[PATCH 1/3] PCI: Add a flag to notify PCI drivers about powerdown during suspend

Manivannan Sadhasivam
2022-05-13T11:01:06Z

On some systems like Chromebooks based on Qcom chipsets, the OS may
powerdown all PCIe devices during system suspend for aggressive
powersaving. In that case, the PCI host controller drivers need to notify
the PCI device drivers that the power will be taken off during system
suspend so that the drivers can prepare the devices accordingly.

One prime example is the PCI NVMe driver. This flag can be used by the
driver to shutdown the NVMe device during suspend and recover it during
resume.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
include/linux/pci.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 60adf42460ab..069caf1fe88d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -578,6 +578,7 @@ struct pci_host_bridge {
unsigned int preserve_config:1; /* Preserve FW resource setup */
unsigned int size_windows:1; /* Enable root bus sizing */
unsigned int msi_domain:1; /* Bridge wants MSI domain */
+ unsigned int suspend_poweroff:1; /* OS may poweroff devices during system suspend */

/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,
--
2.25.1