linux-kernel - [PATCH v3] Common clock: To list active consumers of clocks

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Date:   Tue, 28 Jun 2022 10:38:42 +0530
From:   Vishal Badole <badolevishal1116@...il.com>
To:     sboyd@...nel.org
Cc:     mturquette@...libre.com, inux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, chinmoyghosh2001@...il.com,
        mintupatel89@...il.com, vimal.kumar32@...il.com,
        Vishal Badole <badolevishal1116@...il.com>
Subject: [PATCH v3] Common clock: To list active consumers of clocks

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:
debian@...glebone:~$ 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@...il.com>
Signed-off-by: Chinmoy Ghosh <chinmoyghosh2001@...il.com>
Co-developed-by: Mintu Patel <mintupatel89@...il.com>
Signed-off-by: Mintu Patel <mintupatel89@...il.com>
Co-developed-by: Vimal Kumar <vimal.kumar32@...il.com>
Signed-off-by: Vimal Kumar <vimal.kumar32@...il.com>
Signed-off-by: Vishal Badole <badolevishal1116@...il.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 ed11918..6c4249e 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;
 };
 
@@ -1015,6 +1016,10 @@ 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);
 
@@ -1176,10 +1181,16 @@ 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);
 
@@ -2960,28 +2971,41 @@ 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,
@@ -3002,9 +3026,9 @@ 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