aic79xx_osm.h

h内核

	 * at the time of the last QUEUE FULL event.
	 */
	u_int			tags_on_last_queuefull;

	/*
	 * How many times we have seen a queue full
	 * with the same number of tags.  This is used
	 * to stop our adaptive queue depth algorithm
	 * on devices with a fixed number of tags.
	 */
	u_int			last_queuefull_same_count;
#define AHD_LOCK_TAGS_COUNT 50

	/*
	 * How many transactions have been queued
	 * without the device going idle.  We use
	 * this statistic to determine when to issue
	 * an ordered tag to prevent transaction
	 * starvation.  This statistic is only updated
	 * if the AHD_DEV_PERIODIC_OTAG flag is set
	 * on this device.
	 */
	u_int			commands_since_idle_or_otag;
#define AHD_OTAG_THRESH	500

	int			lun;
	Scsi_Device	       *scsi_device;
	struct			ahd_linux_target *target;
};

typedef enum {
	AHD_DV_REQUIRED		 = 0x01,
	AHD_INQ_VALID		 = 0x02,
	AHD_BASIC_DV		 = 0x04,
	AHD_ENHANCED_DV		 = 0x08
} ahd_linux_targ_flags;

/* DV States */
typedef enum {
	AHD_DV_STATE_EXIT = 0,
	AHD_DV_STATE_INQ_SHORT_ASYNC,
	AHD_DV_STATE_INQ_ASYNC,
	AHD_DV_STATE_INQ_ASYNC_VERIFY,
	AHD_DV_STATE_TUR,
	AHD_DV_STATE_REBD,
	AHD_DV_STATE_INQ_VERIFY,
	AHD_DV_STATE_WEB,
	AHD_DV_STATE_REB,
	AHD_DV_STATE_SU,
	AHD_DV_STATE_BUSY
} ahd_dv_state;

struct ahd_linux_target {
	struct ahd_linux_device	 *devices[AHD_NUM_LUNS];
	int			  channel;
	int			  target;
	int			  refcount;
	struct ahd_transinfo	  last_tinfo;
	struct ahd_softc	 *ahd;
	ahd_linux_targ_flags	  flags;
	struct scsi_inquiry_data *inq_data;
	/*
	 * The next "fallback" period to use for narrow/wide transfers.
	 */
	uint8_t			  dv_next_narrow_period;
	uint8_t			  dv_next_wide_period;
	uint8_t			  dv_max_width;
	uint8_t			  dv_max_ppr_options;
	uint8_t			  dv_last_ppr_options;
	u_int			  dv_echo_size;
	ahd_dv_state		  dv_state;
	u_int			  dv_state_retry;
	uint8_t			 *dv_buffer;
	uint8_t			 *dv_buffer1;

	/*
	 * Cumulative counter of errors.
	 */
	u_long			errors_detected;
	u_long			cmds_since_error;
};

/********************* Definitions Required by the Core ***********************/
/*
 * Number of SG segments we require.  So long as the S/G segments for
 * a particular transaction are allocated in a physically contiguous
 * manner and are allocated below 4GB, the number of S/G segments is
 * unrestricted.
 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
/*
 * We dynamically adjust the number of segments in pre-2.5 kernels to
 * avoid fragmentation issues in the SCSI mid-layer's private memory
 * allocator.  See aic79xx_osm.c ahd_linux_size_nseg() for details.
 */
extern u_int ahd_linux_nseg;
#define	AHD_NSEG ahd_linux_nseg
#define	AHD_LINUX_MIN_NSEG 64
#else
#define	AHD_NSEG 128
#endif

/*
 * Per-SCB OSM storage.
 */
typedef enum {
	AHD_SCB_UP_EH_SEM = 0x1
} ahd_linux_scb_flags;

struct scb_platform_data {
	struct ahd_linux_device	*dev;
	dma_addr_t		 buf_busaddr;
	uint32_t		 xfer_len;
	uint32_t		 sense_resid;	/* Auto-Sense residual */
	ahd_linux_scb_flags	 flags;
};

