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rt-thread/components/mm/mm_page.c

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-11-01 Jesven The first version
* 2022-12-13 WangXiaoyao Hot-pluggable, extensible
* page management algorithm
* 2023-02-20 WangXiaoyao Multi-list page-management
* 2023-11-28 Shell Bugs fix for page_install on shadow region
* 2024-06-18 Shell Added affinity page management for page coloring.
*/
#include <rtthread.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "mm_fault.h"
#include "mm_private.h"
#include "mm_aspace.h"
#include "mm_flag.h"
#include "mm_page.h"
#include <mmu.h>
#define DBG_TAG "mm.page"
#define DBG_LVL DBG_WARNING
#include <rtdbg.h>
RT_STATIC_ASSERT(order_huge_pg, RT_PAGE_MAX_ORDER > ARCH_PAGE_SHIFT - 2);
RT_STATIC_ASSERT(size_width, sizeof(rt_size_t) == sizeof(void *));
#ifdef RT_USING_SMART
#include "lwp_arch_comm.h"
#endif /* RT_USING_SMART */
static rt_size_t init_mpr_align_start;
static rt_size_t init_mpr_align_end;
static void *init_mpr_cont_start;
static struct rt_varea mpr_varea;
typedef union
{
struct rt_page *page_list;
rt_ubase_t aff_page_map;
} pgls_agr_t;
#define PGLS_IS_AFF_MAP(pgls) (!!((pgls).aff_page_map & 0x1))
#define PGLS_FROM_AFF_MAP(pgls, aff_map) \
((pgls).aff_page_map = (-(rt_ubase_t)(aff_map)) | 0x1)
#define PGLS_GET_AFF_MAP(pgls) \
((struct rt_page **)-((pgls).aff_page_map & ~0x1))
#define PGLS_GET(pgls) \
(PGLS_IS_AFF_MAP(pgls) ? PGLS_GET_AFF_MAP(pgls) : (pgls).page_list)
#define PAGE_TO_AFFID(page) (RT_PAGE_PICK_AFFID(page_to_paddr(page)))
/* affinity id */
#define AFFID_BLK_BITS \
((sizeof(int) * 8 - 1) - __builtin_clz(RT_PAGE_AFFINITY_BLOCK_SIZE) - ARCH_PAGE_SHIFT)
#define AFFID_NUMOF_ID_IN_SET(order) \
((RT_PAGE_AFFINITY_BLOCK_SIZE / ARCH_PAGE_SIZE) / (1ul << (order)))
#define AFFID_BITS_MASK(order) \
(((1 << AFFID_BLK_BITS) - 1) - ((1 << (order)) - 1))
static pgls_agr_t page_list_low[RT_PAGE_MAX_ORDER];
static rt_page_t
aff_pglist_low[AFFID_NUMOF_ID_IN_SET(0) * 2 - 2];
static pgls_agr_t page_list_high[RT_PAGE_MAX_ORDER];
static rt_page_t
aff_pglist_high[AFFID_NUMOF_ID_IN_SET(0) * 2 - 2];
/* protect buddy list and page records */
static RT_DEFINE_SPINLOCK(_pgmgr_lock);
#define page_start ((rt_page_t)rt_mpr_start)
static rt_size_t _page_nr, _page_nr_hi;
static rt_size_t _freed_nr, _freed_nr_hi;
static rt_size_t early_offset;
static const char *get_name(rt_varea_t varea)
{
return "master-page-record";
}
static void hint_free(rt_mm_va_hint_t hint)
{
hint->flags = MMF_MAP_FIXED;
hint->limit_start = rt_kernel_space.start;
hint->limit_range_size = rt_kernel_space.size;
hint->prefer = rt_mpr_start;
}
static void on_page_fault(struct rt_varea *varea,
struct rt_aspace_fault_msg *msg)
{
char *init_start = (void *)init_mpr_align_start;
char *init_end = (void *)init_mpr_align_end;
if ((char *)msg->fault_vaddr < init_end &&
(char *)msg->fault_vaddr >= init_start)
{
rt_size_t offset = (char *)msg->fault_vaddr - init_start;
msg->response.status = MM_FAULT_STATUS_OK;
msg->response.vaddr = (char *)init_mpr_cont_start + offset;
msg->response.size = ARCH_PAGE_SIZE;
}
else
{
rt_mm_dummy_mapper.on_page_fault(varea, msg);
}
}
static struct rt_mem_obj mm_page_mapper = {
.get_name = get_name,
.on_page_fault = on_page_fault,
.hint_free = hint_free,
};
#ifdef RT_DEBUGGING_PAGE_LEAK
static volatile int enable;
static rt_page_t _trace_head;
#define TRACE_ALLOC(pg, size) _trace_alloc(pg, __builtin_return_address(0), size)
#define TRACE_FREE(pgaddr, size) _trace_free(pgaddr, __builtin_return_address(0), size)
static long _alloc_cnt;
void rt_page_leak_trace_start()
{
// TODO multicore safety
_trace_head = NULL;
_alloc_cnt = 0;
enable = 1;
}
MSH_CMD_EXPORT(rt_page_leak_trace_start, start page leak tracer);
static void _collect()
{
rt_page_t page = _trace_head;
if (!page)
{
rt_kprintf("ok! ALLOC CNT %ld\n", _alloc_cnt);
}
else
{
