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iommu/vt-d: Use cache helpers in arch_invalidate_secondary_tlbs

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The arch_invalidate_secondary_tlbs callback is called in the SVA mm
notification path. It invalidates all or a range of caches after the
CPU page table is modified. Use the cache tag helps in this path.

The mm_types defines vm_end as the first byte after the end address
which is different from the iommu gather API, hence convert the end
parameter from mm_types to iommu gather scheme before calling the
cache_tag helper.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240416080656.60968-10-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2024-04-24 15:16:41 +08:00 • committed by Joerg Roedel
parent 8ebc22366e
commit 4f609dbff5
2 changed files with 11 additions and 71 deletions
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1
drivers/iommu/intel/iommu.h
View file

@ -1166,6 +1166,7 @@ struct intel_svm {
struct mm_struct *mm;
u32 pasid;
struct list_head devs;
struct dmar_domain *domain;
};
#else
static inline void intel_svm_check(struct intel_iommu *iommu) {}

81
drivers/iommu/intel/svm.c
View file

@ -168,88 +168,25 @@ void intel_svm_check(struct intel_iommu *iommu)
iommu->flags |= VTD_FLAG_SVM_CAPABLE;
}
static void __flush_svm_range_dev(struct intel_svm *svm,
struct intel_svm_dev *sdev,
unsigned long address,
unsigned long pages, int ih)
{
struct device_domain_info *info = dev_iommu_priv_get(sdev->dev);
if (WARN_ON(!pages))
return;
qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, address, pages, ih);
if (info->ats_enabled) {
qi_flush_dev_iotlb_pasid(sdev->iommu, sdev->sid, info->pfsid,
svm->pasid, sdev->qdep, address,
order_base_2(pages));
quirk_extra_dev_tlb_flush(info, address, order_base_2(pages),
svm->pasid, sdev->qdep);
}
}
static void intel_flush_svm_range_dev(struct intel_svm *svm,
struct intel_svm_dev *sdev,
unsigned long address,
unsigned long pages, int ih)
{
unsigned long shift = ilog2(__roundup_pow_of_two(pages));
unsigned long align = (1ULL << (VTD_PAGE_SHIFT + shift));
unsigned long start = ALIGN_DOWN(address, align);
unsigned long end = ALIGN(address + (pages << VTD_PAGE_SHIFT), align);
while (start < end) {
__flush_svm_range_dev(svm, sdev, start, align >> VTD_PAGE_SHIFT, ih);
start += align;
}
}
static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address,
unsigned long pages, int ih)
{
struct intel_svm_dev *sdev;
rcu_read_lock();
list_for_each_entry_rcu(sdev, &svm->devs, list)
intel_flush_svm_range_dev(svm, sdev, address, pages, ih);
rcu_read_unlock();
}
static void intel_flush_svm_all(struct intel_svm *svm)
{
struct device_domain_info *info;
struct intel_svm_dev *sdev;
rcu_read_lock();
list_for_each_entry_rcu(sdev, &svm->devs, list) {
info = dev_iommu_priv_get(sdev->dev);
qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, 0, -1UL, 0);
if (info->ats_enabled) {
qi_flush_dev_iotlb_pasid(sdev->iommu, sdev->sid, info->pfsid,
svm->pasid, sdev->qdep,
0, 64 - VTD_PAGE_SHIFT);
quirk_extra_dev_tlb_flush(info, 0, 64 - VTD_PAGE_SHIFT,
svm->pasid, sdev->qdep);
}
}
rcu_read_unlock();
}
/* Pages have been freed at this point */
static void intel_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start, unsigned long end)
{
struct intel_svm *svm = container_of(mn, struct intel_svm, notifier);
struct dmar_domain *domain = svm->domain;
if (start == 0 && end == -1UL) {
intel_flush_svm_all(svm);
cache_tag_flush_all(domain);
return;
}
intel_flush_svm_range(svm, start,
(end - start + PAGE_SIZE - 1) >> VTD_PAGE_SHIFT, 0);
/*
* The mm_types defines vm_end as the first byte after the end address,
* different from IOMMU subsystem using the last address of an address
* range.
*/
cache_tag_flush_range(domain, start, end - 1, 0);
}
static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
@ -336,6 +273,7 @@ static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
INIT_LIST_HEAD_RCU(&svm->devs);
svm->notifier.ops = &intel_mmuops;
svm->domain = to_dmar_domain(domain);
ret = mmu_notifier_register(&svm->notifier, mm);
if (ret) {
kfree(svm);
@ -747,6 +685,7 @@ struct iommu_domain *intel_svm_domain_alloc(void)
if (!domain)
return NULL;
domain->domain.ops = &intel_svm_domain_ops;
domain->use_first_level = true;
INIT_LIST_HEAD(&domain->cache_tags);
spin_lock_init(&domain->cache_lock);