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e628f28793
All callers of set_buf_states() are already making sure that 'count' is not 0. So don't check it an additional time. Note that our own code also doesn't _require_ the count to be sane (ie. we can't overrun an array or similar). So worst case HW would simply reject the SQBS operation and report an error. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
1413 lines
34 KiB
C
1413 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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 IBM Corp. 2000, 2008
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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/kmemleak.h>
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#include <linux/delay.h>
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#include <linux/gfp.h>
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#include <linux/io.h>
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#include <linux/atomic.h>
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#include <asm/debug.h>
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#include <asm/qdio.h>
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#include <asm/ipl.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(unsigned long schid,
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unsigned long out_mask, unsigned long in_mask,
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unsigned int fc)
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{
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int cc;
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asm volatile(
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" lgr 0,%[fc]\n"
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" lgr 1,%[schid]\n"
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" lgr 2,%[out]\n"
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" lgr 3,%[in]\n"
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" siga 0\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=&d" (cc)
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: [fc] "d" (fc), [schid] "d" (schid),
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[out] "d" (out_mask), [in] "d" (in_mask)
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: "cc", "0", "1", "2", "3");
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return cc;
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}
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static inline int do_siga_input(unsigned long schid, unsigned long mask,
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unsigned long fc)
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{
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int cc;
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asm volatile(
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" lgr 0,%[fc]\n"
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" lgr 1,%[schid]\n"
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" lgr 2,%[mask]\n"
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" siga 0\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=&d" (cc)
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: [fc] "d" (fc), [schid] "d" (schid), [mask] "d" (mask)
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: "cc", "0", "1", "2");
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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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* @aob: asynchronous operation block
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*
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* Returns condition code.
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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 long fc,
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unsigned long aob)
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{
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int cc;
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asm volatile(
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" lgr 0,%[fc]\n"
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" lgr 1,%[schid]\n"
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" lgr 2,%[mask]\n"
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" lgr 3,%[aob]\n"
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" siga 0\n"
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" lgr %[fc],0\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=&d" (cc), [fc] "+&d" (fc)
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: [schid] "d" (schid), [mask] "d" (mask), [aob] "d" (aob)
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: "cc", "0", "1", "2", "3");
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*bb = fc >> 31;
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return cc;
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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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int tmp_count = count, tmp_start = start, nr = q->nr;
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unsigned int ccq = 0;
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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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switch (ccq) {
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case 0:
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case 32:
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/* all done, or next buffer state different */
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return count - tmp_count;
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case 96:
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/* not all buffers processed */
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qperf_inc(q, eqbs_partial);
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
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tmp_count);
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return count - tmp_count;
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case 97:
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/* no buffer processed */
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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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default:
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DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
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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, QDIO_ERROR_GET_BUF_STATE, q->nr,
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q->first_to_check, count, q->irq_ptr->int_parm);
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return 0;
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}
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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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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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switch (ccq) {
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case 0:
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case 32:
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/* all done, or active buffer adapter-owned */
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WARN_ON_ONCE(tmp_count);
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return count - tmp_count;
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case 96:
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/* not all buffers processed */
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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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default:
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DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
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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, QDIO_ERROR_SET_BUF_STATE, q->nr,
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q->first_to_check, count, q->irq_ptr->int_parm);
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return 0;
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}
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}
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/*
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* Returns number of examined buffers and their common state in *state.
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* Requested number of buffers-to-examine must be > 0.
