linux/Documentation/rapidio/sysfs.txt
<<
>>
Prefs
   1                         RapidIO sysfs Files
   2
   3~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4
   51. Device Subdirectories
   6------------------------
   7
   8For each RapidIO device, the RapidIO subsystem creates files in an individual
   9subdirectory with the following name, /sys/bus/rapidio/devices/<device_name>.
  10
  11The format of device_name is "nn:d:iiii", where:
  12
  13nn - two-digit hexadecimal ID of RapidIO network where the device resides
  14d  - device typr: 'e' - for endpoint or 's' - for switch
  15iiii - four-digit device destID for endpoints, or switchID for switches
  16
  17For example, below is a list of device directories that represents a typical
  18RapidIO network with one switch, one host, and two agent endpoints, as it is
  19seen 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
  25NOTE: An enumerating or discovering endpoint does not create a sysfs entry for
  26itself, this is why an endpoint with destID=1 is not shown in the list.
  27
  282. Attributes Common for All Devices
  29------------------------------------
  30
  31Each device subdirectory contains the following informational read-only files:
  32
  33       did - returns the device identifier
  34       vid - returns the device vendor identifier
  35device_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
  44In addition to the files listed above, each device has a binary attribute file
  45that allows read/write access to the device configuration registers using
  46the RapidIO maintenance transactions:
  47
  48 config - reads from and writes to the device configuration registers.
  49
  50This attribute is similar in behavior to the "config" attribute of PCI devices
  51and provides an access to the RapidIO device registers using standard file read
  52and write operations.
  53
  543. Endpoint Device Attributes
  55-----------------------------
  56
  57Currently Linux RapidIO subsystem does not create any endpoint specific sysfs
  58attributes. It is possible that RapidIO master port drivers and endpoint device
  59drivers will add their device-specific sysfs attributes but such attributes are
  60outside the scope of this document.
  61
  624. Switch Device Attributes
  63---------------------------
  64
  65RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports
  66common and device-specific sysfs attributes for switches. Because switches are
  67integrated into the RapidIO subsystem, it offers a method to create
  68device-specific sysfs attributes by specifying a callback function that may be
  69set by the switch initialization routine during enumeration or discovery process.
  70
  714.1 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
  844.2 Device-specific Switch Attributes
  85
  86Device-specific switch attributes are listed for each RapidIO switch driver
  87that exports additional attributes.
  88
  89IDT_GEN2:
  90 errlog - reads contents of device error log until it is empty.
  91
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.