Re: [PATCH v3] Common clock: To list active consumers of clocks

["<Vishal Badole>" <badolevishal1116@gmail.com>]

On Tue, Aug 02, 2022 at 11:39:47PM +0530, Vishal Badole wrote:
> This feature lists the clock consumer's name and per-user enable count
> in clock summary. Using this feature user can easily check which device
> has acquired a perticular clock and it is enabled by respective device
> or not.
> for example:
> $ cat /sys/kernel/debug/clk/clk_summary
>                       enable  prepare  protect                           duty  hardware                            per-user
>    clock               count    count    count    rate   accuracy phase cycle    enable   consumer                    count
> ----------------------------------------------------------------------------------------------------------------------------
>  clk_mcasp0_fixed         0        0        0    24576000      0     0  50000     Y      deviceless                      0
>                                                                                          deviceless                      0
>     clk_mcasp0            0        0        0    24576000      0     0  50000     N          simple-audio-card,cpu           0
>                                                                                              deviceless                      0
> 
> Co-developed-by: Chinmoy Ghosh <chinmoyghosh2001@gmail.com>
> Signed-off-by: Chinmoy Ghosh <chinmoyghosh2001@gmail.com>
> Co-developed-by: Mintu Patel <mintupatel89@gmail.com>
> Signed-off-by: Mintu Patel <mintupatel89@gmail.com>
> Co-developed-by: Vimal Kumar <vimal.kumar32@gmail.com>
> Signed-off-by: Vimal Kumar <vimal.kumar32@gmail.com>
> Signed-off-by: Vishal Badole <badolevishal1116@gmail.com>
> ---
>  drivers/clk/clk.c | 46 +++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 35 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index f00d4c1..c96079f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -102,6 +102,7 @@ struct clk {
>  	unsigned long min_rate;
>  	unsigned long max_rate;
>  	unsigned int exclusive_count;
> +	unsigned int enable_count;
>  	struct hlist_node clks_node;
>  };
>  
> @@ -1008,6 +1009,10 @@ void clk_disable(struct clk *clk)
>  		return;
>  
>  	clk_core_disable_lock(clk->core);
> +
> +	if (clk->enable_count > 0)
> +		clk->enable_count--;
> +
>  }
>  EXPORT_SYMBOL_GPL(clk_disable);
>  
> @@ -1169,10 +1174,16 @@ EXPORT_SYMBOL_GPL(clk_restore_context);
>   */
>  int clk_enable(struct clk *clk)
>  {
> +	int ret;
> +
>  	if (!clk)
>  		return 0;
>  
> -	return clk_core_enable_lock(clk->core);
> +	ret = clk_core_enable_lock(clk->core);
> +	if (!ret)
> +		clk->enable_count++;
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(clk_enable);
>  
> @@ -2953,28 +2964,41 @@ static void clk_summary_show_one(struct seq_file *s, struct clk_core *c,
>  				 int level)
>  {
>  	int phase;
> +	struct clk *clk_user;
> +	int multi_node = 0;
>  
> -	seq_printf(s, "%*s%-*s %7d %8d %8d %11lu %10lu ",
> +	seq_printf(s, "%*s%-*s %-7d %-8d %-8d %-11lu %-10lu ",
>  		   level * 3 + 1, "",
> -		   30 - level * 3, c->name,
> +		   35 - level * 3, c->name,
>  		   c->enable_count, c->prepare_count, c->protect_count,
>  		   clk_core_get_rate_recalc(c),
>  		   clk_core_get_accuracy_recalc(c));
>  
>  	phase = clk_core_get_phase(c);
>  	if (phase >= 0)
> -		seq_printf(s, "%5d", phase);
> +		seq_printf(s, "%-5d", phase);
>  	else
>  		seq_puts(s, "-----");
>  
> -	seq_printf(s, " %6d", clk_core_get_scaled_duty_cycle(c, 100000));
> +	seq_printf(s, " %-6d", clk_core_get_scaled_duty_cycle(c, 100000));
>  
>  	if (c->ops->is_enabled)
> -		seq_printf(s, " %9c\n", clk_core_is_enabled(c) ? 'Y' : 'N');
> +		seq_printf(s, " %5c ", clk_core_is_enabled(c) ? 'Y' : 'N');
>  	else if (!c->ops->enable)
> -		seq_printf(s, " %9c\n", 'Y');
> +		seq_printf(s, " %5c ", 'Y');
>  	else
> -		seq_printf(s, " %9c\n", '?');
> +		seq_printf(s, " %5c ", '?');
> +
> +	hlist_for_each_entry(clk_user, &c->clks, clks_node) {
> +		seq_printf(s, "%*s%-*s  %-4d\n",
> +			   level * 3 + 2 + 105 * multi_node, "",
> +			   30,
> +			   clk_user->dev_id ? clk_user->dev_id : "deviceless",
> +			   clk_user->enable_count);
> +
> +		multi_node = 1;
> +	}
> +
>  }
>  
>  static void clk_summary_show_subtree(struct seq_file *s, struct clk_core *c,
> @@ -2995,9 +3019,9 @@ static int clk_summary_show(struct seq_file *s, void *data)
>  	struct clk_core *c;
>  	struct hlist_head **lists = (struct hlist_head **)s->private;
>  
> -	seq_puts(s, "                                 enable  prepare  protect                                duty  hardware\n");
> -	seq_puts(s, "   clock                          count    count    count        rate   accuracy phase  cycle    enable\n");
> -	seq_puts(s, "-------------------------------------------------------------------------------------------------------\n");
> +	seq_puts(s, "                                 enable  prepare  protect                                duty  hardware                            per-user\n");
> +	seq_puts(s, "   clock                          count    count    count        rate   accuracy phase  cycle    enable   consumer                    count\n");
> +	seq_puts(s, "-------------------------------------------------------------------------------------------------------------------------------------------\n");
>  
>  	clk_prepare_lock();
>  
> -- 
> 2.7.4
>

Hi Stephen,
Please review the above patch. Here we have made the changes as per your
review points. 
Note: The example format in commit meassage is getting changed during
copy paste but we are getting proper formatted and parsable output on
actual target.


Regards,
Vishal