Merge branch 'linus' into xen-64bit

1 files changed, 1755 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
new file mode 100644
index 000000000000..d10c73cc1688
--- /dev/null
+++ b/drivers/s390/cio/qdio_main.c
@@ -0,0 +1,1755 @@
+/*
+ * 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 <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 <asm/atomic.h>
+#include <asm/debug.h>
+#include <asm/qdio.h>
+
+#include "cio.h"
+#include "css.h"
+#include "device.h"
+#include "qdio.h"
+#include "qdio_debug.h"
+#include "qdio_perf.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(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,
+                                 u32 *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)
+{
+        char dbf_text[15];
+
+        /* 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 */
+        sprintf(dbf_text, "%d", ccq);
+        QDIO_DBF_TEXT2(1, trace, dbf_text);
+        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
+ *
+ * Returns the number of successfull 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)
+{
+        unsigned int ccq = 0;
+        int tmp_count = count, tmp_start = start;
+        int nr = q->nr;
+        int rc;
+        char dbf_text[15];
+
+        BUG_ON(!q->irq_ptr->sch_token);
+
+        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);
+        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))
+                return (count - tmp_count);
+        if (rc == 1) {
+                QDIO_DBF_TEXT5(1, trace, "eqAGAIN");
+                goto again;
+        }
+
+        if (rc < 0) {
+                QDIO_DBF_TEXT2(1, trace, "eqberr");
+                sprintf(dbf_text, "%2x,%2x,%d,%d", count, tmp_count, ccq, nr);
+                QDIO_DBF_TEXT2(1, trace, dbf_text);
+                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;
+        char dbf_text[15];
+
+        BUG_ON(!q->irq_ptr->sch_token);
+
+        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) {
+                QDIO_DBF_TEXT5(1, trace, "sqAGAIN");
+                goto again;
+        }
+        if (rc < 0) {
+                QDIO_DBF_TEXT3(1, trace, "sqberr");
+                sprintf(dbf_text, "%2x,%2x", count, tmp_count);
+                QDIO_DBF_TEXT3(1, trace, dbf_text);
+                sprintf(dbf_text, "%d,%d", ccq, nr);
+                QDIO_DBF_TEXT3(1, trace, dbf_text);
+
+                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)
+{
+        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);
+
+        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;
+}
+
+inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
+                  unsigned char *state)
+{
+        return get_buf_states(q, bufnr, state, 1);
+}
+
+/* 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 int qdio_siga_sync(struct qdio_q *q, unsigned int output,
+                          unsigned int input)
+{
+        int cc;
+
+        if (!need_siga_sync(q))
+                return 0;
+
+        qdio_perf_stat_inc(&perf_stats.siga_sync);
+
+        cc = do_siga_sync(q->irq_ptr->schid, output, input);
+        if (cc) {
+                QDIO_DBF_TEXT4(0, trace, "sigasync");
+                QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+                QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
+        }
+        return cc;
+}
+
+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 inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
+{
+        unsigned int fc = 0;
+        unsigned long schid;
+
+        if (!is_qebsm(q))
+                schid = *((u32 *)&q->irq_ptr->schid);
+        else {
+                schid = q->irq_ptr->sch_token;
+                fc |= 0x80;
+        }
+        return do_siga_output(schid, q->mask, busy_bit, fc);
+}
+
+static int qdio_siga_output(struct qdio_q *q)
+{
+        int cc;
+        u32 busy_bit;
+        u64 start_time = 0;
+
+        QDIO_DBF_TEXT5(0, trace, "sigaout");
+        QDIO_DBF_HEX5(0, trace, &q, sizeof(void *));
+
+        qdio_perf_stat_inc(&perf_stats.siga_out);
+again:
