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284 lines
9.3 KiB
284 lines
9.3 KiB
/*
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*
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* Linux MegaRAID device driver
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*
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* Copyright (c) 2003-2004 LSI Logic Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* FILE : mega_common.h
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*
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* Libaray of common routine used by all low-level megaraid drivers
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*/
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#ifndef _MEGA_COMMON_H_
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#define _MEGA_COMMON_H_
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/blkdev.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/dma-mapping.h>
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#include <asm/semaphore.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#define LSI_MAX_CHANNELS 16
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#define LSI_MAX_LOGICAL_DRIVES_64LD (64+1)
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/**
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* scb_t - scsi command control block
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* @param ccb : command control block for individual driver
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* @param list : list of control blocks
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* @param gp : general purpose field for LLDs
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* @param sno : all SCBs have a serial number
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* @param scp : associated scsi command
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* @param state : current state of scb
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* @param dma_dir : direction of data transfer
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* @param dma_type : transfer with sg list, buffer, or no data transfer
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* @param dev_channel : actual channel on the device
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* @param dev_target : actual target on the device
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* @param status : completion status
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*
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* This is our central data structure to issue commands the each driver.
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* Driver specific data structures are maintained in the ccb field.
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* scb provides a field 'gp', which can be used by LLD for its own purposes
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*
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* dev_channel and dev_target must be initialized with the actual channel and
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* target on the controller.
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*/
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typedef struct {
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caddr_t ccb;
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struct list_head list;
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unsigned long gp;
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unsigned int sno;
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struct scsi_cmnd *scp;
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uint32_t state;
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uint32_t dma_direction;
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uint32_t dma_type;
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uint16_t dev_channel;
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uint16_t dev_target;
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uint32_t status;
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} scb_t;
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/*
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* SCB states as it transitions from one state to another
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*/
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#define SCB_FREE 0x0000 /* on the free list */
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#define SCB_ACTIVE 0x0001 /* off the free list */
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#define SCB_PENDQ 0x0002 /* on the pending queue */
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#define SCB_ISSUED 0x0004 /* issued - owner f/w */
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#define SCB_ABORT 0x0008 /* Got an abort for this one */
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#define SCB_RESET 0x0010 /* Got a reset for this one */
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/*
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* DMA types for scb
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*/
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#define MRAID_DMA_NONE 0x0000 /* no data transfer for this command */
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#define MRAID_DMA_WSG 0x0001 /* data transfer using a sg list */
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#define MRAID_DMA_WBUF 0x0002 /* data transfer using a contiguous buffer */
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/**
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* struct adapter_t - driver's initialization structure
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* @param dpc_h : tasklet handle
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* @param pdev : pci configuration pointer for kernel
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* @param host : pointer to host structure of mid-layer
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* @param lock : synchronization lock for mid-layer and driver
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* @param quiescent : driver is quiescent for now.
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* @param outstanding_cmds : number of commands pending in the driver
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* @param kscb_list : pointer to the bulk of SCBs pointers for IO
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* @param kscb_pool : pool of free scbs for IO
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* @param kscb_pool_lock : lock for pool of free scbs
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* @param pend_list : pending commands list
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* @param pend_list_lock : exlusion lock for pending commands list
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* @param completed_list : list of completed commands
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* @param completed_list_lock : exclusion lock for list of completed commands
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* @param sglen : max sg elements supported
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* @param device_ids : to convert kernel device addr to our devices.
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* @param raid_device : raid adapter specific pointer
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* @param max_channel : maximum channel number supported - inclusive
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* @param max_target : max target supported - inclusive
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* @param max_lun : max lun supported - inclusive
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* @param unique_id : unique identifier for each adapter
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* @param irq : IRQ for this adapter
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* @param ito : internal timeout value, (-1) means no timeout
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* @param ibuf : buffer to issue internal commands
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* @param ibuf_dma_h : dma handle for the above buffer
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* @param uscb_list : SCB pointers for user cmds, common mgmt module
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* @param uscb_pool : pool of SCBs for user commands
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* @param uscb_pool_lock : exclusion lock for these SCBs
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* @param max_cmds : max outstanding commands
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* @param fw_version : firmware version
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* @param bios_version : bios version
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* @param max_cdb_sz : biggest CDB size supported.
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* @param ha : is high availability present - clustering
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* @param init_id : initiator ID, the default value should be 7
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* @param max_sectors : max sectors per request
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* @param cmd_per_lun : max outstanding commands per LUN
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* @param being_detached : set when unloading, no more mgmt calls
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*
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*
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* mraid_setup_device_map() can be called anytime after the device map is
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* available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is
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* required, usually from LLD's queue entry point. The formar API sets up the
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* MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the
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* device in question is a logical drive.
