PCI/ASPM: Warn when driver asks to disable ASPM, but we can't do it

Some devices have hardware problems related to using ASPM.  Drivers for
these devices use pci_disable_link_state() to prevent their device from
entering L0s or L1.  But on platforms where the OS doesn't have permission
to manage ASPM, pci_disable_link_state() doesn't actually disable ASPM.

Windows has a similar mechanism ("PciASPMOptOut"), and when the OS doesn't
have control of ASPM, it doesn't actually disable ASPM either.

This patch just adds a warning in dmesg about the fact that
pci_disable_link_state() is doing nothing.

Reported-by: Emmanuel Grumbach <egrumbach@gmail.com>
Reference: https://lkml.kernel.org/r/CANUX_P3F5YhbZX3WGU-j1AGpbXb_T9Bis2ErhvKkFMtDvzatVQ@mail.gmail.com
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57331
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index d320df6375a2..faa83b632a84 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -724,9 +724,6 @@ static void __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem,
         struct pci_dev *parent = pdev->bus->self;
         struct pcie_link_state *link;
 
-        if (aspm_disabled && !force)
-                return;
-
         if (!pci_is_pcie(pdev))
                 return;
 
@@ -736,6 +733,19 @@ static void __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem,
         if (!parent || !parent->link_state)
                 return;
 
+        /*
+         * A driver requested that ASPM be disabled on this device, but
+         * if we don't have permission to manage ASPM (e.g., on ACPI
+         * systems we have to observe the FADT ACPI_FADT_NO_ASPM bit and
+         * the _OSC method), we can't honor that request.  Windows has
+         * a similar mechanism using "PciASPMOptOut", which is also
+         * ignored in this situation.
+         */
+        if (aspm_disabled && !force) {
+                dev_warn(&pdev->dev, "can't disable ASPM; OS doesn't have ASPM control\n");
+                return;
+        }
+
         if (sem)
                 down_read(&pci_bus_sem);
         mutex_lock(&aspm_lock);