[RFC PATCH 16/18] iommu/ioasid: Consult IOASIDs cgroup for allocation
From: Jacob Pan <hidden>
Date: 2021-02-28 06:43:43
Also in:
linux-iommu, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
Once IOASIDs cgroup is active, we must consult the limitation set up by the cgroups during allocation. Freeing IOASIDs also need to return the quota back to the cgroup. Signed-off-by: Jacob Pan <jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> --- drivers/iommu/ioasid.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c
index d42b39ca2c8b..fd3f5729c71d 100644
--- a/drivers/iommu/ioasid.c
+++ b/drivers/iommu/ioasid.c@@ -782,7 +782,10 @@ ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max, spin_lock(&ioasid_allocator_lock); /* Check if the IOASID set has been allocated and initialized */ - if (!ioasid_set_is_valid(set)) + if (!set || !ioasid_set_is_valid(set)) + goto done_unlock; + + if (set->type == IOASID_SET_TYPE_MM && ioasid_cg_charge(set)) goto done_unlock; if (set->quota <= atomic_read(&set->nr_ioasids)) {
@@ -832,6 +835,7 @@ ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max, goto done_unlock; exit_free: kfree(data); + ioasid_cg_uncharge(set); done_unlock: spin_unlock(&ioasid_allocator_lock); return id;
@@ -849,6 +853,7 @@ static void ioasid_do_free_locked(struct ioasid_data *data) kfree_rcu(ioasid_data, rcu); } atomic_dec(&data->set->nr_ioasids); + ioasid_cg_uncharge(data->set); xa_erase(&data->set->xa, data->id); /* Destroy the set if empty */ if (!atomic_read(&data->set->nr_ioasids))
--
2.25.1