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*/
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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 = 1;
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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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/* get initial state: */
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__state = q->slsb.val[bufnr];
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/* Bail out early if there is no work on the queue: */
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if (__state & SLSB_OWNER_CU)
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goto out;
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for (; i < count; i++) {
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bufnr = next_buf(bufnr);
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/* stop if next state differs from initial state: */
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if (q->slsb.val[bufnr] != __state)
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break;
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}
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out:
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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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if (is_qebsm(q))
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return qdio_do_sqbs(q, state, bufnr, count);
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/* Ensure that all preceding changes to the SBALs are visible: */
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mb();
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for (i = 0; i < count; i++) {
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WRITE_ONCE(q->slsb.val[bufnr], state);
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bufnr = next_buf(bufnr);
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}
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/* Make our SLSB changes visible: */
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mb();
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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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static 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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unsigned long schid = *((u32 *) &q->irq_ptr->schid);
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unsigned int fc = QDIO_SIGA_SYNC;
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int cc;
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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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if (is_qebsm(q)) {
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schid = q->irq_ptr->sch_token;
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fc |= QDIO_SIGA_QEBSM_FLAG;
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}
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cc = do_siga_sync(schid, output, input, fc);
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if (unlikely(cc))
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DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
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return (cc) ? -EIO : 0;
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}
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static inline int qdio_sync_input_queue(struct qdio_q *q)
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{
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return qdio_siga_sync(q, 0, q->mask);
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}
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static inline int qdio_sync_output_queue(struct qdio_q *q)
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{
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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_q(struct qdio_q *q)
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{
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if (q->is_input_q)
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return qdio_sync_input_queue(q);
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else
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return qdio_sync_output_queue(q);
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}
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static int qdio_siga_output(struct qdio_q *q, unsigned int count,
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unsigned int *busy_bit, unsigned long aob)
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{
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unsigned long schid = *((u32 *) &q->irq_ptr->schid);
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unsigned int fc = QDIO_SIGA_WRITE;
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u64 start_time = 0;
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int retries = 0, cc;
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if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
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if (count > 1)
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fc = QDIO_SIGA_WRITEM;
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else if (aob)
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fc = QDIO_SIGA_WRITEQ;
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}
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if (is_qebsm(q)) {
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schid = q->irq_ptr->sch_token;
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fc |= QDIO_SIGA_QEBSM_FLAG;
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}
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again:
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cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
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/* hipersocket busy condition */
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if (unlikely(*busy_bit)) {
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retries++;
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if (!start_time) {
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start_time = get_tod_clock_fast();
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goto again;
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}
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if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
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goto again;
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}
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if (retries) {
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DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
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"%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
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DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
