Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-firmware-sgi_uv b/Documentation/ABI/testing/sysfs-firmware-sgi_uv
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+What:		/sys/firmware/sgi_uv/
+Date:		September 2020
+Contact:	Justin Ernst <justin.ernst@hpe.com>
+Description:
+		The /sys/firmware/sgi_uv directory contains information
+		about the UV platform.
+
+		Under that directory are a number of read-only attributes::
+
+			archtype
+			hub_type
+			hubless
+			partition_id
+			coherence_id
+			uv_type
+
+		The archtype entry contains the UV architecture type that
+		is used to select arch-dependent addresses and features.
+		It can be set via the OEM_ID in the ACPI MADT table or by
+		UVsystab entry both passed from UV BIOS.
+
+		The hub_type entry is used to select the type of hub which is
+		similar to uv_type but encoded in a binary format.  Include
+		the file uv_hub.h to get the definitions.
+
+		The hubless entry basically is present and set only if there
+		is no hub.  In this case the hub_type entry is not present.
+
+		The partition_id entry contains the partition id.
+		UV systems can be partitioned into multiple physical
+		machines, which each partition running a unique copy
+		of the operating system. Each partition will have a unique
+		partition id.
+
+		The coherence_id entry contains the coherence id.
+		A partitioned UV system can have one or more coherence
+		domains. The coherence id indicates which coherence domain
+		this partition is in.
+
+		The uv_type entry contains the hub revision number.
+		This value can be used to identify the UV system version::
+
+			"0.*" = Hubless UV ('*' is subtype)
+			"3.0" = UV2
+			"5.0" = UV3
+			"7.0" = UV4
+			"7.1" = UV4a
+			"9.0" = UV5
+
+		The /sys/firmware/sgi_uv directory also contains two directories::
+
+			hubs/
+			pcibuses/
+
+		The hubs directory contains a number of hub objects, each representing
+		a UV Hub visible to the BIOS. Each hub object's name is appended by a
+		unique ordinal value (ex. /sys/firmware/sgi_uv/hubs/hub_5)
+
+		Each hub object directory contains a number of read-only attributes::
+
+			cnode
+			location
+			name
+			nasid
+			shared
+			this_partition
+
+		The cnode entry contains the cnode number of the corresponding hub.
+		If a cnode value is not applicable, the value returned will be -1.
+
+		The location entry contains the location string of the corresponding hub.
+		This value is used to physically identify a hub within a system.
+
+		The name entry contains the name of the corresponding hub. This name can
+		be two variants::
+
+			"UVHub x.x" = A 'node' ASIC, connecting a CPU to the interconnect
+			fabric. The 'x.x' value represents the ASIC revision.
+			(ex. 'UVHub 5.0')
+
+			"NLxRouter" = A 'router ASIC, only connecting other ASICs to
+			the interconnect fabric. The 'x' value representing
+			the fabric technology version. (ex. 'NL8Router')
+
+		The nasid entry contains the nasid number of the corresponding hub.
+		If a nasid value is not applicable, the value returned will be -1.
+
+		The shared entry contains a boolean value describing whether the
+		corresponding hub is shared between system partitions.
+
+		The this_partition entry contains a boolean value describing whether
+		the corresponding hub is local to the current partition.
+
+		Each hub object directory also contains a number of port objects,
+		each representing a fabric port on the corresponding hub.
+		A port object's name is appended by a unique ordinal value
+		(ex. /sys/firmware/sgi_uv/hubs/hub_5/port_3)
+
+		Each port object directory contains a number of read-only attributes::
+
+			conn_hub
+			conn_port
+
+		The conn_hub entry contains a value representing the unique
+		ordinal value of the hub on the other end of the fabric
+		cable plugged into the port. If the port is disconnected,
+		the value returned will be -1.
+
+		The conn_port entry contains a value representing the unique
+		ordinal value of the port on the other end of the fabric cable
+		plugged into the port. If the port is disconnected, the value
+		returned will be -1.
+
+		Ex:
+			A value of '3' is read from:
+				/sys/firmware/sgi_uv/hubs/hub_5/port_3/conn_hub
+
+			and a value of '6' is read from:
+				/sys/firmware/sgi_uv/hubs/hub_5/port_3/conn_port
+
+			representing that this port is connected to:
+				/sys/firmware/sgi_uv/hubs/hub_3/port_6
+
+		The pcibuses directory contains a number of PCI bus objects.
+		Each PCI bus object's name is appended by its PCI bus address.
+		(ex. pcibus_0003:80)
+
+		Each pcibus object has a number of possible read-only attributes::
+
+			type
+			location
+			slot
+			ppb_addr
+			iio_stack
+
+		The type entry contains a value describing the type of IO at
+		the corresponding PCI bus address. Known possible values
+		across all UV versions are::
+
+			BASE IO
+			PCIe IO
+			PCIe SLOT
+			NODE IO
+			Riser
+			PPB
+
+		The location entry contains the location string of the UV Hub
+		of the CPU physically connected to the corresponding PCI bus.
+
+		The slot entry contains the physical slot number of the
+		corresponding PCI bus. This value is used to physically locate
+		PCI cards within a system.
+
+		The ppb_addr entry contains the PCI address string of the
+		bridged PCI bus. This entry is only present when the PCI bus
+		object type is 'PPB'.
+
+		The iio_stack entry contains a value describing the IIO stack
+		number that the corresponding PCI bus object is connected to.