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iommu/vt-d: Introduce helper functions to improve code readability 

Introduce domain_type_is_vm() and domain_type_is_vm_or_si() to improve
code readability.

Also kill useless macro DOMAIN_FLAG_P2P_MULTIPLE_DEVICES.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jiang Liu 2014-07-11 14:19:27 +08:00 committed by Joerg Roedel
parent 18fd779a41
commit ab8dfe2515
1 changed files with 26 additions and 33 deletions
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59
drivers/iommu/intel-iommu.c
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@ -320,16 +320,13 @@ static inline int first_pte_in_page(struct dma_pte *pte)
static struct dmar_domain *si_domain;
static int hw_pass_through = 1;
/* devices under the same p2p bridge are owned in one domain */
#define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 << 0)
/* domain represents a virtual machine, more than one devices
* across iommus may be owned in one domain, e.g. kvm guest.
*/
#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 1)
#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 0)
/* si_domain contains mulitple devices */
#define DOMAIN_FLAG_STATIC_IDENTITY (1 << 2)
#define DOMAIN_FLAG_STATIC_IDENTITY (1 << 1)
/* define the limit of IOMMUs supported in each domain */
#ifdef CONFIG_X86
@ -539,6 +536,16 @@ void free_iova_mem(struct iova *iova)
kmem_cache_free(iommu_iova_cache, iova);
}
static inline int domain_type_is_vm(struct dmar_domain *domain)
{
return domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE;
}
static inline int domain_type_is_vm_or_si(struct dmar_domain *domain)
{
return domain->flags & (DOMAIN_FLAG_VIRTUAL_MACHINE |
DOMAIN_FLAG_STATIC_IDENTITY);
}
static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
{
@ -579,9 +586,7 @@ static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
int iommu_id;
/* si_domain and vm domain should not get here. */
BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE);
BUG_ON(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY);
BUG_ON(domain_type_is_vm_or_si(domain));
iommu_id = find_first_bit(domain->iommu_bmp, g_num_of_iommus);
if (iommu_id < 0 || iommu_id >= g_num_of_iommus)
return NULL;
@ -1497,7 +1502,7 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
free_context_table(iommu);
}
static struct dmar_domain *alloc_domain(bool vm)
static struct dmar_domain *alloc_domain(int flags)
{
/* domain id for virtual machine, it won't be set in context */
static atomic_t vm_domid = ATOMIC_INIT(0);
@ -1507,16 +1512,13 @@ static struct dmar_domain *alloc_domain(bool vm)
if (!domain)
return NULL;
memset(domain, 0, sizeof(*domain));
domain->nid = -1;
domain->iommu_count = 0;
memset(domain->iommu_bmp, 0, sizeof(domain->iommu_bmp));
domain->flags = 0;
domain->flags = flags;
spin_lock_init(&domain->iommu_lock);
INIT_LIST_HEAD(&domain->devices);
if (vm) {
if (flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
domain->id = atomic_inc_return(&vm_domid);
domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
}
return domain;
}
@ -1704,7 +1706,7 @@ static void domain_exit(struct dmar_domain *domain)
/* clear attached or cached domains */
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
if (domain_type_is_vm(domain) ||
test_bit(iommu->seq_id, domain->iommu_bmp))
iommu_detach_domain(domain, iommu);
rcu_read_unlock();
@ -1746,8 +1748,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
id = domain->id;
pgd = domain->pgd;
if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) {
if (domain_type_is_vm_or_si(domain)) {
int found = 0;
/* find an available domain id for this device in iommu */
@ -2094,7 +2095,7 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
iommu_disable_dev_iotlb(info);
iommu_detach_dev(info->iommu, info->bus, info->devfn);
if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) {
if (domain_type_is_vm(domain)) {
iommu_detach_dependent_devices(info->iommu, info->dev);
/* clear this iommu in iommu_bmp, update iommu count
* and capabilities
@ -2160,8 +2161,6 @@ static struct dmar_domain *dmar_insert_dev_info(struct intel_iommu *iommu,
info->dev = dev;
info->domain = domain;
info->iommu = iommu;
if (!dev)
domain->flags |= DOMAIN_FLAG_P2P_MULTIPLE_DEVICES;
spin_lock_irqsave(&device_domain_lock, flags);
if (dev)
@ -2233,7 +2232,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
}
/* Allocate and initialize new domain for the device */
domain = alloc_domain(false);
domain = alloc_domain(0);
if (!domain)
return NULL;
@ -2408,12 +2407,10 @@ static int __init si_domain_init(int hw)
struct intel_iommu *iommu;
int nid, ret = 0;
si_domain = alloc_domain(false);
si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY);
if (!si_domain)
return -EFAULT;
si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
for_each_active_iommu(iommu, drhd) {
ret = iommu_attach_domain(si_domain, iommu);
if (ret) {
@ -3860,9 +3857,7 @@ static int device_notifier(struct notifier_block *nb,
down_read(&dmar_global_lock);
domain_remove_one_dev_info(domain, dev);
if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
list_empty(&domain->devices))
if (!domain_type_is_vm_or_si(domain) && list_empty(&domain->devices))
domain_exit(domain);
up_read(&dmar_global_lock);
@ -4167,8 +4162,7 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
domain_update_iommu_cap(domain);
spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags);
if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY)) {
if (!domain_type_is_vm_or_si(domain)) {
spin_lock_irqsave(&iommu->lock, tmp_flags);
clear_bit(domain->id, iommu->domain_ids);
iommu->domains[domain->id] = NULL;
@ -4206,7 +4200,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
{
struct dmar_domain *dmar_domain;
dmar_domain = alloc_domain(true);
dmar_domain = alloc_domain(DOMAIN_FLAG_VIRTUAL_MACHINE);
if (!dmar_domain) {
printk(KERN_ERR
"intel_iommu_domain_init: dmar_domain == NULL\n");
@ -4250,8 +4244,7 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
old_domain = find_domain(dev);
if (old_domain) {
if (dmar_domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
dmar_domain->flags & DOMAIN_FLAG_STATIC_IDENTITY)
if (domain_type_is_vm_or_si(dmar_domain))
domain_remove_one_dev_info(old_domain, dev);
else
domain_remove_dev_info(old_domain);