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iommu: Add probe_device() and release_device() call-backs

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Add call-backs to 'struct iommu_ops' as an alternative to the
add_device() and remove_device() call-backs, which will be removed when
all drivers are converted.

The new call-backs will not setup IOMMU groups and domains anymore,
so also add a probe_finalize() call-back where the IOMMU driver can do
per-device setup work which require the device to be set up with a
group and a domain.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200429133712.31431-8-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-04-29 15:36:45 +02:00
parent 57bd2c24ba
commit a6a4c7e2c5
2 changed files with 66 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/iommu/iommu.c
View File

@ -174,6 +174,36 @@ static void dev_iommu_free(struct device *dev)
dev->iommu = NULL;
}
static int __iommu_probe_device(struct device *dev)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
struct iommu_device *iommu_dev;
struct iommu_group *group;
int ret;
iommu_dev = ops->probe_device(dev);
if (IS_ERR(iommu_dev))
return PTR_ERR(iommu_dev);
dev->iommu->iommu_dev = iommu_dev;
group = iommu_group_get_for_dev(dev);
if (!IS_ERR(group)) {
ret = PTR_ERR(group);
goto out_release;
}
iommu_group_put(group);
iommu_device_link(iommu_dev, dev);
return 0;
out_release:
ops->release_device(dev);
return ret;
}
int iommu_probe_device(struct device *dev)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
@ -191,10 +221,17 @@ int iommu_probe_device(struct device *dev)
goto err_free_dev_param;
}
ret = ops->add_device(dev);
if (ops->probe_device)
ret = __iommu_probe_device(dev);
else
ret = ops->add_device(dev);
if (ret)
goto err_module_put;
if (ops->probe_finalize)
ops->probe_finalize(dev);
return 0;
err_module_put:
@ -204,17 +241,31 @@ int iommu_probe_device(struct device *dev)
return ret;
}
static void __iommu_release_device(struct device *dev)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
iommu_device_unlink(dev->iommu->iommu_dev, dev);
iommu_group_remove_device(dev);
ops->release_device(dev);
}
void iommu_release_device(struct device *dev)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (dev->iommu_group)
if (!dev->iommu)
return;
if (ops->release_device)
__iommu_release_device(dev);
else if (dev->iommu_group)
ops->remove_device(dev);
if (dev->iommu) {
module_put(ops->owner);
dev_iommu_free(dev);
}
module_put(ops->owner);
dev_iommu_free(dev);
}
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,

9
include/linux/iommu.h
View File

@ -225,6 +225,10 @@ struct iommu_iotlb_gather {
* @iova_to_phys: translate iova to physical address
* @add_device: add device to iommu grouping
* @remove_device: remove device from iommu grouping
* @probe_device: Add device to iommu driver handling
* @release_device: Remove device from iommu driver handling
* @probe_finalize: Do final setup work after the device is added to an IOMMU
* group and attached to the groups domain
* @device_group: find iommu group for a particular device
* @domain_get_attr: Query domain attributes
* @domain_set_attr: Change domain attributes
@ -275,6 +279,9 @@ struct iommu_ops {
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
int (*add_device)(struct device *dev);
void (*remove_device)(struct device *dev);
struct iommu_device *(*probe_device)(struct device *dev);
void (*release_device)(struct device *dev);
void (*probe_finalize)(struct device *dev);
struct iommu_group *(*device_group)(struct device *dev);
int (*domain_get_attr)(struct iommu_domain *domain,
enum iommu_attr attr, void *data);
@ -375,6 +382,7 @@ struct iommu_fault_param {
*
* @fault_param: IOMMU detected device fault reporting data
* @fwspec: IOMMU fwspec data
* @iommu_dev: IOMMU device this device is linked to
* @priv: IOMMU Driver private data
*
* TODO: migrate other per device data pointers under iommu_dev_data, e.g.
@ -384,6 +392,7 @@ struct dev_iommu {
struct mutex lock;
struct iommu_fault_param *fault_param;
struct iommu_fwspec *fwspec;
struct iommu_device *iommu_dev;
void *priv;
};