diff options
Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 1873 |
1 files changed, 1873 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c new file mode 100644 index 000000000..4b7cc8d42 --- /dev/null +++ b/drivers/s390/cio/qdio_main.c @@ -0,0 +1,1873 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Linux for s390 qdio support, buffer handling, qdio API and module support. + * + * Copyright IBM Corp. 2000, 2008 + * Author(s): Utz Bacher <utz.bacher@de.ibm.com> + * Jan Glauber <jang@linux.vnet.ibm.com> + * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/gfp.h> +#include <linux/io.h> +#include <linux/atomic.h> +#include <asm/debug.h> +#include <asm/qdio.h> +#include <asm/ipl.h> + +#include "cio.h" +#include "css.h" +#include "device.h" +#include "qdio.h" +#include "qdio_debug.h" + +MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ + "Jan Glauber <jang@linux.vnet.ibm.com>"); +MODULE_DESCRIPTION("QDIO base support"); +MODULE_LICENSE("GPL"); + +static inline int do_siga_sync(unsigned long schid, + unsigned int out_mask, unsigned int in_mask, + unsigned int fc) +{ + register unsigned long __fc asm ("0") = fc; + register unsigned long __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(unsigned long schid, unsigned int mask, + 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; + + asm volatile( + " siga 0\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : "d" (__fc), "d" (__schid), "d" (__mask) : "cc"); + 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 + * @aob: asynchronous operation block + * + * Returns condition code. + * 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, + unsigned long aob) +{ + register unsigned long __fc asm("0") = fc; + register unsigned long __schid asm("1") = schid; + register unsigned long __mask asm("2") = mask; + register unsigned long __aob asm("3") = aob; + int cc; + + asm volatile( + " siga 0\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc), "+d" (__fc), "+d" (__aob) + : "d" (__schid), "d" (__mask) + : "cc"); + *bb = __fc >> 31; + return cc; +} + +/** + * 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) +{ + int tmp_count = count, tmp_start = start, nr = q->nr; + unsigned int ccq = 0; + + 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); + + switch (ccq) { + case 0: + case 32: + /* all done, or next buffer state different */ + return count - tmp_count; + case 96: + /* not all buffers processed */ + qperf_inc(q, eqbs_partial); + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", + tmp_count); + return count - tmp_count; + case 97: + /* no buffer processed */ + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); + goto again; + default: + DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); + 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_GET_BUF_STATE, q->nr, + q->first_to_kick, count, q->irq_ptr->int_parm); + return 0; + } +} + +/** + * 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; + + if (!count) + return 0; + 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); + + switch (ccq) { + case 0: + case 32: + /* all done, or active buffer adapter-owned */ + WARN_ON_ONCE(tmp_count); + return count - tmp_count; + case 96: + /* not all buffers processed */ + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); + qperf_inc(q, sqbs_partial); + goto again; + default: + DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); + 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_SET_BUF_STATE, q->nr, + q->first_to_kick, count, q->irq_ptr->int_parm); + return 0; + } +} + +/* + * Returns number of examined buffers and their common state in *state. + * Requested number of buffers-to-examine must be > 0. + */ +static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, + unsigned char *state, unsigned int count, + int auto_ack, int merge_pending) +{ + unsigned char __state = 0; + int i; + + if (is_qebsm(q)) + return qdio_do_eqbs(q, state, bufnr, count, auto_ack); + + /* get initial state: */ + __state = q->slsb.val[bufnr]; + if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) + __state = SLSB_P_OUTPUT_EMPTY; + + for (i = 1; i < count; i++) { + bufnr = next_buf(bufnr); + + /* merge PENDING into EMPTY: */ + if (merge_pending && + q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING && + __state == SLSB_P_OUTPUT_EMPTY) + continue; + + /* stop if next state differs from initial state: */ + if (q->slsb.val[bufnr] != __state) + break; + } + *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, 0); +} + +/* 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; + + 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 */ +static 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) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_SYNC; + int cc; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); + qperf_inc(q, siga_sync); + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_sync(schid, output, input, fc); + if (unlikely(cc)) + DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); + return (cc) ? -EIO : 0; +} + +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 int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit, + unsigned long