diff options
Diffstat (limited to 'drivers/iommu/arm-smmu.c')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 47 |
1 files changed, 25 insertions, 22 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index ca18d6d42a9..98fcd87cbac 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -868,10 +868,15 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain) static int arm_smmu_init_domain_context(struct iommu_domain *domain, struct arm_smmu_device *smmu) { - int irq, ret, start; + int irq, start, ret = 0; + unsigned long flags; struct arm_smmu_domain *smmu_domain = domain->priv; struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + spin_lock_irqsave(&smmu_domain->lock, flags); + if (smmu_domain->smmu) + goto out_unlock; + if (smmu->features & ARM_SMMU_FEAT_TRANS_NESTED) { /* * We will likely want to change this if/when KVM gets @@ -890,7 +895,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, ret = __arm_smmu_alloc_bitmap(smmu->context_map, start, smmu->num_context_banks); if (IS_ERR_VALUE(ret)) - return ret; + goto out_unlock; cfg->cbndx = ret; if (smmu->version == 1) { @@ -900,6 +905,10 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, cfg->irptndx = cfg->cbndx; } + ACCESS_ONCE(smmu_domain->smmu) = smmu; + arm_smmu_init_context_bank(smmu_domain); + spin_unlock_irqrestore(&smmu_domain->lock, flags); + irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx]; ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED, "arm-smmu-context-fault", domain); @@ -907,15 +916,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n", cfg->irptndx, irq); cfg->irptndx = INVALID_IRPTNDX; - goto out_free_context; } - smmu_domain->smmu = smmu; - arm_smmu_init_context_bank(smmu_domain); return 0; -out_free_context: - __arm_smmu_free_bitmap(smmu->context_map, cfg->cbndx); +out_unlock: + spin_unlock_irqrestore(&smmu_domain->lock, flags); return ret; } @@ -1172,11 +1178,10 @@ static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain, static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) { - int ret = -EINVAL; + int ret; struct arm_smmu_domain *smmu_domain = domain->priv; - struct arm_smmu_device *smmu; + struct arm_smmu_device *smmu, *dom_smmu; struct arm_smmu_master_cfg *cfg; - unsigned long flags; smmu = dev_get_master_dev(dev)->archdata.iommu; if (!smmu) { @@ -1188,20 +1193,22 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) * Sanity check the domain. We don't support domains across * different SMMUs. */ - spin_lock_irqsave(&smmu_domain->lock, flags); - if (!smmu_domain->smmu) { + dom_smmu = ACCESS_ONCE(smmu_domain->smmu); + if (!dom_smmu) { /* Now that we have a master, we can finalise the domain */ ret = arm_smmu_init_domain_context(domain, smmu); if (IS_ERR_VALUE(ret)) - goto err_unlock; - } else if (smmu_domain->smmu != smmu) { + return ret; + + dom_smmu = smmu_domain->smmu; + } + + if (dom_smmu != smmu) { dev_err(dev, "cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n", - dev_name(smmu_domain->smmu->dev), - dev_name(smmu->dev)); - goto err_unlock; + dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev)); + return -EINVAL; } - spin_unlock_irqrestore(&smmu_domain->lock, flags); /* Looks ok, so add the device to the domain */ cfg = find_smmu_master_cfg(smmu_domain->smmu, dev); @@ -1209,10 +1216,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) return -ENODEV; return arm_smmu_domain_add_master(smmu_domain, cfg); - -err_unlock: - spin_unlock_irqrestore(&smmu_domain->lock, flags); - return ret; } static void arm_smmu_detach_dev(struct iommu_domain *domain, struct device *dev) |