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/*
* Copyright(c) 2015, 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/pci.h>
#include <linux/delay.h>
#include "hfi.h"
#include "common.h"
#include "sdma.h"
/**
* format_hwmsg - format a single hwerror message
* @msg message buffer
* @msgl length of message buffer
* @hwmsg message to add to message buffer
*/
static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
{
strlcat(msg, "[", msgl);
strlcat(msg, hwmsg, msgl);
strlcat(msg, "]", msgl);
}
/**
* hfi1_format_hwerrors - format hardware error messages for display
* @hwerrs hardware errors bit vector
* @hwerrmsgs hardware error descriptions
* @nhwerrmsgs number of hwerrmsgs
* @msg message buffer
* @msgl message buffer length
*/
void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
size_t nhwerrmsgs, char *msg, size_t msgl)
{
int i;
for (i = 0; i < nhwerrmsgs; i++)
if (hwerrs & hwerrmsgs[i].mask)
format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
}
static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
{
struct ib_event event;
struct hfi1_devdata *dd = ppd->dd;
/*
* Only call ib_dispatch_event() if the IB device has been
* registered. HFI1_INITED is set iff the driver has successfully
* registered with the IB core.
*/
if (!(dd->flags & HFI1_INITTED))
return;
event.device = &dd->verbs_dev.rdi.ibdev;
event.element.port_num = ppd->port;
event.event = ev;
ib_dispatch_event(&event);
}
/*
* Handle a linkup or link down notification.
* This is called outside an interrupt.
*/
void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
{
struct hfi1_pportdata *ppd = &dd->pport[0];
enum ib_event_type ev;
if (!(ppd->linkup ^ !!linkup))
return; /* no change, nothing to do */
if (linkup) {
/*
* Quick linkup and all link up on the simulator does not
* trigger or implement:
* - VerifyCap interrupt
* - VerifyCap frames
* But rather moves directly to LinkUp.
*
* Do the work of the VerifyCap interrupt handler,
* handle_verify_cap(), but do not try moving the state to
* LinkUp as we are already there.
*
* NOTE: This uses this device's vAU, vCU, and vl15_init for
* the remote values. Both sides must be using the values.
*/
if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
set_up_vl15(dd, dd->vau, dd->vl15_init);
assign_remote_cm_au_table(dd, dd->vcu);
ppd->neighbor_guid =
read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
ppd->neighbor_type =
read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
ppd->neighbor_port_number =
read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
dd_dev_info(dd, "Neighbor GUID: %llx Neighbor type %d\n",
ppd->neighbor_guid,
ppd->neighbor_type);
}
/* physical link went up */
ppd->linkup = 1;
ppd->offline_disabled_reason =
HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);
/* link widths are not available until the link is fully up */
get_linkup_link_widths(ppd);
} else {
/* physical link went down */
ppd->linkup = 0;
/* clear HW details of the previous connection */
reset_link_credits(dd);
/* freeze after a link down to guarantee a clean egress */
start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);
ev = IB_EVENT_PORT_ERR;
hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
/* if we are down, the neighbor is down */
ppd->neighbor_normal = 0;
/* notify IB of the link change */
signal_ib_event(ppd, ev);
}
}
/*
* Handle receive or urgent interrupts for user contexts. This means a user
* process was waiting for a packet to arrive, and didn't want to poll.
*/
void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
{
struct hfi1_devdata *dd = rcd->dd;
unsigned long flags;
spin_lock_irqsave(&dd->uctxt_lock, flags);
if (!rcd->cnt)
goto done;
if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
wake_up_interruptible(&rcd->wait);
hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd->ctxt);
} else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
&rcd->event_flags)) {
rcd->urgent++;
wake_up_interruptible(&rcd->wait);
}
done:
spin_unlock_irqrestore(&dd->uctxt_lock, flags);
}
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