Documentation / rapidio / sysfs.txt
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Based on kernel version 3.9. Page generated on 2013-05-02 23:12 EST.
1 RapidIO sysfs Files 2 3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 5 1. Device Subdirectories 6 ------------------------ 7 8 For each RapidIO device, the RapidIO subsystem creates files in an individual 9 subdirectory with the following name, /sys/bus/rapidio/devices/<device_name>. 10 11 The format of device_name is "nn:d:iiii", where: 12 13 nn - two-digit hexadecimal ID of RapidIO network where the device resides 14 d - device typr: 'e' - for endpoint or 's' - for switch 15 iiii - four-digit device destID for endpoints, or switchID for switches 16 17 For example, below is a list of device directories that represents a typical 18 RapidIO network with one switch, one host, and two agent endpoints, as it is 19 seen by the enumerating host (destID = 1): 20 21 /sys/bus/rapidio/devices/00:e:0000 22 /sys/bus/rapidio/devices/00:e:0002 23 /sys/bus/rapidio/devices/00:s:0001 24 25 NOTE: An enumerating or discovering endpoint does not create a sysfs entry for 26 itself, this is why an endpoint with destID=1 is not shown in the list. 27 28 2. Attributes Common for All Devices 29 ------------------------------------ 30 31 Each device subdirectory contains the following informational read-only files: 32 33 did - returns the device identifier 34 vid - returns the device vendor identifier 35 device_rev - returns the device revision level 36 asm_did - returns identifier for the assembly containing the device 37 asm_rev - returns revision level of the assembly containing the device 38 asm_vid - returns vendor identifier of the assembly containing the device 39 destid - returns device destination ID assigned by the enumeration routine 40 (see 4.1 for switch specific details) 41 lprev - returns name of previous device (switch) on the path to the device 42 that that owns this attribute 43 44 In addition to the files listed above, each device has a binary attribute file 45 that allows read/write access to the device configuration registers using 46 the RapidIO maintenance transactions: 47 48 config - reads from and writes to the device configuration registers. 49 50 This attribute is similar in behavior to the "config" attribute of PCI devices 51 and provides an access to the RapidIO device registers using standard file read 52 and write operations. 53 54 3. Endpoint Device Attributes 55 ----------------------------- 56 57 Currently Linux RapidIO subsystem does not create any endpoint specific sysfs 58 attributes. It is possible that RapidIO master port drivers and endpoint device 59 drivers will add their device-specific sysfs attributes but such attributes are 60 outside the scope of this document. 61 62 4. Switch Device Attributes 63 --------------------------- 64 65 RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports 66 common and device-specific sysfs attributes for switches. Because switches are 67 integrated into the RapidIO subsystem, it offers a method to create 68 device-specific sysfs attributes by specifying a callback function that may be 69 set by the switch initialization routine during enumeration or discovery process. 70 71 4.1 Common Switch Attributes 72 73 routes - reports switch routing information in "destID port" format. This 74 attribute reports only valid routing table entries, one line for 75 each entry. 76 destid - device destination ID that defines a route to the switch 77 hopcount - number of hops on the path to the switch 78 lnext - returns names of devices linked to the switch except one of a device 79 linked to the ingress port (reported as "lprev"). This is an array 80 names with number of lines equal to number of ports in switch. If 81 a switch port has no attached device, returns "null" instead of 82 a device name. 83 84 4.2 Device-specific Switch Attributes 85 86 Device-specific switch attributes are listed for each RapidIO switch driver 87 that exports additional attributes. 88 89 IDT_GEN2: 90 errlog - reads contents of device error log until it is empty.
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