Re: [PATCH v2 1/3] perf/dwc_pcie: Add support for Picoheart vendor devices

[Niklas Cassel <cassel@kernel.org>]

On Mon, Jun 29, 2026 at 05:27:15PM +0800, Yicong Yang wrote:
> Add PCI_VENDOR_ID_PICOHEART in pci_ids.h. Update the DWC PCIe
> vendor table with Picoheart PCIe vendorid to enable the PCIe
> PMU support.
> 
> Signed-off-by: Yicong Yang <yang.yicong@picoheart.com>
> ---
>  include/linux/pci_ids.h  | 2 ++
>  include/linux/pcie-dwc.h | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 1c9d40e09107..2c17239aacea 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -2640,6 +2640,8 @@
>  #define PCI_VENDOR_ID_SUNIX		0x1fd4
>  #define PCI_DEVICE_ID_SUNIX_1999	0x1999
>  
> +#define PCI_VENDOR_ID_PICOHEART		0x20fa
> +
>  #define PCI_VENDOR_ID_HINT             0x3388
>  #define PCI_DEVICE_ID_HINT_VXPROII_IDE 0x8013
>  
> diff --git a/include/linux/pcie-dwc.h b/include/linux/pcie-dwc.h
> index 8ff778e7aec0..b0ccb2ad74db 100644
> --- a/include/linux/pcie-dwc.h
> +++ b/include/linux/pcie-dwc.h
> @@ -32,6 +32,8 @@ static const struct dwc_pcie_vsec_id dwc_pcie_rasdes_vsec_ids[] = {
>  	  .vsec_id = 0x02, .vsec_rev = 0x4 },
>  	{ .vendor_id = PCI_VENDOR_ID_SAMSUNG,
>  	  .vsec_id = 0x02, .vsec_rev = 0x4 },
> +	{ .vendor_id = PCI_VENDOR_ID_PICOHEART,
> +	  .vsec_id = 0x02, .vsec_rev = 0x4 },

Could you please point to the in-tree device driver for this
DWC based "picoheart" PCIe controller?

$ git grep -i picoheart drivers/pci/controller/dwc/
<nothing>

It feels wrong to add PMU support for a PCIe controller,
if that PCIe controller does not have support in mainline.


Kind regards,
Niklas