v4.19.13 snapshot.
diff --git a/drivers/dma/ioat/sysfs.c b/drivers/dma/ioat/sysfs.c
new file mode 100644
index 0000000..3ac677f
--- /dev/null
+++ b/drivers/dma/ioat/sysfs.c
@@ -0,0 +1,177 @@
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/pci.h>
+#include "dma.h"
+#include "registers.h"
+#include "hw.h"
+
+#include "../dmaengine.h"
+
+static ssize_t cap_show(struct dma_chan *c, char *page)
+{
+ struct dma_device *dma = c->device;
+
+ return sprintf(page, "copy%s%s%s%s%s\n",
+ dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
+ dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
+ dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
+ dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
+ dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
+
+}
+struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
+
+static ssize_t version_show(struct dma_chan *c, char *page)
+{
+ struct dma_device *dma = c->device;
+ struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
+
+ return sprintf(page, "%d.%d\n",
+ ioat_dma->version >> 4, ioat_dma->version & 0xf);
+}
+struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
+
+static ssize_t
+ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
+{
+ 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->show)
+ return -EIO;
+ 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)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct dma_chan *c;
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+ struct kobject *parent = &c->dev->device.kobj;
+ int err;
+
+ err = kobject_init_and_add(&ioat_chan->kobj, type,
+ parent, "quickdata");
+ if (err) {
+ dev_warn(to_dev(ioat_chan),
+ "sysfs init error (%d), continuing...\n", err);
+ kobject_put(&ioat_chan->kobj);
+ set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
+ }
+ }
+}
+
+void ioat_kobject_del(struct ioatdma_device *ioat_dma)
+{
+ struct dma_device *dma = &ioat_dma->dma_dev;
+ struct dma_chan *c;
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
+ kobject_del(&ioat_chan->kobj);
+ kobject_put(&ioat_chan->kobj);
+ }
+ }
+}
+
+static ssize_t ring_size_show(struct dma_chan *c, char *page)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
+}
+static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
+
+static ssize_t ring_active_show(struct dma_chan *c, char *page)
+{
+ struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
+
+ /* ...taken outside the lock, no need to be precise */
+ return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
+}
+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,
+};
+
+struct kobj_type ioat_ktype = {
+ .sysfs_ops = &ioat_sysfs_ops,
+ .default_attrs = ioat_attrs,
+};