94ac2a94b7
commit 72aad489f992871e908ff6d9055b26c6366fb864 upstream.
The {dma|pio}_mode sysfs files are incorrectly documented as having a
list of the supported DMA/PIO transfer modes, while the corresponding
fields of the *struct* ata_device hold the transfer mode IDs, not masks.
To match these docs, the {dma|pio}_mode (and even xfer_mode!) sysfs
files are handled by the ata_bitfield_name_match() macro which leads to
reading such kind of nonsense from them:
$ cat /sys/class/ata_device/dev3.0/pio_mode
XFER_UDMA_7, XFER_UDMA_6, XFER_UDMA_5, XFER_UDMA_4, XFER_MW_DMA_4,
XFER_PIO_6, XFER_PIO_5, XFER_PIO_4, XFER_PIO_3, XFER_PIO_2, XFER_PIO_1,
XFER_PIO_0
Using the correct ata_bitfield_name_search() macro fixes that:
$ cat /sys/class/ata_device/dev3.0/pio_mode
XFER_PIO_4
While fixing the file documentation, somewhat reword the {dma|pio}_mode
file doc and add a note about being mostly useful for PATA devices to
the xfer_mode file doc...
Fixes: d9027470b8 ("[libata] Add ATA transport class")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
2.7 KiB
Plaintext
112 lines
2.7 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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DMA transfer mode used by the device.
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Mostly used by PATA device.
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pio_mode
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PIO transfer mode used by the device.
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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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Mostly used by PATA device.
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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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trim
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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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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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