qdio.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 2,574 行 · 第 1/5 页

	 */
	if (q->is_thinint_q)
		tiqdio_set_summary_bit((__u32*)q->dev_st_chg_ind);
	return 0;

#else /* QDIO_USE_PROCESSING_STATE */
	return 1;
#endif /* QDIO_USE_PROCESSING_STATE */
}

/* 
 * see the comment in do_QDIO and before qdio_reserve_q about the
 * sophisticated locking outside of unmark_q, so that we don't need to
 * disable the interrupts :-) 
*/
static inline void
qdio_unmark_q(struct qdio_q *q)
{
	unsigned long flags;

	QDIO_DBF_TEXT4(0,trace,"unmark q");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));

	if ((!q->list_prev)||(!q->list_next))
		return;

	if ((q->is_thinint_q)&&(q->is_input_q)) {
		/* iQDIO */
		spin_lock_irqsave(&ttiq_list_lock,flags);
		/* in case cleanup has done this already and simultanously
		 * qdio_unmark_q is called from the interrupt handler, we've
		 * got to check this in this specific case again */
		if ((!q->list_prev)||(!q->list_next))
			goto out;
		if (q->list_next==q) {
			/* q was the only interesting q */
			tiq_list=NULL;
			q->list_next=NULL;
			q->list_prev=NULL;
		} else {
			q->list_next->list_prev=q->list_prev;
			q->list_prev->list_next=q->list_next;
			tiq_list=q->list_next;
			q->list_next=NULL;
			q->list_prev=NULL;
		}
out:
		spin_unlock_irqrestore(&ttiq_list_lock,flags);
	}
}

static inline unsigned long 
tiqdio_clear_global_summary(void)
{
	unsigned long time;

	QDIO_DBF_TEXT5(0,trace,"clrglobl");
	
	time = do_clear_global_summary();

	QDIO_DBF_HEX5(0,trace,&time,sizeof(unsigned long));

	return time;
}


/************************* OUTBOUND ROUTINES *******************************/
static int
qdio_qebsm_get_outbound_buffer_frontier(struct qdio_q *q)
{
        struct qdio_irq *irq;
        unsigned char state;
        unsigned int cnt, count, ftc;

        irq = (struct qdio_irq *) q->irq_ptr;
        if ((!q->is_iqdio_q) && (!q->hydra_gives_outbound_pcis))
                SYNC_MEMORY;

        ftc = q->first_to_check;
        count = qdio_min(atomic_read(&q->number_of_buffers_used),
                        (QDIO_MAX_BUFFERS_PER_Q-1));
        if (count == 0)
                return q->first_to_check;
        cnt = qdio_do_eqbs(q, &state, &ftc, &count);
        if (cnt == 0)
                return q->first_to_check;
        switch (state) {
        case SLSB_P_OUTPUT_ERROR:
                QDIO_DBF_TEXT3(0,trace,"outperr");
                atomic_sub(cnt , &q->number_of_buffers_used);
                if (q->qdio_error)
                        q->error_status_flags |=
                                QDIO_STATUS_MORE_THAN_ONE_QDIO_ERROR;
                q->qdio_error = SLSB_P_OUTPUT_ERROR;
                q->error_status_flags |= QDIO_STATUS_LOOK_FOR_ERROR;
                q->first_to_check = ftc;
                break;
        case SLSB_P_OUTPUT_EMPTY:
                QDIO_DBF_TEXT5(0,trace,"outpempt");
                atomic_sub(cnt, &q->number_of_buffers_used);
                q->first_to_check = ftc;
                break;
        case SLSB_CU_OUTPUT_PRIMED:
                /* all buffers primed */
                QDIO_DBF_TEXT5(0,trace,"outpprim");
                break;
        default:
                break;
        }
        QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));
        return q->first_to_check;
}

static int
qdio_qebsm_get_inbound_buffer_frontier(struct qdio_q *q)
{
        struct qdio_irq *irq;
        unsigned char state;
        int tmp, ftc, count, cnt;
        char dbf_text[15];


