From e9fad6f1d2307d42e6b8f40c78b51c1f59c61922 Mon Sep 17 00:00:00 2001 From: Yong Zhi Date: Thu, 6 Dec 2018 20:03:30 -0500 Subject: [PATCH] media: staging/intel-ipu3: css: Add dma buff pool utility functions The pools are used to store previous parameters set by user with the parameter queue. Due to pipelining, there needs to be multiple sets (up to four) of parameters which are queued in a host-to-sp queue. [mchehab@kernel.org: fixed two minor issues on comments: a space before tab and a typo: "vaid" -> "valid"] Signed-off-by: Yong Zhi Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/media/ipu3/ipu3-css-pool.c | 100 +++++++++++++++++++++ drivers/staging/media/ipu3/ipu3-css-pool.h | 55 ++++++++++++ 2 files changed, 155 insertions(+) create mode 100644 drivers/staging/media/ipu3/ipu3-css-pool.c create mode 100644 drivers/staging/media/ipu3/ipu3-css-pool.h diff --git a/drivers/staging/media/ipu3/ipu3-css-pool.c b/drivers/staging/media/ipu3/ipu3-css-pool.c new file mode 100644 index 000000000000..6f271f81669b --- /dev/null +++ b/drivers/staging/media/ipu3/ipu3-css-pool.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Intel Corporation + +#include + +#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; +} diff --git a/drivers/staging/media/ipu3/ipu3-css-pool.h b/drivers/staging/media/ipu3/ipu3-css-pool.h new file mode 100644 index 000000000000..2657c39a4d71 --- /dev/null +++ b/drivers/staging/media/ipu3/ipu3-css-pool.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2018 Intel Corporation */ + +#ifndef __IPU3_UTIL_H +#define __IPU3_UTIL_H + +struct device; +struct imgu_device; + +#define IPU3_CSS_POOL_SIZE 4 + +/** + * ipu3_css_map - store DMA mapping info for buffer + * + * @size: size of the buffer in bytes. + * @vaddr: kernel virtual address. + * @daddr: iova dma address to access IPU3. + * @vma: private, a pointer to &struct vm_struct, + * used for ipu3_dmamap_free. + */ +struct ipu3_css_map { + size_t size; + void *vaddr; + dma_addr_t daddr; + struct vm_struct *vma; +}; + +/** + * ipu3_css_pool - circular buffer pool definition + * + * @entry: array with IPU3_CSS_POOL_SIZE elements. + * @entry.param: a &struct ipu3_css_map for storing the mem mapping. + * @entry.valid: used to mark if the entry has valid data. + * @last: write pointer, initialized to IPU3_CSS_POOL_SIZE. + */ +struct ipu3_css_pool { + struct { + struct ipu3_css_map param; + bool valid; + } entry[IPU3_CSS_POOL_SIZE]; + u32 last; +}; + +int ipu3_css_dma_buffer_resize(struct imgu_device *imgu, + struct ipu3_css_map *map, size_t size); +void ipu3_css_pool_cleanup(struct imgu_device *imgu, + struct ipu3_css_pool *pool); +int ipu3_css_pool_init(struct imgu_device *imgu, struct ipu3_css_pool *pool, + size_t size); +void ipu3_css_pool_get(struct ipu3_css_pool *pool); +void ipu3_css_pool_put(struct ipu3_css_pool *pool); +const struct ipu3_css_map *ipu3_css_pool_last(struct ipu3_css_pool *pool, + u32 last); + +#endif