aic7xxx.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

  AHC_AIC7770_FE       = AHC_FENONE,
  AHC_AIC7850_FE       = AHC_SPIOCAP,
  AHC_AIC7860_FE       = AHC_ULTRA|AHC_SPIOCAP,
  AHC_AIC7870_FE       = AHC_FENONE,
  AHC_AIC7880_FE       = AHC_ULTRA,
  AHC_AIC7890_FE       = AHC_MORE_SRAM|AHC_CMD_CHAN|AHC_ULTRA2|
                         AHC_QUEUE_REGS|AHC_SG_PRELOAD,
  AHC_AIC7895_FE       = AHC_MORE_SRAM|AHC_CMD_CHAN|AHC_ULTRA,
  AHC_AIC7896_FE       = AHC_AIC7890_FE,
  AHC_AIC7892_FE       = AHC_AIC7890_FE|AHC_ULTRA160,
  AHC_AIC7899_FE       = AHC_AIC7890_FE|AHC_ULTRA160,
} ahc_feature;

struct aic7xxx_scb {
        struct aic7xxx_hwscb  *hscb;          /* corresponding hardware scb */
        Scsi_Cmnd             *cmd;              /* Scsi_Cmnd for this scb */
        struct aic7xxx_scb    *q_next;        /* next scb in queue */
        volatile scb_flag_type flags;         /* current state of scb */
        struct hw_scatterlist *sg_list;       /* SG list in adapter format */
        unsigned char          tag_action;
        unsigned char          sg_count;
        unsigned char          sense_cmd[6];  /*
                                               * Allocate 6 characters for
                                               * sense command.
                                               */
        unsigned int           sg_length; /* We init this during buildscb so we
                                           * don't have to calculate anything
                                           * during underflow/overflow/stat code
                                           */
        void                  *kmalloc_ptr;
};

/*
 * Define a linked list of SCBs.
 */
typedef struct {
  struct aic7xxx_scb *head;
  struct aic7xxx_scb *tail;
} scb_queue_type;

static struct {
  unsigned char errno;
  const char *errmesg;
} hard_error[] = {
  { ILLHADDR,  "Illegal Host Access" },
  { ILLSADDR,  "Illegal Sequencer Address referenced" },
  { ILLOPCODE, "Illegal Opcode in sequencer program" },
  { SQPARERR,  "Sequencer Ram Parity Error" },
  { DPARERR,   "Data-Path Ram Parity Error" },
  { MPARERR,   "Scratch Ram/SCB Array Ram Parity Error" },
  { PCIERRSTAT,"PCI Error detected" },
  { CIOPARERR, "CIOBUS Parity Error" }
};

static unsigned char
generic_sense[] = { REQUEST_SENSE, 0, 0, 0, 255, 0 };

typedef struct {
  scb_queue_type free_scbs;        /*
                                    * SCBs assigned to free slot on
                                    * card (no paging required)
                                    */
  struct aic7xxx_scb   *scb_array[AIC7XXX_MAXSCB];
  struct aic7xxx_hwscb *hscbs;
  unsigned char  numscbs;          /* current number of scbs */
  unsigned char  maxhscbs;         /* hardware scbs */
  unsigned char  maxscbs;          /* max scbs including pageable scbs */
  void          *hscb_kmalloc_ptr;
} scb_data_type;

struct target_cmd {
  unsigned char mesg_bytes[4];
  unsigned char command[28];
};

#define AHC_TRANS_CUR    0x0001
#define AHC_TRANS_ACTIVE 0x0002
#define AHC_TRANS_GOAL   0x0004
#define AHC_TRANS_USER   0x0008
#define AHC_TRANS_QUITE  0x0010
typedef struct {
  unsigned char cur_width;
  unsigned char goal_width;
  unsigned char cur_period;
  unsigned char goal_period;
  unsigned char cur_offset;
  unsigned char goal_offset;
  unsigned char user_width;
  unsigned char user_period;
  unsigned char user_offset;
} transinfo_type;

/*
 * Define a structure used for each host adapter.  Note, in order to avoid
 * problems with architectures I can't test on (because I don't have one,
 * such as the Alpha based systems) which happen to give faults for
 * non-aligned memory accesses, care was taken to align this structure
 * in a way that gauranteed all accesses larger than 8 bits were aligned
 * on the appropriate boundary.  It's also organized to try and be more
 * cache line efficient.  Be careful when changing this lest you might hurt
 * overall performance and bring down the wrath of the masses.
 */
struct aic7xxx_host {
  /*
   *  This is the first 64 bytes in the host struct
   */

