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Merge branch 'linus' into x86/build to pick up dependencies
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‎.gitignore

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@@ -127,3 +127,7 @@ all.config
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# Kdevelop4
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*.kdev4
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#Automatically generated by ASN.1 compiler
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net/ipv4/netfilter/nf_nat_snmp_basic-asn1.c
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net/ipv4/netfilter/nf_nat_snmp_basic-asn1.h

‎Documentation/ABI/testing/sysfs-ata

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What: /sys/class/ata_...
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Date: August 2008
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Contact: Gwendal Grignou<[email protected]>
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Description:
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Provide a place in sysfs for storing the ATA topology of the system. This allows
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retrieving various information about ATA objects.
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Provide a place in sysfs for storing the ATA topology of the
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system. This allows retrieving various information about ATA
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objects.
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Files under /sys/class/ata_port
108
-------------------------------
119

12-
For each port, a directory ataX is created where X is the ata_port_id of
13-
the port. The device parent is the ata host device.
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For each port, a directory ataX is created where X is the ata_port_id of the
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port. The device parent is the ata host device.
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idle_irq (read)
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Number of IRQ received by the port while idle [some ata HBA only].
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What: /sys/class/ata_port/ataX/nr_pmp_links
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What: /sys/class/ata_port/ataX/idle_irq
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Date: May, 2010
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KernelVersion: v2.6.37
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Contact: Gwendal Grignou <[email protected]>
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Description:
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nr_pmp_links: (RO) If a SATA Port Multiplier (PM) is
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connected, the number of links behind it.
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nr_pmp_links (read)
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idle_irq: (RO) Number of IRQ received by the port while
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idle [some ata HBA only].
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If a SATA Port Multiplier (PM) is connected, number of link behind it.
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What: /sys/class/ata_port/ataX/port_no
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Date: May, 2013
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KernelVersion: v3.11
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Contact: Gwendal Grignou <[email protected]>
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Description:
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(RO) Host local port number. While registering host controller,
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port numbers are tracked based upon number of ports available on
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the controller. This attribute is needed by udev for composing
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persistent links in /dev/disk/by-path.
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Files under /sys/class/ata_link
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-------------------------------
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Behind each port, there is a ata_link. If there is a SATA PM in the
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topology, 15 ata_link objects are created.
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If a link is behind a port, the directory name is linkX, where X is
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ata_port_id of the port.
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If a link is behind a PM, its name is linkX.Y where X is ata_port_id
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of the parent port and Y the PM port.
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Behind each port, there is a ata_link. If there is a SATA PM in the topology, 15
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ata_link objects are created.
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hw_sata_spd_limit
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If a link is behind a port, the directory name is linkX, where X is ata_port_id
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of the port. If a link is behind a PM, its name is linkX.Y where X is
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ata_port_id of the parent port and Y the PM port.
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Maximum speed supported by the connected SATA device.
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sata_spd_limit
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What: /sys/class/ata_link/linkX[.Y]/hw_sata_spd_limit
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What: /sys/class/ata_link/linkX[.Y]/sata_spd_limit
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What: /sys/class/ata_link/linkX[.Y]/sata_spd
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Date: May, 2010
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KernelVersion: v2.6.37
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Contact: Gwendal Grignou <[email protected]>
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Description:
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hw_sata_spd_limit: (RO) Maximum speed supported by the
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connected SATA device.
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Maximum speed imposed by libata.
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sata_spd_limit: (RO) Maximum speed imposed by libata.
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sata_spd
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sata_spd: (RO) Current speed of the link
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eg. 1.5, 3 Gbps etc.
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Current speed of the link [1.5, 3Gps,...].
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Files under /sys/class/ata_device
4765
---------------------------------
4866

