1596 строки
38 KiB
C
1596 строки
38 KiB
C
/*
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* linux/drivers/s390/cio/qdio_main.c
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*
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* Linux for s390 qdio support, buffer handling, qdio API and module support.
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*
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* Copyright 2000,2008 IBM Corp.
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* Author(s): Utz Bacher <utz.bacher@de.ibm.com>
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* Jan Glauber <jang@linux.vnet.ibm.com>
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* 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <asm/atomic.h>
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#include <asm/debug.h>
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#include <asm/qdio.h>
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#include "cio.h"
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#include "css.h"
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#include "device.h"
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#include "qdio.h"
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#include "qdio_debug.h"
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MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
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"Jan Glauber <jang@linux.vnet.ibm.com>");
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MODULE_DESCRIPTION("QDIO base support");
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MODULE_LICENSE("GPL");
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static inline int do_siga_sync(struct subchannel_id schid,
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unsigned int out_mask, unsigned int in_mask)
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{
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register unsigned long __fc asm ("0") = 2;
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register struct subchannel_id __schid asm ("1") = schid;
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register unsigned long out asm ("2") = out_mask;
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register unsigned long in asm ("3") = in_mask;
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int cc;
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asm volatile(
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" siga 0\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc)
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: "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
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return cc;
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}
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static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
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{
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register unsigned long __fc asm ("0") = 1;
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register struct subchannel_id __schid asm ("1") = schid;
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register unsigned long __mask asm ("2") = mask;
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int cc;
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asm volatile(
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" siga 0\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc)
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: "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
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return cc;
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}
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/**
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* do_siga_output - perform SIGA-w/wt function
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* @schid: subchannel id or in case of QEBSM the subchannel token
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* @mask: which output queues to process
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* @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
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* @fc: function code to perform
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*
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* Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
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* Note: For IQDC unicast queues only the highest priority queue is processed.
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*/
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static inline int do_siga_output(unsigned long schid, unsigned long mask,
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unsigned int *bb, unsigned int fc)
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{
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register unsigned long __fc asm("0") = fc;
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register unsigned long __schid asm("1") = schid;
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register unsigned long __mask asm("2") = mask;
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int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
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asm volatile(
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" siga 0\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b, 1b)
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: "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
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: : "cc", "memory");
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*bb = ((unsigned int) __fc) >> 31;
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return cc;
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}
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static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
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{
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/* all done or next buffer state different */
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if (ccq == 0 || ccq == 32)
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return 0;
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/* not all buffers processed */
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if (ccq == 96 || ccq == 97)
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return 1;
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/* notify devices immediately */
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DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
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return -EIO;
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}
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/**
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* qdio_do_eqbs - extract buffer states for QEBSM
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* @q: queue to manipulate
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* @state: state of the extracted buffers
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* @start: buffer number to start at
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* @count: count of buffers to examine
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* @auto_ack: automatically acknowledge buffers
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*
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* Returns the number of successfully extracted equal buffer states.
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* Stops processing if a state is different from the last buffers state.
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*/
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static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
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int start, int count, int auto_ack)
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{
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unsigned int ccq = 0;
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int tmp_count = count, tmp_start = start;
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int nr = q->nr;
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int rc;
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BUG_ON(!q->irq_ptr->sch_token);
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qperf_inc(q, eqbs);
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if (!q->is_input_q)
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nr += q->irq_ptr->nr_input_qs;
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again:
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ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
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auto_ack);
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rc = qdio_check_ccq(q, ccq);
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/* At least one buffer was processed, return and extract the remaining
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* buffers later.
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*/
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if ((ccq == 96) && (count != tmp_count)) {
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qperf_inc(q, eqbs_partial);
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return (count - tmp_count);
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}
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if (rc == 1) {
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DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
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goto again;
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}
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if (rc < 0) {
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DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
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DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
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q->handler(q->irq_ptr->cdev,
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QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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0, -1, -1, q->irq_ptr->int_parm);
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return 0;
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}
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return count - tmp_count;
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}
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/**
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* qdio_do_sqbs - set buffer states for QEBSM
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* @q: queue to manipulate
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* @state: new state of the buffers
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* @start: first buffer number to change
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* @count: how many buffers to change
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*
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* Returns the number of successfully changed buffers.
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* Does retrying until the specified count of buffer states is set or an
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* error occurs.