/*
 * Define a structure used for each host adapter.  All members are
 * aligned on a boundary >= the size of the member to honor the
 * alignment restrictions of the various platforms supported by
 * this driver.
 */
typedef enum {
	AHD_DV_WAIT_SIMQ_EMPTY	 = 0x01,
	AHD_DV_WAIT_SIMQ_RELEASE = 0x02,
	AHD_DV_ACTIVE		 = 0x04,
	AHD_DV_SHUTDOWN		 = 0x08,
	AHD_RUN_CMPLT_Q_TIMER	 = 0x10
} ahd_linux_softc_flags;

TAILQ_HEAD(ahd_completeq, ahd_cmd);

struct ahd_platform_data {
	/*
	 * Fields accessed from interrupt context.
	 */
	struct ahd_linux_target *targets[AHD_NUM_TARGETS]; 
	TAILQ_HEAD(, ahd_linux_device) device_runq;
	struct ahd_completeq	 completeq;

	spinlock_t		 spin_lock;
	struct tasklet_struct	 runq_tasklet;
	u_int			 qfrozen;
	pid_t			 dv_pid;
	struct timer_list	 completeq_timer;
	struct timer_list	 reset_timer;
	struct timer_list	 stats_timer;
	struct semaphore	 eh_sem;
	struct semaphore	 dv_sem;
	struct semaphore	 dv_cmd_sem;	/* XXX This needs to be in
						 * the target struct
						 */
	struct scsi_device	*dv_scsi_dev;
	struct Scsi_Host        *host;		/* pointer to scsi host */
#define AHD_LINUX_NOIRQ	((uint32_t)~0)
	uint32_t		 irq;		/* IRQ for this adapter */
	uint32_t		 bios_address;
	uint32_t		 mem_busaddr;	/* Mem Base Addr */
	uint64_t		 hw_dma_mask;
	ahd_linux_softc_flags	 flags;
};

/************************** OS Utility Wrappers *******************************/
#define printf printk
#define M_NOWAIT GFP_ATOMIC
#define M_WAITOK 0
#define malloc(size, type, flags) kmalloc(size, flags)
#define free(ptr, type) kfree(ptr)

static __inline void ahd_delay(long);
static __inline void
ahd_delay(long usec)
{
	/*
	 * udelay on Linux can have problems for
	 * multi-millisecond waits.  Wait at most
	 * 1024us per call.
	 */
	while (usec > 0) {
		udelay(usec % 1024);
		usec -= 1024;
	}
}


/***************************** Low Level I/O **********************************/
static __inline uint8_t ahd_inb(struct ahd_softc * ahd, long port);
static __inline uint16_t ahd_inw_atomic(struct ahd_softc * ahd, long port);
static __inline void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
static __inline void ahd_outw_atomic(struct ahd_softc * ahd,
				     long port, uint16_t val);
static __inline void ahd_outsb(struct ahd_softc * ahd, long port,
			       uint8_t *, int count);
static __inline void ahd_insb(struct ahd_softc * ahd, long port,
			       uint8_t *, int count);

static __inline uint8_t
ahd_inb(struct ahd_softc * ahd, long port)
{
	uint8_t x;

	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
		x = readb(ahd->bshs[0].maddr + port);
	} else {
		x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
	}
	mb();
	return (x);
}

static __inline uint16_t
ahd_inw_atomic(struct ahd_softc * ahd, long port)
{
	uint8_t x;

	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
		x = readw(ahd->bshs[0].maddr + port);
	} else {
		x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
	}
	mb();
	return (x);
}

static __inline void
ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
{
	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
		writeb(val, ahd->bshs[0].maddr + port);
	} else {
		outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
	}
	mb();
}

static __inline void
ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
{
	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
		writew(val, ahd->bshs[0].maddr + port);
	} else {
		outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
	}
	mb();
}

static __inline void
ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
{
	int i;

	/*
	 * There is probably a more efficient way to do this on Linux
	 * but we don't use this for anything speed critical and this
	 * should work.
	 */
	for (i = 0; i < count; i++)
		ahd_outb(ahd, port, *array++);
}

static __inline void
ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
{
	int i;

