549 lines
14 KiB
C
549 lines
14 KiB
C
/**
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* @file share_mem.c
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* @author zhangzheng (1358745329@qq.com)
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* @brief
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* @version 0.1
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* @date 2023-12-31
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*
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* @copyright Copyright (c) 2023
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*
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*/
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#include <types.h>
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#include <kobject.h>
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#include <task.h>
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#include <thread.h>
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#include <factory.h>
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#include <string.h>
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#include <slab.h>
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#include <vma.h>
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#include "mm_wrap.h"
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#include "mpu.h"
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#include "init.h"
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#include "dlist.h"
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#if IS_ENABLED(CONFIG_BUDDY_SLAB)
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#include <slab.h>
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static slab_t *share_mem_slab;
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static slab_t *share_mem_task_node_slab;
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#endif
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/**
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* @brief 存储task的节点
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*
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*/
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typedef struct share_mem_task_node
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{
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dlist_item_t node;
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task_t *task;
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vaddr_t addr;
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} share_mem_task_node_t;
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typedef enum share_mem_type
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{
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SHARE_MEM_CNT_BUDDY_CNT, //!< buddy分配的连续内存，最大4M，默认的内存分配方式
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SHARE_MEM_CNT_CMA_CNT, //!< cma分配的连续内存
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SHARE_MEM_CNT_DPD, //!< 离散内存
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} share_mem_type_t;
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/**
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* @brief 共享内存对象
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*
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*/
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typedef struct share_mem
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{
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kobject_t kobj; //!< 内核对象
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struct
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{
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void *mem; //!< 内存指针(连续内存时使用)
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void **mem_array; //!< 离散内存时当数组地址使用，数组内存放离散内存的地址
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};
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size_t size; //!< 内存大小，(根据arch不同，size大小可能会被限制为，例如：n^2）。
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dlist_head_t task_head; //!< 哪些任务使用了该共享内存
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share_mem_type_t mem_type; //!< 内存类型
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ram_limit_t *lim; //!< 内存限额
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} share_mem_t;
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enum share_mem_op
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{
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SHARE_MEM_MAP,
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SHARE_MEM_UNMAP,
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};
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static void share_mem_slab_init(void)
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{
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#if IS_ENABLED(CONFIG_BUDDY_SLAB)
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share_mem_slab = slab_create(sizeof(share_mem_t), "share_mem");
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assert(share_mem_slab);
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share_mem_task_node_slab = slab_create(sizeof(share_mem_task_node_t), "share_mem_task_node");
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sizeof(share_mem_task_node_slab);
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#endif
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}
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INIT_KOBJ_MEM(share_mem_slab_init);
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/**
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* @brief 共享内存解除映射
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*
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* @param sm
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* @return int
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*/
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static void *share_mem_unmap_task(share_mem_t *sm)
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{
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vaddr_t vaddr = 0;
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share_mem_task_node_t *pos;
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umword_t status = spinlock_lock(&sm->kobj.lock);
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if (status < 0)
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{
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return NULL;
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}
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task_t *tk = thread_get_current_task();
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dlist_foreach(&sm->task_head, pos, share_mem_task_node_t, node)
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{
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if (pos->task == tk)
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{
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dlist_del(&sm->task_head, &pos->node);
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#if IS_ENABLED(CONFIG_MMU)
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mm_limit_free_slab(share_mem_task_node_slab, tk->lim, pos);
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#else
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mm_limit_free(tk->lim, pos);
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#endif
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vaddr = pos->addr;
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break;
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}
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}
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spinlock_set(&sm->kobj.lock, status);
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return (void *)vaddr;
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}
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/**
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* @brief 共享内存映射
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*
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* @param task
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*/
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static int share_mem_map_task(share_mem_t *sm, vaddr_t addr)
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{
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int ret = -1;
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int flag = 0;
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share_mem_task_node_t *pos;
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umword_t status = spinlock_lock(&sm->kobj.lock);
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if (status < 0)
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{
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return status;
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}
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task_t *tk = thread_get_current_task();
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dlist_foreach(&sm->task_head, pos, share_mem_task_node_t, node)
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{
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if (pos->task == tk)
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{
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flag = 1;
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break;
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}
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}
