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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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s390/qeth: don't poll for cmd IO completion
All callers are running in process context now, so we can safely sleep in qeth_send_control_data() while waiting for a cmd to complete. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann
David S. Miller
parent
df2a2a5225
commit
782e4a7921
@ -10,6 +10,7 @@
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#ifndef __QETH_CORE_H__
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#define __QETH_CORE_H__
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#include <linux/completion.h>
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#include <linux/if.h>
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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@ -21,6 +22,7 @@
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#include <linux/hashtable.h>
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#include <linux/ip.h>
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#include <linux/refcount.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <net/ipv6.h>
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@ -585,6 +587,7 @@ struct qeth_cmd_buffer {
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enum qeth_cmd_buffer_state state;
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struct qeth_channel *channel;
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struct qeth_reply *reply;
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long timeout;
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unsigned char *data;
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void (*callback)(struct qeth_card *card, struct qeth_channel *channel,
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struct qeth_cmd_buffer *iob);
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@ -610,6 +613,11 @@ struct qeth_channel {
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int io_buf_no;
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};
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static inline bool qeth_trylock_channel(struct qeth_channel *channel)
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{
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return atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0;
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}
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/**
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* OSA card related definitions
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*/
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@ -636,12 +644,11 @@ struct qeth_seqno {
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struct qeth_reply {
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struct list_head list;
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wait_queue_head_t wait_q;
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struct completion received;
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int (*callback)(struct qeth_card *, struct qeth_reply *,
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unsigned long);
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u32 seqno;
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unsigned long offset;
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atomic_t received;
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int rc;
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void *param;
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refcount_t refcnt;
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@ -542,11 +542,10 @@ static struct qeth_reply *qeth_alloc_reply(struct qeth_card *card)
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{
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struct qeth_reply *reply;
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reply = kzalloc(sizeof(struct qeth_reply), GFP_ATOMIC);
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reply = kzalloc(sizeof(*reply), GFP_KERNEL);
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if (reply) {
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refcount_set(&reply->refcnt, 1);
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atomic_set(&reply->received, 0);
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init_waitqueue_head(&reply->wait_q);
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init_completion(&reply->received);
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}
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return reply;
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}
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@ -578,8 +577,7 @@ static void qeth_dequeue_reply(struct qeth_card *card, struct qeth_reply *reply)
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static void qeth_notify_reply(struct qeth_reply *reply)
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{
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atomic_inc(&reply->received);
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wake_up(&reply->wait_q);
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complete(&reply->received);
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}
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static void qeth_issue_ipa_msg(struct qeth_ipa_cmd *cmd, int rc,
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@ -704,6 +702,7 @@ static struct qeth_cmd_buffer *__qeth_get_buffer(struct qeth_channel *channel)
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do {
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if (channel->iob[index].state == BUF_STATE_FREE) {
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channel->iob[index].state = BUF_STATE_LOCKED;
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channel->iob[index].timeout = QETH_TIMEOUT;
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channel->io_buf_no = (channel->io_buf_no + 1) %
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QETH_CMD_BUFFER_NO;
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memset(channel->iob[index].data, 0, QETH_BUFSIZE);
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@ -1786,8 +1785,7 @@ static int qeth_idx_activate_get_answer(struct qeth_card *card,
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iob->callback = reply_cb;
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qeth_setup_ccw(channel->ccw, CCW_CMD_READ, QETH_BUFSIZE, iob->data);
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wait_event(card->wait_q,
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atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0);
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wait_event(card->wait_q, qeth_trylock_channel(channel));
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QETH_DBF_TEXT(SETUP, 6, "noirqpnd");
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spin_lock_irq(get_ccwdev_lock(channel->ccwdev));
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rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw,
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@ -1855,8 +1853,7 @@ static int qeth_idx_activate_channel(struct qeth_card *card,
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temp = (card->info.cula << 8) + card->info.unit_addr2;
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memcpy(QETH_IDX_ACT_QDIO_DEV_REALADDR(iob->data), &temp, 2);
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wait_event(card->wait_q,
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atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0);
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wait_event(card->wait_q, qeth_trylock_channel(channel));
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QETH_DBF_TEXT(SETUP, 6, "noirqpnd");
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spin_lock_irq(get_ccwdev_lock(channel->ccwdev));
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rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw,
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@ -2034,9 +2031,9 @@ static int qeth_send_control_data(struct qeth_card *card, int len,
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void *reply_param)
