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mm_aspace.c
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-14 WangXiaoyao the first version
* 2023-08-17 Shell Add unmap_range for MAP_PRIVATE
* Support MAP_FIXED in aspace_map(), and
* Add better support of permission in mmap
*/
/**
* @brief Virtual Address Space
*/
#include <rtthread.h>
#define DBG_TAG "mm.aspace"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include "avl_adpt.h"
#include "mm_private.h"
#include <mmu.h>
#include <tlb.h>
#include <stddef.h>
#include <stdint.h>
#define ALIGNED(addr) (!((rt_size_t)(addr) & ARCH_PAGE_MASK))
static void *_find_free(rt_aspace_t aspace, void *prefer, rt_size_t req_size,
void *limit_start, rt_size_t limit_size,
mm_flag_t flags);
static int _unmap_range_locked(rt_aspace_t aspace, void *addr, size_t length);
struct rt_aspace rt_kernel_space;
static int _init_lock(rt_aspace_t aspace)
{
int err;
MM_PGTBL_LOCK_INIT(aspace);
err = rt_mutex_init(&aspace->bst_lock, "aspace", RT_IPC_FLAG_FIFO);
return err;
}
rt_err_t rt_aspace_init(rt_aspace_t aspace, void *start, rt_size_t length, void *pgtbl)
{
int err = RT_EOK;
if (pgtbl)
{
aspace->page_table = pgtbl;
aspace->start = start;
aspace->size = length;
aspace->private_object = RT_NULL;
err = _aspace_bst_init(aspace);
if (err == RT_EOK)
{
/**
* It has the side effect that lock will be added to object
* system management. So it must be paired with a detach once
* the initialization return successfully.
*/
err = _init_lock(aspace);
}
}
else
{
err = -RT_EINVAL;
}
return err;
}
rt_aspace_t rt_aspace_create(void *start, rt_size_t length, void *pgtbl)
{
rt_aspace_t aspace = NULL;
int err;
RT_ASSERT(length <= 0 - (rt_size_t)start);
aspace = (rt_aspace_t)rt_malloc(sizeof(*aspace));
if (aspace)
{
rt_memset(aspace, 0, sizeof(*aspace));
err = rt_aspace_init(aspace, start, length, pgtbl);
if (err != RT_EOK)
{
LOG_W("%s(%p, %lx, %p): failed with code %d\n", __func__,
start, length, pgtbl, err);
rt_free(aspace);
aspace = RT_NULL;
}
}
return aspace;
}
void rt_aspace_detach(rt_aspace_t aspace)
{
rt_varea_t varea;
WR_LOCK(aspace);
varea = ASPACE_VAREA_FIRST(aspace);
while (varea)
{
rt_varea_t prev = varea;
varea = ASPACE_VAREA_NEXT(varea);
_varea_uninstall_locked(prev);
if (VAREA_NOT_STATIC(prev))
{
rt_free(prev);
}
}
WR_UNLOCK(aspace);
rt_aspace_anon_ref_dec(aspace->private_object);
rt_mutex_detach(&aspace->bst_lock);
}
void rt_aspace_delete(rt_aspace_t aspace)
{
RT_ASSERT(aspace);
rt_aspace_detach(aspace);
rt_free(aspace);
}
rt_inline rt_size_t _get_effect_attr(rt_aspace_t aspace, rt_varea_t varea)
{
rt_size_t attr = varea->attr;
/* not write permission for user on private mapping */
if (rt_varea_is_private_locked(varea))
attr = rt_hw_mmu_attr_rm_perm(attr, RT_HW_MMU_PROT_USER | RT_HW_MMU_PROT_WRITE);
return attr;
}
static int _do_named_map(rt_aspace_t aspace, rt_varea_t varea, void *vaddr,
rt_size_t length, rt_size_t offset, rt_size_t attr)
{
LOG_D("%s: va %p length %p", __func__, vaddr, length);
int err = RT_EOK;
/* it's ensured by caller that (void*)end will not overflow */
void *phyaddr = (void *)(offset << MM_PAGE_SHIFT);
void *ret;
attr = _get_effect_attr(aspace, varea);
ret = rt_hw_mmu_map(aspace, vaddr, phyaddr, length, attr);
if (ret == RT_NULL)
{
err = -RT_ERROR;
}
if (err == RT_EOK)
rt_hw_tlb_invalidate_range(aspace, vaddr, length, ARCH_PAGE_SIZE);
return err;
}
rt_inline void _do_page_fault(struct rt_aspace_fault_msg *msg, rt_size_t off,
void *vaddr, rt_mem_obj_t mem_obj,
rt_varea_t varea)
{
msg->off = off;
msg->fault_vaddr = vaddr;
