Cache Coherent 非一致性内存解决与验证
2016-03-10 16:08
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1 摘要
使用J6平台开发项目中，使用DMA拷贝数据，针对DMA物理内存和Cache的一致性进行测试和验证。2 解决方法和目的
方法目的：使用dma_sync_single_for_device();dma_sync_single_for_cpu()对内存进行一致性管理，通过下文的介绍可以正确使用这两个函数。方法验证：
A. 验证Cache与DMA存在不一致的问题。
B. dma_sync_single_for_device();dma_sync_single_for_cpu()对物理内存和Cache的实际操作内容。
C. 验证函数效率。
2.1 INV和CLEAN概念
（invalidate）清除cache的意思是清除cache中存储的全部数据。对处理器而言，清除操作只要清零相应cache行的有效位即可。当存储器配置上有变化时，整体或部分cache可能需要进行清除操作。（clean）清理cache的意思是把脏的（即被改写过的）cache行强制写到主存，并把cache行中的脏位清零。清理cache可以重建cache与主存之间的一致性，它只用在使用写回策略的D-cache上。
2.2 测试使用程序列表
| 名称 | 功能 |
| Dmatest | 测试应用程序 |
| omap_ds_dma.ko | 测试对应驱动程序 |
2.3 测试程序命令列表
| 命令名称 | 功能 |
| @cc <n> | Set cache on(1)/off(0)驱动内DMA的cache管理功能 |
| @ccsrc [size] | Make src cached |
| @ccdst [size] | Make dst cached |
| @ccsrcn [size] | Make src cached write 0x66 |
| @ccdstn [size] | Make src cached write 0x33 |
| @up | Update src dynamic val |
| @dmacp | Dma Cp test 0x1000 DMAsrc->dst拷贝4K |
| @dmacp1 | Dma Cp test max DMAsrc->dst拷贝8M |
| @dmacpn <n> | Dma Cp test n times |
| @showm <addr> | Show Mem 0x---- test 显示物理地址内数据 |
| @shows | Show Mem 0xAC000000 |
| @showd | Show Mem 0xAC800000 |
| @coset <val> | Set coherent data 设置Coherent驱动内缓冲区的值 |
| @coshow | Show coherent data显示Coherent驱动内缓冲区的值 |
| @setwb <paddr> | Set write back 设置指定区域的clean功能WB |
| @setinv <paddr> | Set invalide 设置指定区域的invalid功能 |
| @cotocc | Coherent to cache Coherent to dst(cached) DMA拷贝 |
| @cctoco | Cache to Coherent dst(cached) to Coherent 的DMA拷贝 |
| @exit | |
| @help | |
2.4 验证条件
a. 驱动程序提供一块一致性内存;b. 使用物理内存0xAC000000~0xAC800000为src带cache内存。
c. 使用物理内存0xAC800000~0xAD000000为dst带cache内存
2.5 验证1一致性问题存在
使用DMA将no cache数据传送到cached内存，需要将目的内存进行cache，然后启动DMA，再查看目的内存的内容，结果会导致CPU与物理内存不一致<UT>:coset 0x65
[61901.806422]
[D]Paddr:0xAB859000 Paddr:0xEB859000
[D]coset 0x65
=============BUFF MSG============
[D] 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
[D] 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
[D] 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
[D] 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
[D]
[D]=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
=============BUFF END============
<UT>:cotocc
cotocc
func_get_coherent_arg ioctl paddr 0xab859000, size 0x00001000,
Dma Cp [0xAB859000] -> [0xAC800000] oK,Use time: 1009 us
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
4000
65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65 65
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
=============BUFF END============
<UT>:
已验证，会导致数据不一致。
2.6 验证2 invalidate功能清除cache
验证cache invalidate清除功能，使用函数dma_sync_single_for_cpu(NULL,paddr, size,DMA_FROM_DEVICE);
参数如设置成DMA_TO_DEVICE，该函数什么都不做。
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
=============BUFF END============
<UT>:coset 0x43
[62750.244259]
[D]Paddr:0xAB859000 Paddr:0xEB859000
[D]coset 0x43
=============BUFF MSG============
[D] 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
[D] 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
[D] 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
[D] 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
[D]
[D]=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
=============BUFF END============
<UT>:cotocc
cotocc
func_get_coherent_arg ioctl paddr 0xab859000, size 0x00001000,
Dma Cp [0xAB859000] -> [0xAC800000] oK,Use time: 1009 us
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88
=============BUFF END============
<UT>:setinv 0xac800000
[62763.252850]
[62763.252850] [D]Paddr:0xAC800000 Size:0x00001000
setinv 0xac800000
INVALIDE addr is 0xAC800000
func_get_coherent_arg ioctl paddr 0xab859000, size 0x00001000,
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E0C000
=============BUFF MSG============
43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
=============BUFF END============
<UT>:
已验证cache invalidate将cache中的dirty位清除。当再次读取时，会重内存中读取数据。
2.7 验证3 clean清理功能将cache写入内存
验证Clean功能，使用函数dma_sync_single_for_device(NULL,paddr, size, DMA_TO_DEVICE);
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F
72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
=============BUFF END============
<UT>:ccdstn
ccdstn
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
=============BUFF END============
<UT>:cctoco
cctoco
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAC800000] -> [0xAB85A000] oK,Use time: 1008 us
<UT>:coshow
[71527.657295]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coshow
=============BUFF MSG============
[D] 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
[D] 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F
[D] 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F
[D] 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F
[D]
[D]=============BUFF END============
<UT>:setwb 0xac800000
[71532.627374]
[71532.627374] [D]Paddr:0xAC800000 Size:0x00001000
setwb 0xac800000
WRITE_CB addr is 0xAC800000
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
<UT>:cctoco
cctoco
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAC800000] -> [0xAB85A000] oK,Use time: 1008 us
<UT>:coshow
[71541.280669]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coshow
=============BUFF MSG============
[D] 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
[D] 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
[D] 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