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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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unsigned long schid = *((u32 *) &q->irq_ptr->schid);
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unsigned int fc = QDIO_SIGA_READ;
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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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if (is_qebsm(q)) {
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schid = q->irq_ptr->sch_token;
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fc |= QDIO_SIGA_QEBSM_FLAG;
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}
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cc = do_siga_input(schid, q->mask, fc);
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if (unlikely(cc))
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DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
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return (cc) ? -EIO : 0;
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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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if (qdio_need_siga_sync(q->irq_ptr))
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qdio_siga_sync_q(q);
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return get_buf_state(q, bufnr, state, 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.batch_count)
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return;
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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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set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
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q->u.in.batch_count);
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q->u.in.batch_count = 0;
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}
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static inline void account_sbals(struct qdio_q *q, unsigned int count)
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{
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q->q_stats.nr_sbal_total += count;
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q->q_stats.nr_sbals[ilog2(count)]++;
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}
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static void process_buffer_error(struct qdio_q *q, unsigned int start,
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int count)
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{
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/* special handling for no target buffer empty */
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if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
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q->sbal[start]->element[15].sflags == 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", start);
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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", start, count);
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DBF_ERROR("F14:%2x F15:%2x",
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q->sbal[start]->element[14].sflags,
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q->sbal[start]->element[15].sflags);
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}
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static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
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int count, bool auto_ack)
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{
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/* ACK the newest SBAL: */
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if (!auto_ack)
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set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
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|
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if (!q->u.in.batch_count)
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q->u.in.batch_start = start;
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q->u.in.batch_count += count;
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}
|
|
|
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static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
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unsigned int *error)
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{
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unsigned char state = 0;
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int count;
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|
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q->timestamp = get_tod_clock_fast();
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|
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count = atomic_read(&q->nr_buf_used);
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if (!count)
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return 0;
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|
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if (qdio_need_siga_sync(q->irq_ptr))
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qdio_sync_input_queue(q);
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count = get_buf_states(q, start, &state, count, 1);
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if (!count)
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return 0;
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|
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switch (state) {
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case SLSB_P_INPUT_PRIMED:
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
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count);
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|
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inbound_handle_work(q, start, count, is_qebsm(q));
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if (atomic_sub_return(count, &q->nr_buf_used) == 0)
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qperf_inc(q, inbound_queue_full);
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if (q->irq_ptr->perf_stat_enabled)
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account_sbals(q, count);
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return count;
|
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case SLSB_P_INPUT_ERROR:
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
|
|
count);
|
|
|
|
*error = QDIO_ERROR_SLSB_STATE;
|
|
process_buffer_error(q, start, count);
|
|
inbound_handle_work(q, start, count, false);
|
|
if (atomic_sub_return(count, &q->nr_buf_used) == 0)
|
|
qperf_inc(q, inbound_queue_full);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals_error(q, count);
|
|
return count;
|
|
case SLSB_CU_INPUT_EMPTY:
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
