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iommu: Move default domain allocation to separate function 

Move the code out of iommu_group_get_for_dev() into a separate
function.

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/20200429133712.31431-2-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-04-29 15:36:39 +02:00
parent 6a8b55ed40
commit ff2a08b39b
1 changed files with 45 additions and 29 deletions
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74
drivers/iommu/iommu.c
View File

@ -1361,6 +1361,41 @@ struct iommu_group *fsl_mc_device_group(struct device *dev)
}
EXPORT_SYMBOL_GPL(fsl_mc_device_group);
static int iommu_alloc_default_domain(struct device *dev,
struct iommu_group *group)
{
struct iommu_domain *dom;
if (group->default_domain)
return 0;
dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
if (dom) {
dev_warn(dev,
"failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
iommu_def_domain_type);
}
}
if (!dom)
return -ENOMEM;
group->default_domain = dom;
if (!group->domain)
group->domain = dom;
if (!iommu_dma_strict) {
int attr = 1;
iommu_domain_set_attr(dom,
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
&attr);
}
return 0;
}
/**
* iommu_group_get_for_dev - Find or create the IOMMU group for a device
* @dev: target device
@ -1393,40 +1428,21 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
/*
* Try to allocate a default domain - needs support from the
* IOMMU driver.
* IOMMU driver. There are still some drivers which don't support
* default domains, so the return value is not yet checked.
*/
if (!group->default_domain) {
struct iommu_domain *dom;
dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
if (dom) {
dev_warn(dev,
"failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
iommu_def_domain_type);
}
}
group->default_domain = dom;
if (!group->domain)
group->domain = dom;
if (dom && !iommu_dma_strict) {
int attr = 1;
iommu_domain_set_attr(dom,
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
&attr);
}
}
iommu_alloc_default_domain(dev, group);
ret = iommu_group_add_device(group, dev);
if (ret) {
iommu_group_put(group);
return ERR_PTR(ret);
}
if (ret)
goto out_put_group;
return group;
out_put_group:
iommu_group_put(group);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(iommu_group_get_for_dev);