+        cc = qdio_do_siga_output(q, &busy_bit);
+        if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) {
+                if (!start_time)
+                        start_time = get_usecs();
+                else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
+                        goto again;
+        }
+
+        if (cc == 2 && busy_bit)
+                cc |= QDIO_ERROR_SIGA_BUSY;
+        if (cc)
+                QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
+        return cc;
+}
+
+static inline int qdio_siga_input(struct qdio_q *q)
+{
+        int cc;
+
+        QDIO_DBF_TEXT4(0, trace, "sigain");
+        QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+
+        qdio_perf_stat_inc(&perf_stats.siga_in);
+
+        cc = do_siga_input(q->irq_ptr->schid, q->mask);
+        if (cc)
+                QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *));
+        return cc;
+}
+
+/* called from thinint inbound handler */
+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);
+}
+
+inline void qdio_stop_polling(struct qdio_q *q)
+{
+        spin_lock_bh(&q->u.in.lock);
+        if (!q->u.in.polling) {
+                spin_unlock_bh(&q->u.in.lock);
+                return;
+        }
+        q->u.in.polling = 0;
+        qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
+
+        /* show the card that we are not polling anymore */
+        set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
+        spin_unlock_bh(&q->u.in.lock);
+}
+
+static void announce_buffer_error(struct qdio_q *q)
+{
+        char dbf_text[15];
+
+        if (q->is_input_q)
+                QDIO_DBF_TEXT3(1, trace, "inperr");
+        else
+                QDIO_DBF_TEXT3(0, trace, "outperr");
+
+        sprintf(dbf_text, "%x-%x-%x", q->first_to_check,
+                q->sbal[q->first_to_check]->element[14].flags,
+                q->sbal[q->first_to_check]->element[15].flags);
+        QDIO_DBF_TEXT3(1, trace, dbf_text);
+        QDIO_DBF_HEX2(1, trace, q->sbal[q->first_to_check], 256);
+
+        q->qdio_error = QDIO_ERROR_SLSB_STATE;
+}
+
+static int get_inbound_buffer_frontier(struct qdio_q *q)
+{
+        int count, stop;
+        unsigned char state;
+
+        /*
+         * If we still poll don't update last_move_ftc, keep the
+         * previously ACK buffer there.
+         */
+        if (!q->u.in.polling)
+                q->last_move_ftc = q->first_to_check;
+
+        /*
+         * 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);
+
+        /*
+         * No siga sync here, as a PCI or we after a thin interrupt
+         * will sync the queues.
+         */
+
+        /* need to set count to 1 for non-qebsm */
+        if (!is_qebsm(q))
+                count = 1;
+
+check_next:
+        if (q->first_to_check == stop)
+                goto out;
+
+        count = get_buf_states(q, q->first_to_check, &state, count);
+        if (!count)
+                goto out;
+
+        switch (state) {
+        case SLSB_P_INPUT_PRIMED:
+                QDIO_DBF_TEXT5(0, trace, "inptprim");
+
+                /*
+                 * Only ACK the first buffer. The ACK will be removed in
+                 * qdio_stop_polling.
+                 */
+                if (q->u.in.polling)
+                        state = SLSB_P_INPUT_NOT_INIT;
+                else {
+                        q->u.in.polling = 1;
+                        state = SLSB_P_INPUT_ACK;
+                }
+                set_buf_state(q, q->first_to_check, state);
+
+                /*
+                 * Need to change all PRIMED buffers to NOT_INIT, otherwise
+                 * we're loosing initiative in the thinint code.
+                 */
+                if (count > 1)
+                        set_buf_states(q, next_buf(q->first_to_check),
+                                       SLSB_P_INPUT_NOT_INIT, count - 1);
+
+                /*
+                 * No siga-sync needed for non-qebsm here, as the inbound queue
+                 * will be synced on the next siga-r, resp.
+                 * tiqdio_is_inbound_q_done will do the siga-sync.
