soc: qcom: stats: Populate all subsystem debugfs files

This driver relies on SMEM to populate items for each subsystem before
the device probes. The items in SMEM that are being looked for are
populated by the subsystems lazily, and therefore may not exist until
the device has booted. For example, if I build this driver into the
kernel on Trogdor Lazor and boot up, I don't see a 'modem' debugfs file
populated, because the modem boots and populates the SMEM item after
this driver probes.

Always populate the files for the subsystems if they're in SMEM, and
make the qcom_subsystem_sleep_stats_show() function return 0 if the SMEM
items still isn't there. This way we can run a simple command like

	grep ^ /sys/kernel/debug/qcom_stats/*

and collect the subsystem sleep stats without interspersed errors or
missing details entirely because this driver probed first.

Fixes: 1d772469 ("soc: qcom: Add Sleep stats driver")
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230119032329.2909383-1-swboyd@chromium.org

drivers/soc/qcom/qcom_stats.c

@@ -92,7 +92,7 @@ static int qcom_subsystem_sleep_stats_show(struct seq_file *s, void *unused)
 	/* Items are allocated lazily, so lookup pointer each time */
 	stat = qcom_smem_get(subsystem->pid, subsystem->smem_item, NULL);
 	if (IS_ERR(stat))
-		return -EIO;
+		return 0;
 
 	qcom_print_stats(s, stat);
 
@@ -170,20 +170,14 @@ static void qcom_create_soc_sleep_stat_files(struct dentry *root, void __iomem *
 static void qcom_create_subsystem_stat_files(struct dentry *root,
 					     const struct stats_config *config)
 {
-	const struct sleep_stats *stat;
 	int i;
 
 	if (!config->subsystem_stats_in_smem)
 		return;
 
-	for (i = 0; i < ARRAY_SIZE(subsystems); i++) {
-		stat = qcom_smem_get(subsystems[i].pid, subsystems[i].smem_item, NULL);
-		if (IS_ERR(stat))
-			continue;
-
+	for (i = 0; i < ARRAY_SIZE(subsystems); i++)
 		debugfs_create_file(subsystems[i].name, 0400, root, (void *)&subsystems[i],
 				    &qcom_subsystem_sleep_stats_fops);
-	}
 }
 
 static int qcom_stats_probe(struct platform_device *pdev)