1 files changed, 30 insertions, 17 deletions

diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 523ae0dff7d4..6af493f6ba77 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -91,7 +91,7 @@ static void idxd_conf_engine_release(struct device *dev)
 	kfree(engine);
 }
 
-struct device_type idxd_engine_device_type = {
+const struct device_type idxd_engine_device_type = {
 	.name = "engine",
 	.release = idxd_conf_engine_release,
 	.groups = idxd_engine_attribute_groups,
@@ -577,7 +577,7 @@ static void idxd_conf_group_release(struct device *dev)
 	kfree(group);
 }
 
-struct device_type idxd_group_device_type = {
+const struct device_type idxd_group_device_type = {
 	.name = "group",
 	.release = idxd_conf_group_release,
 	.groups = idxd_group_attribute_groups,
@@ -1197,12 +1197,35 @@ static ssize_t wq_enqcmds_retries_store(struct device *dev, struct device_attrib
 static struct device_attribute dev_attr_wq_enqcmds_retries =
 		__ATTR(enqcmds_retries, 0644, wq_enqcmds_retries_show, wq_enqcmds_retries_store);
 
+static ssize_t op_cap_show_common(struct device *dev, char *buf, unsigned long *opcap_bmap)
+{
+	ssize_t pos;
+	int i;
+
+	pos = 0;
+	for (i = IDXD_MAX_OPCAP_BITS/64 - 1; i >= 0; i--) {
+		unsigned long val = opcap_bmap[i];
+
+		/* On systems where direct user submissions are not safe, we need to clear out
+		 * the BATCH capability from the capability mask in sysfs since we cannot support
+		 * that command on such systems.
+		 */
+		if (i == DSA_OPCODE_BATCH/64 && !confdev_to_idxd(dev)->user_submission_safe)
+			clear_bit(DSA_OPCODE_BATCH % 64, &val);
+
+		pos += sysfs_emit_at(buf, pos, "%*pb", 64, &val);
+		pos += sysfs_emit_at(buf, pos, "%c", i == 0 ? '\n' : ',');
+	}
+
+	return pos;
+}
+
 static ssize_t wq_op_config_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
 	struct idxd_wq *wq = confdev_to_wq(dev);
 
-	return sysfs_emit(buf, "%*pb\n", IDXD_MAX_OPCAP_BITS, wq->opcap_bmap);
+	return op_cap_show_common(dev, buf, wq->opcap_bmap);
 }
 
 static int idxd_verify_supported_opcap(struct idxd_device *idxd, unsigned long *opmask)
@@ -1369,7 +1392,7 @@ static void idxd_conf_wq_release(struct device *dev)
 	kfree(wq);
 }
 
-struct device_type idxd_wq_device_type = {
+const struct device_type idxd_wq_device_type = {
 	.name = "wq",
 	.release = idxd_conf_wq_release,
 	.groups = idxd_wq_attribute_groups,
@@ -1455,7 +1478,7 @@ static ssize_t op_cap_show(struct device *dev,
 {
 	struct idxd_device *idxd = confdev_to_idxd(dev);
 
-	return sysfs_emit(buf, "%*pb\n", IDXD_MAX_OPCAP_BITS, idxd->opcap_bmap);
+	return op_cap_show_common(dev, buf, idxd->opcap_bmap);
 }
 static DEVICE_ATTR_RO(op_cap);
 
@@ -1798,13 +1821,13 @@ static void idxd_conf_device_release(struct device *dev)
 	kfree(idxd);
 }
 
-struct device_type dsa_device_type = {
+const struct device_type dsa_device_type = {
 	.name = "dsa",
 	.release = idxd_conf_device_release,
 	.groups = idxd_attribute_groups,
 };
 
-struct device_type iax_device_type = {
+const struct device_type iax_device_type = {
 	.name = "iax",
 	.release = idxd_conf_device_release,
 	.groups = idxd_attribute_groups,
@@ -1956,13 +1979,3 @@ void idxd_unregister_devices(struct idxd_device *idxd)
 		device_unregister(group_confdev(group));
 	}
 }
-
-int idxd_register_bus_type(void)
-{
-	return bus_register(&dsa_bus_type);
-}
-
-void idxd_unregister_bus_type(void)
-{
-	bus_unregister(&dsa_bus_type);
-}