AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

iommu: Create direct mappings in default domains

Browse Source 
Use the information exported by the IOMMU drivers to create
direct mapped regions in the default domains.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-05-28 18:41:34 +02:00
parent a1015c2b99
commit beed2821b4
1 changed files with 48 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/iommu/iommu.c
View File

@ -325,6 +325,52 @@ int iommu_group_set_name(struct iommu_group *group, const char *name)
}
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)
@ -381,6 +427,8 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
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)