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

	slsb=&q->slsb.acc.val[0];
	f_mod_no=f=q->first_to_check;
	/* 
	 * we don't check 128 buffers, as otherwise qdio_has_inbound_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));

	/* 
	 * we don't use this one, as a PCI or we after a thin interrupt
	 * will sync the queues
	 */
	/* SYNC_MEMORY;*/

check_next:
	f_mod_no=f&(QDIO_MAX_BUFFERS_PER_Q-1);
	if (f==first_not_to_check) 
		goto out;
	switch (slsb[f_mod_no]) {

	/* CU_EMPTY means frontier is reached */
	case SLSB_CU_INPUT_EMPTY:
		QDIO_DBF_TEXT5(0,trace,"inptempt");
		break;

	/* P_PRIMED means set slsb to P_PROCESSING and move on */
	case SLSB_P_INPUT_PRIMED:
		QDIO_DBF_TEXT5(0,trace,"inptprim");

#ifdef QDIO_USE_PROCESSING_STATE
		/* 
		 * as soon as running under VM, polling the input queues will
		 * kill VM in terms of CP overhead 
		 */
		if (q->siga_sync) {
			set_slsb(q, &f_mod_no, SLSB_P_INPUT_NOT_INIT, &count);
		} else {
			/* set the previous buffer to NOT_INIT. The current
			 * buffer will be set to PROCESSING at the end of
			 * this function to avoid further interrupts. */
			if (last_position>=0)
				set_slsb(q, &last_position,
					 SLSB_P_INPUT_NOT_INIT, &count);
			atomic_set(&q->polling,1);
			last_position=f_mod_no;
		}
#else /* QDIO_USE_PROCESSING_STATE */
		set_slsb(q, &f_mod_no, SLSB_P_INPUT_NOT_INIT, &count);
#endif /* QDIO_USE_PROCESSING_STATE */
		/* 
		 * not needed, as the inbound queue will be synced on the next
		 * siga-r, resp. tiqdio_is_inbound_q_done will do the siga-s
		 */
		/*SYNC_MEMORY;*/
		f++;
		atomic_dec(&q->number_of_buffers_used);
		goto check_next;

	case SLSB_P_INPUT_NOT_INIT:
	case SLSB_P_INPUT_PROCESSING:
		QDIO_DBF_TEXT5(0,trace,"inpnipro");
		break;

	/* P_ERROR means frontier is reached, break and report error */
	case SLSB_P_INPUT_ERROR:
#ifdef CONFIG_QDIO_DEBUG
		sprintf(dbf_text,"inperr%2x",f_mod_no);
		QDIO_DBF_TEXT3(1,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
		QDIO_DBF_HEX2(1,sbal,q->sbal[f_mod_no],256);

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

		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;

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

#ifdef QDIO_USE_PROCESSING_STATE
		last_position=-1;
#endif /* QDIO_USE_PROCESSING_STATE */

		break;

	/* everything else means frontier not changed (HALTED or so) */
	default: 
		break;
	}
out:
	q->first_to_check=f_mod_no;

#ifdef QDIO_USE_PROCESSING_STATE
	if (last_position>=0)
		set_slsb(q, &last_position, SLSB_P_INPUT_NOT_INIT, &count);
#endif /* QDIO_USE_PROCESSING_STATE */

	QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));

	return q->first_to_check;
}

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

#ifdef QDIO_PERFORMANCE_STATS
	static int old_pcis=0;
	static int old_thinints=0;

	if ((old_pcis==perf_stats.pcis)&&(old_thinints==perf_stats.thinints))
		perf_stats.start_time_inbound=NOW;
	else
		old_pcis=perf_stats.pcis;
#endif /* QDIO_PERFORMANCE_STATS */

	i=qdio_get_inbound_buffer_frontier(q);
	if ( (i!=GET_SAVED_FRONTIER(q)) ||
	     (q->error_status_flags&QDIO_STATUS_LOOK_FOR_ERROR) ) {
		SAVE_FRONTIER(q,i);
		if ((!q->siga_sync)&&(!q->hydra_gives_outbound_pcis))
			SAVE_TIMESTAMP(q);

		QDIO_DBF_TEXT4(0,trace,"inhasmvd");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		return 1;
	} else {
		QDIO_DBF_TEXT4(0,trace,"inhsntmv");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		return 0;
	}
}

/* means, no more buffers to be filled */
static inline int
tiqdio_is_inbound_q_done(struct qdio_q *q)
{
	int no_used;
	unsigned int start_buf, count;
	unsigned char state = 0;
	struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;

#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];
#endif

	no_used=atomic_read(&q->number_of_buffers_used);

	/* propagate the change from 82 to 80 through VM */
	SYNC_MEMORY;

