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SubjectRE: [PATCH 07/15] cxl/acpi: Check RCH's PCIe Host Bridge ACPI ID
Robert Richter wrote:
> An RCH is a root bridge and has "PNP0A08" or "ACPI0016" ACPI ID set.
> Check this.
>
> Signed-off-by: Robert Richter <rrichter@amd.com>
> ---
> drivers/cxl/acpi.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index a19e3154dd44..ffdf439adb87 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -312,9 +312,16 @@ static int add_root_nvdimm_bridge(struct device *match, void *data)
> return 1;
> }
>
> +static const struct acpi_device_id cxl_host_ids[] = {
> + { "ACPI0016", 0 },
> + { "PNP0A08", 0 },
> + { },
> +};
> +
> struct pci_host_bridge *cxl_find_next_rch(struct pci_host_bridge *host)
> {
> struct pci_bus *bus = host ? host->bus : NULL;
> + struct acpi_device *adev;
>
> while ((bus = pci_find_next_bus(bus)) != NULL) {
> host = bus ? to_pci_host_bridge(bus->bridge) : NULL;
> @@ -323,6 +330,19 @@ struct pci_host_bridge *cxl_find_next_rch(struct pci_host_bridge *host)
>
> dev_dbg(&host->dev, "PCI bridge found\n");
>
> + /* Must be a root bridge */
> + if (host->bus->parent)
> + continue;
> +
> + dev_dbg(&host->dev, "PCI bridge is root bridge\n");
> +
> + adev = ACPI_COMPANION(&host->dev);
> + if (acpi_match_device_ids(adev, cxl_host_ids))
> + continue;
> +
> + dev_dbg(&host->dev, "PCI ACPI host found: %s\n",
> + acpi_dev_name(adev));
> +

Again, finding all the ACPI0016 devices is add_host_bridge_dport()
already does.

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