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iommu/amd: Declare MSI and HT regions as reserved IOVA regions 

This patch registers the MSI and HT regions as non mappable
reserved regions. They will be exposed in the iommu-group sysfs.

For direct-mapped regions let's also use iommu_alloc_resv_region().

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Eric Auger 2017-01-19 20:57:54 +00:00 committed by Will Deacon
parent 0659b8dc45
commit 4397f32c03
1 changed files with 26 additions and 11 deletions
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37
drivers/iommu/amd_iommu.c
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@ -3164,6 +3164,7 @@ static bool amd_iommu_capable(enum iommu_cap cap)
static void amd_iommu_get_resv_regions(struct device *dev,
struct list_head *head)
{
struct iommu_resv_region *region;
struct unity_map_entry *entry;
int devid;
@ -3172,28 +3173,42 @@ static void amd_iommu_get_resv_regions(struct device *dev,
return;
list_for_each_entry(entry, &amd_iommu_unity_map, list) {
struct iommu_resv_region *region;
size_t length;
int prot = 0;
if (devid < entry->devid_start || devid > entry->devid_end)
continue;
region = kzalloc(sizeof(*region), GFP_KERNEL);
length = entry->address_end - entry->address_start;
if (entry->prot & IOMMU_PROT_IR)
prot |= IOMMU_READ;
if (entry->prot & IOMMU_PROT_IW)
prot |= IOMMU_WRITE;
region = iommu_alloc_resv_region(entry->address_start,
length, prot,
IOMMU_RESV_DIRECT);
if (!region) {
pr_err("Out of memory allocating dm-regions for %s\n",
dev_name(dev));
return;
}
region->start = entry->address_start;
region->length = entry->address_end - entry->address_start;
region->type = IOMMU_RESV_DIRECT;
if (entry->prot & IOMMU_PROT_IR)
region->prot |= IOMMU_READ;
if (entry->prot & IOMMU_PROT_IW)
region->prot |= IOMMU_WRITE;
list_add_tail(&region->list, head);
}
region = iommu_alloc_resv_region(MSI_RANGE_START,
MSI_RANGE_END - MSI_RANGE_START + 1,
0, IOMMU_RESV_RESERVED);
if (!region)
return;
list_add_tail(&region->list, head);
region = iommu_alloc_resv_region(HT_RANGE_START,
HT_RANGE_END - HT_RANGE_START + 1,
0, IOMMU_RESV_RESERVED);
if (!region)
return;
list_add_tail(&region->list, head);
}
static void amd_iommu_put_resv_regions(struct device *dev,