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Commit | Line | Data |
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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. |