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*/
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static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
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int count)
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{
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unsigned int ccq = 0;
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int tmp_count = count, tmp_start = start;
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int nr = q->nr;
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int rc;
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if (!count)
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return 0;
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BUG_ON(!q->irq_ptr->sch_token);
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qperf_inc(q, sqbs);
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if (!q->is_input_q)
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nr += q->irq_ptr->nr_input_qs;
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again:
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ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
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rc = qdio_check_ccq(q, ccq);
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if (rc == 1) {
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
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qperf_inc(q, sqbs_partial);
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goto again;
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}
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if (rc < 0) {
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DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
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DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
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q->handler(q->irq_ptr->cdev,
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QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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0, -1, -1, q->irq_ptr->int_parm);
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return 0;
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}
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WARN_ON(tmp_count);
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return count - tmp_count;
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}
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/* returns number of examined buffers and their common state in *state */
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static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
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unsigned char *state, unsigned int count,
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int auto_ack)
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{
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unsigned char __state = 0;
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int i;
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BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
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BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
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if (is_qebsm(q))
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return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
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for (i = 0; i < count; i++) {
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if (!__state)
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__state = q->slsb.val[bufnr];
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else if (q->slsb.val[bufnr] != __state)
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break;
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bufnr = next_buf(bufnr);
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}
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*state = __state;
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return i;
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}
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static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
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unsigned char *state, int auto_ack)
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{
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return get_buf_states(q, bufnr, state, 1, auto_ack);
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}
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/* wrap-around safe setting of slsb states, returns number of changed buffers */
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static inline int set_buf_states(struct qdio_q *q, int bufnr,
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unsigned char state, int count)
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{
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int i;
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BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
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BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
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if (is_qebsm(q))
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return qdio_do_sqbs(q, state, bufnr, count);
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for (i = 0; i < count; i++) {
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xchg(&q->slsb.val[bufnr], state);
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bufnr = next_buf(bufnr);
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}
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return count;
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}
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static inline int set_buf_state(struct qdio_q *q, int bufnr,
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unsigned char state)
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{
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return set_buf_states(q, bufnr, state, 1);
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}
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/* set slsb states to initial state */
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void qdio_init_buf_states(struct qdio_irq *irq_ptr)
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{
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struct qdio_q *q;
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int i;
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for_each_input_queue(irq_ptr, q, i)
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set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
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QDIO_MAX_BUFFERS_PER_Q);
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for_each_output_queue(irq_ptr, q, i)
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set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
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QDIO_MAX_BUFFERS_PER_Q);
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}
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static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
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unsigned int input)
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{
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int cc;
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if (!need_siga_sync(q))
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return 0;
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
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qperf_inc(q, siga_sync);
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cc = do_siga_sync(q->irq_ptr->schid, output, input);
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if (cc)
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DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
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return cc;
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}
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static inline int qdio_siga_sync_q(struct qdio_q *q)
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{
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if (q->is_input_q)
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return qdio_siga_sync(q, 0, q->mask);
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else
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return qdio_siga_sync(q, q->mask, 0);
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}
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static inline int qdio_siga_sync_out(struct qdio_q *q)
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{
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return qdio_siga_sync(q, ~0U, 0);
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}
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static inline int qdio_siga_sync_all(struct qdio_q *q)
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{
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return qdio_siga_sync(q, ~0U, ~0U);
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}
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static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
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{
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unsigned long schid;
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unsigned int fc = 0;
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u64 start_time = 0;
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int cc;
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if (q->u.out.use_enh_siga)
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fc = 3;
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if (is_qebsm(q)) {
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schid = q->irq_ptr->sch_token;
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fc |= 0x80;
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}
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else
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schid = *((u32 *)&q->irq_ptr->schid);
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again:
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cc = do_siga_output(schid, q->mask, busy_bit, fc);
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/* hipersocket busy condition */
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if (*busy_bit) {
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WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
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if (!start_time) {
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start_time = get_usecs();
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goto again;
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}
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if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
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goto again;
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}
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return cc;
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}
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static inline int qdio_siga_input(struct qdio_q *q)
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{
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int cc;
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
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qperf_inc(q, siga_read);
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cc = do_siga_input(q->irq_ptr->schid, q->mask);
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if (cc)
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DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
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return cc;
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}
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static inline void qdio_sync_after_thinint(struct qdio_q *q)
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{
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if (pci_out_supported(q)) {
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if (need_siga_sync_thinint(q))
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qdio_siga_sync_all(q);
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else if (need_siga_sync_out_thinint(q))
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qdio_siga_sync_out(q);
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} else
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qdio_siga_sync_q(q);
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}
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int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
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unsigned char *state)
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{
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qdio_siga_sync_q(q);
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return get_buf_states(q, bufnr, state, 1, 0);
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}
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static inline void qdio_stop_polling(struct qdio_q *q)
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{
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if (!q->u.in.polling)
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return;
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q->u.in.polling = 0;
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qperf_inc(q, stop_polling);
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/* show the card that we are not polling anymore */
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if (is_qebsm(q)) {
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set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
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q->u.in.ack_count);
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q->u.in.ack_count = 0;
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} else
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set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
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}
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static inline void account_sbals(struct qdio_q *q, int count)
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{
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int pos = 0;
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q->q_stats.nr_sbal_total += count;
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if (count == QDIO_MAX_BUFFERS_MASK) {
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q->q_stats.nr_sbals[7]++;
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return;
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}
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while (count >>= 1)
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pos++;
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q->q_stats.nr_sbals[pos]++;
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}
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static void announce_buffer_error(struct qdio_q *q, int count)
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{
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q->qdio_error |= QDIO_ERROR_SLSB_STATE;
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/* special handling for no target buffer empty */
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if ((!q->is_input_q &&
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(q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
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qperf_inc(q, target_full);
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
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q->first_to_check);
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return;
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}
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DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
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DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
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DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
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DBF_ERROR("F14:%2x F15:%2x",
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q->sbal[q->first_to_check]->element[14].flags & 0xff,
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q->sbal[q->first_to_check]->element[15].flags & 0xff);
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}
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static inline void inbound_primed(struct qdio_q *q, int count)
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{
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int new;
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
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/* for QEBSM the ACK was already set by EQBS */
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if (is_qebsm(q)) {
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if (!q->u.in.polling) {
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q->u.in.polling = 1;
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q->u.in.ack_count = count;
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q->u.in.ack_start = q->first_to_check;
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return;
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}
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/* delete the previous ACK's */
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set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
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q->u.in.ack_count);
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q->u.in.ack_count = count;
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q->u.in.ack_start = q->first_to_check;
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return;
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}
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/*
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* ACK the newest buffer. The ACK will be removed in qdio_stop_polling
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* or by the next inbound run.
