aic79xx_osm.c

h内核

"		Shorten the selection timeout to 128ms\n"
"\n"
"	options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
"\n"
"	Sample /etc/modprobe.conf line:\n"
"		Change Read Streaming for Controller's 2 and 3\n"
"\n"
"	options aic79xx 'aic79xx=rd_strm:{..0xFFF0.0xC0F0}'");

static void ahd_linux_handle_scsi_status(struct ahd_softc *,
					 struct ahd_linux_device *,
					 struct scb *);
static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
					 Scsi_Cmnd *cmd);
static void ahd_linux_filter_inquiry(struct ahd_softc *ahd,
				     struct ahd_devinfo *devinfo);
static void ahd_linux_dev_timed_unfreeze(u_long arg);
static void ahd_linux_sem_timeout(u_long arg);
static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
static void ahd_linux_size_nseg(void);
static void ahd_linux_thread_run_complete_queue(struct ahd_softc *ahd);
static void ahd_linux_start_dv(struct ahd_softc *ahd);
static void ahd_linux_dv_timeout(struct scsi_cmnd *cmd);
static int  ahd_linux_dv_thread(void *data);
static void ahd_linux_kill_dv_thread(struct ahd_softc *ahd);
static void ahd_linux_dv_target(struct ahd_softc *ahd, u_int target);
static void ahd_linux_dv_transition(struct ahd_softc *ahd,
				    struct scsi_cmnd *cmd,
				    struct ahd_devinfo *devinfo,
				    struct ahd_linux_target *targ);
static void ahd_linux_dv_fill_cmd(struct ahd_softc *ahd,
				  struct scsi_cmnd *cmd,
				  struct ahd_devinfo *devinfo);
static void ahd_linux_dv_inq(struct ahd_softc *ahd,
			     struct scsi_cmnd *cmd,
			     struct ahd_devinfo *devinfo,
			     struct ahd_linux_target *targ,
			     u_int request_length);
static void ahd_linux_dv_tur(struct ahd_softc *ahd,
			     struct scsi_cmnd *cmd,
			     struct ahd_devinfo *devinfo);
static void ahd_linux_dv_rebd(struct ahd_softc *ahd,
			      struct scsi_cmnd *cmd,
			      struct ahd_devinfo *devinfo,
			      struct ahd_linux_target *targ);
static void ahd_linux_dv_web(struct ahd_softc *ahd,
			     struct scsi_cmnd *cmd,
			     struct ahd_devinfo *devinfo,
			     struct ahd_linux_target *targ);
static void ahd_linux_dv_reb(struct ahd_softc *ahd,
			     struct scsi_cmnd *cmd,
			     struct ahd_devinfo *devinfo,
			     struct ahd_linux_target *targ);
static void ahd_linux_dv_su(struct ahd_softc *ahd,
			    struct scsi_cmnd *cmd,
			    struct ahd_devinfo *devinfo,
			    struct ahd_linux_target *targ);
static int ahd_linux_fallback(struct ahd_softc *ahd,
			      struct ahd_devinfo *devinfo);
static __inline int ahd_linux_dv_fallback(struct ahd_softc *ahd,
					  struct ahd_devinfo *devinfo);
static void ahd_linux_dv_complete(Scsi_Cmnd *cmd);
static void ahd_linux_generate_dv_pattern(struct ahd_linux_target *targ);
static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
				     struct ahd_devinfo *devinfo);
static u_int ahd_linux_user_dv_setting(struct ahd_softc *ahd);
static void ahd_linux_setup_user_rd_strm_settings(struct ahd_softc *ahd);
static void ahd_linux_device_queue_depth(struct ahd_softc *ahd,
					 struct ahd_linux_device *dev);
static struct ahd_linux_target*	ahd_linux_alloc_target(struct ahd_softc*,
						       u_int, u_int);
static void			ahd_linux_free_target(struct ahd_softc*,
						      struct ahd_linux_target*);
static struct ahd_linux_device*	ahd_linux_alloc_device(struct ahd_softc*,
						       struct ahd_linux_target*,
						       u_int);
static void			ahd_linux_free_device(struct ahd_softc*,
						      struct ahd_linux_device*);
static void ahd_linux_run_device_queue(struct ahd_softc*,
				       struct ahd_linux_device*);
static void ahd_linux_setup_tag_info_global(char *p);
static aic_option_callback_t ahd_linux_setup_tag_info;
static aic_option_callback_t ahd_linux_setup_rd_strm_info;
static aic_option_callback_t ahd_linux_setup_dv;
static aic_option_callback_t ahd_linux_setup_iocell_info;
static int ahd_linux_next_unit(void);
static void ahd_runq_tasklet(unsigned long data);
static int aic79xx_setup(char *c);

