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Date: Thu, 23 Nov 2023 14:41:27 +0000
From: Simon Horman <horms@...nel.org>
To: Michal Michalik <michal.michalik@...el.com>
Cc: netdev@...r.kernel.org, vadim.fedorenko@...ux.dev,
	arkadiusz.kubalewski@...el.com, jonathan.lemon@...il.com,
	pabeni@...hat.com, poros@...hat.com, milena.olech@...el.com,
	mschmidt@...hat.com, linux-clk@...r.kernel.org, bvanassche@....org,
	kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com
Subject: Re: [PATCH RFC net-next v4 1/2] netdevsim: implement DPLL for
 subsystem selftests

On Thu, Nov 23, 2023 at 05:52:42AM -0500, Michal Michalik wrote:
> DPLL subsystem integration tests require a module which mimics the
> behavior of real driver which supports DPLL hardware. To fully test the
> subsystem the netdevsim is amended with DPLL implementation.
> 
> Signed-off-by: Michal Michalik <michal.michalik@...el.com>

...

> diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
> index b4d3b9cde8bd..76da4e8aa9af 100644
> --- a/drivers/net/netdevsim/dev.c
> +++ b/drivers/net/netdevsim/dev.c
> @@ -342,6 +342,17 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
>  	debugfs_create_file("max_vfs", 0600, nsim_dev->ddir,
>  			    nsim_dev, &nsim_dev_max_vfs_fops);
>  
> +	debugfs_create_u64("dpll_clock_id", 0600,
> +			   nsim_dev->ddir, &nsim_dev->dpll.dpll_e_pd.clock_id);
> +	debugfs_create_u32("dpll_e_status", 0600, nsim_dev->ddir,
> +			   &nsim_dev->dpll.dpll_e_pd.status);
> +	debugfs_create_u32("dpll_p_status", 0600, nsim_dev->ddir,
> +			   &nsim_dev->dpll.dpll_p_pd.status);
> +	debugfs_create_u32("dpll_e_temp", 0600, nsim_dev->ddir,
> +			   &nsim_dev->dpll.dpll_e_pd.temperature);
> +	debugfs_create_u32("dpll_p_temp", 0600, nsim_dev->ddir,
> +			   &nsim_dev->dpll.dpll_p_pd.temperature);
> +
>  	nsim_dev->nodes_ddir = debugfs_create_dir("rate_nodes", nsim_dev->ddir);
>  	if (IS_ERR(nsim_dev->nodes_ddir)) {
>  		err = PTR_ERR(nsim_dev->nodes_ddir);
> @@ -1601,14 +1612,21 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
>  	if (err)
>  		goto err_psample_exit;
>  
> -	err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
> +	err = nsim_dpll_init_owner(&nsim_dev->dpll, nsim_bus_dev->port_count);
>  	if (err)
>  		goto err_hwstats_exit;
>  
> +	err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
> +	if (err)
> +		goto err_teardown_dpll;
> +
>  	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
>  	devl_unlock(devlink);
> +
>  	return 0;
>  
> +err_teardown_dpll:
> +	nsim_dpll_free_owner(&nsim_dev->dpll);
>  err_hwstats_exit:
>  	nsim_dev_hwstats_exit(nsim_dev);
>  err_psample_exit:
> @@ -1656,6 +1674,7 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
>  	}
>  
>  	nsim_dev_port_del_all(nsim_dev);
> +	nsim_dpll_free_owner(&nsim_dev->dpll);
>  	nsim_dev_hwstats_exit(nsim_dev);
>  	nsim_dev_psample_exit(nsim_dev);
>  	nsim_dev_health_exit(nsim_dev);
> diff --git a/drivers/net/netdevsim/dpll.c b/drivers/net/netdevsim/dpll.c
> new file mode 100644
> index 000000000000..26a8b0f3be16
> --- /dev/null
> +++ b/drivers/net/netdevsim/dpll.c
> @@ -0,0 +1,489 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2023, Intel Corporation.
> + * Author: Michal Michalik <michal.michalik@...el.com>
> + */
> +#include "netdevsim.h"
> +
> +#define EEC_DPLL_DEV 0
> +#define EEC_DPLL_TEMPERATURE 20
> +#define PPS_DPLL_DEV 1
> +#define PPS_DPLL_TEMPERATURE 30
> +
> +#define PIN_GNSS 0
> +#define PIN_GNSS_CAPABILITIES DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE
> +#define PIN_GNSS_PRIORITY 5
> +
> +#define PIN_PPS 1
> +#define PIN_PPS_CAPABILITIES                          \
> +	(DPLL_PIN_CAPABILITIES_DIRECTION_CAN_CHANGE | \
> +	 DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE |  \
> +	 DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE)
> +#define PIN_PPS_PRIORITY 6
> +
> +#define PIN_RCLK 2
> +#define PIN_RCLK_CAPABILITIES                        \
> +	(DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE | \
> +	 DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE)