+                 */
+                q->first_to_check = add_buf(q->first_to_check, count);
+                atomic_sub(count, &q->nr_buf_used);
+                goto check_next;
+        case SLSB_P_INPUT_ERROR:
+                announce_buffer_error(q);
+                /* 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);
+                break;
+        case SLSB_CU_INPUT_EMPTY:
+        case SLSB_P_INPUT_NOT_INIT:
+        case SLSB_P_INPUT_ACK:
+                QDIO_DBF_TEXT5(0, trace, "inpnipro");
+                break;
+        default:
+                BUG();
+        }
+out:
+        QDIO_DBF_HEX4(0, trace, &q->first_to_check, sizeof(int));
+        return q->first_to_check;
+}
+
+int qdio_inbound_q_moved(struct qdio_q *q)
+{
+        int bufnr;
+
+        bufnr = get_inbound_buffer_frontier(q);
+
+        if ((bufnr != q->last_move_ftc) || q->qdio_error) {
+                if (!need_siga_sync(q) && !pci_out_supported(q))
+                        q->u.in.timestamp = get_usecs();
+
+                QDIO_DBF_TEXT4(0, trace, "inhasmvd");
+                QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+                return 1;
+        } else
+                return 0;
+}
+
+static int qdio_inbound_q_done(struct qdio_q *q)
+{
+        unsigned char state;
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[15];
+#endif
+
+        if (!atomic_read(&q->nr_buf_used))
+                return 1;
+
+        /*
+         * We need that one for synchronization with the adapter, as it
+         * does a kind of PCI avoidance.
+         */
+        qdio_siga_sync_q(q);
+
+        get_buf_state(q, q->first_to_check, &state);
+        if (state == SLSB_P_INPUT_PRIMED)
+                /* we got something to do */
+                return 0;
+
+        /* on VM, we don't poll, so the q is always done here */
+        if (need_siga_sync(q) || pci_out_supported(q))
+                return 1;
+
+        /*
+         * At this point we know, that inbound first_to_check
+         * has (probably) not moved (see qdio_inbound_processing).
+         */
+        if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
+#ifdef CONFIG_QDIO_DEBUG
+                QDIO_DBF_TEXT4(0, trace, "inqisdon");
+                QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+                sprintf(dbf_text, "pf%02x", q->first_to_check);
+                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%02x", q->first_to_check);
+                QDIO_DBF_TEXT4(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+                return 0;
+        }
+}
+
+void qdio_kick_inbound_handler(struct qdio_q *q)
+{
+        int count, start, end;
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[15];
+#endif
+
+        qdio_perf_stat_inc(&perf_stats.inbound_handler);
+
+        start = q->first_to_kick;
+        end = q->first_to_check;
+        if (end >= start)
+                count = end - start;
+        else
+                count = end + QDIO_MAX_BUFFERS_PER_Q - start;
+
+#ifdef CONFIG_QDIO_DEBUG
+        sprintf(dbf_text, "s=%2xc=%2x", start, count);
+        QDIO_DBF_TEXT4(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+
+        if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
+                return;
+
+        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 = q->first_to_check;
+        q->qdio_error = 0;
+}
+
+static void __qdio_inbound_processing(struct qdio_q *q)
+{
+        qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
+again:
+        if (!qdio_inbound_q_moved(q))
+                return;
+
+        qdio_kick_inbound_handler(q);
+
+        if (!qdio_inbound_q_done(q))
+                /* means poll time is not yet over */
+                goto again;
+
+        qdio_stop_polling(q);
+        /*
+         * We need to check again to not lose initiative after
+         * resetting the ACK state.
+         */
+        if (!qdio_inbound_q_done(q))
+                goto again;
+}
+
+/* inbound 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);
+
+        /* need to set count to 1 for non-qebsm */
+        if (!is_qebsm(q))
+                count = 1;
+
+check_next:
+        if (q->first_to_check == stop)
+                return q->first_to_check;
+
+        count = get_buf_states(q, q->first_to_check, &state, count);
+        if (!count)
+                return q->first_to_check;
+
+        switch (state) {
+        case SLSB_P_OUTPUT_EMPTY:
+                /* the adapter got it */
+                QDIO_DBF_TEXT5(0, trace, "outpempt");
+
+                atomic_sub(count, &q->nr_buf_used);
+                q->first_to_check = add_buf(q->first_to_check, count);
+                /*
+                 * We fetch all buffer states at once. get_buf_states may
+                 * return count < stop. For QEBSM we do not loop.
