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| author | Bjorn Helgaas <bhelgaas@google.com> | 2020-06-02 16:42:33 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-01-27 09:38:36 -0600 |
| commit | 508d392ae0bb3729d4c18628e021968a1b11b32c (patch) | |
| tree | 8a7f363cb66dc9896f861b5566b631efc6356e4c /drivers/acpi | |
| parent | 866e61fc40c96e7adba62c9e149e96912b10663c (diff) | |
| download | linux-508d392ae0bb3729d4c18628e021968a1b11b32c.tar.gz linux-508d392ae0bb3729d4c18628e021968a1b11b32c.tar.bz2 linux-508d392ae0bb3729d4c18628e021968a1b11b32c.zip | |
PCI/ACPI: Clarify message about _OSC failure
This message:
acpi PNP0A08:02: _OSC failed (AE_NOT_FOUND); disabling ASPM
is alarming and slightly misleading. Per the PCI Firmware Spec, r3.2, sec
4.5.1, _OSC is required for PCIe hierarchies. If _OSC is absent or fails,
the OS must not attempt to use any of the features defined for _OSC. That
includes native hotplug, native PME, AER, and other things as well as ASPM.
Rephrase the message to:
acpi PNP0A08:02: _OSC: platform retains control of PCIe features (AE_NOT_FOUND)
Previous discussion at https://lore.kernel.org/r/20200602223618.GA845676@bjorn-Precision-5520/
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/pci_root.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index ea08b3298e73..dcd593766a64 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -441,9 +441,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, if ((status == AE_NOT_FOUND) && !is_pcie) return; - dev_info(&device->dev, "_OSC failed (%s)%s\n", - acpi_format_exception(status), - pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); + dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", + acpi_format_exception(status)); return; } @@ -499,7 +498,7 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, } else { decode_osc_control(root, "OS requested", requested); decode_osc_control(root, "platform willing to grant", control); - dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", + dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", acpi_format_exception(status)); /* |