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Date: Fri, 04 Sep 2020 14:23:44 +0900
From: Punit Agrawal <punit1.agrawal@...hiba.co.jp>
To: Ben Levinsky <ben.levinsky@...inx.com>
Cc: stefanos@...inx.com, michals@...inx.com,
devicetree@...r.kernel.org, emooring@...inx.com,
michael.auchter@...com, mathieu.poirier@...aro.org,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
jliang@...inx.com, robh+dt@...nel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v12 3/5] firmware: xilinx: Add RPU configuration APIs
Hi Ben,
Thanks for addressing the comments on the previous version. One comment
below.
Ben Levinsky <ben.levinsky@...inx.com> writes:
> This patch adds APIs to access to configure RPU and its
> processor-specific memory.
>
> That is query the run-time mode of RPU as either split or lockstep as well
> as API to set this mode. In addition add APIs to access configuration of
> the RPUs' tightly coupled memory (TCM).
>
> Signed-off-by: Ben Levinsky <ben.levinsky@...inx.com>
> ---
> v3:
> - add xilinx-related platform mgmt fn's instead of wrapping around
> function pointer in xilinx eemi ops struct
> v4:
> - add default values for enums
> v9:
> - update commit message
> - for zynqmp_pm_set_tcm_config and zynqmp_pm_get_rpu_mode update docs for
> expected output, arguments as well removing unused args
> - remove unused fn zynqmp_pm_get_node_status
> v11:
> - update usage of zynqmp_pm_get_rpu_mode to return rpu mode in enum
> - update zynqmp_pm_set_tcm_config and zynqmp_pm_set_rpu_mode arguments to remove unused args
> v12:
> - in drivers/firmware/zynqmp.c, update zynqmp_pm_set_rpu_mode so rpu_mode
> is only set if no error
> - update args for zynqmp_pm_set_rpu_mode, zynqmp_pm_set_tcm_config fn arg's to
> reflect what is expected in the function and the usage in
> zynqmp_r5_remoteproc accordingly
> ---
> drivers/firmware/xilinx/zynqmp.c | 60 ++++++++++++++++++++++++++++
> include/linux/firmware/xlnx-zynqmp.h | 18 +++++++++
> 2 files changed, 78 insertions(+)
>
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index a966ee956573..916a0b15ab33 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -846,6 +846,66 @@ int zynqmp_pm_release_node(const u32 node)
> }
> EXPORT_SYMBOL_GPL(zynqmp_pm_release_node);
>
> +/**
> + * zynqmp_pm_get_rpu_mode() - Get RPU mode
> + * @node_id: Node ID of the device
> + * @rpu_mode: return by reference value
> + * either split or lockstep
> + *
> + * Return: return 0 on success or error+reason.
> + * if success, then rpu_mode will be set
> + * to current rpu mode.
> + */
> +int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode)
> +{
> + u32 ret_payload[PAYLOAD_ARG_CNT];
> + int ret;
> +
> + ret = zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
> + IOCTL_GET_RPU_OPER_MODE, 0, 0, ret_payload);
> +
> + /* only set rpu_mode if no error */
> + *rpu_mode = ret_payload[0];
The comment and the statement do not match. rpu_mode is being
un-conditionally set even if there is an error.
It's not clear which is correct - the code or the comment?
Other than that, the rest of the patch looks fine.
Thanks,
Punit
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_get_rpu_mode);
> +
> +/**
> + * zynqmp_pm_set_rpu_mode() - Set RPU mode
> + * @node_id: Node ID of the device
> + * @rpu_mode: Argument 1 to requested IOCTL call. either split or lockstep
> + *
> + * This function is used to set RPU mode to split or
> + * lockstep
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +int zynqmp_pm_set_rpu_mode(u32 node_id, enum rpu_oper_mode rpu_mode)
> +{
> + return zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
> + IOCTL_SET_RPU_OPER_MODE, (u32)rpu_mode,
> + 0, NULL);
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_set_rpu_mode);
> +
> +/**
> + * zynqmp_pm_set_tcm_config - configure TCM
> + * @tcm_mode: Argument 1 to requested IOCTL call
> + * either PM_RPU_TCM_COMB or PM_RPU_TCM_SPLIT
> + *
> + * This function is used to set RPU mode to split or combined
> + *
> + * Return: status: 0 for success, else failure
> + */
> +int zynqmp_pm_set_tcm_config(u32 node_id, enum rpu_tcm_comb tcm_mode)
> +{
> + return zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
> + IOCTL_TCM_COMB_CONFIG, (u32)tcm_mode, 0,
> + NULL);
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_set_tcm_config);
> +
> /**
> * zynqmp_pm_force_pwrdwn - PM call to request for another PU or subsystem to
> * be powered down forcefully
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 6241c5ac51b3..79aa2fcbcd54 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -385,6 +385,9 @@ int zynqmp_pm_request_wake(const u32 node,
> const bool set_addr,
> const u64 address,
> const enum zynqmp_pm_request_ack ack);
> +int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode);
> +int zynqmp_pm_set_rpu_mode(u32 node_id, u32 arg1);
> +int zynqmp_pm_set_tcm_config(u32 node_id, u32 arg1);
> #else
> static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
> {
> @@ -549,6 +552,21 @@ static inline int zynqmp_pm_request_wake(const u32 node,
> {
> return -ENODEV;
> }
> +
> +static inline int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode)
> +{
> + return -ENODEV;
> +}
> +
> +static inline int zynqmp_pm_set_rpu_mode(u32 node_id, u32 arg1)
> +{
> + return -ENODEV;
> +}
> +
> +static inline int zynqmp_pm_set_tcm_config(u32 node_id, u32 arg1)
> +{
> + return -ENODEV;
> +}
> #endif
>
> #endif /* __FIRMWARE_ZYNQMP_H__ */
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