q->q_stats.nr_sbal_nop++;
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
|
|
q->nr, start);
|
|
return 0;
|
|
case SLSB_P_INPUT_NOT_INIT:
|
|
case SLSB_P_INPUT_ACK:
|
|
/* We should never see this state, throw a WARN: */
|
|
default:
|
|
dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
|
|
"found state %#x at index %u on queue %u\n",
|
|
state, start, q->nr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
|
|
unsigned int *bufnr, unsigned int *error)
|
|
{
|
|
struct qdio_irq *irq = cdev->private->qdio_data;
|
|
unsigned int start;
|
|
struct qdio_q *q;
|
|
int count;
|
|
|
|
if (!irq)
|
|
return -ENODEV;
|
|
|
|
q = irq->input_qs[nr];
|
|
start = q->first_to_check;
|
|
*error = 0;
|
|
|
|
count = get_inbound_buffer_frontier(q, start, error);
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
*bufnr = start;
|
|
q->first_to_check = add_buf(start, count);
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_inspect_input_queue);
|
|
|
|
static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
|
|
{
|
|
unsigned char state = 0;
|
|
|
|
if (!atomic_read(&q->nr_buf_used))
|
|
return 1;
|
|
|
|
if (qdio_need_siga_sync(q->irq_ptr))
|
|
qdio_sync_input_queue(q);
|
|
get_buf_state(q, start, &state, 0);
|
|
|
|
if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
|
|
/* more work coming */
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
|
|
unsigned int *error)
|
|
{
|
|
unsigned char state = 0;
|
|
int count;
|
|
|
|
q->timestamp = get_tod_clock_fast();
|
|
|
|
count = atomic_read(&q->nr_buf_used);
|
|
if (!count)
|
|
return 0;
|
|
|
|
if (qdio_need_siga_sync(q->irq_ptr))
|
|
qdio_sync_output_queue(q);
|
|
|
|
count = get_buf_states(q, start, &state, count, 0);
|
|
if (!count)
|
|
return 0;
|
|
|
|
switch (state) {
|
|
case SLSB_P_OUTPUT_PENDING:
|
|
*error = QDIO_ERROR_SLSB_PENDING;
|
|
fallthrough;
|
|
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);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals(q, count);
|
|
return count;
|
|
case SLSB_P_OUTPUT_ERROR:
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out error:%1d %02x",
|
|
q->nr, count);
|
|
|
|
*error = QDIO_ERROR_SLSB_STATE;
|
|
process_buffer_error(q, start, count);
|
|
atomic_sub(count, &q->nr_buf_used);
|
|
if (q->irq_ptr->perf_stat_enabled)
|
|
account_sbals_error(q, count);
|
|
return count;
|
|
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);
|
|
return 0;
|
|
case SLSB_P_OUTPUT_HALTED:
|
|
return 0;
|
|
case SLSB_P_OUTPUT_NOT_INIT:
|
|
/* We should never see this state, throw a WARN: */
|
|
default:
|
|
dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
|
|
"found state %#x at index %u on queue %u\n",
|
|
state, start, q->nr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
|
|
unsigned int *bufnr, unsigned int *error)
|
|
{
|
|
struct qdio_irq *irq = cdev->private->qdio_data;
|
|
unsigned int start;
|
|
struct qdio_q *q;
|
|
int count;
|
|
|
|
if (!irq)
|
|
return -ENODEV;
|
|
|
|
q = irq->output_qs[nr];
|
|
start = q->first_to_check;
|
|
*error = 0;
|
|
|
|
count = get_outbound_buffer_frontier(q, start, error);
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
*bufnr = start;
|
|
q->first_to_check = add_buf(start, count);
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_inspect_output_queue);
|
|
|
|
static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
|
|
unsigned long aob)
|
|
{
|
|
int retries = 0, cc;
|
|
unsigned int busy_bit;
|
|
|
|
if (!qdio_need_siga_out(q->irq_ptr))
|
|
return 0;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
|
|
retry:
|
|
qperf_inc(q, siga_write);
|
|
|
|
cc = qdio_siga_output(q, count, &busy_bit, aob);
|
|
switch (cc) {
|
|
case 0:
|
|
break;
|
|
case 2:
|
|
if (busy_bit) {
|
|
while (++retries < QDIO_BUSY_BIT_RETRIES) {
|
|
mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
|
|
goto retry;
|
|
}
|
|
DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
|
|
cc = -EBUSY;
|
|
} else {
|
|
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
|
|
cc = -ENOBUFS;
|
|
}
|
|
break;
|
|
case 1:
|
|
case 3:
|
|
DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
|
|
cc = -EIO;
|
|
break;
|
|
}
|
|
if (retries) {
|
|
DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
|
|
DBF_ERROR("count:%u", retries);
|
|
}
|
|
return cc;
|
|
}
|
|
|
|
static 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)
|
|
{
|
|
if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
|
|
return;
|
|
|
|
qdio_deliver_irq(irq_ptr);
|
|
irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
|
|
}
|
|
|
|
static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
|
|
unsigned long intparm, int cstat,
|
|
int dstat)
|
|
{
|
|
unsigned int first_to_check = 0;
|
|
|
|
DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("intp :%lx", intparm);
|
|
DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
|
|
|
|
/* zfcp wants this: */
|
|
if (irq_ptr->nr_input_qs)
|
|
first_to_check = irq_ptr->input_qs[0]->first_to_check;
|
|
|
|
irq_ptr->error_handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0,
|
|
first_to_check, 0, irq_ptr->int_parm);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
|
|
/*
|
|
* In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
|
|
* Therefore we call the LGR detection function here.
|
|
*/
|
|
lgr_info_log();
|
|
}
|
|
|
|
static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
|
|
int dstat)
|
|
{
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
|
|
|
|
if (cstat)
|
|
goto error;
|
|
if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
|
|
goto error;
|
|
if (!(dstat & DEV_STAT_DEV_END))
|
|
goto error;
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
|
|
return;
|
|
|
|
error:
|
|
DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
|
|
}
|
|
|
|
/* qdio interrupt handler */
|
|
void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
|
|
struct irb *irb)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct subchannel_id schid;
|
|
int cstat, dstat;
|
|
|
|
if (!intparm || !irq_ptr) {
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_ERROR("qint:%4x", schid.sch_no);
|
|
return;
|
|
}
|
|
|
|
if (irq_ptr->perf_stat_enabled)
|
|
irq_ptr->perf_stat.qdio_int++;
|
|
|
|
if (IS_ERR(irb)) {
|
|
DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
|
|
wake_up(&cdev->private->wait_q);
|
|
return;
|
|
}
|
|
qdio_irq_check_sense(irq_ptr, irb);
|
|
cstat = irb->scsw.cmd.cstat;
|
|
dstat = irb->scsw.cmd.dstat;
|
|
|
|
switch (irq_ptr->state) {
|
|
case QDIO_IRQ_STATE_INACTIVE:
|
|
qdio_establish_handle_irq(irq_ptr, 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(irq_ptr, intparm, cstat,
|
|
dstat);
|
|
break;
|
|
case QDIO_IRQ_STATE_STOPPED:
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
wake_up(&cdev->private->wait_q);
|
|
}
|
|
|
|
/**
|
|
* qdio_get_ssqd_desc - get qdio subchannel description
|
|
* @cdev: ccw device to get description for
|
|
* @data: where to store the ssqd
|
|
*
|
|
* Returns 0 or an error code. The results of the chsc are stored in the
|
|
* specified structure.