/****************************** Inlines ***************************************/
static __inline void ahd_schedule_completeq(struct ahd_softc *ahd);
static __inline void ahd_schedule_runq(struct ahd_softc *ahd);
static __inline void ahd_setup_runq_tasklet(struct ahd_softc *ahd);
static __inline void ahd_teardown_runq_tasklet(struct ahd_softc *ahd);
static __inline struct ahd_linux_device*
		     ahd_linux_get_device(struct ahd_softc *ahd, u_int channel,
					  u_int target, u_int lun, int alloc);
static struct ahd_cmd *ahd_linux_run_complete_queue(struct ahd_softc *ahd);
static __inline void ahd_linux_check_device_queue(struct ahd_softc *ahd,
						  struct ahd_linux_device *dev);
static __inline struct ahd_linux_device *
		     ahd_linux_next_device_to_run(struct ahd_softc *ahd);
static __inline void ahd_linux_run_device_queues(struct ahd_softc *ahd);
static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);

static __inline void
ahd_schedule_completeq(struct ahd_softc *ahd)
{
	if ((ahd->platform_data->flags & AHD_RUN_CMPLT_Q_TIMER) == 0) {
		ahd->platform_data->flags |= AHD_RUN_CMPLT_Q_TIMER;
		ahd->platform_data->completeq_timer.expires = jiffies;
		add_timer(&ahd->platform_data->completeq_timer);
	}
}

/*
 * Must be called with our lock held.
 */
static __inline void
ahd_schedule_runq(struct ahd_softc *ahd)
{
	tasklet_schedule(&ahd->platform_data->runq_tasklet);
}

static __inline
void ahd_setup_runq_tasklet(struct ahd_softc *ahd)
{
	tasklet_init(&ahd->platform_data->runq_tasklet, ahd_runq_tasklet,
		     (unsigned long)ahd);
}

static __inline void
ahd_teardown_runq_tasklet(struct ahd_softc *ahd)
{
	tasklet_kill(&ahd->platform_data->runq_tasklet);
}

static __inline struct ahd_linux_device*
ahd_linux_get_device(struct ahd_softc *ahd, u_int channel, u_int target,
		     u_int lun, int alloc)
{
	struct ahd_linux_target *targ;
	struct ahd_linux_device *dev;
	u_int target_offset;

	target_offset = target;
	if (channel != 0)
		target_offset += 8;
	targ = ahd->platform_data->targets[target_offset];
	if (targ == NULL) {
		if (alloc != 0) {
			targ = ahd_linux_alloc_target(ahd, channel, target);
			if (targ == NULL)
				return (NULL);
		} else
			return (NULL);
	}
	dev = targ->devices[lun];
	if (dev == NULL && alloc != 0)
		dev = ahd_linux_alloc_device(ahd, targ, lun);
	return (dev);
}

#define AHD_LINUX_MAX_RETURNED_ERRORS 4
static struct ahd_cmd *
ahd_linux_run_complete_queue(struct ahd_softc *ahd)
{	
	struct	ahd_cmd *acmd;
	u_long	done_flags;
	int	with_errors;

	with_errors = 0;
	ahd_done_lock(ahd, &done_flags);
	while ((acmd = TAILQ_FIRST(&ahd->platform_data->completeq)) != NULL) {
		Scsi_Cmnd *cmd;