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*/
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new = add_buf(q->first_to_check, count - 1);
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if (q->u.in.polling) {
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/* reset the previous ACK but first set the new one */
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set_buf_state(q, new, SLSB_P_INPUT_ACK);
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set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
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} else {
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q->u.in.polling = 1;
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set_buf_state(q, new, SLSB_P_INPUT_ACK);
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}
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q->u.in.ack_start = new;
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count--;
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if (!count)
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return;
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/* need to change ALL buffers to get more interrupts */
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set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
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}
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static int get_inbound_buffer_frontier(struct qdio_q *q)
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{
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int count, stop;
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unsigned char state;
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/*
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* Don't check 128 buffers, as otherwise qdio_inbound_q_moved
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* would return 0.
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*/
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count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
|
|
stop = add_buf(q->first_to_check, count);
|
|
|
|
if (q->first_to_check == stop)
|
|
goto out;
|
|
|
|
/*
|
|
* No siga sync here, as a PCI or we after a thin interrupt
|
|
* already sync'ed the queues.
|
|
*/
|
|
count = get_buf_states(q, q->first_to_check, &state, count, 1);
|
|
if (!count)
|
|
goto out;
|
|
|
|
switch (state) {
|
|
case SLSB_P_INPUT_PRIMED:
|
|
inbound_primed(q, count);
|
|
q->first_to_check = add_buf(q->first_to_check, count);
|
|
if (atomic_sub(count, &q->nr_buf_used) == 0)
|
|
qperf_inc(q, inbound_queue_full);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals(q, count);
|
|
break;
|
|
case SLSB_P_INPUT_ERROR:
|
|
announce_buffer_error(q, count);
|
|
/* process the buffer, the upper layer will take care of it */
|
|
q->first_to_check = add_buf(q->first_to_check, count);
|
|
atomic_sub(count, &q->nr_buf_used);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals_error(q, count);
|
|
break;
|
|
case SLSB_CU_INPUT_EMPTY:
|
|
case SLSB_P_INPUT_NOT_INIT:
|
|
case SLSB_P_INPUT_ACK:
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
q->q_stats.nr_sbal_nop++;
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
out:
|
|
return q->first_to_check;
|
|
}
|
|
|
|
static int qdio_inbound_q_moved(struct qdio_q *q)
|
|
{
|
|
int bufnr;
|
|
|
|
bufnr = get_inbound_buffer_frontier(q);
|
|
|
|
if ((bufnr != q->last_move) || q->qdio_error) {
|
|
q->last_move = bufnr;
|
|
if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
|
|
q->u.in.timestamp = get_usecs();
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
static inline int qdio_inbound_q_done(struct qdio_q *q)
|
|
{
|
|
unsigned char state = 0;
|
|
|
|
if (!atomic_read(&q->nr_buf_used))
|
|
return 1;
|
|
|
|
qdio_siga_sync_q(q);
|
|
get_buf_state(q, q->first_to_check, &state, 0);
|
|
|
|
if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
|
|
/* more work coming */
|
|
return 0;
|
|
|
|
if (is_thinint_irq(q->irq_ptr))
|
|
return 1;
|
|
|
|
/* don't poll under z/VM */
|
|
if (MACHINE_IS_VM)
|
|
return 1;
|
|
|
|
/*
|
|
* At this point we know, that inbound first_to_check
|
|
* has (probably) not moved (see qdio_inbound_processing).
|
|
*/
|
|
if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
|
|
q->first_to_check);
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
static void qdio_kick_handler(struct qdio_q *q)
|
|
{
|
|
int start = q->first_to_kick;
|
|
int end = q->first_to_check;
|
|
int count;
|
|
|
|
if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
|
|
return;
|
|
|
|
count = sub_buf(end, start);
|
|
|
|
if (q->is_input_q) {
|
|
qperf_inc(q, inbound_handler);
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
|
|
} else
|
|
qperf_inc(q, outbound_handler);
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
|
|
start, count);
|
|
|
|
q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
|
|
q->irq_ptr->int_parm);
|
|
|
|
/* for the next time */
|
|
q->first_to_kick = end;
|
|
q->qdio_error = 0;
|
|
}
|
|
|
|
static void __qdio_inbound_processing(struct qdio_q *q)
|
|
{
|
|
qperf_inc(q, tasklet_inbound);
|
|
again:
|
|
if (!qdio_inbound_q_moved(q))
|
|
return;
|
|
|
|
qdio_kick_handler(q);
|
|
|
|
if (!qdio_inbound_q_done(q)) {
|
|
/* means poll time is not yet over */
|
|
qperf_inc(q, tasklet_inbound_resched);
|
|
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)) {
|
|
qperf_inc(q, tasklet_inbound_resched2);
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
void qdio_inbound_processing(unsigned long data)
|
|
{
|
|
struct qdio_q *q = (struct qdio_q *)data;
|
|
__qdio_inbound_processing(q);
|
|
}
|
|
|
|
static int get_outbound_buffer_frontier(struct qdio_q *q)
|
|
{
|
|
int count, stop;
|
|
unsigned char state;
|
|
|
|
if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
|
|
(queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
|
|
qdio_siga_sync_q(q);
|
|
|
|
/*
|
|
* Don't check 128 buffers, as otherwise qdio_inbound_q_moved
|
|
* would return 0.