  /*
   * We are grouping things here....first, items that get either read or
   * written with nearly every interrupt
   */
  volatile ahc_flag_type   flags;
  ahc_feature              features;         /* chip features */
  unsigned long            base;             /* card base address */
  volatile unsigned char  *maddr;            /* memory mapped address */
  unsigned long            isr_count;        /* Interrupt count */
  unsigned long            spurious_int;
  scb_data_type           *scb_data;
  volatile unsigned short  needsdtr;
  volatile unsigned short  sdtr_pending;
  volatile unsigned short  needwdtr;
  volatile unsigned short  wdtr_pending;
  struct aic7xxx_cmd_queue {
    Scsi_Cmnd *head;
    Scsi_Cmnd *tail;
  } completeq;

  /*
   * Things read/written on nearly every entry into aic7xxx_queue()
   */
  volatile scb_queue_type  waiting_scbs;
  unsigned short           discenable;       /* Targets allowed to disconnect */
  unsigned short           tagenable;        /* Targets using tagged I/O */
  unsigned short           orderedtag;       /* Ordered Q tags allowed */
  unsigned char            unpause;          /* unpause value for HCNTRL */
  unsigned char            pause;            /* pause value for HCNTRL */
  volatile unsigned char   qoutfifonext;
  volatile unsigned char   activescbs;       /* active scbs */
  volatile unsigned char   max_activescbs;
  volatile unsigned char   qinfifonext;

#define  DEVICE_PRESENT                 0x01
#define  BUS_DEVICE_RESET_PENDING       0x02
#define  DEVICE_RESET_DELAY             0x04
#define  DEVICE_PRINT_SDTR              0x08
#define  DEVICE_PRINT_WDTR              0x10
#define  DEVICE_WAS_BUSY                0x20
#define  DEVICE_SCANNED                 0x80
  volatile unsigned char   dev_flags[MAX_TARGETS];
  volatile unsigned char   dev_active_cmds[MAX_TARGETS];
  volatile unsigned char   dev_temp_queue_depth[MAX_TARGETS];
  unsigned char            dev_commands_sent[MAX_TARGETS];

  unsigned int             dev_timer_active; /* Which devs have a timer set */
  struct timer_list        dev_timer;
  unsigned long            dev_expires[MAX_TARGETS];

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,1,0)
  spinlock_t               spin_lock;
  volatile unsigned char   cpu_lock_count[NR_CPUS];
#endif


#ifdef AIC7XXX_FAKE_NEGOTIATION_CMDS
  Scsi_Cmnd               *dev_wdtr_cmnd[MAX_TARGETS];
  Scsi_Cmnd               *dev_sdtr_cmnd[MAX_TARGETS];
#endif

  unsigned char            dev_last_queue_full[MAX_TARGETS];
  unsigned char            dev_last_queue_full_count[MAX_TARGETS];
  unsigned char            dev_max_queue_depth[MAX_TARGETS];

  volatile scb_queue_type  delayed_scbs[MAX_TARGETS];


  unsigned char            msg_buf[9];       /* The message for the target */
  unsigned char            msg_type;
#define MSG_TYPE_NONE              0x00
#define MSG_TYPE_INITIATOR_MSGOUT  0x01
#define MSG_TYPE_INITIATOR_MSGIN   0x02
  unsigned char            msg_len;          /* Length of message */
  unsigned char            msg_index;        /* Index into msg_buf array */
  transinfo_type           transinfo[MAX_TARGETS];


  /*
   * We put the less frequently used host structure items after the more
   * frequently used items to try and ease the burden on the cache subsystem.
   * These entries are not *commonly* accessed, whereas the preceding entries
   * are accessed very often.  The only exceptions are the qinfifo, qoutfifo,
   * and untagged_scbs array.  But, they are often accessed only once and each
   * access into these arrays is likely to blow a cache line, so they are put
   * down here so we can minimize the number of cache lines required to hold
   * the preceeding entries.
   */

  volatile unsigned char   untagged_scbs[256];
  volatile unsigned char   qoutfifo[256];
  volatile unsigned char   qinfifo[256];
  unsigned int             irq;              /* IRQ for this adapter */
  int                      instance;         /* aic7xxx instance number */
  int                      scsi_id;          /* host adapter SCSI ID */
  int                      scsi_id_b;        /* channel B for twin adapters */
  unsigned int             bios_address;
  int                      board_name_index;
  unsigned short           needsdtr_copy;    /* default config */
  unsigned short           needwdtr_copy;    /* default config */
  unsigned short           ultraenb;         /* Ultra mode target list */
  unsigned short           bios_control;     /* bios control - SEEPROM */
  unsigned short           adapter_control;  /* adapter control - SEEPROM */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,1,92)
  struct pci_dev          *pdev;
#endif
  unsigned char            pci_bus;
  unsigned char            pci_device_fn;
  struct seeprom_config    sc;
  unsigned short           sc_type;
  unsigned short           sc_size;
  struct aic7xxx_host     *next;             /* allow for multiple IRQs */
  struct Scsi_Host        *host;             /* pointer to scsi host */
  int                      host_no;          /* SCSI host number */
  unsigned long            mbase;            /* I/O memory address */
  ahc_chip                 chip;             /* chip type */

