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Date: Tue, 18 Jan 2022 11:57:29 -0700
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: bjorn.andersson@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
linux-imx@....com, linux-remoteproc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 6/9] remoteproc: imx_rproc: support attaching to i.MX8QXP
M4
On Tue, Jan 11, 2022 at 11:33:30AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
>
> 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.
>
> When M4 crash reboot, it could notify Linux, so Linux could prepare to
> reattach to M4 after M4 recovery.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> drivers/remoteproc/imx_rproc.c | 96 ++++++++++++++++++++++++++++++++++
> 1 file changed, 96 insertions(+)
>
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 0e99a3ca6fbc..5f04aea2f6a1 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
> @@ -90,6 +93,23 @@ struct imx_rproc {
> struct workqueue_struct *workqueue;
> void __iomem *rsc_table;
> bool has_clk;
> + struct imx_sc_ipc *ipc_handle;
> + struct notifier_block proc_nb;
> + u32 rproc_pt;
> + u32 rsrc;
There is no documentation for the above two fields and I have to guess what they
do.
> +};
> +
> +static const struct imx_rproc_att imx_rproc_att_imx8qxp[] = {
> + /* dev addr , sys addr , size , flags */
> + { 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[] = {
> @@ -236,6 +256,12 @@ static const struct imx_rproc_dcfg imx_rproc_cfg_imx8ulp = {
> .method = IMX_RPROC_NONE,
> };
>
> +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_imx7ulp = {
> .att = imx_rproc_att_imx7ulp,
> .att_size = ARRAY_SIZE(imx_rproc_att_imx7ulp),
> @@ -491,6 +517,11 @@ static int imx_rproc_attach(struct rproc *rproc)
> return 0;
> }
>
> +static int imx_rproc_detach(struct rproc *rproc)
> +{
> + return 0;
Is it possible to detach the remote processor from the application core? If not
please write a comment that says so. And shouldn't this return some kind of
error so that users don't think the operation was carried out successfully?
I am out of time for today and as such will continue with this set tomorrow.
Thanks,
Mathieu
> +}
> +
> static struct resource_table *imx_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> {
> struct imx_rproc *priv = rproc->priv;
> @@ -525,6 +556,7 @@ imx_rproc_elf_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *
> static const struct rproc_ops imx_rproc_ops = {
> .prepare = imx_rproc_prepare,
> .attach = imx_rproc_attach,
> + .detach = imx_rproc_detach,
> .start = imx_rproc_start,
> .stop = imx_rproc_stop,
> .kick = imx_rproc_kick,
> @@ -671,6 +703,22 @@ static void imx_rproc_free_mbox(struct rproc *rproc)
> mbox_free_channel(priv->rx_ch);
> }
>
> +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, proc_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("Patition%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" };
> @@ -680,6 +728,7 @@ 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:
> @@ -690,6 +739,52 @@ 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, "rsrc-id", &priv->rsrc);
> + if (ret) {
> + dev_err(dev, "no rsrc-id\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)) {
> +
> + priv->has_clk = false;
> + priv->rproc->self_recovery = true;
> + priv->rproc->state = RPROC_DETACHED;
> +
> + /* Get partition id and enable irq in SCFW */
> + ret = imx_sc_rm_get_resource_owner(priv->ipc_handle, priv->rsrc, &pt);
> + if (ret) {
> + dev_err(dev, "not able to get resource owner\n");
> + return ret;
> + }
> +
> + priv->rproc_pt = pt;
> + priv->proc_nb.notifier_call = imx_rproc_partition_notify;
> +
> + ret = imx_scu_irq_register_notifier(&priv->proc_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->proc_nb);
> + dev_warn(dev, "Enable irq failed.\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> default:
> break;
> }
> @@ -847,6 +942,7 @@ 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 },
> {},
> };
> --
> 2.25.1
>
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