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This patch removes an artificial RapidIO bus root device and establishes actual device hierarchy by providing reference to real parent devices. It also introduces device class for RapidIO controller devices (on-chip or an eternal bridge, known as "mport"). Existing implementation was sufficient for SoC-based platforms that have a single RapidIO controller. With introduction of devices using multiple RapidIO controllers and PCIe-to-RapidIO bridges the old scheme is very limiting or does not work at all. The implemented changes allow to properly reference platform's local RapidIO mport devices and provide device details needed for upper layers. This change to RapidIO device hierarchy does not break any known existing kernel or user space interfaces. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com> Cc: Stef van Os <stef.van.os@prodrive-technologies.com> Cc: Jerry Jacobs <jerry.jacobs@prodrive-technologies.com> Cc: Arno Tiemersma <arno.tiemersma@prodrive-technologies.com> Cc: Rob Landley <rob@landley.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
158 lines
7 KiB
Text
158 lines
7 KiB
Text
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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