/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
|
/* vi: set ts=8 sw=8 sts=8: */
|
/*************************************************************************/ /*!
|
@File ion_lma_heap.c
|
@Codingstyle LinuxKernel
|
@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
|
@License Dual MIT/GPLv2
|
|
The contents of this file are subject to the MIT license as set out below.
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
of this software and associated documentation files (the "Software"), to deal
|
in the Software without restriction, including without limitation the rights
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
copies of the Software, and to permit persons to whom the Software is
|
furnished to do so, subject to the following conditions:
|
|
The above copyright notice and this permission notice shall be included in
|
all copies or substantial portions of the Software.
|
|
Alternatively, the contents of this file may be used under the terms of
|
the GNU General Public License Version 2 ("GPL") in which case the provisions
|
of GPL are applicable instead of those above.
|
|
If you wish to allow use of your version of this file only under the terms of
|
GPL, and not to allow others to use your version of this file under the terms
|
of the MIT license, indicate your decision by deleting the provisions above
|
and replace them with the notice and other provisions required by GPL as set
|
out in the file called "GPL-COPYING" included in this distribution. If you do
|
not delete the provisions above, a recipient may use your version of this file
|
under the terms of either the MIT license or GPL.
|
|
This License is also included in this distribution in the file called
|
"MIT-COPYING".
|
|
EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
|
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
|
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
|
PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
|
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
*/ /**************************************************************************/
|
|
#include "ion_lma_heap.h"
|
|
#include <linux/mm.h>
|
#include <linux/slab.h>
|
#include <linux/genalloc.h>
|
#include <linux/scatterlist.h>
|
|
/* Ion heap for LMA allocations. This heap is identical to CARVEOUT except
|
* that it does not do any CPU cache maintenance nor does it zero the memory
|
* using the CPU (this is handled with PVR_ANDROID_DEFER_CLEAR in userspace).
|
*/
|
|
struct ion_lma_heap {
|
struct ion_heap heap;
|
struct gen_pool *pool;
|
ion_phys_addr_t base;
|
bool allow_cpu_map;
|
};
|
|
static ion_phys_addr_t ion_lma_allocate(struct ion_heap *heap,
|
unsigned long size,
|
unsigned long align)
|
{
|
struct ion_lma_heap *lma_heap =
|
container_of(heap, struct ion_lma_heap, heap);
|
unsigned long offset = gen_pool_alloc(lma_heap->pool, size);
|
|
if (!offset)
|
return ION_CARVEOUT_ALLOCATE_FAIL;
|
|
return offset;
|
}
|
|
static void ion_lma_free(struct ion_heap *heap, ion_phys_addr_t addr,
|
unsigned long size)
|
{
|
struct ion_lma_heap *lma_heap =
|
container_of(heap, struct ion_lma_heap, heap);
|
|
if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
|
return;
|
|
gen_pool_free(lma_heap->pool, addr, size);
|
}
|
|
static int ion_lma_heap_phys(struct ion_heap *heap,
|
struct ion_buffer *buffer,
|
ion_phys_addr_t *addr, size_t *len)
|
{
|
struct sg_table *table = buffer->priv_virt;
|
struct page *page = sg_page(table->sgl);
|
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
|
|
*addr = paddr;
|
*len = buffer->size;
|
return 0;
|
}
|
|
static int ion_lma_heap_allocate(struct ion_heap *heap,
|
struct ion_buffer *buffer,
|
unsigned long size, unsigned long align,
|
unsigned long flags)
|
{
|
struct sg_table *table;
|
ion_phys_addr_t paddr;
|
int ret;
|
|
if (align > PAGE_SIZE)
|
return -EINVAL;
|
|
table = kzalloc(sizeof(*table), GFP_KERNEL);
|
if (!table)
|
return -ENOMEM;
|
|
ret = sg_alloc_table(table, 1, GFP_KERNEL);
|
if (ret)
|
goto err_free;
|
|
paddr = ion_lma_allocate(heap, size, align);
|
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->priv_virt = table;
|
return 0;
|
|
err_free_table:
|
sg_free_table(table);
|
err_free:
|
kfree(table);
|
return ret;
|
}
|
|
static void ion_lma_heap_free(struct ion_buffer *buffer)
|
{
|
struct ion_heap *heap = buffer->heap;
|
struct sg_table *table = buffer->priv_virt;
|
struct page *page = sg_page(table->sgl);
|
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
|
|
/* Do not zero the LMA heap from the CPU. This is very slow with
|
* the current TCF (w/ no DMA engine). We will use the TLA to clear
|
* the memory with Rogue in another place.
|
*
|
* We also skip the CPU cache maintenance for the heap space, as we
|
* statically know that the TCF PCI memory bar has UC/WC set by the
|
* MTRR/PAT subsystem.
