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Commit 55d94043 authored by Joerg Roedel's avatar Joerg Roedel
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iommu/vt-d: Get rid of domain->iommu_lock 

When this lock is held the device_domain_lock is also
required to make sure the device_domain_info does not vanish
while in use. So this lock can be removed as it gives no
additional protection.
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent de7e8886
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Inline Side-by-side
Showing with 49 additions and 38 deletions
drivers/iommu/intel-iommu.c
View file @ 55d94043
......@@ -406,7 +406,6 @@ struct dmar_domain {
int iommu_superpage;/* Level of superpages supported:
0 == 4KiB (no superpages), 1 == 2MiB,
2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
spinlock_t iommu_lock; /* protect iommu set in domain */
u64 max_addr; /* maximum mapped address */
struct iommu_domain domain; /* generic domain data structure for
......@@ -476,6 +475,8 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev);
static void domain_context_clear(struct intel_iommu *iommu,
struct device *dev);
static void __dmar_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev);
static int domain_detach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu);
......@@ -1404,24 +1405,23 @@ iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu,
u8 bus, u8 devfn)
{
bool found = false;
unsigned long flags;
struct device_domain_info *info;
struct pci_dev *pdev;
assert_spin_locked(&device_domain_lock);
if (!ecap_dev_iotlb_support(iommu->ecap))
return NULL;
if (!iommu->qi)
return NULL;
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry(info, &domain->devices, link)
if (info->iommu == iommu && info->bus == bus &&
info->devfn == devfn) {
found = true;
break;
}
spin_unlock_irqrestore(&device_domain_lock, flags);
if (!found || !info->dev || !dev_is_pci(info->dev))
return NULL;
......@@ -1616,10 +1616,12 @@ static int iommu_init_domains(struct intel_iommu *iommu)
static void disable_dmar_iommu(struct intel_iommu *iommu)
{
struct device_domain_info *info, *tmp;
unsigned long flags;
if (!iommu->domains || !iommu->domain_ids)
return;
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry_safe(info, tmp, &device_domain_list, global) {
struct dmar_domain *domain;
......@@ -1636,6 +1638,7 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
if (!domain_type_is_vm_or_si(domain))
domain_exit(domain);
}
spin_unlock_irqrestore(&device_domain_lock, flags);
if (iommu->gcmd & DMA_GCMD_TE)
iommu_disable_translation(iommu);
......@@ -1672,7 +1675,6 @@ static struct dmar_domain *alloc_domain(int flags)
memset(domain, 0, sizeof(*domain));
domain->nid = -1;
domain->flags = flags;
spin_lock_init(&domain->iommu_lock);
INIT_LIST_HEAD(&domain->devices);
return domain;
......@@ -1683,13 +1685,11 @@ static int domain_attach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
unsigned long ndomains;
unsigned long flags;
int ret, num;
int num;
assert_spin_locked(&device_domain_lock);
assert_spin_locked(&iommu->lock);
spin_lock_irqsave(&domain->iommu_lock, flags);
domain->iommu_refcnt[iommu->seq_id] += 1;
domain->iommu_count += 1;
if (domain->iommu_refcnt[iommu->seq_id] == 1) {
......@@ -1700,8 +1700,7 @@ static int domain_attach_iommu(struct dmar_domain *domain,
pr_err("%s: No free domain ids\n", iommu->name);
domain->iommu_refcnt[iommu->seq_id] -= 1;
domain->iommu_count -= 1;
ret = -ENOSPC;
goto out_unlock;
return -ENOSPC;
}
set_bit(num, iommu->domain_ids);
......@@ -1713,22 +1712,17 @@ static int domain_attach_iommu(struct dmar_domain *domain,
domain_update_iommu_cap(domain);
}
ret = 0;
out_unlock:
spin_unlock_irqrestore(&domain->iommu_lock, flags);
return ret;
return 0;
}
static int domain_detach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
int num, count = INT_MAX;
