char *name;
int id;
struct iommu_domain *default_domain;
+ struct iommu_domain *domain;
};
struct iommu_device {
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
unsigned type);
+static int __iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev);
+static int __iommu_attach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
+static void __iommu_detach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
static ssize_t iommu_group_attr_show(struct kobject *kobj,
struct attribute *__attr, char *buf)
}
EXPORT_SYMBOL_GPL(iommu_group_set_name);
+static int iommu_group_create_direct_mappings(struct iommu_group *group,
+ struct device *dev)
+{
+ struct iommu_domain *domain = group->default_domain;
+ struct iommu_dm_region *entry;
+ struct list_head mappings;
+ unsigned long pg_size;
+ int ret = 0;
+
+ if (!domain || domain->type != IOMMU_DOMAIN_DMA)
+ return 0;
+
+ BUG_ON(!domain->ops->pgsize_bitmap);
+
+ pg_size = 1UL << __ffs(domain->ops->pgsize_bitmap);
+ INIT_LIST_HEAD(&mappings);
+
+ iommu_get_dm_regions(dev, &mappings);
+
+ /* We need to consider overlapping regions for different devices */
+ list_for_each_entry(entry, &mappings, list) {
+ dma_addr_t start, end, addr;
+
+ start = ALIGN(entry->start, pg_size);
+ end = ALIGN(entry->start + entry->length, pg_size);
+
+ for (addr = start; addr < end; addr += pg_size) {
+ phys_addr_t phys_addr;
+
+ phys_addr = iommu_iova_to_phys(domain, addr);
+ if (phys_addr)
+ continue;
+
+ ret = iommu_map(domain, addr, addr, pg_size, entry->prot);
+ if (ret)
+ goto out;
+ }
+
+ }
+
+out:
+ iommu_put_dm_regions(dev, &mappings);
+
+ return ret;
+}
+
/**
* iommu_group_add_device - add a device to an iommu group
* @group: the group into which to add the device (reference should be held)
dev->iommu_group = group;
+ iommu_group_create_direct_mappings(group, dev);
+
mutex_lock(&group->mutex);
list_add_tail(&device->list, &group->devices);
+ if (group->domain)
+ __iommu_attach_device(group->domain, dev);
mutex_unlock(&group->mutex);
/* Notify any listeners about change to group. */
* The group->mutex is held across callbacks, which will block calls to
* iommu_group_add/remove_device.
*/
-int iommu_group_for_each_dev(struct iommu_group *group, void *data,
- int (*fn)(struct device *, void *))
+static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
+ int (*fn)(struct device *, void *))
{
struct iommu_device *device;
int ret = 0;
- mutex_lock(&group->mutex);
list_for_each_entry(device, &group->devices, list) {
ret = fn(device->dev, data);
if (ret)
break;
}
+ return ret;
+}
+
+
+int iommu_group_for_each_dev(struct iommu_group *group, void *data,
+ int (*fn)(struct device *, void *))
+{
+ int ret;
+
+ mutex_lock(&group->mutex);
+ ret = __iommu_group_for_each_dev(group, data, fn);
mutex_unlock(&group->mutex);
+
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
/* No shared group found, allocate new */
group = iommu_group_alloc();
- if (group) {
- /*
- * Try to allocate a default domain - needs support from the
- * IOMMU driver.
- */
- group->default_domain = __iommu_domain_alloc(pdev->dev.bus,
- IOMMU_DOMAIN_DMA);
- }
+ if (IS_ERR(group))
+ return NULL;
+
+ /*
+ * Try to allocate a default domain - needs support from the
+ * IOMMU driver.