|
|
*/
|
|
count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
|
|
stop = add_buf(q->first_to_check, count);
|
|
|
|
if (q->first_to_check == stop)
|
|
return q->first_to_check;
|
|
|
|
count = get_buf_states(q, q->first_to_check, &state, count, 0);
|
|
if (!count)
|
|
return q->first_to_check;
|
|
|
|
switch (state) {
|
|
case SLSB_P_OUTPUT_EMPTY:
|
|
/* the adapter got it */
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
|
|
|
|
atomic_sub(count, &q->nr_buf_used);
|
|
q->first_to_check = add_buf(q->first_to_check, count);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals(q, count);
|
|
break;
|
|
case SLSB_P_OUTPUT_ERROR:
|
|
announce_buffer_error(q, count);
|
|
/* process the buffer, the upper layer will take care of it */
|
|
q->first_to_check = add_buf(q->first_to_check, count);
|
|
atomic_sub(count, &q->nr_buf_used);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals_error(q, count);
|
|
break;
|
|
case SLSB_CU_OUTPUT_PRIMED:
|
|
/* the adapter has not fetched the output yet */
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
q->q_stats.nr_sbal_nop++;
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
|
|
break;
|
|
case SLSB_P_OUTPUT_NOT_INIT:
|
|
case SLSB_P_OUTPUT_HALTED:
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
return q->first_to_check;
|
|
}
|
|
|
|
/* all buffers processed? */
|
|
static inline int qdio_outbound_q_done(struct qdio_q *q)
|
|
{
|
|
return atomic_read(&q->nr_buf_used) == 0;
|
|
}
|
|
|
|
static inline int qdio_outbound_q_moved(struct qdio_q *q)
|
|
{
|
|
int bufnr;
|
|
|
|
bufnr = get_outbound_buffer_frontier(q);
|
|
|
|
if ((bufnr != q->last_move) || q->qdio_error) {
|
|
q->last_move = bufnr;
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
static int qdio_kick_outbound_q(struct qdio_q *q)
|
|
{
|
|
unsigned int busy_bit;
|
|
int cc;
|
|
|
|
if (!need_siga_out(q))
|
|
return 0;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
|
|
qperf_inc(q, siga_write);
|
|
|
|
cc = qdio_siga_output(q, &busy_bit);
|
|
switch (cc) {
|
|
case 0:
|
|
break;
|
|
case 2:
|
|
if (busy_bit) {
|
|
DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
|
|
cc |= QDIO_ERROR_SIGA_BUSY;
|
|
} else
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
|
|
break;
|
|
case 1:
|
|
case 3:
|
|
DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
|
|
break;
|
|
}
|
|
return cc;
|
|
}
|
|
|
|
static void __qdio_outbound_processing(struct qdio_q *q)
|
|
{
|
|
qperf_inc(q, tasklet_outbound);
|
|
BUG_ON(atomic_read(&q->nr_buf_used) < 0);
|
|
|
|
if (qdio_outbound_q_moved(q))
|
|
qdio_kick_handler(q);
|
|
|
|
if (queue_type(q) == QDIO_ZFCP_QFMT)
|
|
if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
|
|
goto sched;
|
|
|
|
/* bail out for HiperSockets unicast queues */
|
|
if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
|
|
return;
|
|
|
|
if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
|
|
(atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
|
|
goto sched;
|
|
|
|
if (q->u.out.pci_out_enabled)
|
|
return;
|
|
|
|
/*
|
|
* Now we know that queue type is either qeth without pci enabled
|
|
* or HiperSockets multicast. Make sure buffer switch from PRIMED to
|
|
* EMPTY is noticed and outbound_handler is called after some time.
|
|
*/
|
|
if (qdio_outbound_q_done(q))
|
|
del_timer(&q->u.out.timer);
|
|
else
|
|
if (!timer_pending(&q->u.out.timer))
|
|
mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
|
|
return;
|
|
|
|
sched:
|
|
if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
|
|
return;
|
|
tasklet_schedule(&q->tasklet);
|
|
}
|
|
|
|
/* outbound tasklet */
|
|
void qdio_outbound_processing(unsigned long data)
|
|
{
|
|
struct qdio_q *q = (struct qdio_q *)data;
|
|
__qdio_outbound_processing(q);
|
|
}
|
|
|
|
void qdio_outbound_timer(unsigned long data)
|
|
{
|
|
struct qdio_q *q = (struct qdio_q *)data;
|
|
|
|
if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
|
|
return;
|
|
tasklet_schedule(&q->tasklet);
|
|
}
|
|
|
|
static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
|
|
{
|
|
struct qdio_q *out;
|
|
int i;
|
|
|
|
if (!pci_out_supported(q))
|
|
return;
|
|
|
|
for_each_output_queue(q->irq_ptr, out, i)
|
|
if (!qdio_outbound_q_done(out))
|
|
tasklet_schedule(&out->tasklet);
|
|
}
|
|
|
|
static void __tiqdio_inbound_processing(struct qdio_q *q)
|
|
{
|
|
qperf_inc(q, tasklet_inbound);
|
|
qdio_sync_after_thinint(q);
|
|
|
|
/*
|
|
* The interrupt could be caused by a PCI request. Check the
|
|
* PCI capable outbound queues.
