xref: /linux/Documentation/ABI/testing/debugfs-driver-qat_telemetry (revision 06d07429858317ded2db7986113a9e0129cd599b)

What:		/sys/kernel/debug/qat_<device>_<BDF>/telemetry/control
Date:		March 2024
KernelVersion:	6.8
Contact:	qat-linux@intel.com
Description:	(RW) Enables/disables the reporting of telemetry metrics.

		Allowed values to write:
		========================
		* 0: disable telemetry
		* 1: enable telemetry
		* 2, 3, 4: enable telemetry and calculate minimum, maximum
		  and average for each counter over 2, 3 or 4 samples

		Returned values:
		================
		* 1-4: telemetry is enabled and running
		* 0: telemetry is disabled

		Example.

		Writing '3' to this file starts the collection of
		telemetry metrics. Samples are collected every second and
		stored in a circular buffer of size 3. These values are then
		used to calculate the minimum, maximum and average for each
		counter. After enabling, counters can be retrieved through
		the ``device_data`` file::

		  echo 3 > /sys/kernel/debug/qat_4xxx_0000:6b:00.0/telemetry/control

		Writing '0' to this file stops the collection of telemetry
		metrics::

		  echo 0 > /sys/kernel/debug/qat_4xxx_0000:6b:00.0/telemetry/control

		This attribute is only available for qat_4xxx devices.

What:		/sys/kernel/debug/qat_<device>_<BDF>/telemetry/device_data
Date:		March 2024
KernelVersion:	6.8
Contact:	qat-linux@intel.com
Description:	(RO) Reports device telemetry counters.
		Reads report metrics about performance and utilization of
		a QAT device:

		=======================	========================================
		Field			Description
		=======================	========================================
		sample_cnt		number of acquisitions of telemetry data
					from the device. Reads are performed
					every 1000 ms.
		pci_trans_cnt		number of PCIe partial transactions
		max_rd_lat		maximum logged read latency [ns] (could
					be any read operation)
		rd_lat_acc_avg		average read latency [ns]
		max_gp_lat		max get to put latency [ns] (only takes
					samples for AE0)
		gp_lat_acc_avg		average get to put latency [ns]
		bw_in			PCIe, write bandwidth [Mbps]
		bw_out			PCIe, read bandwidth [Mbps]
		at_page_req_lat_avg	Address Translator(AT), average page
					request latency [ns]
		at_trans_lat_avg	AT, average page translation latency [ns]
		at_max_tlb_used		AT, maximum uTLB used
		util_cpr<N>		utilization of Compression slice N [%]
		exec_cpr<N>		execution count of Compression slice N
		util_xlt<N>		utilization of Translator slice N [%]
		exec_xlt<N>		execution count of Translator slice N
		util_dcpr<N>		utilization of Decompression slice N [%]
		exec_dcpr<N>		execution count of Decompression slice N
		util_pke<N>		utilization of PKE N [%]
		exec_pke<N>		execution count of PKE N
		util_ucs<N>		utilization of UCS slice N [%]
		exec_ucs<N>		execution count of UCS slice N
		util_wat<N>		utilization of Wireless Authentication
					slice N [%]
		exec_wat<N>		execution count of Wireless Authentication
					slice N
		util_wcp<N>		utilization of Wireless Cipher slice N [%]
		exec_wcp<N>		execution count of Wireless Cipher slice N
		util_cph<N>		utilization of Cipher slice N [%]
		exec_cph<N>		execution count of Cipher slice N
		util_ath<N>		utilization of Authentication slice N [%]
		exec_ath<N>		execution count of Authentication slice N
		=======================	========================================

		The telemetry report file can be read with the following command::

		  cat /sys/kernel/debug/qat_4xxx_0000:6b:00.0/telemetry/device_data

		If ``control`` is set to 1, only the current values of the
		counters are displayed::

		  <counter_name> <current>

		If ``control`` is 2, 3 or 4, counters are displayed in the
		following format::

		  <counter_name> <current> <min> <max> <avg>

		If a device lacks of a specific accelerator, the corresponding
		attribute is not reported.

		This attribute is only available for qat_4xxx devices.

What:		/sys/kernel/debug/qat_<device>_<BDF>/telemetry/rp_<A/B/C/D>_data
Date:		March 2024
KernelVersion:	6.8
Contact:	qat-linux@intel.com
Description:	(RW) Selects up to 4 Ring Pairs (RP) to monitor, one per file,
		and report telemetry counters related to each.

		Allowed values to write:
		========================
		* 0 to ``<num_rps - 1>``:
		  Ring pair to be monitored. The value of ``num_rps`` can be
		  retrieved through ``/sys/bus/pci/devices/<BDF>/qat/num_rps``.
		  See Documentation/ABI/testing/sysfs-driver-qat.

