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Subject[PATCH v2 1/2] iommu/iova: introduce iova_magazine_compact_pfns()
Date
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 --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)
--
1.8.3

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