  /*
   * Statistics Kept:
   *
   * Total Xfers (count for each command that has a data xfer),
   * broken down further by reads && writes.
   *
   * Binned sizes, writes && reads:
   *    < 512, 512, 1-2K, 2-4K, 4-8K, 8-16K, 16-32K, 32-64K, 64K-128K, > 128K
   *
   * Total amounts read/written above 512 bytes (amts under ignored)
   *
   * NOTE: Enabling this feature is likely to cause a noticeable performance
   * decrease as the accesses into the stats structures blows apart multiple
   * cache lines and is CPU time consuming.
   *
   * NOTE: Since it doesn't really buy us much, but consumes *tons* of RAM
   * and blows apart all sorts of cache lines, I modified this so that we
   * no longer look at the LUN.  All LUNs now go into the same bin on each
   * device for stats purposes.
   */
  struct aic7xxx_xferstats {
    long w_total;                          /* total writes */
    long r_total;                          /* total reads */
#ifdef AIC7XXX_PROC_STATS
    long w_bins[8];                       /* binned write */
    long r_bins[8];                       /* binned reads */
#endif /* AIC7XXX_PROC_STATS */
  } stats[MAX_TARGETS];                    /* [(channel << 3)|target] */

#if 0
  struct target_cmd       *targetcmds;
  unsigned int             num_targetcmds;
#endif

};

/*
 * Valid SCSIRATE values. (p. 3-17)
 * Provides a mapping of transfer periods in ns/4 to the proper value to
 * stick in the SCSIRATE reg to use that transfer rate.
 */
#define AHC_SYNCRATE_ULTRA2 0
#define AHC_SYNCRATE_ULTRA  2
#define AHC_SYNCRATE_FAST   5
static struct aic7xxx_syncrate {
  /* Rates in Ultra mode have bit 8 of sxfr set */
#define                ULTRA_SXFR 0x100
  int sxfr_ultra2;
  int sxfr;
  unsigned char period;
  const char *rate[2];
} aic7xxx_syncrates[] = {
  { 0x13,  0x000,  10,  {"40.0", "80.0"} },
  { 0x14,  0x000,  11,  {"33.0", "66.6"} },
  { 0x15,  0x100,  12,  {"20.0", "40.0"} },
  { 0x16,  0x110,  15,  {"16.0", "32.0"} },
  { 0x17,  0x120,  18,  {"13.4", "26.8"} },
  { 0x18,  0x000,  25,  {"10.0", "20.0"} },
  { 0x19,  0x010,  31,  {"8.0",  "16.0"} },
  { 0x1a,  0x020,  37,  {"6.67", "13.3"} },
  { 0x1b,  0x030,  43,  {"5.7",  "11.4"} },
  { 0x10,  0x040,  50,  {"5.0",  "10.0"} },
  { 0x00,  0x050,  56,  {"4.4",  "8.8" } },
  { 0x00,  0x060,  62,  {"4.0",  "8.0" } },
  { 0x00,  0x070,  68,  {"3.6",  "7.2" } },
  { 0x00,  0x000,  0,   {NULL, NULL}   },
};

#define CTL_OF_SCB(scb) (((scb->hscb)->target_channel_lun >> 3) & 0x1),  \
                        (((scb->hscb)->target_channel_lun >> 4) & 0xf), \
                        ((scb->hscb)->target_channel_lun & 0x07)

#define CTL_OF_CMD(cmd) ((cmd->channel) & 0x01),  \
                        ((cmd->target) & 0x0f), \
                        ((cmd->lun) & 0x07)

#define TARGET_INDEX(cmd)  ((cmd)->target | ((cmd)->channel << 3))

/*
 * A nice little define to make doing our printks a little easier
 */

#define WARN_LEAD KERN_WARNING "(scsi%d:%d:%d:%d) "
#define INFO_LEAD KERN_INFO "(scsi%d:%d:%d:%d) "

/*
 * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 *       cards in the system.  This should be fixed.  Exceptions to this
 *       rule are noted in the comments.
 */


/*
 * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 * has no effect on any later resets that might occur due to things like
 * SCSI bus timeouts.
 */