+                 */
+                if (is_qebsm(q))
+                        break;
+                goto check_next;
+        case SLSB_P_OUTPUT_ERROR:
+                announce_buffer_error(q);
+                /* 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);
+                break;
+        case SLSB_CU_OUTPUT_PRIMED:
+                /* the adapter has not fetched the output yet */
+                QDIO_DBF_TEXT5(0, trace, "outpprim");
+                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_ftc) || q->qdio_error) {
+                q->last_move_ftc = bufnr;
+                QDIO_DBF_TEXT4(0, trace, "oqhasmvd");
+                QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+                return 1;
+        } else
+                return 0;
+}
+
+/*
+ * VM could present us cc=2 and busy bit set on SIGA-write
+ * during reconfiguration of their Guest LAN (only in iqdio mode,
+ * otherwise qdio is asynchronous and cc=2 and busy bit there will take
+ * the queues down immediately).
+ *
+ * Therefore qdio_siga_output will try for a short time constantly,
+ * if such a condition occurs. If it doesn't change, it will
+ * increase the busy_siga_counter and save the timestamp, and
+ * schedule the queue for later processing. qdio_outbound_processing
+ * will check out the counter. If non-zero, it will call qdio_kick_outbound_q
+ * as often as the value of the counter. This will attempt further SIGA
+ * instructions. For each successful SIGA, the counter is
+ * decreased, for failing SIGAs the counter remains the same, after
+ * all. After some time of no movement, qdio_kick_outbound_q will
+ * finally fail and reflect corresponding error codes to call
+ * the upper layer module and have it take the queues down.
+ *
+ * Note that this is a change from the original HiperSockets design
+ * (saying cc=2 and busy bit means take the queues down), but in
+ * these days Guest LAN didn't exist... excessive cc=2 with busy bit
+ * conditions will still take the queues down, but the threshold is
+ * higher due to the Guest LAN environment.
+ *
+ * Called from outbound tasklet and do_QDIO handler.
+ */
+static void qdio_kick_outbound_q(struct qdio_q *q)
+{
+        int rc;
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[15];
+
+        QDIO_DBF_TEXT5(0, trace, "kickoutq");
+        QDIO_DBF_HEX5(0, trace, &q, sizeof(void *));
+#endif /* CONFIG_QDIO_DEBUG */
+
+        if (!need_siga_out(q))
+                return;
+
+        rc = qdio_siga_output(q);
+        switch (rc) {
+        case 0:
+                /* went smooth this time, reset timestamp */
+                q->u.out.timestamp = 0;
+
+                /* TODO: improve error handling for CC=0 case */
+#ifdef CONFIG_QDIO_DEBUG
+                QDIO_DBF_TEXT3(0, trace, "cc2reslv");
+                sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no, q->nr,
+                        atomic_read(&q->u.out.busy_siga_counter));
+                QDIO_DBF_TEXT3(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+                break;
+        /* cc=2 and busy bit */
+        case (2 | QDIO_ERROR_SIGA_BUSY):
+                atomic_inc(&q->u.out.busy_siga_counter);
+
+                /* if the last siga was successful, save timestamp here */
+                if (!q->u.out.timestamp)
+                        q->u.out.timestamp = get_usecs();
+
+                /* if we're in time, don't touch qdio_error */
+                if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) {
+                        tasklet_schedule(&q->tasklet);
+                        break;
+                }
+                QDIO_DBF_TEXT2(0, trace, "cc2REPRT");
+#ifdef CONFIG_QDIO_DEBUG
+                sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no, q->nr,
+                        atomic_read(&q->u.out.busy_siga_counter));
+                QDIO_DBF_TEXT3(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+        default:
+                /* for plain cc=1, 2 or 3 */
+                q->qdio_error = rc;
+        }
+}
+
+static void qdio_kick_outbound_handler(struct qdio_q *q)
+{
+        int start, end, count;
