Re: [PATCH 1/9] iommu/of: Drop early initialisation hooks

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Hi Jeffy,

On 2018-01-11 09:22, Jeffy Chen wrote:
With the probe-deferral mechanism, early initialisation hooks are no
longer needed.

Suggested-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---

  drivers/iommu/arm-smmu-v3.c  |  2 +-
  drivers/iommu/arm-smmu.c     | 12 ++++++------
  drivers/iommu/exynos-iommu.c |  2 +-

For Exynos IOMMU:
Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

IPMMU and MSM IOMMU are no longer multi-platform safe after this patch.
It breaks them in the same way as my commit 928055a01b3f ("iommu/exynos:
Remove custom platform device registration code") broke Exynos IOMMU.

You need a similar fix for them:
https://www.spinics.net/lists/arm-kernel/msg627648.html

  drivers/iommu/ipmmu-vmsa.c   | 17 ++---------------
  drivers/iommu/msm_iommu.c    | 24 +++++++-----------------
  drivers/iommu/of_iommu.c     | 16 ----------------
  drivers/iommu/qcom_iommu.c   |  2 +-
  include/linux/of_iommu.h     |  6 ++----
  8 files changed, 20 insertions(+), 61 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 744592d330ca..3f2f1fc68b52 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2971,7 +2971,7 @@ static struct platform_driver arm_smmu_driver = {
  };
  module_platform_driver(arm_smmu_driver);
-IOMMU_OF_DECLARE(arm_smmuv3, "arm,smmu-v3", NULL);
+IOMMU_OF_DECLARE(arm_smmuv3, "arm,smmu-v3");
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");
  MODULE_AUTHOR("Will Deacon <will.deacon@xxxxxxx>");
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 78d4c6b8f1ba..69e7c60792a8 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -2211,12 +2211,12 @@ static struct platform_driver arm_smmu_driver = {
  };
  module_platform_driver(arm_smmu_driver);
-IOMMU_OF_DECLARE(arm_smmuv1, "arm,smmu-v1", NULL);
-IOMMU_OF_DECLARE(arm_smmuv2, "arm,smmu-v2", NULL);
-IOMMU_OF_DECLARE(arm_mmu400, "arm,mmu-400", NULL);
-IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401", NULL);
-IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500", NULL);
-IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", NULL);
+IOMMU_OF_DECLARE(arm_smmuv1, "arm,smmu-v1");
+IOMMU_OF_DECLARE(arm_smmuv2, "arm,smmu-v2");
+IOMMU_OF_DECLARE(arm_mmu400, "arm,mmu-400");
+IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401");
+IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500");
+IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2");
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
  MODULE_AUTHOR("Will Deacon <will.deacon@xxxxxxx>");
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 79c45650f8de..1c7f926fad0e 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1394,4 +1394,4 @@ static int __init exynos_iommu_init(void)
  }
  core_initcall(exynos_iommu_init);
-IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu", NULL);
+IOMMU_OF_DECLARE(exynos_iommu_of, "samsung,exynos-sysmmu");
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 8dce3a9de9d8..07b711bb4b16 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -1081,12 +1081,8 @@ static struct platform_driver ipmmu_driver = {
static int __init ipmmu_init(void)
  {
-	static bool setup_done;
  	int ret;
- if (setup_done)
-		return 0;
-
  	ret = platform_driver_register(&ipmmu_driver);
  	if (ret < 0)
  		return ret;
@@ -1096,7 +1092,6 @@ static int __init ipmmu_init(void)
  		bus_set_iommu(&platform_bus_type, &ipmmu_ops);
  #endif
- setup_done = true;
  	return 0;
  }
@@ -1109,16 +1104,8 @@ subsys_initcall(ipmmu_init);