        irq = (struct qdio_irq *) q->irq_ptr;
        ftc = q->first_to_check;
        count = qdio_min(atomic_read(&q->number_of_buffers_used),
                        (QDIO_MAX_BUFFERS_PER_Q-1));
        if (count == 0)
                 return q->first_to_check;
        cnt = qdio_do_eqbs(q, &state, &ftc, &count);
        if (cnt == 0)
                 return q->first_to_check;
        switch (state) {
        case SLSB_P_INPUT_ERROR :
#ifdef CONFIG_QDIO_DEBUG
                QDIO_DBF_TEXT3(1,trace,"inperr");
                sprintf(dbf_text,"%2x,%2x",ftc,count);
                QDIO_DBF_TEXT3(1,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
                if (q->qdio_error)
                        q->error_status_flags |=
                                QDIO_STATUS_MORE_THAN_ONE_QDIO_ERROR;
                q->qdio_error = SLSB_P_INPUT_ERROR;
                q->error_status_flags |= QDIO_STATUS_LOOK_FOR_ERROR;
                atomic_sub(cnt, &q->number_of_buffers_used);
                q->first_to_check = ftc;
                break;
        case SLSB_P_INPUT_PRIMED :
                QDIO_DBF_TEXT3(0,trace,"inptprim");
                sprintf(dbf_text,"%2x,%2x",ftc,count);
                QDIO_DBF_TEXT3(1,trace,dbf_text);
                tmp = 0;
                ftc = q->first_to_check;
#ifdef QDIO_USE_PROCESSING_STATE
		if (cnt > 1) {
			cnt -= 1;
			tmp = set_slsb(q, &ftc, SLSB_P_INPUT_NOT_INIT, &cnt);
			if (!tmp)
				break;
		}
		cnt = 1;
		tmp += set_slsb(q, &ftc,
			       SLSB_P_INPUT_PROCESSING, &cnt);
		atomic_set(&q->polling, 1);
#else
                tmp = set_slsb(q, &ftc, SLSB_P_INPUT_NOT_INIT, &cnt);
#endif
                atomic_sub(tmp, &q->number_of_buffers_used);
                q->first_to_check = ftc;
                break;
        case SLSB_CU_INPUT_EMPTY:
        case SLSB_P_INPUT_NOT_INIT:
        case SLSB_P_INPUT_PROCESSING:
                QDIO_DBF_TEXT5(0,trace,"inpnipro");
                break;
        default:
                break;
        }
        QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));
        return q->first_to_check;
}

static inline int
qdio_get_outbound_buffer_frontier(struct qdio_q *q)
{
	struct qdio_irq *irq;
        volatile char *slsb;
        unsigned int count = 1;
        int first_not_to_check, f, f_mod_no;
	char dbf_text[15];

	QDIO_DBF_TEXT4(0,trace,"getobfro");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));

	irq = (struct qdio_irq *) q->irq_ptr;
	if (irq->is_qebsm)
		return qdio_qebsm_get_outbound_buffer_frontier(q);

	slsb=&q->slsb.acc.val[0];
	f_mod_no=f=q->first_to_check;
	/* 
	 * f points to already processed elements, so f+no_used is correct...
	 * ... but: we don't check 128 buffers, as otherwise
	 * qdio_has_outbound_q_moved would return 0 
	 */
	first_not_to_check=f+qdio_min(atomic_read(&q->number_of_buffers_used),
				      (QDIO_MAX_BUFFERS_PER_Q-1));

	if ((!q->is_iqdio_q)&&(!q->hydra_gives_outbound_pcis))
		SYNC_MEMORY;

check_next:
	if (f==first_not_to_check) 
		goto out;

	switch(slsb[f_mod_no]) {

        /* the adapter has not fetched the output yet */
	case SLSB_CU_OUTPUT_PRIMED:
		QDIO_DBF_TEXT5(0,trace,"outpprim");
		break;

	/* the adapter got it */
	case SLSB_P_OUTPUT_EMPTY:
		atomic_dec(&q->number_of_buffers_used);
		f++;
		f_mod_no=f&(QDIO_MAX_BUFFERS_PER_Q-1);
		QDIO_DBF_TEXT5(0,trace,"outpempt");
		goto check_next;

	case SLSB_P_OUTPUT_ERROR:
		QDIO_DBF_TEXT3(0,trace,"outperr");
		sprintf(dbf_text,"%x-%x-%x",f_mod_no,
			q->sbal[f_mod_no]->element[14].sbalf.value,
			q->sbal[f_mod_no]->element[15].sbalf.value);
		QDIO_DBF_TEXT3(1,trace,dbf_text);
		QDIO_DBF_HEX2(1,sbal,q->sbal[f_mod_no],256);

		/* kind of process the buffer */
		set_slsb(q, &f_mod_no, SLSB_P_OUTPUT_NOT_INIT, &count);