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if (!flag)
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{
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// 没有找到则插入一个新的
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share_mem_task_node_t *task_node;
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#if IS_ENABLED(CONFIG_MMU)
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task_node = mm_limit_alloc_slab(share_mem_task_node_slab, tk->lim);
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#else
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task_node = mm_limit_alloc(tk->lim, sizeof(share_mem_task_node_t));
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#endif
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if (!task_node)
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{
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// 内存分配失败
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ref_counter_dec_and_release(&tk->ref_cn, &tk->kobj);
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spinlock_set(&sm->kobj.lock, status);
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ret = -ENOMEM;
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goto end;
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}
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dlist_item_init(&task_node->node);
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task_node->task = tk;
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task_node->addr = addr;
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dlist_add_head(&sm->task_head, &task_node->node);
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ref_counter_inc(&tk->ref_cn);
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ret = 0;
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}
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else
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{
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ret = 1;
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}
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end:
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spinlock_set(&sm->kobj.lock, status);
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return ret;
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}
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static int share_mem_free_pmem(share_mem_t *obj)
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{
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assert(obj);
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switch (obj->mem_type)
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{
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case SHARE_MEM_CNT_BUDDY_CNT:
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#if IS_ENABLED(CONFIG_MMU)
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mm_limit_free_buddy(obj->lim, obj->mem, obj->size);
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#else
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mm_limit_free_align(obj->lim, obj->mem, obj->size);
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#endif
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break;
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case SHARE_MEM_CNT_CMA_CNT:
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/*TODO:support CMA mem.*/
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return -ENOSYS;
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case SHARE_MEM_CNT_DPD:
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{
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#if IS_ENABLED(CONFIG_MMU)
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for (ssize_t st = 0; st < obj->size; st += PAGE_SIZE)
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{
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mm_limit_free_buddy(obj->lim, obj->mem_array[st / PAGE_SIZE], PAGE_SIZE);
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}
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int mem_cnt = ROUND_UP(obj->size, PAGE_SIZE);
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size_t mem_array_size = ALIGN(mem_cnt * sizeof(void *), PAGE_SIZE);
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mm_limit_free_buddy(obj->lim, obj->mem_array, mem_array_size);
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#else
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return -ENOSYS;
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#endif
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}
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break;
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}
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return 0;
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}
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/**
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* @brief 申请物理内存
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*
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* @param obj
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* @return int
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*/
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static int share_mem_alloc_pmem(share_mem_t *obj)
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{
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int align_size = 0;
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assert(obj);
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if (obj->mem)
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{
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return 0;
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}
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switch (obj->mem_type)
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{
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case SHARE_MEM_CNT_BUDDY_CNT:
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#if IS_ENABLED(CONFIG_MMU)
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obj->mem = mm_limit_alloc_buddy(obj->lim, obj->size);
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#else
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align_size = obj->size;
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#if CONFIG_MK_MPU_CFG
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#if CONFIG_MPU_VERSION == 1
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if (obj->size < (1UL << CONFIG_PAGE_SHIFT) || !is_power_of_2(obj->size))
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{
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//!< 大小必须是2的整数倍
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return -EINVAL;
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}
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align_size = obj->size;
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#elif CONFIG_MPU_VERSION == 2
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if (obj->size < MPU_ALIGN_SIZE || (obj->size & (MPU_ALIGN_SIZE - 1)))
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{
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//!< 大小必须是2的整数倍
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return -EINVAL;
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}
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obj->size += MPU_ALIGN_SIZE;
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align_size = MPU_ALIGN_SIZE;
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#endif
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#else
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align_size = sizeof(void *);
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#endif
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obj->mem = mm_limit_alloc_align(obj->lim, obj->size, align_size);
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#endif
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if (obj->mem == NULL)
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{
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return -ENOMEM;
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}
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memset(obj->mem, 0, obj->size);
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break;
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case SHARE_MEM_CNT_CMA_CNT:
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/*TODO:support CMA mem.*/
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return -ENOSYS;
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case SHARE_MEM_CNT_DPD:
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{
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#if IS_ENABLED(CONFIG_MMU)
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/** 非连续内存，按页申请 */
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int mem_cnt = ROUND_UP(obj->size, PAGE_SIZE);
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size_t mem_array_size = ALIGN(mem_cnt * sizeof(void *), PAGE_SIZE);
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obj->mem_array = (void **)mm_limit_alloc_buddy(obj->lim, mem_array_size);
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if (!obj->mem_array)
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{
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return -ENOMEM;
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}
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memset(obj->mem_array, 0, mem_array_size);
