diff mbox series

[v2,09/11] iommu/iova: Consolidate flush queue code

Message ID ea0142c046f89c2f917554988b243b130bd23bd2.1639157090.git.robin.murphy@arm.com (mailing list archive)
State New
Headers show
Series iommu: refactor flush queues into iommu-dma | expand

Commit Message

Robin Murphy Dec. 10, 2021, 5:54 p.m. UTC 
Squash and simplify some of the freeing code, and move the init
and free routines down into the rest of the flush queue code to
obviate the forward declarations.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---

v2: Rebase with del_timer_sync() change

 drivers/iommu/iova.c | 131 +++++++++++++++++++------------------------
 1 file changed, 58 insertions(+), 73 deletions(-)

Comments

John Garry Dec. 14, 2021, 4:39 p.m. UTC | #1 
On 10/12/2021 17:54, Robin Murphy wrote:
> Squash and simplify some of the freeing code, and move the init
> and free routines down into the rest of the flush queue code to

> obviate the forward declarations.
> 

It would be good to get rid of all of these eventually...

> Signed-off-by: Robin Murphy<robin.murphy@arm.com>
> ---

FWIW:

Reviewed-by: John Garry <john.garry@huawei.com>
diff mbox series

Patch

diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index a0250cebcdcf..c19f9a749070 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -24,8 +24,6 @@  static unsigned long iova_rcache_get(struct iova_domain *iovad,
 static void init_iova_rcaches(struct iova_domain *iovad);
 static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
 static void free_iova_rcaches(struct iova_domain *iovad);
-static void fq_destroy_all_entries(struct iova_domain *iovad);
-static void fq_flush_timeout(struct timer_list *t);
 
 static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node)
 {
@@ -73,60 +71,6 @@  init_iova_domain(struct iova_domain *iovad, unsigned long granule,
 }
 EXPORT_SYMBOL_GPL(init_iova_domain);
 
-static bool has_iova_flush_queue(struct iova_domain *iovad)
-{
-	return !!iovad->fq;
-}
-
-static void free_iova_flush_queue(struct iova_domain *iovad)
-{
-	if (!has_iova_flush_queue(iovad))
-		return;
-
-	del_timer_sync(&iovad->fq_timer);
-
-	fq_destroy_all_entries(iovad);
-
-	free_percpu(iovad->fq);
-
-	iovad->fq         = NULL;
-	iovad->fq_domain  = NULL;
-}
-
-int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_domain)
-{
-	struct iova_fq __percpu *queue;
-	int i, cpu;
-
-	atomic64_set(&iovad->fq_flush_start_cnt,  0);
-	atomic64_set(&iovad->fq_flush_finish_cnt, 0);
-
-	queue = alloc_percpu(struct iova_fq);
-	if (!queue)
-		return -ENOMEM;
-
-	for_each_possible_cpu(cpu) {
-		struct iova_fq *fq;
-
-		fq = per_cpu_ptr(queue, cpu);
-		fq->head = 0;
-		fq->tail = 0;
-
-		spin_lock_init(&fq->lock);
-
-		for (i = 0; i < IOVA_FQ_SIZE; i++)
-			INIT_LIST_HEAD(&fq->entries[i].freelist);
-	}
-
-	iovad->fq_domain = fq_domain;
-	iovad->fq = queue;
-
-	timer_setup(&iovad->fq_timer, fq_flush_timeout, 0);
-	atomic_set(&iovad->fq_timer_on, 0);
-
-	return 0;
-}
-
 static struct rb_node *
 __get_cached_rbnode(struct iova_domain *iovad, unsigned long limit_pfn)
 {
@@ -585,23 +529,6 @@  static void iova_domain_flush(struct iova_domain *iovad)
 	atomic64_inc(&iovad->fq_flush_finish_cnt);
 }
 
-static void fq_destroy_all_entries(struct iova_domain *iovad)
-{
-	int cpu;
-
-	/*
-	 * This code runs when the iova_domain is being detroyed, so don't
-	 * bother to free iovas, just free any remaining pagetable pages.
-	 */
-	for_each_possible_cpu(cpu) {
-		struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu);
-		int idx;
-
-		fq_ring_for_each(idx, fq)
-			put_pages_list(&fq->entries[idx].freelist);
-	}
-}
-
 static void fq_flush_timeout(struct timer_list *t)
 {
 	struct iova_domain *iovad = from_timer(iovad, t, fq_timer);
@@ -669,6 +596,64 @@  void queue_iova(struct iova_domain *iovad,
 			  jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT));
 }
 
+static void free_iova_flush_queue(struct iova_domain *iovad)
+{
+	int cpu, idx;
+
+	if (!iovad->fq)
+		return;
+
+	del_timer_sync(&iovad->fq_timer);
+	/*
+	 * This code runs when the iova_domain is being detroyed, so don't
+	 * bother to free iovas, just free any remaining pagetable pages.
+	 */
+	for_each_possible_cpu(cpu) {
+		struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu);
+
+		fq_ring_for_each(idx, fq)
+			put_pages_list(&fq->entries[idx].freelist);
+	}
+
+	free_percpu(iovad->fq);
+
+	iovad->fq = NULL;
+	iovad->fq_domain = NULL;
+}
+
+int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_domain)
+{
+	struct iova_fq __percpu *queue;
+	int i, cpu;
+
+	atomic64_set(&iovad->fq_flush_start_cnt,  0);
+	atomic64_set(&iovad->fq_flush_finish_cnt, 0);
+
+	queue = alloc_percpu(struct iova_fq);
+	if (!queue)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu) {
+		struct iova_fq *fq = per_cpu_ptr(queue, cpu);
+
+		fq->head = 0;
+		fq->tail = 0;
+
+		spin_lock_init(&fq->lock);
+
+		for (i = 0; i < IOVA_FQ_SIZE; i++)
+			INIT_LIST_HEAD(&fq->entries[i].freelist);
+	}
+
+	iovad->fq_domain = fq_domain;
+	iovad->fq = queue;
+
+	timer_setup(&iovad->fq_timer, fq_flush_timeout, 0);
+	atomic_set(&iovad->fq_timer_on, 0);
+
+	return 0;
+}
+
 /**
  * put_iova_domain - destroys the iova domain
  * @iovad: - iova domain in question.