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iommu/arm-smmu-v3: Implement reserved region get/put callbacks 

The get() populates the list with the MSI IOVA reserved window.

At the moment an arbitray MSI IOVA window is set at 0x8000000
of size 1MB. This will allow to report those info in iommu-group
sysfs.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Eric Auger 2017-01-19 20:57:56 +00:00 committed by Will Deacon
parent f3ebee80b3
commit 50019f09a4
1 changed files with 28 additions and 0 deletions
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28
drivers/iommu/arm-smmu-v3.c
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@ -412,6 +412,9 @@
/* High-level queue structures */
#define ARM_SMMU_POLL_TIMEOUT_US 100
#define MSI_IOVA_BASE 0x8000000
#define MSI_IOVA_LENGTH 0x100000
static bool disable_bypass;
module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO);
MODULE_PARM_DESC(disable_bypass,
@ -1883,6 +1886,29 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
return iommu_fwspec_add_ids(dev, args->args, 1);
}
static void arm_smmu_get_resv_regions(struct device *dev,
struct list_head *head)
{
struct iommu_resv_region *region;
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
prot, IOMMU_RESV_MSI);
if (!region)
return;
list_add_tail(&region->list, head);
}
static void arm_smmu_put_resv_regions(struct device *dev,
struct list_head *head)
{
struct iommu_resv_region *entry, *next;
list_for_each_entry_safe(entry, next, head, list)
kfree(entry);
}
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@ -1898,6 +1924,8 @@ static struct iommu_ops arm_smmu_ops = {
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
.of_xlate = arm_smmu_of_xlate,
.get_resv_regions = arm_smmu_get_resv_regions,
.put_resv_regions = arm_smmu_put_resv_regions,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};