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Commit 17a21f58 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

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



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

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent d6c7f865

virt/kvm/arm/vgic/vgic-its.c

+54 −38
Original line number Diff line number Diff line
@@ -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 {

		collection = find_collection(its, coll_id);



		if (!collection) {

			collection = kzalloc(sizeof(struct its_collection),

					     GFP_KERNEL);

			if (!collection)

				return -ENOMEM;

			int ret;



			vgic_its_init_collection(its, collection, coll_id);

			ret = vgic_its_alloc_collection(its, &collection,

							coll_id);

			if (ret)

				return ret;

			collection->target_addr = target_addr;

		} else {

			collection->target_addr = target_addr;