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Behind each link, up to two ata device are created.
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The name of the directory is devX[.Y].Z where:
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- X is ata_port_id of the port where the device is connected,
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- Y the port of the PM if any, and
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- Z the device id: for PATA, there is usually 2 devices [0,1],
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only 1 for SATA.
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class
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Device class. Can be "ata" for disk, "atapi" for packet device,
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"pmp" for PM, or "none" if no device was found behind the link.
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dma_mode
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Behind each link, up to two ata devices are created.
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The name of the directory is devX[.Y].Z where:
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- X is ata_port_id of the port where the device is connected,
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- Y the port of the PM if any, and
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- Z the device id: for PATA, there is usually 2 devices [0,1], only 1 for SATA.
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What: /sys/class/ata_device/devX[.Y].Z/spdn_cnt
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What: /sys/class/ata_device/devX[.Y].Z/gscr
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What: /sys/class/ata_device/devX[.Y].Z/ering
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What: /sys/class/ata_device/devX[.Y].Z/id
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What: /sys/class/ata_device/devX[.Y].Z/pio_mode
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What: /sys/class/ata_device/devX[.Y].Z/xfer_mode
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What: /sys/class/ata_device/devX[.Y].Z/dma_mode
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What: /sys/class/ata_device/devX[.Y].Z/class
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Date: May, 2010
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KernelVersion: v2.6.37
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Contact: Gwendal Grignou <[email protected]>
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Description:
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spdn_cnt: (RO) Number of times libata decided to lower the
87+
speed of link due to errors.
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Transfer modes supported by the device when in DMA mode.
63-
Mostly used by PATA device.
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gscr: (RO) Cached result of the dump of PM GSCR
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register. Valid registers are:
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65-
pio_mode
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0: SATA_PMP_GSCR_PROD_ID,
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1: SATA_PMP_GSCR_REV,
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2: SATA_PMP_GSCR_PORT_INFO,
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32: SATA_PMP_GSCR_ERROR,
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33: SATA_PMP_GSCR_ERROR_EN,
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64: SATA_PMP_GSCR_FEAT,
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96: SATA_PMP_GSCR_FEAT_EN,
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130: SATA_PMP_GSCR_SII_GPIO
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Transfer modes supported by the device when in PIO mode.
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Mostly used by PATA device.
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Only valid if the device is a PM.
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xfer_mode
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ering: (RO) Formatted output of the error ring of the
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device.
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Current transfer mode.
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id: (RO) Cached result of IDENTIFY command, as
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described in ATA8 7.16 and 7.17. Only valid if
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the device is not a PM.
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id
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pio_mode: (RO) Transfer modes supported by the device when
111+
in PIO mode. Mostly used by PATA device.
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Cached result of IDENTIFY command, as described in ATA8 7.16 and 7.17.
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Only valid if the device is not a PM.
113+
xfer_mode: (RO) Current transfer mode
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79-
gscr
115+
dma_mode: (RO) Transfer modes supported by the device when
116+
in DMA mode. Mostly used by PATA device.
80117

81-
Cached result of the dump of PM GSCR register.
82-
Valid registers are:
83-
0: SATA_PMP_GSCR_PROD_ID,
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1: SATA_PMP_GSCR_REV,
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2: SATA_PMP_GSCR_PORT_INFO,
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32: SATA_PMP_GSCR_ERROR,
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33: SATA_PMP_GSCR_ERROR_EN,
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64: SATA_PMP_GSCR_FEAT,
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96: SATA_PMP_GSCR_FEAT_EN,
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130: SATA_PMP_GSCR_SII_GPIO
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Only valid if the device is a PM.
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class: (RO) Device class. Can be "ata" for disk,
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"atapi" for packet device, "pmp" for PM, or
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"none" if no device was found behind the link.
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93-
trim
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95-
Shows the DSM TRIM mode currently used by the device. Valid
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values are:
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unsupported: Drive does not support DSM TRIM
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unqueued: Drive supports unqueued DSM TRIM only
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queued: Drive supports queued DSM TRIM
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forced_unqueued: Drive's queued DSM support is known to be
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buggy and only unqueued TRIM commands
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are sent
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What: /sys/class/ata_device/devX[.Y].Z/trim
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Date: May, 2015
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KernelVersion: v4.10
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Contact: Gwendal Grignou <[email protected]>
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Description:
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(RO) Shows the DSM TRIM mode currently used by the device. Valid
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values are:
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spdn_cnt
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unsupported: Drive does not support DSM TRIM
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Number of time libata decided to lower the speed of link due to errors.
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unqueued: Drive supports unqueued DSM TRIM only
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ering
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queued: Drive supports queued DSM TRIM
109136

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Formatted output of the error ring of the device.
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forced_unqueued: Drive's queued DSM support is known to
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be buggy and only unqueued TRIM commands
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are sent