|
|
*/
|
|
int qdio_get_ssqd_desc(struct ccw_device *cdev,
|
|
struct qdio_ssqd_desc *data)
|
|
{
|
|
struct subchannel_id schid;
|
|
|
|
if (!cdev || !cdev->private)
|
|
return -EINVAL;
|
|
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("get ssqd:%4x", schid.sch_no);
|
|
return qdio_setup_get_ssqd(NULL, &schid, data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
|
|
|
|
static int qdio_cancel_ccw(struct qdio_irq *irq, int how)
|
|
{
|
|
struct ccw_device *cdev = irq->cdev;
|
|
long timeout;
|
|
int rc;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
|
qdio_set_state(irq, QDIO_IRQ_STATE_CLEANUP);
|
|
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);
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
if (rc) {
|
|
DBF_ERROR("%4x SHUTD ERR", irq->schid.sch_no);
|
|
DBF_ERROR("rc:%4d", rc);
|
|
return rc;
|
|
}
|
|
|
|
timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
|
|
irq->state == QDIO_IRQ_STATE_INACTIVE ||
|
|
irq->state == QDIO_IRQ_STATE_ERR,
|
|
10 * HZ);
|
|
if (timeout <= 0)
|
|
rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* qdio_shutdown - shut down a qdio subchannel
|
|
* @cdev: associated ccw device
|
|
* @how: use halt or clear to shutdown
|
|
*/
|
|
int qdio_shutdown(struct ccw_device *cdev, int how)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct subchannel_id schid;
|
|
int rc;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
WARN_ON_ONCE(irqs_disabled());
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("qshutdown:%4x", schid.sch_no);
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
/*
|
|
* Subchannel was already shot down. We cannot prevent being called
|
|
* twice since cio may trigger a shutdown asynchronously.
|
|
*/
|
|
if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Indicate that the device is going down.
|
|
*/
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
|
|
|
|
qdio_shutdown_debug_entries(irq_ptr);
|
|
|
|
rc = qdio_cancel_ccw(irq_ptr, how);
|
|
qdio_shutdown_thinint(irq_ptr);
|
|
qdio_shutdown_irq(irq_ptr);
|
|
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
if (rc)
|
|
return rc;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_shutdown);
|
|
|
|
/**
|
|
* qdio_free - free data structures for a qdio subchannel
|
|
* @cdev: associated ccw device
|
|
*/
|
|
int qdio_free(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct subchannel_id schid;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("qfree:%4x", schid.sch_no);
|
|
DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
|
|
irq_ptr->debug_area = NULL;
|
|
cdev->private->qdio_data = NULL;
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
|
|
qdio_free_queues(irq_ptr);
|
|
free_page((unsigned long) irq_ptr->qdr);
|
|
free_page(irq_ptr->chsc_page);
|
|
kfree(irq_ptr->ccw);
|
|
free_page((unsigned long) irq_ptr);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_free);
|
|
|
|
/**
|
|
* qdio_allocate - allocate qdio queues and associated data
|
|
* @cdev: associated ccw device
|
|
* @no_input_qs: allocate this number of Input Queues
|
|
* @no_output_qs: allocate this number of Output Queues
|
|
*/
|
|
int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
|
|
unsigned int no_output_qs)
|
|
{
|
|
struct subchannel_id schid;
|
|
struct qdio_irq *irq_ptr;
|
|
int rc = -ENOMEM;
|
|
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("qallocate:%4x", schid.sch_no);
|
|
|
|
if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
|
|
no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
|
|
return -EINVAL;
|
|
|
|
irq_ptr = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!irq_ptr)
|
|
return -ENOMEM;
|
|
|
|
irq_ptr->ccw = kmalloc(sizeof(*irq_ptr->ccw), GFP_KERNEL | GFP_DMA);
|
|
if (!irq_ptr->ccw)
|
|
goto err_ccw;
|
|
|
|
/* kmemleak doesn't scan the page-allocated irq_ptr: */
