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What: dv1394 (a.k.a. "OHCI-DV I/O support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/dv1394/* were character device files, one for each FireWire | ||
controller and for NTSC and PAL respectively, from which DV data | ||
could be received by read() or transmitted by write(). A few | ||
ioctl()s allowed limited control. | ||
This special-purpose interface has been superseded by libraw1394 + | ||
libiec61883 which are functionally equivalent, support HDV, and | ||
transparently work on top of the newer firewire kernel drivers. | ||
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Users: | ||
ffmpeg/libavformat (if configured for DV1394) |
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What: raw1394 (a.k.a. "Raw IEEE1394 I/O support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/raw1394 was a character device file that allowed low-level | ||
access to FireWire buses. Its major drawbacks were its inability | ||
to implement sensible device security policies, and its low level | ||
of abstraction that required userspace clients do duplicate much | ||
of the kernel's ieee1394 core functionality. | ||
Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of | ||
firewire-core. | ||
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Users: | ||
libraw1394 (works with firewire-cdev too, transparent to library ABI | ||
users) |
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What: video1394 (a.k.a. "OHCI-1394 Video support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/video1394/* were character device files, one for each FireWire | ||
controller, which were used for isochronous I/O. It was added as an | ||
alternative to raw1394's isochronous I/O functionality which had | ||
performance issues in its first generation. Any video1394 user had | ||
to use raw1394 + libraw1394 too because video1394 did not provide | ||
asynchronous I/O for device discovery and configuration. | ||
Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of | ||
firewire-core. | ||
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Users: | ||
libdc1394 (works with firewire-cdev too, transparent to library ABI | ||
users) |
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What: /sys/class/ata_... | ||
Date: August 2008 | ||
Contact: Gwendal Grignou<gwendal@google.com> | ||
Description: | ||
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Provide a place in sysfs for storing the ATA topology of the system. This allows | ||
retrieving various information about ATA objects. | ||
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Files under /sys/class/ata_port | ||
------------------------------- | ||
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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. | ||
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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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Behind each port, there is a ata_link. If there is a SATA PM in the | ||
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 | ||
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. | ||
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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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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. | ||
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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. | ||
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dma_mode | ||
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Transfer modes supported by the device when in DMA mode. | ||
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. | ||
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. | ||
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. | ||
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. | ||
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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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What: /sys/block/zram<id>/disksize | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is read-write and specifies the disk size | ||
which represents the limit on the *uncompressed* worth of data | ||
that can be stored in this disk. | ||
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What: /sys/block/zram<id>/initstate | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is read-only and shows the initialization | ||
state of the device. | ||
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What: /sys/block/zram<id>/reset | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is write-only and allows resetting the | ||
device. The reset operation frees all the memory assocaited | ||
with this device. | ||
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What: /sys/block/zram<id>/num_reads | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The num_reads file is read-only and specifies the number of | ||
reads (failed or successful) done on this device. | ||
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What: /sys/block/zram<id>/num_writes | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The num_writes file is read-only and specifies the number of | ||
writes (failed or successful) done on this device. | ||
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What: /sys/block/zram<id>/invalid_io | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The invalid_io file is read-only and specifies the number of | ||
non-page-size-aligned I/O requests issued to this device. | ||
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What: /sys/block/zram<id>/notify_free | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The notify_free file is read-only and specifies the number of | ||
swap slot free notifications received by this device. These | ||
notifications are send to a swap block device when a swap slot | ||
is freed. This statistic is applicable only when this disk is | ||
being used as a swap disk. | ||
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What: /sys/block/zram<id>/discard | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The discard file is read-only and specifies the number of | ||
discard requests received by this device. These requests | ||
provide information to block device regarding blocks which are | ||
no longer used by filesystem. | ||
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What: /sys/block/zram<id>/zero_pages | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The zero_pages file is read-only and specifies number of zero | ||
filled pages written to this disk. No memory is allocated for | ||
such pages. | ||
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What: /sys/block/zram<id>/orig_data_size | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The orig_data_size file is read-only and specifies uncompressed | ||
size of data stored in this disk. This excludes zero-filled | ||
pages (zero_pages) since no memory is allocated for them. | ||
Unit: bytes | ||
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What: /sys/block/zram<id>/compr_data_size | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The compr_data_size file is read-only and specifies compressed | ||
size of data stored in this disk. So, compression ratio can be | ||
calculated using orig_data_size and this statistic. | ||
Unit: bytes | ||
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What: /sys/block/zram<id>/mem_used_total | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The mem_used_total file is read-only and specifies the amount | ||
of memory, including allocator fragmentation and metadata | ||
overhead, allocated for this disk. So, allocator space | ||
efficiency can be calculated using compr_data_size and this | ||
statistic. | ||
Unit: bytes |
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What: state | ||
Date: Sep 2010 | ||
KernelVersion: 2.6.37 | ||
Contact: Vernon Mauery <vernux@us.ibm.com> | ||
Description: The state file allows a means by which to change in and | ||
out of Premium Real-Time Mode (PRTM), as well as the | ||
ability to query the current state. | ||
0 => PRTM off | ||
1 => PRTM enabled | ||
Users: The ibm-prtm userspace daemon uses this interface. | ||
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What: version | ||
Date: Sep 2010 | ||
KernelVersion: 2.6.37 | ||
Contact: Vernon Mauery <vernux@us.ibm.com> | ||
Description: The version file provides a means by which to query | ||
the RTL table version that lives in the Extended | ||
BIOS Data Area (EBDA). | ||
Users: The ibm-prtm userspace daemon uses this interface. | ||
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