linux-kernel - Re: [PATCH V3 1/2] platform/x86/amd/pmf: Introduce new interface to export NPU metrics

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Message-ID: <f404080d-b325-98c0-9fa1-2190ee2e0ed2@amd.com>
Date: Thu, 15 Jan 2026 08:49:01 -0800
From: Lizhi Hou <lizhi.hou@....com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC: <ogabbay@...nel.org>, <quic_jhugo@...cinc.com>,
	<maciej.falkowski@...ux.intel.com>, Hans de Goede <hansg@...nel.org>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>, <max.zhen@....com>,
	<sonal.santan@....com>, <mario.limonciello@....com>,
	<platform-driver-x86@...r.kernel.org>, <VinitKumar.Shukla@....com>, "Patil
 Rajesh Reddy" <Patil.Reddy@....com>
Subject: Re: [PATCH V3 1/2] platform/x86/amd/pmf: Introduce new interface to
 export NPU metrics


On 1/15/26 07:18, Ilpo Järvinen wrote:
> On Mon, 5 Jan 2026, Lizhi Hou wrote:
>
>> From: Shyam Sundar S K <Shyam-sundar.S-k@....com>
>>
>> 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@....com>
>> Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@....com>
>> Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@....com>
>> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
>> [lizhi: save return value of is_npu_metrics_supported() and return it]
>> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
>> ---
>>   drivers/platform/x86/amd/pmf/core.c | 76 +++++++++++++++++++++++++++++
>>   drivers/platform/x86/amd/pmf/pmf.h  |  2 +
>>   include/linux/amd-pmf-io.h          | 21 ++++++++
>>   3 files changed, 99 insertions(+)
>>
>> diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
>> index 8fc293c9c538..d180a39e03bf 100644
>> --- a/drivers/platform/x86/amd/pmf/core.c
>> +++ b/drivers/platform/x86/amd/pmf/core.c
>> @@ -8,12 +8,15 @@
>>    * Author: Shyam Sundar S K <Shyam-sundar.S-k@....com>
>>    */
>>   
>> +#include <linux/array_size.h>
>> +#include <linux/cleanup.h>
>>   #include <linux/debugfs.h>
>>   #include <linux/iopoll.h>
>>   #include <linux/module.h>
>>   #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"
>>   
>> @@ -53,6 +56,8 @@ 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);
>> @@ -314,6 +319,71 @@ 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_GPL(amd_pmf_get_npu_data);
> One more thing, the export should be namespaced.
>
> And since I'll be applying only this patch and not do an IB, can you also
> rebase it on top for the for-next branch.

Sure, I will send a V4 patch.

Lizhi

>