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*
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* quiescent flag should be set by the driver if it is not accepting more
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* commands
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*
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* NOTE: The fields of this structures are placed to minimize cache misses
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*/
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// amount of space required to store the bios and firmware version strings
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#define VERSION_SIZE 16
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typedef struct {
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struct tasklet_struct dpc_h;
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struct pci_dev *pdev;
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struct Scsi_Host *host;
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spinlock_t lock;
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uint8_t quiescent;
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int outstanding_cmds;
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scb_t *kscb_list;
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struct list_head kscb_pool;
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spinlock_t kscb_pool_lock;
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struct list_head pend_list;
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spinlock_t pend_list_lock;
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struct list_head completed_list;
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spinlock_t completed_list_lock;
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uint16_t sglen;
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int device_ids[LSI_MAX_CHANNELS]
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[LSI_MAX_LOGICAL_DRIVES_64LD];
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caddr_t raid_device;
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uint8_t max_channel;
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uint16_t max_target;
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uint8_t max_lun;
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uint32_t unique_id;
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uint8_t irq;
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uint8_t ito;
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caddr_t ibuf;
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dma_addr_t ibuf_dma_h;
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scb_t *uscb_list;
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struct list_head uscb_pool;
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spinlock_t uscb_pool_lock;
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int max_cmds;
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uint8_t fw_version[VERSION_SIZE];
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uint8_t bios_version[VERSION_SIZE];
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uint8_t max_cdb_sz;
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uint8_t ha;
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uint16_t init_id;
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uint16_t max_sectors;
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uint16_t cmd_per_lun;
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atomic_t being_detached;
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} adapter_t;
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#define SCSI_FREE_LIST_LOCK(adapter) (&adapter->kscb_pool_lock)
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#define USER_FREE_LIST_LOCK(adapter) (&adapter->uscb_pool_lock)
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#define PENDING_LIST_LOCK(adapter) (&adapter->pend_list_lock)
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#define COMPLETED_LIST_LOCK(adapter) (&adapter->completed_list_lock)
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// conversion from scsi command
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#define SCP2HOST(scp) (scp)->device->host // to host
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#define SCP2HOSTDATA(scp) SCP2HOST(scp)->hostdata // to soft state
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#define SCP2CHANNEL(scp) (scp)->device->channel // to channel
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#define SCP2TARGET(scp) (scp)->device->id // to target
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#define SCP2LUN(scp) (scp)->device->lun // to LUN
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// generic macro to convert scsi command and host to controller's soft state
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#define SCSIHOST2ADAP(host) (((caddr_t *)(host->hostdata))[0])
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#define SCP2ADAPTER(scp) (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp))
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/**
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* MRAID_GET_DEVICE_MAP - device ids
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* @param adp - Adapter's soft state
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* @param scp - mid-layer scsi command pointer
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* @param p_chan - physical channel on the controller
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* @param target - target id of the device or logical drive number
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* @param islogical - set if the command is for the logical drive
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*
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* Macro to retrieve information about device class, logical or physical and
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* the corresponding physical channel and target or logical drive number
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**/
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#define MRAID_IS_LOGICAL(adp, scp) \
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(SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0
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#define MRAID_IS_LOGICAL_SDEV(adp, sdev) \
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(sdev->channel == (adp)->max_channel) ? 1 : 0
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#define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical) \
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/* \
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* Is the request coming for the virtual channel \
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*/ \
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islogical = MRAID_IS_LOGICAL(adp, scp); \
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\
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/* \
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* Get an index into our table of drive ids mapping \
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*/ \
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if (islogical) { \
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p_chan = 0xFF; \
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target = \
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(adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
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} \
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else { \
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p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \
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[SCP2TARGET(scp)] >> 8) & 0xFF; \
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target = ((adp)->device_ids[SCP2CHANNEL(scp)] \
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[SCP2TARGET(scp)] & 0xFF); \
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}
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/*
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* ### Helper routines ###
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*/
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#define LSI_DBGLVL mraid_debug_level // each LLD must define a global
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// mraid_debug_level
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#ifdef DEBUG
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#if defined (_ASSERT_PANIC)
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#define ASSERT_ACTION panic
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#else
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#define ASSERT_ACTION printk
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#endif
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#define ASSERT(expression) \
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if (!(expression)) { \
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ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \
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#expression, __FILE__, __LINE__, __FUNCTION__); \
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}
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#else
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#define ASSERT(expression)
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#endif
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/*
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* struct mraid_pci_blk - structure holds DMA memory block info
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* @param vaddr : virtual address to a memory block
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* @param dma_addr : DMA handle to a memory block
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*
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* This structure is filled up for the caller. It is the responsibilty of the
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* caller to allocate this array big enough to store addresses for all
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* requested elements
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*/
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struct mraid_pci_blk {
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caddr_t vaddr;
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dma_addr_t dma_addr;
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};
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#endif // _MEGA_COMMON_H_
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// vim: set ts=8 sw=8 tw=78:
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