aic79xx_osm.c

一个2.4.21版本的嵌入式linux内核

"		Enable verbose logging\n"
"		Set tag depth on Controller 2/Target 2 to 10 tags\n"
"		Shorten the selection timeout to 128ms\n"
"\n"
"	options aic79xx='\"verbose.tag_info:{{}.{}.{..10}}.seltime:1\"'\n"
"\n"
"	Sample /etc/modules.conf line:\n"
"		Change Read Streaming for Controller's 2 and 3\n"
"\n"
"	options aic79xx='\"rd_strm:{..0xFFF0.0xC0F0}\"'");
#endif

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_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_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 __inline int
	   ahd_linux_dv_fallback(struct ahd_softc *ahd,
				 struct ahd_devinfo *devinfo);
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_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(char *p, char *end, char *s);
static void ahd_linux_setup_tag_info_global(char *p);
static void ahd_linux_setup_rd_strm_info(char *p, char *end, char *s);
static void ahd_linux_setup_dv(char *p, char *end, char *s);
static void ahd_linux_setup_iocell_info(char *p, char *end, char *s, int index);
static int ahd_linux_next_unit(void);
static void ahd_runq_tasklet(unsigned long data);
static int ahd_linux_halt(struct notifier_block *nb, u_long event, void *buf);
static int aic79xx_setup(char *c);

/****************************** Inlines ***************************************/
static __inline void ahd_schedule_completeq(struct ahd_softc *ahd,
					    struct ahd_cmd *acmd);
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,
						    struct ahd_cmd *acmd);
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 int ahd_linux_map_seg(struct ahd_softc *ahd, struct scb *scb,
		 		      struct ahd_dma_seg *sg,
				      bus_addr_t addr, bus_size_t len);

static __inline void
ahd_schedule_completeq(struct ahd_softc *ahd, struct ahd_cmd *acmd)
{
	while (acmd != NULL) {
		struct ahd_completeq *completeq;
		struct ahd_cmd *list_cmd;
		struct ahd_cmd *next_cmd;

		next_cmd = TAILQ_NEXT(acmd, acmd_links.tqe);
		completeq = &ahd->platform_data->completeq;
		list_cmd = TAILQ_FIRST(completeq);
		while (list_cmd != NULL
		    && acmd_scsi_cmd(list_cmd).serial_number
		     < acmd_scsi_cmd(acmd).serial_number)
			list_cmd = TAILQ_NEXT(list_cmd, acmd_links.tqe);
		if (list_cmd != NULL)
			TAILQ_INSERT_BEFORE(list_cmd, acmd, acmd_links.tqe);
		else
			TAILQ_INSERT_TAIL(completeq, acmd, acmd_links.tqe);
		acmd = next_cmd;
	}
	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);
	}
}

static __inline void
ahd_schedule_runq(struct ahd_softc *ahd)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	tasklet_schedule(&ahd->platform_data->runq_tasklet);
#else
	/*
	 * Tasklets are not available, so run inline.
	 */
	ahd_runq_tasklet((unsigned long)ahd);
#endif
}

static __inline
void ahd_setup_runq_tasklet(struct ahd_softc *ahd)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	tasklet_init(&ahd->platform_data->runq_tasklet, ahd_runq_tasklet,
		     (unsigned long)ahd);
#endif
}

static __inline void
ahd_teardown_runq_tasklet(struct ahd_softc *ahd)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	tasklet_kill(&ahd->platform_data->runq_tasklet);
#endif
}

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;

	ahd_done_lock(ahd, &done_flags);
	with_errors = 0;
	while (acmd != NULL) {
		Scsi_Cmnd *cmd;

		cmd = &acmd_scsi_cmd(acmd);
		acmd = TAILQ_NEXT(acmd, acmd_links.tqe);
		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);

		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"
			 */
			break;
		}
	}
	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);
	}
}

static __inline int
ahd_linux_map_seg(struct ahd_softc *ahd, struct scb *scb,
		  struct ahd_dma_seg *sg, bus_addr_t addr, bus_size_t len)
{
	int	 consumed;

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

	consumed = 1;
	sg->addr = ahd_htole32(addr & 0xFFFFFFFF);
	scb->platform_data->xfer_len += len;
	if (sizeof(bus_addr_t) > 4
	 && (ahd->flags & AHD_39BIT_ADDRESSING) != 0) {
		/*
		 * Due to DAC restrictions, we can't
		 * cross a 4GB boundary.
		 */
		if ((addr ^ (addr + len - 1)) & ~0xFFFFFFFF) {
			struct	 ahd_dma_seg *next_sg;
			uint32_t next_len;

			printf("Crossed Seg\n");
			if ((scb->sg_count + 2) > AHD_NSEG)
				panic("Too few segs for dma mapping.  "
				      "Increase AHD_NSEG\n");

			consumed++;
			next_sg = sg + 1;
			next_sg->addr = 0;
			next_len = 0x100000000 - (addr & 0xFFFFFFFF);
			len -= next_len;
			next_len |= ((addr >> 8) + 0x1000000) & 0x7F000000;
			next_sg->len = ahd_htole32(next_len);
		}
		len |= (addr >> 8) & 0x7F000000;
	}
	sg->len = ahd_htole32(len);
	return (consumed);
}

/******************************** 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 int	   ahd_linux_release(struct Scsi_Host *);
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 *);
static int	   ahd_linux_biosparam(struct scsi_device*,
				       struct block_device*, sector_t, int[]);
#else
static void	   ahd_linux_select_queue_depth(struct Scsi_Host *host,
						Scsi_Device *scsi_devs);
static int	   ahd_linux_biosparam(Disk *, kdev_t, int[]);
#endif
static int	   ahd_linux_bus_reset(Scsi_Cmnd *);
static int	   ahd_linux_dev_reset(Scsi_Cmnd *);
static int	   ahd_linux_abort(Scsi_Cmnd *);

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

#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);
	}
#ifdef MODULE
	/*
	 * If we've been passed any parameters, process them now.
	 */
	if (aic79xx)
		aic79xx_setup(aic79xx);
	if (dummy_buffer[0] != 'P')
		printk(KERN_WARNING
"aic79xx: Please read the file /usr/src/linux/drivers/scsi/README.aic79xx\n"
"aic79xx: to see the proper way to specify options to the aic79xx module\n"
"aic79xx: Specifically, don't use any commas when passing arguments to\n"
"aic79xx: insmod or else it might trash certain memory areas.\n");
#endif

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)
	template->proc_name = "aic79xx";
#else
	template->proc_dir = &proc_scsi_aic79xx;
#endif

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

#ifdef CONFIG_PCI
	ahd_linux_pci_probe(template);
#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 (found);
}

/*
 * 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
		 * the free directly, but check our
		 * list for extra sanity.
		 */
		ahd = ahd_find_softc(*(struct ahd_softc **)host->hostdata);
		if (ahd != NULL) {
			u_long s;

			ahd_lock(ahd, &s);
			ahd_intr_enable(ahd, FALSE);
			ahd_unlock(ahd, &s);
			ahd_free(ahd);