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iommu/vt-d: Reduce duplicated code to handle virtual machine domains
Reduce duplicated code to handle virtual machine domains, there's no functionality changes. It also improves code readability. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Jiang Liu
Joerg Roedel
parent
e85bb5d4d1
commit
92d03cc8d0
@ -425,9 +425,12 @@ static LIST_HEAD(unmaps_to_do);
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static int timer_on;
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static long list_size;
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static void domain_exit(struct dmar_domain *domain);
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static void domain_remove_dev_info(struct dmar_domain *domain);
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static void domain_remove_one_dev_info(struct dmar_domain *domain,
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struct pci_dev *pdev);
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static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
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struct pci_dev *pdev);
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#ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
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int dmar_disabled = 0;
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@ -1286,10 +1289,6 @@ static int iommu_init_domains(struct intel_iommu *iommu)
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return 0;
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}
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static void domain_exit(struct dmar_domain *domain);
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static void vm_domain_exit(struct dmar_domain *domain);
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static void free_dmar_iommu(struct intel_iommu *iommu)
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{
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struct dmar_domain *domain;
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@ -1304,12 +1303,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
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spin_lock_irqsave(&domain->iommu_lock, flags);
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count = --domain->iommu_count;
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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if (count == 0) {
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if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
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vm_domain_exit(domain);
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else
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domain_exit(domain);
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}
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if (count == 0)
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domain_exit(domain);
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}
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}
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@ -1327,8 +1322,10 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
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free_context_table(iommu);
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}
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static struct dmar_domain *alloc_domain(void)
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static struct dmar_domain *alloc_domain(bool vm)
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{
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/* domain id for virtual machine, it won't be set in context */
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static atomic_t vm_domid = ATOMIC_INIT(0);
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struct dmar_domain *domain;
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domain = alloc_domain_mem();
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@ -1336,8 +1333,15 @@ static struct dmar_domain *alloc_domain(void)
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return NULL;
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domain->nid = -1;
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domain->iommu_count = 0;
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memset(domain->iommu_bmp, 0, sizeof(domain->iommu_bmp));
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domain->flags = 0;
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spin_lock_init(&domain->iommu_lock);
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INIT_LIST_HEAD(&domain->devices);
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if (vm) {
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domain->id = atomic_inc_return(&vm_domid);
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domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
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}
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return domain;
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}
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@ -1374,22 +1378,16 @@ static void iommu_detach_domain(struct dmar_domain *domain,
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{
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unsigned long flags;
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int num, ndomains;
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int found = 0;
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spin_lock_irqsave(&iommu->lock, flags);
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ndomains = cap_ndoms(iommu->cap);
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for_each_set_bit(num, iommu->domain_ids, ndomains) {
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if (iommu->domains[num] == domain) {
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found = 1;
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clear_bit(num, iommu->domain_ids);
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iommu->domains[num] = NULL;
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break;
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}
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}
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if (found) {
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clear_bit(num, iommu->domain_ids);
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clear_bit(iommu->seq_id, domain->iommu_bmp);
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iommu->domains[num] = NULL;
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}
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spin_unlock_irqrestore(&iommu->lock, flags);
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}
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@ -1461,8 +1459,6 @@ static int domain_init(struct dmar_domain *domain, int guest_width)
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unsigned long sagaw;
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init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
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spin_lock_init(&domain->iommu_lock);
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domain_reserve_special_ranges(domain);
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/* calculate AGAW */
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@ -1481,7 +1477,6 @@ static int domain_init(struct dmar_domain *domain, int guest_width)
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return -ENODEV;
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}
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domain->agaw = agaw;
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INIT_LIST_HEAD(&domain->devices);
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if (ecap_coherent(iommu->ecap))
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domain->iommu_coherency = 1;
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@ -1518,7 +1513,9 @@ static void domain_exit(struct dmar_domain *domain)
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if (!intel_iommu_strict)
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flush_unmaps_timeout(0);
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/* remove associated devices */
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domain_remove_dev_info(domain);
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/* destroy iovas */
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put_iova_domain(&domain->iovad);
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@ -1528,8 +1525,10 @@ static void domain_exit(struct dmar_domain *domain)
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/* free page tables */
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dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
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/* clear attached or cached domains */
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for_each_active_iommu(iommu, drhd)
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if (test_bit(iommu->seq_id, domain->iommu_bmp))
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if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE ||
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test_bit(iommu->seq_id, domain->iommu_bmp))
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iommu_detach_domain(domain, iommu);
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free_domain_mem(domain);
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@ -1921,7 +1920,7 @@ static inline void unlink_domain_info(struct device_domain_info *info)
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static void domain_remove_dev_info(struct dmar_domain *domain)
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{
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struct device_domain_info *info;
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unsigned long flags;
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unsigned long flags, flags2;
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struct intel_iommu *iommu;
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spin_lock_irqsave(&device_domain_lock, flags);
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@ -1934,8 +1933,22 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
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iommu_disable_dev_iotlb(info);
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iommu = device_to_iommu(info->segment, info->bus, info->devfn);
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iommu_detach_dev(iommu, info->bus, info->devfn);
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free_devinfo_mem(info);
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if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) {
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iommu_detach_dependent_devices(iommu, info->dev);
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/* clear this iommu in iommu_bmp, update iommu count
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* and capabilities
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*/
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spin_lock_irqsave(&domain->iommu_lock, flags2);
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if (test_and_clear_bit(iommu->seq_id,
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domain->iommu_bmp)) {
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domain->iommu_count--;
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domain_update_iommu_cap(domain);
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}
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spin_unlock_irqrestore(&domain->iommu_lock, flags2);
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}
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free_devinfo_mem(info);
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spin_lock_irqsave(&device_domain_lock, flags);
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}
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spin_unlock_irqrestore(&device_domain_lock, flags);
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@ -2055,7 +2068,7 @@ static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
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iommu = drhd->iommu;