while (page)
{
rt_page_t next = page->tl_next;
void *pg_va = rt_page_page2addr(page);
LOG_W("LEAK: %p, allocator: %p, size bits: %lx", pg_va, page->caller, page->trace_size);
rt_pages_free(pg_va, page->trace_size);
page = next;
}
}
}
void rt_page_leak_trace_stop()
{
// TODO multicore safety
enable = 0;
_collect();
}
MSH_CMD_EXPORT(rt_page_leak_trace_stop, stop page leak tracer);
static void _trace_alloc(rt_page_t page, void *caller, size_t size_bits)
{
if (enable)
{
page->caller = caller;
page->trace_size = size_bits;
page->tl_prev = NULL;
page->tl_next = NULL;
_alloc_cnt++;
if (_trace_head == NULL)
{
_trace_head = page;
}
else
{
_trace_head->tl_prev = page;
page->tl_next = _trace_head;
_trace_head = page;
}
}
}
void _report(rt_page_t page, size_t size_bits, char *msg)
{
void *pg_va = rt_page_page2addr(page);
LOG_W("%s: %p, allocator: %p, size bits: %lx", msg, pg_va, page->caller, page->trace_size);
rt_kprintf("backtrace\n");
rt_backtrace();
}
static void _trace_free(rt_page_t page, void *caller, size_t size_bits)
{
if (enable)
{
/* free after free */
if (page->trace_size == 0xabadcafe)
{
_report(page, size_bits, "free after free");
return ;
}
else if (page->trace_size != size_bits)
{
rt_kprintf("free with size bits %lx\n", size_bits);
_report(page, size_bits, "incompatible size bits parameter");
return ;
}
if (page->ref_cnt == 0)
{
_alloc_cnt--;
if (page->tl_prev)
page->tl_prev->tl_next = page->tl_next;
if (page->tl_next)
page->tl_next->tl_prev = page->tl_prev;
if (page == _trace_head)
_trace_head = page->tl_next;
page->tl_prev = NULL;
page->tl_next = NULL;
page->trace_size = 0xabadcafe;
}
}
}
#else
#define TRACE_ALLOC(x, y)
#define TRACE_FREE(x, y)
#endif
/* page management */
#ifdef RT_DEBUGGING_PAGE_POISON
#include <bitmap.h>
RT_BITMAP_DECLARE(_init_region_usage_trace, (1 << (1 + ARCH_SECTION_SHIFT - ARCH_PAGE_SHIFT)));
#else
typedef char rt_bitmap_t[0];
#define RT_BITMAP_LEN(__name) (__name)
#endif /* RT_DEBUGGING_PAGE_POISON */
static struct installed_page_reg
{
rt_region_t region_area;
struct installed_page_reg *next;
struct rt_spinlock lock;
#ifdef RT_DEBUGGING_PAGE_POISON
rt_bitmap_t *usage_trace;
#endif /* RT_DEBUGGING_PAGE_POISON */
} _init_region;
static RT_DEFINE_SPINLOCK(_inst_page_reg_lock);
static struct installed_page_reg *_inst_page_reg_head;
static void _print_region_list(void)
{
struct installed_page_reg *iter;
int counts = 0;
rt_spin_lock(&_inst_page_reg_lock);
iter = _inst_page_reg_head;
while (iter != RT_NULL)
{
rt_kprintf(" %d: [%p, %p]\n", counts++, iter->region_area.start + PV_OFFSET,
iter->region_area.end + PV_OFFSET);
iter = iter->next;
}
rt_spin_unlock(&_inst_page_reg_lock);
}
static struct installed_page_reg *_find_page_region(rt_ubase_t page_va)
{
struct installed_page_reg *iter;
struct installed_page_reg *rc = RT_NULL;
rt_bool_t found = RT_FALSE;
rt_spin_lock(&_inst_page_reg_lock);
for (iter = _inst_page_reg_head; iter; iter = iter->next)
{
if (page_va >= iter->region_area.start &&
page_va < iter->region_area.end)
{
found = RT_TRUE;
break;
}
}
rt_spin_unlock(&_inst_page_reg_lock);
if (found)
{
rc = iter;
}
return rc;
}
rt_bool_t rt_page_is_member(rt_base_t page_pa)
{
return _find_page_region(page_pa - PV_OFFSET) != RT_NULL;
}
static rt_bool_t _pages_are_member(rt_ubase_t page_va, size_t size_bits)
{
rt_bool_t rc = RT_TRUE;
rt_ubase_t iter_frame = page_va;
size_t frame_end = page_va + (1 << size_bits);
while (iter_frame < frame_end)
{
size_t overlap_size;
struct installed_page_reg *page_reg = _find_page_region(iter_frame);
if (!page_reg)
{
rc = RT_FALSE;
LOG_E("Allocated invalid page %p", iter_frame);
break;
}
overlap_size = page_reg->region_area.end - iter_frame;
iter_frame += overlap_size;
}
return rc;
}
#ifdef RT_DEBUGGING_PAGE_POISON
static rt_err_t _unpoisoned_pages(char *head, rt_uint32_t size_bits)
{
rt_err_t error = RT_EOK;
