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path: root/drivers/platform/x86/amd-pmc.c
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Diffstat (limited to 'drivers/platform/x86/amd-pmc.c')
-rw-r--r--drivers/platform/x86/amd-pmc.c153
1 files changed, 144 insertions, 9 deletions
diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
index d6a7c896ac86..b7e50ed050a8 100644
--- a/drivers/platform/x86/amd-pmc.c
+++ b/drivers/platform/x86/amd-pmc.c
@@ -17,9 +17,11 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/iopoll.h>
+#include <linux/limits.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/rtc.h>
#include <linux/suspend.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
@@ -29,6 +31,10 @@
#define AMD_PMC_REGISTER_RESPONSE 0x980
#define AMD_PMC_REGISTER_ARGUMENT 0x9BC
+/* PMC Scratch Registers */
+#define AMD_PMC_SCRATCH_REG_CZN 0x94
+#define AMD_PMC_SCRATCH_REG_YC 0xD14
+
/* Base address of SMU for mapping physical address to virtual address */
#define AMD_PMC_SMU_INDEX_ADDRESS 0xB8
#define AMD_PMC_SMU_INDEX_DATA 0xBC
@@ -110,6 +116,10 @@ struct amd_pmc_dev {
u32 base_addr;
u32 cpu_id;
u32 active_ips;
+/* SMU version information */
+ u16 major;
+ u16 minor;
+ u16 rev;
struct device *dev;
struct mutex lock; /* generic mutex lock */
#if IS_ENABLED(CONFIG_DEBUG_FS)
@@ -118,7 +128,7 @@ 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 int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret);
static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
{
@@ -133,7 +143,7 @@ static inline void amd_pmc_reg_write(struct amd_pmc_dev *dev, int reg_offset, u3
struct smu_metrics {
u32 table_version;
u32 hint_count;
- u32 s0i3_cyclecount;
+ u32 s0i3_last_entry_status;
u32 timein_s0i2;
u64 timeentering_s0i3_lastcapture;
u64 timeentering_s0i3_totaltime;
@@ -147,6 +157,49 @@ struct smu_metrics {
u64 timecondition_notmet_totaltime[SOC_SUBSYSTEM_IP_MAX];
} __packed;
+static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev)
+{
+ int rc;
+ u32 val;
+
+ rc = amd_pmc_send_cmd(dev, 0, &val, SMU_MSG_GETSMUVERSION, 1);
+ if (rc)
+ return rc;
+
+ dev->major = (val >> 16) & GENMASK(15, 0);
+ dev->minor = (val >> 8) & GENMASK(7, 0);
+ dev->rev = (val >> 0) & GENMASK(7, 0);
+
+ dev_dbg(dev->dev, "SMU version is %u.%u.%u\n", dev->major, dev->minor, dev->rev);
+
+ return 0;
+}
+
+static int amd_pmc_idlemask_read(struct amd_pmc_dev *pdev, struct device *dev,
+ struct seq_file *s)
+{
+ u32 val;
+
+ switch (pdev->cpu_id) {
+ case AMD_CPU_ID_CZN:
+ val = amd_pmc_reg_read(pdev, AMD_PMC_SCRATCH_REG_CZN);
+ break;
+ case AMD_CPU_ID_YC:
+ val = amd_pmc_reg_read(pdev, AMD_PMC_SCRATCH_REG_YC);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (dev)
+ dev_dbg(pdev->dev, "SMU idlemask s0i3: 0x%x\n", val);
+
+ if (s)
+ seq_printf(s, "SMU idlemask : 0x%x\n", val);
+
+ return 0;
+}
+
#ifdef CONFIG_DEBUG_FS
static int smu_fw_info_show(struct seq_file *s, void *unused)
{
@@ -162,9 +215,12 @@ static int smu_fw_info_show(struct seq_file *s, void *unused)
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, "Last S0i3 Status: %s\n", table.s0i3_last_entry_status ? "Success" :
+ "Unknown/Fail");
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_printf(s, "Time (in us) to resume from S0i3: %lld\n",
+ table.timeto_resume_to_os_lastcapture);
seq_puts(s, "\n=== Active time (in us) ===\n");
for (idx = 0 ; idx < SOC_SUBSYSTEM_IP_MAX ; idx++) {
@@ -201,6 +257,23 @@ static int s0ix_stats_show(struct seq_file *s, void *unused)
}
DEFINE_SHOW_ATTRIBUTE(s0ix_stats);
+static int amd_pmc_idlemask_show(struct seq_file *s, void *unused)
+{
+ struct amd_pmc_dev *dev = s->private;
+ int rc;
+
+ if (dev->major > 56 || (dev->major >= 55 && dev->minor >= 37)) {
+ rc = amd_pmc_idlemask_read(dev, NULL, s);
+ if (rc)
+ return rc;
+ } else {
+ seq_puts(s, "Unsupported SMU version for Idlemask\n");
+ }
