[PATCH v2] drm/amd/pm: Increase cache interval time

[Lazar, Lijo]

[Public]

Hi Asad,

Sorry, after initing the cache interval time, I meant to move the cache time check logic to swsmu level and not at smu v13.0.12. I believe this was the original ask from Alex.

Other SOCs can customize if required by adjusting the cache interval.

Thanks,
Lijo
________________________________
From: Kamal, Asad <Asad.Kamal at amd.com>
Sent: Tuesday, August 5, 2025 9:20:58 PM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; Lazar, Lijo <Lijo.Lazar at amd.com>
Cc: Zhang, Hawking <Hawking.Zhang at amd.com>; Ma, Le <Le.Ma at amd.com>; Zhang, Morris <Shiwu.Zhang at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Kamal, Asad <Asad.Kamal at amd.com>
Subject: [PATCH v2] drm/amd/pm: Increase cache interval time

Increase cache interval time to 50 ms while fetching system
metrics table for smu_v13_0_12 since polling interval is less frequent for
this data.

v2: Make caching interval soc independent, however customization can be
done in soc specific callbacks(Alex/Lijo)

Signed-off-by: Asad Kamal <asad.kamal at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c             | 4 ++++
 drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h         | 3 +++
 drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_12_ppt.c | 9 ++++-----
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index dc48a1dd8be4..c62d68d7410f 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -1162,8 +1162,12 @@ static void smu_free_dummy_read_table(struct smu_context *smu)

 static int smu_smc_table_sw_init(struct smu_context *smu)
 {
+       struct smu_table_context *smu_table = &smu->smu_table;
         int ret;

+       smu_table->tables[SMU_TABLE_TEMP_METRICS].cache_interval =
+               AMDGPU_TEMP_METRICS_CACHE_INTERVAL;
+
         /**
          * Create smu_table structure, and init smc tables such as
          * TABLE_PPTABLE, TABLE_WATERMARKS, TABLE_SMU_METRICS, and etc.
diff --git a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
index 611b381b9147..7a52c00c700e 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
@@ -32,6 +32,8 @@
 #include "smu_types.h"
 #include "linux/firmware.h"

+#define AMDGPU_TEMP_METRICS_CACHE_INTERVAL     50
+
 #define SMU_THERMAL_MINIMUM_ALERT_TEMP          0
 #define SMU_THERMAL_MAXIMUM_ALERT_TEMP          255
 #define SMU_TEMPERATURE_UNITS_PER_CENTIGRADES   1000
@@ -258,6 +260,7 @@ struct smu_table {
         struct amdgpu_bo *bo;
         uint32_t version;
         unsigned long  metrics_time;
+       uint32_t cache_interval;
 };

 enum smu_perf_level_designation {
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_12_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_12_ppt.c
index fca50f6a8ef6..5ead66375d38 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_12_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_12_ppt.c
@@ -361,18 +361,17 @@ int smu_v13_0_12_get_smu_metrics_data(struct smu_context *smu,
         return 0;
 }

-static int smu_v13_0_12_get_system_metrics_table(struct smu_context *smu, void *metrics_table,
-                                                bool bypass_cache)
+static int smu_v13_0_12_get_system_metrics_table(struct smu_context *smu, void *metrics_table)
 {
         struct smu_table_context *smu_table = &smu->smu_table;
         uint32_t table_size = smu_table->tables[SMU_TABLE_SMU_METRICS].size;
         struct smu_table *table = &smu_table->driver_table;
         int ret;

-       if (bypass_cache || !smu_table->tables[SMU_TABLE_TEMP_METRICS].metrics_time ||
+       if (!smu_table->tables[SMU_TABLE_TEMP_METRICS].metrics_time ||
             time_after(jiffies,
                        smu_table->tables[SMU_TABLE_TEMP_METRICS].metrics_time +
-                      msecs_to_jiffies(1))) {
+                      msecs_to_jiffies(smu_table->tables[SMU_TABLE_TEMP_METRICS].cache_interval))) {
                 ret = smu_cmn_send_smc_msg(smu, SMU_MSG_GetSystemMetricsTable, NULL);
                 if (ret) {
                         dev_info(smu->adev->dev,
@@ -544,7 +543,7 @@ static ssize_t smu_v13_0_12_get_temp_metrics(struct smu_context *smu,
         else if (type  == SMU_TEMP_METRIC_BASEBOARD)
                 smu_cmn_init_baseboard_temp_metrics(baseboard_temp_metrics, 1, 0);

-       ret = smu_v13_0_12_get_system_metrics_table(smu, metrics, false);
+       ret = smu_v13_0_12_get_system_metrics_table(smu, metrics);
         if (ret) {
                 kfree(metrics);
                 return ret;
--
2.46.0

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