d9027470b8
This is a scheleton for libata transport class. All information is read only, exporting information from libata: - ata_port class: one per ATA port - ata_link class: one per ATA port or 15 for SATA Port Multiplier - ata_device class: up to 2 for PATA link, usually one for SATA. Signed-off-by: Gwendal Grignou <gwendal@google.com> Reviewed-by: Grant Grundler <grundler@google.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
100 lines
2.4 KiB
Plaintext
100 lines
2.4 KiB
Plaintext
What: /sys/class/ata_...
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Date: August 2008
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Contact: Gwendal Grignou<gwendal@google.com>
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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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Files under /sys/class/ata_port
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-------------------------------
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For each port, a directory ataX is created where X is the ata_port_id of
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the 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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nr_pmp_links (read)
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If a SATA Port Multiplier (PM) is connected, number of link behind it.
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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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hw_sata_spd_limit
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Maximum speed supported by the connected SATA device.
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sata_spd_limit
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Maximum speed imposed by libata.
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sata_spd
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Current speed of the link [1.5, 3Gps,...].
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Files under /sys/class/ata_device
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---------------------------------
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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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Transfer modes supported by the device when in DMA mode.
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Mostly used by PATA device.
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pio_mode
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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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xfer_mode
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Current transfer mode.
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id
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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.
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gscr
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Cached result of the dump of PM GSCR register.
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Valid registers are:
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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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Only valid if the device is a PM.
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spdn_cnt
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Number of time libata decided to lower the speed of link due to errors.
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ering
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Formatted output of the error ring of the device.
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