linux-kernel - [PATCH 07/10] iommu/amd: factor out setting the remap table for a devid

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Date:   Fri, 23 Feb 2018 23:27:33 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        tglx@...utronix.de,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 07/10] iommu/amd: factor out setting the remap table for a devid

Setting the IRQ remap table for a specific devid (or its alias devid)
includes three steps. Those three steps are always repeated each time
this is done.
Introduce a new helper function, move those steps there and use that
function instead. The compiler can still decide if it is worth to
inline.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/iommu/amd_iommu.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index d3a05d794218..b763fcbd790d 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3588,6 +3588,14 @@ static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
 	amd_iommu_dev_table[devid].data[2] = dte;
 }
 
+static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid,
+				  struct irq_remap_table *table)
+{
+	irq_lookup_table[devid] = table;
+	set_dte_irq_entry(devid, table);
+	iommu_flush_dte(iommu, devid);
+}
+
 static struct irq_remap_table *get_irq_table(u16 devid)
 {
 	struct irq_remap_table *table = NULL;
@@ -3608,9 +3616,7 @@ static struct irq_remap_table *get_irq_table(u16 devid)
 	alias = amd_iommu_alias_table[devid];
 	table = irq_lookup_table[alias];
 	if (table) {
-		irq_lookup_table[devid] = table;
-		set_dte_irq_entry(devid, table);
-		iommu_flush_dte(iommu, devid);
+		set_remap_table_entry(iommu, devid, table);
 		goto out;
 	}
 
@@ -3637,14 +3643,9 @@ static struct irq_remap_table *get_irq_table(u16 devid)
 		       (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
 
 
-	irq_lookup_table[devid] = table;
-	set_dte_irq_entry(devid, table);
-	iommu_flush_dte(iommu, devid);
-	if (devid != alias) {
-		irq_lookup_table[alias] = table;
-		set_dte_irq_entry(alias, table);
-		iommu_flush_dte(iommu, alias);
-	}
+	set_remap_table_entry(iommu, devid, table);
+	if (devid != alias)
+		set_remap_table_entry(iommu, alias, table);
 
 out:
 	iommu_completion_wait(iommu);
-- 
2.16.1