|
|
*/
|
|
qdio_check_outbound_after_thinint(q);
|
|
|
|
if (!qdio_inbound_q_moved(q))
|
|
return;
|
|
|
|
qdio_kick_handler(q);
|
|
|
|
if (!qdio_inbound_q_done(q)) {
|
|
qperf_inc(q, tasklet_inbound_resched);
|
|
if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
|
|
tasklet_schedule(&q->tasklet);
|
|
return;
|
|
}
|
|
}
|
|
|
|
qdio_stop_polling(q);
|
|
/*
|
|
* We need to check again to not lose initiative after
|
|
* resetting the ACK state.
|
|
*/
|
|
if (!qdio_inbound_q_done(q)) {
|
|
qperf_inc(q, tasklet_inbound_resched2);
|
|
if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
|
|
tasklet_schedule(&q->tasklet);
|
|
}
|
|
}
|
|
|
|
void tiqdio_inbound_processing(unsigned long data)
|
|
{
|
|
struct qdio_q *q = (struct qdio_q *)data;
|
|
__tiqdio_inbound_processing(q);
|
|
}
|
|
|
|
static inline void qdio_set_state(struct qdio_irq *irq_ptr,
|
|
enum qdio_irq_states state)
|
|
{
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
|
|
|
|
irq_ptr->state = state;
|
|
mb();
|
|
}
|
|
|
|
static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
|
|
{
|
|
if (irb->esw.esw0.erw.cons) {
|
|
DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
|
|
DBF_ERROR_HEX(irb, 64);
|
|
DBF_ERROR_HEX(irb->ecw, 64);
|
|
}
|
|
}
|
|
|
|
/* PCI interrupt handler */
|
|
static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
|
|
{
|
|
int i;
|
|
struct qdio_q *q;
|
|
|
|
if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
|
|
return;
|
|
|
|
for_each_input_queue(irq_ptr, q, i)
|
|
tasklet_schedule(&q->tasklet);
|
|
|
|
if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
|
|
return;
|
|
|
|
for_each_output_queue(irq_ptr, q, i) {
|
|
if (qdio_outbound_q_done(q))
|
|
continue;
|
|
|
|
if (!siga_syncs_out_pci(q))
|
|
qdio_siga_sync_q(q);
|
|
|
|
tasklet_schedule(&q->tasklet);
|
|
}
|
|
}
|
|
|
|
static void qdio_handle_activate_check(struct ccw_device *cdev,
|
|
unsigned long intparm, int cstat, int dstat)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct qdio_q *q;
|
|
|
|
DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("intp :%lx", intparm);
|
|
DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
|
|
|
|
if (irq_ptr->nr_input_qs) {
|
|
q = irq_ptr->input_qs[0];
|
|
} else if (irq_ptr->nr_output_qs) {
|
|
q = irq_ptr->output_qs[0];
|
|
} else {
|
|
dump_stack();
|
|
goto no_handler;
|
|
}
|
|
q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
|
|
0, -1, -1, irq_ptr->int_parm);
|
|
no_handler:
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
|
|
}
|
|
|
|
static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
|
|
int dstat)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
|
|
|
|
if (cstat)
|
|
goto error;
|
|
if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
|
|
goto error;
|
|
if (!(dstat & DEV_STAT_DEV_END))
|
|
goto error;
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
|
|
return;
|
|
|
|
error:
|
|
DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
|
|
}
|
|
|
|
/* qdio interrupt handler */
|
|
void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
|
|
struct irb *irb)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
int cstat, dstat;
|
|
|
|
if (!intparm || !irq_ptr) {
|
|
DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
|
|
return;
|
|
}
|
|
|
|
if (IS_ERR(irb)) {
|
|
switch (PTR_ERR(irb)) {
|
|
case -EIO:
|
|
DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
|
|
wake_up(&cdev->private->wait_q);
|
|
return;
|
|
default:
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
}
|
|
qdio_irq_check_sense(irq_ptr, irb);
|
|
cstat = irb->scsw.cmd.cstat;
|
|
dstat = irb->scsw.cmd.dstat;
|
|
|
|
switch (irq_ptr->state) {
|
|
case QDIO_IRQ_STATE_INACTIVE:
|
|
qdio_establish_handle_irq(cdev, cstat, dstat);
|
|
break;
|
|
case QDIO_IRQ_STATE_CLEANUP:
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
break;
|
|
case QDIO_IRQ_STATE_ESTABLISHED:
|
|
case QDIO_IRQ_STATE_ACTIVE:
|
|
if (cstat & SCHN_STAT_PCI) {
|
|
qdio_int_handler_pci(irq_ptr);
|
|
return;
|
|
}
|
|
if (cstat || dstat)
|
|
qdio_handle_activate_check(cdev, intparm, cstat,
|
|
dstat);
|
|
break;
|
|
case QDIO_IRQ_STATE_STOPPED:
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
wake_up(&cdev->private->wait_q);
|
|
}
|
|
|
|
/**
|
|
* qdio_get_ssqd_desc - get qdio subchannel description
|
|
* @cdev: ccw device to get description for
|
|
* @data: where to store the ssqd
|
|
*
|
|
* Returns 0 or an error code. The results of the chsc are stored in the
|
|
* specified structure.
