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- What: /sys/class/ata_*
- Description:
- Provide a place in sysfs for storing the ATA topology of the
- system. This allows retrieving various information about ATA
- objects.
- Files under /sys/class/ata_port
- -------------------------------
- For each port, a directory ataX is created where X is the ata_port_id of the
- port. The device parent is the ata host device.
- What: /sys/class/ata_port/ataX/nr_pmp_links
- What: /sys/class/ata_port/ataX/idle_irq
- Date: May, 2010
- KernelVersion: v2.6.37
- Contact: Gwendal Grignou <[email protected]>
- Description:
- nr_pmp_links: (RO) If a SATA Port Multiplier (PM) is
- connected, the number of links behind it.
- idle_irq: (RO) Number of IRQ received by the port while
- idle [some ata HBA only].
- What: /sys/class/ata_port/ataX/port_no
- Date: May, 2013
- KernelVersion: v3.11
- Contact: Gwendal Grignou <[email protected]>
- Description:
- (RO) Host local port number. While registering host controller,
- port numbers are tracked based upon number of ports available on
- the controller. This attribute is needed by udev for composing
- persistent links in /dev/disk/by-path.
- Files under /sys/class/ata_link
- -------------------------------
- Behind each port, there is a ata_link. If there is a SATA PM in the topology, 15
- ata_link objects are created.
- If a link is behind a port, the directory name is linkX, where X is ata_port_id
- of the port. If a link is behind a PM, its name is linkX.Y where X is
- ata_port_id of the parent port and Y the PM port.
- What: /sys/class/ata_link/linkX[.Y]/hw_sata_spd_limit
- What: /sys/class/ata_link/linkX[.Y]/sata_spd_limit
- What: /sys/class/ata_link/linkX[.Y]/sata_spd
- Date: May, 2010
- KernelVersion: v2.6.37
- Contact: Gwendal Grignou <[email protected]>
- Description:
- hw_sata_spd_limit: (RO) Maximum speed supported by the
- connected SATA device.
- sata_spd_limit: (RO) Maximum speed imposed by libata.
- sata_spd: (RO) Current speed of the link
- eg. 1.5, 3 Gbps etc.
- Files under /sys/class/ata_device
- ---------------------------------
- Behind each link, up to two ata devices are created.
- The name of the directory is devX[.Y].Z where:
- - X is ata_port_id of the port where the device is connected,
- - Y the port of the PM if any, and
- - Z the device id: for PATA, there is usually 2 devices [0,1], only 1 for SATA.
- What: /sys/class/ata_device/devX[.Y].Z/spdn_cnt
- What: /sys/class/ata_device/devX[.Y].Z/gscr
- What: /sys/class/ata_device/devX[.Y].Z/ering
- What: /sys/class/ata_device/devX[.Y].Z/id
- What: /sys/class/ata_device/devX[.Y].Z/pio_mode
- What: /sys/class/ata_device/devX[.Y].Z/xfer_mode
- What: /sys/class/ata_device/devX[.Y].Z/dma_mode
- What: /sys/class/ata_device/devX[.Y].Z/class
- Date: May, 2010
- KernelVersion: v2.6.37
- Contact: Gwendal Grignou <[email protected]>
- Description:
- spdn_cnt: (RO) Number of times libata decided to lower the
- speed of link due to errors.
- gscr: (RO) Cached result of the dump of PM GSCR
- register. Valid registers are:
- 0: SATA_PMP_GSCR_PROD_ID,
- 1: SATA_PMP_GSCR_REV,
- 2: SATA_PMP_GSCR_PORT_INFO,
- 32: SATA_PMP_GSCR_ERROR,
- 33: SATA_PMP_GSCR_ERROR_EN,
- 64: SATA_PMP_GSCR_FEAT,
- 96: SATA_PMP_GSCR_FEAT_EN,
- 130: SATA_PMP_GSCR_SII_GPIO
- Only valid if the device is a PM.
- ering: (RO) Formatted output of the error ring of the
- device.
- id: (RO) Cached result of IDENTIFY command, as
- described in ATA8 7.16 and 7.17. Only valid if
- the device is not a PM.
- pio_mode: (RO) PIO transfer mode used by the device.
- Mostly used by PATA devices.
- xfer_mode: (RO) Current transfer mode. Mostly used by
- PATA devices.
- dma_mode: (RO) DMA transfer mode used by the device.
- Mostly used by PATA devices.
- class: (RO) Device class. Can be "ata" for disk,
- "atapi" for packet device, "pmp" for PM, or
- "none" if no device was found behind the link.
- What: /sys/class/ata_device/devX[.Y].Z/trim
- Date: May, 2015
- KernelVersion: v4.10
- Contact: Gwendal Grignou <[email protected]>
- Description:
- (RO) Shows the DSM TRIM mode currently used by the device. Valid
- values are:
- unsupported: Drive does not support DSM TRIM
- unqueued: Drive supports unqueued DSM TRIM only
- queued: Drive supports queued DSM TRIM
- forced_unqueued: Drive's queued DSM support is known to
- be buggy and only unqueued TRIM commands
- are sent
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