linux-kernel - [PATCH AUTOSEL 6.6 02/17] PCI: Use preserve_config in place of pci

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Message-ID: <20240728160709.2052627-2-sashal@kernel.org>
Date: Sun, 28 Jul 2024 12:06:38 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Vidya Sagar <vidyas@...dia.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sasha Levin <sashal@...nel.org>,
	will@...nel.org,
	lpieralisi@...nel.org,
	kw@...ux.com,
	linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 02/17] PCI: Use preserve_config in place of pci_flags

From: Vidya Sagar <vidyas@...dia.com>

[ Upstream commit 7246a4520b4bf1494d7d030166a11b5226f6d508 ]

Use preserve_config in place of checking for PCI_PROBE_ONLY flag to enable
support for "linux,pci-probe-only" on a per host bridge basis.

This also obviates the use of adding PCI_REASSIGN_ALL_BUS flag if
!PCI_PROBE_ONLY, as pci_assign_unassigned_root_bus_resources() takes care
of reassigning the resources that are not already claimed.

Link: https://lore.kernel.org/r/20240508174138.3630283-5-vidyas@nvidia.com
Signed-off-by: Vidya Sagar <vidyas@...dia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/pci-host-common.c |  4 ----
 drivers/pci/probe.c                      | 20 +++++++++-----------
 2 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index 6be3266cd7b5b..e2602e38ae452 100644
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -73,10 +73,6 @@ int pci_host_common_probe(struct platform_device *pdev)
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
 
-	/* Do not reassign resources if probe only */
-	if (!pci_has_flag(PCI_PROBE_ONLY))
-		pci_add_flags(PCI_REASSIGN_ALL_BUS);
-
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
 	bridge->msi_domain = true;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 43159965e09e9..217cf8a491eda 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3080,20 +3080,18 @@ int pci_host_probe(struct pci_host_bridge *bridge)
 
 	bus = bridge->bus;
 
+	/* If we must preserve the resource configuration, claim now */
+	if (bridge->preserve_config)
+		pci_bus_claim_resources(bus);
+
 	/*
-	 * We insert PCI resources into the iomem_resource and
-	 * ioport_resource trees in either pci_bus_claim_resources()
-	 * or pci_bus_assign_resources().
+	 * Assign whatever was left unassigned. If we didn't claim above,
+	 * this will reassign everything.
 	 */
-	if (pci_has_flag(PCI_PROBE_ONLY)) {
-		pci_bus_claim_resources(bus);
-	} else {
-		pci_bus_size_bridges(bus);
-		pci_bus_assign_resources(bus);
+	pci_assign_unassigned_root_bus_resources(bus);
 
-		list_for_each_entry(child, &bus->children, node)
-			pcie_bus_configure_settings(child);
-	}
+	list_for_each_entry(child, &bus->children, node)
+		pcie_bus_configure_settings(child);
 
 	pci_bus_add_devices(bus);
 	return 0;
-- 
2.43.0