|
|
*/
|
|
int qdio_get_ssqd_desc(struct ccw_device *cdev,
|
|
struct qdio_ssqd_desc *data)
|
|
{
|
|
|
|
if (!cdev || !cdev->private)
|
|
return -EINVAL;
|
|
|
|
DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
|
|
return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
|
|
|
|
/**
|
|
* qdio_cleanup - shutdown queues and free data structures
|
|
* @cdev: associated ccw device
|
|
* @how: use halt or clear to shutdown
|
|
*
|
|
* This function calls qdio_shutdown() for @cdev with method @how.
|
|
* and qdio_free(). The qdio_free() return value is ignored since
|
|
* !irq_ptr is already checked.
|
|
*/
|
|
int qdio_cleanup(struct ccw_device *cdev, int how)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
int rc;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
rc = qdio_shutdown(cdev, how);
|
|
|
|
qdio_free(cdev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_cleanup);
|
|
|
|
static void qdio_shutdown_queues(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct qdio_q *q;
|
|
int i;
|
|
|
|
for_each_input_queue(irq_ptr, q, i)
|
|
tasklet_kill(&q->tasklet);
|
|
|
|
for_each_output_queue(irq_ptr, q, i) {
|
|
del_timer(&q->u.out.timer);
|
|
tasklet_kill(&q->tasklet);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdio_shutdown - shut down a qdio subchannel
|
|
* @cdev: associated ccw device
|
|
* @how: use halt or clear to shutdown
|
|
*/
|
|
int qdio_shutdown(struct ccw_device *cdev, int how)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
int rc;
|
|
unsigned long flags;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
BUG_ON(irqs_disabled());
|
|
DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
/*
|
|
* Subchannel was already shot down. We cannot prevent being called
|
|
* twice since cio may trigger a shutdown asynchronously.
|
|
*/
|
|
if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Indicate that the device is going down. Scheduling the queue
|
|
* tasklets is forbidden from here on.
|
|
*/
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
|
|
|
|
tiqdio_remove_input_queues(irq_ptr);
|
|
qdio_shutdown_queues(cdev);
|
|
qdio_shutdown_debug_entries(irq_ptr, cdev);
|
|
|
|
/* cleanup subchannel */
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
|
|
if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
|
|
rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
|
|
else
|
|
/* default behaviour is halt */
|
|
rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
|
|
if (rc) {
|
|
DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("rc:%4d", rc);
|
|
goto no_cleanup;
|
|
}
|
|
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
wait_event_interruptible_timeout(cdev->private->wait_q,
|
|
irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
|
|
irq_ptr->state == QDIO_IRQ_STATE_ERR,
|
|
10 * HZ);
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
|
|
no_cleanup:
|
|
qdio_shutdown_thinint(irq_ptr);
|
|
|
|
/* restore interrupt handler */
|
|
if ((void *)cdev->handler == (void *)qdio_int_handler)
|
|
cdev->handler = irq_ptr->orig_handler;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
if (rc)
|
|
return rc;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_shutdown);
|
|
|
|
/**
|
|
* qdio_free - free data structures for a qdio subchannel
|
|
* @cdev: associated ccw device
|
|
*/
|
|
int qdio_free(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
|
|
if (irq_ptr->debug_area != NULL) {
|
|
debug_unregister(irq_ptr->debug_area);
|
|
irq_ptr->debug_area = NULL;
|
|
}
|
|
cdev->private->qdio_data = NULL;
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
|
|
qdio_release_memory(irq_ptr);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_free);
|
|
|
|
/**
|
|
* qdio_initialize - allocate and establish queues for a qdio subchannel
|
|
* @init_data: initialization data
|
|
*
|
|
* This function first allocates queues via qdio_allocate() and on success
|
|
* establishes them via qdio_establish().
|
|
*/
|
|
int qdio_initialize(struct qdio_initialize *init_data)
|
|
{
|
|
int rc;
|
|
|
|
rc = qdio_allocate(init_data);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = qdio_establish(init_data);
|
|
if (rc)
|
|
qdio_free(init_data->cdev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_initialize);
|
|
|
|
/**
|
|
* qdio_allocate - allocate qdio queues and associated data
|
|
* @init_data: initialization data
|
|
*/
|
|
int qdio_allocate(struct qdio_initialize *init_data)
|
|
{
|
|
struct qdio_irq *irq_ptr;
|
|
|
|
DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
|
|
|
|
if ((init_data->no_input_qs && !init_data->input_handler) ||
|
|
(init_data->no_output_qs && !init_data->output_handler))
|
|
return -EINVAL;
|
|
|
|
if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
|
|
(init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
|
|
return -EINVAL;
|
|
|
|
if ((!init_data->input_sbal_addr_array) ||
|
|
(!init_data->output_sbal_addr_array))
|
|
return -EINVAL;
|
|
|
|
/* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
|
|
irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!irq_ptr)
|
|
goto out_err;
|
|
|
|
mutex_init(&irq_ptr->setup_mutex);
|
|
qdio_allocate_dbf(init_data, irq_ptr);
|
|
|
|
/*
|
|
* Allocate a page for the chsc calls in qdio_establish.
