1 /* 2 * Copyright(c) 2015, 2016 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/pci.h> 49 #include <linux/delay.h> 50 51 #include "hfi.h" 52 #include "common.h" 53 #include "sdma.h" 54 55 /** 56 * format_hwmsg - format a single hwerror message 57 * @msg message buffer 58 * @msgl length of message buffer 59 * @hwmsg message to add to message buffer 60 */ 61 static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg) 62 { 63 strlcat(msg, "[", msgl); 64 strlcat(msg, hwmsg, msgl); 65 strlcat(msg, "]", msgl); 66 } 67 68 /** 69 * hfi1_format_hwerrors - format hardware error messages for display 70 * @hwerrs hardware errors bit vector 71 * @hwerrmsgs hardware error descriptions 72 * @nhwerrmsgs number of hwerrmsgs 73 * @msg message buffer 74 * @msgl message buffer length 75 */ 76 void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs, 77 size_t nhwerrmsgs, char *msg, size_t msgl) 78 { 79 int i; 80 81 for (i = 0; i < nhwerrmsgs; i++) 82 if (hwerrs & hwerrmsgs[i].mask) 83 format_hwmsg(msg, msgl, hwerrmsgs[i].msg); 84 } 85 86 static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev) 87 { 88 struct ib_event event; 89 struct hfi1_devdata *dd = ppd->dd; 90 91 /* 92 * Only call ib_dispatch_event() if the IB device has been 93 * registered. HFI1_INITED is set iff the driver has successfully 94 * registered with the IB core. 95 */ 96 if (!(dd->flags & HFI1_INITTED)) 97 return; 98 event.device = &dd->verbs_dev.rdi.ibdev; 99 event.element.port_num = ppd->port; 100 event.event = ev; 101 ib_dispatch_event(&event); 102 } 103 104 /* 105 * Handle a linkup or link down notification. 106 * This is called outside an interrupt. 107 */ 108 void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup) 109 { 110 struct hfi1_pportdata *ppd = &dd->pport[0]; 111 enum ib_event_type ev; 112 113 if (!(ppd->linkup ^ !!linkup)) 114 return; /* no change, nothing to do */ 115 116 if (linkup) { 117 /* 118 * Quick linkup and all link up on the simulator does not 119 * trigger or implement: 120 * - VerifyCap interrupt 121 * - VerifyCap frames 122 * But rather moves directly to LinkUp. 123 * 124 * Do the work of the VerifyCap interrupt handler, 125 * handle_verify_cap(), but do not try moving the state to 126 * LinkUp as we are already there. 127 * 128 * NOTE: This uses this device's vAU, vCU, and vl15_init for 129 * the remote values. Both sides must be using the values. 130 */ 131 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) { 132 set_up_vl15(dd, dd->vau, dd->vl15_init); 133 assign_remote_cm_au_table(dd, dd->vcu); 134 ppd->neighbor_guid = 135 read_csr(dd, DC_DC8051_STS_REMOTE_GUID); 136 ppd->neighbor_type = 137 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) & 138 DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK; 139 ppd->neighbor_port_number = 140 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) & 141 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK; 142 dd_dev_info(dd, "Neighbor GUID: %llx Neighbor type %d\n", 143 ppd->neighbor_guid, 144 ppd->neighbor_type); 145 } 146 147 /* physical link went up */ 148 ppd->linkup = 1; 149 ppd->offline_disabled_reason = 150 HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE); 151 152 /* link widths are not available until the link is fully up */ 153 get_linkup_link_widths(ppd); 154 155 } else { 156 /* physical link went down */ 157 ppd->linkup = 0; 158 159 /* clear HW details of the previous connection */ 160 reset_link_credits(dd); 161 162 /* freeze after a link down to guarantee a clean egress */ 163 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN); 164 165 ev = IB_EVENT_PORT_ERR; 166 167 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT); 168 169 /* if we are down, the neighbor is down */ 170 ppd->neighbor_normal = 0; 171 172 /* notify IB of the link change */ 173 signal_ib_event(ppd, ev); 174 } 175 } 176 177 /* 178 * Handle receive or urgent interrupts for user contexts. This means a user 179 * process was waiting for a packet to arrive, and didn't want to poll. 180 */ 181 void handle_user_interrupt(struct hfi1_ctxtdata *rcd) 182 { 183 struct hfi1_devdata *dd = rcd->dd; 184 unsigned long flags; 185 186 spin_lock_irqsave(&dd->uctxt_lock, flags); 187 if (!rcd->cnt) 188 goto done; 189 190 if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) { 191 wake_up_interruptible(&rcd->wait); 192 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd->ctxt); 193 } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG, 194 &rcd->event_flags)) { 195 rcd->urgent++; 196 wake_up_interruptible(&rcd->wait); 197 } 198 done: 199 spin_unlock_irqrestore(&dd->uctxt_lock, flags); 200 } 201