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/*
* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @file ump_osk_memory.c
* Implementation of the OS abstraction layer for the kernel device driver
*/
/* needed to detect kernel version specific code */
#include <linux/version.h>
#include "ump_osk.h"
#include "ump_uk_types.h"
#include "ump_ukk.h"
#include "ump_kernel_common.h"
#include <linux/module.h> /* kernel module definitions */
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/memory.h>
#include <asm/cacheflush.h>
#include <linux/dma-mapping.h>
typedef struct ump_vma_usage_tracker
{
atomic_t references;
ump_memory_allocation *descriptor;
} ump_vma_usage_tracker;
static void ump_vma_open(struct vm_area_struct * vma);
static void ump_vma_close(struct vm_area_struct * vma);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
static int ump_cpu_page_fault_handler(struct vm_area_struct *vma, struct vm_fault *vmf);
#else
static unsigned long ump_cpu_page_fault_handler(struct vm_area_struct * vma, unsigned long address);
#endif
static struct vm_operations_struct ump_vm_ops =
{
.open = ump_vma_open,
.close = ump_vma_close,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
.fault = ump_cpu_page_fault_handler
#else
.nopfn = ump_cpu_page_fault_handler
#endif
};
/*
* Page fault for VMA region
* This should never happen since we always map in the entire virtual memory range.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
static int ump_cpu_page_fault_handler(struct vm_area_struct *vma, struct vm_fault *vmf)
#else
static unsigned long ump_cpu_page_fault_handler(struct vm_area_struct * vma, unsigned long address)
#endif
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
void __user * address;
address = vmf->virtual_address;
#endif
MSG_ERR(("Page-fault in UMP memory region caused by the CPU\n"));
MSG_ERR(("VMA: 0x%08lx, virtual address: 0x%08lx\n", (unsigned long)vma, address));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
return VM_FAULT_SIGBUS;
#else
return NOPFN_SIGBUS;
#endif
}
static void ump_vma_open(struct vm_area_struct * vma)
{
ump_vma_usage_tracker * vma_usage_tracker;
int new_val;
vma_usage_tracker = (ump_vma_usage_tracker*)vma->vm_private_data;
BUG_ON(NULL == vma_usage_tracker);
new_val = atomic_inc_return(&vma_usage_tracker->references);
DBG_MSG(4, ("VMA open, VMA reference count incremented. VMA: 0x%08lx, reference count: %d\n", (unsigned long)vma, new_val));
}
static void ump_vma_close(struct vm_area_struct * vma)
{
ump_vma_usage_tracker * vma_usage_tracker;
_ump_uk_unmap_mem_s args;
int new_val;
vma_usage_tracker = (ump_vma_usage_tracker*)vma->vm_private_data;
BUG_ON(NULL == vma_usage_tracker);
new_val = atomic_dec_return(&vma_usage_tracker->references);
DBG_MSG(4, ("VMA close, VMA reference count decremented. VMA: 0x%08lx, reference count: %d\n", (unsigned long)vma, new_val));
if (0 == new_val)
{
ump_memory_allocation * descriptor;
descriptor = vma_usage_tracker->descriptor;
args.ctx = descriptor->ump_session;
args.cookie = descriptor->cookie;
args.mapping = descriptor->mapping;
args.size = descriptor->size;
args._ukk_private = NULL; /** @note unused */
DBG_MSG(4, ("No more VMA references left, releasing UMP memory\n"));
_ump_ukk_unmap_mem( & args );
/* vma_usage_tracker is free()d by _ump_osk_mem_mapregion_term() */
}
}
_mali_osk_errcode_t _ump_osk_mem_mapregion_init( ump_memory_allocation * descriptor )
{
ump_vma_usage_tracker * vma_usage_tracker;
struct vm_area_struct *vma;
if (NULL == descriptor) return _MALI_OSK_ERR_FAULT;
vma_usage_tracker = kmalloc(sizeof(ump_vma_usage_tracker), GFP_KERNEL);
if (NULL == vma_usage_tracker)