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

	if (!no_used)
		return 1;
	if (!q->siga_sync && !irq->is_qebsm)
		/* we'll check for more primed buffers in qeth_stop_polling */
		return 0;
	if (irq->is_qebsm) {
		count = 1;
		start_buf = q->first_to_check;
		qdio_do_eqbs(q, &state, &start_buf, &count);
	} else
		state = q->slsb.acc.val[q->first_to_check];
	if (state != SLSB_P_INPUT_PRIMED)
		/* 
		 * nothing more to do, if next buffer is not PRIMED.
		 * note that we did a SYNC_MEMORY before, that there
		 * has been a sychnronization.
		 * we will return 0 below, as there is nothing to do
		 * (stop_polling not necessary, as we have not been
		 * using the PROCESSING state 
		 */
		return 0;

	/* 
	 * ok, the next input buffer is primed. that means, that device state 
	 * change indicator and adapter local summary are set, so we will find
	 * it next time.
	 * we will return 0 below, as there is nothing to do, except scheduling
	 * ourselves for the next time. 
	 */
	tiqdio_set_summary_bit((__u32*)q->dev_st_chg_ind);
	tiqdio_sched_tl();
	return 0;
}

static inline int
qdio_is_inbound_q_done(struct qdio_q *q)
{
	int no_used;
	unsigned int start_buf, count;
	unsigned char state = 0;
	struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;

#ifdef CONFIG_QDIO_DEBUG
	char dbf_text[15];
#endif

	no_used=atomic_read(&q->number_of_buffers_used);

	/* 
	 * we need that one for synchronization with the adapter, as it
	 * does a kind of PCI avoidance 
	 */
	SYNC_MEMORY;

	if (!no_used) {
		QDIO_DBF_TEXT4(0,trace,"inqisdnA");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		QDIO_DBF_TEXT4(0,trace,dbf_text);
		return 1;
	}
	if (irq->is_qebsm) {
		count = 1;
		start_buf = q->first_to_check;
		qdio_do_eqbs(q, &state, &start_buf, &count);
	} else
		state = q->slsb.acc.val[q->first_to_check];
	if (state == SLSB_P_INPUT_PRIMED) {
		/* we got something to do */
		QDIO_DBF_TEXT4(0,trace,"inqisntA");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		return 0;
	}

	/* on VM, we don't poll, so the q is always done here */
	if (q->siga_sync)
		return 1;
	if (q->hydra_gives_outbound_pcis)
		return 1;

	/* 
	 * at this point we know, that inbound first_to_check
	 * has (probably) not moved (see qdio_inbound_processing) 
	 */
	if (NOW>GET_SAVED_TIMESTAMP(q)+q->timing.threshold) {
#ifdef CONFIG_QDIO_DEBUG
		QDIO_DBF_TEXT4(0,trace,"inqisdon");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		sprintf(dbf_text,"pf%02xcn%02x",q->first_to_check,no_used);
		QDIO_DBF_TEXT4(0,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
		return 1;
	} else {
#ifdef CONFIG_QDIO_DEBUG
		QDIO_DBF_TEXT4(0,trace,"inqisntd");
		QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
		sprintf(dbf_text,"pf%02xcn%02x",q->first_to_check,no_used);
		QDIO_DBF_TEXT4(0,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
		return 0;
	}
}

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

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

  	start=q->first_element_to_kick;
 	real_end=q->first_to_check;
 	end=(real_end+QDIO_MAX_BUFFERS_PER_Q-1)&(QDIO_MAX_BUFFERS_PER_Q-1);
 
 	i=start;
	count=0;
 	while (1) {
 		count++;
 		if (i==end)
			break;
 		i=(i+1)&(QDIO_MAX_BUFFERS_PER_Q-1);
 	}

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

	if (likely(q->state==QDIO_IRQ_STATE_ACTIVE))
		q->handler(q->cdev,
			   QDIO_STATUS_INBOUND_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;

#ifdef QDIO_PERFORMANCE_STATS
	perf_stats.inbound_time+=NOW-perf_stats.start_time_inbound;
	perf_stats.inbound_cnt++;
#endif /* QDIO_PERFORMANCE_STATS */
}

static inline void
__tiqdio_inbound_processing(struct qdio_q *q, int spare_ind_was_set)
{
	struct qdio_irq *irq_ptr;
	struct qdio_q *oq;
	int i;

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

	/* 
	 * we first want to reserve the q, so that we know, that we don't
	 * interrupt ourselves and call qdio_unmark_q, as is_in_shutdown might
	 * be set 
	 */
	if (unlikely(qdio_reserve_q(q))) {
		qdio_release_q(q);
#ifdef QDIO_PERFORMANCE_STATS
		ii_p_c++;
#endif /* QDIO_PERFORMANCE_STATS */
		/* 
		 * as we might just be about to stop polling, we make
		 * sure that we check again at least once more 
		 */
		tiqdio_sched_tl();
		return;
	}
#ifdef QDIO_PERFORMANCE_STATS
	ii_p_nc++;
#endif /* QDIO_PERFORMANCE_STATS */
	if (unlikely(atomic_read(&q->is_in_shutdown))) {
		qdio_unmark_q(q);
		goto out;
	}

