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/*
* arch/arm/mach-tegra/nvos/nvos_page.c
*
* Implementation of NvOsPage* APIs using the Linux page allocator
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include "nvcommon.h"
#include "nvos.h"
#define nv_gfp_pool (GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN)
struct nvos_pagemap {
void *addr;
unsigned int nr_pages;
struct page *pages[1];
};
static void pagemap_flush_page(struct page *page)
{
#ifdef CONFIG_HIGHMEM
void *km = NULL;
if (!page_address(page)) {
km = kmap(page);
if (!km) {
pr_err("unable to map high page\n");
return;
}
}
#endif
__cpuc_flush_dcache_page(page_address(page));
outer_flush_range(page_to_phys(page), page_to_phys(page)+PAGE_SIZE);
dsb();
#ifdef CONFIG_HIGHMEM
if (km) kunmap(page);
#endif
}
static void nv_free_pages(struct nvos_pagemap *pm)
{
unsigned int i;
if (pm->addr) vm_unmap_ram(pm->addr, pm->nr_pages);
for (i=0; i<pm->nr_pages; i++) {
ClearPageReserved(pm->pages[i]);
__free_page(pm->pages[i]);
}
kfree(pm);
}
static struct nvos_pagemap *nv_alloc_pages(unsigned int count,
pgprot_t prot, bool contiguous, int create_mapping)
{
struct nvos_pagemap *pm;
size_t size;
unsigned int i = 0;
size = sizeof(struct nvos_pagemap) + sizeof(struct page *)*(count-1);
pm = kzalloc(size, GFP_KERNEL);
if (!pm)
return NULL;
if (count==1) contiguous = true;
if (contiguous) {
size_t order = get_order(count << PAGE_SHIFT);
struct page *compound_page;
compound_page = alloc_pages(nv_gfp_pool, order);
if (!compound_page) goto fail;
split_page(compound_page, order);
for (i=0; i<count; i++)
pm->pages[i] = nth_page(compound_page, i);
for ( ; i < (1<<order); i++)
__free_page(nth_page(compound_page, i));
} else {
for (i=0; i<count; i++) {
pm->pages[i] = alloc_page(nv_gfp_pool);
if (!pm->pages[i]) goto fail;
}
}
if (create_mapping) {
/* since the linear kernel mapping uses sections and super-
* sections rather than PTEs, it's not possible to overwrite
* it with the correct caching attributes, so use a local
* mapping */
pm->addr = vm_map_ram(pm->pages, count, -1, prot);
if (!pm->addr) {
pr_err("nv_alloc_pages fail to vmap contiguous area\n");
goto fail;
}
}
pm->nr_pages = count;
for (i=0; i<count; i++) {
SetPageReserved(pm->pages[i]);
pagemap_flush_page(pm->pages[i]);
}
return pm;
fail:
while (i) __free_page(pm->pages[--i]);
if (pm) kfree(pm);
return NULL;
}
NvError NvOsPageMap(NvOsPageAllocHandle desc, size_t offs,
size_t size, void **ptr)
{
struct nvos_pagemap *pm = (struct nvos_pagemap *)desc;
if (!desc || !ptr || !size)
return NvError_BadParameter;
if (pm->addr) *ptr = (void*)((unsigned long)pm->addr + offs);
else *ptr = NULL;
return (*ptr) ? NvSuccess : NvError_MemoryMapFailed;
}
struct page *NvOsPageGetPage(NvOsPageAllocHandle desc, size_t offs)
{
struct nvos_pagemap *pm = (struct nvos_pagemap *)desc;
if (!pm) return NULL;
offs >>= PAGE_SHIFT;
return (likely(offs<pm->nr_pages)) ? pm->pages[offs] : NULL;
}
NvOsPhysAddr NvOsPageAddress(NvOsPageAllocHandle desc, size_t offs)
{
struct nvos_pagemap *pm = (struct nvos_pagemap *)desc;
size_t index;
if (unlikely(!pm)) return (NvOsPhysAddr)0;
index = offs >> PAGE_SHIFT;
offs &= (PAGE_SIZE - 1);
return (NvOsPhysAddr)(page_to_phys(pm->pages[index]) + offs);
}
void NvOsPageUnmap(NvOsPageAllocHandle desc, void *ptr, size_t size)
{
return;
}
NvError NvOsPageAlloc(size_t size, NvOsMemAttribute attrib,
NvOsPageFlags flags, NvU32 protect, NvOsPageAllocHandle *desc)
{
struct nvos_pagemap *pm;
pgprot_t prot = pgprot_kernel;
size += PAGE_SIZE-1;
size >>= PAGE_SHIFT;
/* writeback is implemented as inner-cacheable only, since these
* allocators are only used to allocate buffers for DMA-driven
* clients, and the cost of L2 maintenance makes outer cacheability
* a net performance loss more often than not */
if (attrib == NvOsMemAttribute_WriteBack)
prot = pgprot_inner_writeback(prot);
else
prot = pgprot_writecombine(prot);
pm = nv_alloc_pages(size, prot, (flags==NvOsPageFlags_Contiguous), 1);
if (!pm) return NvError_InsufficientMemory;
*desc = (NvOsPageAllocHandle)pm;
return NvSuccess;
}
void NvOsPageFree(NvOsPageAllocHandle desc)
{
struct nvos_pagemap *pm = (struct nvos_pagemap *)desc;
if (pm) nv_free_pages(pm);
}
NvError NvOsPageLock(void *ptr, size_t size, NvU32 protect,
NvOsPageAllocHandle *descriptor)
{
return NvError_NotImplemented;
}
NvError NvOsPageMapIntoPtr(NvOsPageAllocHandle desc, void *ptr,
size_t offset, size_t size)
{
return NvError_NotImplemented;
}
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