‎Documentation/ABI/testing/sysfs-block-device

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What: /sys/block/*/device/sw_activity
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Date: Jun, 2008
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KernelVersion: v2.6.27
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Contact: [email protected]
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Description:
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(RW) Used by drivers which support software controlled activity
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LEDs.
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It has the following valid values:
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0 OFF - the LED is not activated on activity
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1 BLINK_ON - the LED blinks on every 10ms when activity is
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detected.
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2 BLINK_OFF - the LED is on when idle, and blinks off
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every 10ms when activity is detected.
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Note that the user must turn sw_activity OFF it they wish to
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control the activity LED via the em_message file.
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What: /sys/block/*/device/unload_heads
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Date: Sep, 2008
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KernelVersion: v2.6.28
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Contact: [email protected]
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Description:
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(RW) Hard disk shock protection
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Writing an integer value to this file will take the heads of the
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respective drive off the platter and block all I/O operations
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for the specified number of milliseconds.
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- If the device does not support the unload heads feature,
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access is denied with -EOPNOTSUPP.
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- The maximal value accepted for a timeout is 30000
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milliseconds.
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- A previously set timeout can be cancelled and disk can resume
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normal operation immediately by specifying a timeout of 0.
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- Some hard drives only comply with an earlier version of the
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ATA standard, but support the unload feature nonetheless.
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There is no safe way Linux can detect these devices, so this
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is not enabled by default. If it is known that your device
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does support the unload feature, then you can tell the kernel
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to enable it by writing -1. It can be disabled again by
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writing -2.
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- Values below -2 are rejected with -EINVAL
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For more information, see
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Documentation/laptops/disk-shock-protection.txt
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50+
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What: /sys/block/*/device/ncq_prio_enable
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Date: Oct, 2016
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KernelVersion: v4.10
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Contact: [email protected]
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Description:
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(RW) Write to the file to turn on or off the SATA ncq (native
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command queueing) support. By default this feature is turned
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off.

‎Documentation/ABI/testing/sysfs-class-scsi_host

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@@ -27,3 +27,92 @@ Description: This file contains the current status of the "SSD Smart Path"
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the direct i/o path to physical devices. This setting is
2828
controller wide, affecting all configured logical drives on the
2929
controller. This file is readable and writable.
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What: /sys/class/scsi_host/hostX/link_power_management_policy
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Date: Oct, 2007
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KernelVersion: v2.6.24
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Contact: [email protected]
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Description:
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(RW) This parameter allows the user to read and set the link
37+
(interface) power management.
38+
39+
There are four possible options:
40+
41+
min_power: Tell the controller to try to make the link use the
42+
least possible power when possible. This may sacrifice some
43+
performance due to increased latency when coming out of lower
44+
power states.
45+
46+
max_performance: Generally, this means no power management.
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Tell the controller to have performance be a priority over power
48+
management.
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medium_power: Tell the controller to enter a lower power state
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when possible, but do not enter the lowest power state, thus
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improving latency over min_power setting.
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med_power_with_dipm: Identical to the existing medium_power
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setting except that it enables dipm (device initiated power
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management) on top, which makes it match the Windows IRST (Intel
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Rapid Storage Technology) driver settings. This setting is also
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close to min_power, except that:
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a) It does not use host-initiated slumber mode, but it does
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allow device-initiated slumber
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b) It does not enable low power device sleep mode (DevSlp).
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What: /sys/class/scsi_host/hostX/em_message
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What: /sys/class/scsi_host/hostX/em_message_type
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Date: Jun, 2008
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KernelVersion: v2.6.27
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Contact: [email protected]
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Description:
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em_message: (RW) Enclosure management support. For the LED
70+
protocol, writes and reads correspond to the LED message format
71+
as defined in the AHCI spec.
72+
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The user must turn sw_activity (under /sys/block/*/device/) OFF
74+
it they wish to control the activity LED via the em_message
75+
file.
76+
77+
em_message_type: (RO) Displays the current enclosure management
78+
protocol that is being used by the driver (for eg. LED, SAF-TE,
79+
SES-2, SGPIO etc).
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What: /sys/class/scsi_host/hostX/ahci_port_cmd
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What: /sys/class/scsi_host/hostX/ahci_host_caps
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What: /sys/class/scsi_host/hostX/ahci_host_cap2
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Date: Mar, 2010
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KernelVersion: v2.6.35
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Contact: [email protected]
87+
Description:
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[to be documented]
89+
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What: /sys/class/scsi_host/hostX/ahci_host_version
91+
Date: Mar, 2010
92+
KernelVersion: v2.6.35
93+
Contact: [email protected]
94+
Description:
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(RO) Display the version of the AHCI spec implemented by the
96+
host.
97+
98+
What: /sys/class/scsi_host/hostX/em_buffer
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Date: Apr, 2010
100+
KernelVersion: v2.6.35
101+
Contact: [email protected]
102+
Description:
103+
(RW) Allows access to AHCI EM (enclosure management) buffer
104+
directly if the host supports EM.
105+
106+
For eg. the AHCI driver supports SGPIO EM messages but the
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SATA/AHCI specs do not define the SGPIO message format of the EM
108+
buffer. Different hardware(HW) vendors may have different
109+
definitions. With the em_buffer attribute, this issue can be
110+
solved by allowing HW vendors to provide userland drivers and
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tools for their SGPIO initiators.
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What: /sys/class/scsi_host/hostX/em_message_supported
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Date: Oct, 2009
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KernelVersion: v2.6.39
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Contact: [email protected]
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Description:
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(RO) Displays supported enclosure management message types.

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