|
|
kmemleak_not_leak(irq_ptr->ccw);
|
|
|
|
irq_ptr->cdev = cdev;
|
|
mutex_init(&irq_ptr->setup_mutex);
|
|
if (qdio_allocate_dbf(irq_ptr))
|
|
goto err_dbf;
|
|
|
|
DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
|
|
no_output_qs);
|
|
|
|
/*
|
|
* 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 err_chsc;
|
|
|
|
/* 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 err_qdr;
|
|
|
|
rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
|
|
if (rc)
|
|
goto err_queues;
|
|
|
|
cdev->private->qdio_data = irq_ptr;
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
return 0;
|
|
|
|
err_queues:
|
|
free_page((unsigned long) irq_ptr->qdr);
|
|
err_qdr:
|
|
free_page(irq_ptr->chsc_page);
|
|
err_chsc:
|
|
err_dbf:
|
|
kfree(irq_ptr->ccw);
|
|
err_ccw:
|
|
free_page((unsigned long) irq_ptr);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_allocate);
|
|
|
|
static void qdio_trace_init_data(struct qdio_irq *irq,
|
|
struct qdio_initialize *data)
|
|
{
|
|
DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
|
|
DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
|
|
DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
|
|
DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
|
|
data->no_output_qs);
|
|
DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
|
|
DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
|
|
DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
|
|
DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
|
|
DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
|
|
DBF_ERR);
|
|
}
|
|
|
|
/**
|
|
* qdio_establish - establish queues on a qdio subchannel
|
|
* @cdev: associated ccw device
|
|
* @init_data: initialization data
|
|
*/
|
|
int qdio_establish(struct ccw_device *cdev,
|
|
struct qdio_initialize *init_data)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
struct subchannel_id schid;
|
|
struct ciw *ciw;
|
|
long timeout;
|
|
int rc;
|
|
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("qestablish:%4x", schid.sch_no);
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
if (init_data->no_input_qs > irq_ptr->max_input_qs ||
|
|
init_data->no_output_qs > irq_ptr->max_output_qs)
|
|
return -EINVAL;
|
|
|
|
/* Needed as error_handler: */
|
|
if (!init_data->input_handler)
|
|
return -EINVAL;
|
|
|
|
if (init_data->no_output_qs && !init_data->output_handler)
|
|
return -EINVAL;
|
|
|
|
if (!init_data->input_sbal_addr_array ||
|
|
!init_data->output_sbal_addr_array)
|
|
return -EINVAL;
|
|
|
|
if (!init_data->irq_poll)
|
|
return -EINVAL;
|
|
|
|
ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
|
|
if (!ciw) {
|
|
DBF_ERROR("%4x NO EQ", schid.sch_no);
|
|
return -EIO;
|
|
}
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
qdio_trace_init_data(irq_ptr, init_data);
|
|
qdio_setup_irq(irq_ptr, init_data);
|
|
|
|
rc = qdio_establish_thinint(irq_ptr);
|
|
if (rc)
|
|
goto err_thinint;
|
|
|
|
/* establish q */
|
|
irq_ptr->ccw->cmd_code = ciw->cmd;
|
|
irq_ptr->ccw->flags = CCW_FLAG_SLI;
|
|
irq_ptr->ccw->count = ciw->count;
|
|
irq_ptr->ccw->cda = (u32) virt_to_phys(irq_ptr->qdr);
|
|
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
|
ccw_device_set_options_mask(cdev, 0);
|
|
|
|
rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
if (rc) {
|
|
DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("rc:%4x", rc);
|
|
goto err_ccw_start;
|
|
}
|
|
|
|
timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
|
|
irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
|
|
irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
|
|
if (timeout <= 0) {
|
|
rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
|
|
goto err_ccw_timeout;
|
|
}
|
|
|
|
if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
|
|
rc = -EIO;
|
|
goto err_ccw_error;
