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Message-Id: <404d8395cf4252c6fe6d98f317f3570127451778.1694693889.git.robin.murphy@arm.com>
Date: Fri, 15 Sep 2023 17:58:08 +0100
From: Robin Murphy <robin.murphy@....com>
To: joro@...tes.org, will@...nel.org
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, jgg@...dia.com,
baolu.lu@...ux.intel.com
Subject: [PATCH v3 4/7] iommu: Switch __iommu_domain_alloc() to device ops
In all the places we allocate default domains, we have (or can easily
get hold of) a device from which to resolve the right IOMMU ops; only
the public iommu_domain_alloc() interface actually depends on bus ops.
Reworking the public API is a big enough mission in its own right, but
in the meantime we can still decouple it from bus ops internally to move
forward.
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---
v3: Make sure blocking domains are covered as well
---
drivers/iommu/iommu.c | 50 +++++++++++++++++++++++++++++--------------
1 file changed, 34 insertions(+), 16 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f4cc91227b22..29ebb4b57df4 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -96,7 +96,7 @@ static const char * const iommu_group_resv_type_string[] = {
static int iommu_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data);
static void iommu_release_device(struct device *dev);
-static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
+static struct iommu_domain *__iommu_domain_alloc(struct device *dev,
unsigned type);
static int __iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
@@ -1745,12 +1745,11 @@ static int iommu_get_def_domain_type(struct device *dev)
}
static struct iommu_domain *
-__iommu_group_alloc_default_domain(const struct bus_type *bus,
- struct iommu_group *group, int req_type)
+__iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
{
if (group->default_domain && group->default_domain->type == req_type)
return group->default_domain;
- return __iommu_domain_alloc(bus, req_type);
+ return __iommu_domain_alloc(iommu_group_first_dev(group), req_type);
}
/*
@@ -1760,23 +1759,22 @@ __iommu_group_alloc_default_domain(const struct bus_type *bus,
static struct iommu_domain *
iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
{
- const struct bus_type *bus = iommu_group_first_dev(group)->bus;
struct iommu_domain *dom;
lockdep_assert_held(&group->mutex);
if (req_type)
- return __iommu_group_alloc_default_domain(bus, group, req_type);
+ return __iommu_group_alloc_default_domain(group, req_type);
/* The driver gave no guidance on what type to use, try the default */
- dom = __iommu_group_alloc_default_domain(bus, group, iommu_def_domain_type);
+ dom = __iommu_group_alloc_default_domain(group, iommu_def_domain_type);
if (dom)
return dom;
/* Otherwise IDENTITY and DMA_FQ defaults will try DMA */
if (iommu_def_domain_type == IOMMU_DOMAIN_DMA)
return NULL;
- dom = __iommu_group_alloc_default_domain(bus, group, IOMMU_DOMAIN_DMA);
+ dom = __iommu_group_alloc_default_domain(group, IOMMU_DOMAIN_DMA);
if (!dom)
return NULL;
@@ -1997,16 +1995,13 @@ void iommu_set_fault_handler(struct iommu_domain *domain,
}
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
-static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
+static struct iommu_domain *__iommu_domain_alloc(struct device *dev,
unsigned type)
{
- const struct iommu_ops *ops = bus ? bus->iommu_ops : NULL;
+ const struct iommu_ops *ops = dev_iommu_ops(dev);
struct iommu_domain *domain;
unsigned int alloc_type = type & IOMMU_DOMAIN_ALLOC_FLAGS;
- if (!ops)
- return NULL;
-
domain = ops->domain_alloc(alloc_type);
if (!domain)
return NULL;
@@ -2030,9 +2025,28 @@ static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
return domain;
}
+static int __iommu_domain_alloc_dev(struct device *dev, void *data)
+{
+ struct device **alloc_dev = data;
+
+ if (!dev_has_iommu(dev))
+ return 0;
+
+ WARN_ONCE(*alloc_dev && dev_iommu_ops(dev) != dev_iommu_ops(*alloc_dev),
+ "Multiple IOMMU drivers present, which the public IOMMU API can't fully support yet. You may still need to disable one or more to get the expected result here, sorry!\n");
+
+ *alloc_dev = dev;
+ return 0;
+}
+
struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
{
- return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
+ struct device *dev = NULL;
+
+ if (bus_for_each_dev(bus, NULL, &dev, __iommu_domain_alloc_dev))
+ return NULL;
+
+ return __iommu_domain_alloc(dev, IOMMU_DOMAIN_UNMANAGED);
}
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
@@ -3228,13 +3242,17 @@ static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
if (group->blocking_domain)
return 0;
- group->blocking_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_BLOCKED);
+ /* noiommu groups should never be here */
+ if (WARN_ON(!dev_has_iommu(dev)))
+ return -ENODEV;
+
+ group->blocking_domain = __iommu_domain_alloc(dev, IOMMU_DOMAIN_BLOCKED);
if (!group->blocking_domain) {
/*
* For drivers that do not yet understand IOMMU_DOMAIN_BLOCKED
* create an empty domain instead.
*/
- group->blocking_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_UNMANAGED);
+ group->blocking_domain = __iommu_domain_alloc(dev, IOMMU_DOMAIN_UNMANAGED);
if (!group->blocking_domain)
return -EINVAL;
}
--
2.39.2.101.g768bb238c484.dirty
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