Messages in this thread Patch in this message | | | From | ppwaskie@kernel ... | Subject | [PATCH 1/1] cxl/acpi.c: Add buggy BIOS hint for CXL ACPI lookup failure | Date | Sun, 7 Apr 2024 14:05:26 -0700 |
| |
From: PJ Waskiewicz <ppwaskie@kernel.org>
Currently, Type 3 CXL devices (CXL.mem) can train using host CXL drivers on Emerald Rapids systems. However, on some production systems from some vendors, a buggy BIOS exists that improperly populates the ACPI => PCI mappings. This leads to the cxl_acpi driver to fail probe when it cannot find the root port's _UID, in order to look up the device's CXL attributes in the CEDT.
Add a bit more of a descriptive message that the lookup failure could be a bad BIOS, rather than just "failed."
Signed-off-by: PJ Waskiewicz <ppwaskie@kernel.org> --- drivers/cxl/acpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index af5cb818f84d..56019466a09c 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -504,7 +504,7 @@ static int cxl_get_chbs(struct device *dev, struct acpi_device *hb, rc = acpi_evaluate_integer(hb->handle, METHOD_NAME__UID, NULL, &uid); if (rc != AE_OK) { - dev_err(dev, "unable to retrieve _UID\n"); + dev_err(dev, "unable to retrieve _UID. Potentially buggy BIOS\n"); return -ENOENT; } -- 2.40.1
| |