{
DBG_MSG(1, ("Failed to allocate memory for ump_vma_usage_tracker in _mali_osk_mem_mapregion_init\n"));
return -_MALI_OSK_ERR_FAULT;
}
vma = (struct vm_area_struct*)descriptor->process_mapping_info;
if (NULL == vma ) return _MALI_OSK_ERR_FAULT;
vma->vm_private_data = vma_usage_tracker;
vma->vm_flags |= VM_IO;
vma->vm_flags |= VM_RESERVED;
if (0==descriptor->is_cached)
{
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
}
DBG_MSG(3, ("Mapping with page_prot: 0x%x\n", vma->vm_page_prot ));
/* Setup the functions which handle further VMA handling */
vma->vm_ops = &ump_vm_ops;
/* Do the va range allocation - in this case, it was done earlier, so we copy in that information */
descriptor->mapping = (void __user*)vma->vm_start;
atomic_set(&vma_usage_tracker->references, 1); /*this can later be increased if process is forked, see ump_vma_open() */
vma_usage_tracker->descriptor = descriptor;
return _MALI_OSK_ERR_OK;
}
void _ump_osk_mem_mapregion_term( ump_memory_allocation * descriptor )
{
struct vm_area_struct* vma;
ump_vma_usage_tracker * vma_usage_tracker;
if (NULL == descriptor) return;
/* Linux does the right thing as part of munmap to remove the mapping
* All that remains is that we remove the vma_usage_tracker setup in init() */
vma = (struct vm_area_struct*)descriptor->process_mapping_info;
vma_usage_tracker = vma->vm_private_data;
/* We only get called if mem_mapregion_init succeeded */
kfree(vma_usage_tracker);
return;
}
_mali_osk_errcode_t _ump_osk_mem_mapregion_map( ump_memory_allocation * descriptor, u32 offset, u32 * phys_addr, unsigned long size )
{
struct vm_area_struct *vma;
_mali_osk_errcode_t retval;
if (NULL == descriptor) return _MALI_OSK_ERR_FAULT;
vma = (struct vm_area_struct*)descriptor->process_mapping_info;
if (NULL == vma ) return _MALI_OSK_ERR_FAULT;
retval = remap_pfn_range( vma, ((u32)descriptor->mapping) + offset, (*phys_addr) >> PAGE_SHIFT, size, vma->vm_page_prot) ? _MALI_OSK_ERR_FAULT : _MALI_OSK_ERR_OK;;
DBG_MSG(4, ("Mapping virtual to physical memory. ID: %u, vma: 0x%08lx, virtual addr:0x%08lx, physical addr: 0x%08lx, size:%lu, prot:0x%x, vm_flags:0x%x RETVAL: 0x%x\n",
ump_dd_secure_id_get(descriptor->handle),
(unsigned long)vma,
(unsigned long)(vma->vm_start + offset),
(unsigned long)*phys_addr,
size,
(unsigned int)vma->vm_page_prot, vma->vm_flags, retval));
return retval;
}
void _ump_osk_msync( ump_dd_mem * mem, ump_uk_msync_op op )
{
int i;
DBG_MSG(3, ("Flushing nr of blocks: %u. First: paddr: 0x%08x vaddr: 0x%08x size:%dB\n", mem->nr_blocks, mem->block_array[0].addr, phys_to_virt(mem->block_array[0].addr), mem->block_array[0].size));
/* TODO: Use args->size and args->address to select a subrange of this allocation to flush */
for (i=0 ; i<mem->nr_blocks; i++)
{
/* TODO: Find out which flush method is best of 1)Dma OR 2)Normal flush functions */
/* TODO: Use args->op to select the flushing method: CLEAN_AND_INVALIDATE or CLEAN */
/*#define USING_DMA_FLUSH*/
#ifdef USING_DMA_FLUSH
DEBUG_ASSERT( (PAGE_SIZE==mem->block_array[i].size));
dma_map_page(NULL, pfn_to_page(mem->block_array[i].addr >> PAGE_SHIFT), 0, PAGE_SIZE, DMA_BIDIRECTIONAL );
/*dma_unmap_page(NULL, mem->block_array[i].addr, PAGE_SIZE, DMA_BIDIRECTIONAL);*/
#else
/* Normal style flush */
ump_dd_physical_block *block;
u32 start_p, end_p;
const void *start_v, *end_v;
block = &mem->block_array[i];
start_p = (u32)block->addr;
start_v = phys_to_virt( start_p ) ;
end_p = start_p + block->size-1;
end_v = phys_to_virt( end_p ) ;
dmac_flush_range(start_v, end_v);
outer_flush_range(start_p, end_p);
#endif
}
return ;
}
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