ASR_BASE

Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/dma-buf/heaps/page_pool.c b/marvell/linux/drivers/dma-buf/heaps/page_pool.c
new file mode 100644
index 0000000..37faab4
--- /dev/null
+++ b/marvell/linux/drivers/dma-buf/heaps/page_pool.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DMA BUF page pool system
+ *
+ * Copyright (C) 2020 Linaro Ltd.
+ *
+ * Based on the ION page pool code
+ * Copyright (C) 2011 Google, Inc.
+ */
+
+#include <linux/freezer.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/sched/signal.h>
+#include "page_pool.h"
+
+static LIST_HEAD(pool_list);
+static DEFINE_MUTEX(pool_list_lock);
+
+static inline
+struct page *dmabuf_page_pool_alloc_pages(struct dmabuf_page_pool *pool)
+{
+	if (fatal_signal_pending(current))
+		return NULL;
+	return alloc_pages(pool->gfp_mask, pool->order);
+}
+
+static inline void dmabuf_page_pool_free_pages(struct dmabuf_page_pool *pool,
+					       struct page *page)
+{
+	__free_pages(page, pool->order);
+}
+
+static void dmabuf_page_pool_add(struct dmabuf_page_pool *pool, struct page *page)
+{
+	int index;
+
+	if (PageHighMem(page))
+		index = POOL_HIGHPAGE;
+	else
+		index = POOL_LOWPAGE;
+
+	mutex_lock(&pool->mutex);
+	list_add_tail(&page->lru, &pool->items[index]);
+	pool->count[index]++;
+	mutex_unlock(&pool->mutex);
+	mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE,
+			    1 << pool->order);
+}
+
+static struct page *dmabuf_page_pool_remove(struct dmabuf_page_pool *pool, int index)
+{
+	struct page *page;
+
+	mutex_lock(&pool->mutex);
+	page = list_first_entry_or_null(&pool->items[index], struct page, lru);
+	if (page) {
+		pool->count[index]--;
+		list_del(&page->lru);
+		mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE,
+				    -(1 << pool->order));
+	}
+	mutex_unlock(&pool->mutex);
+
+	return page;
+}
+
+static struct page *dmabuf_page_pool_fetch(struct dmabuf_page_pool *pool)
+{
+	struct page *page = NULL;
+
+	page = dmabuf_page_pool_remove(pool, POOL_HIGHPAGE);
+	if (!page)
+		page = dmabuf_page_pool_remove(pool, POOL_LOWPAGE);
+
+	return page;
+}
+
+struct page *dmabuf_page_pool_alloc(struct dmabuf_page_pool *pool)
+{
+	struct page *page = NULL;
+
+	if (WARN_ON(!pool))
+		return NULL;
+
+	page = dmabuf_page_pool_fetch(pool);
+
+	if (!page)
+		page = dmabuf_page_pool_alloc_pages(pool);
+	return page;
+}
+EXPORT_SYMBOL_GPL(dmabuf_page_pool_alloc);
+
+void dmabuf_page_pool_free(struct dmabuf_page_pool *pool, struct page *page)
+{
+	if (WARN_ON(pool->order != compound_order(page)))
+		return;
+
+	dmabuf_page_pool_add(pool, page);
+}
+EXPORT_SYMBOL_GPL(dmabuf_page_pool_free);
+
+static int dmabuf_page_pool_total(struct dmabuf_page_pool *pool, bool high)
+{
+	int count = pool->count[POOL_LOWPAGE];
+
+	if (high)
+		count += pool->count[POOL_HIGHPAGE];
+
+	return count << pool->order;
+}
+
+struct dmabuf_page_pool *dmabuf_page_pool_create(gfp_t gfp_mask, unsigned int order)
+{
+	struct dmabuf_page_pool *pool = kmalloc(sizeof(*pool), GFP_KERNEL);
