1=================================== 2Dell Systems Management Base Driver 3=================================== 4 5Overview 6======== 7 8The Dell Systems Management Base Driver provides a sysfs interface for 9systems management software such as Dell OpenManage to perform system 10management interrupts and host control actions (system power cycle or 11power off after OS shutdown) on certain Dell systems. 12 13Dell OpenManage requires this driver on the following Dell PowerEdge systems: 14300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC, 15700, and 750. Other Dell software such as the open source libsmbios project 16is expected to make use of this driver, and it may include the use of this 17driver on other Dell systems. 18 19The Dell libsmbios project aims towards providing access to as much BIOS 20information as possible. See http://linux.dell.com/libsmbios/main/ for 21more information about the libsmbios project. 22 23 24System Management Interrupt 25=========================== 26 27On some Dell systems, systems management software must access certain 28management information via a system management interrupt (SMI). The SMI data 29buffer must reside in 32-bit address space, and the physical address of the 30buffer is required for the SMI. The driver maintains the memory required for 31the SMI and provides a way for the application to generate the SMI. 32The driver creates the following sysfs entries for systems management 33software to perform these system management interrupts:: 34 35 /sys/devices/platform/dcdbas/smi_data 36 /sys/devices/platform/dcdbas/smi_data_buf_phys_addr 37 /sys/devices/platform/dcdbas/smi_data_buf_size 38 /sys/devices/platform/dcdbas/smi_request 39 40Systems management software must perform the following steps to execute 41a SMI using this driver: 42 431) Lock smi_data. 442) Write system management command to smi_data. 453) Write "1" to smi_request to generate a calling interface SMI or 46 "2" to generate a raw SMI. 474) Read system management command response from smi_data. 485) Unlock smi_data. 49 50 51Host Control Action 52=================== 53 54Dell OpenManage supports a host control feature that allows the administrator 55to perform a power cycle or power off of the system after the OS has finished 56shutting down. On some Dell systems, this host control feature requires that 57a driver perform a SMI after the OS has finished shutting down. 58 59The driver creates the following sysfs entries for systems management software 60to schedule the driver to perform a power cycle or power off host control 61action after the system has finished shutting down: 62 63/sys/devices/platform/dcdbas/host_control_action 64/sys/devices/platform/dcdbas/host_control_smi_type 65/sys/devices/platform/dcdbas/host_control_on_shutdown 66 67Dell OpenManage performs the following steps to execute a power cycle or 68power off host control action using this driver: 69 701) Write host control action to be performed to host_control_action. 712) Write type of SMI that driver needs to perform to host_control_smi_type. 723) Write "1" to host_control_on_shutdown to enable host control action. 734) Initiate OS shutdown. 74 (Driver will perform host control SMI when it is notified that the OS 75 has finished shutting down.) 76 77 78Host Control SMI Type 79===================== 80 81The following table shows the value to write to host_control_smi_type to 82perform a power cycle or power off host control action: 83 84=================== ===================== 85PowerEdge System Host Control SMI Type 86=================== ===================== 87 300 HC_SMITYPE_TYPE1 88 1300 HC_SMITYPE_TYPE1 89 1400 HC_SMITYPE_TYPE2 90 500SC HC_SMITYPE_TYPE2 91 1500SC HC_SMITYPE_TYPE2 92 1550 HC_SMITYPE_TYPE2 93 600SC HC_SMITYPE_TYPE2 94 1600SC HC_SMITYPE_TYPE2 95 650 HC_SMITYPE_TYPE2 96 1655MC HC_SMITYPE_TYPE2 97 700 HC_SMITYPE_TYPE3 98 750 HC_SMITYPE_TYPE3 99=================== ===================== 100