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2005-09-06 [PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs su…
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
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