| 1 | ===================================
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| 2 | Dell Systems Management Base Driver
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| 3 | ===================================
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| 4 |
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| 5 | Overview
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| 6 | ========
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| 7 |
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| 8 | The Dell Systems Management Base Driver provides a sysfs interface for
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| 9 | systems management software such as Dell OpenManage to perform system
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| 10 | management interrupts and host control actions (system power cycle or
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| 11 | power off after OS shutdown) on certain Dell systems.
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| 12 |
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| 13 | Dell OpenManage requires this driver on the following Dell PowerEdge systems:
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| 14 | 300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
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| 15 | 700, and 750. Other Dell software such as the open source libsmbios project
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| 16 | is expected to make use of this driver, and it may include the use of this
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| 17 | driver on other Dell systems.
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| 18 |
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| 19 | The Dell libsmbios project aims towards providing access to as much BIOS
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| 20 | information as possible. See http://linux.dell.com/libsmbios/main/ for
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| 21 | more information about the libsmbios project.
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| 22 |
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| 23 |
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| 24 | System Management Interrupt
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| 25 | ===========================
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| 26 |
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| 27 | On some Dell systems, systems management software must access certain
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| 28 | management information via a system management interrupt (SMI). The SMI data
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| 29 | buffer must reside in 32-bit address space, and the physical address of the
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| 30 | buffer is required for the SMI. The driver maintains the memory required for
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| 31 | the SMI and provides a way for the application to generate the SMI.
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| 32 | The driver creates the following sysfs entries for systems management
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| 33 | software to perform these system management interrupts::
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| 34 |
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| 35 | /sys/devices/platform/dcdbas/smi_data
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| 36 | /sys/devices/platform/dcdbas/smi_data_buf_phys_addr
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| 37 | /sys/devices/platform/dcdbas/smi_data_buf_size
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| 38 | /sys/devices/platform/dcdbas/smi_request
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| 39 |
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| 40 | Systems management software must perform the following steps to execute
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| 41 | a SMI using this driver:
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| 42 |
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| 43 | 1) Lock smi_data.
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| 44 | 2) Write system management command to smi_data.
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| 45 | 3) Write "1" to smi_request to generate a calling interface SMI or
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| 46 | "2" to generate a raw SMI.
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| 47 | 4) Read system management command response from smi_data.
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| 48 | 5) Unlock smi_data.
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| 49 |
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| 50 |
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| 51 | Host Control Action
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| 52 | ===================
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| 53 |
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| 54 | Dell OpenManage supports a host control feature that allows the administrator
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| 55 | to perform a power cycle or power off of the system after the OS has finished
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| 56 | shutting down. On some Dell systems, this host control feature requires that
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| 57 | a driver perform a SMI after the OS has finished shutting down.
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| 58 |
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| 59 | The driver creates the following sysfs entries for systems management software
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| 60 | to schedule the driver to perform a power cycle or power off host control
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| 61 | action after the system has finished shutting down:
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| 62 |
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| 63 | /sys/devices/platform/dcdbas/host_control_action
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| 64 | /sys/devices/platform/dcdbas/host_control_smi_type
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| 65 | /sys/devices/platform/dcdbas/host_control_on_shutdown
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| 66 |
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| 67 | Dell OpenManage performs the following steps to execute a power cycle or
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| 68 | power off host control action using this driver:
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| 69 |
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| 70 | 1) Write host control action to be performed to host_control_action.
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| 71 | 2) Write type of SMI that driver needs to perform to host_control_smi_type.
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| 72 | 3) Write "1" to host_control_on_shutdown to enable host control action.
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| 73 | 4) Initiate OS shutdown.
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| 74 | (Driver will perform host control SMI when it is notified that the OS
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| 75 | has finished shutting down.)
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| 76 |
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| 77 |
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| 78 | Host Control SMI Type
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| 79 | =====================
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| 80 |
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| 81 | The following table shows the value to write to host_control_smi_type to
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| 82 | perform a power cycle or power off host control action:
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| 83 |
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| 84 | =================== =====================
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| 85 | PowerEdge System Host Control SMI Type
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| 86 | =================== =====================
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| 87 | 300 HC_SMITYPE_TYPE1
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| 88 | 1300 HC_SMITYPE_TYPE1
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| 89 | 1400 HC_SMITYPE_TYPE2
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| 90 | 500SC HC_SMITYPE_TYPE2
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| 91 | 1500SC HC_SMITYPE_TYPE2
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| 92 | 1550 HC_SMITYPE_TYPE2
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| 93 | 600SC HC_SMITYPE_TYPE2
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| 94 | 1600SC HC_SMITYPE_TYPE2
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| 95 | 650 HC_SMITYPE_TYPE2
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| 96 | 1655MC HC_SMITYPE_TYPE2
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| 97 | 700 HC_SMITYPE_TYPE3
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| 98 | 750 HC_SMITYPE_TYPE3
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| 99 | =================== =====================
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