	/*
	 * There is probably a more efficient way to do this on Linux
	 * but we don't use this for anything speed critical and this
	 * should work.
	 */
	for (i = 0; i < count; i++)
		*array++ = ahd_inb(ahd, port);
}

/**************************** Initialization **********************************/
int		ahd_linux_register_host(struct ahd_softc *,
					Scsi_Host_Template *);

uint64_t	ahd_linux_get_memsize(void);

/*************************** Pretty Printing **********************************/
struct info_str {
	char *buffer;
	int length;
	off_t offset;
	int pos;
};

void	ahd_format_transinfo(struct info_str *info,
			     struct ahd_transinfo *tinfo);

/******************************** Locking *************************************/
/* Lock protecting internal data structures */
static __inline void ahd_lockinit(struct ahd_softc *);
static __inline void ahd_lock(struct ahd_softc *, unsigned long *flags);
static __inline void ahd_unlock(struct ahd_softc *, unsigned long *flags);

/* Lock acquisition and release of the above lock in midlayer entry points. */
static __inline void ahd_midlayer_entrypoint_lock(struct ahd_softc *,
						  unsigned long *flags);
static __inline void ahd_midlayer_entrypoint_unlock(struct ahd_softc *,
						    unsigned long *flags);

/* Lock held during command compeletion to the upper layer */
static __inline void ahd_done_lockinit(struct ahd_softc *);
static __inline void ahd_done_lock(struct ahd_softc *, unsigned long *flags);
static __inline void ahd_done_unlock(struct ahd_softc *, unsigned long *flags);

/* Lock held during ahd_list manipulation and ahd softc frees */
extern spinlock_t ahd_list_spinlock;
static __inline void ahd_list_lockinit(void);
static __inline void ahd_list_lock(unsigned long *flags);
static __inline void ahd_list_unlock(unsigned long *flags);

static __inline void
ahd_lockinit(struct ahd_softc *ahd)
{
	spin_lock_init(&ahd->platform_data->spin_lock);
}

static __inline void
ahd_lock(struct ahd_softc *ahd, unsigned long *flags)
{
	spin_lock_irqsave(&ahd->platform_data->spin_lock, *flags);
}

static __inline void
ahd_unlock(struct ahd_softc *ahd, unsigned long *flags)
{
	spin_unlock_irqrestore(&ahd->platform_data->spin_lock, *flags);
}

static __inline void
ahd_midlayer_entrypoint_lock(struct ahd_softc *ahd, unsigned long *flags)
{
	/*
	 * In 2.5.X and some 2.4.X versions, the midlayer takes our
	 * lock just before calling us, so we avoid locking again.
	 * For other kernel versions, the io_request_lock is taken
	 * just before our entry point is called.  In this case, we
	 * trade the io_request_lock for our per-softc lock.
	 */
#if AHD_SCSI_HAS_HOST_LOCK == 0
	spin_unlock(&io_request_lock);
	spin_lock(&ahd->platform_data->spin_lock);
#endif
}

static __inline void
ahd_midlayer_entrypoint_unlock(struct ahd_softc *ahd, unsigned long *flags)
{
#if AHD_SCSI_HAS_HOST_LOCK == 0
	spin_unlock(&ahd->platform_data->spin_lock);
	spin_lock(&io_request_lock);
#endif
}

static __inline void
ahd_done_lockinit(struct ahd_softc *ahd)
{
	/*
	 * In 2.5.X, our own lock is held during completions.
	 * In previous versions, the io_request_lock is used.
	 * In either case, we can't initialize this lock again.
	 */
}

static __inline void
ahd_done_lock(struct ahd_softc *ahd, unsigned long *flags)
{
#if AHD_SCSI_HAS_HOST_LOCK == 0
	spin_lock(&io_request_lock);
#endif
}

static __inline void
ahd_done_unlock(struct ahd_softc *ahd, unsigned long *flags)
{
#if AHD_SCSI_HAS_HOST_LOCK == 0
	spin_unlock(&io_request_lock);
#endif
}