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Subject[PATCH 07/15] cxl/acpi: Check RCH's PCIe Host Bridge ACPI ID
Date
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));
+
return host;
}

--
2.30.2
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