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iommu/vt-d: Implement is_attach_deferred iommu ops entry

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As a domain is now attached to a device earlier, we should
implement the is_attach_deferred call-back and use it to
defer the domain attach from iommu driver init to device
driver init when iommu is pre-enabled in kdump kernel.

Suggested-by: Tom Murphy <tmurphy@arista.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-05-25 13:41:32 +08:00 committed by Joerg Roedel
parent fa212a97f3
commit 8af46c784e
1 changed files with 23 additions and 0 deletions
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23
drivers/iommu/intel-iommu.c
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@ -353,6 +353,8 @@ static void domain_context_clear(struct intel_iommu *iommu,
static int domain_detach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu);
static bool device_is_rmrr_locked(struct device *dev);
static int intel_iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
#ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
int dmar_disabled = 0;
@ -378,6 +380,7 @@ int intel_iommu_gfx_mapped;
EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
#define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
#define DEFER_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-2))
static DEFINE_SPINLOCK(device_domain_lock);
static LIST_HEAD(device_domain_list);
@ -2408,8 +2411,18 @@ static struct dmar_domain *find_domain(struct device *dev)
{
struct device_domain_info *info;
if (unlikely(dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO)) {
struct iommu_domain *domain;
dev->archdata.iommu = NULL;
domain = iommu_get_domain_for_dev(dev);
if (domain)
intel_iommu_attach_device(domain, dev);
}
/* No lock here, assumes no domain exit in normal case */
info = dev->archdata.iommu;
if (likely(info))
return info->domain;
return NULL;
@ -5504,6 +5517,9 @@ static int intel_iommu_add_device(struct device *dev)
iommu_device_link(&iommu->iommu, dev);
if (translation_pre_enabled(iommu))
dev->archdata.iommu = DEFER_DEVICE_DOMAIN_INFO;
group = iommu_group_get_for_dev(dev);
if (IS_ERR(group))
@ -5828,6 +5844,12 @@ intel_iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
dmar_domain->default_pasid : -EINVAL;
}
static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
struct device *dev)
{
return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;
}
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
@ -5850,6 +5872,7 @@ const struct iommu_ops intel_iommu_ops = {
.dev_feat_enabled = intel_iommu_dev_feat_enabled,
.dev_enable_feat = intel_iommu_dev_enable_feat,
.dev_disable_feat = intel_iommu_dev_disable_feat,
.is_attach_deferred = intel_iommu_is_attach_deferred,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};