SMU provides a way to dump the s0ix debug statistics in the form of a
metrics table via a of set special mailbox commands.
Add support to the driver which can send these commands to SMU and expose
the information received via debugfs. The information contains the s0ix
entry/exit, active time of each IP block etc.
As a side note, SMU subsystem logging is not supported on Picasso based
SoC's.
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
v2: No change
v3: No change
v4: No change
v5: No change
drivers/platform/x86/amd-pmc.c | 147 +++++++++++++++++++++++++++++++--
1 file changed, 139 insertions(+), 8 deletions(-)
diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
index e5107e3b1911..0ebb2732c46a 100644
--- a/drivers/platform/x86/amd-pmc.c
+++ b/drivers/platform/x86/amd-pmc.c
@@ -46,6 +46,14 @@
#define AMD_PMC_RESULT_CMD_UNKNOWN 0xFE
#define AMD_PMC_RESULT_FAILED 0xFF
+/* SMU Message Definations */
+#define SMU_MSG_GETSMUVERSION 0x02
+#define SMU_MSG_LOG_GETDRAM_ADDR_HI 0x04
+#define SMU_MSG_LOG_GETDRAM_ADDR_LO 0x05
+#define SMU_MSG_LOG_START 0x06
+#define SMU_MSG_LOG_RESET 0x07
+#define SMU_MSG_LOG_DUMP_DATA 0x08
+#define SMU_MSG_GET_SUP_CONSTRAINTS 0x09
/* List of supported CPU ids */
#define AMD_CPU_ID_RV 0x15D0
#define AMD_CPU_ID_RN 0x1630
@@ -55,17 +63,42 @@
#define PMC_MSG_DELAY_MIN_US 100
#define RESPONSE_REGISTER_LOOP_MAX 200
+#define SOC_SUBSYSTEM_IP_MAX 12
+#define DELAY_MIN_US 2000
+#define DELAY_MAX_US 3000
enum amd_pmc_def {
MSG_TEST = 0x01,
MSG_OS_HINT_PCO,
MSG_OS_HINT_RN,
};
+struct amd_pmc_bit_map {
+ const char *name;
+ u32 bit_mask;
+};
+
+static const struct amd_pmc_bit_map soc15_ip_blk[] = {
+ {"DISPLAY", BIT(0)},
+ {"CPU", BIT(1)},
+ {"GFX", BIT(2)},
+ {"VDD", BIT(3)},
+ {"ACP", BIT(4)},
+ {"VCN", BIT(5)},
+ {"ISP", BIT(6)},
+ {"NBIO", BIT(7)},
+ {"DF", BIT(8)},
+ {"USB0", BIT(9)},
+ {"USB1", BIT(10)},
+ {"LAPIC", BIT(11)},
+ {}
+};
+
struct amd_pmc_dev {
void __iomem *regbase;
- void __iomem *smu_base;
+ void __iomem *smu_virt_addr;
u32 base_addr;
u32 cpu_id;
+ u32 active_ips;
struct device *dev;
struct mutex lock; /* generic mutex lock */
#if IS_ENABLED(CONFIG_DEBUG_FS)
@@ -74,6 +107,7 @@ struct amd_pmc_dev {
};
static struct amd_pmc_dev pmc;
+static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set, u32 *data, u8 msg, bool ret);
static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
{
@@ -85,9 +119,49 @@ static inline void amd_pmc_reg_write(struct amd_pmc_dev *dev, int reg_offset, u3
iowrite32(val, dev->regbase + reg_offset);
}
+struct smu_metrics {
+ u32 table_version;
+ u32 hint_count;
+ u32 s0i3_cyclecount;
+ u32 timein_s0i2;
+ u64 timeentering_s0i3_lastcapture;
+ u64 timeentering_s0i3_totaltime;
+ u64 timeto_resume_to_os_lastcapture;
+ u64 timeto_resume_to_os_totaltime;
+ u64 timein_s0i3_lastcapture;
+ u64 timein_s0i3_totaltime;
+ u64 timein_swdrips_lastcapture;
+ u64 timein_swdrips_totaltime;
+ u64 timecondition_notmet_lastcapture[SOC_SUBSYSTEM_IP_MAX];
+ u64 timecondition_notmet_totaltime[SOC_SUBSYSTEM_IP_MAX];
+} __packed;
+
#ifdef CONFIG_DEBUG_FS
static int smu_fw_info_show(struct seq_file *s, void *unused)
{
+ struct amd_pmc_dev *dev = s->private;
+ struct smu_metrics table;
+ int idx;
+
+ if (dev->cpu_id == AMD_CPU_ID_PCO)
+ return -EINVAL;
+
+ memcpy_fromio(&table, dev->smu_virt_addr, sizeof(struct smu_metrics));
+
+ seq_puts(s, "\n=== SMU Statistics ===\n");
+ seq_printf(s, "Table Version: %d\n", table.table_version);
+ seq_printf(s, "Hint Count: %d\n", table.hint_count);
+ seq_printf(s, "S0i3 Cycle Count: %d\n", table.s0i3_cyclecount);
+ seq_printf(s, "Time (in us) to S0i3: %lld\n", table.timeentering_s0i3_lastcapture);
+ seq_printf(s, "Time (in us) in S0i3: %lld\n", table.timein_s0i3_lastcapture);
+
+ seq_puts(s, "\n=== Active time (in us) ===\n");
+ for (idx = 0 ; idx < SOC_SUBSYSTEM_IP_MAX ; idx++) {
+ if (soc15_ip_blk[idx].bit_mask & dev->active_ips)
+ seq_printf(s, "%-8s : %lld\n", soc15_ip_blk[idx].name,
+ table.timecondition_notmet_lastcapture[idx]);
+ }
+
return 0;
}
DEFINE_SHOW_ATTRIBUTE(smu_fw_info);
