linux-kernel - [PATCH v2 8/8] PCI: dw: Add support for PCI_PROBE_ONLY/PCI_REASSIGN_ALL

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Message-ID: <20190718094718.25083-4-jonnyc@amazon.com>
Date:   Thu, 18 Jul 2019 12:47:18 +0300
From:   Jonathan Chocron <jonnyc@...zon.com>
To:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <dwmw@...zon.co.uk>, <benh@...nel.crashing.org>,
        <alisaidi@...zon.com>, <ronenk@...zon.com>, <barakw@...zon.com>,
        <talel@...zon.com>, <hanochu@...zon.com>, <hhhawa@...zon.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <jonnyc@...zon.com>
Subject: [PATCH v2 8/8] PCI: dw: Add support for PCI_PROBE_ONLY/PCI_REASSIGN_ALL_BUS flags

This basically aligns the usage of PCI_PROBE_ONLY and
PCI_REASSIGN_ALL_BUS in dw_pcie_host_init() with the logic in
pci_host_common_probe().

Now it will be possible to control via the devicetree whether to just
probe the PCI bus (in cases where FW already configured it) or to fully
configure it.

Signed-off-by: Jonathan Chocron <jonnyc@...zon.com>
---
 .../pci/controller/dwc/pcie-designware-host.c | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index d2ca748e4c85..0a294d8aa21a 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -342,6 +342,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	if (!bridge)
 		return -ENOMEM;
 
+	of_pci_check_probe_only();
+
 	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
 					&bridge->windows, &pp->io_base);
 	if (ret)
@@ -474,6 +476,10 @@ int dw_pcie_host_init(struct pcie_port *pp)
 
 	pp->root_bus_nr = pp->busn->start;
 
+	/* Do not reassign bus nums if probe only */
+	if (!pci_has_flag(PCI_PROBE_ONLY))
+		pci_add_flags(PCI_REASSIGN_ALL_BUS);
+
 	bridge->dev.parent = dev;
 	bridge->sysdata = pp;
 	bridge->busnr = pp->root_bus_nr;
@@ -490,11 +496,20 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	if (pp->ops->scan_bus)
 		pp->ops->scan_bus(pp);
 
-	pci_bus_size_bridges(pp->root_bus);
-	pci_bus_assign_resources(pp->root_bus);
+	/*
+	 * We insert PCI resources into the iomem_resource and
+	 * ioport_resource trees in either pci_bus_claim_resources()
+	 * or pci_bus_assign_resources().
+	 */
+	if (pci_has_flag(PCI_PROBE_ONLY)) {
+		pci_bus_claim_resources(pp->root_bus);
+	} else {
+		pci_bus_size_bridges(pp->root_bus);
+		pci_bus_assign_resources(pp->root_bus);
 
-	list_for_each_entry(child, &pp->root_bus->children, node)
-		pcie_bus_configure_settings(child);
+		list_for_each_entry(child, &pp->root_bus->children, node)
+			pcie_bus_configure_settings(child);
+	}
 
 	pci_bus_add_devices(pp->root_bus);
 	return 0;
-- 
2.17.1