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

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Date:   Fri, 13 May 2022 16:30:25 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     bhelgaas@...gle.com, lorenzo.pieralisi@....com, kbusch@...nel.org,
        hch@....de
Cc:     linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        svarbanov@...sol.com, bjorn.andersson@...aro.org, axboe@...com,
        quic_vbadigan@...cinc.com, quic_krichai@...cinc.com,
        quic_nitirawa@...cinc.com, vidyas@...dia.com, sagi@...mberg.me,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 1/3] PCI: Add a flag to notify PCI drivers about powerdown during suspend

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@...aro.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