Re: [PATCH v2 1/2] platform/x86/amd: pmc: Get STB DRAM size from PMFW

[Hans de Goede <hdegoede@redhat.com>]

Hi Shyam,

On 4/12/23 12:21, Shyam Sundar S K wrote:
> Recent PMFW's have support for querying the STB DRAM size. Add this
> support to the driver.
> 
> Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
> Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>

Please prepare a new version of this series addressing
Ilpo's review remarks.

Regards,

Hans






> ---
> v2:
>  - Based on review-hans branch
>  - Add a switch for cpu-id check based on feedback from Mario.
> 
>  drivers/platform/x86/amd/pmc.c | 32 +++++++++++++++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/pmc.c b/drivers/platform/x86/amd/pmc.c
> index 877b629e5cae..9f8bc6711413 100644
> --- a/drivers/platform/x86/amd/pmc.c
> +++ b/drivers/platform/x86/amd/pmc.c
> @@ -114,6 +114,7 @@ enum s2d_arg {
>  	S2D_PHYS_ADDR_LOW,
>  	S2D_PHYS_ADDR_HIGH,
>  	S2D_NUM_SAMPLES,
> +	S2D_DRAM_SIZE,
>  };
>  
>  struct amd_pmc_bit_map {
> @@ -146,6 +147,7 @@ struct amd_pmc_dev {
>  	u32 base_addr;
>  	u32 cpu_id;
>  	u32 active_ips;
> +	u32 dram_size;
>  /* SMU version information */
>  	u8 smu_program;
>  	u8 major;
> @@ -888,11 +890,34 @@ static const struct pci_device_id pmc_pci_ids[] = {
>  	{ }
>  };
>  
> +static int amd_pmc_get_dram_size(struct amd_pmc_dev *dev)
> +{
> +	switch (dev->cpu_id) {
> +	case AMD_CPU_ID_YC:
> +		if (!(dev->major > 90 || (dev->major == 90 && dev->minor > 39)))
> +			goto err_dram_size;
> +		break;
> +	default:
> +		goto err_dram_size;
> +	}
> +
> +	amd_pmc_send_cmd(dev, S2D_DRAM_SIZE, &dev->dram_size, STB_SPILL_TO_DRAM, 1);
> +	if (!dev->dram_size)
> +		goto err_dram_size;
> +
> +	return 0;
> +
> +err_dram_size:
> +	dev_err(dev->dev, "DRAM size command not supported for this platform\n");
> +	return -EINVAL;
> +}
> +
>  static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
>  {
>  	u32 phys_addr_low, phys_addr_hi;
>  	u64 stb_phys_addr;
>  	u32 size = 0;
> +	int ret;
>  
>  	/* Spill to DRAM feature uses separate SMU message port */
>  	dev->msg_port = 1;
> @@ -901,6 +926,11 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
>  	if (size != S2D_TELEMETRY_BYTES_MAX)
>  		return -EIO;
>  
> +	/* Get DRAM size */
> +	ret = amd_pmc_get_dram_size(dev);
> +	if (ret)
> +		dev->dram_size = S2D_TELEMETRY_DRAMBYTES_MAX;
> +
>  	/* Get STB DRAM address */
>  	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, STB_SPILL_TO_DRAM, 1);
>  	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, STB_SPILL_TO_DRAM, 1);
> @@ -910,7 +940,7 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
>  	/* Clear msg_port for other SMU operation */
>  	dev->msg_port = 0;
>  
> -	dev->stb_virt_addr = devm_ioremap(dev->dev, stb_phys_addr, S2D_TELEMETRY_DRAMBYTES_MAX);
> +	dev->stb_virt_addr = devm_ioremap(dev->dev, stb_phys_addr, dev->dram_size);
>  	if (!dev->stb_virt_addr)
>  		return -ENOMEM;
>