diff options
author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-07-11 06:19:27 (GMT) |
---|---|---|
committer | Joerg Roedel <jroedel@suse.de> | 2014-07-23 14:04:46 (GMT) |
commit | ab8dfe251571e4a04d367e47e5be93976a77c610 (patch) | |
tree | 585c9aac66db081f7f4911b571e577f108150feb /drivers/iommu | |
parent | 18fd779a41eff52b597bd2d327194f98a83de4af (diff) | |
download | linux-ab8dfe251571e4a04d367e47e5be93976a77c610.tar.xz |
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/intel-iommu.c | 59 |
1 files changed, 26 insertions, 33 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index d77009b..52250b3 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -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); |