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iommu/sva: remove iommu_sva_present flag

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The global iommu_sva_present bool merely mirrors
!list_empty(&iommu_sva_mms) under the same mutex. Remove it and rely
on list_for_each_entry to handle the empty list case, which is a no-op.

Signed-off-by: Zhaoyu Liu <liuzhaoyu.zackary@picoheart.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Zhaoyu Liu 2026-08-23 17:24:36 +08:00 committed by Joerg Roedel
parent 93f51579e7
commit 183629813e
1 changed files with 3 additions and 11 deletions
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14
drivers/iommu/iommu-sva.c
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@ -11,7 +11,6 @@
#include "iommu-priv.h"
static DEFINE_MUTEX(iommu_sva_lock);
static bool iommu_sva_present;
static LIST_HEAD(iommu_sva_mms);
static struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
struct mm_struct *mm);
@ -137,11 +136,9 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
goto out_free_domain;
domain->users = 1;
if (list_empty(&iommu_mm->sva_domains)) {
if (list_empty(&iommu_sva_mms))
iommu_sva_present = true;
if (list_empty(&iommu_mm->sva_domains))
list_add(&iommu_mm->mm_list_elm, &iommu_sva_mms);
}
list_add(&domain->next, &iommu_mm->sva_domains);
out:
refcount_set(&handle->users, 1);
@ -182,11 +179,8 @@ void iommu_sva_unbind_device(struct iommu_sva *handle)
iommu_detach_device_pasid(domain, dev, iommu_mm->pasid);
if (--domain->users == 0) {
list_del(&domain->next);
if (list_empty(&iommu_mm->sva_domains)) {
if (list_empty(&iommu_mm->sva_domains))
list_del(&iommu_mm->mm_list_elm);
if (list_empty(&iommu_sva_mms))
iommu_sva_present = false;
}
iommu_domain_free(domain);
}
@ -334,8 +328,6 @@ void iommu_sva_invalidate_kva_range(unsigned long start, unsigned long end)
struct iommu_mm_data *iommu_mm;
guard(mutex)(&iommu_sva_lock);
if (!iommu_sva_present)
return;
list_for_each_entry(iommu_mm, &iommu_sva_mms, mm_list_elm)
mmu_notifier_arch_invalidate_secondary_tlbs(iommu_mm->mm, start, end);