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for (int i = 0; i < mem_cnt; i++)
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{
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obj->mem_array[i] = mm_limit_alloc_buddy(obj->lim, PAGE_SIZE);
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if (obj->mem_array[i] == NULL)
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{
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/* 内存不足，释放申请的内存 */
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mm_limit_free_buddy(obj->lim, obj->mem_array, mem_array_size);
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for (int j = 0; j < i; j++)
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{
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mm_limit_free_buddy(obj->lim, obj->mem_array[j], PAGE_SIZE);
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}
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obj->mem_array = NULL;
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return -ENOMEM;
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}
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memset(obj->mem_array[i], 0, PAGE_SIZE);
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}
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#else
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return -ENOSYS;
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#endif
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}
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break;
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}
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return 0;
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}
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/**
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* @brief 共享内存执行映射操作
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*
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* @param obj 共享内存对象
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* @param addr 映射到的虚拟地址，以及属性
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* @return int
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*/
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static ssize_t share_mem_map(share_mem_t *obj, vma_addr_t addr, vaddr_t *ret_vaddr)
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{
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int ret;
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assert(obj);
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assert(ret_vaddr);
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ssize_t map_size = 0;
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task_t *task = thread_get_current_task();
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#if IS_ENABLED(CONFIG_MMU)
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vaddr_t ret_addr;
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addr.flags |= VMA_ADDR_RESV; //!< 设置为保留内存，保留内存的物理内存，不在内核中申请
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ret = task_vma_alloc(&task->mm_space.mem_vma, addr, obj->size, 0, &ret_addr); //!< 申请虚拟内存
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if (ret < 0)
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{
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return ret;
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}
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switch (obj->mem_type)
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{
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case SHARE_MEM_CNT_BUDDY_CNT:
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case SHARE_MEM_CNT_CMA_CNT:
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{
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for (ssize_t st = ret_addr; st < ret_addr + obj->size; st += PAGE_SIZE, map_size += PAGE_SIZE)
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{
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ret = task_vma_page_fault(&task->mm_space.mem_vma, st, obj->mem + (st - ret_addr));
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if (ret < 0)
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{
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printk("%s:%d task map failed, pmem:0x%lx vmem:0x%lx.\n", obj->mem + (st - ret_addr), st);
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break;
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}
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}
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}
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break;
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case SHARE_MEM_CNT_DPD:
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{
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for (ssize_t st = ret_addr; st < ret_addr + obj->size; st += PAGE_SIZE, map_size += PAGE_SIZE)
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{
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ret = task_vma_page_fault(&task->mm_space.mem_vma, st, obj->mem_array[(st - ret_addr) / PAGE_SIZE]);
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if (ret < 0)
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{
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printk("%s:%d task map failed, pmem:0x%lx vmem:0x%lx.\n", obj->mem + (st - ret_addr), st);
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break;
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}
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}
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}
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break;
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}
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*ret_vaddr = ret_addr;
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if (map_size == 0)
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{
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return ret;
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}
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#else
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ret = task_vma_alloc(&task->mm_space.mem_vma, addr, obj->size, (vaddr_t)(obj->mem), ret_vaddr);
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if (ret < 0)
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{
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return ret;
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}
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map_size = obj->size;
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// *ret_vaddr = (vaddr_t)(obj->mem);
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#endif
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return map_size;
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}
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static int share_mem_unmap(share_mem_t *obj, vaddr_t vaddr)
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{
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task_t *task = thread_get_current_task();
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task_vma_free_pmem(&task->mm_space.mem_vma, vaddr, obj->size, FALSE);
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return 0;
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}
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static void share_mem_syscall(kobject_t *kobj, syscall_prot_t sys_p, msg_tag_t in_tag, entry_frame_t *f)
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{
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ssize_t ret;
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msg_tag_t tag = msg_tag_init4(0, 0, 0, -EINVAL);
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task_t *task = thread_get_current_task();
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share_mem_t *sm = container_of(kobj, share_mem_t, kobj);
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if (sys_p.prot != SHARE_MEM_PROT)
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{
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f->regs[0] = msg_tag_init4(0, 0, 0, -EPROTO).raw;
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return;
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}
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switch (sys_p.op)
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{
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case SHARE_MEM_MAP:
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{
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vma_addr_t vma_addr;
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vaddr_t ret_vaddr;
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ret = share_mem_alloc_pmem(sm); //!< 如果内存没有申请，则申请内存
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if (ret < 0)
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{
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goto end;
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}
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vma_addr = vma_addr_create_raw(f->regs[0]);
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ret = share_mem_map(sm, vma_addr, &ret_vaddr); //!< 执行映射操作
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if (ret < 0)
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{
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goto end;
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}
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ret = share_mem_map_task(sm, ret_vaddr); //!< 存储那些task使用了该share mem.