	/* 
	 * we reset spare_ind_was_set, when the queue does not use the
	 * spare indicator
	 */
	if (spare_ind_was_set)
		spare_ind_was_set = (q->dev_st_chg_ind == &spare_indicator);

	if (!(*(q->dev_st_chg_ind)) && !spare_ind_was_set)
		goto out;
	/*
	 * q->dev_st_chg_ind is the indicator, be it shared or not.
	 * only clear it, if indicator is non-shared
	 */
	if (!spare_ind_was_set)
		tiqdio_clear_summary_bit((__u32*)q->dev_st_chg_ind);

	if (q->hydra_gives_outbound_pcis) {
		if (!q->siga_sync_done_on_thinints) {
			SYNC_MEMORY_ALL;
		} else if ((!q->siga_sync_done_on_outb_tis)&&
			 (q->hydra_gives_outbound_pcis)) {
			SYNC_MEMORY_ALL_OUTB;
		}
	} else {
		SYNC_MEMORY;
	}
	/*
	 * maybe we have to do work on our outbound queues... at least
	 * we have to check the outbound-int-capable thinint-capable
	 * queues
	 */
	if (q->hydra_gives_outbound_pcis) {
		irq_ptr = (struct qdio_irq*)q->irq_ptr;
		for (i=0;i<irq_ptr->no_output_qs;i++) {
			oq = irq_ptr->output_qs[i];
#ifdef QDIO_PERFORMANCE_STATS
			perf_stats.tl_runs--;
#endif /* QDIO_PERFORMANCE_STATS */
			if (!qdio_is_outbound_q_done(oq))
				__qdio_outbound_processing(oq);
		}
	}

	if (!qdio_has_inbound_q_moved(q))
		goto out;

	qdio_kick_inbound_handler(q);
	if (tiqdio_is_inbound_q_done(q))
		if (!qdio_stop_polling(q)) {
			/* 
			 * we set the flags to get into the stuff next time,
			 * see also comment in qdio_stop_polling 
			 */
			tiqdio_set_summary_bit((__u32*)q->dev_st_chg_ind);
			tiqdio_sched_tl();
		}
out:
	qdio_release_q(q);
}

static void
tiqdio_inbound_processing(struct qdio_q *q)
{
	__tiqdio_inbound_processing(q, atomic_read(&spare_indicator_usecount));
}

static inline void
__qdio_inbound_processing(struct qdio_q *q)
{
	int q_laps=0;

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

	if (unlikely(qdio_reserve_q(q))) {
		qdio_release_q(q);
#ifdef QDIO_PERFORMANCE_STATS
		i_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
	i_p_nc++;
	perf_stats.tl_runs++;
#endif /* QDIO_PERFORMANCE_STATS */

again:
	if (qdio_has_inbound_q_moved(q)) {
		qdio_kick_inbound_handler(q);
		if (!qdio_stop_polling(q)) {
			q_laps++;
			if (q_laps<QDIO_Q_LAPS) 
				goto again;
		}
		qdio_mark_q(q);
	} else {
		if (!qdio_is_inbound_q_done(q)) 
                        /* means poll time is not yet over */
			qdio_mark_q(q);
	}

	qdio_release_q(q);
}

static void
qdio_inbound_processing(struct qdio_q *q)
{
	__qdio_inbound_processing(q);
}

/************************* MAIN ROUTINES *******************************/

#ifdef QDIO_USE_PROCESSING_STATE
static inline int
tiqdio_reset_processing_state(struct qdio_q *q, int q_laps)
{
	if (!q) {
		tiqdio_sched_tl();
		return 0;
	}

	/* 
	 * under VM, we have not used the PROCESSING state, so no
	 * need to stop polling 
	 */
	if (q->siga_sync)
		return 2;

	if (unlikely(qdio_reserve_q(q))) {
		qdio_release_q(q);
#ifdef QDIO_PERFORMANCE_STATS
		ii_p_c++;
#endif /* QDIO_PERFORMANCE_STATS */
		/* 
		 * as we might just be about to stop polling, we make
		 * sure that we check again at least once more 
		 */
		
		/* 
		 * sanity -- we'd get here without setting the
		 * dev st chg ind 
		 */
		tiqdio_set_summary_bit((__u32*)q->dev_st_chg_ind);
		tiqdio_sched_tl();
		return 0;
	}
	if (qdio_stop_polling(q)) {
		qdio_release_q(q);
		return 2;
	}		
	if (q_laps<QDIO_Q_LAPS-1) {
		qdio_release_q(q);
		return 3;
	}
	/* 
	 * we set the flags to get into the stuff