that part.
>
> Patch 3/6(this patch) is only to support case 2.
> Patch 4/6 is to support case 1.
>
Let's leave the subsequent patches alone for now.
> >
> > That is in contrast with what is happening in imx_rproc_put_scu(). There, if
> > the remote processor is _not_ owned by Linux than the condition returns
> > without calling imx_scu_irq_group_enable() and
> > imx_scu_irq_unregister_notifier(). That seems to be a bug.
>
> No. The two functions only needed when M4 is in a separate hardware partition.
>
> The scu irq is only needed when M4 is out of linux control and need some
> notification such as M4 is reset by SCU(System Control Unit). That linux got
> notification that M4 is reset by SCU.
I also understand that part.
What I am underlining here is that when the M4 is independent, function
imx_scu_irq_register_notifier() and imx_scu_irq_group_enable() are called but
their cleanup equivalent are not called in imx_rproc_put_scu() because of the '!'
in the if() statement.
>
> >
> > There is also a problem in patch 4/6 associated to that.
>
> If the upper explanation eliminate your concern, "a problem in patch 4/6" should
> not be a problem.
>
> When M4 is owned by Linux, Linux need handle the power domain. If M4 is not owned
> by Linux, SCU firmware will handle the power domain, and Linux has no permission to
> touch that.
>
> Thanks
> Peng
>
> >
> > Thanks,
> > Mathieu
> >
> >
> > [1].
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir
> > .bootlin.com%2Flinux%2Fv6.0-
> > rc7%2Fsource%2Fdrivers%2Ffirmware%2Fimx%2Frm.c%23L24&data=0
> > 5%7C01%7Cpeng.fan%40nxp.com%7Cbe679e9a409a48b834b908daa015d92
> > c%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637998312946913
> > 710%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu
> > MzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=
> > JDRvoDGGgEiSmbhj3410V2DNxamZbDmMS0U2GvBnI74%3D&reserved
> > =0
> >
> > > +
> > > + priv->rproc->state = RPROC_DETACHED;
> > > + priv->rproc->recovery_disabled = true;
> > > +
> > > + /* Get partition id and enable irq in SCFW */
> > > + ret = imx_sc_rm_get_resource_owner(priv->ipc_handle,
> > priv->rsrc_id, &pt);
> > > + if (ret) {
> > > + dev_err(dev, "not able to get resource owner\n");
> > > + return ret;
> > > + }
> > > +
> > > + priv->rproc_pt = pt;
> > > + priv->rproc_nb.notifier_call = imx_rproc_partition_notify;
> > > +
> > > + ret = imx_scu_irq_register_notifier(&priv->rproc_nb);
> > > + if (ret) {
> > > + dev_warn(dev, "register scu notifier failed.\n");
> > > + return ret;
> > > + }
> > > +
> > > + ret =
> > imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_REBOOTED, BIT(priv-
> > >rproc_pt),
> > > + true);
> > > + if (ret) {
> > > + imx_scu_irq_unregister_notifier(&priv->rproc_nb);
> > > + dev_warn(dev, "Enable irq failed.\n");
> > > + return ret;
> > > + }
> > > +
> > > + return 0;
> > > default:
> > > break;
> > > }
> > > @@ -803,7 +905,7 @@ static int imx_rproc_probe(struct platform_device
> > > *pdev)
> > >
> > > ret = imx_rproc_clk_enable(priv);
> > > if (ret)
> > > - goto err_put_mbox;
> > > + goto err_put_scu;
> > >
> > > INIT_WORK(&priv->rproc_work, imx_rproc_vq_work);
> > >
> > > @@ -820,6 +922,8 @@ static int imx_rproc_probe(struct platform_device
> > > *pdev)
> > >
> > > err_put_clk:
> > > clk_disable_unprepare(priv->clk);
> > > +err_put_scu:
> > > + imx_rproc_put_scu(rproc);
> > > err_put_mbox:
> > > imx_rproc_free_mbox(rproc);
> > > err_put_wkq:
> > > @@ -837,6 +941,7 @@ static int imx_rproc_remove(struct
> > platform_device
> > > *pdev)
> > >
> > > clk_disable_unprepare(priv->clk);
> > > rproc_del(rproc);
> > > + imx_rproc_put_scu(rproc);
> > > imx_rproc_free_mbox(rproc);
> > > destroy_workqueue(priv->workqueue);
> > > rproc_free(rproc);
> > > @@ -852,6 +957,7 @@ static const struct of_device_id
> > imx_rproc_of_match[] = {
> > > { .compatible = "fsl,imx8mm-cm4", .data =
> > &imx_rproc_cfg_imx8mq },
> > > { .compatible = "fsl,imx8mn-cm7", .data =
> > &imx_rproc_cfg_imx8mn },
> > > { .compatible = "fsl,imx8mp-cm7", .data =
> > &imx_rproc_cfg_imx8mn },
> > > + { .compatible = "fsl,imx8qxp-cm4", .data =
> > &imx_rproc_cfg_imx8qxp },
> > > { .compatible = "fsl,imx8ulp-cm33", .data =
> > &imx_rproc_cfg_imx8ulp },
> > > { .compatible = "fsl,imx93-cm33", .data = &imx_rproc_cfg_imx93 },
> > > {},
> > > --
> > > 2.37.1
> > >