+ */
+ group->default_domain = __iommu_domain_alloc(pdev->dev.bus,
+ IOMMU_DOMAIN_DMA);
+ group->domain = group->default_domain;
return group;
}
return group;
}
+struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
+{
+ return group->default_domain;
+}
+
static int add_iommu_group(struct device *dev, void *data)
{
struct iommu_callback_data *cb = data;
if (iommu_group_device_count(group) != 1)
goto out_unlock;
- ret = __iommu_attach_device(domain, dev);
+ ret = __iommu_attach_group(domain, group);
out_unlock:
mutex_unlock(&group->mutex);
goto out_unlock;
}
- __iommu_detach_device(domain, dev);
+ __iommu_detach_group(domain, group);
out_unlock:
mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_detach_device);
+struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
+{
+ struct iommu_domain *domain;
+ struct iommu_group *group;
+
+ group = iommu_group_get(dev);
+ /* FIXME: Remove this when groups a mandatory for iommu drivers */
+ if (group == NULL)
+ return NULL;
+
+ domain = group->domain;
+
+ iommu_group_put(group);
+
+ return domain;
+}
+EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
+
/*
* IOMMU groups are really the natrual working unit of the IOMMU, but
* the IOMMU API works on domains and devices. Bridge that gap by
return __iommu_attach_device(domain, dev);
}
+static int __iommu_attach_group(struct iommu_domain *domain,
+ struct iommu_group *group)
+{
+ int ret;
+
+ if (group->default_domain && group->domain != group->default_domain)
+ return -EBUSY;
+
+ ret = __iommu_group_for_each_dev(group, domain,
+ iommu_group_do_attach_device);
+ if (ret == 0)
+ group->domain = domain;
+
+ return ret;
+}
+
int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
{
- return iommu_group_for_each_dev(group, domain,
- iommu_group_do_attach_device);
+ int ret;
+
+ mutex_lock(&group->mutex);
+ ret = __iommu_attach_group(domain, group);
+ mutex_unlock(&group->mutex);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(iommu_attach_group);
return 0;
}
+static void __iommu_detach_group(struct iommu_domain *domain,
+ struct iommu_group *group)
+{
+ int ret;
+
+ if (!group->default_domain) {
+ __iommu_group_for_each_dev(group, domain,
+ iommu_group_do_detach_device);
+ group->domain = NULL;
+ return;
+ }
+
+ if (group->domain == group->default_domain)
+ return;
+
+ /* Detach by re-attaching to the default domain */
+ ret = __iommu_group_for_each_dev(group, group->default_domain,
+ iommu_group_do_attach_device);
+ if (ret != 0)
+ WARN_ON(1);
+ else
+ group->domain = group->default_domain;
+}
+
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
{
- iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device);
+ mutex_lock(&group->mutex);
+ __iommu_detach_group(domain, group);
+ mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_detach_group);
return 0;
}
-arch_initcall(iommu_init);
+core_initcall(iommu_init);
int iommu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
return ret;
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
+
+void iommu_get_dm_regions(struct device *dev, struct list_head *list)
+{
+ const struct iommu_ops *ops = dev->bus->iommu_ops;
+
+ if (ops && ops->get_dm_regions)
+ ops->get_dm_regions(dev, list);
+}
+
+void iommu_put_dm_regions(struct device *dev, struct list_head *list)
+{
+ const struct iommu_ops *ops = dev->bus->iommu_ops;
+
+ if (ops && ops->put_dm_regions)
+ ops->put_dm_regions(dev, list);
+}
+
+/* Request that a device is direct mapped by the IOMMU */
+int iommu_request_dm_for_dev(struct device *dev)
+{
+ struct iommu_domain *dm_domain;
+ struct iommu_group *group;
+ int ret;
+
+ /* Device must already be in a group before calling this function */
+ group = iommu_group_get_for_dev(dev);
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+
+ mutex_lock(&group->mutex);
+
+ /* Check if the default domain is already direct mapped */
+ ret = 0;
+ if (group->default_domain &&
+ group->default_domain->type == IOMMU_DOMAIN_IDENTITY)
+ goto out;
+
+ /* Don't change mappings of existing devices */
+ ret = -EBUSY;
+ if (iommu_group_device_count(group) != 1)
+ goto out;
+
+ /* Allocate a direct mapped domain */
+ ret = -ENOMEM;
+ dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY);
+ if (!dm_domain)
+ goto out;
+
+ /* Attach the device to the domain */
+ ret = __iommu_attach_group(dm_domain, group);
+ if (ret) {
+ iommu_domain_free(dm_domain);
+ goto out;
+ }
+
+ /* Make the direct mapped domain the default for this group */
+ if (group->default_domain)
+ iommu_domain_free(group->default_domain);
+ group->default_domain = dm_domain;
+
+ pr_info("Using direct mapping for device %s\n", dev_name(dev));
+
+ ret = 0;
+out:
+ mutex_unlock(&group->mutex);
+ iommu_group_put(group);
+
+ return ret;
+}
projects / cascardo / linux.git / blobdiff