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[15];
+#endif
+
+        start = q->first_to_kick;
+        end = q->last_move_ftc;
+        if (end >= start)
+                count = end - start;
+        else
+                count = end + QDIO_MAX_BUFFERS_PER_Q - start;
+
+#ifdef CONFIG_QDIO_DEBUG
+        QDIO_DBF_TEXT4(0, trace, "kickouth");
+        QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+
+        sprintf(dbf_text, "s=%2xc=%2x", start, count);
+        QDIO_DBF_TEXT4(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+
+        if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
+                return;
+
+        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 = q->last_move_ftc;
+        q->qdio_error = 0;
+}
+
+static void __qdio_outbound_processing(struct qdio_q *q)
+{
+        int siga_attempts;
+
+        qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
+
+        /* see comment in qdio_kick_outbound_q */
+        siga_attempts = atomic_read(&q->u.out.busy_siga_counter);
+        while (siga_attempts--) {
+                atomic_dec(&q->u.out.busy_siga_counter);
+                qdio_kick_outbound_q(q);
+        }
+
+        BUG_ON(atomic_read(&q->nr_buf_used) < 0);
+
+        if (qdio_outbound_q_moved(q))
+                qdio_kick_outbound_handler(q);
+
+        if (queue_type(q) == QDIO_ZFCP_QFMT) {
+                if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
+                        tasklet_schedule(&q->tasklet);
+                return;
+        }
+
+        /* bail out for HiperSockets unicast queues */
+        if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
+                return;
+
+        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);
+                        qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
+                }
+        }
+}
+
+/* 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;
+        tasklet_schedule(&q->tasklet);
+}
+
+/* called from thinint inbound tasklet */
+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 inline void qdio_set_state(struct qdio_irq *irq_ptr,
+                                  enum qdio_irq_states state)
+{
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[15];
+
+        QDIO_DBF_TEXT5(0, trace, "newstate");
+        sprintf(dbf_text, "%4x%4x", irq_ptr->schid.sch_no, state);
+        QDIO_DBF_TEXT5(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+
+        irq_ptr->state = state;
+        mb();
+}
+
+static void qdio_irq_check_sense(struct subchannel_id schid, struct irb *irb)
+{
+        char dbf_text[15];
+
+        if (irb->esw.esw0.erw.cons) {
+                sprintf(dbf_text, "sens%4x", schid.sch_no);
+                QDIO_DBF_TEXT2(1, trace, dbf_text);
+                QDIO_DBF_HEX0(0, trace, irb, 64);
+                QDIO_DBF_HEX0(0, trace, irb->ecw, 64);
+        }
+}
+
+/* PCI interrupt handler */
+static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
+{
+        int i;
+        struct qdio_q *q;
+
+        qdio_perf_stat_inc(&perf_stats.pci_int);
+
+        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;
+        char dbf_text[15];
+
+        QDIO_DBF_TEXT2(1, trace, "ick2");
+        sprintf(dbf_text, "%s", cdev->dev.bus_id);
+        QDIO_DBF_TEXT2(1, trace, dbf_text);
+        QDIO_DBF_HEX2(0, trace, &intparm, sizeof(int));
+        QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int));
+        QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int));
+
+        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_call_shutdown(struct work_struct *work)
+{
+        struct ccw_device_private *priv;
+        struct ccw_device *cdev;
+
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
+        qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
+        put_device(&cdev->dev);
+}
+
+static void qdio_int_error(struct ccw_device *cdev)
+{
+        struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+
+        switch (irq_ptr->state) {
+        case QDIO_IRQ_STATE_INACTIVE:
+        case QDIO_IRQ_STATE_CLEANUP:
+                qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