		Reads report metrics about performance and utilization of
		the selected RP:

		=======================	========================================
		Field			Description
		=======================	========================================
		sample_cnt		number of acquisitions of telemetry data
					from the device. Reads are performed
					every 1000 ms
		rp_num			RP number associated with slot <A/B/C/D>
		service_type		service associated to the RP
		pci_trans_cnt		number of PCIe partial transactions
		gp_lat_acc_avg		average get to put latency [ns]
		bw_in			PCIe, write bandwidth [Mbps]
		bw_out			PCIe, read bandwidth [Mbps]
		at_glob_devtlb_hit	Message descriptor DevTLB hit rate
		at_glob_devtlb_miss	Message descriptor DevTLB miss rate
		tl_at_payld_devtlb_hit	Payload DevTLB hit rate
		tl_at_payld_devtlb_miss	Payload DevTLB miss rate
		======================= ========================================

		Example.

		Writing the value '32' to the file ``rp_C_data`` starts the
		collection of telemetry metrics for ring pair 32::

		  echo 32 > /sys/kernel/debug/qat_4xxx_0000:6b:00.0/telemetry/rp_C_data

		Once a ring pair is selected, statistics can be read accessing
		the file::

		  cat /sys/kernel/debug/qat_4xxx_0000:6b:00.0/telemetry/rp_C_data

		If ``control`` is set to 1, only the current values of the
		counters are displayed::

		  <counter_name> <current>

		If ``control`` is 2, 3 or 4, counters are displayed in the
		following format::

		  <counter_name> <current> <min> <max> <avg>


		On QAT GEN4 devices there are 64 RPs on a PF, so the allowed
		values are 0..63. This number is absolute to the device.
		If Virtual Functions (VF) are used, the ring pair number can
		be derived from the Bus, Device, Function of the VF:

		============ ====== ====== ====== ======
		PCI BDF/VF   RP0    RP1    RP2    RP3
		============ ====== ====== ====== ======
		0000:6b:0.1  RP  0  RP  1  RP  2  RP  3
		0000:6b:0.2  RP  4  RP  5  RP  6  RP  7
		0000:6b:0.3  RP  8  RP  9  RP 10  RP 11
		0000:6b:0.4  RP 12  RP 13  RP 14  RP 15
		0000:6b:0.5  RP 16  RP 17  RP 18  RP 19
		0000:6b:0.6  RP 20  RP 21  RP 22  RP 23
		0000:6b:0.7  RP 24  RP 25  RP 26  RP 27
		0000:6b:1.0  RP 28  RP 29  RP 30  RP 31
		0000:6b:1.1  RP 32  RP 33  RP 34  RP 35
		0000:6b:1.2  RP 36  RP 37  RP 38  RP 39
		0000:6b:1.3  RP 40  RP 41  RP 42  RP 43
		0000:6b:1.4  RP 44  RP 45  RP 46  RP 47
		0000:6b:1.5  RP 48  RP 49  RP 50  RP 51
		0000:6b:1.6  RP 52  RP 53  RP 54  RP 55
		0000:6b:1.7  RP 56  RP 57  RP 58  RP 59
		0000:6b:2.0  RP 60  RP 61  RP 62  RP 63
		============ ====== ====== ====== ======

		The mapping is only valid for the BDFs of VFs on the host.


		The service provided on a ring-pair varies depending on the
		configuration. The configuration for a given device can be
		queried and set using ``cfg_services``.
		See Documentation/ABI/testing/sysfs-driver-qat for details.

		The following table reports how ring pairs are mapped to VFs
		on the PF 0000:6b:0.0 configured for `sym;asym` or `asym;sym`:

		=========== ============ =========== ============ ===========
		PCI BDF/VF  RP0/service  RP1/service RP2/service  RP3/service
		=========== ============ =========== ============ ===========
		0000:6b:0.1 RP 0 asym    RP 1 sym    RP 2 asym    RP 3 sym
		0000:6b:0.2 RP 4 asym    RP 5 sym    RP 6 asym    RP 7 sym
		0000:6b:0.3 RP 8 asym    RP 9 sym    RP10 asym    RP11 sym
		...         ...          ...         ...          ...
		=========== ============ =========== ============ ===========

		All VFs follow the same pattern.


		The following table reports how ring pairs are mapped to VFs on
		the PF 0000:6b:0.0 configured for `dc`:

		=========== ============ =========== ============ ===========
		PCI BDF/VF  RP0/service  RP1/service RP2/service  RP3/service
		=========== ============ =========== ============ ===========
		0000:6b:0.1 RP 0 dc      RP 1 dc     RP 2 dc      RP 3 dc
		0000:6b:0.2 RP 4 dc      RP 5 dc     RP 6 dc      RP 7 dc
		0000:6b:0.3 RP 8 dc      RP 9 dc     RP10 dc      RP11 dc
		...         ...          ...         ...          ...
		=========== ============ =========== ============ ===========

		The mapping of a RP to a service can be retrieved using
		``rp2srv`` from sysfs.
		See Documentation/ABI/testing/sysfs-driver-qat for details.

		This attribute is only available for qat_4xxx devices.