aic7xxx_osm.c

优龙2410linux2.6.8内核源代码

 * write wild stuff into our code segment
 */
static char dummy_buffer[60] = "Please don't trounce on me insmod!!\n";

MODULE_AUTHOR("Maintainer: Justin T. Gibbs <[e-mail]>");
MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif
MODULE_PARM(aic7xxx, "s");
MODULE_PARM_DESC(aic7xxx,
"period delimited, options string.\n"
"	verbose			Enable verbose/diagnostic logging\n"
"	allow_memio		Allow device registers to be memory mapped\n"
"	debug			Bitmask of debug values to enable\n"
"	no_probe		Toggle EISA/VLB controller probing\n"
"	probe_eisa_vl		Toggle EISA/VLB controller probing\n"
"	no_reset		Supress initial bus resets\n"
"	extended		Enable extended geometry on all controllers\n"
"	periodic_otag		Send an ordered tagged transaction\n"
"				periodically to prevent tag starvation.\n"
"				This may be required by some older disk\n"
"				drives or RAID arrays.\n"
"	reverse_scan		Sort PCI devices highest Bus/Slot to lowest\n"
"	tag_info:<tag_str>	Set per-target tag depth\n"
"	global_tag_depth:<int>	Global tag depth for every target\n"
"				on every bus\n"
"	dv:<dv_settings>	Set per-controller Domain Validation Setting.\n"
"	seltime:<int>		Selection Timeout\n"
"				(0/256ms,1/128ms,2/64ms,3/32ms)\n"
"\n"
"	Sample /etc/modprobe.conf line:\n"
"		Toggle EISA/VLB probing\n"
"		Set tag depth on Controller 1/Target 1 to 10 tags\n"
"		Shorten the selection timeout to 128ms\n"
"\n"
"	options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
);
#endif

static void ahc_linux_handle_scsi_status(struct ahc_softc *,
					 struct ahc_linux_device *,
					 struct scb *);
static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
					 Scsi_Cmnd *cmd);
static void ahc_linux_filter_inquiry(struct ahc_softc*, struct ahc_devinfo*);
static void ahc_linux_sem_timeout(u_long arg);
static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
static void ahc_linux_release_simq(u_long arg);
static void ahc_linux_dev_timed_unfreeze(u_long arg);
static int  ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag);
static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
static void ahc_linux_size_nseg(void);
static void ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc);
static void ahc_linux_start_dv(struct ahc_softc *ahc);
static void ahc_linux_dv_timeout(struct scsi_cmnd *cmd);
static int  ahc_linux_dv_thread(void *data);
static void ahc_linux_kill_dv_thread(struct ahc_softc *ahc);
static void ahc_linux_dv_target(struct ahc_softc *ahc, u_int target);
static void ahc_linux_dv_transition(struct ahc_softc *ahc,
				    struct scsi_cmnd *cmd,
				    struct ahc_devinfo *devinfo,
				    struct ahc_linux_target *targ);
static void ahc_linux_dv_fill_cmd(struct ahc_softc *ahc,
				  struct scsi_cmnd *cmd,
				  struct ahc_devinfo *devinfo);
static void ahc_linux_dv_inq(struct ahc_softc *ahc,
			     struct scsi_cmnd *cmd,
			     struct ahc_devinfo *devinfo,
			     struct ahc_linux_target *targ,
			     u_int request_length);
static void ahc_linux_dv_tur(struct ahc_softc *ahc,
			     struct scsi_cmnd *cmd,
			     struct ahc_devinfo *devinfo);
static void ahc_linux_dv_rebd(struct ahc_softc *ahc,
			      struct scsi_cmnd *cmd,
			      struct ahc_devinfo *devinfo,
			      struct ahc_linux_target *targ);
static void ahc_linux_dv_web(struct ahc_softc *ahc,
			     struct scsi_cmnd *cmd,
			     struct ahc_devinfo *devinfo,
			     struct ahc_linux_target *targ);
static void ahc_linux_dv_reb(struct ahc_softc *ahc,
			     struct scsi_cmnd *cmd,
			     struct ahc_devinfo *devinfo,
			     struct ahc_linux_target *targ);
static void ahc_linux_dv_su(struct ahc_softc *ahc,
			    struct scsi_cmnd *cmd,
			    struct ahc_devinfo *devinfo,
			    struct ahc_linux_target *targ);
static int ahc_linux_fallback(struct ahc_softc *ahc,
			      struct ahc_devinfo *devinfo);
static void ahc_linux_dv_complete(Scsi_Cmnd *cmd);
static void ahc_linux_generate_dv_pattern(struct ahc_linux_target *targ);
static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
				     struct ahc_devinfo *devinfo);
static u_int ahc_linux_user_dv_setting(struct ahc_softc *ahc);
static void ahc_linux_device_queue_depth(struct ahc_softc *ahc,
					 struct ahc_linux_device *dev);
static struct ahc_linux_target*	ahc_linux_alloc_target(struct ahc_softc*,
						       u_int, u_int);
static void			ahc_linux_free_target(struct ahc_softc*,
						      struct ahc_linux_target*);
static struct ahc_linux_device*	ahc_linux_alloc_device(struct ahc_softc*,
						       struct ahc_linux_target*,
						       u_int);
static void			ahc_linux_free_device(struct ahc_softc*,
						      struct ahc_linux_device*);
static void ahc_linux_run_device_queue(struct ahc_softc*,
				       struct ahc_linux_device*);
static void ahc_linux_setup_tag_info_global(char *p);
static aic_option_callback_t ahc_linux_setup_tag_info;
static aic_option_callback_t ahc_linux_setup_dv;
static int  aic7xxx_setup(char *s);
static int  ahc_linux_next_unit(void);
static void ahc_runq_tasklet(unsigned long data);
static struct ahc_cmd *ahc_linux_run_complete_queue(struct ahc_softc *ahc);