> +#define PIN_RCLK_PRIORITY 7
> +
> +#define EEC_PINS_NUMBER 3
> +#define PPS_PINS_NUMBER 2
> +
> +static int nsim_fill_pin_properties(struct dpll_pin_properties *pp,
> +				    const char *label, enum dpll_pin_type type,
> +				    unsigned long caps, u32 freq_supp_num,
> +				    u64 fmin, u64 fmax)
> +{
> +	struct dpll_pin_frequency *freq_supp;
> +
> +	freq_supp = kzalloc(sizeof(*freq_supp), GFP_KERNEL);
> +	if (!freq_supp)
> +		goto freq_supp;
> +	freq_supp->min = fmin;
> +	freq_supp->max = fmax;
> +
> +	pp->board_label = kasprintf(GFP_KERNEL, "%s_brd", label);
> +	if (!pp->board_label)
> +		goto board_label;
> +	pp->panel_label = kasprintf(GFP_KERNEL, "%s_pnl", label);
> +	if (!pp->panel_label)
> +		goto panel_label;
> +	pp->package_label = kasprintf(GFP_KERNEL, "%s_pcg", label);
> +	if (!pp->package_label)
> +		goto package_label;
> +	pp->freq_supported_num = freq_supp_num;
> +	pp->freq_supported = freq_supp;
> +	pp->capabilities = caps;
> +	pp->type = type;
> +
> +	return 0;
> +
> +package_label:
> +	kfree(pp->panel_label);
> +panel_label:
> +	kfree(pp->board_label);
> +board_label:
> +	kfree(freq_supp);
> +freq_supp:
> +	return -ENOMEM;
> +}
> +
> +static void nsim_fill_pin_pd(struct nsim_pin_priv_data *pd, u64 frequency,
> +			     u32 prio, enum dpll_pin_direction direction)
> +{
> +	pd->state_dpll = DPLL_PIN_STATE_DISCONNECTED;
> +	pd->state_pin = DPLL_PIN_STATE_DISCONNECTED;
> +	pd->frequency = frequency;
> +	pd->direction = direction;
> +	pd->prio = prio;
> +}
> +
> +static int nsim_dds_ops_mode_get(const struct dpll_device *dpll,
> +				 void *dpll_priv, enum dpll_mode *mode,
> +				 struct netlink_ext_ack *extack)
> +{
> +	struct nsim_dpll_priv_data *pd = dpll_priv;
> +	*mode = pd->mode;
> +	return 0;
> +};
> +
> +static bool nsim_dds_ops_mode_supported(const struct dpll_device *dpll,
> +					void *dpll_priv,
> +					const enum dpll_mode mode,
> +					struct netlink_ext_ack *extack)
> +{
> +	return true;
> +};
> +
> +static int nsim_dds_ops_lock_status_get(const struct dpll_device *dpll,
> +					void *dpll_priv,
> +					enum dpll_lock_status *status,
> +					struct netlink_ext_ack *extack)
> +{
> +	struct nsim_dpll_priv_data *pd = dpll_priv;
> +
> +	*status = pd->status;
> +	return 0;
> +};
> +
> +static int nsim_dds_ops_temp_get(const struct dpll_device *dpll,
> +				 void *dpll_priv, s32 *temp,
> +				 struct netlink_ext_ack *extack)
> +{
> +	struct nsim_dpll_priv_data *pd = dpll_priv;
> +
> +	*temp = pd->temperature;
> +	return 0;
> +};
> +
> +static int nsim_pin_frequency_set(const struct dpll_pin *pin, void *pin_priv,
> +				  const struct dpll_device *dpll,
> +				  void *dpll_priv, const u64 frequency,
> +				  struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	pd->frequency = frequency;
> +	return 0;
> +};
> +
> +static int nsim_pin_frequency_get(const struct dpll_pin *pin, void *pin_priv,
> +				  const struct dpll_device *dpll,
> +				  void *dpll_priv, u64 *frequency,
> +				  struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	*frequency = pd->frequency;
> +	return 0;
> +};
> +
> +static int nsim_pin_direction_set(const struct dpll_pin *pin, void *pin_priv,
> +				  const struct dpll_device *dpll,
> +				  void *dpll_priv,
> +				  const enum dpll_pin_direction direction,
> +				  struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	pd->direction = direction;
> +	return 0;
> +};
> +
> +static int nsim_pin_direction_get(const struct dpll_pin *pin, void *pin_priv,
> +				  const struct dpll_device *dpll,
> +				  void *dpll_priv,
> +				  enum dpll_pin_direction *direction,
> +				  struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	*direction = pd->direction;
> +	return 0;
> +};
> +
> +static int nsim_pin_state_on_pin_get(const struct dpll_pin *pin, void *pin_priv,
> +				     const struct dpll_pin *parent_pin,
> +				     void *parent_priv,
> +				     enum dpll_pin_state *state,
> +				     struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	*state = pd->state_pin;
> +	return 0;
> +};
> +
