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Message-ID: <Z+7dso+tsYpSBSFi@lizhi-Precision-Tower-5810>
Date: Thu, 3 Apr 2025 15:12:50 -0400
From: Frank Li <Frank.li@....com>
To: "Iuliana Prodan (OSS)" <iuliana.prodan@....nxp.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Bjorn Andersson <andersson@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
"S.J. Wang" <shengjiu.wang@....com>,
Fabio Estevam <festevam@...il.com>,
Daniel Baluta <daniel.baluta@....com>,
Mpuaudiosw <Mpuaudiosw@....com>,
Iuliana Prodan <iuliana.prodan@....com>, imx@...ts.linux.dev,
linux-remoteproc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH v3] remoteproc: imx_dsp_rproc: Add support for
DSP-specific features
On Thu, Apr 03, 2025 at 01:01:24PM +0300, Iuliana Prodan (OSS) wrote:
> From: Iuliana Prodan <iuliana.prodan@....com>
subject: remoteproc: imx_dsp_rproc: add handle_rsc callback to handle DSP-specific features
> Some DSP firmware requires a FW_READY signal before proceeding, while
> others do not.
> Therefore, add support to handle i.MX DSP-specific features.
Add support to handle i.MX DSP-specific features because Some DSP firmware
requires a FW_READY signal before proceeding
>
> Implement handle_rsc callback to handle resource table parsing and to
> process DSP-specific resource, to determine if waiting is needed.
Implement the handle_rsc callback to parse the resource table and process
DSP-specific resources to determine if waiting is needed.
>
> Update imx_dsp_rproc_start() to handle this condition accordingly.
>
> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
> ---
> Changes in v3:
> - Reviews from Mathieu Poirier:
> - Added version and magic number to vendor-specific resource table entry.
> - Updated defines to maintain backward compatibility with a resource table that doesn't have a vendor-specific resource.
> - By default, wait for `fw_ready`, unless specified otherwise.
> - Link to v2: https://lore.kernel.org/all/20250318215007.2109726-1-iuliana.prodan@oss.nxp.com
>
> Changes in v2:
> - Reviews from Mathieu Poirier:
> - Use vendor-specific resource table entry.
> - Implement resource handler specific to the i.MX DSP.
> - Revise commit message to include recent updates.
> - Link to v1: https://lore.kernel.org/all/20250305123923.514386-1-iuliana.prodan@oss.nxp.com/
>
> drivers/remoteproc/imx_dsp_rproc.c | 102 ++++++++++++++++++++++++++++-
> 1 file changed, 100 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index b9bb15970966..80d4470cc731 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -35,9 +35,17 @@ module_param_named(no_mailboxes, no_mailboxes, int, 0644);
> MODULE_PARM_DESC(no_mailboxes,
> "There is no mailbox between cores, so ignore remote proc reply after start, default is 0 (off).");
>
> +/* Flag indicating that the remote is up and running */
> #define REMOTE_IS_READY BIT(0)
> +/* Flag indicating that the host should wait for a firmware-ready response */
> +#define WAIT_FW_READY BIT(1)
> #define REMOTE_READY_WAIT_MAX_RETRIES 500
>
> +/* This flag is set in the DSP resource table's features field to indicate
> + * that the firmware requires the host NOT to wait for a FW_READY response.
> + */
multi line comments should be
/*
* This ..
*/
> +#define FEATURE_DONT_WAIT_FW_READY BIT(0)
> +
> /* att flags */
> /* DSP own area */
> #define ATT_OWN BIT(31)
> @@ -72,6 +80,10 @@ MODULE_PARM_DESC(no_mailboxes,
>
> #define IMX8ULP_SIP_HIFI_XRDC 0xc200000e
>
> +#define FW_RSC_NXP_S_MAGIC ((uint32_t)'n' << 24 | \
> + (uint32_t)'x' << 16 | \
> + (uint32_t)'p' << 8 | \
> + (uint32_t)'s')
> /*
> * enum - Predefined Mailbox Messages
> *
> @@ -136,6 +148,24 @@ struct imx_dsp_rproc_dcfg {
> int (*reset)(struct imx_dsp_rproc *priv);
> };
>
> +/**
> + * struct fw_rsc_imx_dsp - i.MX DSP specific info
> + *
> + * @len: length of the resource entry
> + * @magic_num: 32-bit magic number
> + * @version: version of data structure
> + * @features: feature flags supported by the i.MX DSP firmware
> + *
> + * This represents a DSP-specific resource in the firmware's
> + * resource table, providing information on supported features.
