BSP Developer's Guide

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VxWorks 5.5 BSP Developer’s Guide This section ends with a brief discussion of how VxWorks typically handles the execution of a SCSI command. I.3.1 SCSI Manager (scsiMgrLib) The SCSI manager functions as a task within VxWorks. There is one SCSI manager per SCSI controller, and it is responsible for managing all SCSI interaction between VxWorks tasks and the SCSI controller. Any number of VxWorks tasks can request services from SCSI peripheral devices. The SCSI bus is a shared critical resource which requires multitasking support and synchronization. For the sake of performance and efficiency, the SCSI manager controls all the SCSI traffic within the operating system. SCSI traffic includes requests for SCSI services by VxWorks tasks. These requests are asynchronous events from the SCSI bus and include SCSI reconnects, SCSI connection timeouts, and SCSI responses to requests by VxWorks tasks. This work flow is managed by SCSI threads, which are SCSI-library-specific abstractions. A SCSI thread is assigned to each unit of SCSI work. In other words, one SCSI thread is assigned per SCSI request. Each SCSI thread is created in the context of the calling VxWorks task. The thread is managed by the SCSI manager, while the calling VxWorks task remains blocked. When the SCSI thread completes, the VxWorks task is unblocked and the SCSI thread is deleted. A SCSI thread has its own context or state variables, which are manipulated by the SCSI libraries and the controller driver. A maximum of one SCSI thread can be executing at any one time. In addition to managing the SCSI-thread state information, the SCSI manager is responsible for scheduling these SCSI threads. When there are multiple threads in existence, the different threads can be in various states representing different requirements. A SCSI thread can represent a new request for service, a connection timeout, a completion of service, or an event from the SCSI bus. As requests for service are submitted to the SCSI manager by VxWorks tasks, the associated threads must be processed based on priority or on a first-come-first-serves basis if their priority is the same. When multiple threads are eligible for activation, the SCSI manager follows a strict hierarchy of processing. Asynchronous bus events have the highest priority and are processed before any other type of SCSI thread. The order of processing is: events, timeouts, requests, and finally responses. The SCSI manager handles any race condition that develops between activation of a request and the asynchronous occurrence of an event from the SCSI bus. 322
I Writing a SCSI-2 Device Driver Once an appropriate SCSI thread is selected for execution, the SCSI manager despatches that thread and actual execution is handled by the controller-specific driver. Limitations The SCSI manager uses standard VxWorks ring buffers to manage SCSI requests. Using ring buffers is fast and efficient. The amount of SCSI work that can be queued depends upon the size of the allocated ring buffers. The SCSI manager also has some limitations such as the maximum number of threads allowed (scsiMaxNumThreads), the maximum number of SCSI requests from VxWorks tasks that can be put on the SCSI manager’s request queue (scsiMgrRequestQSize), the maximum number of SCSI bus events that can be put on the SCSI manager’s event queue (scsiMgrEventQSize), the maximum number of replies that can be put on the reply queue (scsiMgrReplyQSize), the maximum number of timeouts that can be put on the timeout queue (scsiMgrTimeoutQSize), and timeout values. Configuration It is possible to tune the size of the ring buffers and the number of SCSI threads to optimize a specific environment. In most cases, however, the default values are sufficient. These parameters—scsiMaxNumThreads, scsiMgrRequestQSize, scsiMgrReplyQSize, scsiMgrEventQSize, scsiMgrTimeoutQSize—are defined as global variables within the SCSI library and are assigned default values defined in scsiLib.h. These values can be reassigned in the BSP routine sysScsiInit( ) prior to the invocation of the driver’s xxxCtrlInit( ) routine. Then when scsiCtrlInit( )is invoked by the driver’s xxxCtrlInit( )routine, the new parameters are used for data structure allocation. The name, priority, and stack size of the scsiMgr task can also be customized from the controller driver’s xxxCtrlCreate( ) routine. Defaults are provided in scsiLib.h. For example, the default task name SCSI_DEF_TASK_NAME is tScsiTask, the default priority, SCSI_DEF_TASK_PRIORITY, is 5, and the default stack size, SCSI_DEF_TASK_STACK_SIZE, is 4000. I NOTE: The larger the number of expected VxWorks SCSI tasks, the larger the stack space required. Thought should be given to the stack size parameter when customizing the SCSI manager. 323
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VxWorks® 5.5 BSP DEVELOPER’S GUI
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1 Overview ........................
