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