aob) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_WRITE; + u64 start_time = 0; + int retries = 0, cc; + unsigned long laob = 0; + + WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) || + !q->u.out.use_cq)); + if (q->u.out.use_cq && aob != 0) { + fc = QDIO_SIGA_WRITEQ; + laob = aob; + } + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } +again: + cc = do_siga_output(schid, q->mask, busy_bit, fc, laob); + + /* hipersocket busy condition */ + if (unlikely(*busy_bit)) { + retries++; + + if (!start_time) { + start_time = get_tod_clock_fast(); + goto again; + } + if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) + goto again; + } + if (retries) { + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, + "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); + } + return cc; +} + +static inline int qdio_siga_input(struct qdio_q *q) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_READ; + int cc; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); + qperf_inc(q, siga_read); + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_input(schid, q->mask, fc); + if (unlikely(cc)) + DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); + return (cc) ? -EIO : 0; +} + +#define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) +#define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) + +static inline void qdio_sync_queues(struct qdio_q *q) +{ + /* PCI capable outbound queues will also be scanned so sync them too */ + if (pci_out_supported(q)) + qdio_siga_sync_all(q); + else + qdio_siga_sync_q(q); +} + +int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, + unsigned char *state) +{ + if (need_siga_sync(q)) + qdio_siga_sync_q(q); + return get_buf_states(q, bufnr, state, 1, 0, 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, unsigned int count) +{ + int pos; + + q->q_stats.nr_sbal_total += count; + if (count == QDIO_MAX_BUFFERS_MASK) { + q->q_stats.nr_sbals[7]++; + return; + } + pos = ilog2(count); + q->q_stats.nr_sbals[pos]++; +} + +static void process_buffer_error(struct qdio_q *q, int count) +{ + unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : + SLSB_P_OUTPUT_NOT_INIT; + + q->qdio_error = QDIO_ERROR_SLSB_STATE; + + /* special handling for no target buffer empty */ + if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q && + q->sbal[q->first_to_check]->element[15].sflags == 0x10) { + qperf_inc(q, target_full); + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", + q->first_to_check); + goto set; + } + + 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].sflags, + q->sbal[q->first_to_check]->element[15].sflags); + +set: + /* + * Interrupts may be avoided as long as the error is present + * so change the buffer state immediately to avoid starvation. + */ + set_buf_states(q, q->first_to_check, state, count); +} + +static inline void inbound_primed(struct qdio_q *q, int count) +{ + int new; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, 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) +{ + unsigned char state = 0; + int count; + + q->timestamp = get_tod_clock_fast(); + + /* + * 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); + if (!count) + 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, 0); + 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_return(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: + process_buffer_error(q, count); + q->first_to_check = add_buf(q->first_to_check, count); + if (atomic_sub_return(count, &q->nr_buf_used) == 0) + qperf_inc(q, inbound_queue_full); + 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:%1d %#02x", + q->nr, q->first_to_check); + break; + default: + WARN_ON_ONCE(1); + } +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->last_move = bufnr; + if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) + q->u.in.timestamp = get_tod_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; + + if (need_siga_sync(q)) + 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_tod_clock_fast() > 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 inline int contains_aobs(struct qdio_q *q) +{ + return !q->is_input_q && q->u.out.use_cq; +} + +static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) +{ + unsigned char state = 0; + int j, b = start; + + if (!contains_aobs(q)) + return; + + for (j = 0; j < count; ++j) { + get_buf_state(q, b, &state, 0); + if (state == SLSB_P_OUTPUT_PENDING) { + struct qaob *aob = q->u.out.aobs[b]; + if (aob == NULL) + continue; + + q->u.out.sbal_state[b].flags |= + QDIO_OUTBUF_STATE_FLAG_PENDING; + q->u.out.aobs[b] = NULL; + } else if (state == SLSB_P_OUTPUT_EMPTY) { + q->u.out.sbal_state[b].aob = NULL; + } + b = next_buf(b); + } +} + +static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, + int bufnr) +{ + unsigned long phys_aob = 0; + + if (!q->use_cq) + return 0; + + if (!q->aobs[bufnr]) { + struct qaob *aob = qdio_allocate_aob(); + q->aobs[bufnr] = aob; + } + if (q->aobs[bufnr]) { + q->sbal_state[bufnr].aob = q->aobs[bufnr]; + q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; + phys_aob = virt_to_phys(q->aobs[bufnr]); + WARN_ON_ONCE(phys_aob & 0xFF); + } + + q->sbal_state[bufnr].flags = 0; + return phys_aob; +} + +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); + } + + qdio_handle_aobs(q, 