|
|
}
|
|
|
|
qdio_setup_ssqd_info(irq_ptr);
|
|
|
|
/* qebsm is now setup if available, initialize buffer states */
|
|
qdio_init_buf_states(irq_ptr);
|
|
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
qdio_print_subchannel_info(irq_ptr);
|
|
qdio_setup_debug_entries(irq_ptr);
|
|
return 0;
|
|
|
|
err_ccw_timeout:
|
|
qdio_cancel_ccw(irq_ptr, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
err_ccw_error:
|
|
err_ccw_start:
|
|
qdio_shutdown_thinint(irq_ptr);
|
|
err_thinint:
|
|
qdio_shutdown_irq(irq_ptr);
|
|
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
|
|
mutex_unlock(&irq_ptr->setup_mutex);
|
|
return rc;
|
|
}
|
|
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 = cdev->private->qdio_data;
|
|
struct subchannel_id schid;
|
|
struct ciw *ciw;
|
|
int rc;
|
|
|
|
ccw_device_get_schid(cdev, &schid);
|
|
DBF_EVENT("qactivate:%4x", schid.sch_no);
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
|
|
if (!ciw) {
|
|
DBF_ERROR("%4x NO AQ", schid.sch_no);
|
|
return -EIO;
|
|
}
|
|
|
|
mutex_lock(&irq_ptr->setup_mutex);
|
|
if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
irq_ptr->ccw->cmd_code = ciw->cmd;
|
|
irq_ptr->ccw->flags = CCW_FLAG_SLI;
|
|
irq_ptr->ccw->count = ciw->count;
|
|
irq_ptr->ccw->cda = 0;
|
|
|
|
spin_lock_irq(get_ccwdev_lock(cdev));
|
|
ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
|
|
|
|
rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ACTIVATE,
|
|
0, DOIO_DENY_PREFETCH);
|
|
spin_unlock_irq(get_ccwdev_lock(cdev));
|
|
if (rc) {
|
|
DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
|
|
DBF_ERROR("rc:%4x", rc);
|
|
goto out;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/**
|
|
* handle_inbound - reset processed input buffers
|
|
* @q: queue containing the buffers
|
|
* @bufnr: first buffer to process
|
|
* @count: how many buffers are emptied
|
|
*/
|
|
static int handle_inbound(struct qdio_q *q, int bufnr, int count)
|
|
{
|
|
int overlap;
|
|
|
|
qperf_inc(q, inbound_call);
|
|
|
|
/* If any processed SBALs are returned to HW, adjust our tracking: */
|
|
overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
|
|
q->u.in.batch_count);
|
|
if (overlap > 0) {
|
|
q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
|
|
q->u.in.batch_count -= overlap;
|
|
}
|
|
|
|
count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
|
|
atomic_add(count, &q->nr_buf_used);
|
|
|
|
if (qdio_need_siga_in(q->irq_ptr))
|
|
return qdio_siga_input(q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* qdio_add_bufs_to_input_queue - process buffers on an Input Queue
|
|
* @cdev: associated ccw_device for the qdio subchannel
|
|
* @q_nr: queue number
|
|
* @bufnr: buffer number
|
|
* @count: how many buffers to process
|
|
*/
|
|
int qdio_add_bufs_to_input_queue(struct ccw_device *cdev, unsigned int q_nr,
|
|
unsigned int bufnr, unsigned int count)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
|
|
if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
|
|
return -EINVAL;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addi b:%02x c:%02x", bufnr, count);
|
|
|
|
if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
|
|
return -EIO;
|
|
if (!count)
|
|
return 0;
|
|
|
|
return handle_inbound(irq_ptr->input_qs[q_nr], bufnr, count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_add_bufs_to_input_queue);
|
|
|
|
/**
|
|
* handle_outbound - process filled outbound buffers
|
|
* @q: queue containing the buffers
|
|
* @bufnr: first buffer to process
|
|
* @count: how many buffers are filled
|
|
* @aob: asynchronous operation block
|
|
*/
|
|
static int handle_outbound(struct qdio_q *q, unsigned int bufnr, unsigned int count,
|
|
struct qaob *aob)
|
|
{
|
|
unsigned char state = 0;
|
|
int used, rc = 0;
|
|
|
|
qperf_inc(q, outbound_call);
|
|
|
|