msg->fault_op = MM_FAULT_OP_READ;
msg->fault_type = MM_FAULT_TYPE_PAGE_FAULT;
msg->response.status = MM_FAULT_STATUS_UNRECOVERABLE;
msg->response.vaddr = 0;
msg->response.size = 0;
RT_ASSERT(mem_obj->on_page_fault);
mem_obj->on_page_fault(varea, msg);
}
int rt_varea_map_with_msg(rt_varea_t varea, struct rt_aspace_fault_msg *msg)
{
rt_aspace_t aspace;
int err = -RT_ERROR;
if (msg->response.status == MM_FAULT_STATUS_OK)
{
/**
* the page returned by handler is not checked
* cause no much assumption can make on it
*/
char *store = msg->response.vaddr;
rt_size_t store_sz = msg->response.size;
if ((char *)msg->fault_vaddr + store_sz > (char *)varea->start + varea->size)
{
LOG_W("%s: too much (0x%lx) of buffer on vaddr %p is provided",
__func__, store_sz, msg->fault_vaddr);
}
else
{
void *map;
rt_size_t attr;
void *v_addr = msg->fault_vaddr;
void *p_addr = store + PV_OFFSET;
aspace = varea->aspace;
RT_ASSERT(aspace);
attr = _get_effect_attr(aspace, varea);
map = rt_hw_mmu_map(aspace, v_addr, p_addr, store_sz, attr);
if (!map)
{
LOG_W("%s: MMU mapping failed for va %p to %p of %lx", __func__,
msg->fault_vaddr, store + PV_OFFSET, store_sz);
}
else
{
rt_hw_tlb_invalidate_range(varea->aspace, v_addr, store_sz, ARCH_PAGE_SIZE);
err = RT_EOK;
}
}
}
else if (msg->response.status == MM_FAULT_STATUS_OK_MAPPED)
{
if (rt_hw_mmu_v2p(varea->aspace, msg->fault_vaddr) == ARCH_MAP_FAILED)
{
LOG_D("%s: no page is mapped on %p", __func__, msg->fault_vaddr);
}
err = RT_EOK;
}
else
{
LOG_W("%s: failed on va %p inside varea %p(%s)", __func__, msg->fault_vaddr, varea,
varea->mem_obj->get_name ? varea->mem_obj->get_name(varea) : "unknow");
}
return err;
}
/* allocate memory page for mapping range */
static int _do_prefetch(rt_aspace_t aspace, rt_varea_t varea, void *start,
rt_size_t size)
{
int err = RT_EOK;
/* it's ensured by caller that start & size ara page-aligned */
char *end = (char *)start + size;
char *vaddr = start;
rt_size_t off = varea->offset + ((vaddr - (char *)varea->start) >> ARCH_PAGE_SHIFT);
while (vaddr != end)
{
/* TODO try to map with huge TLB, when flag & HUGEPAGE */
struct rt_aspace_fault_msg msg;
_do_page_fault(&msg, off, vaddr, varea->mem_obj, varea);
if (rt_varea_map_with_msg(varea, &msg))
{
err = -RT_ENOMEM;
break;
}
/**
* It's hard to identify the mapping pattern on a customized handler
* So we terminate the prefetch process on that case
*/
if (msg.response.status == MM_FAULT_STATUS_OK_MAPPED)
break;
vaddr += msg.response.size;
off += msg.response.size >> ARCH_PAGE_SHIFT;
}
return err;
}
static rt_err_t _expand_varea(rt_varea_t varea, void *new_va, rt_size_t size)
{
rt_err_t error;
rt_aspace_t aspace;
void *old_va;
if (varea->mem_obj && varea->mem_obj->on_varea_expand)
error = varea->mem_obj->on_varea_expand(varea, new_va, size);
else
error = -RT_EPERM;
if (error == RT_EOK)
{
aspace = varea->aspace;
old_va = varea->start;
varea->size = size;
if (old_va != new_va)
{
varea->start = new_va;
varea->offset += ((long)new_va - (long)old_va) >> MM_PAGE_SHIFT;
_aspace_bst_remove(aspace, varea);
_aspace_bst_insert(aspace, varea);
}
}
return error;
}
struct _mapping_property {
rt_size_t attr;
rt_size_t flags;
rt_size_t offset;
struct rt_mem_obj *mem_obj;
};
#define INIT_PROP(obj,off,fl,attr) \
{.mem_obj = (obj), \
.offset = (off), \
.flags = (fl), \
.attr = (attr),}
static rt_bool_t _contiguous_offset(rt_varea_t neighbour, rt_size_t map_size,
struct _mapping_property *prop)
{
rt_size_t n_off = neighbour->offset;
rt_size_t map_off = prop->offset;
return n_off < map_off ?
