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KVM: arm64: vgic-its: Add collection allocator/destructor

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Instead of spreading random allocations all over the place,
consolidate allocation/init/freeing of collections in a pair
of constructor/destructor.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-07-17 20:01:46 +01:00
parent d6c7f865f0
commit 17a21f58ff
1 changed files with 55 additions and 39 deletions
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94
virt/kvm/arm/vgic/vgic-its.c
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@ -581,14 +581,45 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
return 0;
}
static void vgic_its_init_collection(struct vgic_its *its,
struct its_collection *collection,
static int vgic_its_alloc_collection(struct vgic_its *its,
struct its_collection **colp,
u32 coll_id)
{
struct its_collection *collection;
collection = kzalloc(sizeof(*collection), GFP_KERNEL);
collection->collection_id = coll_id;
collection->target_addr = COLLECTION_NOT_MAPPED;
list_add_tail(&collection->coll_list, &its->collection_list);
*colp = collection;
return 0;
}
static void vgic_its_free_collection(struct vgic_its *its, u32 coll_id)
{
struct its_collection *collection;
struct its_device *device;
struct its_itte *itte;
/*
* Clearing the mapping for that collection ID removes the
* entry from the list. If there wasn't any before, we can
* go home early.
*/
collection = find_collection(its, coll_id);
if (!collection)
return;
for_each_lpi_its(device, itte, its)
if (itte->collection &&
itte->collection->collection_id == coll_id)
itte->collection = NULL;
list_del(&collection->coll_list);
kfree(collection);
}
/*
@ -605,6 +636,7 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
struct its_device *device;
struct its_collection *collection, *new_coll = NULL;
int lpi_nr;
int ret;
device = find_its_device(its, device_id);
if (!device)
@ -612,9 +644,10 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
collection = find_collection(its, coll_id);
if (!collection) {
new_coll = kzalloc(sizeof(struct its_collection), GFP_KERNEL);
if (!new_coll)
return -ENOMEM;
ret = vgic_its_alloc_collection(its, &collection, coll_id);
if (ret)
return ret;
new_coll = collection;
}
if (subcmd == GITS_CMD_MAPTI)
@ -623,27 +656,22 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
lpi_nr = event_id;
if (lpi_nr < GIC_LPI_OFFSET ||
lpi_nr >= max_lpis_propbaser(kvm->arch.vgic.propbaser)) {
kfree(new_coll);
return E_ITS_MAPTI_PHYSICALID_OOR;
ret = E_ITS_MAPTI_PHYSICALID_OOR;
goto err;
}
itte = find_itte(its, device_id, event_id);
if (!itte) {
itte = kzalloc(sizeof(struct its_itte), GFP_KERNEL);
if (!itte) {
kfree(new_coll);
return -ENOMEM;
ret = -ENOMEM;
goto err;
}
itte->event_id = event_id;
list_add_tail(&itte->itte_list, &device->itt_head);
}
if (!collection) {
collection = new_coll;
vgic_its_init_collection(its, collection, coll_id);
}
itte->collection = collection;
itte->lpi = lpi_nr;
itte->irq = vgic_add_lpi(kvm, lpi_nr);
@ -657,6 +685,10 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
update_lpi_config(kvm, itte->irq, NULL);
return 0;
err:
if (new_coll)
vgic_its_free_collection(its, coll_id);
return ret;
}
/* Requires the its_lock to be held. */
@ -809,34 +841,18 @@ static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its,
if (coll_id >= vgic_its_nr_collection_ids(its))
return E_ITS_MAPC_COLLECTION_OOR;
collection = find_collection(its, coll_id);
if (!valid) {
struct its_device *device;
struct its_itte *itte;
/*
* Clearing the mapping for that collection ID removes the
* entry from the list. If there wasn't any before, we can
* go home early.
*/
if (!collection)
return 0;
for_each_lpi_its(device, itte, its)
if (itte->collection &&
itte->collection->collection_id == coll_id)
itte->collection = NULL;
list_del(&collection->coll_list);
kfree(collection);
vgic_its_free_collection(its, coll_id);
} else {
if (!collection) {
collection = kzalloc(sizeof(struct its_collection),
GFP_KERNEL);
if (!collection)
return -ENOMEM;
collection = find_collection(its, coll_id);
vgic_its_init_collection(its, collection, coll_id);
if (!collection) {
int ret;
ret = vgic_its_alloc_collection(its, &collection,
coll_id);
if (ret)
return ret;
collection->target_addr = target_addr;
} else {
collection->target_addr = target_addr;