struct installed_page_reg *page_reg = _find_page_region((rt_ubase_t)head);
if (page_reg)
{
int pages_count = 1 << size_bits;
long bit_number = ((rt_ubase_t)head - page_reg->region_area.start) / ARCH_PAGE_SIZE;
/* mark the pages as allocated */
for (size_t i = 0; i < pages_count; i++, bit_number++)
{
rt_spin_lock(&_inst_page_reg_lock);
if (rt_bitmap_test_bit(page_reg->usage_trace, bit_number))
{
error = RT_ERROR;
rt_kprintf("%s: Pages[%p, %d] is already in used by others!\n", __func__, head, size_bits);
}
rt_bitmap_set_bit(page_reg->usage_trace, bit_number);
rt_spin_unlock(&_inst_page_reg_lock);
}
}
else
{
error = RT_EINVAL;
}
return -error;
}
static rt_err_t _poisoned_pages(char *head, rt_uint32_t size_bits)
{
rt_err_t error = RT_EOK;
struct installed_page_reg *page_reg = _find_page_region((rt_ubase_t)head);
if (page_reg)
{
int pages_count = 1 << size_bits;
long bit_number = ((rt_ubase_t)head - page_reg->region_area.start) / ARCH_PAGE_SIZE;
/* mark the pages as free */
for (size_t i = 0; i < pages_count; i++, bit_number++)
{
rt_spin_lock(&_inst_page_reg_lock);
if (!rt_bitmap_test_bit(page_reg->usage_trace, bit_number))
{
error = RT_ERROR;
rt_kprintf("%s: Pages[%p, %d] is freed before!\n", __func__, head, size_bits);
}
rt_bitmap_clear_bit(page_reg->usage_trace, bit_number);
rt_spin_unlock(&_inst_page_reg_lock);
}
}
else
{
error = RT_EINVAL;
}
return -error;
}
#endif /* RT_DEBUGGING_PAGE_POISON */
static inline void *page_to_addr(rt_page_t page)
{
return (void *)(((page - page_start) << ARCH_PAGE_SHIFT) - PV_OFFSET);
}
static inline rt_ubase_t page_to_paddr(rt_page_t page)
{
return (rt_ubase_t)((page - page_start) << ARCH_PAGE_SHIFT);
}
static inline rt_page_t addr_to_page(rt_page_t pg_start, void *addr)
{
addr = (char *)addr + PV_OFFSET;
return &pg_start[((rt_ubase_t)addr >> ARCH_PAGE_SHIFT)];
}
#define CEIL(val, align) (((rt_size_t)(val) + (align)-1) & ~((align)-1))
/**
* shadow is the accessible region by buddy but not usable for page manager.
* shadow mask is used for calculate the region head from an address.
*/
const rt_size_t shadow_mask =
((1ul << (RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1)) - 1);
const rt_size_t rt_mpr_size = CEIL(
((1ul << (ARCH_VADDR_WIDTH - ARCH_PAGE_SHIFT))) * sizeof(struct rt_page),
ARCH_PAGE_SIZE);
void *rt_mpr_start;
rt_weak int rt_hw_clz(unsigned long n)
{
return __builtin_clzl(n);
}
rt_weak int rt_hw_ctz(unsigned long n)
{
return __builtin_ctzl(n);
}
rt_size_t rt_page_bits(rt_size_t size)
{
int bit = sizeof(rt_size_t) * 8 - rt_hw_clz(size) - 1;
if ((size ^ (1UL << bit)) != 0)
{
bit++;
}
bit -= ARCH_PAGE_SHIFT;
if (bit < 0)
{
bit = 0;
}
return bit;
}
struct rt_page *rt_page_addr2page(void *addr)
{
return addr_to_page(page_start, addr);
}
void *rt_page_page2addr(struct rt_page *p)
{
return page_to_addr(p);
}
static inline struct rt_page *_buddy_get(struct rt_page *p,
rt_uint32_t size_bits)
{
rt_size_t addr;
RT_ASSERT(size_bits < RT_PAGE_MAX_ORDER - 1);
addr = (rt_size_t)rt_page_page2addr(p);
addr ^= (1UL << (size_bits + ARCH_PAGE_SHIFT));
return rt_page_addr2page((void *)addr);
}
static rt_page_t *_get_pgls_head_by_page(pgls_agr_t *agr_pgls, rt_page_t page,
rt_uint32_t size_bits)
{
rt_page_t *pgls_head;
int index;
if (size_bits < AFFID_BLK_BITS)
{
index = PAGE_TO_AFFID(page) >> size_bits;
RT_ASSERT(index < AFFID_NUMOF_ID_IN_SET(size_bits));
RT_ASSERT(PGLS_IS_AFF_MAP(agr_pgls[size_bits]));
pgls_head = &PGLS_GET_AFF_MAP(agr_pgls[size_bits])[index];
}
else
{
RT_ASSERT(!PGLS_IS_AFF_MAP(agr_pgls[size_bits]));
pgls_head = &agr_pgls[size_bits].page_list;
}
return pgls_head;
}
static rt_page_t *_get_pgls_head(pgls_agr_t *agr_pgls, int affid,
rt_uint32_t size_bits)
{
rt_page_t *pgls_head;
int index;
if (size_bits < AFFID_BLK_BITS)
{
index = affid >> size_bits;
RT_ASSERT(index < AFFID_NUMOF_ID_IN_SET(size_bits));
RT_ASSERT(PGLS_IS_AFF_MAP(agr_pgls[size_bits]));
pgls_head = &PGLS_GET_AFF_MAP(agr_pgls[size_bits])[index];