n_off + (neighbour->size >> MM_PAGE_SHIFT) == map_off :
map_off + (map_size >> MM_PAGE_SHIFT) == n_off;
}
static rt_bool_t _compatible(rt_varea_t neighbour, rt_size_t map_size,
struct _mapping_property *prop)
{
return (prop->attr == neighbour->attr && prop->flags == neighbour->flag &&
prop->mem_obj == neighbour->mem_obj &&
_contiguous_offset(neighbour, map_size, prop));
}
rt_inline rt_err_t _migrate_and_release_varea(rt_aspace_t aspace, rt_varea_t to, rt_varea_t from,
rt_err_t (*on_varea_merge)(struct rt_varea *to, struct rt_varea *from))
{
rt_err_t error;
error = on_varea_merge(to, from);
if (error == RT_EOK)
{
/* uninstall operand & release the varea */
_aspace_bst_remove(aspace, from);
to->size += from->size;
if (VAREA_NOT_STATIC(from))
rt_free(from);
}
return error;
}
static rt_varea_t _merge_surrounding(rt_aspace_t aspace, rt_varea_t operand,
struct _mapping_property *prop)
{
int again;
rt_err_t error;
int can_merge_fw;
int can_merge_bw;
rt_varea_t neighbour;
char *operand_start;
size_t operand_size;
rt_err_t (*on_varea_merge)(struct rt_varea *to, struct rt_varea *from);
if (operand->mem_obj && operand->mem_obj->on_varea_merge)
{
on_varea_merge = operand->mem_obj->on_varea_merge;
do {
operand_start = operand->start;
operand_size = operand->size;
LOG_D("search op_start=%p,op_size=0x%lx", operand_start, operand_size);
/* find a compatible neighbour if any and setup direction */
can_merge_fw = can_merge_bw = 0;
neighbour = _aspace_bst_search(aspace, operand_start - 1);
if (!neighbour || !_compatible(neighbour, operand_size, prop))
{
neighbour = _aspace_bst_search(aspace, operand_start + operand_size);
if (neighbour && _compatible(neighbour, operand_size, prop))
can_merge_bw = 1;
}
else
can_merge_fw = 1;
if (can_merge_fw || can_merge_bw)
{
/* merge operand with its predecessor or successor */
if (can_merge_fw)
{
error = _migrate_and_release_varea(aspace, neighbour, operand, on_varea_merge);
operand = neighbour;
}
else
error = _migrate_and_release_varea(aspace, operand, neighbour, on_varea_merge);
if (error == RT_EOK)
again = 1;
}
else
again = 0;
} while (again);
}
return operand;
}
/**
* Brief: expand and merge surrounding until not possible and
* setup the pvarea if new virt address region is installed
*/
static rt_bool_t _try_expand_and_merge_okay(rt_aspace_t aspace, rt_varea_t *pvarea,
void *alloc_va, rt_mm_va_hint_t hint,
struct _mapping_property *prop)
{
int can_expand_fw;
int can_expand_bw;
rt_varea_t neighbour;
rt_varea_t new_region_at = RT_NULL;
rt_bool_t install_ok = RT_FALSE;
char *operand_start = alloc_va;
size_t operand_size = hint->map_size;
/* find a compatible neighbour if any and setup direction */
LOG_D("search op_start=%p,op_size=0x%lx", operand_start, operand_size);
can_expand_fw = can_expand_bw = 0;
neighbour = _aspace_bst_search(aspace, operand_start - 1);
if (!neighbour || !_compatible(neighbour, operand_size, prop))
{
neighbour = _aspace_bst_search(aspace, operand_start + operand_size);
if (neighbour && _compatible(neighbour, operand_size, prop))
can_expand_bw = 1;
}
else
can_expand_fw = 1;