/********************************* Inlines ************************************/
static __inline void ahc_schedule_runq(struct ahc_softc *ahc);
static __inline struct ahc_linux_device*
		     ahc_linux_get_device(struct ahc_softc *ahc, u_int channel,
					  u_int target, u_int lun, int alloc);
static __inline void ahc_schedule_completeq(struct ahc_softc *ahc);
static __inline void ahc_linux_check_device_queue(struct ahc_softc *ahc,
						  struct ahc_linux_device *dev);
static __inline struct ahc_linux_device *
		     ahc_linux_next_device_to_run(struct ahc_softc *ahc);
static __inline void ahc_linux_run_device_queues(struct ahc_softc *ahc);
static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);

static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
		 		      struct ahc_dma_seg *sg,
				      bus_addr_t addr, bus_size_t len);

static __inline void
ahc_schedule_completeq(struct ahc_softc *ahc)
{
	if ((ahc->platform_data->flags & AHC_RUN_CMPLT_Q_TIMER) == 0) {
		ahc->platform_data->flags |= AHC_RUN_CMPLT_Q_TIMER;
		ahc->platform_data->completeq_timer.expires = jiffies;
		add_timer(&ahc->platform_data->completeq_timer);
	}
}

/*
 * Must be called with our lock held.
 */
static __inline void
ahc_schedule_runq(struct ahc_softc *ahc)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	tasklet_schedule(&ahc->platform_data->runq_tasklet);
#else
	/*
	 * Tasklets are not available, so run inline.
	 */
	ahc_runq_tasklet((unsigned long)ahc);
#endif
}

static __inline struct ahc_linux_device*
ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, u_int target,
		     u_int lun, int alloc)
{
	struct ahc_linux_target *targ;
	struct ahc_linux_device *dev;
	u_int target_offset;

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

#define AHC_LINUX_MAX_RETURNED_ERRORS 4
static struct ahc_cmd *
ahc_linux_run_complete_queue(struct ahc_softc *ahc)
{
	struct	ahc_cmd *acmd;
	u_long	done_flags;
	int	with_errors;

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

		if (with_errors > AHC_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"
			 */
			ahc_schedule_completeq(ahc);
			break;
		}
		TAILQ_REMOVE(&ahc->platform_data->completeq,
			     acmd, acmd_links.tqe);
		cmd = &acmd_scsi_cmd(acmd);
		cmd->host_scribble = NULL;
		if (ahc_cmd_get_transaction_status(cmd) != DID_OK
		 || (cmd->result & 0xFF) != SCSI_STATUS_OK)
			with_errors++;

		cmd->scsi_done(cmd);
	}
	ahc_done_unlock(ahc, &done_flags);
	return (acmd);
}

static __inline void
ahc_linux_check_device_queue(struct ahc_softc *ahc,
			     struct ahc_linux_device *dev)
{
	if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) != 0
	 && dev->active == 0) {
		dev->flags &= ~AHC_DEV_FREEZE_TIL_EMPTY;
		dev->qfrozen--;
	}

