linux-kernel - [PATCH v3 03/15] iommu: Always register bus notifiers

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Date:   Tue,  5 Jul 2022 18:08:26 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org
Cc:     will@...nel.org, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, baolu.lu@...ux.intel.com,
        suravee.suthikulpanit@....com, vasant.hegde@....com,
        mjrosato@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        schnelle@...ux.ibm.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 03/15] iommu: Always register bus notifiers

The number of bus types that the IOMMU subsystem deals with is small and
manageable, so pull that list into core code as a first step towards
cleaning up all the boilerplate bus-awareness from drivers. Calling
iommu_probe_device() before bus->iommu_ops is set will simply return
-ENODEV and not break the notifier call chain, so there should be no
harm in proactively registering all our bus notifiers at init time.

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---

v3: Add host1x_context_bus

 drivers/iommu/iommu.c | 53 ++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 847ad47a2dfd..514edc0eaa94 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -6,6 +6,7 @@
 
 #define pr_fmt(fmt)    "iommu: " fmt
 
+#include <linux/amba/bus.h>
 #include <linux/device.h>
 #include <linux/dma-iommu.h>
 #include <linux/kernel.h>
@@ -16,11 +17,13 @@
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/host1x_context_bus.h>
 #include <linux/iommu.h>
 #include <linux/idr.h>
 #include <linux/err.h>
 #include <linux/pci.h>
 #include <linux/bitops.h>
+#include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/fsl/mc.h>
 #include <linux/module.h>
@@ -75,6 +78,7 @@ static const char * const iommu_group_resv_type_string[] = {
 #define IOMMU_CMD_LINE_DMA_API		BIT(0)
 #define IOMMU_CMD_LINE_STRICT		BIT(1)
 
+static int iommu_bus_init(struct bus_type *bus);
 static int iommu_alloc_default_domain(struct iommu_group *group,
 				      struct device *dev);
 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
@@ -103,6 +107,22 @@ struct iommu_group_attribute iommu_group_attr_##_name =		\
 static LIST_HEAD(iommu_device_list);
 static DEFINE_SPINLOCK(iommu_device_lock);
 
+static struct bus_type * const iommu_buses[] = {
+	&platform_bus_type,
+#ifdef CONFIG_PCI
+	&pci_bus_type,
+#endif
+#ifdef CONFIG_ARM_AMBA
+	&amba_bustype,
+#endif
+#ifdef CONFIG_FSL_MC_BUS
+	&fsl_mc_bus_type,
+#endif
+#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
+	&host1x_context_device_bus_type,
+#endif
+};
+
 /*
  * Use a function instead of an array here because the domain-type is a
  * bit-field, so an array would waste memory.
@@ -152,6 +172,10 @@ static int __init iommu_subsys_init(void)
 			(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
 				"(set via kernel command line)" : "");
 
+	/* If the system is so broken that this fails, it will WARN anyway */
+	for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++)
+		iommu_bus_init(iommu_buses[i]);
+
 	return 0;
 }
 subsys_initcall(iommu_subsys_init);
@@ -1772,35 +1796,19 @@ int bus_iommu_probe(struct bus_type *bus)
 	return ret;
 }
 
-static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
+static int iommu_bus_init(struct bus_type *bus)
 {
 	struct notifier_block *nb;
 	int err;
 
-	nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
+	nb = kzalloc(sizeof(*nb), GFP_KERNEL);
 	if (!nb)
 		return -ENOMEM;
 
 	nb->notifier_call = iommu_bus_notifier;
-
 	err = bus_register_notifier(bus, nb);
 	if (err)
-		goto out_free;
-
-	err = bus_iommu_probe(bus);
-	if (err)
-		goto out_err;
-
-
-	return 0;
-
-out_err:
-	/* Clean up */
-	bus_for_each_dev(bus, NULL, NULL, remove_iommu_group);
-	bus_unregister_notifier(bus, nb);
-
-out_free:
-	kfree(nb);
+		kfree(nb);
 
 	return err;
 }
@@ -1833,9 +1841,12 @@ int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
 	bus->iommu_ops = ops;
 
 	/* Do IOMMU specific setup for this bus-type */
-	err = iommu_bus_init(bus, ops);
-	if (err)
+	err = bus_iommu_probe(bus);
+	if (err) {
+		/* Clean up */
+		bus_for_each_dev(bus, NULL, NULL, remove_iommu_group);
 		bus->iommu_ops = NULL;
+	}
 
 	return err;
 }
-- 
2.36.1.dirty