count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
|
|
used = atomic_add_return(count, &q->nr_buf_used);
|
|
|
|
if (used == QDIO_MAX_BUFFERS_PER_Q)
|
|
qperf_inc(q, outbound_queue_full);
|
|
|
|
if (queue_type(q) == QDIO_IQDIO_QFMT) {
|
|
unsigned long phys_aob = aob ? virt_to_phys(aob) : 0;
|
|
|
|
WARN_ON_ONCE(!IS_ALIGNED(phys_aob, 256));
|
|
rc = qdio_kick_outbound_q(q, count, phys_aob);
|
|
} else if (qdio_need_siga_sync(q->irq_ptr)) {
|
|
rc = qdio_sync_output_queue(q);
|
|
} else if (count < QDIO_MAX_BUFFERS_PER_Q &&
|
|
get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
|
|
state == SLSB_CU_OUTPUT_PRIMED) {
|
|
/* The previous buffer is not processed yet, tack on. */
|
|
qperf_inc(q, fast_requeue);
|
|
} else {
|
|
rc = qdio_kick_outbound_q(q, count, 0);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* qdio_add_bufs_to_output_queue - process buffers on an Output Queue
|
|
* @cdev: associated ccw_device for the qdio subchannel
|
|
* @q_nr: queue number
|
|
* @bufnr: buffer number
|
|
* @count: how many buffers to process
|
|
* @aob: asynchronous operation block
|
|
*/
|
|
int qdio_add_bufs_to_output_queue(struct ccw_device *cdev, unsigned int q_nr,
|
|
unsigned int bufnr, unsigned int count,
|
|
struct qaob *aob)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
|
|
if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
|
|
return -EINVAL;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addo b:%02x c:%02x", bufnr, count);
|
|
|
|
if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
|
|
return -EIO;
|
|
if (!count)
|
|
return 0;
|
|
|
|
return handle_outbound(irq_ptr->output_qs[q_nr], bufnr, count, aob);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qdio_add_bufs_to_output_queue);
|
|
|
|
/**
|
|
* qdio_start_irq - enable interrupt processing for the device
|
|
* @cdev: associated ccw_device for the qdio subchannel
|
|
*
|
|
* Return codes
|
|
* 0 - success
|
|
* 1 - irqs not started since new data is available
|
|
*/
|
|
int qdio_start_irq(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_q *q;
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
unsigned int i;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
for_each_input_queue(irq_ptr, q, i)
|
|
qdio_stop_polling(q);
|
|
|
|
clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
|
|
|
|
/*
|
|
* We need to check again to not lose initiative after
|
|
* resetting the ACK state.
|
|
*/
|
|
if (test_nonshared_ind(irq_ptr))
|
|
goto rescan;
|
|
|
|
for_each_input_queue(irq_ptr, q, i) {
|
|
if (!qdio_inbound_q_done(q, q->first_to_check))
|
|
goto rescan;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rescan:
|
|
if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
|
|
}
|
|
EXPORT_SYMBOL(qdio_start_irq);
|
|
|
|
/**
|
|
* qdio_stop_irq - disable interrupt processing for the device
|
|
* @cdev: associated ccw_device for the qdio subchannel
|
|
*
|
|
* Return codes
|
|
* 0 - interrupts were already disabled
|
|
* 1 - interrupts successfully disabled
|
|
*/
|
|
int qdio_stop_irq(struct ccw_device *cdev)
|
|
{
|
|
struct qdio_irq *irq_ptr = cdev->private->qdio_data;
|
|
|
|
if (!irq_ptr)
|
|
return -ENODEV;
|
|
|
|
if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(qdio_stop_irq);
|
|
|
|
static int __init init_QDIO(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = qdio_debug_init();
|
|
if (rc)
|
|
return rc;
|
|
rc = qdio_setup_init();
|
|
if (rc)
|
|
goto out_debug;
|
|
rc = qdio_thinint_init();
|
|
if (rc)
|
|
goto out_cache;
|
|
return 0;
|
|
|
|
out_cache:
|
|
qdio_setup_exit();
|
|
out_debug:
|
|
qdio_debug_exit();
|
|
return rc;
|
|
}
|
|
|
|
static void __exit exit_QDIO(void)
|
|
{
|
|
qdio_thinint_exit();
|
|
qdio_setup_exit();
|
|
qdio_debug_exit();
|
|
}
|
|
|
|
module_init(init_QDIO);
|
|
module_exit(exit_QDIO);
|