linux-kernel - [PATCH v4 5/7] powerpc/iommu: Move iommu_table cleaning routine to iommu_table

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Date:   Thu, 16 Jul 2020 04:16:57 -0300
From:   Leonardo Bras <leobras.c@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Joel Stanley <joel@....id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Leonardo Bras <leobras.c@...il.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>,
        Brian King <brking@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/7] powerpc/iommu: Move iommu_table cleaning routine to iommu_table_clean

Move the part of iommu_table_free() that does struct iommu_table cleaning
into iommu_table_clean, so we can invoke it separately.

This new function is useful for cleaning struct iommu_table before
initializing it again with a new DMA window, without having it freed and
allocated again.

Signed-off-by: Leonardo Bras <leobras.c@...il.com>
---
 arch/powerpc/kernel/iommu.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 9704f3f76e63..c3242253a4e7 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -735,21 +735,10 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid,
 	return tbl;
 }
 
-static void iommu_table_free(struct kref *kref)
+static void iommu_table_clean(struct iommu_table *tbl)
 {
 	unsigned long bitmap_sz;
 	unsigned int order;
-	struct iommu_table *tbl;
-
-	tbl = container_of(kref, struct iommu_table, it_kref);
-
-	if (tbl->it_ops->free)
-		tbl->it_ops->free(tbl);
-
-	if (!tbl->it_map) {
-		kfree(tbl);
-		return;
-	}
 
 	iommu_table_release_pages(tbl);
 
@@ -763,6 +752,23 @@ static void iommu_table_free(struct kref *kref)
 	/* free bitmap */
 	order = get_order(bitmap_sz);
 	free_pages((unsigned long) tbl->it_map, order);
+}
+
+static void iommu_table_free(struct kref *kref)
+{
+	struct iommu_table *tbl;
+
+	tbl = container_of(kref, struct iommu_table, it_kref);
+
+	if (tbl->it_ops->free)
+		tbl->it_ops->free(tbl);
+
+	if (!tbl->it_map) {
+		kfree(tbl);
+		return;
+	}
+
+	iommu_table_clean(tbl);
 
 	/* free table */
 	kfree(tbl);
-- 
2.25.4