@@ -113,6 +187,32 @@ static inline void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
}
#endif /* CONFIG_DEBUG_FS */
+static int amd_pmc_setup_smu_logging(struct amd_pmc_dev *dev)
+{
+ u32 phys_addr_low, phys_addr_hi;
+ u64 smu_phys_addr;
+
+ if (dev->cpu_id == AMD_CPU_ID_PCO)
+ return -EINVAL;
+
+ /* Get Active devices list from SMU */
+ amd_pmc_send_cmd(dev, 0, &dev->active_ips, SMU_MSG_GET_SUP_CONSTRAINTS, 1);
+
+ /* Get dram address */
+ amd_pmc_send_cmd(dev, 0, &phys_addr_low, SMU_MSG_LOG_GETDRAM_ADDR_LO, 1);
+ amd_pmc_send_cmd(dev, 0, &phys_addr_hi, SMU_MSG_LOG_GETDRAM_ADDR_HI, 1);
+ smu_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
+
+ dev->smu_virt_addr = devm_ioremap(dev->dev, smu_phys_addr, sizeof(struct smu_metrics));
+ if (!dev->smu_virt_addr)
+ return -ENOMEM;
+
+ /* Start the logging */
+ amd_pmc_send_cmd(dev, 0, NULL, SMU_MSG_LOG_START, 0);
+
+ return 0;
+}
+
static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
{
u32 value;
@@ -127,10 +227,9 @@ static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
dev_dbg(dev->dev, "AMD_PMC_REGISTER_MESSAGE:%x\n", value);
}
-static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set)
+static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set, u32 *data, u8 msg, bool ret)
{
int rc;
- u8 msg;
u32 val;
mutex_lock(&dev->lock);
@@ -150,8 +249,8 @@ static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set)
amd_pmc_reg_write(dev, AMD_PMC_REGISTER_ARGUMENT, set);
/* Write message ID to message ID register */
- msg = (dev->cpu_id == AMD_CPU_ID_RN) ? MSG_OS_HINT_RN : MSG_OS_HINT_PCO;
amd_pmc_reg_write(dev, AMD_PMC_REGISTER_MESSAGE, msg);
+
/* Wait until we get a valid response */
rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMC_REGISTER_RESPONSE,
val, val != 0, PMC_MSG_DELAY_MIN_US,
@@ -163,6 +262,11 @@ static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set)
switch (val) {
case AMD_PMC_RESULT_OK:
+ if (ret) {
+ /* PMFW may take longer time to return back the data */
+ usleep_range(DELAY_MIN_US, 10 * DELAY_MAX_US);
+ *data = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_ARGUMENT);
+ }
break;
case AMD_PMC_RESULT_CMD_REJECT_BUSY:
dev_err(dev->dev, "SMU not ready. err: 0x%x\n", val);
@@ -186,12 +290,29 @@ static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set)
return rc;
}
+static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
+{
+ switch (dev->cpu_id) {
+ case AMD_CPU_ID_PCO:
+ return MSG_OS_HINT_PCO;
+ case AMD_CPU_ID_RN:
+ return MSG_OS_HINT_RN;
+ }
+ return -EINVAL;
+}
+
static int __maybe_unused amd_pmc_suspend(struct device *dev)
{
struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
int rc;
+ u8 msg;
- rc = amd_pmc_send_cmd(pdev, 1);
+ /* Reset and Start SMU logging - to monitor the s0i3 stats */
+ amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_RESET, 0);
+ amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_START, 0);
+
+ msg = amd_pmc_get_os_hint(pdev);
+ rc = amd_pmc_send_cmd(pdev, 1, NULL, msg, 0);
if (rc)
dev_err(pdev->dev, "suspend failed\n");
@@ -202,8 +323,13 @@ static int __maybe_unused amd_pmc_resume(struct device *dev)
{
struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
int rc;
+ u8 msg;
- rc = amd_pmc_send_cmd(pdev, 0);
+ /* Let SMU know that we are looking for stats */
+ amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
+
+ msg = amd_pmc_get_os_hint(pdev);
+ rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, 0);
if (rc)
dev_err(pdev->dev, "resume failed\n");
@@ -226,8 +352,7 @@ static int amd_pmc_probe(struct platform_device *pdev)
{
struct amd_pmc_dev *dev = &pmc;
struct pci_dev *rdev;
- u32 base_addr_lo;
- u32 base_addr_hi;
+ u32 base_addr_lo, base_addr_hi;
u64 base_addr;
int err;
u32 val;
@@ -279,6 +404,12 @@ static int amd_pmc_probe(struct platform_device *pdev)
return -ENOMEM;
mutex_init(&dev->lock);
+
+ /* Use SMU to get the s0i3 debug stats */
+ err = amd_pmc_setup_smu_logging(dev);
+ if (err)
+ dev_err(dev->dev, "SMU debugging info not supported on this platform\n");
+
platform_set_drvdata(pdev, dev);
amd_pmc_dbgfs_register(dev);
return 0;
--
2.25.1
