linux-kernel - [PATCH 5/5] PCI: Save and restore LTR state from pci_save/restore_pcie

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Date: Sun, 28 Jan 2024 15:32:12 -0800
From: "David E. Box" <david.e.box@...ux.intel.com>
To: mika.westerberg@...ux.intel.com,
	david.e.box@...ux.intel.com,
	ilpo.jarvinen@...ux.intel.com,
	bhelgaas@...gle.com,
	rjw@...ysocki.net
Cc: tasev.stefanoska@...net.be,
	enriquezmark36@...il.com,
	kernel@...t.link,
	wse@...edocomputers.com,
	vidyas@...dia.com,
	kai.heng.feng@...onical.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com,
	ricky_wu@...ltek.com,
	mario.limonciello@....com,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] PCI: Save and restore LTR state from pci_save/restore_pcie_state()

ASPM state is saved and restored from pci_save/restore_pcie_state().
Since the LTR Capability is linked with ASPM, move the LTR save and
restore calls there as well.

Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/pci/pci.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 61e56e040510..78c3c9d82b3b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1561,6 +1561,7 @@ static int pci_save_pcie_state(struct pci_dev *dev)
 	pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]);
 
 	pci_save_aspm_state(dev);
+	pci_save_ltr_state(dev);
 
 	return 0;
 }
@@ -1571,6 +1572,12 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
 	struct pci_cap_saved_state *save_state;
 	u16 *cap, val;
 
+	/*
+	 * Restore max latencies (in the LTR capability) before enabling
+	 * LTR itself (in the PCIe capability).
+	 */
+	pci_restore_ltr_state(dev);
+
 	save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
 	if (!save_state)
 		return;
@@ -1660,7 +1667,6 @@ int pci_save_state(struct pci_dev *dev)
 	if (i != 0)
 		return i;
 
-	pci_save_ltr_state(dev);
 	pci_save_dpc_state(dev);
 	pci_save_aer_state(dev);
 	pci_save_ptm_state(dev);
@@ -1761,12 +1767,6 @@ void pci_restore_state(struct pci_dev *dev)
 	if (!dev->state_saved)
 		return;
 
-	/*
-	 * Restore max latencies (in the LTR capability) before enabling
-	 * LTR itself (in the PCIe capability).
-	 */
-	pci_restore_ltr_state(dev);
-
 	pci_restore_pcie_state(dev);
 	pci_restore_pasid_state(dev);
 	pci_restore_pri_state(dev);
-- 
2.34.1