if (can_expand_fw || can_expand_bw)
{
/* expand varea at head or tailing */
if (can_expand_fw)
operand_start = neighbour->start;
operand_size += neighbour->size;
LOG_D("expand op_start=%p,op_size=0x%lx", operand_start, operand_size);
if (_expand_varea(neighbour, operand_start, operand_size) == RT_EOK)
{
new_region_at = _merge_surrounding(aspace, neighbour, prop);
*pvarea = new_region_at;
install_ok = RT_TRUE;
}
}
return install_ok;
}
static rt_varea_t _varea_create(void *start, rt_size_t size);
static int _insert_new_varea(rt_aspace_t aspace, rt_varea_t *pvarea,
void *alloc_va, rt_mm_va_hint_t hint)
{
int err;
rt_varea_t varea = *pvarea;
if (varea == RT_NULL)
{
/* no preallocate buffer is provided, then create one */
varea = _varea_create(hint->prefer, hint->map_size);
hint->flags &= ~MMF_STATIC_ALLOC;
*pvarea = varea;
}
if (varea)
{
varea->start = alloc_va;
_aspace_bst_insert(aspace, varea);
err = RT_EOK;
}
else
{
LOG_W("%s: Out of memory", __func__);
err = -RT_ENOMEM;
}
return err;
}
static inline void _varea_post_install(rt_varea_t varea, rt_aspace_t aspace,
rt_size_t attr, rt_size_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
varea->aspace = aspace;
varea->attr = attr;
varea->mem_obj = mem_obj;
varea->flag = flags;
varea->offset = offset;
if (varea->mem_obj && varea->mem_obj->on_varea_open)
varea->mem_obj->on_varea_open(varea);
}
/**
* Install new virtual address region into address space
* The pvarea will be set to the varea where new virt memory installed which can
* be a newly created or existed one.
*
* Note: caller must hold the aspace lock
*/
static int _varea_install(rt_aspace_t aspace, rt_varea_t *pvarea,
rt_mm_va_hint_t hint, struct _mapping_property *prop,
void **pva)
{
void *alloc_va;
int err = RT_EOK;
if (hint->flags & MMF_MAP_FIXED)
{
alloc_va = hint->prefer;
err = _unmap_range_locked(aspace, alloc_va, hint->map_size);
if (err != RT_EOK)
{
/* Note: MAP_FIXED must failed if unable to unmap existing mapping */
LOG_I("%s: unmap range failed in %p with size 0x%lx, error=%d", __func__, alloc_va, hint->map_size, err);
}
}
else
{
alloc_va =
_find_free(aspace, hint->prefer, hint->map_size, hint->limit_start,
hint->limit_range_size, hint->flags);
if (alloc_va == RT_NULL)
err = -RT_ENOSPC;
}
if (alloc_va != RT_NULL)
{
/* TODO: fix to private mapping directly */
if (!_try_expand_and_merge_okay(aspace, pvarea, alloc_va, hint, prop))
{
err = _insert_new_varea(aspace, pvarea, alloc_va, hint);
if (err == RT_EOK)
_varea_post_install(*pvarea, aspace, prop->attr, prop->flags,
prop->mem_obj, prop->offset);
}
if (err == RT_EOK)
{
RT_ASSERT(*pvarea);
*pva = alloc_va;
}
}
return err;
}
/**
* restore context modified by varea install
*/
void _varea_uninstall_locked(rt_varea_t varea)
{
rt_aspace_t aspace = varea->aspace;
if (varea->mem_obj && varea->mem_obj->on_varea_close)
varea->mem_obj->on_varea_close(varea);
else
{
rt_hw_mmu_unmap(aspace, varea->start, varea->size);
rt_hw_tlb_invalidate_range(aspace, varea->start, varea->size, ARCH_PAGE_SIZE);
}
_aspace_bst_remove(aspace, varea);
}
