#define VIRTIO_BLK_INLINE_SG_CNT 2
#endif
+static int virtblk_queue_count_set(const char *val,
+ const struct kernel_param *kp)
+{
+ return param_set_uint_minmax(val, kp, 1, nr_cpu_ids);
+}
+
+static const struct kernel_param_ops queue_count_ops = {
+ .set = virtblk_queue_count_set,
+ .get = param_get_uint,
+};
+
+static unsigned int num_request_queues;
+module_param_cb(num_request_queues, &queue_count_ops, &num_request_queues,
+ 0644);
+MODULE_PARM_DESC(num_request_queues,
+ "Limit the number of request queues to use for blk device. "
+ "0 for no limit. "
+ "Values > nr_cpu_ids truncated to nr_cpu_ids.");
+
static int major;
static DEFINE_IDA(vd_index_ida);
if (err)
num_vqs = 1;
- num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs);
+ num_vqs = min_t(unsigned int,
+ min_not_zero(num_request_queues, nr_cpu_ids),
+ num_vqs);
vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
if (!vblk->vqs)