|
|
* Must be pre-allocated since a zfcp recovery will call
|
|
* qdio_establish. In case of low memory and swap on a zfcp disk
|
|
* we may not be able to allocate memory otherwise.
|
|
*/
|
|
irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
|
|
if (!irq_ptr->chsc_page)
|
|
goto out_rel;
|
|
|
|
/* qdr is used in ccw1.cda which is u32 */
|
|
irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!irq_ptr->qdr)
|
|
goto out_rel;
|
|
WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
|
|
|
|
if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
|
|
init_data->no_output_qs))
|
|
goto out_rel;
|
|
|
|
init_data->cdev->private->qdio_data = irq_ptr;
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
return 0;
|
|
out_rel:
|
|
qdio_release_memory(irq_ptr);
|
|
out_err:
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_allocate);
|
|
|
|
/**
|
|
* qdio_establish - establish queues on a qdio subchannel
|
|
* @init_data: initialization data
|
|
*/
|
|
int qdio_establish(struct qdio_initialize *init_data)
|
|
{
|
|
struct qdio_irq *irq_ptr;
|
|
struct ccw_device *cdev = init_data->cdev;
|
|
unsigned long saveflags;
|
|
int rc;
|
|
|
|
DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
|
|
|
|
irq_ptr = cdev->private->qdio_data;
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
if (cdev->private->state != DEV_STATE_ONLINE)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
qdio_setup_irq(init_data);
|
|
|
|
rc = qdio_establish_thinint(irq_ptr);
|
|
if (rc) {
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
return rc;
|
|
}
|
|
|
|
/* establish q */
|
|
irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
|
|
irq_ptr->ccw.flags = CCW_FLAG_SLI;
|
|
irq_ptr->ccw.count = irq_ptr->equeue.count;
|
|
irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
|
|
ccw_device_set_options_mask(cdev, 0);
|
|
|
|
rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
|
|
if (rc) {
|
|
DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("rc:%4x", rc);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
|
|
|
|
if (rc) {
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
return rc;
|
|
}
|
|
|
|
wait_event_interruptible_timeout(cdev->private->wait_q,
|
|
irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
|
|
irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
|
|
|
|
if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
return -EIO;
|
|
}
|
|
|
|
qdio_setup_ssqd_info(irq_ptr);
|
|
DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
|
|
DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
|
|
|
|
/* qebsm is now setup if available, initialize buffer states */
|
|
qdio_init_buf_states(irq_ptr);
|
|
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
qdio_print_subchannel_info(irq_ptr, cdev);
|
|
qdio_setup_debug_entries(irq_ptr, cdev);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_establish);
|
|
|
|
/**
|
|
* qdio_activate - activate queues on a qdio subchannel
|
|
* @cdev: associated cdev
|
|
*/
|
|
int qdio_activate(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_irq *irq_ptr;
|
|
int rc;
|
|
unsigned long saveflags;
|
|
|
|
DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
|
|
|
|
irq_ptr = cdev->private->qdio_data;
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
if (cdev->private->state != DEV_STATE_ONLINE)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
|
|
irq_ptr->ccw.flags = CCW_FLAG_SLI;
|
|
irq_ptr->ccw.count = irq_ptr->aqueue.count;
|
|
irq_ptr->ccw.cda = 0;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
|
|
ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
|
|
|
|
rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
|
|
0, DOIO_DENY_PREFETCH);
|
|
if (rc) {
|
|
DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("rc:%4x", rc);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
|
|
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (is_thinint_irq(irq_ptr))
|
|
tiqdio_add_input_queues(irq_ptr);
|
|
|
|
/* wait for subchannel to become active */
|
|
msleep(5);
|
|
|
|
switch (irq_ptr->state) {
|
|
case QDIO_IRQ_STATE_STOPPED:
|
|
case QDIO_IRQ_STATE_ERR:
|
|
rc = -EIO;
|
|
break;
|
|
default:
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
|
|
rc = 0;
|
|
}
|
|
out:
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_activate);
|
|
|
|
static inline int buf_in_between(int bufnr, int start, int count)
|
|
{
|
|
int end = add_buf(start, count);
|
|
|
|
if (end > start) {
|
|
if (bufnr >= start && bufnr < end)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* wrap-around case */
|
|
if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
|
|
(bufnr < end))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* handle_inbound - reset processed input buffers
|
|
* @q: queue containing the buffers
|
|
* @callflags: flags
|
|
* @bufnr: first buffer to process
|
|
* @count: how many buffers are emptied
