projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d9027470 GG |
1 | What: /sys/class/ata_... |
| 2 | Date: August 2008 | |
| 3 | Contact: Gwendal Grignou<gwendal@google.com> | |
| 4 | Description: | |
| 5 | ||
| 6 | Provide a place in sysfs for storing the ATA topology of the system. This allows | |
| 7 | retrieving various information about ATA objects. | |
| 8 | ||
| 9 | Files under /sys/class/ata_port | |
| 10 | ------------------------------- | |
| 11 | ||
| 12 | For each port, a directory ataX is created where X is the ata_port_id of | |
| 13 | the port. The device parent is the ata host device. | |
| 14 | ||
| 15 | idle_irq (read) | |
| 16 | ||
| 17 | Number of IRQ received by the port while idle [some ata HBA only]. | |
| 18 | ||
| 19 | nr_pmp_links (read) | |
| 20 | ||
| 21 | If a SATA Port Multiplier (PM) is connected, number of link behind it. | |
| 22 | ||
| 23 | Files under /sys/class/ata_link | |
| 24 | ------------------------------- | |
| 25 | ||
| 26 | Behind each port, there is a ata_link. If there is a SATA PM in the | |
| 27 | topology, 15 ata_link objects are created. | |
| 28 | ||
| 29 | If a link is behind a port, the directory name is linkX, where X is | |
| 30 | ata_port_id of the port. | |
| 31 | If a link is behind a PM, its name is linkX.Y where X is ata_port_id | |
| 32 | of the parent port and Y the PM port. | |
| 33 | ||
| 34 | hw_sata_spd_limit | |
| 35 | ||
| 36 | Maximum speed supported by the connected SATA device. | |
| 37 | ||
| 38 | sata_spd_limit | |
| 39 | ||
| 40 | Maximum speed imposed by libata. | |
| 41 | ||
| 42 | sata_spd | |
| 43 | ||
| 44 | Current speed of the link [1.5, 3Gps,...]. | |
| 45 | ||
| 46 | Files under /sys/class/ata_device | |
| 47 | --------------------------------- | |
| 48 | ||
| 49 | Behind each link, up to two ata device are created. | |
| 50 | The name of the directory is devX[.Y].Z where: | |
| 51 | - X is ata_port_id of the port where the device is connected, | |
| 52 | - Y the port of the PM if any, and | |
| 53 | - Z the device id: for PATA, there is usually 2 devices [0,1], | |
| 54 | only 1 for SATA. | |
| 55 | ||
| 56 | class | |
| 57 | Device class. Can be "ata" for disk, "atapi" for packet device, | |
| 58 | "pmp" for PM, or "none" if no device was found behind the link. | |
| 59 | ||
| 60 | dma_mode | |
| 61 | ||
| 62 | Transfer modes supported by the device when in DMA mode. | |
| 63 | Mostly used by PATA device. | |
| 64 | ||
| 65 | pio_mode | |
| 66 | ||
| 67 | Transfer modes supported by the device when in PIO mode. | |
| 68 | Mostly used by PATA device. | |
| 69 | ||
| 70 | xfer_mode | |
| 71 | ||
| 72 | Current transfer mode. | |
| 73 | ||
| 74 | id | |
| 75 | ||
| 76 | Cached result of IDENTIFY command, as described in ATA8 7.16 and 7.17. | |
| 77 | Only valid if the device is not a PM. | |
| 78 | ||
| 79 | gscr | |
| 80 | ||
| 81 | Cached result of the dump of PM GSCR register. | |
| 82 | Valid registers are: | |
| 83 | 0: SATA_PMP_GSCR_PROD_ID, | |
| 84 | 1: SATA_PMP_GSCR_REV, | |
| 85 | 2: SATA_PMP_GSCR_PORT_INFO, | |
| 86 | 32: SATA_PMP_GSCR_ERROR, | |
| 87 | 33: SATA_PMP_GSCR_ERROR_EN, | |
| 88 | 64: SATA_PMP_GSCR_FEAT, | |
| 89 | 96: SATA_PMP_GSCR_FEAT_EN, | |
| 90 | 130: SATA_PMP_GSCR_SII_GPIO | |
| 91 | Only valid if the device is a PM. | |
| 92 | ||
| f3030741 MP |
93 | trim |
| 94 | ||
| 95 | Shows the DSM TRIM mode currently used by the device. Valid | |
| 96 | values are: | |
| 97 | unsupported: Drive does not support DSM TRIM | |
| 98 | unqueued: Drive supports unqueued DSM TRIM only | |
| 99 | queued: Drive supports queued DSM TRIM | |
| 4b9d64ee | 100 | forced_unqueued: Drive's queued DSM support is known to be |
| f3030741 MP |
101 | buggy and only unqueued TRIM commands |
| 102 | are sent | |
| 103 | ||
| d9027470 GG |
104 | spdn_cnt |
| 105 | ||
| 106 | Number of time libata decided to lower the speed of link due to errors. | |
| 107 | ||
| 108 | ering | |
| 109 | ||
| 110 | Formatted output of the error ring of the device. |