/* * linux/drivers/s390/cio/qdio_main.c * * Linux for s390 qdio support, buffer handling, qdio API and module support. * * Copyright 2000,2008 IBM Corp. * Author(s): Utz Bacher * Jan Glauber * 2.6 cio integration by Cornelia Huck */ #include #include #include #include #include #include #include #include #include #include "cio.h" #include "css.h" #include "device.h" #include "qdio.h" #include "qdio_debug.h" MODULE_AUTHOR("Utz Bacher ,"\ "Jan Glauber "); MODULE_DESCRIPTION("QDIO base support"); MODULE_LICENSE("GPL"); static inline int do_siga_sync(struct subchannel_id schid, unsigned int out_mask, unsigned int in_mask) { register unsigned long __fc asm ("0") = 2; register struct subchannel_id __schid asm ("1") = schid; register unsigned long out asm ("2") = out_mask; register unsigned long in asm ("3") = in_mask; int cc; asm volatile( " siga 0\n" " ipm %0\n" " srl %0,28\n" : "=d" (cc) : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); return cc; } static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) { register unsigned long __fc asm ("0") = 1; register struct subchannel_id __schid asm ("1") = schid; register unsigned long __mask asm ("2") = mask; int cc; asm volatile( " siga 0\n" " ipm %0\n" " srl %0,28\n" : "=d" (cc) : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); return cc; } /** * do_siga_output - perform SIGA-w/wt function * @schid: subchannel id or in case of QEBSM the subchannel token * @mask: which output queues to process * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer * @fc: function code to perform * * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. * Note: For IQDC unicast queues only the highest priority queue is processed. */ static inline int do_siga_output(unsigned long schid, unsigned long mask, unsigned int *bb, unsigned int fc) { register unsigned long __fc asm("0") = fc; register unsigned long __schid asm("1") = schid; register unsigned long __mask asm("2") = mask; int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; asm volatile( " siga 0\n" "0: ipm %0\n" " srl %0,28\n" "1:\n" EX_TABLE(0b, 1b) : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) : : "cc", "memory"); *bb = ((unsigned int) __fc) >> 31; return cc; } static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) { /* all done or next buffer state different */ if (ccq == 0 || ccq == 32) return 0; /* not all buffers processed */ if (ccq == 96 || ccq == 97) return 1; /* notify devices immediately */ DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); return -EIO; } /** * qdio_do_eqbs - extract buffer states for QEBSM * @q: queue to manipulate * @state: state of the extracted buffers * @start: buffer number to start at * @count: count of buffers to examine * @auto_ack: automatically acknowledge buffers * * Returns the number of successfully extracted equal buffer states. * Stops processing if a state is different from the last buffers state. */ static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, int start, int count, int auto_ack) { unsigned int ccq = 0; int tmp_count = count, tmp_start = start; int nr = q->nr; int rc; BUG_ON(!q->irq_ptr->sch_token); qperf_inc(q, eqbs); if (!q->is_input_q) nr += q->irq_ptr->nr_input_qs; again: ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, auto_ack); rc = qdio_check_ccq(q, ccq); /* At least one buffer was processed, return and extract the remaining * buffers later. */ if ((ccq == 96) && (count != tmp_count)) { qperf_inc(q, eqbs_partial); return (count - tmp_count); } if (rc == 1) { DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); goto again; } if (rc < 0) { DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, 0, -1, -1, q->irq_ptr->int_parm); return 0; } return count - tmp_count; } /** * qdio_do_sqbs - set buffer states for QEBSM * @q: queue to manipulate * @state: new state of the buffers * @start: first buffer number to change * @count: how many buffers to change * * Returns the number of successfully changed buffers. * Does retrying until the specified count of buffer states is set or an * error occurs. */ static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, int count) { unsigned int ccq = 0; int tmp_count = count, tmp_start = start; int nr = q->nr; int rc; if (!count) return 0; BUG_ON(!q->irq_ptr->sch_token); qperf_inc(q, sqbs); if (!q->is_input_q) nr += q->irq_ptr->nr_input_qs; again: ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); rc = qdio_check_ccq(q, ccq); if (rc == 1) { DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); qperf_inc(q, sqbs_partial); goto again; } if (rc < 0) { DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, 0, -1, -1, q->irq_ptr->int_parm); return 0; } WARN_ON(tmp_count); return count - tmp_count; } /* returns number of examined buffers and their common state in *state */ static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, unsigned char *state, unsigned int count, int auto_ack) { unsigned char __state = 0; int i; BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); if (is_qebsm(q)) return qdio_do_eqbs(q, state, bufnr, count, auto_ack); for (i = 0; i < count; i++) { if (!__state) __state = q->slsb.val[bufnr]; else if (q->slsb.val[bufnr] != __state) break; bufnr = next_buf(bufnr); } *state = __state; return i; } static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, unsigned char *state, int auto_ack) { return get_buf_states(q, bufnr, state, 1, auto_ack); } /* wrap-around safe setting of slsb states, returns number of changed buffers */ static inline int set_buf_states(struct qdio_q *q, int bufnr, unsigned char state, int count) { int i; BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); if (is_qebsm(q)) return qdio_do_sqbs(q, state, bufnr, count); for (i = 0; i < count; i++) { xchg(&q->slsb.val[bufnr], state); bufnr = next_buf(bufnr); } return count; } static inline int set_buf_state(struct qdio_q *q, int bufnr, unsigned char state) { return set_buf_states(q, bufnr, state, 1); } /* set slsb states to initial state */ void qdio_init_buf_states(struct qdio_irq *irq_ptr) { struct qdio_q *q; int i; for_each_input_queue(irq_ptr, q, i) set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, QDIO_MAX_BUFFERS_PER_Q); for_each_output_queue(irq_ptr, q, i) set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, QDIO_MAX_BUFFERS_PER_Q); } static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, unsigned int input) { int cc; if (!need_siga_sync(q)) return 0; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); qperf_inc(q, siga_sync); cc = do_siga_sync(q->irq_ptr->schid, output, input); if (cc) DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); return cc; } static inline int qdio_siga_sync_q(struct qdio_q *q) { if (q->is_input_q) return qdio_siga_sync(q, 0, q->mask); else return qdio_siga_sync(q, q->mask, 0); } static inline int qdio_siga_sync_out(struct qdio_q *q) { return qdio_siga_sync(q, ~0U, 0); } static inline int qdio_siga_sync_all(struct qdio_q *q) { return qdio_siga_sync(q, ~0U, ~0U); } static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) { unsigned long schid; unsigned int fc = 0; u64 start_time = 0; int cc; if (q->u.out.use_enh_siga) fc = 3; if (is_qebsm(q)) { schid = q->irq_ptr->sch_token; fc |= 0x80; } else schid = *((u32 *)&q->irq_ptr->schid); again: cc = do_siga_output(schid, q->mask, busy_bit, fc); /* hipersocket busy condition */ if (*busy_bit) { WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); if (!start_time) { start_time = get_clock(); goto again; } if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) goto again; } return cc; } static inline int qdio_siga_input(struct qdio_q *q) { int cc; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); qperf_inc(q, siga_read); cc = do_siga_input(q->irq_ptr->schid, q->mask); if (cc) DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); return cc; } static inline void qdio_sync_after_thinint(struct qdio_q *q) { if (pci_out_supported(q)) { if (need_siga_sync_thinint(q)) qdio_siga_sync_all(q); else if (need_siga_sync_out_thinint(q)) qdio_siga_sync_out(q); } else qdio_siga_sync_q(q); } int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, unsigned char *state) { qdio_siga_sync_q(q); return get_buf_states(q, bufnr, state, 1, 0); } static inline void qdio_stop_polling(struct qdio_q *q) { if (!q->u.in.polling) return; q->u.in.polling = 0; qperf_inc(q, stop_polling); /* show the card that we are not polling anymore */ if (is_qebsm(q)) { set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, q->u.in.ack_count); q->u.in.ack_count = 0; } else set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); } static inline void account_sbals(struct qdio_q *q, int count) { int pos = 0; q->q_stats.nr_sbal_total += count; if (count == QDIO_MAX_BUFFERS_MASK) { q->q_stats.nr_sbals[7]++; return; } while (count >>= 1) pos++; q->q_stats.nr_sbals[pos]++; } static void announce_buffer_error(struct qdio_q *q, int count) { q->qdio_error |= QDIO_ERROR_SLSB_STATE; /* special handling for no target buffer empty */ if ((!q->is_input_q && (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { qperf_inc(q, target_full); DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", q->first_to_check); return; } DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); DBF_ERROR("F14:%2x F15:%2x", q->sbal[q->first_to_check]->element[14].flags & 0xff, q->sbal[q->first_to_check]->element[15].flags & 0xff); } static inline void inbound_primed(struct qdio_q *q, int count) { int new; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); /* for QEBSM the ACK was already set by EQBS */ if (is_qebsm(q)) { if (!q->u.in.polling) { q->u.in.polling = 1; q->u.in.ack_count = count; q->u.in.ack_start = q->first_to_check; return; } /* delete the previous ACK's */ set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, q->u.in.ack_count); q->u.in.ack_count = count; q->u.in.ack_start = q->first_to_check; return; } /* * ACK the newest buffer. The ACK will be removed in qdio_stop_polling * or by the next inbound run. */ new = add_buf(q->first_to_check, count - 1); if (q->u.in.polling) { /* reset the previous ACK but first set the new one */ set_buf_state(q, new, SLSB_P_INPUT_ACK); set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); } else { q->u.in.polling = 1; set_buf_state(q, new, SLSB_P_INPUT_ACK); } q->u.in.ack_start = new; count--; if (!count) return; /* need to change ALL buffers to get more interrupts */ set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); } static int get_inbound_buffer_frontier(struct qdio_q *q) { int count, stop; unsigned char state; /* * Don't check 128 buffers, as otherwise qdio_inbound_q_moved * would return 0. */ count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); stop = add_buf(q->first_to_check, count); if (q->first_to_check == stop) goto out; /* * No siga sync here, as a PCI or we after a thin interrupt * already sync'ed the queues. */ count = get_buf_states(q, q->first_to_check, &state, count, 1); if (!count) goto out; switch (state) { case SLSB_P_INPUT_PRIMED: inbound_primed(q, count); q->first_to_check = add_buf(q->first_to_check, count); if (atomic_sub(count, &q->nr_buf_used) == 0) qperf_inc(q, inbound_queue_full); if (q->irq_ptr->perf_stat_enabled) account_sbals(q, count); break; case SLSB_P_INPUT_ERROR: announce_buffer_error(q, count); /* process the buffer, the upper layer will take care of it */ q->first_to_check = add_buf(q->first_to_check, count); atomic_sub(count, &q->nr_buf_used); if (q->irq_ptr->perf_stat_enabled) account_sbals_error(q, count); break; case SLSB_CU_INPUT_EMPTY: case SLSB_P_INPUT_NOT_INIT: case SLSB_P_INPUT_ACK: if (q->irq_ptr->perf_stat_enabled) q->q_stats.nr_sbal_nop++; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); break; default: BUG(); } out: return q->first_to_check; } static int qdio_inbound_q_moved(struct qdio_q *q) { int bufnr; bufnr = get_inbound_buffer_frontier(q); if ((bufnr != q->last_move) || q->qdio_error) { q->last_move = bufnr; if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) q->u.in.timestamp = get_clock(); return 1; } else return 0; } static inline int qdio_inbound_q_done(struct qdio_q *q) { unsigned char state = 0; if (!atomic_read(&q->nr_buf_used)) return 1; qdio_siga_sync_q(q); get_buf_state(q, q->first_to_check, &state, 0); if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) /* more work coming */ return 0; if (is_thinint_irq(q->irq_ptr)) return 1; /* don't poll under z/VM */ if (MACHINE_IS_VM) return 1; /* * At this point we know, that inbound first_to_check * has (probably) not moved (see qdio_inbound_processing). */ if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", q->first_to_check); return 1; } else return 0; } static void qdio_kick_handler(struct qdio_q *q) { int start = q->first_to_kick; int end = q->first_to_check; int count; if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) return; count = sub_buf(end, start); if (q->is_input_q) { qperf_inc(q, inbound_handler); DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); } else { qperf_inc(q, outbound_handler); DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", start, count); } q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, q->irq_ptr->int_parm); /* for