1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/dma/ioat/sysfs.c b/drivers/dma/ioat/sysfs.c
index cb4a857ee21b..3ac677f29e8f 100644
--- a/drivers/dma/ioat/sysfs.c
+++ b/drivers/dma/ioat/sysfs.c
@@ -64,8 +64,24 @@ ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
         return entry->show(&ioat_chan->dma_chan, page);
 }
 
+static ssize_t
+ioat_attr_store(struct kobject *kobj, struct attribute *attr,
+const char *page, size_t count)
+{
+        struct ioat_sysfs_entry *entry;
+        struct ioatdma_chan *ioat_chan;
+
+        entry = container_of(attr, struct ioat_sysfs_entry, attr);
+        ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
+
+        if (!entry->store)
+                return -EIO;
+        return entry->store(&ioat_chan->dma_chan, page, count);
+}
+
 const struct sysfs_ops ioat_sysfs_ops = {
         .show   = ioat_attr_show,
+        .store  = ioat_attr_store,
 };
 
 void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
@@ -121,11 +137,37 @@ static ssize_t ring_active_show(struct dma_chan *c, char *page)
 }
 static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
 
+static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
+{
+        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+        return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
+}
+
+static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
+size_t count)
+{
+        int intr_coalesce = 0;
+        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+        if (sscanf(page, "%du", &intr_coalesce) != -1) {
+                if ((intr_coalesce < 0) ||
+                    (intr_coalesce > IOAT_INTRDELAY_MASK))
+                        return -EINVAL;
+                ioat_chan->intr_coalesce = intr_coalesce;
+        }
+
+        return count;
+}
+
+static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
+
 static struct attribute *ioat_attrs[] = {
         &ring_size_attr.attr,
         &ring_active_attr.attr,
         &ioat_cap_attr.attr,
         &ioat_version_attr.attr,
+        &intr_coalesce_attr.attr,
         NULL,
 };