4.9-stable review patch. If anyone has any objections, please let me know.
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From: "Rafael J. Wysocki" rjw@rjwysocki.net
[ Upstream commit 5775b843a619b3c93f946e2b55a208d9f0f48b59 ]
We leave PCI devices not bound to a driver in D0 during runtime suspend. But they may have a parent which is bound and can be transitioned to D3cold at runtime. Once the parent goes to D3cold, the unbound child may go to D3cold as well. When the child goes to D3cold, its internal state, including configuration of BARs, MSI, ASPM, MPS, etc., is lost.
One example are recent hybrid graphics laptops which cut power to the discrete GPU when the root port above it goes to ACPI power state D3. Users may provoke this by unbinding the GPU driver and allowing runtime PM on the GPU via sysfs: The PM core will then treat the GPU as "suspended", which in turn allows the root port to runtime suspend, causing the power resources listed in its _PR3 object to be powered off. The GPU's BARs will be uninitialized when a driver later probes it.
Another example are hybrid graphics laptops where the GPU itself (rather than the root port) is capable of runtime suspending to D3cold. If the GPU's integrated HDA controller is not bound and the GPU's driver decides to runtime suspend to D3cold, the HDA controller's BARs will be uninitialized when a driver later probes it.
Fix by saving and restoring config space over a runtime suspend cycle even if the device is not bound.
Acked-by: Bjorn Helgaas bhelgaas@google.com Tested-by: Peter Wu peter@lekensteyn.nl # Nvidia Optimus Tested-by: Lukas Wunner lukas@wunner.de # MacBook Pro Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com [lukas: add commit message, bikeshed code comments for clarity] Signed-off-by: Lukas Wunner lukas@wunner.de Link: https://patchwork.freedesktop.org/patch/msgid/92fb6e6ae2730915eb733c08e2f76c... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/pci-driver.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1147,11 +1147,14 @@ static int pci_pm_runtime_suspend(struct int error;
/* - * If pci_dev->driver is not set (unbound), the device should - * always remain in D0 regardless of the runtime PM status + * If pci_dev->driver is not set (unbound), we leave the device in D0, + * but it may go to D3cold when the bridge above it runtime suspends. + * Save its config space in case that happens. */ - if (!pci_dev->driver) + if (!pci_dev->driver) { + pci_save_state(pci_dev); return 0; + }
if (!pm || !pm->runtime_suspend) return -ENOSYS; @@ -1199,16 +1202,18 @@ static int pci_pm_runtime_resume(struct const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
/* - * If pci_dev->driver is not set (unbound), the device should - * always remain in D0 regardless of the runtime PM status + * Restoring config space is necessary even if the device is not bound + * to a driver because although we left it in D0, it may have gone to + * D3cold when the bridge above it runtime suspended. */ + pci_restore_standard_config(pci_dev); + if (!pci_dev->driver) return 0;
if (!pm || !pm->runtime_resume) return -ENOSYS;
- pci_restore_standard_config(pci_dev); pci_fixup_device(pci_fixup_resume_early, pci_dev); __pci_enable_wake(pci_dev, PCI_D0, true, false); pci_fixup_device(pci_fixup_resume, pci_dev);