diff options
Diffstat (limited to 'drivers/staging/android/ion/ion_unmapped_heap.c')
| -rw-r--r-- | drivers/staging/android/ion/ion_unmapped_heap.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/staging/android/ion/ion_unmapped_heap.c b/drivers/staging/android/ion/ion_unmapped_heap.c new file mode 100644 index 000000000000..21f6c13571d1 --- /dev/null +++ b/drivers/staging/android/ion/ion_unmapped_heap.c @@ -0,0 +1,236 @@ +/* + * drivers/staging/android/ion/ion_unmapped_heap.c + * + * Copyright (C) 2016-2017 Linaro, Inc. + * Copyright (C) Allwinner 2014 + * Author: <sunny@allwinnertech.com> for Allwinner. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +/* + * ION heap type for handling physical memory heap not mapped + * in the linux-based OS. + * + * "unmapped heap" buffers are default not mapped but buffer owner + * can explicitly request mapping for some specific purpose. + * + * Based on Allwinner work (allocation thru gen_pool) and + * HiSilicon work (create ION heaps from DT nodes, + * Author: Chen Feng <puck.chen@hisilicon.com>). + */ + +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/genalloc.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/version.h> +#include <linux/vmalloc.h> + +#include "ion.h" +#include "ion_priv.h" + +struct ion_unmapped_heap { + struct ion_heap heap; + struct gen_pool *pool; + ion_phys_addr_t base; + size_t size; +}; + +struct unmapped_buffer_priv { + ion_phys_addr_t base; +}; + +static ion_phys_addr_t get_buffer_base(struct unmapped_buffer_priv *priv) +{ + return priv->base; +} + +static struct device *heap2dev(struct ion_heap *heap) +{ + return heap->dev->dev.this_device; +} + +static ion_phys_addr_t ion_unmapped_allocate(struct ion_heap *heap, + unsigned long size, + unsigned long align, + ion_phys_addr_t *addr) +{ + struct ion_unmapped_heap *umh = + container_of(heap, struct ion_unmapped_heap, heap); + unsigned long offset = gen_pool_alloc(umh->pool, size); + + if (!offset) { + dev_err(heap2dev(heap), + "%s(%d) err: alloc 0x%08x bytes failed\n", + __func__, __LINE__, (u32)size); + return false; + } + + *addr = offset; + return true; +} + +static void ion_unmapped_free(struct ion_heap *heap, ion_phys_addr_t addr, + unsigned long size) +{ + struct ion_unmapped_heap *umh = + container_of(heap, struct ion_unmapped_heap, heap); + + gen_pool_free(umh->pool, addr, size); +} + +static struct sg_table *ion_unmapped_heap_map_dma(struct ion_heap *heap, + struct ion_buffer *buffer) +{ + struct sg_table *table; + int ret; + + table = kzalloc(sizeof(struct sg_table), GFP_KERNEL); + if (!table) + return ERR_PTR(-ENOMEM); + ret = sg_alloc_table(table, 1, GFP_KERNEL); + if (ret) { + kfree(table); + return ERR_PTR(ret); + } + sg_set_page(table->sgl, + phys_to_page(get_buffer_base(buffer->priv_virt)), + buffer->size, 0); + + return table; +} + +void ion_unmapped_heap_unmap_dma(struct ion_heap *heap, + struct ion_buffer *buffer) +{ + sg_free_table(buffer->sg_table); + kfree(buffer->sg_table); +} + + +static int ion_unmapped_heap_allocate(struct ion_heap *heap, + struct ion_buffer *buffer, + unsigned long size, unsigned long align, + unsigned long flags) +{ + struct unmapped_buffer_priv *priv; + ion_phys_addr_t base; + int rc = -EINVAL; + + if (!ion_unmapped_allocate(heap, size, align, &base)) + return -ENOMEM; + + priv = devm_kzalloc(heap2dev(heap), sizeof(*priv), GFP_KERNEL); + if (IS_ERR_OR_NULL(priv)) { + rc = -ENOMEM; + goto err; + } + + priv->base = base; + buffer->size = roundup(size, PAGE_SIZE); + buffer->priv_virt = priv; + + buffer->sg_table = ion_unmapped_heap_map_dma(heap, buffer); + if (!buffer->sg_table) { + rc = -ENOMEM; + goto err; + } + sg_dma_address(buffer->sg_table->sgl) = priv->base; + sg_dma_len(buffer->sg_table->sgl) = size; + return 0; +err: + ion_unmapped_free(heap, base, size); + devm_kfree(heap2dev(heap), priv); + buffer->priv_virt = NULL; + return rc; +} + +static void ion_unmapped_heap_free(struct ion_buffer *buffer) +{ + struct ion_heap *heap = buffer->heap; + + + ion_unmapped_heap_unmap_dma(heap, buffer); + ion_unmapped_free(heap, get_buffer_base(buffer->priv_virt), + buffer->size); + devm_kfree(heap2dev(heap), buffer->priv_virt); + buffer->priv_virt = NULL; +} + +static int ion_unmapped_heap_map_user(struct ion_heap *heap, + struct ion_buffer *buffer, + struct vm_area_struct *vma) +{ + ion_phys_addr_t pa = get_buffer_base(buffer->priv_virt); + + /* + * when user call ION_IOC_ALLOC not with ION_FLAG_CACHED, ion_mmap will + * change vma->vm_page_prot to pgprot_writecombine itself, so we do not + * need change to pgprot_writecombine here manually. + */ + return remap_pfn_range(vma, vma->vm_start, + __phys_to_pfn(pa) + vma->vm_pgoff, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); +} + +static struct ion_heap_ops unmapped_heap_ops = { + .allocate = ion_unmapped_heap_allocate, + .free = ion_unmapped_heap_free, + .map_user = ion_unmapped_heap_map_user, + .map_kernel = ion_heap_map_kernel, + .unmap_kernel = ion_heap_unmap_kernel, +}; + +struct ion_heap *ion_unmapped_heap_create(struct ion_platform_heap *pheap) +{ + struct ion_unmapped_heap *umh; + + if (pheap->type != ION_HEAP_TYPE_UNMAPPED) + return NULL; + + umh = kzalloc(sizeof(struct ion_unmapped_heap), GFP_KERNEL); + if (!umh) + return ERR_PTR(-ENOMEM); + + umh->pool = gen_pool_create(PAGE_SHIFT, -1); + if (!umh->pool) { + kfree(umh); + return ERR_PTR(-ENOMEM); + } + umh->base = pheap->base; + umh->size = pheap->size; + + gen_pool_add(umh->pool, umh->base, pheap->size, -1); + umh->heap.ops = &unmapped_heap_ops; + umh->heap.type = ION_HEAP_TYPE_UNMAPPED; + + return &umh->heap; +} +EXPORT_SYMBOL(ion_unmapped_heap_create); + +void ion_unmapped_heap_destroy(struct ion_heap *heap) +{ + struct ion_unmapped_heap *umh = + container_of(heap, struct ion_unmapped_heap, heap); + + gen_pool_destroy(umh->pool); + kfree(umh); + umh = NULL; +} +EXPORT_SYMBOL(ion_unmapped_heap_destroy); |