unsigned long flags;
assert_spin_locked(&device_domain_lock);
assert_spin_locked(&iommu->lock);
spin_lock_irqsave(&domain->iommu_lock, flags);
domain->iommu_refcnt[iommu->seq_id] -= 1;
count = --domain->iommu_count;
if (domain->iommu_refcnt[iommu->seq_id] == 0) {
......@@ -1739,7 +1733,6 @@ static int domain_detach_iommu(struct dmar_domain *domain,
domain_update_iommu_cap(domain);
domain->iommu_did[iommu->seq_id] = 0;
}
spin_unlock_irqrestore(&domain->iommu_lock, flags);
return count;
}
......@@ -1894,7 +1887,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
unsigned long flags;
struct dma_pte *pgd;
int agaw;
int ret, agaw;
WARN_ON(did == 0);
......@@ -1906,16 +1899,17 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
BUG_ON(!domain->pgd);
spin_lock_irqsave(&iommu->lock, flags);
spin_lock_irqsave(&device_domain_lock, flags);
spin_lock(&iommu->lock);
ret = -ENOMEM;
context = iommu_context_addr(iommu, bus, devfn, 1);
spin_unlock_irqrestore(&iommu->lock, flags);
if (!context)
return -ENOMEM;
spin_lock_irqsave(&iommu->lock, flags);
if (context_present(context)) {
spin_unlock_irqrestore(&iommu->lock, flags);
return 0;
}
goto out_unlock;
ret = 0;
if (context_present(context))
goto out_unlock;
pgd = domain->pgd;
......@@ -1928,11 +1922,10 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
*/
if (translation != CONTEXT_TT_PASS_THROUGH) {
for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
ret = -ENOMEM;
pgd = phys_to_virt(dma_pte_addr(pgd));
if (!dma_pte_present(pgd)) {
spin_unlock_irqrestore(&iommu->lock, flags);
return -ENOMEM;
}
if (!dma_pte_present(pgd))
goto out_unlock;
}
info = iommu_support_dev_iotlb(domain, iommu, bus, devfn);
......@@ -1971,7 +1964,12 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
iommu_flush_write_buffer(iommu);
}
iommu_enable_dev_iotlb(info);
spin_unlock_irqrestore(&iommu->lock, flags);
ret = 0;
out_unlock:
spin_unlock(&iommu->lock);
spin_unlock_irqrestore(&device_domain_lock, flags);
return 0;
}
......@@ -2214,9 +2212,12 @@ static inline void unlink_domain_info(struct device_domain_info *info)
static void domain_remove_dev_info(struct dmar_domain *domain)
{
struct device_domain_info *info, *tmp;
unsigned long flags;
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry_safe(info, tmp, &domain->devices, link)
dmar_remove_one_dev_info(domain, info->dev);
__dmar_remove_one_dev_info(domain, info->dev);
spin_unlock_irqrestore(&device_domain_lock, flags);
}
/*
......@@ -4539,7 +4540,7 @@ static void domain_context_clear(struct intel_iommu *iommu, struct device *dev)
pci_for_each_dma_alias(to_pci_dev(dev), &domain_context_clear_one_cb, iommu);
}
static void dmar_remove_one_dev_info(struct dmar_domain *domain,
static void __dmar_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev)
{
struct device_domain_info *info;
......@@ -4547,6 +4548,8 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
unsigned long flags;
u8 bus, devfn;
assert_spin_locked(&device_domain_lock);
iommu = device_to_iommu(dev, &bus, &devfn);
if (!iommu)
return;
......@@ -4556,9 +4559,7 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
if (WARN_ON(!info))
return;
spin_lock_irqsave(&device_domain_lock, flags);
unlink_domain_info(info);
spin_unlock_irqrestore(&device_domain_lock, flags);
iommu_disable_dev_iotlb(info);
domain_context_clear(iommu, dev);
......@@ -4569,6 +4570,16 @@ static void dmar_remove_one_dev_info(struct dmar_domain *domain,
spin_unlock_irqrestore(&iommu->lock, flags);
}
static void dmar_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev)
{
unsigned long flags;
spin_lock_irqsave(&device_domain_lock, flags);
__dmar_remove_one_dev_info(domain, dev);
spin_unlock_irqrestore(&device_domain_lock, flags);
}
static int md_domain_init(struct dmar_domain *domain, int guest_width)
{
int adjust_width;
......
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