linux-kernel - [PATCH v3 4/5] PCI: aardvark: Implement driver 'remove' function and allow to build it as module

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Date:   Mon,  7 Sep 2020 13:10:37 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci@...r.kernel.org, Tomasz Maciej Nowak <tmn505@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Xogium <contact@...ium.me>, marek.behun@....cz
Subject: [PATCH v3 4/5] PCI: aardvark: Implement driver 'remove' function and allow to build it as module

Providing driver's 'remove' function allows kernel to bind and unbind devices
from aardvark driver. It also allows to build aardvark driver as a module.

Compiling aardvark as a module simplifies development and debugging of
this driver as it can be reloaded at runtime without the need to reboot
to new kernel.

Signed-off-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Marek Behún <marek.behun@....cz>
---
 drivers/pci/controller/Kconfig        |  2 +-
 drivers/pci/controller/pci-aardvark.c | 27 ++++++++++++++++++++++++---
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index f18c3725ef80..a7aa22512a92 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -12,7 +12,7 @@ config PCI_MVEBU
 	select PCI_BRIDGE_EMUL
 
 config PCI_AARDVARK
-	bool "Aardvark PCIe controller"
+	tristate "Aardvark PCIe controller"
 	depends on (ARCH_MVEBU && ARM64) || COMPILE_TEST
 	depends on OF
 	depends on PCI_MSI_IRQ_DOMAIN
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 2e2e2a2ff51d..b16822e344ab 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -14,6 +14,7 @@
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/phy/phy.h>
@@ -1121,6 +1122,7 @@ static int advk_pcie_probe(struct platform_device *pdev)
 
 	pcie = pci_host_bridge_priv(bridge);
 	pcie->pdev = pdev;
+	platform_set_drvdata(pdev, pcie);
 
 	pcie->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pcie->base))
@@ -1198,18 +1200,37 @@ static int advk_pcie_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int advk_pcie_remove(struct platform_device *pdev)
+{
+	struct advk_pcie *pcie = platform_get_drvdata(pdev);
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+
+	pci_lock_rescan_remove();
+	pci_stop_root_bus(bridge->bus);
+	pci_remove_root_bus(bridge->bus);
+	pci_unlock_rescan_remove();
+
+	advk_pcie_remove_msi_irq_domain(pcie);
+	advk_pcie_remove_irq_domain(pcie);
+
+	return 0;
+}
+
 static const struct of_device_id advk_pcie_of_match_table[] = {
 	{ .compatible = "marvell,armada-3700-pcie", },
 	{},
 };
+MODULE_DEVICE_TABLE(of, advk_pcie_of_match_table);
 
 static struct platform_driver advk_pcie_driver = {
 	.driver = {
 		.name = "advk-pcie",
 		.of_match_table = advk_pcie_of_match_table,
-		/* Driver unloading/unbinding currently not supported */
-		.suppress_bind_attrs = true,
 	},
 	.probe = advk_pcie_probe,
+	.remove = advk_pcie_remove,
 };
-builtin_platform_driver(advk_pcie_driver);
+module_platform_driver(advk_pcie_driver);
+
+MODULE_DESCRIPTION("Aardvark PCIe controller");
+MODULE_LICENSE("GPL v2");
-- 
2.20.1