+                break;
+        case QDIO_IRQ_STATE_ESTABLISHED:
+        case QDIO_IRQ_STATE_ACTIVE:
+                qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
+                if (get_device(&cdev->dev)) {
+                        /* Can't call shutdown from interrupt context. */
+                        PREPARE_WORK(&cdev->private->kick_work,
+                                     qdio_call_shutdown);
+                        queue_work(ccw_device_work, &cdev->private->kick_work);
+                }
+                break;
+        default:
+                WARN_ON(1);
+        }
+        wake_up(&cdev->private->wait_q);
+}
+
+static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
+                                           int dstat)
+{
+        struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+
+        if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
+                QDIO_DBF_TEXT2(1, setup, "eq:ckcon");
+                goto error;
+        }
+
+        if (!(dstat & DEV_STAT_DEV_END)) {
+                QDIO_DBF_TEXT2(1, setup, "eq:no de");
+                goto error;
+        }
+
+        if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
+                QDIO_DBF_TEXT2(1, setup, "eq:badio");
+                goto error;
+        }
+        return 0;
+error:
+        QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int));
+        QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int));
+        qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
+        return 1;
+}
+
+static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
+                                      int dstat)
+{
+        struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+        char dbf_text[15];
+
+        sprintf(dbf_text, "qehi%4x", cdev->private->schid.sch_no);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+        QDIO_DBF_TEXT0(0, trace, dbf_text);
+
+        if (!qdio_establish_check_errors(cdev, cstat, dstat))
+                qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
+}
+
+/* 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;
+        char dbf_text[15];
+
+        qdio_perf_stat_inc(&perf_stats.qdio_int);
+
+        if (!intparm || !irq_ptr) {
+                sprintf(dbf_text, "qihd%4x", cdev->private->schid.sch_no);
+                QDIO_DBF_TEXT2(1, setup, dbf_text);
+                return;
+        }
+
+        if (IS_ERR(irb)) {
+                switch (PTR_ERR(irb)) {
+                case -EIO:
+                        sprintf(dbf_text, "ierr%4x",
+                                cdev->private->schid.sch_no);
+                        QDIO_DBF_TEXT2(1, setup, dbf_text);
+                        qdio_int_error(cdev);
+                        return;
+                case -ETIMEDOUT:
+                        sprintf(dbf_text, "qtoh%4x",
+                                cdev->private->schid.sch_no);
+                        QDIO_DBF_TEXT2(1, setup, dbf_text);
+                        qdio_int_error(cdev);
+                        return;
+                default:
+                        WARN_ON(1);
+                        return;
+                }
+        }
+        qdio_irq_check_sense(irq_ptr->schid, 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);
+                        /* no state change so no need to wake up wait_q */
+                        return;
+                }
+                if ((cstat & ~SCHN_STAT_PCI) || dstat) {
+                        qdio_handle_activate_check(cdev, intparm, cstat,
+                                                   dstat);
+                        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
+ *
+ * Returns a pointer to the saved qdio subchannel description,
+ * or NULL for not setup qdio devices.
+ */
+struct qdio_ssqd_desc *qdio_get_ssqd_desc(struct ccw_device *cdev)
+{
+        struct qdio_irq *irq_ptr;
+
+        QDIO_DBF_TEXT0(0, setup, "getssqd");
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return NULL;
+
+        return &irq_ptr->ssqd_desc;
+}
+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 on success qdio_free() for @cdev.
