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-What: /sys/class/ata_...
-Date: August 2008
-Contact: Gwendal Grignou<gwendal@google.com>
-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.
-
-idle_irq (read)
-
- Number of IRQ received by the port while idle [some ata HBA only].
-
-nr_pmp_links (read)
-
- If a SATA Port Multiplier (PM) is connected, number of link behind it.
-
-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.
-
-hw_sata_spd_limit
-
- Maximum speed supported by the connected SATA device.
-
-sata_spd_limit
-
- Maximum speed imposed by libata.
-
-sata_spd
-
- Current speed of the link [1.5, 3Gps,...].
-
-Files under /sys/class/ata_device
----------------------------------
-
- Behind each link, up to two ata device 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.
-
-class
- Device class. Can be "ata" for disk, "atapi" for packet device,
- "pmp" for PM, or "none" if no device was found behind the link.
-
-dma_mode
-
- Transfer modes supported by the device when in DMA mode.
- Mostly used by PATA device.
-
-pio_mode
-
- Transfer modes supported by the device when in PIO mode.
- Mostly used by PATA device.
-
-xfer_mode
-
- Current transfer mode.
-
-id
-
- Cached result of IDENTIFY command, as described in ATA8 7.16 and 7.17.
- Only valid if the device is not a PM.
-
-gscr
-
- 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.
-
-spdn_cnt
-
- Number of time libata decided to lower the speed of link due to errors.
-
-ering
-
- Formatted output of the error ring of the device.