the next time */ q->first_to_kick = end; q->qdio_error = 0; } static void __qdio_inbound_processing(struct qdio_q *q) { qperf_inc(q, tasklet_inbound); if (!qdio_inbound_q_moved(q)) return; qdio_kick_handler(q); if (!qdio_inbound_q_done(q)) { /* means poll time is not yet over */ qperf_inc(q, tasklet_inbound_resched); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { tasklet_schedule(&q->tasklet); return; } } qdio_stop_polling(q); /* * We need to check again to not lose initiative after * resetting the ACK state. */ if (!qdio_inbound_q_done(q)) { qperf_inc(q, tasklet_inbound_resched2); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) tasklet_schedule(&q->tasklet); } } void qdio_inbound_processing(unsigned long data) { struct qdio_q *q = (struct qdio_q *)data; __qdio_inbound_processing(q); } static int get_outbound_buffer_frontier(struct qdio_q *q) { int count, stop; unsigned char state; if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) qdio_siga_sync_q(q); /* * Don't check 128 buffers, as otherwise qdio_inbound_q_moved * would return 0. */ count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); stop = add_buf(q->first_to_check, count); if (q->first_to_check == stop) return q->first_to_check; count = get_buf_states(q, q->first_to_check, &state, count, 0); if (!count) return q->first_to_check; switch (state) { case SLSB_P_OUTPUT_EMPTY: /* the adapter got it */ DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); atomic_sub(count, &q->nr_buf_used); q->first_to_check = add_buf(q->first_to_check, count); if (q->irq_ptr->perf_stat_enabled) account_sbals(q, count); break; case SLSB_P_OUTPUT_ERROR: announce_buffer_error(q, count); /* process the buffer, the upper layer will take care of it */ q->first_to_check = add_buf(q->first_to_check, count); atomic_sub(count, &q->nr_buf_used); if (q->irq_ptr->perf_stat_enabled) account_sbals_error(q, count); break; case SLSB_CU_OUTPUT_PRIMED: /* the adapter has not fetched the output yet */ if (q->irq_ptr->perf_stat_enabled) q->q_stats.nr_sbal_nop++; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); break; case SLSB_P_OUTPUT_NOT_INIT: case SLSB_P_OUTPUT_HALTED: break; default: BUG(); } return q->first_to_check; } /* all buffers processed? */ static inline int qdio_outbound_q_done(struct qdio_q *q) { return atomic_read(&q->nr_buf_used) == 0; } static inline int qdio_outbound_q_moved(struct qdio_q *q) { int bufnr; bufnr = get_outbound_buffer_frontier(q); if ((bufnr != q->last_move) || q->qdio_error) { q->last_move = bufnr; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); return 1; } else return 0; } static int qdio_kick_outbound_q(struct qdio_q *q) { unsigned int busy_bit; int cc; if (!need_siga_out(q)) return 0; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); qperf_inc(q, siga_write); cc = qdio_siga_output(q, &busy_bit); switch (cc) { case 0: break; case 2: if (busy_bit) { DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); cc |= QDIO_ERROR_SIGA_BUSY; } else DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); break; case 1: case 3: DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); break; } return cc; } static void __qdio_outbound_processing(struct qdio_q *q) { qperf_inc(q, tasklet_outbound); BUG_ON(atomic_read(&q->nr_buf_used) < 0); if (qdio_outbound_q_moved(q)) qdio_kick_handler(q); if (queue_type(q) == QDIO_ZFCP_QFMT) if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) goto sched; /* bail out for HiperSockets unicast queues */ if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) return; if ((queue_type(q) == QDIO_IQDIO_QFMT) && (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) goto sched; if (q->u.out.pci_out_enabled) return; /* * Now we know that queue type is either qeth without pci enabled * or HiperSockets multicast. Make sure buffer switch from PRIMED to * EMPTY is noticed and outbound_handler is called after some time. */ if (qdio_outbound_q_done(q)) del_timer(&q->u.out.timer); else if (!timer_pending(&q->u.out.timer)) mod_timer(&q->u.out.timer, jiffies + 10 * HZ); return; sched: if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) return; tasklet_schedule(&q->tasklet); } /* outbound tasklet */ void qdio_outbound_processing(unsigned long data) { struct qdio_q *q = (struct qdio_q *)data; __qdio_outbound_processing(q); } void