/*
* 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 <linux/bitmap.h>
#include "hfi.h"
#include "common.h"
#include "sdma.h"
#define LINK_UP_DELAY 500 /* in microseconds */
static void set_mgmt_allowed(struct hfi1_pportdata *ppd)
{
u32 frame;
struct hfi1_devdata *dd = ppd->dd;
if (ppd->neighbor_type == NEIGHBOR_TYPE_HFI) {
ppd->mgmt_allowed = 1;
} else {
read_8051_config(dd, REMOTE_LNI_INFO, GENERAL_CONFIG, &frame);
ppd->mgmt_allowed = (frame >> MGMT_ALLOWED_SHIFT)
& MGMT_ALLOWED_MASK;
}
}
/*
* Our neighbor has indicated that we are allowed to act as a fabric
* manager, so place the full management partition key in the second
* (0-based) pkey array position. Note that we should already have
* the limited management partition key in array element 1, and also
* that the port is not yet up when add_full_mgmt_pkey() is invoked.
*/
static void add_full_mgmt_pkey(struct hfi1_pportdata *ppd)
{
struct hfi1_devdata *dd = ppd->dd;
/* Sanity check - ppd->pkeys[2] should be 0, or already initialized */
if (!((ppd->pkeys[2] == 0) || (ppd->pkeys[2] == FULL_MGMT_P_KEY)))
dd_dev_warn(dd, "%s pkey[2] already set to 0x%x, resetting it to 0x%x\n",
__func__, ppd->pkeys[2], FULL_MGMT_P_KEY);
ppd->pkeys[2] = FULL_MGMT_P_KEY;
(void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_PKEYS, 0);
hfi1_event_pkey_change(ppd->dd, ppd->port);
}
/**
* 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_linkup_change - finish linkup/down state changes
* @dd: valid device
* @linkup: link state information
*
* Handle a linkup or link down notification.
* The HW needs time to finish its link up state change. Give it that chance.
*
* 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_vau(dd, dd->vau);
set_up_vl15(dd, 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;
ppd->neighbor_fm_security =
read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) &
DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK;
dd_dev_info(dd,
"Neighbor Guid %llx, Type %d, Port Num %d\n",
ppd->neighbor_guid, ppd->neighbor_type,
ppd->neighbor_port_number);
/* HW needs LINK_UP_DELAY to settle, give it that chance */
udelay(LINK_UP_DELAY);
/*
* 'MgmtAllowed' information, which is exchanged during
* LNI, is available at this point.
*/
set_mgmt_allowed(ppd);
if (ppd->mgmt_allowed)
add_full_mgmt_pkey(ppd);
/* 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 */
ppd->actual_vls_operational = 0;
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 (bitmap_empty(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
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);
} 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);
}