|
|
*/
|
|
static int handle_inbound(struct qdio_q *q, unsigned int callflags,
|
|
int bufnr, int count)
|
|
{
|
|
int used, diff;
|
|
|
|
qperf_inc(q, inbound_call);
|
|
|
|
if (!q->u.in.polling)
|
|
goto set;
|
|
|
|
/* protect against stop polling setting an ACK for an emptied slsb */
|
|
if (count == QDIO_MAX_BUFFERS_PER_Q) {
|
|
/* overwriting everything, just delete polling status */
|
|
q->u.in.polling = 0;
|
|
q->u.in.ack_count = 0;
|
|
goto set;
|
|
} else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
|
|
if (is_qebsm(q)) {
|
|
/* partial overwrite, just update ack_start */
|
|
diff = add_buf(bufnr, count);
|
|
diff = sub_buf(diff, q->u.in.ack_start);
|
|
q->u.in.ack_count -= diff;
|
|
if (q->u.in.ack_count <= 0) {
|
|
q->u.in.polling = 0;
|
|
q->u.in.ack_count = 0;
|
|
goto set;
|
|
}
|
|
q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
|
|
}
|
|
else
|
|
/* the only ACK will be deleted, so stop polling */
|
|
q->u.in.polling = 0;
|
|
}
|
|
|
|
set:
|
|
count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
|
|
|
|
used = atomic_add_return(count, &q->nr_buf_used) - count;
|
|
BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
|
|
|
|
/* no need to signal as long as the adapter had free buffers */
|
|
if (used)
|
|
return 0;
|
|
|
|
if (need_siga_in(q))
|
|
return qdio_siga_input(q);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* handle_outbound - process filled outbound buffers
|
|
* @q: queue containing the buffers
|
|
* @callflags: flags
|
|
* @bufnr: first buffer to process
|
|
* @count: how many buffers are filled
|
|
*/
|
|
static int handle_outbound(struct qdio_q *q, unsigned int callflags,
|
|
int bufnr, int count)
|
|
{
|
|
unsigned char state;
|
|
int used, rc = 0;
|
|
|
|
qperf_inc(q, outbound_call);
|
|
|
|
count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
|
|
used = atomic_add_return(count, &q->nr_buf_used);
|
|
BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
|
|
|
|
if (callflags & QDIO_FLAG_PCI_OUT) {
|
|
q->u.out.pci_out_enabled = 1;
|
|
qperf_inc(q, pci_request_int);
|
|
}
|
|
else
|
|
q->u.out.pci_out_enabled = 0;
|
|
|
|
if (queue_type(q) == QDIO_IQDIO_QFMT) {
|
|
if (multicast_outbound(q))
|
|
rc = qdio_kick_outbound_q(q);
|
|
else
|
|
if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
|
|
(count > 1) &&
|
|
(count <= q->irq_ptr->ssqd_desc.mmwc)) {
|
|
/* exploit enhanced SIGA */
|
|
q->u.out.use_enh_siga = 1;
|
|
rc = qdio_kick_outbound_q(q);
|
|
} else {
|
|
/*
|
|
* One siga-w per buffer required for unicast
|
|
* HiperSockets.
|
|
*/
|
|
q->u.out.use_enh_siga = 0;
|
|
while (count--) {
|
|
rc = qdio_kick_outbound_q(q);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (need_siga_sync(q)) {
|
|
qdio_siga_sync_q(q);
|
|
goto out;
|
|
}
|
|
|
|
/* try to fast requeue buffers */
|
|
get_buf_state(q, prev_buf(bufnr), &state, 0);
|
|
if (state != SLSB_CU_OUTPUT_PRIMED)
|
|
rc = qdio_kick_outbound_q(q);
|
|
else
|
|
qperf_inc(q, fast_requeue);
|
|
|
|
out:
|
|
tasklet_schedule(&q->tasklet);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* do_QDIO - process input or output buffers
|
|
* @cdev: associated ccw_device for the qdio subchannel
|
|
* @callflags: input or output and special flags from the program
|
|
* @q_nr: queue number
|
|
* @bufnr: buffer number
|
|
* @count: how many buffers to process
|
|
*/
|
|
int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
|
|
int q_nr, unsigned int bufnr, unsigned int count)
|
|
{
|
|
struct qdio_irq *irq_ptr;
|
|
|
|
if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
|
|
return -EINVAL;
|
|
|
|
irq_ptr = cdev->private->qdio_data;
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr,
|
|
"do%02x b:%02x c:%02x", callflags, bufnr, count);
|
|
|
|
if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
|
|
return -EBUSY;
|
|
|
|
if (callflags & QDIO_FLAG_SYNC_INPUT)
|
|
return handle_inbound(irq_ptr->input_qs[q_nr],
|
|
callflags, bufnr, count);
|
|
else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
|
|
return handle_outbound(irq_ptr->output_qs[q_nr],
|
|
callflags, bufnr, count);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(do_QDIO);
|
|
|
|
static int __init init_QDIO(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = qdio_setup_init();
|
|
if (rc)
|
|
return rc;
|
|
rc = tiqdio_allocate_memory();
|
|
if (rc)
|
|
goto out_cache;
|
|
rc = qdio_debug_init();
|
|
if (rc)
|
|
goto out_ti;
|
|
rc = tiqdio_register_thinints();
|
|
if (rc)
|
|
goto out_debug;
|
|
return 0;
|
|
|
|
out_debug:
|
|
qdio_debug_exit();
|
|
out_ti:
|
|
tiqdio_free_memory();
|
|
out_cache:
|
|
qdio_setup_exit();
|
|
return rc;
|
|
}
|
|
|
|
static void __exit exit_QDIO(void)
|
|
{
|
|
tiqdio_unregister_thinints();
|
|
tiqdio_free_memory();
|
|
qdio_debug_exit();
|
|
qdio_setup_exit();
|
|
}
|
|
|
|
module_init(init_QDIO);
|
|
module_exit(exit_QDIO);
|