> + */
> +struct fw_rsc_imx_dsp {
> + uint32_t len;
> + uint32_t magic_num;
> + uint32_t version;
> + uint32_t features;
> +} __packed;
> +
> static const struct imx_rproc_att imx_dsp_rproc_att_imx8qm[] = {
> /* dev addr , sys addr , size , flags */
> { 0x596e8000, 0x556e8000, 0x00008000, ATT_OWN },
> @@ -300,6 +330,73 @@ static int imx_dsp_rproc_ready(struct rproc *rproc)
> return -ETIMEDOUT;
> }
>
> +/**
> + * imx_dsp_rproc_handle_rsc() - Handle DSP-specific resource table entries
> + * @rproc: remote processor instance
> + * @rsc_type: resource type identifier
> + * @rsc: pointer to the resource entry
> + * @offset: offset of the resource entry
> + * @avail: available space in the resource table
> + *
> + * Parse the DSP-specific resource entry and update flags accordingly.
> + * If the WAIT_FW_READY feature is set, the host must wait for the firmware
> + * to signal readiness before proceeding with execution.
> + *
> + * Return: RSC_HANDLED if processed successfully, RSC_IGNORED otherwise.
> + */
> +static int imx_dsp_rproc_handle_rsc(struct rproc *rproc, u32 rsc_type,
> + void *rsc, int offset, int avail)
> +{
> + struct imx_dsp_rproc *priv = rproc->priv;
> + struct fw_rsc_imx_dsp *imx_dsp_rsc = rsc;
> + struct device *dev = rproc->dev.parent;
> + size_t expected_size;
> +
put
priv->flags |= WAIT_FW_READY;
here,
all "goto ignored" can be replace with "return RSC_IGNORED"
> + if (!imx_dsp_rsc) {
> + dev_dbg(dev, "Invalid fw_rsc_imx_dsp.\n");
> + goto ignored;
> + }
> +
> + /* Make sure resource isn't truncated */
> + expected_size = imx_dsp_rsc->len + sizeof(imx_dsp_rsc->len);
> + if (expected_size < sizeof(struct fw_rsc_imx_dsp)) {
> + dev_dbg(dev, "Resource fw_rsc_imx_dsp is truncated.\n");
> + goto ignored;
> + }
> +
> + /*
> + * If FW_RSC_NXP_S_MAGIC number is not found then
> + * wait for fw_ready reply (default work flow)
> + */
> + if (imx_dsp_rsc->magic_num != FW_RSC_NXP_S_MAGIC) {
> + dev_dbg(dev, "Invalid resource table magic number.\n");
> + goto ignored;
> + }
> +
> + /*
> + * For now, in struct fw_rsc_imx_dsp, version 0,
> + * only FEATURE_DONT_WAIT_FW_READY is valid.
> + *
> + * When adding new features, please upgrade version.
> + */
> + if (imx_dsp_rsc->version > 0) {
> + dev_warn(dev, "Unexpected fw_rsc_imx_dsp version %d.\n",
> + imx_dsp_rsc->version);
> + goto ignored;
> + }
> +
> + if (imx_dsp_rsc->features & FEATURE_DONT_WAIT_FW_READY)
> + priv->flags &= ~WAIT_FW_READY;
> + else
> + priv->flags |= WAIT_FW_READY;
if set WAIT_FW_READY at beginning, else branch can be removed.
Frank
> +
> + return RSC_HANDLED;
> +
> +ignored:
> + priv->flags |= WAIT_FW_READY;
> + return RSC_IGNORED;
> +}
> +
> /*
> * Start function for rproc_ops
> *
> @@ -335,8 +432,8 @@ static int imx_dsp_rproc_start(struct rproc *rproc)
>
> if (ret)
> dev_err(dev, "Failed to enable remote core!\n");
> - else
> - ret = imx_dsp_rproc_ready(rproc);
> + else if (priv->flags & WAIT_FW_READY)
> + return imx_dsp_rproc_ready(rproc);
>
> return ret;
> }
> @@ -936,6 +1033,7 @@ static const struct rproc_ops imx_dsp_rproc_ops = {
> .kick = imx_dsp_rproc_kick,
> .load = imx_dsp_rproc_elf_load_segments,
> .parse_fw = imx_dsp_rproc_parse_fw,
> + .handle_rsc = imx_dsp_rproc_handle_rsc,
> .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
> .sanity_check = rproc_elf_sanity_check,
> .get_boot_addr = rproc_elf_get_boot_addr,
> --
> 2.25.1
>
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