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/* Allocate and intialize new domain for the device */
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domain = alloc_domain();
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domain = alloc_domain(false);
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if (!domain)
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goto error;
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if (iommu_attach_domain(domain, iommu)) {
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@ -2220,10 +2233,12 @@ static int __init si_domain_init(int hw)
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struct intel_iommu *iommu;
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int nid, ret = 0;
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si_domain = alloc_domain();
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si_domain = alloc_domain(false);
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if (!si_domain)
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return -EFAULT;
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si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
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for_each_active_iommu(iommu, drhd) {
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ret = iommu_attach_domain(si_domain, iommu);
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if (ret) {
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@ -2237,7 +2252,6 @@ static int __init si_domain_init(int hw)
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return -EFAULT;
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}
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si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
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pr_debug("IOMMU: identity mapping domain is domain %d\n",
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si_domain->id);
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@ -3810,67 +3824,11 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
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}
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}
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static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
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{
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struct device_domain_info *info;
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struct intel_iommu *iommu;
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unsigned long flags1, flags2;
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spin_lock_irqsave(&device_domain_lock, flags1);
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while (!list_empty(&domain->devices)) {
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info = list_entry(domain->devices.next,
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struct device_domain_info, link);
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unlink_domain_info(info);
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spin_unlock_irqrestore(&device_domain_lock, flags1);
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iommu_disable_dev_iotlb(info);
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iommu = device_to_iommu(info->segment, info->bus, info->devfn);
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iommu_detach_dev(iommu, info->bus, info->devfn);
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iommu_detach_dependent_devices(iommu, info->dev);
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/* clear this iommu in iommu_bmp, update iommu count
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* and capabilities
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*/
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spin_lock_irqsave(&domain->iommu_lock, flags2);
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if (test_and_clear_bit(iommu->seq_id,
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domain->iommu_bmp)) {
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domain->iommu_count--;
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domain_update_iommu_cap(domain);
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}
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spin_unlock_irqrestore(&domain->iommu_lock, flags2);
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free_devinfo_mem(info);
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spin_lock_irqsave(&device_domain_lock, flags1);
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}
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spin_unlock_irqrestore(&device_domain_lock, flags1);
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}
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/* domain id for virtual machine, it won't be set in context */
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static atomic_t vm_domid = ATOMIC_INIT(0);
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static struct dmar_domain *iommu_alloc_vm_domain(void)
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{
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struct dmar_domain *domain;
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domain = alloc_domain_mem();
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if (!domain)
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return NULL;
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domain->id = atomic_inc_return(&vm_domid);
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domain->nid = -1;
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memset(domain->iommu_bmp, 0, sizeof(domain->iommu_bmp));
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domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
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return domain;
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}
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static int md_domain_init(struct dmar_domain *domain, int guest_width)
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{
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int adjust_width;
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init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
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spin_lock_init(&domain->iommu_lock);
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domain_reserve_special_ranges(domain);
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/* calculate AGAW */
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@ -3878,9 +3836,6 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
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adjust_width = guestwidth_to_adjustwidth(guest_width);
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domain->agaw = width_to_agaw(adjust_width);
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INIT_LIST_HEAD(&domain->devices);
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domain->iommu_count = 0;
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domain->iommu_coherency = 0;
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domain->iommu_snooping = 0;
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domain->iommu_superpage = 0;
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@ -3895,53 +3850,11 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
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return 0;
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}
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static void iommu_free_vm_domain(struct dmar_domain *domain)
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{
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unsigned long flags;
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struct dmar_drhd_unit *drhd;
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struct intel_iommu *iommu;
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unsigned long i;
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unsigned long ndomains;
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for_each_active_iommu(iommu, drhd) {
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ndomains = cap_ndoms(iommu->cap);
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for_each_set_bit(i, iommu->domain_ids, ndomains) {
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if (iommu->domains[i] == domain) {
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spin_lock_irqsave(&iommu->lock, flags);
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clear_bit(i, iommu->domain_ids);
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iommu->domains[i] = NULL;
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spin_unlock_irqrestore(&iommu->lock, flags);
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break;
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}
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}
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}
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}
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static void vm_domain_exit(struct dmar_domain *domain)
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{
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/* Domain 0 is reserved, so dont process it */
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if (!domain)
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return;
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vm_domain_remove_all_dev_info(domain);
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/* destroy iovas */
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put_iova_domain(&domain->iovad);
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/* clear ptes */
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dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
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/* free page tables */
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dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
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iommu_free_vm_domain(domain);
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free_domain_mem(domain);
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}
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static int intel_iommu_domain_init(struct iommu_domain *domain)
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{
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struct dmar_domain *dmar_domain;
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dmar_domain = iommu_alloc_vm_domain();
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dmar_domain = alloc_domain(true);
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if (!dmar_domain) {
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printk(KERN_ERR
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"intel_iommu_domain_init: dmar_domain == NULL\n");
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@ -3950,7 +3863,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
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if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
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printk(KERN_ERR
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"intel_iommu_domain_init() failed\n");
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vm_domain_exit(dmar_domain);
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domain_exit(dmar_domain);
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return -ENOMEM;
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}
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domain_update_iommu_cap(dmar_domain);
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@ -3968,7 +3881,7 @@ static void intel_iommu_domain_destroy(struct iommu_domain *domain)
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struct dmar_domain *dmar_domain = domain->priv;
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domain->priv = NULL;
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vm_domain_exit(dmar_domain);
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domain_exit(dmar_domain);
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}
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static int intel_iommu_attach_device(struct iommu_domain *domain,
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