platform/x86/amd/pmf: Introduce new interface to export NPU metrics

The PMF driver retrieves NPU metrics data from the PMFW. Introduce a new
interface to make NPU metrics accessible to other drivers like AMDXDNA
driver, which can access and utilize this information as needed.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
[lizhi: save return value of is_npu_metrics_supported() and return it]
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260115173448.403826-1-lizhi.hou@amd.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/platform/x86/amd/pmf/core.c

@@ -8,6 +8,8 @@
  * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
  */
 
+#include <linux/array_size.h>
+#include <linux/cleanup.h>
 #include <linux/debugfs.h>
 #include <linux/iopoll.h>
 #include <linux/module.h>
@@ -15,6 +17,7 @@
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
+#include <linux/string.h>
 #include <asm/amd/node.h>
 #include "pmf.h"
 
@@ -54,6 +57,8 @@ static bool force_load;
 module_param(force_load, bool, 0444);
 MODULE_PARM_DESC(force_load, "Force load this driver on supported older platforms (experimental)");
 
+static struct device *pmf_device;
+
 static int amd_pmf_pwr_src_notify_call(struct notifier_block *nb, unsigned long event, void *data)
 {
 	struct amd_pmf_dev *pmf = container_of(nb, struct amd_pmf_dev, pwr_src_notifier);
@@ -315,6 +320,71 @@ int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
 	return 0;
 }
 
+static int is_npu_metrics_supported(struct amd_pmf_dev *pdev)
+{
+	switch (pdev->cpu_id) {
+	case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
+	case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int amd_pmf_get_smu_metrics(struct amd_pmf_dev *dev, struct amd_pmf_npu_metrics *data)
+{
+	int ret, i;
+
+	guard(mutex)(&dev->metrics_mutex);
+
+	ret = is_npu_metrics_supported(dev);
+	if (ret)
+		return ret;
+
+	ret = amd_pmf_set_dram_addr(dev, true);
+	if (ret)
+		return ret;
+
+	memset(dev->buf, 0, dev->mtable_size);
+
+	/* Send SMU command to get NPU metrics */
+	ret = amd_pmf_send_cmd(dev, SET_TRANSFER_TABLE, SET_CMD, METRICS_TABLE_ID, NULL);
+	if (ret) {
+		dev_err(dev->dev, "SMU command failed to get NPU metrics: %d\n", ret);
+		return ret;
+	}
+
+	memcpy(&dev->m_table_v2, dev->buf, dev->mtable_size);
+
+	data->npuclk_freq = dev->m_table_v2.npuclk_freq;
+	for (i = 0; i < ARRAY_SIZE(data->npu_busy); i++)
+		data->npu_busy[i] = dev->m_table_v2.npu_busy[i];
+	data->npu_power = dev->m_table_v2.npu_power;
+	data->mpnpuclk_freq = dev->m_table_v2.mpnpuclk_freq;
+	data->npu_reads = dev->m_table_v2.npu_reads;
+	data->npu_writes = dev->m_table_v2.npu_writes;
+
+	return 0;
+}
+
+int amd_pmf_get_npu_data(struct amd_pmf_npu_metrics *info)
+{
+	struct amd_pmf_dev *pdev;
+
+	if (!info)
+		return -EINVAL;
+
+	if (!pmf_device)
+		return -ENODEV;
+
+	pdev = dev_get_drvdata(pmf_device);
+	if (!pdev)
+		return -ENODEV;
+
+	return amd_pmf_get_smu_metrics(pdev, info);
+}
+EXPORT_SYMBOL_NS_GPL(amd_pmf_get_npu_data, "AMD_PMF");
+
 static int amd_pmf_reinit_ta(struct amd_pmf_dev *pdev)
 {
 	bool status;
@@ -542,6 +612,10 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	if (err)
 		return err;
 
+	err = devm_mutex_init(dev->dev, &dev->metrics_mutex);
+	if (err)
+		return err;
+
 	apmf_acpi_init(dev);
 	platform_set_drvdata(pdev, dev);
 	amd_pmf_dbgfs_register(dev);
@@ -550,6 +624,8 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	if (is_apmf_func_supported(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2))
 		amd_pmf_notify_sbios_heartbeat_event_v2(dev, ON_LOAD);
 
+	pmf_device = dev->dev;
+
 	dev_info(dev->dev, "registered PMF device successfully\n");
 
 	return 0;

drivers/platform/x86/amd/pmf/pmf.h

@@ -12,6 +12,7 @@
 #define PMF_H
 
 #include <linux/acpi.h>
+#include <linux/amd-pmf-io.h>
 #include <linux/circ_buf.h>
 #include <linux/input.h>
 #include <linux/mutex_types.h>
@@ -440,6 +441,7 @@ struct amd_pmf_dev {
 	bool cb_flag;			     /* To handle first custom BIOS input */
 	struct pmf_cbi_ring_buffer cbi_buf;
 	struct mutex cbi_mutex;		     /* Protects ring buffer access */
+	struct mutex metrics_mutex;
 };
 
 struct apmf_sps_prop_granular_v2 {

include/linux/amd-pmf-io.h

@@ -61,5 +61,26 @@ enum laptop_placement {
 	LP_UNDEFINED,
 };
 
+/**
+ * struct amd_pmf_npu_metrics: Get NPU metrics data from PMF driver
+ * @npuclk_freq: NPU clock frequency [MHz]
+ * @npu_busy: NPU busy % [0-100]
+ * @npu_power: NPU power [mW]
+ * @mpnpuclk_freq: MPNPU [MHz]
+ * @npu_reads: NPU read bandwidth [MB/sec]
+ * @npu_writes: NPU write bandwidth [MB/sec]
+ */
+struct amd_pmf_npu_metrics {
+	u16 npuclk_freq;
+	u16 npu_busy[8];
+	u16 npu_power;
+	u16 mpnpuclk_freq;
+	u16 npu_reads;
+	u16 npu_writes;
+};
+
 int amd_get_sfh_info(struct amd_sfh_info *sfh_info, enum sfh_message_type op);
+
+/* AMD PMF and NPU interface */
+int amd_pmf_get_npu_data(struct amd_pmf_npu_metrics *info);
 #endif