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Contents 1 Overview ...............
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Contents 3.6.5 Cache, MMU, and DMA
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Contents Memory-Mapped Chips ......
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Contents 7.3.3 System Configuration
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Contents F Generic Drivers ........
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Contents Stopping the Driver Withou
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1 Overview 1.1 Introduction One str
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1 Overview ■ New Drivers Many new
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1 Overview Included with Tornado (n
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1 Overview Table 1-1 Font Usage for
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2 BSP Organization 2.1 Introduction
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2 BSP Organization Files in the tar
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2 BSP Organization Files in the tar
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2 BSP Organization Version 1.0 BSPs
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2 BSP Organization SM_MEM_SIZE The
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2 BSP Organization For boards witho
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2 BSP Organization PCI_MSTR_IO_LOCA
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2 BSP Organization The entry point
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2 BSP Organization target.nr The fi
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2 BSP Organization bootrom This fil
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2 BSP Organization sysSerialHwInit(
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2 BSP Organization The Motorola M68
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2 BSP Organization Many VxWorks fac
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3 Creating a New BSP 3.1 Introducti
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3 Creating a New BSP 3.2 Setting Up
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3 Creating a New BSP Makefile At a
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3 Creating a New BSP char * sysBspR
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3 Creating a New BSP 3.6.7 SCSI VxW
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4 Hardware Guidelines 4.1 Introduct
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4 Hardware Guidelines Higher-level
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4 Hardware Guidelines 4.4.2 System
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4 Hardware Guidelines The following
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5 Driver Guidelines 5.1 Introductio
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5 Driver Guidelines Maintenance and
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5 Driver Guidelines word addresses.
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5 Driver Guidelines 5.4 Design Guid
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5 Driver Guidelines Per-Device Data
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5 Driver Guidelines To fix this sit
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5 Driver Guidelines 5.8 Driver Use
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5 Driver Guidelines ■ ■ Memory
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5 Driver Guidelines The level of ca
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5 Driver Guidelines cache for the d
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6 Components 6.1 Introduction Torna
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6 Components 6.2 Component Descript
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6 Components ■ User Presentation.
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6 Components Folder FOLDER_ANSI { N
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6 Components in a single project. I
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6 Components The component object i
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6 Components Parameters Parameters
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6 Components In the example, the co
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6 Components (2) comps/vxWorks/arch
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7 Validation Testing 7.1 Introducti
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8 Writing Portable C Code This chap
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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines INCLUDE
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10 Product Packaging 10.1 SETUP Dev
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10 Product Packaging ... include $(
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10 Product Packaging Vendor-Supplie
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A Upgrading a BSP for Tornado 2.0 T
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A Upgrading a BSP for Tornado 2.0 A
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B Upgrading a BSP for Tornado 2.2 T
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C Upgrading a BSP for the VxWorks N
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D VxWorks Boot Sequence Table D-1 d
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E Component Language E.1 Component
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E Component Language REQUIRES r1 r2
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E Component Language initialization
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E Component Language INCLUDE_MMU_BA
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F Generic Drivers F.1 Introduction
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F Generic Drivers CONSOLE_TTY This
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F Generic Drivers Define SIO_CALLBA
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G Upgrading 4.3 BSD Network Drivers
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H Implementing a MUX-Based Network
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H Implementing a MUX-Based Network
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K BSP Validation Checklists BSP Val
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K BSP Validation Checklists 7. Veri
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K BSP Validation Checklists 2. If t
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K BSP Validation Checklists Validat
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K BSP Validation Checklists Manufac
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K BSP Validation Checklists Manufac
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L Refgen NOTE: In Tornado 1.0.1 and
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L Refgen * SYNOPSIS * \cs * void xx
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L Refgen Yields output approximatel
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L Refgen EXAMPLE INCLUDES SEE ALSO
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M BSP Product Contents When you are
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M BSP Product Contents Do not inclu
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Index A abort button 82 addressing
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Index clocks see also individual cl
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Index naming conventions 95 perform
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Index INCLUDE_USR_APPL 38 INCLUDE_V
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Index network drivers 58 network in
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Index scsiCtrlLib 324 scsiDirectLib
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Index testing, validation 139-158 s
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