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 inline int qdio_tasklet_schedule(struct qdio_q *q) +{ + if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { + tasklet_schedule(&q->tasklet); + return 0; + } + return -EPERM; +} + +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 (!qdio_tasklet_schedule(q)) + 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); + qdio_tasklet_schedule(q); + } +} + +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) +{ + unsigned char state = 0; + int count; + + q->timestamp = get_tod_clock_fast(); + + if (need_siga_sync(q)) + 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); + if (!count) + goto out; + + count = get_buf_states(q, q->first_to_check, &state, count, 0, + q->u.out.use_cq); + if (!count) + goto out; + + switch (state) { + case SLSB_P_OUTPUT_EMPTY: + case SLSB_P_OUTPUT_PENDING: + /* 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: + process_buffer_error(q, count); + 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: + WARN_ON_ONCE(1); + } + +out: + 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->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 long aob) +{ + int retries = 0, cc; + unsigned int busy_bit; + + if (!need_siga_out(q)) + return 0; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); +retry: + qperf_inc(q, siga_write); + + cc = qdio_siga_output(q, &busy_bit, aob); + switch (cc) { + case 0: + break; + case 2: + if (busy_bit) { + while (++retries < QDIO_BUSY_BIT_RETRIES) { + mdelay(QDIO_BUSY_BIT_RETRY_DELAY); + goto retry; + } + DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); + cc = -EBUSY; + } else { + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); + cc = -ENOBUFS; + } + break; + case 1: + case 3: + DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); + cc = -EIO; + break; + } + if (retries) { + DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); + DBF_ERROR("count:%u", retries); + } + return cc; +} + +static void __qdio_outbound_processing(struct qdio_q *q) +{ + qperf_inc(q, tasklet_outbound); + WARN_ON_ONCE(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; + + if (q->u.out.pci_out_enabled) + return; + + /* + * Now we know that queue type is either qeth without pci enabled + * or HiperSockets. 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_sync(&q->u.out.timer); + else + if (!timer_pending(&q->u.out.timer) && + likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) + mod_timer(&q->u.out.timer, jiffies + 10 * HZ); + return; + +sched: + qdio_tasklet_schedule(q); +} + +/* 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(struct timer_list *t) +{ + struct qdio_q *q = from_timer(q, t, u.out.timer); + + qdio_tasklet_schedule(q); +} + +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)) + qdio_tasklet_schedule(out); +} + +static void __tiqdio_inbound_processing(struct qdio_q *q) +{ + qperf_inc(q, tasklet_inbound); + if (need_siga_sync(q) && need_siga_sync_after_ai(q)) + qdio_sync_queues(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 (!qdio_tasklet_schedule(q)) + 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); + qdio_tasklet_schedule(q); + } +} + +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_ACTIVE)) + return; + + for_each_input_queue(irq_ptr, q, i) { + if (q->u.in.queue_start_poll) { + /* skip if polling is enabled or already in work */ + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) { + qperf_inc(q, int_discarded); + continue; + } + q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, + q->irq_ptr->int_parm); + } else { + 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 (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) + qdio_siga_sync_q(q); + qdio_tasklet_schedule(q); + } +} + +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; + int count; + + 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; + } + + count = sub_buf(q->first_to_check, q->first_to_kick); + q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, + q->nr, q->first_to_kick, count, irq_ptr->int_parm); +no_handler: + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); + /* + * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. + * Therefore we call the LGR detection function here. + */ + lgr_info_log(); +} + +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; + struct subchannel_id schid; + int cstat, dstat; + + if (!intparm || !irq_ptr) { + ccw_device_get_schid(cdev, &schid); + DBF_ERROR("qint:%4x", schid.sch_no); + return; + } + + if (irq_ptr->perf_stat_enabled) + irq_ptr->perf_stat.qdio_int++; + + if (IS_ERR(irb)) { + 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; + } + 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_ONCE(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) +{ + struct subchannel_id schid; + + if (!cdev || !cdev->private) + return -EINVAL; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("get ssqd:%4x", schid.sch_no); + return qdio_setup_get_ssqd(NULL, &schid, data); +} +EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); + +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_sync(&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; + struct