[D] 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
[D]
[D]=============BUFF END============
2.8 验证4 clean清理功能cache改写才能写入内存
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
=============BUFF END============
<UT>:coset 0
[74406.875787]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coset 0
=============BUFF MSG============
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D]
[D]=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
=============BUFF END============
<UT>:cotocc
cotocc
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAB85A000] -> [0xAC800000] oK,Use time: 1008 us
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
=============BUFF END============
<UT>:setwb 0xac800000
[74412.795170]
[74412.795170] [D]Paddr:0xAC800000 Size:0x00001000
setwb 0xac800000
WRITE_CB addr is 0xAC800000
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63
=============BUFF END============
<UT>:cctoco
cctoco
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAC800000] -> [0xAB85A000] oK,Use time: 1010 us
<UT>:coshow
[74422.187135]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coshow
=============BUFF MSG============
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D]
[D]=============BUFF END============
。。。。。。。。。。。
<UT>:showd
showd
pMemDstVirtAddr is 0xB5EA8000
=============BUFF MSG============
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0cf
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=============BUFF END============
验证到cache的clean功能，在cache未由cpu改写的情况下，并不能把物理内存变化的cache部分进行强制写入。
验证改写部分
<UT>:
<UT>:coset 0
[75962.455990]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coset 0
=============BUFF MSG============
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D]
[D]=============BUFF END============
<UT>:dmacp
dmacp
Dma Cp [0xAC000000] -> [0xAC800000] oK,Use time: 1010 us
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E4F000
=============BUFF MSG============
FF 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E
1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E
3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E
5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E
=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E4F000
=============BUFF MSG============
FF 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E
1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E
3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E
5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E
=============BUFF END============
<UT>:cotocc
cotocc
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAB85A000] -> [0xAC800000] oK,Use time: 1007 us
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E4F000
=============BUFF MSG============
FF 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E
1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E
3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E
5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E
=============BUFF END============
<UT>:ccdstn
ccdstn
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E4F000
=============BUFF MSG============
32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
=============BUFF END============
<UT>:setwb 0xac800000
[75993.171957]
[75993.171957] [D]Paddr:0xAC800000 Size:0x00001000
setwb 0xac800000
WRITE_CB addr is 0xAC800000
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
<UT>:cctoco
cctoco
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAC800000] -> [0xAB85A000] oK,Use time: 1009 us
<UT>:coshow
[76001.389677]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coshow
=============BUFF MSG============
[D] 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
[D] 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
[D] 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
[D] 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
[D]
[D]=============BUFF END============
验证结果
当cache被改写，后执行setwb 0xac800000会强制写入内存。
2.9 验证5 clean清理功能将cache改写后数据相同也有效
[D]coshow=============BUFF MSG============
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[D]
[D]=============BUFF END============
<UT>:showd
showd
pMemDstVirtAddr is 0xB5E4F000
=============BUFF MSG============
32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
=============BUFF END============
<UT>:ccdstn
ccdstn
<UT>:setwb 0xac800000
[76396.223846]
[76396.223846] [D]Paddr:0xAC800000 Size:0x00001000
setwb 0xac800000
WRITE_CB addr is 0xAC800000
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
<UT>:cctoco
cctoco
func_get_coherent_arg ioctl paddr 0xab85a000, size 0x00001000,
Dma Cp [0xAC800000] -> [0xAB85A000] oK,Use time: 1009 us
<UT>:coshow
[76401.636119]
[D]Paddr:0xAB85A000 Paddr:0xEB85A000
[D]coshow
=============BUFF MSG============
[D] 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51
[D] 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71
[D] 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91
[D] 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1
[D]
[D]=============BUFF END============
进一步验证得到cache对应的内容只要被再次写入，尽管是相同的数据，Clean也会强制写入内存。
2.10验证效率与flush_cache_all()对比
A. 使用上面函数dma_sync_single_for_cpu和dma_sync_single_for_device测试效率入口位置Start前使用1次src清理和1次dst清理，DMA 完成使用1次dst清除。
B. flush_cache_all() 两次清理和一次清除所花费的时间
C. 入口位置Start前使用1次all，DMA 完成使用1次all。
3 其他
无。
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