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marcus.erl |
Overview
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The Dell Systems Management Base Driver provides a sysfs interface for
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systems management software such as Dell OpenManage to perform system
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management interrupts and host control actions (system power cycle or
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power off after OS shutdown) on certain Dell systems.
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Dell OpenManage requires this driver on the following Dell PowerEdge systems:
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300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
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700, and 750. Other Dell software such as the open source libsmbios project
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is expected to make use of this driver, and it may include the use of this
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driver on other Dell systems.
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The Dell libsmbios project aims towards providing access to as much BIOS
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information as possible. See http://linux.dell.com/libsmbios/main/ for
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more information about the libsmbios project.
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System Management Interrupt
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On some Dell systems, systems management software must access certain
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management information via a system management interrupt (SMI). The SMI data
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buffer must reside in 32-bit address space, and the physical address of the
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buffer is required for the SMI. The driver maintains the memory required for
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the SMI and provides a way for the application to generate the SMI.
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The driver creates the following sysfs entries for systems management
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software to perform these system management interrupts:
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/sys/devices/platform/dcdbas/smi_data
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/sys/devices/platform/dcdbas/smi_data_buf_phys_addr
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/sys/devices/platform/dcdbas/smi_data_buf_size
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/sys/devices/platform/dcdbas/smi_request
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Systems management software must perform the following steps to execute
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a SMI using this driver:
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1) Lock smi_data.
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2) Write system management command to smi_data.
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3) Write "1" to smi_request to generate a calling interface SMI or
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"2" to generate a raw SMI.
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4) Read system management command response from smi_data.
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5) Unlock smi_data.
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Host Control Action
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Dell OpenManage supports a host control feature that allows the administrator
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to perform a power cycle or power off of the system after the OS has finished
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shutting down. On some Dell systems, this host control feature requires that
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a driver perform a SMI after the OS has finished shutting down.
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The driver creates the following sysfs entries for systems management software
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to schedule the driver to perform a power cycle or power off host control
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action after the system has finished shutting down:
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/sys/devices/platform/dcdbas/host_control_action
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/sys/devices/platform/dcdbas/host_control_smi_type
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/sys/devices/platform/dcdbas/host_control_on_shutdown
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Dell OpenManage performs the following steps to execute a power cycle or
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power off host control action using this driver:
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1) Write host control action to be performed to host_control_action.
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2) Write type of SMI that driver needs to perform to host_control_smi_type.
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3) Write "1" to host_control_on_shutdown to enable host control action.
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4) Initiate OS shutdown.
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(Driver will perform host control SMI when it is notified that the OS
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has finished shutting down.)
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Host Control SMI Type
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The following table shows the value to write to host_control_smi_type to
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perform a power cycle or power off host control action:
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PowerEdge System Host Control SMI Type
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---------------- ---------------------
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300 HC_SMITYPE_TYPE1
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1300 HC_SMITYPE_TYPE1
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1400 HC_SMITYPE_TYPE2
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500SC HC_SMITYPE_TYPE2
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1500SC HC_SMITYPE_TYPE2
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1550 HC_SMITYPE_TYPE2
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600SC HC_SMITYPE_TYPE2
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1600SC HC_SMITYPE_TYPE2
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650 HC_SMITYPE_TYPE2
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1655MC HC_SMITYPE_TYPE2
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700 HC_SMITYPE_TYPE3
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750 HC_SMITYPE_TYPE3
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