/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
*
* Linux MegaRAID device driver
*
* Copyright ( c ) 2003 - 2004 LSI Logic Corporation .
*
* 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/mutex.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 <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 )
#define HBA_SIGNATURE_64_BIT 0 x299
#define PCI_CONF_AMISIG64 0 xa4
#define MEGA_SCSI_INQ_EVPD 1
#define MEGA_INVALID_FIELD_IN_CDB 0 x24
/**
* scb_t - scsi command control block
* @ ccb : command control block for individual driver
* @ list : list of control blocks
* @ gp : general purpose field for LLDs
* @ sno : all SCBs have a serial number
* @ scp : associated scsi command
* @ state : current state of scb
* @ dma_dir : direction of data transfer
* @ dma_type : transfer with sg list , buffer , or no data transfer
* @ dev_channel : actual channel on the device
* @ dev_target : actual target on the device
* @ 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 0 x0000 /* on the free list */
#define SCB_ACTIVE 0 x0001 /* off the free list */
#define SCB_PENDQ 0 x0002 /* on the pending queue */
#define SCB_ISSUED 0 x0004 /* issued - owner f/w */
#define SCB_ABORT 0 x0008 /* Got an abort for this one */
#define SCB_RESET 0 x0010 /* Got a reset for this one */
/*
* DMA types for scb
*/
#define MRAID_DMA_NONE 0 x0000 /* no data transfer for this command */
#define MRAID_DMA_WSG 0 x0001 /* data transfer using a sg list */
#define MRAID_DMA_WBUF 0 x0002 /* data transfer using a contiguous buffer */
/**
* struct adapter_t - driver ' s initialization structure
* @ aram dpc_h : tasklet handle
* @ pdev : pci configuration pointer for kernel
* @ host : pointer to host structure of mid - layer
* @ lock : synchronization lock for mid - layer and driver
* @ quiescent : driver is quiescent for now .
* @ outstanding_cmds : number of commands pending in the driver
* @ kscb_list : pointer to the bulk of SCBs pointers for IO
* @ kscb_pool : pool of free scbs for IO
* @ kscb_pool_lock : lock for pool of free scbs
* @ pend_list : pending commands list
* @ pend_list_lock : exclusion lock for pending commands list
* @ completed_list : list of completed commands
* @ completed_list_lock : exclusion lock for list of completed commands
* @ sglen : max sg elements supported
* @ device_ids : to convert kernel device addr to our devices .
* @ raid_device : raid adapter specific pointer
* @ max_channel : maximum channel number supported - inclusive
* @ max_target : max target supported - inclusive
* @ max_lun : max lun supported - inclusive
* @ unique_id : unique identifier for each adapter
* @ irq : IRQ for this adapter
* @ ito : internal timeout value , ( - 1 ) means no timeout
* @ ibuf : buffer to issue internal commands
* @ ibuf_dma_h : dma handle for the above buffer
* @ uscb_list : SCB pointers for user cmds , common mgmt module
* @ uscb_pool : pool of SCBs for user commands
* @ uscb_pool_lock : exclusion lock for these SCBs
* @ max_cmds : max outstanding commands
* @ fw_version : firmware version
* @ bios_version : bios version
* @ max_cdb_sz : biggest CDB size supported .
* @ ha : is high availability present - clustering
* @ init_id : initiator ID , the default value should be 7
* @ max_sectors : max sectors per request
* @ cmd_per_lun : max outstanding commands per LUN
* @ 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;
int 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) (u32)(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))
#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
/**
* MRAID_GET_DEVICE_MAP - device ids
* @ adp : adapter ' s soft state
* @ scp : mid - layer scsi command pointer
* @ p_chan : physical channel on the controller
* @ target : target id of the device or logical drive number
* @ 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_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 = 0 xFF; \
target = \
(adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
} \
else { \
p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \
[SCP2TARGET(scp)] >> 8 ) & 0 xFF; \
target = ((adp)->device_ids[SCP2CHANNEL(scp)] \
[SCP2TARGET(scp)] & 0 xFF); \
}
/*
* # # # 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__, __func__); \
}
#else
#define ASSERT(expression)
#endif
/**
* struct mraid_pci_blk - structure holds DMA memory block info
* @ vaddr : virtual address to a memory block
* @ 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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