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if (ret < 0)
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{
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share_mem_unmap(sm, ret_vaddr);
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ret = -EAGAIN;
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goto end;
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}
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f->regs[1] = (umword_t)ret_vaddr;
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f->regs[2] = sm->size;
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end:
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tag = msg_tag_init4(0, 0, 0, ret);
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}
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break;
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case SHARE_MEM_UNMAP:
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{
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vaddr_t addr;
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// 从记录中删除
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addr = (vaddr_t)share_mem_unmap_task(sm);
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if (addr)
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{
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share_mem_unmap(sm, addr);
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ref_counter_dec_and_release(&task->ref_cn, &task->kobj);
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}
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tag = msg_tag_init4(0, 0, 0, 0);
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}
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break;
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}
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f->regs[0] = tag.raw;
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}
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static void share_mem_obj_unmap(obj_space_t *obj_space, kobject_t *kobj)
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{
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task_t *task = container_of(obj_space, task_t, obj_space);
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share_mem_t *sm = container_of(kobj, share_mem_t, kobj);
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vaddr_t addr;
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// 从记录中删除
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addr = (vaddr_t)share_mem_unmap_task(sm);
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if (addr)
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{
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share_mem_unmap(sm, addr);
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ref_counter_dec_and_release(&task->ref_cn, &task->kobj);
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}
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}
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static void share_mem_release_stage1(kobject_t *kobj)
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{
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share_mem_t *sm = container_of(kobj, share_mem_t, kobj);
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kobject_invalidate(kobj);
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}
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static void share_mem_release_stage2(kobject_t *kobj)
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{
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share_mem_t *sm = container_of(kobj, share_mem_t, kobj);
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assert(dlist_is_empty(&sm->task_head));
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#if IS_ENABLED(CONFIG_MMU)
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share_mem_free_pmem(sm);
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mm_limit_free_slab(share_mem_slab, sm->lim, sm);
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#else
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mm_limit_free_align(sm->lim, sm->mem, sm->size);
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mm_limit_free(sm->lim, sm);
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#endif
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printk("share mem 0x%x free.\n", sm);
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}
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/**
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* @brief share_mem init.
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*
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* @param fac 初始化的share_mem对象
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* @param max 最大限额值
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*/
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static void share_mem_init(share_mem_t *sm, umword_t max)
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{
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kobject_init(&sm->kobj, SHARE_MEM_TYPE);
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sm->size = max;
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sm->kobj.invoke_func = share_mem_syscall;
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sm->kobj.unmap_func = share_mem_obj_unmap;
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sm->kobj.stage_1_func = share_mem_release_stage1;
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sm->kobj.stage_2_func = share_mem_release_stage2;
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}
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/**
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* @brief 创建共享内存对象
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*
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* @param lim
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* @param max
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* @return share_mem_t*
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*/
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static share_mem_t *share_mem_create(ram_limit_t *lim, share_mem_type_t type, size_t max)
|
||
{
|
||
share_mem_t *mem;
|
||
|
||
#if IS_ENABLED(CONFIG_MMU)
|
||
mem = mm_limit_alloc_slab(share_mem_slab, lim);
|
||
|
||
if (mem == NULL)
|
||
{
|
||
return NULL;
|
||
}
|
||
memset(mem, 0, sizeof(share_mem_t));
|
||
max = ALIGN(max, (1 << CONFIG_PAGE_SHIFT));
|
||
#else
|
||
mem = mm_limit_alloc(lim, sizeof(share_mem_t));
|
||
|
||
if (!mem)
|
||
{
|
||
return NULL;
|
||
}
|
||
#endif
|
||
mem->lim = lim;
|
||
mem->mem_type = type;
|
||
share_mem_init(mem, max);
|
||
return mem;
|
||
}
|
||
/**
|
||
* @brief 共享内存对象创建的回调函数
|
||
*
|
||
* @param lim
|
||
* @param arg0
|
||
* @param arg1
|
||
* @param arg2
|
||
* @param arg3
|
||
* @return kobject_t*
|
||
*/
|
||
static kobject_t *share_mem_func(ram_limit_t *lim, umword_t arg0, umword_t arg1,
|
||
umword_t arg2, umword_t arg3)
|
||
{
|
||
share_mem_t *irq = share_mem_create(lim, arg0, arg1);
|
||
|
||
if (!irq)
|
||
{
|
||
return NULL;
|
||
}
|
||
return &irq->kobj;
|
||
}
|
||
/**
|
||
* @brief 工厂注册函数
|
||
*
|
||
*/
|
||
static void share_mem_register(void)
|
||
{
|
||
factory_register(share_mem_func, SHARE_MEM_PROT);
|
||
}
|
||
INIT_KOBJ(share_mem_register);
|