2024年5月11日发(作者:)
SCSI子系统驱动架构
2013-2-2
代码布局:
一、读写数据流:
drivers/scsi/scsi_lib.c
scsi_execute_req===>scsi_execute===>blk_execute_rq===>blk_execute_rq_nowait
错误恢复:
drivers/scsi/scsi_error.c
内核线程scsi_error_handler===>
二、初始化:(本文!)
--------------------------------------------------------------------------------------------------------------------
scsi高层(scsi磁盘)驱动:
1代码分布
2核心调用:
drivers/scsi/sd.c(这里以scsi disk设备为例)
同步执行部分:sd_probe
异步执行部分:sd_probe_async===>sd_revalidate_disk===>sd_spinup_disk
--------------------------------------------------------------------------------------------------------------------
scsi子系统核心初始化:
1代码分布
2核心调用:
scsi_init_queue();
scsi_init_procfs();
scsi_init_devinfo();
scsi_init_hosts();
scsi_init_sysctl();
scsi_sysfs_register();
scsi_netlink_init();
--------------------------------------------------------------------------------------------------------------------
scsi适配器驱动:
1代码分布
2核心调用:
drivers/scsi/hosts.c
1)、struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
2)、scsi_add_host(struct Scsi_Host *host,struct device *dev)
===>scsi_add_host_with_dma(host, dev, dev)
int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, struct device *dma_dev)
3)、scsi_scan_host===>do_scsi_scan_host===>scsi_scan_host_selected===>scsi_scan_channel
===>__scsi_scan_target===>scsi_probe_and_add_lun===>scsi_probe_lun
scsi_add_lun
1
代码骨架:
----------------------------------------------------------------------------------------------------------------------
scsi子系统核心初始化:
drivers/scsi/scsi.c:
static struct class shost_class = {
.name = "scsi_host",
.dev_release = scsi_host_cls_release,
};
static struct class sdev_class = {
.name = "scsi_device",
.dev_release = scsi_device_cls_release,
};
struct bus_type scsi_bus_type = {
.name = "scsi",
.match = scsi_bus_match,
.uevent = scsi_bus_uevent,
};
subsys_initcall(init_scsi)===>
static int __init init_scsi(void)
{
scsi_init_queue();
scsi_init_procfs();
scsi_init_devinfo();//
scsi_init_hosts();//
scsi_init_sysctl();
scsi_sysfs_register();//
scsi_netlink_init();
}
int scsi_init_hosts(void)
{
return class_register(&shost_class);
}
int scsi_sysfs_register(void)
{
int error;
error = bus_register(&scsi_bus_type);
if (!error) {
class_register(&sdev_class);
}
}
----------------------------------------------------------------------------------------------------------------------
scsi HBA驱动:(前端以dmx3191d
为例
)
static struct scsi_host_template dmx3191d_driver_template = {
.name = "Domex DMX3191D",
.queuecommand = NCR5380_queue_command,
2
发布评论