		/* 
		 * we increment the frontier, as this buffer
		 * was processed obviously 
		 */
		atomic_dec(&q->number_of_buffers_used);
		f_mod_no=(f_mod_no+1)&(QDIO_MAX_BUFFERS_PER_Q-1);

		if (q->qdio_error)
			q->error_status_flags|=
				QDIO_STATUS_MORE_THAN_ONE_QDIO_ERROR;
		q->qdio_error=SLSB_P_OUTPUT_ERROR;
		q->error_status_flags|=QDIO_STATUS_LOOK_FOR_ERROR;

		break;

	/* no new buffers */
	default:
		QDIO_DBF_TEXT5(0,trace,"outpni");
	}
out:
	return (q->first_to_check=f_mod_no);
}

/* all buffers are processed */
static inline int
qdio_is_outbound_q_done(struct qdio_q *q)
{
	int no_used;
#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];
#endif

	no_used=atomic_read(&q->number_of_buffers_used);

#ifdef CONFIG_QDIO_DEBUG
	if (no_used) {
		sprintf(dbf_text,"oqisnt%02x",no_used);
		QDIO_DBF_TEXT4(0,trace,dbf_text);
	} else {
		QDIO_DBF_TEXT4(0,trace,"oqisdone");
	}
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
#endif /* CONFIG_QDIO_DEBUG */
	return (no_used==0);
}

static inline int
qdio_has_outbound_q_moved(struct qdio_q *q)
{
	int i;

	i=qdio_get_outbound_buffer_frontier(q);

	if ( (i!=GET_SAVED_FRONTIER(q)) ||
	     (q->error_status_flags&QDIO_STATUS_LOOK_FOR_ERROR) ) {
		SAVE_FRONTIER(q,i);
		QDIO_DBF_TEXT4(0,trace,"oqhasmvd");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		return 1;
	} else {
		QDIO_DBF_TEXT4(0,trace,"oqhsntmv");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		return 0;
	}
}

static inline void
qdio_kick_outbound_q(struct qdio_q *q)
{
	int result;
#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];

	QDIO_DBF_TEXT4(0,trace,"kickoutq");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
#endif /* CONFIG_QDIO_DEBUG */

	if (!q->siga_out)
		return;

	/* here's the story with cc=2 and busy bit set (thanks, Rick):
	 * VM's CP could present us cc=2 and busy bit set on SIGA-write
	 * during reconfiguration of their Guest LAN (only in HIPERS mode,
	 * QDIO mode is asynchronous -- cc=2 and busy bit there will take
	 * the queues down immediately; and not being under VM we have a
	 * problem on cc=2 and busy bit set right away).
	 *
	 * Therefore qdio_siga_output will try for a short time constantly,
	 * if such a condition occurs. If it doesn't change, it will
	 * increase the busy_siga_counter and save the timestamp, and
	 * schedule the queue for later processing (via mark_q, using the
	 * queue tasklet). __qdio_outbound_processing will check out the
	 * counter. If non-zero, it will call qdio_kick_outbound_q as often
	 * as the value of the counter. This will attempt further SIGA
	 * instructions. For each successful SIGA, the counter is
	 * decreased, for failing SIGAs the counter remains the same, after
	 * all.
	 * After some time of no movement, qdio_kick_outbound_q will
	 * finally fail and reflect corresponding error codes to call
	 * the upper layer module and have it take the queues down.
	 *
	 * Note that this is a change from the original HiperSockets design
	 * (saying cc=2 and busy bit means take the queues down), but in
	 * these days Guest LAN didn't exist... excessive cc=2 with busy bit
	 * conditions will still take the queues down, but the threshold is
	 * higher due to the Guest LAN environment.
	 */


	result=qdio_siga_output(q);

	switch (result) {
	case 0:
		/* went smooth this time, reset timestamp */
#ifdef CONFIG_QDIO_DEBUG
		QDIO_DBF_TEXT3(0,trace,"cc2reslv");
		sprintf(dbf_text,"%4x%2x%2x",q->schid.sch_no,q->q_no,
			atomic_read(&q->busy_siga_counter));
		QDIO_DBF_TEXT3(0,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
		q->timing.busy_start=0;
		break;
	case (2|QDIO_SIGA_ERROR_B_BIT_SET):
		/* cc=2 and busy bit: */
		atomic_inc(&q->busy_siga_counter);

		/* if the last siga was successful, save
		 * timestamp here */
		if (!q->timing.busy_start)
			q->timing.busy_start=NOW;

