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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Intel Corporation
#include <linux/device.h>
#include "ipu3.h"
#include "ipu3-css-pool.h"
#include "ipu3-dmamap.h"
int ipu3_css_dma_buffer_resize(struct imgu_device *imgu,
struct ipu3_css_map *map, size_t size)
{
if (map->size < size && map->vaddr) {
dev_warn(&imgu->pci_dev->dev, "dma buf resized from %zu to %zu",
map->size, size);
ipu3_dmamap_free(imgu, map);
if (!ipu3_dmamap_alloc(imgu, map, size))
return -ENOMEM;
}
return 0;
}
void ipu3_css_pool_cleanup(struct imgu_device *imgu, struct ipu3_css_pool *pool)
{
unsigned int i;
for (i = 0; i < IPU3_CSS_POOL_SIZE; i++)
ipu3_dmamap_free(imgu, &pool->entry[i].param);
}
int ipu3_css_pool_init(struct imgu_device *imgu, struct ipu3_css_pool *pool,
size_t size)
{
unsigned int i;
for (i = 0; i < IPU3_CSS_POOL_SIZE; i++) {
pool->entry[i].valid = false;
if (size == 0) {
pool->entry[i].param.vaddr = NULL;
continue;
}
if (!ipu3_dmamap_alloc(imgu, &pool->entry[i].param, size))
goto fail;
}
pool->last = IPU3_CSS_POOL_SIZE;
return 0;
fail:
ipu3_css_pool_cleanup(imgu, pool);
return -ENOMEM;
}
/*
* Allocate a new parameter via recycling the oldest entry in the pool.
*/
void ipu3_css_pool_get(struct ipu3_css_pool *pool)
{
/* Get the oldest entry */
u32 n = (pool->last + 1) % IPU3_CSS_POOL_SIZE;
pool->entry[n].valid = true;
pool->last = n;
}
/*
* Undo, for all practical purposes, the effect of pool_get().
*/
void ipu3_css_pool_put(struct ipu3_css_pool *pool)
{
pool->entry[pool->last].valid = false;
pool->last = (pool->last + IPU3_CSS_POOL_SIZE - 1) % IPU3_CSS_POOL_SIZE;
}
/**
* ipu3_css_pool_last - Retrieve the nth pool entry from last
*
* @pool: a pointer to &struct ipu3_css_pool.
* @n: the distance to the last index.
*
* Returns:
* The nth entry from last or null map to indicate no frame stored.
*/
const struct ipu3_css_map *
ipu3_css_pool_last(struct ipu3_css_pool *pool, unsigned int n)
{
static const struct ipu3_css_map null_map = { 0 };
int i = (pool->last + IPU3_CSS_POOL_SIZE - n) % IPU3_CSS_POOL_SIZE;
WARN_ON(n >= IPU3_CSS_POOL_SIZE);
if (!pool->entry[i].valid)
return &null_map;
return &pool->entry[i].param;
}
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