iommu/vt-d: Establish domain<->iommu link in dmar_insert_one_dev_info

This makes domain attachment more synchronous with domain
deattachment. The domain<->iommu link is released in
dmar_remove_one_dev_info.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index de5384e..46359bd 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1919,14 +1919,16 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
                                      struct intel_iommu *iommu,
                                      u8 bus, u8 devfn)
 {
+       u16 did = domain->iommu_did[iommu->seq_id];
        int translation = CONTEXT_TT_MULTI_LEVEL;
        struct device_domain_info *info = NULL;
        struct context_entry *context;
        unsigned long flags;
        struct dma_pte *pgd;
-       int id;
        int agaw;
 
+       WARN_ON(did == 0);
+
        if (hw_pass_through && domain_type_is_si(domain))
                translation = CONTEXT_TT_PASS_THROUGH;
 
@@ -1948,15 +1950,8 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
 
        pgd = domain->pgd;
 
-       id = __iommu_attach_domain(domain, iommu);
-       if (id < 0) {
-               spin_unlock_irqrestore(&iommu->lock, flags);
-               pr_err("%s: No free domain ids\n", iommu->name);
-               return -EFAULT;
-       }
-
        context_clear_entry(context);
-       context_set_domain_id(context, id);
+       context_set_domain_id(context, did);
 
        /*
         * Skip top levels of page tables for iommu which has less agaw
@@ -2002,15 +1997,13 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
                                           (((u16)bus) << 8) | devfn,
                                           DMA_CCMD_MASK_NOBIT,
                                           DMA_CCMD_DEVICE_INVL);
-               iommu->flush.flush_iotlb(iommu, id, 0, 0, DMA_TLB_DSI_FLUSH);
+               iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
        } else {
                iommu_flush_write_buffer(iommu);
        }
        iommu_enable_dev_iotlb(info);
        spin_unlock_irqrestore(&iommu->lock, flags);
 
-       domain_attach_iommu(domain, iommu);
-
        return 0;
 }
 
@@ -2320,6 +2313,12 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
                return found;
        }
 
+       if (iommu_attach_domain(domain, iommu) < 0) {
+               spin_unlock_irqrestore(&device_domain_lock, flags);
+               return NULL;
+       }
+       domain_attach_iommu(domain, iommu);
+
        list_add(&info->link, &domain->devices);
        list_add(&info->global, &device_domain_list);
        if (dev)
@@ -2383,11 +2382,6 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
        domain = alloc_domain(0);
        if (!domain)
                return NULL;
-       if (iommu_attach_domain(domain, iommu) < 0) {
-               free_domain_mem(domain);
-               return NULL;
-       }
-       domain_attach_iommu(domain, iommu);
        if (domain_init(domain, iommu, gaw)) {
                domain_exit(domain);
                return NULL;