+	int i;
+
+	if (!pool)
+		return NULL;
+
+	for (i = 0; i < POOL_TYPE_SIZE; i++) {
+		pool->count[i] = 0;
+		INIT_LIST_HEAD(&pool->items[i]);
+	}
+	pool->gfp_mask = gfp_mask | __GFP_COMP;
+	pool->order = order;
+	mutex_init(&pool->mutex);
+
+	mutex_lock(&pool_list_lock);
+	list_add(&pool->list, &pool_list);
+	mutex_unlock(&pool_list_lock);
+
+	return pool;
+}
+EXPORT_SYMBOL_GPL(dmabuf_page_pool_create);
+
+void dmabuf_page_pool_destroy(struct dmabuf_page_pool *pool)
+{
+	struct page *page;
+	int i;
+
+	/* Remove us from the pool list */
+	mutex_lock(&pool_list_lock);
+	list_del(&pool->list);
+	mutex_unlock(&pool_list_lock);
+
+	/* Free any remaining pages in the pool */
+	for (i = 0; i < POOL_TYPE_SIZE; i++) {
+		while ((page = dmabuf_page_pool_remove(pool, i)))
+			dmabuf_page_pool_free_pages(pool, page);
+	}
+
+	kfree(pool);
+}
+EXPORT_SYMBOL_GPL(dmabuf_page_pool_destroy);
+
+static int dmabuf_page_pool_do_shrink(struct dmabuf_page_pool *pool, gfp_t gfp_mask,
+				      int nr_to_scan)
+{
+	int freed = 0;
+	bool high;
+
+	if (current_is_kswapd())
+		high = true;
+	else
+		high = !!(gfp_mask & __GFP_HIGHMEM);
+
+	if (nr_to_scan == 0)
+		return dmabuf_page_pool_total(pool, high);
+
+	while (freed < nr_to_scan) {
+		struct page *page;
+
+		/* Try to free low pages first */
+		page = dmabuf_page_pool_remove(pool, POOL_LOWPAGE);
+		if (!page)
+			page = dmabuf_page_pool_remove(pool, POOL_HIGHPAGE);
+
+		if (!page)
+			break;
+
+		dmabuf_page_pool_free_pages(pool, page);
+		freed += (1 << pool->order);
+	}
+
+	return freed;
+}
+
+static int dmabuf_page_pool_shrink(gfp_t gfp_mask, int nr_to_scan)
+{
+	struct dmabuf_page_pool *pool;
+	int nr_total = 0;
+	int nr_freed;
+	int only_scan = 0;
+
+	if (!nr_to_scan)
+		only_scan = 1;
+
+	mutex_lock(&pool_list_lock);
+	list_for_each_entry(pool, &pool_list, list) {
+		if (only_scan) {
+			nr_total += dmabuf_page_pool_do_shrink(pool,
+							       gfp_mask,
+							       nr_to_scan);
+		} else {
+			nr_freed = dmabuf_page_pool_do_shrink(pool,
+							      gfp_mask,
+							      nr_to_scan);
+			nr_to_scan -= nr_freed;
+			nr_total += nr_freed;
+			if (nr_to_scan <= 0)
+				break;
+		}
+	}
+	mutex_unlock(&pool_list_lock);
+
+	return nr_total;
+}
+
+static unsigned long dmabuf_page_pool_shrink_count(struct shrinker *shrinker,
+						   struct shrink_control *sc)
+{
+	return dmabuf_page_pool_shrink(sc->gfp_mask, 0);
+}
+
+static unsigned long dmabuf_page_pool_shrink_scan(struct shrinker *shrinker,
+						  struct shrink_control *sc)
+{
+	if (sc->nr_to_scan == 0)
+		return 0;
+	return dmabuf_page_pool_shrink(sc->gfp_mask, sc->nr_to_scan);
+}
+
+struct shrinker pool_shrinker = {
+	.count_objects = dmabuf_page_pool_shrink_count,
+	.scan_objects = dmabuf_page_pool_shrink_scan,
+	.seeks = DEFAULT_SEEKS,
+	.batch = 0,
+};
+
+static int dmabuf_page_pool_init_shrinker(void)
+{
+	return register_shrinker(&pool_shrinker);
+}
+module_init(dmabuf_page_pool_init_shrinker);
+MODULE_LICENSE("GPL v2");