linux-kernel - Re: [PATCH] platform/x86/amd/pmf: Fix CnQF and auto-mode after resume

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Message-ID: <247af7d9-f6b1-def5-a138-780f567f48cb@redhat.com>
Date:   Mon, 15 May 2023 14:59:00 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Shyam-sundar.S-k@....com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86/amd/pmf: Fix CnQF and auto-mode after resume

Hi,

On 5/13/23 03:14, Mario Limonciello wrote:
> After suspend/resume cycle there is an error message and auto-mode
> or CnQF stops working.
> 
> [ 5741.447511] amd-pmf AMDI0100:00: SMU cmd failed. err: 0xff
> [ 5741.447523] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_RESPONSE:ff
> [ 5741.447527] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_ARGUMENT:7
> [ 5741.447531] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_MESSAGE:16
> [ 5741.447540] amd-pmf AMDI0100:00: [AUTO_MODE] avg power: 0 mW mode: QUIET
> 
> This is because the DRAM address used for accessing metrics table
> needs to be refreshed after a suspend resume cycle. Add a resume
> callback to reset this again.
> 
> Fixes: 1a409b35c995 ("platform/x86/amd/pmf: Get performance metrics from PMFW")
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Thank you for your patch, I've applied this patch to my fixes
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Note it will show up in my fixes branch once I've pushed my
local branch there, which might take a while.

I will include this patch in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans



> ---
>  drivers/platform/x86/amd/pmf/core.c | 32 ++++++++++++++++++++++-------
>  1 file changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
> index d5bb775dadcf..ee5f124f78b6 100644
> --- a/drivers/platform/x86/amd/pmf/core.c
> +++ b/drivers/platform/x86/amd/pmf/core.c
> @@ -245,24 +245,29 @@ static const struct pci_device_id pmf_pci_ids[] = {
>  	{ }
>  };
>  
> -int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
> +static void amd_pmf_set_dram_addr(struct amd_pmf_dev *dev)
>  {
>  	u64 phys_addr;
>  	u32 hi, low;
>  
> -	INIT_DELAYED_WORK(&dev->work_buffer, amd_pmf_get_metrics);
> +	phys_addr = virt_to_phys(dev->buf);
> +	hi = phys_addr >> 32;
> +	low = phys_addr & GENMASK(31, 0);
> +
> +	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_HIGH, 0, hi, NULL);
> +	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_LOW, 0, low, NULL);
> +}
>  
> +int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
> +{
>  	/* Get Metrics Table Address */
>  	dev->buf = kzalloc(sizeof(dev->m_table), GFP_KERNEL);
>  	if (!dev->buf)
>  		return -ENOMEM;
>  
> -	phys_addr = virt_to_phys(dev->buf);
> -	hi = phys_addr >> 32;
> -	low = phys_addr & GENMASK(31, 0);
> +	INIT_DELAYED_WORK(&dev->work_buffer, amd_pmf_get_metrics);
>  
> -	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_HIGH, 0, hi, NULL);
> -	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_LOW, 0, low, NULL);
> +	amd_pmf_set_dram_addr(dev);
>  
>  	/*
>  	 * Start collecting the metrics data after a small delay
> @@ -273,6 +278,18 @@ int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
>  	return 0;
>  }
>  
> +static int amd_pmf_resume_handler(struct device *dev)
> +{
> +	struct amd_pmf_dev *pdev = dev_get_drvdata(dev);
> +
> +	if (pdev->buf)
> +		amd_pmf_set_dram_addr(pdev);
> +
> +	return 0;
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(amd_pmf_pm, NULL, amd_pmf_resume_handler);
> +
>  static void amd_pmf_init_features(struct amd_pmf_dev *dev)
>  {
>  	int ret;
> @@ -413,6 +430,7 @@ static struct platform_driver amd_pmf_driver = {
>  		.name = "amd-pmf",
>  		.acpi_match_table = amd_pmf_acpi_ids,
>  		.dev_groups = amd_pmf_driver_groups,
> +		.pm = pm_sleep_ptr(&amd_pmf_pm),
>  	},
>  	.probe = amd_pmf_probe,
>  	.remove_new = amd_pmf_remove,