int _mm_aspace_map(rt_aspace_t aspace, rt_varea_t *pvarea, void **addr,
rt_size_t length, rt_size_t attr, mm_flag_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
int err = RT_EOK;
rt_varea_t varea;
struct _mapping_property prop = INIT_PROP(mem_obj, offset, flags, attr);
WR_LOCK(aspace);
/**
* @brief .prefer & .map_size are scratched from varea which setup by caller
* .limit_start & .limit_range_size have default to be in range of aspace
* .flags is from parameter, and will be fill in varea if install successfully
*/
struct rt_mm_va_hint hint = {.prefer = *addr,
.map_size = length,
.limit_start = aspace->start,
.limit_range_size = aspace->size,
.flags = flags};
if (mem_obj->hint_free)
{
/* mem object can control mapping range and so by modifing hint */
mem_obj->hint_free(&hint);
}
/* try to allocate a virtual address region for varea */
err = _varea_install(aspace, pvarea, &hint, &prop, addr);
if (err == RT_EOK)
{
varea = *pvarea;
if (MMF_TEST_CNTL(flags, MMF_PREFETCH))
{
/* do the MMU & TLB business */
err = _do_prefetch(aspace, varea, varea->start, varea->size);
if (err)
{
LOG_I("%s: failed to prefetch page into varea(%s)",
__func__, VAREA_NAME(varea));
/* restore data structure and MMU */
_varea_uninstall_locked(varea);
if (!(varea->flag & MMF_STATIC_ALLOC))
rt_free(varea);
}
}
}
WR_UNLOCK(aspace);
return err;
}
static rt_varea_t _varea_create(void *start, rt_size_t size)
{
rt_varea_t varea;
varea = (rt_varea_t)rt_malloc(sizeof(struct rt_varea));
if (varea)
{
varea->start = start;
varea->size = size;
}
return varea;
}
#define _IS_OVERFLOW(start, length) ((length) > (0ul - (uintptr_t)(start)))
#define _IS_OVERSIZE(start, length, limit_s, limit_sz) (((length) + (rt_size_t)((char *)(start) - (char *)(limit_start))) > (limit_size))
static inline int _not_in_range(void *start, rt_size_t length,
void *limit_start, rt_size_t limit_size)
{
/* assuming (base + length) will not overflow except (0) */
int rc = start != RT_NULL
? (_IS_OVERFLOW(start, length) || start < limit_start ||
_IS_OVERSIZE(start, length, limit_start, limit_size))
: length > limit_size;
if (rc)
LOG_D("%s: [%p : %p] [%p : %p]", __func__, start, length, limit_start, limit_size);
return rc;
}
static inline int _not_align(void *start, rt_size_t length, rt_size_t mask)
{
return (start != RT_NULL) &&
(((uintptr_t)start & mask) || (length & mask));
}
/** if the flag is currently supported */
static inline int _not_support(rt_size_t flags)
{
rt_size_t support_ops = MMF_CREATE(((__MMF_INVALID - 1) << 1) - 1, 1);
return flags & ~(support_ops);
}
int rt_aspace_map(rt_aspace_t aspace, void **addr, rt_size_t length,
rt_size_t attr, mm_flag_t flags, rt_mem_obj_t mem_obj,
rt_size_t offset)
{
int err;
rt_varea_t varea = RT_NULL;
RT_DEBUG_SCHEDULER_AVAILABLE(1);
if (!aspace || !addr || !mem_obj || length == 0)
{
err = -RT_EINVAL;
LOG_I("%s(%p, %p, %lx, %lx, %lx, %p, %lx): Invalid input",
__func__, aspace, addr, length, attr, flags, mem_obj, offset);
}
else if (_not_in_range(*addr, length, aspace->start, aspace->size))
{
err = -RT_EINVAL;
LOG_I("%s(addr:%p, len:%lx): out of range", __func__, *addr, length);
