// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Intel Corporation
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#include <linux/device.h>
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#include "ipu3.h"
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#include "ipu3-css-pool.h"
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#include "ipu3-dmamap.h"
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int imgu_css_dma_buffer_resize(struct imgu_device *imgu,
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struct imgu_css_map *map, size_t size)
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{
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if (map->size < size && map->vaddr) {
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dev_warn(&imgu->pci_dev->dev, "dma buf resized from %zu to %zu",
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map->size, size);
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imgu_dmamap_free(imgu, map);
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if (!imgu_dmamap_alloc(imgu, map, size))
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return -ENOMEM;
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}
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return 0;
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}
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void imgu_css_pool_cleanup(struct imgu_device *imgu, struct imgu_css_pool *pool)
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{
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unsigned int i;
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for (i = 0; i < IPU3_CSS_POOL_SIZE; i++)
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imgu_dmamap_free(imgu, &pool->entry[i].param);
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}
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int imgu_css_pool_init(struct imgu_device *imgu, struct imgu_css_pool *pool,
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size_t size)
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{
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unsigned int i;
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for (i = 0; i < IPU3_CSS_POOL_SIZE; i++) {
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pool->entry[i].valid = false;
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if (size == 0) {
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pool->entry[i].param.vaddr = NULL;
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continue;
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}
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if (!imgu_dmamap_alloc(imgu, &pool->entry[i].param, size))
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goto fail;
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}
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pool->last = IPU3_CSS_POOL_SIZE;
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return 0;
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fail:
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imgu_css_pool_cleanup(imgu, pool);
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return -ENOMEM;
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}
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/*
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* Allocate a new parameter via recycling the oldest entry in the pool.
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*/
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void imgu_css_pool_get(struct imgu_css_pool *pool)
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{
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/* Get the oldest entry */
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u32 n = (pool->last + 1) % IPU3_CSS_POOL_SIZE;
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pool->entry[n].valid = true;
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pool->last = n;
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}
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/*
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* Undo, for all practical purposes, the effect of pool_get().
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*/
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void imgu_css_pool_put(struct imgu_css_pool *pool)
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{
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pool->entry[pool->last].valid = false;
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pool->last = (pool->last + IPU3_CSS_POOL_SIZE - 1) % IPU3_CSS_POOL_SIZE;
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}
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/**
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* imgu_css_pool_last - Retrieve the nth pool entry from last
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*
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* @pool: a pointer to &struct imgu_css_pool.
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* @n: the distance to the last index.
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*
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* Returns:
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* The nth entry from last or null map to indicate no frame stored.
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*/
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const struct imgu_css_map *
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imgu_css_pool_last(struct imgu_css_pool *pool, unsigned int n)
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{
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static const struct imgu_css_map null_map = { 0 };
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int i = (pool->last + IPU3_CSS_POOL_SIZE - n) % IPU3_CSS_POOL_SIZE;
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WARN_ON(n >= IPU3_CSS_POOL_SIZE);
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if (!pool->entry[i].valid)
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return &null_map;
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return &pool->entry[i].param;
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}
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