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(amd_pmc_idlemask);
+
static void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
{
debugfs_remove_recursive(dev->dbgfs_dir);
@@ -213,6 +286,8 @@ static void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
&smu_fw_info_fops);
debugfs_create_file("s0ix_stats", 0644, dev->dbgfs_dir, dev,
&s0ix_stats_fops);
+ debugfs_create_file("amd_pmc_idlemask", 0644, dev->dbgfs_dir, dev,
+ &amd_pmc_idlemask_fops);
}
#else
static inline void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
@@ -264,7 +339,7 @@ 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, u32 *data, u8 msg, bool ret)
+static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret)
{
int rc;
u32 val;
@@ -283,7 +358,7 @@ static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set, u32 *data, u8 msg
amd_pmc_reg_write(dev, AMD_PMC_REGISTER_RESPONSE, 0);
/* Write argument into response register */
- amd_pmc_reg_write(dev, AMD_PMC_REGISTER_ARGUMENT, set);
+ amd_pmc_reg_write(dev, AMD_PMC_REGISTER_ARGUMENT, arg);
/* Write message ID to message ID register */
amd_pmc_reg_write(dev, AMD_PMC_REGISTER_MESSAGE, msg);
@@ -339,18 +414,73 @@ static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
return -EINVAL;
}
+static int amd_pmc_verify_czn_rtc(struct amd_pmc_dev *pdev, u32 *arg)
+{
+ struct rtc_device *rtc_device;
+ time64_t then, now, duration;
+ struct rtc_wkalrm alarm;
+ struct rtc_time tm;
+ int rc;
+
+ if (pdev->major < 64 || (pdev->major == 64 && pdev->minor < 53))
+ return 0;
+
+ rtc_device = rtc_class_open("rtc0");
+ if (!rtc_device)
+ return 0;
+ rc = rtc_read_alarm(rtc_device, &alarm);
+ if (rc)
+ return rc;
+ if (!alarm.enabled) {
+ dev_dbg(pdev->dev, "alarm not enabled\n");
+ return 0;
+ }
+ rc = rtc_read_time(rtc_device, &tm);
+ if (rc)
+ return rc;
+ then = rtc_tm_to_time64(&alarm.time);
+ now = rtc_tm_to_time64(&tm);
+ duration = then-now;
+
+ /* in the past */
+ if (then < now)
+ return 0;
+
+ /* will be stored in upper 16 bits of s0i3 hint argument,
+ * so timer wakeup from s0i3 is limited to ~18 hours or less
+ */
+ if (duration <= 4 || duration > U16_MAX)
+ return -EINVAL;
+
+ *arg |= (duration << 16);
+ rc = rtc_alarm_irq_enable(rtc_device, 0);
+ dev_dbg(pdev->dev, "wakeup timer programmed for %lld seconds\n", duration);
+
+ return rc;
+}
+
static int __maybe_unused amd_pmc_suspend(struct device *dev)
{
struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
int rc;
u8 msg;
+ u32 arg = 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);
+ /* Activate CZN specific RTC functionality */
+ if (pdev->cpu_id == AMD_CPU_ID_CZN) {
+ rc = amd_pmc_verify_czn_rtc(pdev, &arg);
+ if (rc < 0)
+ return rc;
+ }
+
+ /* Dump the IdleMask before we send hint to SMU */
+ amd_pmc_idlemask_read(pdev, dev, NULL);
msg = amd_pmc_get_os_hint(pdev);
- rc = amd_pmc_send_cmd(pdev, 1, NULL, msg, 0);
+ rc = amd_pmc_send_cmd(pdev, arg, NULL, msg, 0);
if (rc)
dev_err(pdev->dev, "suspend failed\n");
@@ -363,14 +493,17 @@ static int __maybe_unused amd_pmc_resume(struct device *dev)
int rc;
u8 msg;
- /* 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");
+ /* Let SMU know that we are looking for stats */
+ amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
+
+ /* Dump the IdleMask to see the blockers */
+ amd_pmc_idlemask_read(pdev, dev, NULL);
+
return 0;
}
@@ -457,6 +590,7 @@ static int amd_pmc_probe(struct platform_device *pdev)
if (err)
dev_err(dev->dev, "SMU debugging info not supported on this platform\n");
+ amd_pmc_get_smu_version(dev);
platform_set_drvdata(pdev, dev);
amd_pmc_dbgfs_register(dev);
return 0;
@@ -476,6 +610,7 @@ static const struct acpi_device_id amd_pmc_acpi_ids[] = {
{"AMDI0006", 0},
{"AMDI0007", 0},
{"AMD0004", 0},
+ {"AMD0005", 0},
{ }
};
MODULE_DEVICE_TABLE(acpi, amd_pmc_acpi_ids);
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 09:16:35 +0000