> +static int nsim_pin_state_on_dpll_get(const struct dpll_pin *pin,
> +				      void *pin_priv,
> +				      const struct dpll_device *dpll,
> +				      void *dpll_priv,
> +				      enum dpll_pin_state *state,
> +				      struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	*state = pd->state_dpll;
> +	return 0;
> +};
> +
> +static int nsim_pin_state_on_pin_set(const struct dpll_pin *pin, void *pin_priv,
> +				     const struct dpll_pin *parent_pin,
> +				     void *parent_priv,
> +				     const enum dpll_pin_state state,
> +				     struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	pd->state_pin = state;
> +	return 0;
> +};
> +
> +static int nsim_pin_state_on_dpll_set(const struct dpll_pin *pin,
> +				      void *pin_priv,
> +				      const struct dpll_device *dpll,
> +				      void *dpll_priv,
> +				      const enum dpll_pin_state state,
> +				      struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	pd->state_dpll = state;
> +	return 0;
> +};
> +
> +static int nsim_pin_prio_get(const struct dpll_pin *pin, void *pin_priv,
> +			     const struct dpll_device *dpll, void *dpll_priv,
> +			     u32 *prio, struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	*prio = pd->prio;
> +	return 0;
> +};
> +
> +static int nsim_pin_prio_set(const struct dpll_pin *pin, void *pin_priv,
> +			     const struct dpll_device *dpll, void *dpll_priv,
> +			     const u32 prio, struct netlink_ext_ack *extack)
> +{
> +	struct nsim_pin_priv_data *pd = pin_priv;
> +
> +	pd->prio = prio;
> +	return 0;
> +};
> +
> +static void nsim_free_pin_properties(struct dpll_pin_properties *pp)
> +{
> +	kfree(pp->board_label);
> +	kfree(pp->panel_label);
> +	kfree(pp->package_label);
> +	kfree(pp->freq_supported);
> +}
> +
> +static struct dpll_device_ops nsim_dds_ops = {
> +	.mode_get = nsim_dds_ops_mode_get,
> +	.mode_supported = nsim_dds_ops_mode_supported,
> +	.lock_status_get = nsim_dds_ops_lock_status_get,
> +	.temp_get = nsim_dds_ops_temp_get,
> +};
> +
> +static struct dpll_pin_ops nsim_pin_ops = {
> +	.frequency_set = nsim_pin_frequency_set,
> +	.frequency_get = nsim_pin_frequency_get,
> +	.direction_set = nsim_pin_direction_set,
> +	.direction_get = nsim_pin_direction_get,
> +	.state_on_pin_get = nsim_pin_state_on_pin_get,
> +	.state_on_dpll_get = nsim_pin_state_on_dpll_get,
> +	.state_on_pin_set = nsim_pin_state_on_pin_set,
> +	.state_on_dpll_set = nsim_pin_state_on_dpll_set,
> +	.prio_get = nsim_pin_prio_get,
> +	.prio_set = nsim_pin_prio_set,
> +};
> +
> +int nsim_dpll_init_owner(struct nsim_dpll *dpll, unsigned int ports_count)
> +{
> +	u64 clock_id;
> +	int err;
> +
> +	get_random_bytes(&clock_id, sizeof(clock_id));
> +
> +	/* Create EEC DPLL */
> +	dpll->dpll_e = dpll_device_get(clock_id, EEC_DPLL_DEV, THIS_MODULE);
> +	if (IS_ERR(dpll->dpll_e))
> +		return -EFAULT;
> +
> +	dpll->dpll_e_pd.temperature = EEC_DPLL_TEMPERATURE;
> +	dpll->dpll_e_pd.mode = DPLL_MODE_AUTOMATIC;
> +	dpll->dpll_e_pd.clock_id = clock_id;
> +	dpll->dpll_e_pd.status = DPLL_LOCK_STATUS_UNLOCKED;
> +
> +	err = dpll_device_register(dpll->dpll_e, DPLL_TYPE_EEC, &nsim_dds_ops,
> +				   &dpll->dpll_e_pd);
> +	if (err)
> +		goto e_reg;
> +
> +	/* Create PPS DPLL */
> +	dpll->dpll_p = dpll_device_get(clock_id, PPS_DPLL_DEV, THIS_MODULE);
> +	if (IS_ERR(dpll->dpll_p))
> +		goto dpll_p;
> +
> +	dpll->dpll_p_pd.temperature = PPS_DPLL_TEMPERATURE;
> +	dpll->dpll_p_pd.mode = DPLL_MODE_MANUAL;
> +	dpll->dpll_p_pd.clock_id = clock_id;
> +	dpll->dpll_p_pd.status = DPLL_LOCK_STATUS_UNLOCKED;
> +
> +	err = dpll_device_register(dpll->dpll_p, DPLL_TYPE_PPS, &nsim_dds_ops,
> +				   &dpll->dpll_p_pd);
> +	if (err)
> +		goto p_reg;
> +
> +	/* Create first pin (GNSS) */
> +	err = nsim_fill_pin_properties(&dpll->pp_gnss, "GNSS",
> +				       DPLL_PIN_TYPE_GNSS,
> +				       PIN_GNSS_CAPABILITIES, 1,
> +				       DPLL_PIN_FREQUENCY_1_HZ,
> +				       DPLL_PIN_FREQUENCY_1_HZ);
> +	if (err)
> +		goto pp_gnss;
> +	dpll->p_gnss =
> +		dpll_pin_get(clock_id, PIN_GNSS, THIS_MODULE, &dpll->pp_gnss);
> +	if (IS_ERR(dpll->p_gnss))
> +		goto p_gnss;

