mmc_test.c研究mmc模块使用方法

mmc_test.c研究mmc模块使用方法

1. make menuconfig --> Kernel hacking --> 选中Debug Filesystem (CONFIG_DEBUG_FS)选项。

CONFIG_MMC_DEBUG=y

CONFIG_MMC_TEST=y

vi drivers/mmc/card/mmc_test.c

 fs_initcall(mmc_test_init);

//module_init(mmc_test_init);

2.mount -t debugfs none /sys/kernel/debug

3./sys/kernel/debug/mmc0/mmc0:aaaa# ls

state     status    test      testlist

4.cat testlist

1:      Basic write (no data verification)

2:      Basic read (no data verification)

3:      Basic write (with data verification)

4:      Basic read (with data verification)

5:      Multi-block write

6:      Multi-block read

7:      Power of two block writes

8:      Power of two block reads

9:      Weird sized block writes

10:     Weird sized block reads

11:     Badly aligned write

12:     Badly aligned read

13:     Badly aligned multi-block write

14:     Badly aligned multi-block read

15:     Correct xfer_size at write (start failure)

16:     Correct xfer_size at read (start failure)

17:     Correct xfer_size at write (midway failure)

18:     Correct xfer_size at read (midway failure)

19:     Highmem write

20:     Highmem read

21:     Multi-block highmem write

22:     Multi-block highmem read

23:     Best-case read performance

24:     Best-case write performance

25:     Best-case read performance into scattered pages

26:     Best-case write performance from scattered pages

27:     Single read performance by transfer size

28:     Single write performance by transfer size

29:     Single trim performance by transfer size

30:     Consecutive read performance by transfer size

31:     Consecutive write performance by transfer size

32:     Consecutive trim performance by transfer size

33:     Random read performance by transfer size

34:     Random write performance by transfer size

35:     Large sequential read into scattered pages

36:     Large sequential write from scattered pages

37:     Write performance with blocking req 4k to 4MB

38:     Write performance with non-blocking req 4k to 4MB

39:     Read performance with blocking req 4k to 4MB

40:     Read performance with non-blocking req 4k to 4MB

41:     Write performance blocking req 1 to 512 sg elems

42:     Write performance non-blocking req 1 to 512 sg elems

43:     Read performance blocking req 1 to 512 sg elems

44:     Read performance non-blocking req 1 to 512 sg elems

45:     eMMC hardware reset

5.echo 2 > test

[ 1599.710000] mmc0: Starting tests of card mmc0:aaaa...

[ 1599.720000] mmc0: Test case 2. Basic read (no data verification)...

[ 1599.730000] mmc0: Result: OK

[ 1599.740000] mmc0: Tests completed.