1 What: /sys/bus/cdx/rescan 2 Date: March 2023 3 Contact: nipun.gupta@amd.com 4 Description: 5 Writing y/1/on to this file will cause rescan of the bus 6 and devices on the CDX bus. Any new devices are scanned and 7 added to the list of Linux devices and any devices removed are 8 also deleted from Linux. 9 10 For example:: 11 12 # echo 1 > /sys/bus/cdx/rescan 13 14 What: /sys/bus/cdx/devices/.../vendor 15 Date: March 2023 16 Contact: nipun.gupta@amd.com 17 Description: 18 Vendor ID for this CDX device, in hexadecimal. Vendor ID is 19 16 bit identifier which is specific to the device manufacturer. 20 Combination of Vendor ID and Device ID identifies a device. 21 22 What: /sys/bus/cdx/devices/.../device 23 Date: March 2023 24 Contact: nipun.gupta@amd.com 25 Description: 26 Device ID for this CDX device, in hexadecimal. Device ID is 27 16 bit identifier to identify a device type within the range 28 of a device manufacturer. 29 Combination of Vendor ID and Device ID identifies a device. 30 31 What: /sys/bus/cdx/devices/.../subsystem_vendor 32 Date: July 2023 33 Contact: puneet.gupta@amd.com 34 Description: 35 Subsystem Vendor ID for this CDX device, in hexadecimal. 36 Subsystem Vendor ID is 16 bit identifier specific to the 37 card manufacturer. 38 39 What: /sys/bus/cdx/devices/.../subsystem_device 40 Date: July 2023 41 Contact: puneet.gupta@amd.com 42 Description: 43 Subsystem Device ID for this CDX device, in hexadecimal 44 Subsystem Device ID is 16 bit identifier specific to the 45 card manufacturer. 46 47 What: /sys/bus/cdx/devices/.../class 48 Date: July 2023 49 Contact: puneet.gupta@amd.com 50 Description: 51 This file contains the class of the CDX device, in hexadecimal. 52 Class is 24 bit identifier specifies the functionality of the device. 53 54 What: /sys/bus/cdx/devices/.../revision 55 Date: July 2023 56 Contact: puneet.gupta@amd.com 57 Description: 58 This file contains the revision field of the CDX device, in hexadecimal. 59 Revision is 8 bit revision identifier of the device. 60 61 What: /sys/bus/cdx/devices/.../enable 62 Date: October 2023 63 Contact: abhijit.gangurde@amd.com 64 Description: 65 CDX bus should be disabled before updating the devices in FPGA. 66 Writing n/0/off will attempt to disable the CDX bus and. 67 writing y/1/on will attempt to enable the CDX bus. Reading this file 68 gives the current state of the bus, 1 for enabled and 0 for disabled. 69 70 For example:: 71 72 # echo 1 > /sys/bus/cdx/.../enable 73 74 What: /sys/bus/cdx/devices/.../reset 75 Date: March 2023 76 Contact: nipun.gupta@amd.com 77 Description: 78 Writing y/1/on to this file resets the CDX device or all devices 79 on the bus. On resetting the device, the corresponding driver is 80 notified twice, once before the device is being reset, and again 81 after the reset has been complete. 82 83 For example:: 84 85 # echo 1 > /sys/bus/cdx/.../reset 86 87 What: /sys/bus/cdx/devices/.../remove 88 Date: March 2023 89 Contact: tarak.reddy@amd.com 90 Description: 91 Writing y/1/on to this file removes the corresponding 92 device from the CDX bus. If the device is to be reconfigured 93 reconfigured in the Hardware, the device can be removed, so 94 that the device driver does not access the device while it is 95 being reconfigured. 96 97 For example:: 98 99 # echo 1 > /sys/bus/cdx/devices/.../remove 100 101 What: /sys/bus/cdx/devices/.../resource<N> 102 Date: July 2023 103 Contact: puneet.gupta@amd.com 104 Description: 105 The resource binary file contains the content of the memory 106 regions. These files can be m'maped from userspace. 107 108 What: /sys/bus/cdx/devices/.../modalias 109 Date: July 2023 110 Contact: nipun.gupta@amd.com 111 Description: 112 This attribute indicates the CDX ID of the device. 113 That is in the format: 114 cdx:vXXXXdXXXXsvXXXXsdXXXXcXXXXXX, 115 where: 116 117 - vXXXX contains the vendor ID; 118 - dXXXX contains the device ID; 119 - svXXXX contains the subsystem vendor ID; 120 - sdXXXX contains the subsystem device ID; 121 - cXXXXXX contains the device class.
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