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Linux/Documentation/dcdbas.txt

  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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