+ */
+int qdio_cleanup(struct ccw_device *cdev, int how)
+{
+        struct qdio_irq *irq_ptr;
+        char dbf_text[15];
+        int rc;
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return -ENODEV;
+
+        sprintf(dbf_text, "qcln%4x", irq_ptr->schid.sch_no);
+        QDIO_DBF_TEXT1(0, trace, dbf_text);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+
+        rc = qdio_shutdown(cdev, how);
+        if (rc == 0)
+                rc = 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_disable(&q->tasklet);
+
+        for_each_output_queue(irq_ptr, q, i) {
+                tasklet_disable(&q->tasklet);
+                del_timer(&q->u.out.timer);
+        }
+}
+
+/**
+ * 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;
+        int rc;
+        unsigned long flags;
+        char dbf_text[15];
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return -ENODEV;
+
+        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;
+        }
+
+        sprintf(dbf_text, "qsqs%4x", irq_ptr->schid.sch_no);
+        QDIO_DBF_TEXT1(0, trace, dbf_text);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+
+        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) {
+                sprintf(dbf_text, "sher%4x", irq_ptr->schid.sch_no);
+                QDIO_DBF_TEXT0(0, setup, dbf_text);
+                sprintf(dbf_text, "rc=%d", rc);
+                QDIO_DBF_TEXT0(0, setup, dbf_text);
+                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);
+        module_put(THIS_MODULE);
+        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;
+        char dbf_text[15];
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return -ENODEV;
+
+        mutex_lock(&irq_ptr->setup_mutex);
+
+        sprintf(dbf_text, "qfqs%4x", irq_ptr->schid.sch_no);
+        QDIO_DBF_TEXT1(0, trace, dbf_text);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+
+        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;
+        char dbf_text[15];
+
+        sprintf(dbf_text, "qini%4x", init_data->cdev->private->schid.sch_no);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+        QDIO_DBF_TEXT0(0, trace, dbf_text);
+
+        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;
+        char dbf_text[15];
+
+        sprintf(dbf_text, "qalc%4x", init_data->cdev->private->schid.sch_no);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+        QDIO_DBF_TEXT0(0, trace, dbf_text);
+
+        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;
+
+        qdio_allocate_do_dbf(init_data);
+
+        /* 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;
+        QDIO_DBF_TEXT0(0, setup, "irq_ptr:");
+        QDIO_DBF_HEX0(0, setup, &irq_ptr, sizeof(void *));
+
+        mutex_init(&irq_ptr->setup_mutex);
+
+        /*
+         * 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 = kzalloc(sizeof(struct qdr), GFP_KERNEL | GFP_DMA);
+        if (!irq_ptr->qdr)
+                goto out_rel;
+        WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
+
+        QDIO_DBF_TEXT0(0, setup, "qdr:");
+        QDIO_DBF_HEX0(0, setup, &irq_ptr->qdr, sizeof(void *));
+
+        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)
+{
+        char dbf_text[20];
+        struct qdio_irq *irq_ptr;
+        struct ccw_device *cdev = init_data->cdev;
+        unsigned long saveflags;
+        int rc;
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return -ENODEV;
+
+        if (cdev->private->state != DEV_STATE_ONLINE)
+                return -EINVAL;
+
+        if (!try_module_get(THIS_MODULE))
+                return -EINVAL;
+
+        sprintf(dbf_text, "qest%4x", cdev->private->schid.sch_no);
+        QDIO_DBF_TEXT0(0, setup, dbf_text);
+        QDIO_DBF_TEXT0(0, trace, dbf_text);
+
+        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) {
+                sprintf(dbf_text, "eq:io%4x", irq_ptr->schid.sch_no);
+                QDIO_DBF_TEXT2(1, setup, dbf_text);
+                sprintf(dbf_text, "eq:rc%4x", rc);
+                QDIO_DBF_TEXT2(1, setup, dbf_text);
+        }
+        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);
+        sprintf(dbf_text, "qib ac%2x", irq_ptr->qib.ac);
+        QDIO_DBF_TEXT2(0, setup, dbf_text);
+
+        /* 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;
+        char dbf_text[20];
+
+        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;
+        }
+
+        sprintf(dbf_text, "qact%4x", irq_ptr->schid.sch_no);
+        QDIO_DBF_TEXT2(0, setup, dbf_text);
+        QDIO_DBF_TEXT2(0, trace, dbf_text);
+
+        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) {
+                sprintf(dbf_text, "aq:io%4x", irq_ptr->schid.sch_no);
+                QDIO_DBF_TEXT2(1, setup, dbf_text);
+                sprintf(dbf_text, "aq:rc%4x", rc);
+                QDIO_DBF_TEXT2(1, setup, dbf_text);
+        }
+        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:
+                mutex_unlock(&irq_ptr->setup_mutex);
+                qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
+                return -EIO;
+        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 void handle_inbound(struct qdio_q *q, unsigned int callflags,
+                           int bufnr, int count)
+{
+        unsigned long flags;
+        int used, rc;
+
+        /*
+         * do_QDIO could run in parallel with the queue tasklet so the
+         * upper-layer programm could empty the ACK'ed buffer here.