}
else
{
RT_ASSERT(!PGLS_IS_AFF_MAP(agr_pgls[size_bits]));
pgls_head = &agr_pgls[size_bits].page_list;
}
return pgls_head;
}
static void _page_alloc(struct rt_page *p)
{
p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
p->ref_cnt = 1;
}
static void _page_remove(rt_page_t *page_head, struct rt_page *p,
rt_uint32_t size_bits)
{
if (p->pre)
{
p->pre->next = p->next;
}
else
{
*page_head = p->next;
}
if (p->next)
{
p->next->pre = p->pre;
}
RT_ASSERT(p->size_bits == size_bits);
_page_alloc(p);
}
static void _page_insert(rt_page_t *page_head, struct rt_page *p,
rt_uint32_t size_bits)
{
p->next = *page_head;
if (p->next)
{
p->next->pre = p;
}
p->pre = 0;
*page_head = p;
p->size_bits = size_bits;
}
static void _pages_ref_inc(struct rt_page *p, rt_uint32_t size_bits)
{
struct rt_page *page_head;
int idx;
/* find page group head */
idx = p - page_start;
idx = idx & ~((1UL << size_bits) - 1);
page_head = page_start + idx;
page_head = (void *)((char *)page_head + early_offset);
page_head->ref_cnt++;
}
static int _pages_ref_get(struct rt_page *p, rt_uint32_t size_bits)
{
struct rt_page *page_head;
int idx;
/* find page group head */
idx = p - page_start;
idx = idx & ~((1UL << size_bits) - 1);
page_head = page_start + idx;
return page_head->ref_cnt;
}
static int _pages_free(pgls_agr_t page_list[], struct rt_page *p,
char *frame_va, rt_uint32_t size_bits)
{
rt_uint32_t level = size_bits;
struct rt_page *buddy;
RT_ASSERT(p >= page_start);
RT_ASSERT((char *)p < (char *)rt_mpr_start + rt_mpr_size);
RT_ASSERT(rt_kmem_v2p(p));
RT_ASSERT(p->ref_cnt > 0);
RT_ASSERT(p->size_bits == ARCH_ADDRESS_WIDTH_BITS);
RT_ASSERT(size_bits < RT_PAGE_MAX_ORDER);
RT_UNUSED(_pages_are_member);
RT_ASSERT(_pages_are_member((rt_ubase_t)frame_va, size_bits));
p->ref_cnt--;
if (p->ref_cnt != 0)
{
return 0;
}
#ifdef RT_DEBUGGING_PAGE_POISON
_poisoned_pages(frame_va, size_bits);
#endif /* RT_DEBUGGING_PAGE_POISON */
while (level < RT_PAGE_MAX_ORDER - 1)
{
buddy = _buddy_get(p, level);
if (buddy && buddy->size_bits == level)
{
_page_remove(_get_pgls_head_by_page(page_list, buddy, level),
buddy, level);
p = (p < buddy) ? p : buddy;
level++;
}
else
{
break;
}
}
_page_insert(_get_pgls_head_by_page(page_list, p, level),
p, level);
return 1;
}
static struct rt_page *__pages_alloc(
pgls_agr_t agr_pgls[], rt_uint32_t size_bits, int affid,
void (*page_remove)(rt_page_t *page_head, struct rt_page *p,
rt_uint32_t size_bits),
void (*page_insert)(rt_page_t *page_head, struct rt_page *p,
rt_uint32_t size_bits),
void (*page_alloc)(rt_page_t page))
{
rt_page_t *pgls_head = _get_pgls_head(agr_pgls, affid, size_bits);
rt_page_t p = *pgls_head;
if (p)
{
page_remove(pgls_head, p, size_bits);
}
else
{
rt_uint32_t level;
rt_page_t head;
/* fallback for allocation */
for (level = size_bits + 1; level < RT_PAGE_MAX_ORDER; level++)
{
pgls_head = _get_pgls_head(agr_pgls, affid, level);
p = *pgls_head;
if (p)
{
break;
}
}
if (level == RT_PAGE_MAX_ORDER)
{
return 0;
}
page_remove(pgls_head, p, level);
/* pick the page satisfied the affinity tag */
head = p;
p = head + (affid - (affid & AFFID_BITS_MASK(level)));
page_alloc(p);
/* release the pages caller don't need */
while (level > size_bits)
{
long lower_bits = level - 1;
rt_page_t middle = _buddy_get(head, lower_bits);
if (p >= middle)
{
page_insert(
_get_pgls_head_by_page(agr_pgls, head, lower_bits),
head, lower_bits);
head = middle;
}
else
{
page_insert(
_get_pgls_head_by_page(agr_pgls, middle, lower_bits),
middle, lower_bits);
}
level = lower_bits;
}
}
return p;
}
static struct rt_page *_pages_alloc(pgls_agr_t page_list[],
rt_uint32_t size_bits, int affid)
{
return __pages_alloc(page_list, size_bits, affid, _page_remove,
_page_insert, _page_alloc);
}
static void _early_page_remove(rt_page_t *pgls_head, rt_page_t page,
rt_uint32_t size_bits)
{
rt_page_t page_cont = (rt_page_t)((char *)page + early_offset);