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

	ahc_linux_run_device_queue(ahc, dev);
}

static __inline struct ahc_linux_device *
ahc_linux_next_device_to_run(struct ahc_softc *ahc)
{
	
	if ((ahc->flags & AHC_RESOURCE_SHORTAGE) != 0
	 || (ahc->platform_data->qfrozen != 0
	  && AHC_DV_SIMQ_FROZEN(ahc) == 0))
		return (NULL);
	return (TAILQ_FIRST(&ahc->platform_data->device_runq));
}

static __inline void
ahc_linux_run_device_queues(struct ahc_softc *ahc)
{
	struct ahc_linux_device *dev;

	while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) {
		TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links);
		dev->flags &= ~AHC_DEV_ON_RUN_LIST;
		ahc_linux_check_device_queue(ahc, dev);
	}
}

static __inline void
ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
{
	Scsi_Cmnd *cmd;

	cmd = scb->io_ctx;
	ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
	if (cmd->use_sg != 0) {
		struct scatterlist *sg;

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

static __inline int
ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
		  struct ahc_dma_seg *sg, bus_addr_t addr, bus_size_t len)
{
	int	 consumed;

	if ((scb->sg_count + 1) > AHC_NSEG)
		panic("Too few segs for dma mapping.  "
		      "Increase AHC_NSEG\n");

	consumed = 1;
	sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
	scb->platform_data->xfer_len += len;

	if (sizeof(bus_addr_t) > 4
	 && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
		len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;

	sg->len = ahc_htole32(len);
	return (consumed);
}

/************************  Host template entry points *************************/
static int	   ahc_linux_detect(Scsi_Host_Template *);
static int	   ahc_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *));
static const char *ahc_linux_info(struct Scsi_Host *);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int	   ahc_linux_slave_alloc(Scsi_Device *);
static int	   ahc_linux_slave_configure(Scsi_Device *);
static void	   ahc_linux_slave_destroy(Scsi_Device *);
#if defined(__i386__)
static int	   ahc_linux_biosparam(struct scsi_device*,
				       struct block_device*,
				       sector_t, int[]);
#endif
#else
static int	   ahc_linux_release(struct Scsi_Host *);
static void	   ahc_linux_select_queue_depth(struct Scsi_Host *host,
						Scsi_Device *scsi_devs);
#if defined(__i386__)
static int	   ahc_linux_biosparam(Disk *, kdev_t, int[]);
#endif
#endif
static int	   ahc_linux_bus_reset(Scsi_Cmnd *);
static int	   ahc_linux_dev_reset(Scsi_Cmnd *);
static int	   ahc_linux_abort(Scsi_Cmnd *);

/*
 * Calculate a safe value for AHC_NSEG (as expressed through ahc_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 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
ahc_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 < AHC_LINUX_MIN_NSEG)
			continue;

		if (best_size == 0) {
			best_size = cur_size;
			ahc_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;
				ahc_linux_nseg = nseg;
			}
		}
	}
#endif
}

/*
 * Try to detect an Adaptec 7XXX controller.
 */
static int
ahc_linux_detect(Scsi_Host_Template *template)
{
	struct	ahc_softc *ahc;
	int     found = 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 ahc_cmd_internal, end)
	  > offsetof(struct scsi_cmnd, host_scribble)) {
		printf("ahc_linux_detect: SCSI data structures changed.\n");
		printf("ahc_linux_detect: Unable to attach\n");
		return (0);
	}
	ahc_linux_size_nseg();
#ifdef MODULE
	/*
	 * If we've been passed any parameters, process them now.
	 */
	if (aic7xxx)
		aic7xxx_setup(aic7xxx);
	if (dummy_buffer[0] != 'P')
		printk(KERN_WARNING
"aic7xxx: Please read the file /usr/src/linux/drivers/scsi/README.aic7xxx\n"
"aic7xxx: to see the proper way to specify options to the aic7xxx module\n"
"aic7xxx: Specifically, don't use any commas when passing arguments to\n"
"aic7xxx: insmod or else it might trash certain memory areas.\n");
#endif

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)
	template->proc_name = "aic7xxx";
#else
	template->proc_dir = &proc_scsi_aic7xxx;
#endif