stm32mp157 - 基于5.10.61内核的块设备驱动实现（ramdisk）

chinacool_00

在5.10.61(可能在5.0之后)的内核版本中已经弃用了blk_queue_make_request， blk_init_queue等等函数，导致在调试块驱动无IO调度器的例程时出现编译错误。


刚开始有点懵，查了好多资料也没有具体的一个说明，最终还是在内核中找到相关代码借鉴，要改的地方如下：








/*
* Handler function for all zram I/O requests.
增加
*/
static blk_qc_t ramdisk_submit_bio(struct bio *bio)
{
        struct ramdisk_dev *zram = bio->bi_disk->private_data;

        ramdisk_make_request_fn(zram->queue, bio);
        return BLK_QC_T_NONE;

error:
        bio_io_error(bio);
        return BLK_QC_T_NONE;
}



/*
* 块设备操作函数
*/
static struct block_device_operations ramdisk_fops =
{
        .owner         = THIS_MODULE,
        .open         = ramdisk_open,
        .release = ramdisk_release,
        .getgeo  = ramdisk_getgeo,
        .submit_bio = ramdisk_submit_bio,    //增加
};



/*
* @description        : 初始化队列相关操作
* @set                         : blk_mq_tag_set对象
* @return                 : request_queue的地址
*/
static struct request_queue * create_req_queue(struct ramdisk_dev *set)
{
        struct request_queue *q;


#if 0


        q = blk_alloc_queue(GFP_KERNEL); //(set->numa_node);
        if (!q)
                return ERR_PTR(-ENOMEM);
       
        blk_queue_make_request(q, ramdisk_make_request_fn);
       
#else  // 修改代码
        q = blk_alloc_queue(NUMA_NO_NODE); //(set->numa_node);
        if (!q)
                return ERR_PTR(-ENOMEM);
       
        /* zram devices sort of resembles non-rotational disks */
        blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
        blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);


        /*
         * To ensure that we always get PAGE_SIZE aligned
         * and n*PAGE_SIZED sized I/O requests.
         */
        blk_queue_physical_block_size(q, PAGE_SIZE);
        blk_queue_logical_block_size(q, (1UL<<12));
        blk_queue_io_min(q, PAGE_SIZE);
        blk_queue_io_opt(q, PAGE_SIZE);
        q->limits.discard_granularity = PAGE_SIZE;
        blk_queue_max_discard_sectors(q, UINT_MAX);
        blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);


        /*
         * zram_bio_discard() will clear all logical blocks if logical block
         * size is identical with physical block size(PAGE_SIZE). But if it is
         * different, we will skip discarding some parts of logical blocks in
         * the part of the request range which isn't aligned to physical block
         * size.  So we can't ensure that all discarded logical blocks are
         * zeroed.
         */
        //if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE)
                blk_queue_max_write_zeroes_sectors(q, UINT_MAX);


        blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
#endif


    q->queuedata = set;
        return q;
}