diff mbox series

[v2,1/2] iommu/iova: introduce iova_magazine_compact_pfns()

Message ID 20190815121104.29140-2-thunder.leizhen@huawei.com (mailing list archive)
State New, archived
Headers show
Series iommu/iova: enhance the rcache optimization | expand

Commit Message

Leizhen (ThunderTown) Aug. 15, 2019, 12:11 p.m. UTC 
iova_magazine_free_pfns() can only free the whole magazine buffer, add
iova_magazine_compact_pfns() to support free part of it.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 drivers/iommu/iova.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index 3e1a8a6755723a9..4b7a9efa0ef40af 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -795,18 +795,19 @@  static void iova_magazine_free(struct iova_magazine *mag)
 	kfree(mag);
 }
 
-static void
-iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
+static void iova_magazine_compact_pfns(struct iova_magazine *mag,
+				       struct iova_domain *iovad,
+				       unsigned long newsize)
 {
 	unsigned long flags;
 	int i;
 
-	if (!mag)
+	if (!mag || mag->size <= newsize)
 		return;
 
 	spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
 
-	for (i = 0 ; i < mag->size; ++i) {
+	for (i = newsize; i < mag->size; ++i) {
 		struct iova *iova = private_find_iova(iovad, mag->pfns[i]);
 
 		BUG_ON(!iova);
@@ -815,7 +816,13 @@  static void iova_magazine_free(struct iova_magazine *mag)
 
 	spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
 
-	mag->size = 0;
+	mag->size = newsize;
+}
+
+static void
+iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
+{
+	iova_magazine_compact_pfns(mag, iovad, 0);
 }
 
 static bool iova_magazine_full(struct iova_magazine *mag)