Hi Michal,

I think that err needs to be set to something inside the if condition
above.

> +	nsim_fill_pin_pd(&dpll->p_gnss_pd, DPLL_PIN_FREQUENCY_1_HZ,
> +			 PIN_GNSS_PRIORITY, DPLL_PIN_DIRECTION_INPUT);
> +	err = dpll_pin_register(dpll->dpll_e, dpll->p_gnss, &nsim_pin_ops,
> +				&dpll->p_gnss_pd);
> +	if (err)
> +		goto e_gnss_reg;
> +
> +	/* Create second pin (PPS) */
> +	err = nsim_fill_pin_properties(&dpll->pp_pps, "PPS", DPLL_PIN_TYPE_EXT,
> +				       PIN_PPS_CAPABILITIES, 1,
> +				       DPLL_PIN_FREQUENCY_1_HZ,
> +				       DPLL_PIN_FREQUENCY_1_HZ);
> +	if (err)
> +		goto pp_pps;
> +	dpll->p_pps =
> +		dpll_pin_get(clock_id, PIN_PPS, THIS_MODULE, &dpll->pp_pps);
> +	if (IS_ERR(dpll->p_pps)) {
> +		err = -EFAULT;
> +		goto p_pps;
> +	}
> +	nsim_fill_pin_pd(&dpll->p_pps_pd, DPLL_PIN_FREQUENCY_1_HZ,
> +			 PIN_PPS_PRIORITY, DPLL_PIN_DIRECTION_INPUT);
> +	err = dpll_pin_register(dpll->dpll_e, dpll->p_pps, &nsim_pin_ops,
> +				&dpll->p_pps_pd);
> +	if (err)
> +		goto e_pps_reg;
> +	err = dpll_pin_register(dpll->dpll_p, dpll->p_pps, &nsim_pin_ops,
> +				&dpll->p_pps_pd);
> +	if (err)
> +		goto p_pps_reg;
> +
> +	dpll->pp_rclk =
> +		kcalloc(ports_count, sizeof(*dpll->pp_rclk), GFP_KERNEL);
> +	dpll->p_rclk = kcalloc(ports_count, sizeof(*dpll->p_rclk), GFP_KERNEL);
> +	dpll->p_rclk_pd =
> +		kcalloc(ports_count, sizeof(*dpll->p_rclk_pd), GFP_KERNEL);
> +
> +	return 0;
> +
> +p_pps_reg:
> +	dpll_pin_unregister(dpll->dpll_e, dpll->p_pps, &nsim_pin_ops,
> +			    &dpll->p_pps_pd);
> +e_pps_reg:
> +	dpll_pin_put(dpll->p_pps);
> +p_pps:
> +	nsim_free_pin_properties(&dpll->pp_pps);
> +pp_pps:
> +	dpll_pin_unregister(dpll->dpll_e, dpll->p_gnss, &nsim_pin_ops,
> +			    &dpll->p_gnss_pd);
> +e_gnss_reg:
> +	dpll_pin_put(dpll->p_gnss);
> +p_gnss:
> +	nsim_free_pin_properties(&dpll->pp_gnss);
> +pp_gnss:
> +	dpll_device_unregister(dpll->dpll_p, &nsim_dds_ops, &dpll->dpll_p_pd);
> +p_reg:
> +	dpll_device_put(dpll->dpll_p);
> +dpll_p:
> +	dpll_device_unregister(dpll->dpll_e, &nsim_dds_ops, &dpll->dpll_e_pd);
> +e_reg:
> +	dpll_device_put(dpll->dpll_e);
> +	return err;
> +}

...

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