staging: android: ion: Remove file ion_carveout_heap.c

Remove file ion_carveout_heap.c as its functions and definitions are not
used anywhere.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Link: https://lore.kernel.org/r/20190703081842.22872-1-nishkadg.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/Kconfig

@@ -18,15 +18,6 @@ config ION_SYSTEM_HEAP
 	  Choose this option to enable the Ion system heap. The system heap
 	  is backed by pages from the buddy allocator. If in doubt, say Y.
 
-config ION_CARVEOUT_HEAP
-	bool "Ion carveout heap support"
-	depends on ION
-	help
-	  Choose this option to enable carveout heaps with Ion. Carveout heaps
-	  are backed by memory reserved from the system. Allocation times are
-	  typically faster at the cost of memory not being used. Unless you
-	  know your system has these regions, you should say N here.
-
 config ION_CHUNK_HEAP
 	bool "Ion chunk heap support"
 	depends on ION

drivers/staging/android/ion/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_ION) += ion.o ion_heap.o
 obj-$(CONFIG_ION_SYSTEM_HEAP) += ion_system_heap.o ion_page_pool.o
-obj-$(CONFIG_ION_CARVEOUT_HEAP) += ion_carveout_heap.o
 obj-$(CONFIG_ION_CHUNK_HEAP) += ion_chunk_heap.o
 obj-$(CONFIG_ION_CMA_HEAP) += ion_cma_heap.o

drivers/staging/android/ion/ion_carveout_heap.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * ION Memory Allocator carveout heap helper
- *
- * Copyright (C) 2011 Google, Inc.
- */
-
-#include <linux/dma-mapping.h>
-#include <linux/err.h>
-#include <linux/genalloc.h>
-#include <linux/io.h>
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-#include "ion.h"
-
-#define ION_CARVEOUT_ALLOCATE_FAIL	-1
-
-struct ion_carveout_heap {
-	struct ion_heap heap;
-	struct gen_pool *pool;
-};
-
-static phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
-					 unsigned long size)
-{
-	struct ion_carveout_heap *carveout_heap =
-		container_of(heap, struct ion_carveout_heap, heap);
-	unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
-
-	if (!offset)
-		return ION_CARVEOUT_ALLOCATE_FAIL;
-
-	return offset;
-}
-
-static void ion_carveout_free(struct ion_heap *heap, phys_addr_t addr,
-			      unsigned long size)
-{
-	struct ion_carveout_heap *carveout_heap =
-		container_of(heap, struct ion_carveout_heap, heap);
-
-	if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
-		return;
-
-	gen_pool_free(carveout_heap->pool, addr, size);
-}
-
-static int ion_carveout_heap_allocate(struct ion_heap *heap,
-				      struct ion_buffer *buffer,
-				      unsigned long size,
-				      unsigned long flags)
-{
-	struct sg_table *table;
-	phys_addr_t paddr;
-	int ret;
-
-	table = kmalloc(sizeof(*table), GFP_KERNEL);
-	if (!table)
-		return -ENOMEM;
-	ret = sg_alloc_table(table, 1, GFP_KERNEL);
-	if (ret)
-		goto err_free;
-
-	paddr = ion_carveout_allocate(heap, size);
-	if (paddr == ION_CARVEOUT_ALLOCATE_FAIL) {
-		ret = -ENOMEM;
-		goto err_free_table;
-	}
-
-	sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(paddr)), size, 0);
-	buffer->sg_table = table;
-
-	return 0;
-
-err_free_table:
-	sg_free_table(table);
-err_free:
-	kfree(table);
-	return ret;
-}
-
-static void ion_carveout_heap_free(struct ion_buffer *buffer)
-{
-	struct ion_heap *heap = buffer->heap;
-	struct sg_table *table = buffer->sg_table;
-	struct page *page = sg_page(table->sgl);
-	phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
-
-	ion_heap_buffer_zero(buffer);
-
-	ion_carveout_free(heap, paddr, buffer->size);
-	sg_free_table(table);
-	kfree(table);
-}
-
-static struct ion_heap_ops carveout_heap_ops = {
-	.allocate = ion_carveout_heap_allocate,
-	.free = ion_carveout_heap_free,
-	.map_user = ion_heap_map_user,
-	.map_kernel = ion_heap_map_kernel,
-	.unmap_kernel = ion_heap_unmap_kernel,
-};
-
-struct ion_heap *ion_carveout_heap_create(phys_addr_t base, size_t size)
-{
-	struct ion_carveout_heap *carveout_heap;
-	int ret;
-
-	struct page *page;
-
-	page = pfn_to_page(PFN_DOWN(base));
-	ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
-	if (ret)
-		return ERR_PTR(ret);
-
-	carveout_heap = kzalloc(sizeof(*carveout_heap), GFP_KERNEL);
-	if (!carveout_heap)
-		return ERR_PTR(-ENOMEM);
-
-	carveout_heap->pool = gen_pool_create(PAGE_SHIFT, -1);
-	if (!carveout_heap->pool) {
-		kfree(carveout_heap);
-		return ERR_PTR(-ENOMEM);
-	}
-	gen_pool_add(carveout_heap->pool, base, size, -1);
-	carveout_heap->heap.ops = &carveout_heap_ops;
-	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
-	carveout_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
-
-	return &carveout_heap->heap;
-}