qdio_outbound_timer(unsigned long data) { struct qdio_q *q = (struct qdio_q *)data; if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) return; tasklet_schedule(&q->tasklet); } static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) { struct qdio_q *out; int i; if (!pci_out_supported(q)) return; for_each_output_queue(q->irq_ptr, out, i) if (!qdio_outbound_q_done(out)) tasklet_schedule(&out->tasklet); } static void __tiqdio_inbound_processing(struct qdio_q *q) { qperf_inc(q, tasklet_inbound); qdio_sync_after_thinint(q); /* * The interrupt could be caused by a PCI request. Check the * PCI capable outbound queues. */ qdio_check_outbound_after_thinint(q); if (!qdio_inbound_q_moved(q)) return; qdio_kick_handler(q); if (!qdio_inbound_q_done(q)) { qperf_inc(q, tasklet_inbound_resched); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { tasklet_schedule(&q->tasklet); return; } } qdio_stop_polling(q); /* * We need to check again to not lose initiative after * resetting the ACK state. */ if (!qdio_inbound_q_done(q)) { qperf_inc(q, tasklet_inbound_resched2); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) tasklet_schedule(&q->tasklet); } } void tiqdio_inbound_processing(unsigned long data) { struct qdio_q *q = (struct qdio_q *)data; __tiqdio_inbound_processing(q); } static inline void qdio_set_state(struct qdio_irq *irq_ptr, enum qdio_irq_states state) { DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); irq_ptr->state = state; mb(); } static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) { if (irb->esw.esw0.erw.cons) { DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); DBF_ERROR_HEX(irb, 64); DBF_ERROR_HEX(irb->ecw, 64); } } /* PCI interrupt handler */ static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) { int i; struct qdio_q *q; if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) return; for_each_input_queue(irq_ptr, q, i) tasklet_schedule(&q->tasklet); if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) return; for_each_output_queue(irq_ptr, q, i) { if (qdio_outbound_q_done(q)) continue; if (!siga_syncs_out_pci(q)) qdio_siga_sync_q(q); tasklet_schedule(&q->tasklet); } } static void qdio_handle_activate_check(struct ccw_device *cdev, unsigned long intparm, int cstat, int dstat) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; struct qdio_q *q; DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); DBF_ERROR("intp :%lx", intparm); DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); if (irq_ptr->nr_input_qs) { q = irq_ptr->input_qs[0]; } else if (irq_ptr->nr_output_qs) { q = irq_ptr->output_qs[0]; } else { dump_stack(); goto no_handler; } q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, 0, -1, -1, irq_ptr->int_parm); no_handler: qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); } static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, int dstat) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); if (cstat) goto error; if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) goto error; if (!(dstat & DEV_STAT_DEV_END)) goto error; qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); return; error: DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); } /* qdio interrupt handler */ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; int cstat, dstat; if (!intparm || !irq_ptr) { DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); return; } if (irq_ptr->perf_stat_enabled) irq_ptr->perf_stat.qdio_int++; if (IS_ERR(irb)) { switch (PTR_ERR(irb)) { case -EIO: DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); wake_up(&cdev->private->wait_q); return; default: WARN_ON(1); return; } } qdio_irq_check_sense(irq_ptr, irb); cstat = irb->scsw.cmd.cstat; dstat = irb->scsw.cmd.dstat; switch (irq_ptr->state) { case QDIO_IRQ_STATE_INACTIVE: qdio_establish_handle_irq(cdev, cstat, dstat); break; case QDIO_IRQ_STATE_CLEANUP: qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); break; case QDIO_IRQ_STATE_ESTABLISHED: case QDIO_IRQ_STATE_ACTIVE: if (cstat & SCHN_STAT_PCI) { qdio_int_handler_pci(irq_ptr); return; } if (cstat || dstat) qdio_handle_activate_check(cdev, intparm, cstat, dstat); break; case QDIO_IRQ_STATE_STOPPED: break; default: WARN_ON(1); } wake_up(&cdev->private->wait_q); } /** * qdio_get_ssqd_desc - get qdio subchannel description * @cdev: ccw device to get description for * @data: where to store the ssqd * * Returns 0 or an error code. The results of the chsc are stored in the * specified structure. */ int qdio_get_ssqd_desc(struct ccw_device *cdev, struct qdio_ssqd_desc *data) { if (!cdev || !cdev->private) return -EINVAL; DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); } EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); /** * qdio_cleanup - shutdown queues and free data structures * @cdev: associated ccw device * @how: use halt or clear to shutdown * * This function calls qdio_shutdown() for @cdev with method @how. * and qdio_free(). The qdio_free() return value is ignored since * !irq_ptr is already checked. */ int qdio_cleanup(struct ccw_device *cdev, int how) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; int rc; if (!irq_ptr) return -ENODEV; rc = qdio_shutdown(cdev, how); qdio_free(cdev); return rc; } EXPORT_SYMBOL_GPL(qdio_cleanup); static void qdio_shutdown_queues(struct ccw_device *cdev) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; struct qdio_q *q; int i; for_each_input_queue(irq_ptr, q, i) tasklet_kill(&q->tasklet); for_each_output_queue(irq_ptr, q, i) { del_timer(&q->u.out.timer); tasklet_kill(&q->tasklet); } } /** * qdio_shutdown - shut down a qdio subchannel * @cdev: associated ccw device * @how: use halt or clear to shutdown */ int qdio_shutdown(struct ccw_device *cdev, int how) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; int rc; unsigned long flags; if (!irq_ptr) return -ENODEV; BUG_ON(irqs_disabled()); DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); mutex_lock(&irq_ptr->setup_mutex); /* * Subchannel was already shot down. We cannot prevent being called * twice since cio may trigger a shutdown asynchronously. */ if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { mutex_unlock(&irq_ptr->setup_mutex); return 0; } /* * Indicate that the device is going down. Scheduling the queue * tasklets is forbidden from here on. */ qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); tiqdio_remove_input_queues(irq_ptr); qdio_shutdown_queues(cdev); qdio_shutdown_debug_entries(irq_ptr, cdev); /* cleanup subchannel */ spin_lock_irqsave(get_ccwdev_lock(cdev), flags); if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); else /* default behaviour is halt */ rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); if (rc) { DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); DBF_ERROR("rc:%4d", rc); goto no_cleanup; } qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); wait_event_interruptible_timeout(cdev->private->wait_q, irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || irq_ptr->state == QDIO_IRQ_STATE_ERR, 10 * HZ); spin_lock_irqsave(get_ccwdev_lock(cdev), flags); no_cleanup: qdio_shutdown_thinint(irq_ptr); /* restore interrupt handler */ if ((void *)cdev->handler == (void *)qdio_int_handler) cdev->handler = irq_ptr->orig_handler; spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); mutex_unlock(&irq_ptr->setup_mutex); if (rc) return rc; return 0; } EXPORT_SYMBOL_GPL(qdio_shutdown); /** * qdio_free - free data structures for a qdio subchannel * @cdev: associated ccw device */ int qdio_free(struct ccw_device *cdev) { struct qdio_irq *irq_ptr = cdev->private->qdio_data; if (!irq_ptr) return -ENODEV; DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); mutex_lock(&irq_ptr->setup_mutex); if (irq_ptr->debug_area != NULL) { debug_unregister(irq_ptr->debug_area); irq_ptr->debug_area = NULL; } cdev->private->qdio_data = NULL; mutex_unlock(&irq_ptr->setup_mutex); qdio_release_memory(irq_ptr); return 0; } EXPORT_SYMBOL_GPL(qdio_free); /** * qdio_initialize - allocate and establish queues for a qdio subchannel * @init_data: initialization data * * This function first allocates queues via qdio_allocate() and on success * establishes them via qdio_establish(). */ int qdio_initialize(struct qdio_initialize *init_data) { int rc; rc = qdio_allocate(init_data); if (rc) return rc; rc = qdio_establish(init_data); if (rc) qdio_free(init_data->cdev); return rc; } EXPORT_SYMBOL_GPL(qdio_initialize); /** * qdio_allocate - allocate qdio queues and associated data * @init_data: initialization data */ int qdio_allocate(struct qdio_initialize *init_data) { struct qdio_irq *irq_ptr; DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); if ((init_data->no_input_qs && !init_data->input_handler) || (init_data->no_output_qs && !init_data->output_handler)) return -EINVAL; if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) return -EINVAL; if ((!init_data->input_sbal_addr_array) || (!init_data->output_sbal_addr_array)) return -EINVAL; /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); if (!irq_ptr) goto out_err; mutex_init(&irq_ptr->setup_mutex); qdio_allocate_dbf(init_data, irq_ptr); /* * Allocate a page for the chsc calls in qdio_establish. * Must be pre-allocated since a zfcp recovery will call * qdio_establish. In case of low memory and swap on a zfcp disk * we may not be able to allocate memory otherwise. */ irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); if (!irq_ptr->chsc_page) goto out_rel; /* qdr is used in ccw1.cda which is u32 */ irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); if (!irq_ptr->qdr) goto out_rel; WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, init_data->no_output_qs)) goto out_rel; init_data->cdev->private->qdio_data = irq_ptr; qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); return 0; out_rel: qdio_release_memory(irq_ptr); out_err: return -ENOMEM; } EXPORT_SYMBOL_GPL(qdio_allocate); /** * qdio_establish - establish queues on a qdio subchannel * @init_data: initialization data */ int qdio_establish(struct qdio_initialize *init_data) { struct qdio_irq *irq_ptr; struct ccw_device *cdev = init_data->cdev; unsigned long saveflags; int rc; DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); irq_ptr = cdev->private->qdio_data; if (!irq_ptr) return -ENODEV; if (cdev->private->state != DEV_STATE_ONLINE) return -EINVAL; mutex_lock(&irq_ptr->setup_mutex); qdio_setup_irq(init_data); rc = qdio_establish_thinint(irq_ptr); if (rc) { mutex_unlock(&irq_ptr->setup_mutex); qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); return rc; } /* establish q */ irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; irq_ptr->ccw.flags = CCW_FLAG_SLI; irq_ptr->ccw.count = irq_ptr->equeue.count; irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); ccw_device_set_options_mask(cdev, 0); rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); if (rc) { DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); DBF_ERROR("rc:%4x", rc); } spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); if (rc) { mutex_unlock(&irq_ptr->setup_mutex); qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); return rc; } wait_event_interruptible_timeout(cdev->private->wait_q, irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { mutex_unlock(&irq_ptr->setup_mutex); qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); return -EIO; } qdio_setup_ssqd_info(irq_ptr); DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); /* qebsm is now setup if available, initialize buffer states */ qdio_init_buf_states(irq_ptr); mutex_unlock(&irq_ptr->setup_mutex); qdio_print_subchannel_info(irq_ptr, cdev); qdio_setup_debug_entries(irq_ptr, cdev); return 0; } EXPORT_SYMBOL_GPL(qdio_establish); /** * qdio_activate - activate queues on a qdio subchannel * @cdev: associated cdev */ int qdio_activate(struct ccw_device *cdev) { struct qdio_irq *irq_ptr; int rc; unsigned long saveflags; DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); irq_ptr = cdev->private->qdio_data; if (!irq_ptr) return -ENODEV; if (cdev->private->state != DEV_STATE_ONLINE) return -EINVAL; mutex_lock(&irq_ptr->setup_mutex); if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { rc = -EBUSY; goto out; } irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; irq_ptr->ccw.flags = CCW_FLAG_SLI; irq_ptr->ccw.count = irq_ptr->aqueue.count; irq_ptr->ccw.cda = 0; spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, 0, DOIO_DENY_PREFETCH); if (rc) { DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); DBF_ERROR("rc:%4x", rc); } spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); if (rc) goto out; if (is_thinint_irq(irq_ptr)) tiqdio_add_input_queues(irq_ptr); /* wait for subchannel to become active */ msleep(5); switch (irq_ptr->state) { case QDIO_IRQ_STATE_STOPPED: case QDIO_IRQ_STATE_ERR: rc = -EIO; break; default: qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); rc = 0; } out: mutex_unlock(&irq_ptr->setup_mutex); return rc; } EXPORT_SYMBOL_GPL(qdio_activate); static inline int buf_in_between(int bufnr, int start, int count) { int end = add_buf(start, count); if (end > start) { if (bufnr >= start && bufnr < end) return 1; else