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1 | Overview |
2 | |
3 | The Dell Systems Management Base Driver provides a sysfs interface for |
4 | systems management software such as Dell OpenManage to perform system |
5 | management interrupts and host control actions (system power cycle or |
6 | power off after OS shutdown) on certain Dell systems. |
7 | |
8 | Dell OpenManage requires this driver on the following Dell PowerEdge systems: |
9 | 300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC, |
10 | 700, and 750. Other Dell software such as the open source libsmbios project |
11 | is expected to make use of this driver, and it may include the use of this |
12 | driver on other Dell systems. |
13 | |
14 | The Dell libsmbios project aims towards providing access to as much BIOS |
15 | information as possible. See http://linux.dell.com/libsmbios/main/ for |
16 | more information about the libsmbios project. |
17 | |
18 | |
19 | System Management Interrupt |
20 | |
21 | On some Dell systems, systems management software must access certain |
22 | management information via a system management interrupt (SMI). The SMI data |
23 | buffer must reside in 32-bit address space, and the physical address of the |
24 | buffer is required for the SMI. The driver maintains the memory required for |
25 | the SMI and provides a way for the application to generate the SMI. |
26 | The driver creates the following sysfs entries for systems management |
27 | software to perform these system management interrupts: |
28 | |
29 | /sys/devices/platform/dcdbas/smi_data |
30 | /sys/devices/platform/dcdbas/smi_data_buf_phys_addr |
31 | /sys/devices/platform/dcdbas/smi_data_buf_size |
32 | /sys/devices/platform/dcdbas/smi_request |
33 | |
34 | Systems management software must perform the following steps to execute |
35 | a SMI using this driver: |
36 | |
37 | 1) Lock smi_data. |
38 | 2) Write system management command to smi_data. |
39 | 3) Write "1" to smi_request to generate a calling interface SMI or |
40 | "2" to generate a raw SMI. |
41 | 4) Read system management command response from smi_data. |
42 | 5) Unlock smi_data. |
43 | |
44 | |
45 | Host Control Action |
46 | |
47 | Dell OpenManage supports a host control feature that allows the administrator |
48 | to perform a power cycle or power off of the system after the OS has finished |
49 | shutting down. On some Dell systems, this host control feature requires that |
50 | a driver perform a SMI after the OS has finished shutting down. |
51 | |
52 | The driver creates the following sysfs entries for systems management software |
53 | to schedule the driver to perform a power cycle or power off host control |
54 | action after the system has finished shutting down: |
55 | |
56 | /sys/devices/platform/dcdbas/host_control_action |
57 | /sys/devices/platform/dcdbas/host_control_smi_type |
58 | /sys/devices/platform/dcdbas/host_control_on_shutdown |
59 | |
60 | Dell OpenManage performs the following steps to execute a power cycle or |
61 | power off host control action using this driver: |
62 | |
63 | 1) Write host control action to be performed to host_control_action. |
64 | 2) Write type of SMI that driver needs to perform to host_control_smi_type. |
65 | 3) Write "1" to host_control_on_shutdown to enable host control action. |
66 | 4) Initiate OS shutdown. |
67 | (Driver will perform host control SMI when it is notified that the OS |
68 | has finished shutting down.) |
69 | |
70 | |
71 | Host Control SMI Type |
72 | |
73 | The following table shows the value to write to host_control_smi_type to |
74 | perform a power cycle or power off host control action: |
75 | |
76 | PowerEdge System Host Control SMI Type |
77 | ---------------- --------------------- |
78 | 300 HC_SMITYPE_TYPE1 |
79 | 1300 HC_SMITYPE_TYPE1 |
80 | 1400 HC_SMITYPE_TYPE2 |
81 | 500SC HC_SMITYPE_TYPE2 |
82 | 1500SC HC_SMITYPE_TYPE2 |
83 | 1550 HC_SMITYPE_TYPE2 |
84 | 600SC HC_SMITYPE_TYPE2 |
85 | 1600SC HC_SMITYPE_TYPE2 |
86 | 650 HC_SMITYPE_TYPE2 |
87 | 1655MC HC_SMITYPE_TYPE2 |
88 | 700 HC_SMITYPE_TYPE3 |
89 | 750 HC_SMITYPE_TYPE3 |
90 | |
91 | |
92 |
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