subchannel_id schid; + int rc; + + if (!irq_ptr) + return -ENODEV; + + WARN_ON_ONCE(irqs_disabled()); + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qshutdown:%4x", 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); + + /* cleanup subchannel */ + spin_lock_irq(get_ccwdev_lock(cdev)); + + 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_irq(get_ccwdev_lock(cdev)); + 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_irq(get_ccwdev_lock(cdev)); + +no_cleanup: + qdio_shutdown_thinint(irq_ptr); + + /* restore interrupt handler */ + if ((void *)cdev->handler == (void *)qdio_int_handler) { + cdev->handler = irq_ptr->orig_handler; + cdev->private->intparm = 0; + } + spin_unlock_irq(get_ccwdev_lock(cdev)); + + 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; + struct subchannel_id schid; + + if (!irq_ptr) + return -ENODEV; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qfree:%4x", schid.sch_no); + DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); + mutex_lock(&irq_ptr->setup_mutex); + + 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_allocate - allocate qdio queues and associated data + * @init_data: initialization data + */ +int qdio_allocate(struct qdio_initialize *init_data) +{ + struct subchannel_id schid; + struct qdio_irq *irq_ptr; + + ccw_device_get_schid(init_data->cdev, &schid); + DBF_EVENT("qallocate:%4x", 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); + if (qdio_allocate_dbf(init_data, irq_ptr)) + goto out_rel; + + /* + * 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; + + 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); + +static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q = irq_ptr->input_qs[0]; + int i, use_cq = 0; + + if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) + use_cq = 1; + + for_each_output_queue(irq_ptr, q, i) { + if (use_cq) { + if (qdio_enable_async_operation(&q->u.out) < 0) { + use_cq = 0; + continue; + } + } else + qdio_disable_async_operation(&q->u.out); + } + DBF_EVENT("use_cq:%d", use_cq); +} + +/** + * qdio_establish - establish queues on a qdio subchannel + * @init_data: initialization data + */ +int qdio_establish(struct qdio_initialize *init_data) +{ + struct ccw_device *cdev = init_data->cdev; + struct subchannel_id schid; + struct qdio_irq *irq_ptr; + int rc; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qestablish:%4x", schid.sch_no); + + irq_ptr = cdev->private->qdio_data; + if (!irq_ptr) + return -ENODEV; + + 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_irq(get_ccwdev_lock(cdev)); + ccw_device_set_options_mask(cdev, 0); + + rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); + spin_unlock_irq(get_ccwdev_lock(cdev)); + if (rc) { + DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%4x", 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); + + qdio_detect_hsicq(irq_ptr); + + /* 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 subchannel_id schid; + struct qdio_irq *irq_ptr; + int rc; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qactivate:%4x", schid.sch_no); + + irq_ptr = cdev->private->qdio_data; + if (!irq_ptr) + return -ENODEV; + + 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_irq(get_ccwdev_lock(cdev)); + ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); + + rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, + 0, DOIO_DENY_PREFETCH); + spin_unlock_irq(get_ccwdev_lock(cdev)); + if (rc) { + DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%4x", 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 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); + atomic_add(count, &q->nr_buf_used); + + 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 = 0; + 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); + + if (used == QDIO_MAX_BUFFERS_PER_Q) + qperf_inc(q, outbound_queue_full); + + 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) { + unsigned long phys_aob = 0; + + /* One SIGA-W per buffer required for unicast HSI */ + WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); + + phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); + + rc = qdio_kick_outbound_q(q, phys_aob); + } else if (need_siga_sync(q)) { + rc = qdio_siga_sync_q(q); + } else if (count < QDIO_MAX_BUFFERS_PER_Q && + get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 && + state == SLSB_CU_OUTPUT_PRIMED) { + /* The previous buffer is not processed yet, tack on. */ + qperf_inc(q, fast_requeue); + } else { + rc = qdio_kick_outbound_q(q, 0); + } + + /* in case of SIGA errors we must process the error immediately */ + if (used >= q->u.out.scan_threshold || rc) + qdio_tasklet_schedule(q); + else + /* free the SBALs in case of no further traffic */ + if (!timer_pending(&q->u.out.timer) && + likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) + mod_timer(&q->u.out.timer, jiffies + HZ); + 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 -EIO; + if (!count) + return 0; + 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); + +/** + * qdio_start_irq - process input buffers + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * + * Return codes + * 0 - success + * 1 - irqs not started since new data is available + */ +int qdio_start_irq(struct