}
else if (_not_support(flags))
{
LOG_I("%s: no support flags 0x%lx", __func__, flags);
err = -RT_ENOSYS;
}
else
{
RT_ASSERT((length & ARCH_PAGE_MASK) == 0);
RT_ASSERT(((long)*addr & ARCH_PAGE_MASK) == 0);
err = _mm_aspace_map(aspace, &varea, addr, length, attr, flags, mem_obj, offset);
}
if (err != RT_EOK)
{
*addr = NULL;
}
return err;
}
int rt_aspace_map_static(rt_aspace_t aspace, rt_varea_t varea, void **addr,
rt_size_t length, rt_size_t attr, mm_flag_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
int err;
if (!aspace || !varea || !addr || !mem_obj || length == 0 ||
_not_in_range(*addr, length, aspace->start, aspace->size))
{
err = -RT_EINVAL;
LOG_W("%s: Invalid input", __func__);
}
else if (_not_support(flags))
{
LOG_W("%s: no support flags", __func__);
err = -RT_ENOSYS;
}
else
{
varea->size = length;
varea->start = *addr;
flags |= MMF_STATIC_ALLOC;
/**
* todo: fix if mapping expand, the static varea is not used at all
*/
err = _mm_aspace_map(aspace, &varea, addr, length, attr, flags, mem_obj, offset);
}
if (err != RT_EOK)
{
*addr = NULL;
}
else
{
*addr = varea->start;
}
return err;
}
int _mm_aspace_map_phy(rt_aspace_t aspace, rt_varea_t varea,
rt_mm_va_hint_t hint, rt_size_t attr, rt_size_t pa_off,
void **ret_va)
{
int err;
void *vaddr;
if (!aspace || !hint || !hint->limit_range_size || !hint->map_size)
{
LOG_W("%s: Invalid input", __func__);
err = -RT_EINVAL;
}
else if (_not_align(hint->prefer, hint->map_size, ARCH_PAGE_MASK))
{
LOG_W("%s: not aligned", __func__);
err = -RT_EINVAL;
}
else if (_not_in_range(hint->limit_start, hint->limit_range_size, aspace->start,
aspace->size) ||
_not_in_range(hint->prefer, hint->map_size, aspace->start,
aspace->size))
{
LOG_W("%s: not in range", __func__);
err = -RT_EINVAL;
}
else
{
struct _mapping_property prop = INIT_PROP(0, pa_off, hint->flags, attr);
WR_LOCK(aspace);
err = _varea_install(aspace, &varea, hint, &prop, &vaddr);
if (err == RT_EOK)
{
err = _do_named_map(aspace, varea, varea->start, varea->size,
(rt_size_t)pa_off, attr);
if (err != RT_EOK)
{
_varea_uninstall_locked(varea);
}
}
WR_UNLOCK(aspace);
}
if (ret_va)
{
if (err == RT_EOK)
*ret_va = vaddr;
else
*ret_va = RT_NULL;
}
return err;
}
int rt_aspace_map_phy(rt_aspace_t aspace, rt_mm_va_hint_t hint, rt_size_t attr,
rt_size_t pa_off, void **ret_va)
{
int err;
if (hint)
{
rt_varea_t varea = _varea_create(hint->prefer, hint->map_size);
if (varea)
{
hint->flags &= ~MMF_STATIC_ALLOC;
err = _mm_aspace_map_phy(aspace, varea, hint, attr, pa_off, ret_va);
if (err != RT_EOK)
{
rt_free(varea);
}
}
else
{
err = -RT_ENOMEM;
}
}
else
{
err = -RT_EINVAL;
}
return err;
}
int rt_aspace_map_phy_static(rt_aspace_t aspace, rt_varea_t varea,
rt_mm_va_hint_t hint, rt_size_t attr,
rt_size_t pa_off, void **ret_va)
{
int err;
if (varea && hint)
{
varea->start = hint->prefer;
varea->size = hint->map_size;
hint->flags |= (MMF_STATIC_ALLOC);
LOG_D("%s: start %p size %p phy at %p", __func__, varea->start, varea->size, pa_off << MM_PAGE_SHIFT);
err = _mm_aspace_map_phy(aspace, varea, hint, attr, pa_off, ret_va);
