From: Stephen Boyd swboyd@chromium.org
[ Upstream commit acdbf5f9b2c492505145f6e50c65418521a547c4 ]
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: 1d7724690344 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/qcom/qcom_stats.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c index 6228af057120b..c207bb96c523a 100644 --- a/drivers/soc/qcom/qcom_stats.c +++ b/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)