|
*/
|
|
ion_lma_free(heap, paddr, buffer->size);
|
sg_free_table(table);
|
kfree(table);
|
}
|
|
static struct sg_table *ion_lma_heap_map_dma(struct ion_heap *heap,
|
struct ion_buffer *buffer)
|
{
|
return buffer->priv_virt;
|
}
|
|
static void ion_lma_heap_unmap_dma(struct ion_heap *heap,
|
struct ion_buffer *buffer)
|
{
|
/* No-op */
|
}
|
|
static int ion_lma_heap_map_user(struct ion_heap *mapper,
|
struct ion_buffer *buffer,
|
struct vm_area_struct *vma)
|
{
|
struct sg_table *table = buffer->priv_virt;
|
struct page *page = sg_page(table->sgl);
|
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
|
struct ion_lma_heap *lma_heap =
|
container_of(mapper, struct ion_lma_heap, heap);
|
|
if (!lma_heap->allow_cpu_map) {
|
pr_err("Trying to map_user fake secure ION handle\n");
|
return -EPERM;
|
}
|
|
return remap_pfn_range(vma, vma->vm_start,
|
PFN_DOWN(paddr) + vma->vm_pgoff,
|
vma->vm_end - vma->vm_start,
|
pgprot_writecombine(vma->vm_page_prot));
|
}
|
|
static void *ion_lma_heap_map_kernel(struct ion_heap *heap,
|
struct ion_buffer *buffer)
|
{
|
struct sg_table *table = buffer->priv_virt;
|
struct page *page = sg_page(table->sgl);
|
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
|
struct ion_lma_heap *lma_heap =
|
container_of(heap, struct ion_lma_heap, heap);
|
|
if (!lma_heap->allow_cpu_map) {
|
pr_err("Trying to map_kernel fake secure ION handle\n");
|
return ERR_PTR(-EPERM);
|
}
|
|
return ioremap_wc(paddr, buffer->size);
|
}
|
|
static void ion_lma_heap_unmap_kernel(struct ion_heap *heap,
|
struct ion_buffer *buffer)
|
{
|
iounmap(buffer->vaddr);
|
}
|
|
static struct ion_heap_ops lma_heap_ops = {
|
.allocate = ion_lma_heap_allocate,
|
.free = ion_lma_heap_free,
|
.phys = ion_lma_heap_phys,
|
.map_dma = ion_lma_heap_map_dma,
|
.unmap_dma = ion_lma_heap_unmap_dma,
|
.map_user = ion_lma_heap_map_user,
|
.map_kernel = ion_lma_heap_map_kernel,
|
.unmap_kernel = ion_lma_heap_unmap_kernel,
|
};
|
|
struct ion_heap *ion_lma_heap_create(struct ion_platform_heap *heap_data,
|
bool allow_cpu_map)
|
{
|
struct ion_lma_heap *lma_heap;
|
size_t size = heap_data->size;
|
struct page *page;
|
|
page = pfn_to_page(PFN_DOWN(heap_data->base));
|
|
/* Do not zero the LMA heap from the CPU. This is very slow with
|
* the current TCF (w/ no DMA engine). We will use the TLA to clear
|
* the memory with Rogue in another place.
|
*
|
* We also skip the CPU cache maintenance for the heap space, as we
|
* statically know that the TCF PCI memory bar has UC/WC set by the
|
* MTRR/PAT subsystem.
|
*/
|
|
lma_heap = kzalloc(sizeof(*lma_heap), GFP_KERNEL);
|
if (!lma_heap)
|
return ERR_PTR(-ENOMEM);
|
|
lma_heap->pool = gen_pool_create(12, -1);
|
if (!lma_heap->pool) {
|
kfree(lma_heap);
|
return ERR_PTR(-ENOMEM);
|
}
|
|
lma_heap->base = heap_data->base;
|
gen_pool_add(lma_heap->pool, lma_heap->base, size, -1);
|
|
lma_heap->heap.id = heap_data->id;
|
lma_heap->heap.ops = &lma_heap_ops;
|
lma_heap->heap.name = heap_data->name;
|
lma_heap->heap.type = ION_HEAP_TYPE_CUSTOM;
|
lma_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
|
|
lma_heap->allow_cpu_map = allow_cpu_map;
|
|
return &lma_heap->heap;
|
}
|
|
void ion_lma_heap_destroy(struct ion_heap *heap)
|
{
|
struct ion_lma_heap *lma_heap =
|
container_of(heap, struct ion_lma_heap, heap);
|
gen_pool_destroy(lma_heap->pool);
|
kfree(lma_heap);
|
lma_heap = NULL;
|
}
|
