0001 ===================================
0002 Dell Systems Management Base Driver
0003 ===================================
0004
0005 Overview
0006 ========
0007
0008 The Dell Systems Management Base Driver provides a sysfs interface for
0009 systems management software such as Dell OpenManage to perform system
0010 management interrupts and host control actions (system power cycle or
0011 power off after OS shutdown) on certain Dell systems.
0012
0013 Dell OpenManage requires this driver on the following Dell PowerEdge systems:
0014 300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
0015 700, and 750. Other Dell software such as the open source libsmbios project
0016 is expected to make use of this driver, and it may include the use of this
0017 driver on other Dell systems.
0018
0019 The Dell libsmbios project aims towards providing access to as much BIOS
0020 information as possible. See http://linux.dell.com/libsmbios/main/ for
0021 more information about the libsmbios project.
0022
0023
0024 System Management Interrupt
0025 ===========================
0026
0027 On some Dell systems, systems management software must access certain
0028 management information via a system management interrupt (SMI). The SMI data
0029 buffer must reside in 32-bit address space, and the physical address of the
0030 buffer is required for the SMI. The driver maintains the memory required for
0031 the SMI and provides a way for the application to generate the SMI.
0032 The driver creates the following sysfs entries for systems management
0033 software to perform these system management interrupts::
0034
0035 /sys/devices/platform/dcdbas/smi_data
0036 /sys/devices/platform/dcdbas/smi_data_buf_phys_addr
0037 /sys/devices/platform/dcdbas/smi_data_buf_size
0038 /sys/devices/platform/dcdbas/smi_request
0039
0040 Systems management software must perform the following steps to execute
0041 a SMI using this driver:
0042
0043 1) Lock smi_data.
0044 2) Write system management command to smi_data.
0045 3) Write "1" to smi_request to generate a calling interface SMI or
0046 "2" to generate a raw SMI.
0047 4) Read system management command response from smi_data.
0048 5) Unlock smi_data.
0049
0050
0051 Host Control Action
0052 ===================
0053
0054 Dell OpenManage supports a host control feature that allows the administrator
0055 to perform a power cycle or power off of the system after the OS has finished
0056 shutting down. On some Dell systems, this host control feature requires that
0057 a driver perform a SMI after the OS has finished shutting down.
0058
0059 The driver creates the following sysfs entries for systems management software
0060 to schedule the driver to perform a power cycle or power off host control
0061 action after the system has finished shutting down:
0062
0063 /sys/devices/platform/dcdbas/host_control_action
0064 /sys/devices/platform/dcdbas/host_control_smi_type
0065 /sys/devices/platform/dcdbas/host_control_on_shutdown
0066
0067 Dell OpenManage performs the following steps to execute a power cycle or
0068 power off host control action using this driver:
0069
0070 1) Write host control action to be performed to host_control_action.
0071 2) Write type of SMI that driver needs to perform to host_control_smi_type.
0072 3) Write "1" to host_control_on_shutdown to enable host control action.
0073 4) Initiate OS shutdown.
0074 (Driver will perform host control SMI when it is notified that the OS
0075 has finished shutting down.)
0076
0077
0078 Host Control SMI Type
0079 =====================
0080
0081 The following table shows the value to write to host_control_smi_type to
0082 perform a power cycle or power off host control action:
0083
0084 =================== =====================
0085 PowerEdge System Host Control SMI Type
0086 =================== =====================
0087 300 HC_SMITYPE_TYPE1
0088 1300 HC_SMITYPE_TYPE1
0089 1400 HC_SMITYPE_TYPE2
0090 500SC HC_SMITYPE_TYPE2
0091 1500SC HC_SMITYPE_TYPE2
0092 1550 HC_SMITYPE_TYPE2
0093 600SC HC_SMITYPE_TYPE2
0094 1600SC HC_SMITYPE_TYPE2
0095 650 HC_SMITYPE_TYPE2
0096 1655MC HC_SMITYPE_TYPE2
0097 700 HC_SMITYPE_TYPE3
0098 750 HC_SMITYPE_TYPE3
0099 =================== =====================