if (page_cont->pre)
{
rt_page_t pre_cont = (rt_page_t)((char *)page_cont->pre + early_offset);
pre_cont->next = page_cont->next;
}
else
{
*pgls_head = page_cont->next;
}
if (page_cont->next)
{
rt_page_t next_cont = (rt_page_t)((char *)page_cont->next + early_offset);
next_cont->pre = page_cont->pre;
}
RT_ASSERT(page_cont->size_bits == size_bits);
page_cont->size_bits = ARCH_ADDRESS_WIDTH_BITS;
page_cont->ref_cnt = 1;
}
static void _early_page_alloc(rt_page_t page)
{
rt_page_t page_cont = (rt_page_t)((char *)page + early_offset);
page_cont->size_bits = ARCH_ADDRESS_WIDTH_BITS;
page_cont->ref_cnt = 1;
}
static void _early_page_insert(rt_page_t *pgls_head, rt_page_t page,
rt_uint32_t size_bits)
{
RT_ASSERT((void *)page >= rt_mpr_start &&
((char *)page - (char *)rt_mpr_start) < rt_mpr_size);
rt_page_t page_cont = (rt_page_t)((char *)page + early_offset);
page_cont->next = *pgls_head;
if (page_cont->next)
{
rt_page_t next_cont = (rt_page_t)((char *)page_cont->next + early_offset);
next_cont->pre = page;
}
page_cont->pre = 0;
*pgls_head = page;
page_cont->size_bits = size_bits;
}
static struct rt_page *_early_pages_alloc(pgls_agr_t page_list[],
rt_uint32_t size_bits, int affid)
{
return __pages_alloc(page_list, size_bits, affid, _early_page_remove,
_early_page_insert, _early_page_alloc);
}
static pgls_agr_t *_get_page_list(void *vaddr)
{
rt_ubase_t pa_int = (rt_ubase_t)vaddr + PV_OFFSET;
pgls_agr_t *list;
if (pa_int > UINT32_MAX)
{
list = page_list_high;
}
else
{
list = page_list_low;
}
return list;
}
int rt_page_ref_get(void *addr, rt_uint32_t size_bits)
{
struct rt_page *p;
rt_base_t level;
int ref;
p = rt_page_addr2page(addr);
level = rt_spin_lock_irqsave(&_pgmgr_lock);
ref = _pages_ref_get(p, size_bits);
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
return ref;
}
void rt_page_ref_inc(void *addr, rt_uint32_t size_bits)
{
struct rt_page *p;
rt_base_t level;
p = rt_page_addr2page(addr);
level = rt_spin_lock_irqsave(&_pgmgr_lock);
_pages_ref_inc(p, size_bits);
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
}
static rt_page_t (*pages_alloc_handler)(pgls_agr_t page_list[],
rt_uint32_t size_bits, int affid);
/* if not, we skip the finding on page_list_high */
static size_t _high_page_configured = 0;
static pgls_agr_t *_flag_to_page_list(size_t flags)
{
pgls_agr_t *page_list;
if (_high_page_configured && (flags & PAGE_ANY_AVAILABLE))
{
page_list = page_list_high;
}
else
{
page_list = page_list_low;
}
return page_list;
}
volatile static rt_ubase_t _last_alloc;
rt_inline void *_do_pages_alloc(rt_uint32_t size_bits, size_t flags, int affid)
{
void *alloc_buf = RT_NULL;
struct rt_page *p;
rt_base_t level;
pgls_agr_t *page_list = _flag_to_page_list(flags);
level = rt_spin_lock_irqsave(&_pgmgr_lock);
p = pages_alloc_handler(page_list, size_bits, affid);
if (p)
{
_freed_nr -= 1 << size_bits;
}
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
if (!p && page_list != page_list_low)
{
/* fall back */
page_list = page_list_low;
level = rt_spin_lock_irqsave(&_pgmgr_lock);
p = pages_alloc_handler(page_list, size_bits, affid);
if (p)
{
_freed_nr -= 1 << size_bits;
_freed_nr_hi -= 1 << size_bits;
}
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
}
if (p)
{
alloc_buf = page_to_addr(p);
_last_alloc = (rt_ubase_t)alloc_buf;
#ifdef RT_DEBUGGING_PAGE_LEAK
level = rt_spin_lock_irqsave(&_spinlock);
TRACE_ALLOC(p, size_bits);
rt_spin_unlock_irqrestore(&_spinlock, level);
#endif
#ifdef RT_DEBUGGING_PAGE_POISON
_unpoisoned_pages(alloc_buf, size_bits);
#endif /* RT_DEBUGGING_PAGE_POISON */
}
return alloc_buf;
}
rt_inline int _get_balanced_id(rt_uint32_t size_bits)
{
rt_ubase_t last_alloc = (_last_alloc / RT_PAGE_AFFINITY_BLOCK_SIZE);
return (last_alloc + (1u << size_bits)) & AFFID_BITS_MASK(size_bits);
}
static void *_do_pages_alloc_noaff(rt_uint32_t size_bits, size_t flags)