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{
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struct qeth_channel *channel = iob->channel;
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long timeout = iob->timeout;
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int rc;
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struct qeth_reply *reply = NULL;
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unsigned long timeout, event_timeout;
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struct qeth_ipa_cmd *cmd = NULL;
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QETH_CARD_TEXT(card, 2, "sendctl");
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@ -2057,27 +2054,30 @@ static int qeth_send_control_data(struct qeth_card *card, int len,
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qeth_get_reply(reply);
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iob->reply = reply;
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while (atomic_cmpxchg(&channel->irq_pending, 0, 1)) ;
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timeout = wait_event_interruptible_timeout(card->wait_q,
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qeth_trylock_channel(channel),
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timeout);
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if (timeout <= 0) {
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qeth_put_reply(reply);
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qeth_release_buffer(channel, iob);
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return (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
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}
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if (IS_IPA(iob->data)) {
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cmd = __ipa_cmd(iob);
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cmd->hdr.seqno = card->seqno.ipa++;
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reply->seqno = cmd->hdr.seqno;
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event_timeout = QETH_IPA_TIMEOUT;
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} else {
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reply->seqno = QETH_IDX_COMMAND_SEQNO;
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event_timeout = QETH_TIMEOUT;
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}
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qeth_prepare_control_data(card, len, iob);
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qeth_enqueue_reply(card, reply);
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timeout = jiffies + event_timeout;
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QETH_CARD_TEXT(card, 6, "noirqpnd");
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spin_lock_irq(get_ccwdev_lock(channel->ccwdev));
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rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw,
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(addr_t) iob, 0, 0, event_timeout);
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(addr_t) iob, 0, 0, timeout);
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spin_unlock_irq(get_ccwdev_lock(channel->ccwdev));
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if (rc) {
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QETH_DBF_MESSAGE(2, "qeth_send_control_data on device %x: ccw_device_start rc = %i\n",
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@ -2091,30 +2091,16 @@ static int qeth_send_control_data(struct qeth_card *card, int len,
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return rc;
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}
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/* we have only one long running ipassist, since we can ensure
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process context of this command we can sleep */
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if (cmd && cmd->hdr.command == IPA_CMD_SETIP &&
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cmd->hdr.prot_version == QETH_PROT_IPV4) {
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if (!wait_event_timeout(reply->wait_q,
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atomic_read(&reply->received), event_timeout))
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goto time_err;
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} else {
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while (!atomic_read(&reply->received)) {
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if (time_after(jiffies, timeout))
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goto time_err;
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cpu_relax();
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}
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}
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timeout = wait_for_completion_interruptible_timeout(&reply->received,
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timeout);
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if (timeout <= 0)
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rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
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qeth_dequeue_reply(card, reply);
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rc = reply->rc;
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if (!rc)
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rc = reply->rc;
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qeth_put_reply(reply);
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return rc;
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time_err:
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qeth_dequeue_reply(card, reply);
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qeth_put_reply(reply);
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return -ETIME;
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}
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static int qeth_cm_enable_cb(struct qeth_card *card, struct qeth_reply *reply,
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@ -2810,6 +2796,8 @@ void qeth_prepare_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob,
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u16 total_length = IPA_PDU_HEADER_SIZE + cmd_length;
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u8 prot_type = qeth_mpc_select_prot_type(card);
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iob->timeout = QETH_IPA_TIMEOUT;
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memcpy(iob->data, IPA_PDU_HEADER, IPA_PDU_HEADER_SIZE);
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memcpy(QETH_IPA_PDU_LEN_TOTAL(iob->data), &total_length, 2);
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memcpy(QETH_IPA_CMD_PROT_TYPE(iob->data), &prot_type, 1);
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@ -1050,13 +1050,12 @@ static int qeth_osn_send_control_data(struct qeth_card *card, int len,
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QETH_CARD_TEXT(card, 5, "osndctrd");
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wait_event(card->wait_q,
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atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0);
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wait_event(card->wait_q, qeth_trylock_channel(channel));
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qeth_prepare_control_data(card, len, iob);
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QETH_CARD_TEXT(card, 6, "osnoirqp");
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spin_lock_irq(get_ccwdev_lock(channel->ccwdev));
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rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw,
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(addr_t) iob, 0, 0, QETH_IPA_TIMEOUT);
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(addr_t) iob, 0, 0, iob->timeout);
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spin_unlock_irq(get_ccwdev_lock(channel->ccwdev));
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if (rc) {
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QETH_DBF_MESSAGE(2, "qeth_osn_send_control_data: "
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