+         * If that happens we must clear the polling flag, otherwise
+         * qdio_stop_polling() could set the buffer to NOT_INIT after
+         * it was set to EMPTY which would kill us.
+         */
+        spin_lock_irqsave(&q->u.in.lock, flags);
+        if (q->u.in.polling)
+                if (buf_in_between(q->last_move_ftc, bufnr, count))
+                        q->u.in.polling = 0;
+
+        count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
+        spin_unlock_irqrestore(&q->u.in.lock, flags);
+
+        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;
+
+        if (need_siga_in(q)) {
+                rc = qdio_siga_input(q);
+                if (rc)
+                        q->qdio_error = rc;
+        }
+}
+
+/**
+ * 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 void handle_outbound(struct qdio_q *q, unsigned int callflags,
+                            int bufnr, int count)
+{
+        unsigned char state;
+        int used;
+
+        qdio_perf_stat_inc(&perf_stats.outbound_handler);
+
+        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;
+        else
+                q->u.out.pci_out_enabled = 0;
+
+        if (queue_type(q) == QDIO_IQDIO_QFMT) {
+                if (multicast_outbound(q))
+                        qdio_kick_outbound_q(q);
+                else
+                        /*
+                         * One siga-w per buffer required for unicast
+                         * HiperSockets.
+                         */
+                        while (count--)
+                                qdio_kick_outbound_q(q);
+                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);
+        if (state != SLSB_CU_OUTPUT_PRIMED)
+                qdio_kick_outbound_q(q);
+        else {
+                QDIO_DBF_TEXT5(0, trace, "fast-req");
+                qdio_perf_stat_inc(&perf_stats.fast_requeue);
+        }
+out:
+        /* Fixme: could wait forever if called from process context */
+        tasklet_schedule(&q->tasklet);
+}
+
+/**
+ * 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, int bufnr, int count)
+{
+        struct qdio_irq *irq_ptr;
+#ifdef CONFIG_QDIO_DEBUG
+        char dbf_text[20];
+
+        sprintf(dbf_text, "doQD%04x", cdev->private->schid.sch_no);
+        QDIO_DBF_TEXT3(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+
+        if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
+            (count > QDIO_MAX_BUFFERS_PER_Q) ||
+            (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
+                return -EINVAL;
+
+        if (!count)
+                return 0;
+
+        irq_ptr = cdev->private->qdio_data;
+        if (!irq_ptr)
+                return -ENODEV;
+
+#ifdef CONFIG_QDIO_DEBUG
+        if (callflags & QDIO_FLAG_SYNC_INPUT)
+                QDIO_DBF_HEX3(0, trace, &irq_ptr->input_qs[q_nr],
+                              sizeof(void *));
+        else
+                QDIO_DBF_HEX3(0, trace, &irq_ptr->output_qs[q_nr],
+                              sizeof(void *));
+
+        sprintf(dbf_text, "flag%04x", callflags);
+        QDIO_DBF_TEXT3(0, trace, dbf_text);
+        sprintf(dbf_text, "qi%02xct%02x", bufnr, count);
+        QDIO_DBF_TEXT3(0, trace, dbf_text);
+#endif /* CONFIG_QDIO_DEBUG */
+
+        if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
+                return -EBUSY;
+
+        if (callflags & QDIO_FLAG_SYNC_INPUT)
+                handle_inbound(irq_ptr->input_qs[q_nr],
+                               callflags, bufnr, count);
+        else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
+                handle_outbound(irq_ptr->output_qs[q_nr],
+                                callflags, bufnr, count);
+        else {
+                QDIO_DBF_TEXT3(1, trace, "doQD:inv");
+                return -EINVAL;
+        }
+        return 0;
+}
+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 = qdio_setup_perf_stats();
+        if (rc)
+                goto out_debug;
+        rc = tiqdio_register_thinints();
+        if (rc)
+                goto out_perf;
+        return 0;
+
+out_perf:
+        qdio_remove_perf_stats();
+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_remove_perf_stats();
+        qdio_debug_exit();
+        qdio_setup_exit();
+}
+
+module_init(init_QDIO);
+module_exit(exit_QDIO);