{
void *rc = RT_NULL;
if (size_bits < AFFID_BLK_BITS)
{
int try_affid = _get_balanced_id(size_bits);
size_t numof_id = AFFID_NUMOF_ID_IN_SET(size_bits);
size_t valid_affid_mask = numof_id - 1;
for (size_t i = 0; i < numof_id; i++, try_affid += 1 << size_bits)
{
rc = _do_pages_alloc(size_bits, flags, try_affid & valid_affid_mask);
if (rc)
{
break;
}
}
}
else
{
rc = _do_pages_alloc(size_bits, flags, 0);
}
if (!rc)
{
RT_ASSERT(0);
}
return rc;
}
void *rt_pages_alloc(rt_uint32_t size_bits)
{
return _do_pages_alloc_noaff(size_bits, 0);
}
void *rt_pages_alloc_ext(rt_uint32_t size_bits, size_t flags)
{
return _do_pages_alloc_noaff(size_bits, flags);
}
void *rt_pages_alloc_tagged(rt_uint32_t size_bits, long affid, size_t flags)
{
rt_page_t current;
current = _do_pages_alloc(size_bits, flags, affid);
if (current && RT_PAGE_PICK_AFFID(current) != affid)
{
RT_ASSERT(0);
}
return current;
}
int rt_pages_free(void *addr, rt_uint32_t size_bits)
{
struct rt_page *p;
pgls_agr_t *page_list = _get_page_list(addr);
int real_free = 0;
p = rt_page_addr2page(addr);
if (p)
{
rt_base_t level;
level = rt_spin_lock_irqsave(&_pgmgr_lock);
real_free = _pages_free(page_list, p, addr, size_bits);
if (real_free)
{
_freed_nr += 1 << size_bits;
if (page_list == page_list_high)
{
_freed_nr_hi += 1 << size_bits;
}
TRACE_FREE(p, size_bits);
}
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
}
return real_free;
}
/* debug command */
int rt_page_list(void) __attribute__((alias("list_page")));
#define PGNR2SIZE(nr) ((nr)*ARCH_PAGE_SIZE / 1024)
static void _dump_page_list(int order, rt_page_t lp, rt_page_t hp,
rt_size_t *pfree)
{
rt_size_t free = 0;
rt_kprintf("level %d ", order);
while (lp)
{
free += (1UL << order);
rt_kprintf("[L:0x%08p]", rt_page_page2addr(lp));
lp = lp->next;
}
while (hp)
{
free += (1UL << order);
rt_kprintf("[H:0x%08p]", rt_page_page2addr(hp));
hp = hp->next;
}
rt_kprintf("\n");
*pfree += free;
}
int list_page(void)
{
int i;
rt_size_t free = 0;
rt_size_t installed = _page_nr;
rt_base_t level;
level = rt_spin_lock_irqsave(&_pgmgr_lock);
/* dump affinity map area */
for (i = 0; i < AFFID_BLK_BITS; i++)
{
rt_page_t *iter_lo = PGLS_GET_AFF_MAP(page_list_low[i]);
rt_page_t *iter_hi = PGLS_GET_AFF_MAP(page_list_high[i]);
rt_size_t list_len = AFFID_NUMOF_ID_IN_SET(i);
for (size_t j = 0; j < list_len; j++)
{
_dump_page_list(i, iter_lo[j], iter_hi[j], &free);
}
}
/* dump normal page list */
for (; i < RT_PAGE_MAX_ORDER; i++)
{
rt_page_t lp = page_list_low[i].page_list;
rt_page_t hp = page_list_high[i].page_list;
_dump_page_list(i, lp, hp, &free);
}
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
rt_kprintf("-------------------------------\n");
rt_kprintf("Page Summary:\n => free/installed:\n 0x%lx/0x%lx (%ld/%ld KB)\n",
free, installed, PGNR2SIZE(free), PGNR2SIZE(installed));
rt_kprintf(" => Installed Pages Region:\n");
_print_region_list();
rt_kprintf("-------------------------------\n");
return 0;
}
MSH_CMD_EXPORT(list_page, show page info);
void rt_page_get_info(rt_size_t *total_nr, rt_size_t *free_nr)
{
*total_nr = _page_nr;
*free_nr = _freed_nr;
}
void rt_page_high_get_info(rt_size_t *total_nr, rt_size_t *free_nr)
{
*total_nr = _page_nr_hi;
*free_nr = _freed_nr_hi;
}
static void _invalid_uninstalled_shadow(rt_page_t start, rt_page_t end)
{
for (rt_page_t iter = start; iter < end; iter++)
{
rt_base_t frame = (rt_base_t)rt_page_page2addr(iter);
struct installed_page_reg *page_reg = _find_page_region(frame);
if (page_reg)
{
continue;
}
iter->size_bits = ARCH_ADDRESS_WIDTH_BITS;
}
}
static void _install_page(rt_page_t mpr_head, rt_region_t region,
void (*insert)(rt_page_t *ppg, rt_page_t page, rt_uint32_t size_bits))
{
pgls_agr_t *page_list;
rt_page_t *page_head;
rt_region_t shadow;
const rt_base_t pvoffset = PV_OFFSET;
_page_nr += ((region.end - region.start) >> ARCH_PAGE_SHIFT);
