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iommu/vt-d: Keep track of per-iommu domain ids 

Instead of searching in the domain array for already
allocated domain ids, keep track of them explicitly.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-07-21 09:39:46 +02:00
parent 2238c0827a
commit c0e8a6c803
1 changed files with 29 additions and 25 deletions
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54
drivers/iommu/intel-iommu.c
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@ -378,6 +378,11 @@ struct dmar_domain {
DECLARE_BITMAP(iommu_bmp, DMAR_UNITS_SUPPORTED);
/* bitmap of iommus this domain uses*/
u16 iommu_did[DMAR_UNITS_SUPPORTED];
/* Domain ids per IOMMU. Use u16 since
* domain ids are 16 bit wide according
* to VT-d spec, section 9.3 */
struct list_head devices; /* all devices' list */
struct iova_domain iovad; /* iova's that belong to this domain */
@ -1543,11 +1548,13 @@ static int iommu_init_domains(struct intel_iommu *iommu)
}
/*
* if Caching mode is set, then invalid translations are tagged
* with domainid 0. Hence we need to pre-allocate it.
* If Caching mode is set, then invalid translations are tagged
* with domain-id 0, hence we need to pre-allocate it. We also
* use domain-id 0 as a marker for non-allocated domain-id, so
* make sure it is not used for a real domain.
*/
if (cap_caching_mode(iommu->cap))
set_bit(0, iommu->domain_ids);
set_bit(0, iommu->domain_ids);
return 0;
}
@ -1560,9 +1567,10 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
for_each_set_bit(i, iommu->domain_ids, cap_ndoms(iommu->cap)) {
/*
* Domain id 0 is reserved for invalid translation
* if hardware supports caching mode.
* if hardware supports caching mode and used as
* a non-allocated marker.
*/
if (cap_caching_mode(iommu->cap) && i == 0)
if (i == 0)
continue;
domain = iommu->domains[i];
@ -1624,6 +1632,7 @@ static int __iommu_attach_domain(struct dmar_domain *domain,
if (num < ndomains) {
set_bit(num, iommu->domain_ids);
iommu->domains[num] = domain;
domain->iommu_did[iommu->seq_id] = num;
} else {
num = -ENOSPC;
}
@ -1650,12 +1659,10 @@ static int iommu_attach_vm_domain(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
int num;
unsigned long ndomains;
ndomains = cap_ndoms(iommu->cap);
for_each_set_bit(num, iommu->domain_ids, ndomains)
if (iommu->domains[num] == domain)
return num;
num = domain->iommu_did[iommu->seq_id];
if (num)
return num;
return __iommu_attach_domain(domain, iommu);
}
@ -1664,22 +1671,18 @@ static void iommu_detach_domain(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
unsigned long flags;
int num, ndomains;
int num;
spin_lock_irqsave(&iommu->lock, flags);
if (domain_type_is_vm_or_si(domain)) {
ndomains = cap_ndoms(iommu->cap);
for_each_set_bit(num, iommu->domain_ids, ndomains) {
if (iommu->domains[num] == domain) {
clear_bit(num, iommu->domain_ids);
iommu->domains[num] = NULL;
break;
}
}
} else {
clear_bit(domain->id, iommu->domain_ids);
iommu->domains[domain->id] = NULL;
}
num = domain->iommu_did[iommu->seq_id];
if (num == 0)
return;
clear_bit(num, iommu->domain_ids);
iommu->domains[num] = NULL;
spin_unlock_irqrestore(&iommu->lock, flags);
}
@ -1708,6 +1711,7 @@ static int domain_detach_iommu(struct dmar_domain *domain,
if (test_and_clear_bit(iommu->seq_id, domain->iommu_bmp)) {
count = --domain->iommu_count;
domain_update_iommu_cap(domain);
domain->iommu_did[iommu->seq_id] = 0;
}
spin_unlock_irqrestore(&domain->iommu_lock, flags);