		if (with_errors > AHD_LINUX_MAX_RETURNED_ERRORS) {
			/*
			 * Linux uses stack recursion to requeue
			 * commands that need to be retried.  Avoid
			 * blowing out the stack by "spoon feeding"
			 * commands that completed with error back
			 * the operating system in case they are going
			 * to be retried. "ick"
			 */
			ahd_schedule_completeq(ahd);
			break;
		}
		TAILQ_REMOVE(&ahd->platform_data->completeq,
			     acmd, acmd_links.tqe);
		cmd = &acmd_scsi_cmd(acmd);
		cmd->host_scribble = NULL;
		if (ahd_cmd_get_transaction_status(cmd) != DID_OK
		 || (cmd->result & 0xFF) != SCSI_STATUS_OK)
			with_errors++;

		cmd->scsi_done(cmd);
	}
	ahd_done_unlock(ahd, &done_flags);
	return (acmd);
}

static __inline void
ahd_linux_check_device_queue(struct ahd_softc *ahd,
			     struct ahd_linux_device *dev)
{
	if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) != 0
	 && dev->active == 0) {
		dev->flags &= ~AHD_DEV_FREEZE_TIL_EMPTY;
		dev->qfrozen--;
	}

	if (TAILQ_FIRST(&dev->busyq) == NULL
	 || dev->openings == 0 || dev->qfrozen != 0)
		return;

	ahd_linux_run_device_queue(ahd, dev);
}

static __inline struct ahd_linux_device *
ahd_linux_next_device_to_run(struct ahd_softc *ahd)
{
	
	if ((ahd->flags & AHD_RESOURCE_SHORTAGE) != 0
	 || (ahd->platform_data->qfrozen != 0
	  && AHD_DV_SIMQ_FROZEN(ahd) == 0))
		return (NULL);
	return (TAILQ_FIRST(&ahd->platform_data->device_runq));
}

static __inline void
ahd_linux_run_device_queues(struct ahd_softc *ahd)
{
	struct ahd_linux_device *dev;

	while ((dev = ahd_linux_next_device_to_run(ahd)) != NULL) {
		TAILQ_REMOVE(&ahd->platform_data->device_runq, dev, links);
		dev->flags &= ~AHD_DEV_ON_RUN_LIST;
		ahd_linux_check_device_queue(ahd, dev);
	}
}

static __inline void
ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
{
	Scsi_Cmnd *cmd;
	int direction;

	cmd = scb->io_ctx;
	direction = scsi_to_pci_dma_dir(cmd->sc_data_direction);
	ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
	if (cmd->use_sg != 0) {
		struct scatterlist *sg;

		sg = (struct scatterlist *)cmd->request_buffer;
		pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
	} else if (cmd->request_bufflen != 0) {
		pci_unmap_single(ahd->dev_softc,
				 scb->platform_data->buf_busaddr,
				 cmd->request_bufflen, direction);
	}
}

/******************************** Macros **************************************/
#define BUILD_SCSIID(ahd, cmd)						\
	((((cmd)->device->id << TID_SHIFT) & TID) | (ahd)->our_id)

/************************  Host template entry points *************************/
static int	   ahd_linux_detect(Scsi_Host_Template *);
static const char *ahd_linux_info(struct Scsi_Host *);
static int	   ahd_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int	   ahd_linux_slave_alloc(Scsi_Device *);
static int	   ahd_linux_slave_configure(Scsi_Device *);
static void	   ahd_linux_slave_destroy(Scsi_Device *);
#if defined(__i386__)
static int	   ahd_linux_biosparam(struct scsi_device*,
				       struct block_device*, sector_t, int[]);
#endif
#else
static int	   ahd_linux_release(struct Scsi_Host *);
static void	   ahd_linux_select_queue_depth(struct Scsi_Host *host,
						Scsi_Device *scsi_devs);
#if defined(__i386__)
static int	   ahd_linux_biosparam(Disk *, kdev_t, int[]);
#endif
#endif
static int	   ahd_linux_bus_reset(Scsi_Cmnd *);
static int	   ahd_linux_dev_reset(Scsi_Cmnd *);
static int	   ahd_linux_abort(Scsi_Cmnd *);

