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Documentation / dcdbas.txt




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Based on kernel version 3.13. Page generated on 2014-01-20 22:00 EST.

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	
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