From: Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>
List of major changes:
- split qdio driver into several files
- seperation of thin interrupt code
- improved handling for multiple thin interrupt devices
- inbound and outbound processing now always runs in tasklet context
- significant less tasklet schedules per interrupt needed
- merged qebsm with non-qebsm handling
- cleanup qdio interface and added kerneldoc
- coding style
Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Reviewed-by: Utz Bacher <utz.bacher@xxxxxxxxxx>
Reviewed-by: Ursula Braun <braunu@xxxxxxxxxx>
Signed-off-by: Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---
drivers/s390/cio/qdio_main.c | 1760 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1760 insertions(+)
Index: quilt-2.6/drivers/s390/cio/qdio_main.c
===================================================================
--- /dev/null
+++ quilt-2.6/drivers/s390/cio/qdio_main.c
@@ -0,0 +1,1760 @@
+/*
+ * 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@xxxxxxxxxx>
+ * Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>
+ * 2.6 cio integration by Cornelia Huck <cornelia.huck@xxxxxxxxxx>
+ */
+#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@xxxxxxxxxx>,"\
+ "Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>");
+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];
+
+ 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];
+
+ 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 state to initial state */
+void qdio_init_buf_states(struct qdio_q *q)
+{
+ if (q->is_input_q)
+ set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
+ QDIO_MAX_BUFFERS_PER_Q);
+ else
+ 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 (!atomic_xchg(&q->u.in.polling, 0)) {
+ spin_unlock_bh(&q->u.in.lock);
+ return;
+ }
+ 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 (!atomic_read(&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 (atomic_read(&q->u.in.polling))
+ state = SLSB_P_INPUT_NOT_INIT;
+ else {
+ atomic_set(&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 {
+ QDIO_DBF_TEXT4(0, trace, "inhsntmv");
+ QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+ 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 {
+ QDIO_DBF_TEXT4(0, trace, "oqhsntmv");
+ QDIO_DBF_HEX4(0, trace, &q, sizeof(void *));
+ 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);
+
+ 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 == -ENODEV) {
+ /* no need to wait for a no longer present device */
+ qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
+ goto no_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);
+ spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
+ goto out;
+ }
+
+ if ((void *)cdev->handler != (void *)qdio_int_handler) {
+ /*
+ * Whoever put another handler there, has to cope with the
+ * interrupt theirself. Might happen if qdio_shutdown was
+ * called on already shutdown queues, but this shouldn't have
+ * bad side effects.
+ */
+ qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
+ 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 handlers, if necessary */
+ if ((void *)cdev->handler == (void *)qdio_int_handler)
+ cdev->handler = irq_ptr->orig_handler;
+ spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
+
+ /* ignore errors */
+ qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
+out:
+ 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;
+ 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);
+ module_put(THIS_MODULE);
+ 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 = (void *) get_zeroed_page(GFP_KERNEL);
+ 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;
+
+ irq_ptr->qdr = kzalloc(sizeof(struct qdr), GFP_KERNEL);
+ 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;
+
+ 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;
+ }
+
+ sprintf(dbf_text, "qest%4x", cdev->private->schid.sch_no);
+ QDIO_DBF_TEXT0(0, setup, dbf_text);
+ QDIO_DBF_TEXT0(0, trace, dbf_text);
+
+ /* 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);
+
+ 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 (atomic_read(&q->u.in.polling))
+ if (buf_in_between(q->last_move_ftc, bufnr, count))
+ atomic_xchg(&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);
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
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