		/* if we're in time, don't touch error_status_flags
		 * and siga_error */
		if (NOW-q->timing.busy_start<QDIO_BUSY_BIT_GIVE_UP) {
			qdio_mark_q(q);
			break;
		}
		QDIO_DBF_TEXT2(0,trace,"cc2REPRT");
#ifdef CONFIG_QDIO_DEBUG
		sprintf(dbf_text,"%4x%2x%2x",q->schid.sch_no,q->q_no,
			atomic_read(&q->busy_siga_counter));
		QDIO_DBF_TEXT3(0,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
		/* else fallthrough and report error */
	default:
		/* for plain cc=1, 2 or 3: */
		if (q->siga_error)
			q->error_status_flags|=
				QDIO_STATUS_MORE_THAN_ONE_SIGA_ERROR;
		q->error_status_flags|=
			QDIO_STATUS_LOOK_FOR_ERROR;
		q->siga_error=result;
	}
}

static inline void
qdio_kick_outbound_handler(struct qdio_q *q)
{
	int start, end, real_end, count;
#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];
#endif

	start = q->first_element_to_kick;
	/* last_move_ftc was just updated */
	real_end = GET_SAVED_FRONTIER(q);
	end = (real_end+QDIO_MAX_BUFFERS_PER_Q-1)&
		(QDIO_MAX_BUFFERS_PER_Q-1);
	count = (end+QDIO_MAX_BUFFERS_PER_Q+1-start)&
		(QDIO_MAX_BUFFERS_PER_Q-1);

#ifdef CONFIG_QDIO_DEBUG
	QDIO_DBF_TEXT4(0,trace,"kickouth");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));

	sprintf(dbf_text,"s=%2xc=%2x",start,count);
	QDIO_DBF_TEXT4(0,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */

	if (q->state==QDIO_IRQ_STATE_ACTIVE)
		q->handler(q->cdev,QDIO_STATUS_OUTBOUND_INT|
			   q->error_status_flags,
			   q->qdio_error,q->siga_error,q->q_no,start,count,
			   q->int_parm);

	/* for the next time: */
	q->first_element_to_kick=real_end;
	q->qdio_error=0;
	q->siga_error=0;
	q->error_status_flags=0;
}

static inline void
__qdio_outbound_processing(struct qdio_q *q)
{
	int siga_attempts;

	QDIO_DBF_TEXT4(0,trace,"qoutproc");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));

	if (unlikely(qdio_reserve_q(q))) {
		qdio_release_q(q);
#ifdef QDIO_PERFORMANCE_STATS
		o_p_c++;
#endif /* QDIO_PERFORMANCE_STATS */
		/* as we're sissies, we'll check next time */
		if (likely(!atomic_read(&q->is_in_shutdown))) {
			qdio_mark_q(q);
			QDIO_DBF_TEXT4(0,trace,"busy,agn");
		}
		return;
	}
#ifdef QDIO_PERFORMANCE_STATS
	o_p_nc++;
	perf_stats.tl_runs++;
#endif /* QDIO_PERFORMANCE_STATS */

	/* see comment in qdio_kick_outbound_q */
	siga_attempts=atomic_read(&q->busy_siga_counter);
	while (siga_attempts) {
		atomic_dec(&q->busy_siga_counter);
		qdio_kick_outbound_q(q);
		siga_attempts--;
	}

	if (qdio_has_outbound_q_moved(q))
		qdio_kick_outbound_handler(q);

	if (q->is_iqdio_q) {
		/* 
		 * for asynchronous queues, we better check, if the fill
		 * level is too high. for synchronous queues, the fill
		 * level will never be that high. 
		 */
		if (atomic_read(&q->number_of_buffers_used)>
		    IQDIO_FILL_LEVEL_TO_POLL)
			qdio_mark_q(q);

	} else if (!q->hydra_gives_outbound_pcis)
		if (!qdio_is_outbound_q_done(q))
			qdio_mark_q(q);

	qdio_release_q(q);
}

static void
qdio_outbound_processing(struct qdio_q *q)
{
	__qdio_outbound_processing(q);
}

/************************* INBOUND ROUTINES *******************************/


static inline int
qdio_get_inbound_buffer_frontier(struct qdio_q *q)
{
	struct qdio_irq *irq;
	int f,f_mod_no;
	volatile char *slsb;
	unsigned int count = 1;
	int first_not_to_check;
#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];
#endif /* CONFIG_QDIO_DEBUG */
#ifdef QDIO_USE_PROCESSING_STATE
	int last_position=-1;
#endif /* QDIO_USE_PROCESSING_STATE */

	QDIO_DBF_TEXT4(0,trace,"getibfro");
	QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));

	irq = (struct qdio_irq *) q->irq_ptr;
	if (irq->is_qebsm)
		return qdio_qebsm_get_inbound_buffer_frontier(q);