return 0; } /* wrap-around case */ if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || (bufnr < end)) return 1; else return 0; } /** * handle_inbound - reset processed input buffers * @q: queue containing the buffers * @callflags: flags * @bufnr: first buffer to process * @count: how many buffers are emptied */ static int handle_inbound(struct qdio_q *q, unsigned int callflags, int bufnr, int count) { int used, diff; qperf_inc(q, inbound_call); if (!q->u.in.polling) goto set; /* protect against stop polling setting an ACK for an emptied slsb */ if (count == QDIO_MAX_BUFFERS_PER_Q) { /* overwriting everything, just delete polling status */ q->u.in.polling = 0; q->u.in.ack_count = 0; goto set; } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { if (is_qebsm(q)) { /* partial overwrite, just update ack_start */ diff = add_buf(bufnr, count); diff = sub_buf(diff, q->u.in.ack_start); q->u.in.ack_count -= diff; if (q->u.in.ack_count <= 0) { q->u.in.polling = 0; q->u.in.ack_count = 0; goto set; } q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); } else /* the only ACK will be deleted, so stop polling */ q->u.in.polling = 0; } set: count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); used = atomic_add_return(count, &q->nr_buf_used) - count; BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); /* no need to signal as long as the adapter had free buffers */ if (used) return 0; if (need_siga_in(q)) return qdio_siga_input(q); return 0; } /** * handle_outbound - process filled outbound buffers * @q: queue containing the buffers * @callflags: flags * @bufnr: first buffer to process * @count: how many buffers are filled */ static int handle_outbound(struct qdio_q *q, unsigned int callflags, int bufnr, int count) { unsigned char state; int used, rc = 0; qperf_inc(q, outbound_call); count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); used = atomic_add_return(count, &q->nr_buf_used); BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); if (callflags & QDIO_FLAG_PCI_OUT) { q->u.out.pci_out_enabled = 1; qperf_inc(q, pci_request_int); } else q->u.out.pci_out_enabled = 0; if (queue_type(q) == QDIO_IQDIO_QFMT) { if (multicast_outbound(q)) rc = qdio_kick_outbound_q(q); else if ((q->irq_ptr->ssqd_desc.mmwc > 1) && (count > 1) && (count <= q->irq_ptr->ssqd_desc.mmwc)) { /* exploit enhanced SIGA */ q->u.out.use_enh_siga = 1; rc = qdio_kick_outbound_q(q); } else { /* * One siga-w per buffer required for unicast * HiperSockets. */ q->u.out.use_enh_siga = 0; while (count--) { rc = qdio_kick_outbound_q(q); if (rc) goto out; } } goto out; } if (need_siga_sync(q)) { qdio_siga_sync_q(q); goto out; } /* try to fast requeue buffers */ get_buf_state(q, prev_buf(bufnr), &state, 0); if (state != SLSB_CU_OUTPUT_PRIMED) rc = qdio_kick_outbound_q(q); else qperf_inc(q, fast_requeue); out: tasklet_schedule(&q->tasklet); return rc; } /** * do_QDIO - process input or output buffers * @cdev: associated ccw_device for the qdio subchannel * @callflags: input or output and special flags from the program * @q_nr: queue number * @bufnr: buffer number * @count: how many buffers to process */ int do_QDIO(struct ccw_device *cdev, unsigned int callflags, int q_nr, unsigned int bufnr, unsigned int count) { struct qdio_irq *irq_ptr; if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) return -EINVAL; irq_ptr = cdev->private->qdio_data; if (!irq_ptr) return -ENODEV; DBF_DEV_EVENT(DBF_INFO, irq_ptr, "do%02x b:%02x c:%02x", callflags, bufnr, count); if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) return -EBUSY; if (callflags & QDIO_FLAG_SYNC_INPUT) return handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr, count); else if (callflags & QDIO_FLAG_SYNC_OUTPUT) return handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr, count); return -EINVAL; } EXPORT_SYMBOL_GPL(do_QDIO); static int __init init_QDIO(void) { int rc; rc = qdio_setup_init(); if (rc) return rc; rc = tiqdio_allocate_memory(); if (rc) goto out_cache; rc = qdio_debug_init(); if (rc) goto out_ti; rc = tiqdio_register_thinints(); if (rc) goto out_debug; return 0; out_debug: qdio_debug_exit(); out_ti: tiqdio_free_memory(); out_cache: qdio_setup_exit(); return rc; } static void __exit exit_QDIO(void) { tiqdio_unregister_thinints(); tiqdio_free_memory(); qdio_debug_exit(); qdio_setup_exit(); } module_init(init_QDIO); module_exit(exit_QDIO);