159 lines
7.0 KiB
Plaintext
159 lines
7.0 KiB
Plaintext
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RapidIO sysfs Files
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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1. RapidIO Device Subdirectories
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--------------------------------
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For each RapidIO device, the RapidIO subsystem creates files in an individual
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subdirectory with the following name, /sys/bus/rapidio/devices/<device_name>.
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The format of device_name is "nn:d:iiii", where:
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nn - two-digit hexadecimal ID of RapidIO network where the device resides
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d - device typr: 'e' - for endpoint or 's' - for switch
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iiii - four-digit device destID for endpoints, or switchID for switches
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For example, below is a list of device directories that represents a typical
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RapidIO network with one switch, one host, and two agent endpoints, as it is
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seen by the enumerating host (destID = 1):
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/sys/bus/rapidio/devices/00:e:0000
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/sys/bus/rapidio/devices/00:e:0002
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/sys/bus/rapidio/devices/00:s:0001
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NOTE: An enumerating or discovering endpoint does not create a sysfs entry for
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itself, this is why an endpoint with destID=1 is not shown in the list.
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2. Attributes Common for All RapidIO Devices
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--------------------------------------------
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Each device subdirectory contains the following informational read-only files:
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did - returns the device identifier
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vid - returns the device vendor identifier
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device_rev - returns the device revision level
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asm_did - returns identifier for the assembly containing the device
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asm_rev - returns revision level of the assembly containing the device
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asm_vid - returns vendor identifier of the assembly containing the device
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destid - returns device destination ID assigned by the enumeration routine
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(see 4.1 for switch specific details)
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lprev - returns name of previous device (switch) on the path to the device
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that that owns this attribute
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modalias - returns the device modalias
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In addition to the files listed above, each device has a binary attribute file
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that allows read/write access to the device configuration registers using
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the RapidIO maintenance transactions:
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config - reads from and writes to the device configuration registers.
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This attribute is similar in behavior to the "config" attribute of PCI devices
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and provides an access to the RapidIO device registers using standard file read
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and write operations.
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3. RapidIO Endpoint Device Attributes
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-------------------------------------
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Currently Linux RapidIO subsystem does not create any endpoint specific sysfs
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attributes. It is possible that RapidIO master port drivers and endpoint device
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drivers will add their device-specific sysfs attributes but such attributes are
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outside the scope of this document.
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4. RapidIO Switch Device Attributes
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-----------------------------------
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RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports
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common and device-specific sysfs attributes for switches. Because switches are
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integrated into the RapidIO subsystem, it offers a method to create
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device-specific sysfs attributes by specifying a callback function that may be
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set by the switch initialization routine during enumeration or discovery process.
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4.1 Common Switch Attributes
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routes - reports switch routing information in "destID port" format. This
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attribute reports only valid routing table entries, one line for
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each entry.
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destid - device destination ID that defines a route to the switch
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hopcount - number of hops on the path to the switch
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lnext - returns names of devices linked to the switch except one of a device
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linked to the ingress port (reported as "lprev"). This is an array
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names with number of lines equal to number of ports in switch. If
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a switch port has no attached device, returns "null" instead of
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a device name.
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4.2 Device-specific Switch Attributes
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Device-specific switch attributes are listed for each RapidIO switch driver
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that exports additional attributes.
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IDT_GEN2:
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errlog - reads contents of device error log until it is empty.
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5. RapidIO Bus Attributes
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-------------------------
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RapidIO bus subdirectory /sys/bus/rapidio implements the following bus-specific
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attribute:
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scan - allows to trigger enumeration discovery process from user space. This
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is a write-only attribute. To initiate an enumeration or discovery
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process on specific mport device, a user needs to write mport_ID (not
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RapidIO destination ID) into this file. The mport_ID is a sequential
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number (0 ... RIO_MAX_MPORTS) assigned to the mport device.
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For example, for a machine with a single RapidIO controller, mport_ID
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for that controller always will be 0.
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To initiate RapidIO enumeration/discovery on all available mports
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a user must write '-1' (or RIO_MPORT_ANY) into this attribute file.
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6. RapidIO Bus Controllers/Ports
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--------------------------------
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On-chip RapidIO controllers and PCIe-to-RapidIO bridges (referenced as
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"Master Port" or "mport") are presented in sysfs as the special class of
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devices: "rapidio_port".
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The /sys/class/rapidio_port subdirectory contains individual subdirectories
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named as "rapidioN" where N = mport ID registered with RapidIO subsystem.
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NOTE: An mport ID is not a RapidIO destination ID assigned to a given local
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mport device.
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Each mport device subdirectory in addition to standard entries contains the
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following device-specific attributes:
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port_destid - reports RapidIO destination ID assigned to the given RapidIO
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mport device. If value 0xFFFFFFFF is returned this means that
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no valid destination ID have been assigned to the mport (yet).
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Normally, before enumeration/discovery have been executed only
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fabric enumerating mports have a valid destination ID assigned
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to them using "hdid=..." rapidio module parameter.
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sys_size - reports RapidIO common transport system size:
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0 = small (8-bit destination ID, max. 256 devices),
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1 = large (16-bit destination ID, max. 65536 devices).
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After enumeration or discovery was performed for a given mport device,
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the corresponding subdirectory will also contain subdirectories for each
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child RapidIO device connected to the mport. Naming conventions for RapidIO
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devices are described in Section 1 above.
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The example below shows mport device subdirectory with several child RapidIO
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devices attached to it.
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[rio@rapidio ~]$ ls /sys/class/rapidio_port/rapidio0/ -l
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total 0
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0001
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0004
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0007
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0002
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0003
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drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0005
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lrwxrwxrwx 1 root root 0 Feb 11 15:11 device -> ../../../0000:01:00.0
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-r--r--r-- 1 root root 4096 Feb 11 15:11 port_destid
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drwxr-xr-x 2 root root 0 Feb 11 15:11 power
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lrwxrwxrwx 1 root root 0 Feb 11 15:04 subsystem -> ../../../../../../class/rapidio_port
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-r--r--r-- 1 root root 4096 Feb 11 15:11 sys_size
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-rw-r--r-- 1 root root 4096 Feb 11 15:04 uevent
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