/*
 * Calculate a safe value for AHD_NSEG (as expressed through ahd_linux_nseg).
 *
 * In pre-2.5.X...
 * The midlayer allocates an S/G array dynamically when a command is issued
 * using SCSI malloc.  This array, which is in an OS dependent format that
 * must later be copied to our private S/G list, is sized to house just the
 * number of segments needed for the current transfer.  Since the code that
 * sizes the SCSI malloc pool does not take into consideration fragmentation
 * of the pool, executing transactions numbering just a fraction of our
 * concurrent transaction limit with SG list lengths aproaching AHC_NSEG will
 * quickly depleat the SCSI malloc pool of usable space.  Unfortunately, the
 * mid-layer does not properly handle this scsi malloc failures for the S/G
 * array and the result can be a lockup of the I/O subsystem.  We try to size
 * our S/G list so that it satisfies our drivers allocation requirements in
 * addition to avoiding fragmentation of the SCSI malloc pool.
 */
static void
ahd_linux_size_nseg(void)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	u_int cur_size;
	u_int best_size;

	/*
	 * The SCSI allocator rounds to the nearest 512 bytes
	 * an cannot allocate across a page boundary.  Our algorithm
	 * is to start at 1K of scsi malloc space per-command and
	 * loop through all factors of the PAGE_SIZE and pick the best.
	 */
	best_size = 0;
	for (cur_size = 1024; cur_size <= PAGE_SIZE; cur_size *= 2) {
		u_int nseg;

		nseg = cur_size / sizeof(struct scatterlist);
		if (nseg < AHD_LINUX_MIN_NSEG)
			continue;

		if (best_size == 0) {
			best_size = cur_size;
			ahd_linux_nseg = nseg;
		} else {
			u_int best_rem;
			u_int cur_rem;

			/*
			 * Compare the traits of the current "best_size"
			 * with the current size to determine if the
			 * current size is a better size.
			 */
			best_rem = best_size % sizeof(struct scatterlist);
			cur_rem = cur_size % sizeof(struct scatterlist);
			if (cur_rem < best_rem) {
				best_size = cur_size;
				ahd_linux_nseg = nseg;
			}
		}
	}
#endif
}

/*
 * Try to detect an Adaptec 79XX controller.
 */
static int
ahd_linux_detect(Scsi_Host_Template *template)
{
	struct	ahd_softc *ahd;
	int     found;
	int	error = 0;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	/*
	 * It is a bug that the upper layer takes
	 * this lock just prior to calling us.
	 */
	spin_unlock_irq(&io_request_lock);
#endif

	/*
	 * Sanity checking of Linux SCSI data structures so
	 * that some of our hacks^H^H^H^H^Hassumptions aren't
	 * violated.
	 */
	if (offsetof(struct ahd_cmd_internal, end)
	  > offsetof(struct scsi_cmnd, host_scribble)) {
		printf("ahd_linux_detect: SCSI data structures changed.\n");
		printf("ahd_linux_detect: Unable to attach\n");
		return (0);
	}
	/*
	 * Determine an appropriate size for our Scatter Gatther lists.
	 */
	ahd_linux_size_nseg();
#ifdef MODULE
	/*
	 * If we've been passed any parameters, process them now.
	 */
	if (aic79xx)
		aic79xx_setup(aic79xx);
#endif

	template->proc_name = "aic79xx";

	/*
	 * Initialize our softc list lock prior to
	 * probing for any adapters.
	 */
	ahd_list_lockinit();

#ifdef CONFIG_PCI
	error = ahd_linux_pci_init();
	if (error)
		return error;
#endif

	/*
	 * Register with the SCSI layer all
	 * controllers we've found.
	 */
	found = 0;
	TAILQ_FOREACH(ahd, &ahd_tailq, links) {

		if (ahd_linux_register_host(ahd, template) == 0)
			found++;
	}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	spin_lock_irq(&io_request_lock);
#endif
	aic79xx_detect_complete++;
	return 0;
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
/*
 * Free the passed in Scsi_Host memory structures prior to unloading the
 * module.
 */
static int
ahd_linux_release(struct Scsi_Host * host)
{
	struct ahd_softc *ahd;
	u_long l;

	ahd_list_lock(&l);
	if (host != NULL) {

		/*
		 * We should be able to just perform