}
else
{
err = -RT_EINVAL;
}
return err;
}
int _aspace_unmap(rt_aspace_t aspace, void *addr)
{
int error;
rt_varea_t varea;
WR_LOCK(aspace);
varea = _aspace_bst_search(aspace, addr);
if (varea == RT_NULL)
{
LOG_D("%s: No such entry found at %p\n", __func__, addr);
error = -RT_ENOENT;
}
else
{
_varea_uninstall_locked(varea);
if (!(varea->flag & MMF_STATIC_ALLOC))
{
rt_free(varea);
}
error = RT_EOK;
}
WR_UNLOCK(aspace);
return error;
}
int rt_aspace_unmap(rt_aspace_t aspace, void *addr)
{
int error;
if (!aspace)
{
LOG_I("%s: Invalid input", __func__);
error = -RT_EINVAL;
}
else if (_not_in_range(addr, 1, aspace->start, aspace->size))
{
LOG_I("%s: %lx not in range of aspace[%lx:%lx]", __func__, addr,
aspace->start, (char *)aspace->start + aspace->size);
error = -RT_EINVAL;
}
else
{
error = _aspace_unmap(aspace, addr);
}
return error;
}
/**
* modify the property of existed varea by shrink its size. Mem_obj is
* notified to released the resource.
*/
static rt_err_t _shrink_varea(rt_varea_t varea, void *new_va, rt_size_t size)
{
rt_err_t error;
rt_aspace_t aspace;
void *old_va;
if (varea->mem_obj && varea->mem_obj->on_varea_shrink)
error = varea->mem_obj->on_varea_shrink(varea, new_va, size);
else
error = -RT_EPERM;
if (error == RT_EOK)
{
aspace = varea->aspace;
old_va = varea->start;
varea->size = size;
if (old_va != new_va)
{
varea->start = new_va;
varea->offset += ((long)new_va - (long)old_va) >> MM_PAGE_SHIFT;
_aspace_bst_remove(aspace, varea);
_aspace_bst_insert(aspace, varea);
}
}
return error;
}
static rt_err_t _split_varea(rt_varea_t existed, char *ex_end, char *unmap_start, char *unmap_end, rt_size_t unmap_len)
{
int error;
size_t rela_offset;
rt_varea_t subset;
char *subset_start;
size_t subset_size;
if (existed->mem_obj && existed->mem_obj->on_varea_split)
{
subset_start = unmap_end;
subset_size = ex_end - subset_start;
subset = _varea_create(subset_start, subset_size);
if (subset)
{
rela_offset = MM_PA_TO_OFF(subset_start - (char *)existed->start);
subset->aspace = existed->aspace;
subset->attr = existed->attr;
subset->mem_obj = existed->mem_obj;
subset->flag = existed->flag & ~MMF_STATIC_ALLOC;
subset->offset = existed->offset + rela_offset;
error = existed->mem_obj->on_varea_split(existed, unmap_start, unmap_len, subset);
if (error == RT_EOK)
{
existed->size = unmap_start - (char *)existed->start;
_aspace_bst_insert(existed->aspace, subset);
}
if (error != RT_EOK)
rt_free(subset);
}
else
error = -RT_ENOMEM;
}
else
error = -RT_EPERM;
return error;
}
/* remove overlapped pages from varea */
static int _remove_overlapped_varea(rt_varea_t existed, char *unmap_start, rt_size_t unmap_len)
{
int error;
char *ex_start = existed->start;
char *ex_end = ex_start + existed->size;
char *unmap_end = unmap_start + unmap_len;
if (ex_start < unmap_start)
{
if (ex_end > unmap_end)
error = _split_varea(existed, ex_end, unmap_start, unmap_end, unmap_len);
else
error = _shrink_varea(existed, ex_start, unmap_start - ex_start);
}
else if (ex_end > unmap_end)
error = _shrink_varea(existed, unmap_end, ex_end - unmap_end);
else
{