  module_exit(ipmmu_exit);
#ifdef CONFIG_IOMMU_DMA
-static int __init ipmmu_vmsa_iommu_of_setup(struct device_node *np)
-{
-	ipmmu_init();
-	return 0;
-}
-
-IOMMU_OF_DECLARE(ipmmu_vmsa_iommu_of, "renesas,ipmmu-vmsa",
-		 ipmmu_vmsa_iommu_of_setup);
-IOMMU_OF_DECLARE(ipmmu_r8a7795_iommu_of, "renesas,ipmmu-r8a7795",
-		 ipmmu_vmsa_iommu_of_setup);
+IOMMU_OF_DECLARE(ipmmu_vmsa_iommu_of, "renesas,ipmmu-vmsa");
+IOMMU_OF_DECLARE(ipmmu_r8a7795_iommu_of, "renesas,ipmmu-r8a7795");
  #endif
MODULE_DESCRIPTION("IOMMU API for Renesas VMSA-compatible IPMMU");
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 04f4d51ffacb..a41d4251b0a9 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -856,7 +856,7 @@ static struct platform_driver msm_iommu_driver = {
  	.remove		= msm_iommu_remove,
  };
-static int __init msm_iommu_driver_init(void)
+static int __init msm_iommu_init(void)
  {
  	int ret;
@@ -864,30 +864,20 @@ static int __init msm_iommu_driver_init(void)
  	if (ret != 0)
  		pr_err("Failed to register IOMMU driver\n");
+ bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
+
  	return ret;
  }
-static void __exit msm_iommu_driver_exit(void)
+static void __exit msm_iommu_exit(void)
  {
  	platform_driver_unregister(&msm_iommu_driver);
  }
-subsys_initcall(msm_iommu_driver_init);
-module_exit(msm_iommu_driver_exit);
-
-static int __init msm_iommu_init(void)
-{
-	bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
-	return 0;
-}
-
-static int __init msm_iommu_of_setup(struct device_node *np)
-{
-	msm_iommu_init();
-	return 0;
-}
+subsys_initcall(msm_iommu_init);
+module_exit(msm_iommu_exit);
-IOMMU_OF_DECLARE(msm_iommu_of, "qcom,apq8064-iommu", msm_iommu_of_setup);
+IOMMU_OF_DECLARE(msm_iommu_of, "qcom,apq8064-iommu");
MODULE_LICENSE("GPL v2");
  MODULE_AUTHOR("Stepan Moskovchenko <stepanm@xxxxxxxxxxxxxx>");
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 50947ebb6d17..5c36a8b7656a 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -231,19 +231,3 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
return ops;
  }
-
-static int __init of_iommu_init(void)
-{
-	struct device_node *np;
-	const struct of_device_id *match, *matches = &__iommu_of_table;
-
-	for_each_matching_node_and_match(np, matches, &match) {
-		const of_iommu_init_fn init_fn = match->data;
-
-		if (init_fn && init_fn(np))
-			pr_err("Failed to initialise IOMMU %pOF\n", np);
-	}
-
-	return 0;
-}
-postcore_initcall_sync(of_iommu_init);
diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index e07f02d00c68..65b9c99707f8 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -947,7 +947,7 @@ static void __exit qcom_iommu_exit(void)
  module_init(qcom_iommu_init);
  module_exit(qcom_iommu_exit);
-IOMMU_OF_DECLARE(qcom_iommu_dev, "qcom,msm-iommu-v1", NULL);
+IOMMU_OF_DECLARE(qcom_iommu_dev, "qcom,msm-iommu-v1");
MODULE_DESCRIPTION("IOMMU API for QCOM IOMMU v1 implementations");
  MODULE_LICENSE("GPL v2");
diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
index cddfaff4d0b7..ae03752e8e3a 100644
--- a/include/linux/of_iommu.h
+++ b/include/linux/of_iommu.h
@@ -34,9 +34,7 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
extern struct of_device_id __iommu_of_table; -typedef int (*of_iommu_init_fn)(struct device_node *);
-
-#define IOMMU_OF_DECLARE(name, compat, fn) \
-	_OF_DECLARE(iommu, name, compat, fn, of_iommu_init_fn)
+#define IOMMU_OF_DECLARE(name, compat) \
+	OF_DECLARE_1(iommu, name, compat, NULL)
#endif /* __OF_IOMMU_H */

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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