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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) Huawei Technologies Co., Ltd. 2025. All rights reserved. */
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#ifndef _HINIC3_QUEUE_COMMON_H_
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#define _HINIC3_QUEUE_COMMON_H_
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#include <linux/types.h>
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#include "hinic3_common.h"
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struct hinic3_hwdev;
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struct hinic3_queue_pages {
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/* Array of DMA-able pages that actually holds the queue entries. */
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struct hinic3_dma_addr_align *pages;
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/* Page size in bytes. */
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u32 page_size;
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/* Number of pages, must be power of 2. */
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u16 num_pages;
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u8 elem_size_shift;
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u8 elem_per_pg_shift;
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};
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void hinic3_queue_pages_init(struct hinic3_queue_pages *qpages, u32 q_depth,
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u32 page_size, u32 elem_size);
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int hinic3_queue_pages_alloc(struct hinic3_hwdev *hwdev,
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struct hinic3_queue_pages *qpages, u32 align);
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void hinic3_queue_pages_free(struct hinic3_hwdev *hwdev,
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struct hinic3_queue_pages *qpages);
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/* Get pointer to queue entry at the specified index. Index does not have to be
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* masked to queue depth, only least significant bits will be used. Also
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* provides remaining elements in same page (including the first one) in case
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* caller needs multiple entries.
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*/
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static inline void *get_q_element(const struct hinic3_queue_pages *qpages,
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u32 idx, u32 *remaining_in_page)
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{
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const struct hinic3_dma_addr_align *page;
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u32 page_idx, elem_idx, elem_per_pg, ofs;
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u8 shift;
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shift = qpages->elem_per_pg_shift;
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page_idx = (idx >> shift) & (qpages->num_pages - 1);
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elem_per_pg = 1 << shift;
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elem_idx = idx & (elem_per_pg - 1);
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if (remaining_in_page)
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*remaining_in_page = elem_per_pg - elem_idx;
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ofs = elem_idx << qpages->elem_size_shift;
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page = qpages->pages + page_idx;
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return (char *)page->align_vaddr + ofs;
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}
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#endif
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