// SPDX-License-Identifier: GPL-2.0/* Copyright (C) 2018-2025, Advanced Micro Devices, Inc. */ #include <linux/dma-mapping.h> #include "ionic_queue.h" int ionic_queue_init(struct ionic_queue *q, struct device *dma_dev,		     int depth, size_t stride){	if (depth < 0 || depth > 0xffff)		return -EINVAL; 	if (stride == 0 || stride > 0x10000)		return -EINVAL; 	if (depth == 0)		depth = 1; 	q->depth_log2 = order_base_2(depth + 1);	q->stride_log2 = order_base_2(stride); 	if (q->depth_log2 + q->stride_log2 < PAGE_SHIFT)		q->depth_log2 = PAGE_SHIFT - q->stride_log2; 	if (q->depth_log2 > 16 || q->stride_log2 > 16)		return -EINVAL; 	q->size = BIT_ULL(q->depth_log2 + q->stride_log2);	q->mask = BIT(q->depth_log2) - 1; 	q->ptr = dma_alloc_coherent(dma_dev, q->size, &q->dma, GFP_KERNEL);	if (!q->ptr)		return -ENOMEM; 	/* it will always be page aligned, but just to be sure... */	if (!PAGE_ALIGNED(q->ptr)) {		dma_free_coherent(dma_dev, q->size, q->ptr, q->dma);		return -ENOMEM;	} 	q->prod = 0;	q->cons = 0;	q->dbell = 0; 	return 0;} void ionic_queue_destroy(struct ionic_queue *q, struct device *dma_dev){	dma_free_coherent(dma_dev, q->size, q->ptr, q->dma);}