1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2015, 2016 Intel Corporation.
4 */
5
6#include <linux/pci.h>
7#include <linux/delay.h>
8#include <linux/bitmap.h>
9
10#include "hfi.h"
11#include "common.h"
12#include "sdma.h"
13
14#define LINK_UP_DELAY 500 /* in microseconds */
15
16static void set_mgmt_allowed(struct hfi1_pportdata *ppd)
17{
18 u32 frame;
19 struct hfi1_devdata *dd = ppd->dd;
20
21 if (ppd->neighbor_type == NEIGHBOR_TYPE_HFI) {
22 ppd->mgmt_allowed = 1;
23 } else {
24 read_8051_config(dd, REMOTE_LNI_INFO, GENERAL_CONFIG, &frame);
25 ppd->mgmt_allowed = (frame >> MGMT_ALLOWED_SHIFT)
26 & MGMT_ALLOWED_MASK;
27 }
28}
29
30/*
31 * Our neighbor has indicated that we are allowed to act as a fabric
32 * manager, so place the full management partition key in the second
33 * (0-based) pkey array position. Note that we should already have
34 * the limited management partition key in array element 1, and also
35 * that the port is not yet up when add_full_mgmt_pkey() is invoked.
36 */
37static void add_full_mgmt_pkey(struct hfi1_pportdata *ppd)
38{
39 struct hfi1_devdata *dd = ppd->dd;
40
41 /* Sanity check - ppd->pkeys[2] should be 0, or already initialized */
42 if (!((ppd->pkeys[2] == 0) || (ppd->pkeys[2] == FULL_MGMT_P_KEY)))
43 dd_dev_warn(dd, "%s pkey[2] already set to 0x%x, resetting it to 0x%x\n",
44 __func__, ppd->pkeys[2], FULL_MGMT_P_KEY);
45 ppd->pkeys[2] = FULL_MGMT_P_KEY;
46 (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_PKEYS, val: 0);
47 hfi1_event_pkey_change(dd: ppd->dd, port: ppd->port);
48}
49
50static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
51{
52 struct ib_event event;
53 struct hfi1_devdata *dd = ppd->dd;
54
55 /*
56 * Only call ib_dispatch_event() if the IB device has been
57 * registered. HFI1_INITED is set iff the driver has successfully
58 * registered with the IB core.
59 */
60 if (!(dd->flags & HFI1_INITTED))
61 return;
62 event.device = &dd->verbs_dev.rdi.ibdev;
63 event.element.port_num = ppd->port;
64 event.event = ev;
65 ib_dispatch_event(event: &event);
66}
67
68/**
69 * handle_linkup_change - finish linkup/down state changes
70 * @dd: valid device
71 * @linkup: link state information
72 *
73 * Handle a linkup or link down notification.
74 * The HW needs time to finish its link up state change. Give it that chance.
75 *
76 * This is called outside an interrupt.
77 *
78 */
79void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
80{
81 struct hfi1_pportdata *ppd = &dd->pport[0];
82 enum ib_event_type ev;
83
84 if (!(ppd->linkup ^ !!linkup))
85 return; /* no change, nothing to do */
86
87 if (linkup) {
88 /*
89 * Quick linkup and all link up on the simulator does not
90 * trigger or implement:
91 * - VerifyCap interrupt
92 * - VerifyCap frames
93 * But rather moves directly to LinkUp.
94 *
95 * Do the work of the VerifyCap interrupt handler,
96 * handle_verify_cap(), but do not try moving the state to
97 * LinkUp as we are already there.
98 *
99 * NOTE: This uses this device's vAU, vCU, and vl15_init for
100 * the remote values. Both sides must be using the values.
101 */
102 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
103 set_up_vau(dd, vau: dd->vau);
104 set_up_vl15(dd, vl15buf: dd->vl15_init);
105 assign_remote_cm_au_table(dd, vcu: dd->vcu);
106 }
107
108 ppd->neighbor_guid =
109 read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
110 ppd->neighbor_type =
111 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
112 DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
113 ppd->neighbor_port_number =
114 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
115 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
116 ppd->neighbor_fm_security =
117 read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) &
118 DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK;
119 dd_dev_info(dd,
120 "Neighbor Guid %llx, Type %d, Port Num %d\n",
121 ppd->neighbor_guid, ppd->neighbor_type,
122 ppd->neighbor_port_number);
123
124 /* HW needs LINK_UP_DELAY to settle, give it that chance */
125 udelay(LINK_UP_DELAY);
126
127 /*
128 * 'MgmtAllowed' information, which is exchanged during
129 * LNI, is available at this point.
130 */
131 set_mgmt_allowed(ppd);
132
133 if (ppd->mgmt_allowed)
134 add_full_mgmt_pkey(ppd);
135
136 /* physical link went up */
137 ppd->linkup = 1;
138 ppd->offline_disabled_reason =
139 HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);
140
141 /* link widths are not available until the link is fully up */
142 get_linkup_link_widths(ppd);
143
144 } else {
145 /* physical link went down */
146 ppd->linkup = 0;
147
148 /* clear HW details of the previous connection */
149 ppd->actual_vls_operational = 0;
150 reset_link_credits(dd);
151
152 /* freeze after a link down to guarantee a clean egress */
153 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);
154
155 ev = IB_EVENT_PORT_ERR;
156
157 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
158
159 /* if we are down, the neighbor is down */
160 ppd->neighbor_normal = 0;
161
162 /* notify IB of the link change */
163 signal_ib_event(ppd, ev);
164 }
165}
166
167/*
168 * Handle receive or urgent interrupts for user contexts. This means a user
169 * process was waiting for a packet to arrive, and didn't want to poll.
170 */
171void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
172{
173 struct hfi1_devdata *dd = rcd->dd;
174 unsigned long flags;
175
176 spin_lock_irqsave(&dd->uctxt_lock, flags);
177 if (bitmap_empty(src: rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
178 goto done;
179
180 if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, addr: &rcd->event_flags)) {
181 wake_up_interruptible(&rcd->wait);
182 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd);
183 } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
184 addr: &rcd->event_flags)) {
185 rcd->urgent++;
186 wake_up_interruptible(&rcd->wait);
187 }
188done:
189 spin_unlock_irqrestore(lock: &dd->uctxt_lock, flags);
190}
191

source code of linux/drivers/infiniband/hw/hfi1/intr.c