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Documentation / rapidio / sysfs.txt

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Based on kernel version 3.13. Page generated on 2014-01-20 22:04 EST.

1	                         RapidIO sysfs Files
3	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5	1. Device Subdirectories
6	------------------------
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>.
11	The format of device_name is "nn:d:iiii", where:
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
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):
21	/sys/bus/rapidio/devices/00:e:0000
22	/sys/bus/rapidio/devices/00:e:0002
23	/sys/bus/rapidio/devices/00:s:0001
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.
28	2. Attributes Common for All Devices
29	------------------------------------
31	Each device subdirectory contains the following informational read-only files:
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	  modalias - returns the device modalias
45	In addition to the files listed above, each device has a binary attribute file
46	that allows read/write access to the device configuration registers using
47	the RapidIO maintenance transactions:
49	 config - reads from and writes to the device configuration registers.
51	This attribute is similar in behavior to the "config" attribute of PCI devices
52	and provides an access to the RapidIO device registers using standard file read
53	and write operations.
55	3. Endpoint Device Attributes
56	-----------------------------
58	Currently Linux RapidIO subsystem does not create any endpoint specific sysfs
59	attributes. It is possible that RapidIO master port drivers and endpoint device
60	drivers will add their device-specific sysfs attributes but such attributes are
61	outside the scope of this document.
63	4. Switch Device Attributes
64	---------------------------
66	RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports
67	common and device-specific sysfs attributes for switches. Because switches are
68	integrated into the RapidIO subsystem, it offers a method to create
69	device-specific sysfs attributes by specifying a callback function that may be
70	set by the switch initialization routine during enumeration or discovery process.
72	4.1 Common Switch Attributes
74	   routes - reports switch routing information in "destID port" format. This
75	            attribute reports only valid routing table entries, one line for
76	            each entry.
77	   destid - device destination ID that defines a route to the switch
78	 hopcount - number of hops on the path to the switch
79	    lnext - returns names of devices linked to the switch except one of a device
80	            linked to the ingress port (reported as "lprev"). This is an array
81	            names with number of lines equal to number of ports in switch. If
82	            a switch port has no attached device, returns "null" instead of
83	            a device name.
85	4.2 Device-specific Switch Attributes
87	Device-specific switch attributes are listed for each RapidIO switch driver
88	that exports additional attributes.
90	IDT_GEN2:
91	 errlog - reads contents of device error log until it is empty.
94	5. RapidIO Bus Attributes
95	-------------------------
97	RapidIO bus subdirectory /sys/bus/rapidio implements the following bus-specific
98	attribute:
100	  scan - allows to trigger enumeration discovery process from user space. This
101		 is a write-only attribute. To initiate an enumeration or discovery
102		 process on specific mport device, a user needs to write mport_ID (not
103		 RapidIO destination ID) into this file. The mport_ID is a sequential
104		 number (0 ... RIO_MAX_MPORTS) assigned to the mport device.
105		 For example, for a machine with a single RapidIO controller, mport_ID
106		 for that controller always will be 0.
107		 To initiate RapidIO enumeration/discovery on all available mports
108		 a user must write '-1' (or RIO_MPORT_ANY) into this attribute file.
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