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Subject[PATCH v2 2/4] platform/x86: intel_telemetry: Fix suspend stats
Date
Suspend stats are not reported consistently due to a limitation in the PMC
firmware. This limitation causes a delay in updating the s0ix counters and
residencies in the telemetry log upon s0ix exit. As a consequence, reading
these counters from the suspend-exit notifier may result in zero read.

This patch fixes this issue by cross-verifying the s0ix residencies from
the GCR TELEM registers in case the counters are not incremented in the
telemetry log after suspend.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=197833

We also remove unnecessary 'static' qualifiers from local variables.

Reported-and-tested-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Signed-off-by: Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>
---
drivers/platform/x86/intel_telemetry_debugfs.c | 29 ++++++++++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)

Changes since v1:
* Use pmc_ipc_gcr_readq API to read 64-bits at a time

diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c b/drivers/platform/x86/intel_telemetry_debugfs.c
index 4249e826..d7e90fd 100644
--- a/drivers/platform/x86/intel_telemetry_debugfs.c
+++ b/drivers/platform/x86/intel_telemetry_debugfs.c
@@ -855,9 +855,9 @@ static int pm_suspend_prep_cb(void)
static int pm_suspend_exit_cb(void)
{
struct telemetry_evtlog evtlog[TELEM_MAX_OS_ALLOCATED_EVENTS];
- static u32 suspend_shlw_ctr_exit, suspend_deep_ctr_exit;
- static u64 suspend_shlw_res_exit, suspend_deep_res_exit;
struct telemetry_debugfs_conf *conf = debugfs_conf;
+ u32 suspend_shlw_ctr_exit, suspend_deep_ctr_exit;
+ u64 suspend_shlw_res_exit, suspend_deep_res_exit;
int ret, index;

if (!suspend_prep_ok)
@@ -890,6 +890,31 @@ static int pm_suspend_exit_cb(void)
goto out;
}

+ /*
+ * Due to some design limitations in the firmware, sometimes the
+ * counters do not get updated by the time we reach here. As a
+ * workaround, we try to see if this was a genuine case of sleep
+ * failure or not by cross-checking from PMC GCR registers directly.
+ */
+ if (suspend_shlw_ctr_exit == suspend_shlw_ctr_temp &&
+ suspend_deep_ctr_exit == suspend_deep_ctr_temp) {
+ ret = intel_pmc_gcr_readq(PMC_GCR_TELEM_SHLW_S0IX_REG,
+ &suspend_shlw_res_exit);
+ if (ret < 0)
+ goto out;
+
+ ret = intel_pmc_gcr_readq(PMC_GCR_TELEM_DEEP_S0IX_REG,
+ &suspend_deep_res_exit);
+ if (ret < 0)
+ goto out;
+
+ if (suspend_shlw_res_exit > suspend_shlw_res_temp)
+ suspend_shlw_ctr_exit++;
+
+ if (suspend_deep_res_exit > suspend_deep_res_temp)
+ suspend_deep_ctr_exit++;
+ }
+
suspend_shlw_ctr_exit -= suspend_shlw_ctr_temp;
suspend_deep_ctr_exit -= suspend_deep_ctr_temp;
suspend_shlw_res_exit -= suspend_shlw_res_temp;
--
2.7.4
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