_freed_nr += ((region.end - region.start) >> ARCH_PAGE_SHIFT);
shadow.start = region.start & ~shadow_mask;
shadow.end = CEIL(region.end, shadow_mask + 1);
if (shadow.end + pvoffset > UINT32_MAX)
_high_page_configured = 1;
rt_page_t shad_head = addr_to_page(mpr_head, (void *)shadow.start);
rt_page_t shad_tail = addr_to_page(mpr_head, (void *)shadow.end);
rt_page_t head = addr_to_page(mpr_head, (void *)region.start);
rt_page_t tail = addr_to_page(mpr_head, (void *)region.end);
/* mark shadow page records not belongs to other region as illegal */
_invalid_uninstalled_shadow(shad_head, head);
_invalid_uninstalled_shadow(tail, shad_tail);
/* insert reserved pages to list */
const int max_order = RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1;
while (region.start != region.end)
{
struct rt_page *p;
int align_bits;
int size_bits;
int page_order;
size_bits =
ARCH_ADDRESS_WIDTH_BITS - 1 - rt_hw_clz(region.end - region.start);
align_bits = rt_hw_ctz(region.start);
if (align_bits < size_bits)
{
size_bits = align_bits;
}
if (size_bits > max_order)
{
size_bits = max_order;
}
p = addr_to_page(mpr_head, (void *)region.start);
p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
p->ref_cnt = 0;
/* insert to list */
page_list = _get_page_list((void *)region.start);
if (page_list == page_list_high)
{
_page_nr_hi += 1 << (size_bits - ARCH_PAGE_SHIFT);
_freed_nr_hi += 1 << (size_bits - ARCH_PAGE_SHIFT);
}
page_order = size_bits - ARCH_PAGE_SHIFT;
page_head = _get_pgls_head_by_page(page_list, p, page_order);
insert(page_head, (rt_page_t)((char *)p - early_offset), page_order);
region.start += (1UL << size_bits);
}
}
static void *_aligned_to_affinity(rt_ubase_t head_page_pa, void *mapped_to)
{
#define AFFBLK_MASK (RT_PAGE_AFFINITY_BLOCK_SIZE - 1)
rt_ubase_t head_page_pg_aligned;
rt_ubase_t aligned_affblk_tag = (long)mapped_to & AFFBLK_MASK;
head_page_pg_aligned =
((long)head_page_pa & ~AFFBLK_MASK) | aligned_affblk_tag;
if (head_page_pg_aligned < head_page_pa)
{
/* find the page forward */
head_page_pg_aligned += RT_PAGE_AFFINITY_BLOCK_SIZE;
}
return (void *)head_page_pg_aligned;
}
void rt_page_init(rt_region_t reg)
{
int i;
rt_region_t shadow;
/* setup install page status */
rt_spin_lock_init(&_init_region.lock);
_init_region.region_area = reg;
_init_region.next = RT_NULL;
#ifdef RT_DEBUGGING_PAGE_POISON
_init_region.usage_trace = _init_region_usage_trace;
#endif /* RT_DEBUGGING_PAGE_POISON */
_inst_page_reg_head = &_init_region;
/* adjust install region. inclusive start, exclusive end */
reg.start += ARCH_PAGE_MASK;
reg.start &= ~ARCH_PAGE_MASK;
reg.end &= ~ARCH_PAGE_MASK;
if (reg.end <= reg.start)
{
LOG_E("region end(%p) must greater than start(%p)", reg.start, reg.end);
RT_ASSERT(0);
}
shadow.start = reg.start & ~shadow_mask;
shadow.end = CEIL(reg.end, shadow_mask + 1);
LOG_D("[Init page] start: 0x%lx, end: 0x%lx, total: 0x%lx", reg.start,
reg.end, page_nr);
int err;
/* init free list */
rt_page_t *aff_pgls_iter_lo = aff_pglist_low;
rt_page_t *aff_pgls_iter_hi = aff_pglist_high;
for (i = 0; i < AFFID_BLK_BITS; i++)
{
long stride = AFFID_NUMOF_ID_IN_SET(i);
PGLS_FROM_AFF_MAP(page_list_low[i], aff_pgls_iter_lo);
PGLS_FROM_AFF_MAP(page_list_high[i], aff_pgls_iter_hi);
aff_pgls_iter_lo += stride;
aff_pgls_iter_hi += stride;
}
for (; i < RT_PAGE_MAX_ORDER; i++)
{
page_list_low[i].page_list = 0;
page_list_high[i].page_list = 0;
}
/* map MPR area */
err = rt_aspace_map_static(&rt_kernel_space, &mpr_varea, &rt_mpr_start,
rt_mpr_size, MMU_MAP_K_RWCB, MMF_MAP_FIXED,
&mm_page_mapper, 0);
if (err != RT_EOK)
{
LOG_E("MPR map failed with size %lx at %p", rt_mpr_size, rt_mpr_start);
RT_ASSERT(0);
}
/* calculate footprint */
init_mpr_align_start =
(rt_size_t)addr_to_page(page_start, (void *)shadow.start) &
~ARCH_PAGE_MASK;
init_mpr_align_end =
CEIL(addr_to_page(page_start, (void *)shadow.end), ARCH_PAGE_SIZE);