ccw_device *cdev, int nr) +{ + struct qdio_q *q; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + clear_nonshared_ind(irq_ptr); + qdio_stop_polling(q); + clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); + + /* + * We need to check again to not lose initiative after + * resetting the ACK state. + */ + if (test_nonshared_ind(irq_ptr)) + goto rescan; + if (!qdio_inbound_q_done(q)) + goto rescan; + return 0; + +rescan: + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) + return 0; + else + return 1; + +} +EXPORT_SYMBOL(qdio_start_irq); + +/** + * qdio_get_next_buffers - process input buffers + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * @bufnr: first filled buffer number + * @error: buffers are in error state + * + * Return codes + * < 0 - error + * = 0 - no new buffers found + * > 0 - number of processed buffers + */ +int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, + int *error) +{ + struct qdio_q *q; + int start, end; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + /* + * Cannot rely on automatic sync after interrupt since queues may + * also be examined without interrupt. + */ + if (need_siga_sync(q)) + qdio_sync_queues(q); + + /* check the PCI capable outbound queues. */ + qdio_check_outbound_after_thinint(q); + + if (!qdio_inbound_q_moved(q)) + return 0; + + /* Note: upper-layer MUST stop processing immediately here ... */ + if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) + return -EIO; + + start = q->first_to_kick; + end = q->first_to_check; + *bufnr = start; + *error = q->qdio_error; + + /* for the next time */ + q->first_to_kick = end; + q->qdio_error = 0; + return sub_buf(end, start); +} +EXPORT_SYMBOL(qdio_get_next_buffers); + +/** + * qdio_stop_irq - disable interrupt processing for the device + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * + * Return codes + * 0 - interrupts were already disabled + * 1 - interrupts successfully disabled + */ +int qdio_stop_irq(struct ccw_device *cdev, int nr) +{ + struct qdio_q *q; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) + return 0; + else + return 1; +} +EXPORT_SYMBOL(qdio_stop_irq); + +/** + * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. + * @schid: Subchannel ID. + * @cnc: Boolean Change-Notification Control + * @response: Response code will be stored at this address + * @cb: Callback function will be executed for each element + * of the address list + * @priv: Pointer to pass to the callback function. + * + * Performs "Store-network-bridging-information list" operation and calls + * the callback function for every entry in the list. If "change- + * notification-control" is set, further changes in the address list + * will be reported via the IPA command. + */ +int qdio_pnso_brinfo(struct subchannel_id schid, + int cnc, u16 *response, + void (*cb)(void *priv, enum qdio_brinfo_entry_type type, + void *entry), + void *priv) +{ + struct chsc_pnso_area *rr; + int rc; + u32 prev_instance = 0; + int isfirstblock = 1; + int i, size, elems; + + rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); + if (rr == NULL) + return -ENOMEM; + do { + /* on the first iteration, naihdr.resume_token will be zero */ + rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); + if (rc != 0 && rc != -EBUSY) + goto out; + if (rr->response.code != 1) { + rc = -EIO; + continue; + } else + rc = 0; + + if (cb == NULL) + continue; + + size = rr->naihdr.naids; + elems = (rr->response.length - + sizeof(struct chsc_header) - + sizeof(struct chsc_brinfo_naihdr)) / + size; + + if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { + /* Inform the caller that they need to scrap */ + /* the data that was already reported via cb */ + rc = -EAGAIN; + break; + } + isfirstblock = 0; + prev_instance = rr->naihdr.instance; + for (i = 0; i < elems; i++) + switch (size) { + case sizeof(struct qdio_brinfo_entry_l3_ipv6): + (*cb)(priv, l3_ipv6_addr, + &rr->entries.l3_ipv6[i]); + break; + case sizeof(struct qdio_brinfo_entry_l3_ipv4): + (*cb)(priv, l3_ipv4_addr, + &rr->entries.l3_ipv4[i]); + break; + case sizeof(struct qdio_brinfo_entry_l2): + (*cb)(priv, l2_addr_lnid, + &rr->entries.l2[i]); + break; + default: + WARN_ON_ONCE(1); + rc = -EIO; + goto out; + } + } while (rr->response.code == 0x0107 || /* channel busy */ + (rr->response.code == 1 && /* list stored */ + /* resume token is non-zero => list incomplete */ + (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); + (*response) = rr->response.code; + +out: + free_page((unsigned long)rr); + return rc; +} +EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); + +static int __init init_QDIO(void) +{ + int rc; + + rc = qdio_debug_init(); + if (rc) + return rc; + rc = qdio_setup_init(); + if (rc) + goto out_debug; + rc = tiqdio_allocate_memory(); + if (rc) + goto out_cache; + rc = tiqdio_register_thinints(); + if (rc) + goto out_ti; + return 0; + +out_ti: + tiqdio_free_memory(); +out_cache: + qdio_setup_exit(); +out_debug: + qdio_debug_exit(); + return rc; +} + +static void __exit exit_QDIO(void) +{ + tiqdio_unregister_thinints(); + tiqdio_free_memory(); + qdio_setup_exit(); + qdio_debug_exit(); +} + +module_init(init_QDIO); +module_exit(exit_QDIO); |