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From: Will Deacon <will@kernel.org>
To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Cc: "Isaac J. Manjarres" <isaacm@codeaurora.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Saravana Kannan <saravanak@google.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Will Deacon <will@kernel.org>
Subject: [PATCH v2 8/9] Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular"
Date: Fri,  8 Nov 2019 15:16:07 +0000
Message-ID: <20191108151608.20932-9-will@kernel.org> (raw)
In-Reply-To: <20191108151608.20932-1-will@kernel.org>

This reverts commit addb672f200f4e99368270da205320b83efe01a0.

Let's get the SMMU driver building as a module, which means putting
back some dead code that we used to carry.

Signed-off-by: Will Deacon <will@kernel.org>
---
 drivers/iommu/arm-smmu.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7c503a6bc585..53bbe0663b9e 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -27,8 +27,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
@@ -59,10 +58,6 @@
 #define MSI_IOVA_LENGTH			0x100000
 
 static int force_stage;
-/*
- * not really modular, but the easiest way to keep compat with existing
- * bootargs behaviour is to continue using module_param() here.
- */
 module_param(force_stage, int, S_IRUGO);
 MODULE_PARM_DESC(force_stage,
 	"Force SMMU mappings to be installed at a particular stage of translation. A value of '1' or '2' forces the corresponding stage. All other values are ignored (i.e. no stage is forced). Note that selecting a specific stage will disable support for nested translation.");
@@ -1878,6 +1873,7 @@ static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
 
 #ifdef CONFIG_ACPI
 static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
@@ -2165,12 +2161,12 @@ static int arm_smmu_legacy_bus_init(void)
 }
 device_initcall_sync(arm_smmu_legacy_bus_init);
 
-static void arm_smmu_device_shutdown(struct platform_device *pdev)
+static int arm_smmu_device_remove(struct platform_device *pdev)
 {
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
 	if (!smmu)
-		return;
+		return -ENODEV;
 
 	if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
 		dev_err(&pdev->dev, "removing device with active domains!\n");
@@ -2186,6 +2182,12 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
 		clk_bulk_disable(smmu->num_clks, smmu->clks);
 
 	clk_bulk_unprepare(smmu->num_clks, smmu->clks);
+	return 0;
+}
+
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+	arm_smmu_device_remove(pdev);
 }
 
 static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
@@ -2235,12 +2237,16 @@ static const struct dev_pm_ops arm_smmu_pm_ops = {
 
 static struct platform_driver arm_smmu_driver = {
 	.driver	= {
-		.name			= "arm-smmu",
-		.of_match_table		= of_match_ptr(arm_smmu_of_match),
-		.pm			= &arm_smmu_pm_ops,
-		.suppress_bind_attrs	= true,
+		.name		= "arm-smmu",
+		.of_match_table	= of_match_ptr(arm_smmu_of_match),
+		.pm		= &arm_smmu_pm_ops,
 	},
 	.probe	= arm_smmu_device_probe,
+	.remove	= arm_smmu_device_remove,
 	.shutdown = arm_smmu_device_shutdown,
 };
-builtin_platform_driver(arm_smmu_driver);
+module_platform_driver(arm_smmu_driver);
+
+MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
+MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog

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Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 15:15 [PATCH v2 0/9] iommu: Permit modular builds of ARM SMMU[v3] drivers Will Deacon
2019-11-08 15:16 ` [PATCH v2 1/9] drivers/iommu: Export core IOMMU API symbols to permit modular drivers Will Deacon
2019-11-08 15:16 ` [PATCH v2 2/9] iommu/of: Request ACS from the PCI core when configuring IOMMU linkage Will Deacon
2019-11-08 15:16 ` [PATCH v2 3/9] PCI: Export pci_ats_disabled() as a GPL symbol to modules Will Deacon
2019-11-08 15:16 ` [PATCH v2 4/9] drivers/iommu: Take a ref to the IOMMU driver prior to ->add_device() Will Deacon
2019-11-08 15:16 ` [PATCH v2 5/9] iommu/of: Take a ref to the IOMMU driver during ->of_xlate() Will Deacon
2019-11-08 15:16 ` [PATCH v2 6/9] Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular" Will Deacon
2019-11-08 16:17   ` John Garry
2019-11-08 16:44     ` John Garry
2019-11-08 16:47       ` Will Deacon
2019-11-08 17:25         ` John Garry
2019-11-08 17:32           ` Will Deacon
2019-11-08 17:48             ` Will Deacon
2019-11-08 18:00               ` John Garry
2019-11-08 17:49             ` John Garry
2019-11-08 15:16 ` [PATCH v2 7/9] iommu/arm-smmu-v3: Allow building as a module Will Deacon
2019-11-08 15:16 ` Will Deacon [this message]
2019-11-08 15:16 ` [PATCH v2 9/9] iommu/arm-smmu: " Will Deacon

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