函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\resource.c Create Date:2022-07-27 10:05:17
Last Modify:2022-05-22 11:14:39 Copyright©Brick
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函数名称：__request_region - create a new busy resource region*@parent: parent resource descriptor*@start: resource start address*@n: resource region size*@name: reserving caller's ID string*@flags: IO resource flags

函数原型：struct resource *__request_region(struct resource *parent, resource_size_t start, resource_size_t n, const char *name, int flags)

返回类型：struct resource

参数：

类型参数名称
struct resource *parent
resource_size_tstart
resource_size_tn
const char *name
intflags
1127  DECLARE_WAITQUEUE(wait, 当前进程)
1128  res等于alloc_resource(GFP_KERNEL)
1130  如果非res则返回:NULL
1133  name等于name
1134  start等于start
1135  end等于start加n减1
1137  write_lock( & resource_lock)
1139  循环
1142  flags等于resource_type(parent)按位或resource_ext_type(parent)
1143  flags或等于Driver has marked this resource busy 按位或flags
1144  desc等于desc
1146  conflict等于Return the conflict entry if you can't request it
1147  如果非conflict则退出
1154  如果desc恒等于IORES_DESC_DEVICE_PRIVATE_MEMORY则
1155  打印警告信息("Unaddressable device %s %pR conflicts with %pR", name, conflict, res)
1158  如果conflict不等于parent则
1159  如果非flags按位与Driver has marked this resource busy 的值则
1160  parent等于conflict
1161  继续下一循环
1164  如果flags按位与flags按位与Resource is software muxed 则
1165  add_wait_queue( & This is compatibility stuff for IO resources.* Note how this, unlike the above, knows about* the IO flag meanings (busy etc).* request_region creates a new busy region.* release_region releases a matching busy region., & wait)
1166  write_unlock( & resource_lock)
1167  set_current_state(深度睡眠态)
1168  schedule()
1169  remove_wait_queue( & This is compatibility stuff for IO resources.* Note how this, unlike the above, knows about* the IO flag meanings (busy etc).* request_region creates a new busy region.* release_region releases a matching busy region., & wait)
1170  write_lock( & resource_lock)
1171  继续下一循环
1174  free_resource(res)
1175  res = NULL
1176  退出
1178  write_unlock( & resource_lock)
1179  返回:res
调用者
名称描述
__devm_request_region
register_memory_resourceadd this memory to iomem resource