| /* |
| * drivers/staging/android/ion/ion_system_mapper.c |
| * |
| * Copyright (C) 2011 Google, Inc. |
| * |
| * 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. |
| * |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/memory.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include "ion.h" |
| #include "ion_priv.h" |
| /* |
| * This mapper is valid for any heap that allocates memory that already has |
| * a kernel mapping, this includes vmalloc'd memory, kmalloc'd memory, |
| * pages obtained via io_remap, etc. |
| */ |
| static void *ion_kernel_mapper_map(struct ion_mapper *mapper, |
| struct ion_buffer *buffer, |
| struct ion_mapping **mapping) |
| { |
| if (!((1 << buffer->heap->type) & mapper->heap_mask)) { |
| pr_err("%s: attempting to map an unsupported heap\n", __func__); |
| return ERR_PTR(-EINVAL); |
| } |
| /* XXX REVISIT ME!!! */ |
| *((unsigned long *)mapping) = (unsigned long)buffer->priv; |
| return buffer->priv; |
| } |
| |
| static void ion_kernel_mapper_unmap(struct ion_mapper *mapper, |
| struct ion_buffer *buffer, |
| struct ion_mapping *mapping) |
| { |
| if (!((1 << buffer->heap->type) & mapper->heap_mask)) |
| pr_err("%s: attempting to unmap an unsupported heap\n", |
| __func__); |
| } |
| |
| static void *ion_kernel_mapper_map_kernel(struct ion_mapper *mapper, |
| struct ion_buffer *buffer, |
| struct ion_mapping *mapping) |
| { |
| if (!((1 << buffer->heap->type) & mapper->heap_mask)) { |
| pr_err("%s: attempting to unmap an unsupported heap\n", |
| __func__); |
| return ERR_PTR(-EINVAL); |
| } |
| return buffer->priv; |
| } |
| |
| static int ion_kernel_mapper_map_user(struct ion_mapper *mapper, |
| struct ion_buffer *buffer, |
| struct vm_area_struct *vma, |
| struct ion_mapping *mapping) |
| { |
| int ret; |
| |
| switch (buffer->heap->type) { |
| case ION_HEAP_KMALLOC: |
| { |
| unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv)); |
| ret = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, |
| vma->vm_end - vma->vm_start, |
| vma->vm_page_prot); |
| break; |
| } |
| case ION_HEAP_VMALLOC: |
| ret = remap_vmalloc_range(vma, buffer->priv, vma->vm_pgoff); |
| break; |
| default: |
| pr_err("%s: attempting to map unsupported heap to userspace\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static struct ion_mapper_ops ops = { |
| .map = ion_kernel_mapper_map, |
| .map_kernel = ion_kernel_mapper_map_kernel, |
| .map_user = ion_kernel_mapper_map_user, |
| .unmap = ion_kernel_mapper_unmap, |
| }; |
| |
| struct ion_mapper *ion_system_mapper_create(void) |
| { |
| struct ion_mapper *mapper; |
| mapper = kzalloc(sizeof(struct ion_mapper), GFP_KERNEL); |
| if (!mapper) |
| return ERR_PTR(-ENOMEM); |
| mapper->type = ION_SYSTEM_MAPPER; |
| mapper->ops = &ops; |
| mapper->heap_mask = (1 << ION_HEAP_VMALLOC) | (1 << ION_HEAP_KMALLOC); |
| return mapper; |
| } |
| |
| void ion_system_mapper_destroy(struct ion_mapper *mapper) |
| { |
| kfree(mapper); |
| } |
| |