rt_size_t init_mpr_size = init_mpr_align_end - init_mpr_align_start;
rt_size_t init_mpr_npage = init_mpr_size >> ARCH_PAGE_SHIFT;
/* find available aligned page */
init_mpr_cont_start = _aligned_to_affinity(reg.start,
(void *)init_mpr_align_start);
rt_size_t init_mpr_cont_end = (rt_size_t)init_mpr_cont_start + init_mpr_size;
early_offset = (rt_size_t)init_mpr_cont_start - init_mpr_align_start;
rt_page_t mpr_cont = (void *)((char *)rt_mpr_start + early_offset);
/* mark init mpr pages as illegal */
rt_page_t head_cont = addr_to_page(mpr_cont, (void *)reg.start);
rt_page_t tail_cont = addr_to_page(mpr_cont, (void *)reg.end);
for (rt_page_t iter = head_cont; iter < tail_cont; iter++)
{
iter->size_bits = ARCH_ADDRESS_WIDTH_BITS;
}
reg.start = init_mpr_cont_end;
_install_page(mpr_cont, reg, _early_page_insert);
pages_alloc_handler = _early_pages_alloc;
/* doing the page table bushiness */
if (rt_aspace_load_page(&rt_kernel_space, (void *)init_mpr_align_start, init_mpr_npage))
{
LOG_E("%s: failed to load pages", __func__);
RT_ASSERT(0);
}
if (rt_hw_mmu_tbl_get() == rt_kernel_space.page_table)
rt_page_cleanup();
}
static int _load_mpr_area(void *head, void *tail)
{
int err = 0;
char *iter = (char *)((rt_ubase_t)head & ~ARCH_PAGE_MASK);
tail = (void *)CEIL(tail, ARCH_PAGE_SIZE);
while (iter != tail)
{
void *paddr = rt_kmem_v2p(iter);
if (paddr == ARCH_MAP_FAILED)
{
err = rt_aspace_load_page(&rt_kernel_space, iter, 1);
if (err != RT_EOK)
{
LOG_E("%s: failed to load page", __func__);
break;
}
}
iter += ARCH_PAGE_SIZE;
}
return err;
}
static int _get_mpr_ready_n_install(rt_ubase_t inst_head, rt_ubase_t inst_end)
{
int err;
rt_region_t shadow;
rt_region_t region =
{
.start = inst_head,
.end = inst_end,
};
void *head, *tail;
shadow.start = region.start & ~shadow_mask;
shadow.end = CEIL(region.end, shadow_mask + 1);
head = addr_to_page(page_start, (void *)shadow.start);
tail = addr_to_page(page_start, (void *)shadow.end);
err = _load_mpr_area(head, tail);
if (err == RT_EOK)
{
rt_ubase_t level = rt_spin_lock_irqsave(&_pgmgr_lock);
_install_page(rt_mpr_start, region, _page_insert);
rt_spin_unlock_irqrestore(&_pgmgr_lock, level);
}
return err;
}
static void _update_region_list(struct installed_page_reg *member,
rt_ubase_t inst_head, rt_ubase_t inst_end,
rt_bitmap_t *ut_bitmap)
{
rt_spin_lock_init(&member->lock);
rt_spin_lock(&_inst_page_reg_lock);
member->region_area.start = inst_head;
member->region_area.end = inst_end;
#ifdef RT_DEBUGGING_PAGE_POISON
member->usage_trace = ut_bitmap;
#else
RT_UNUSED(ut_bitmap);
#endif /* RT_DEBUGGING_PAGE_POISON */
member->next = _inst_page_reg_head;
_inst_page_reg_head = member;
rt_spin_unlock(&_inst_page_reg_lock);
}
#define _PAGE_STRIPE (1 << (RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1))
int rt_page_install(rt_region_t region)
{
int err = -RT_EINVAL;
if (region.end != region.start && !(region.start & ARCH_PAGE_MASK) &&
!(region.end & ARCH_PAGE_MASK))
{
rt_ubase_t inst_head = region.start;
rt_ubase_t inst_end = region.end;
rt_ubase_t iter = inst_head;
int pages_count = (inst_end - inst_head) / ARCH_PAGE_SIZE;
struct installed_page_reg *installed_pgreg =
rt_calloc(1, sizeof(struct installed_page_reg) +
RT_BITMAP_LEN(pages_count) * sizeof(rt_bitmap_t));
if (installed_pgreg)
{
_update_region_list(installed_pgreg, inst_head, inst_end,
(rt_bitmap_t *)(installed_pgreg + 1));
if ((rt_ubase_t)iter & shadow_mask)
{
iter = RT_ALIGN((rt_ubase_t)inst_head, _PAGE_STRIPE);
_get_mpr_ready_n_install(inst_head, iter < inst_end ? iter : inst_end);
}
for (rt_ubase_t next = iter + _PAGE_STRIPE; next < inst_end;
iter = next, next += _PAGE_STRIPE)
{
_get_mpr_ready_n_install(iter, next);
}
if (iter < inst_end)
{
_get_mpr_ready_n_install(iter, inst_end);
}
}
}
return err;
}
void rt_page_cleanup(void)
{
early_offset = 0;
pages_alloc_handler = _pages_alloc;
}
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