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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, 0);
47 hfi1_event_pkey_change(ppd->dd, ppd->port);
48}
49
50/**
51 * format_hwmsg - format a single hwerror message
52 * @msg: message buffer
53 * @msgl: length of message buffer
54 * @hwmsg: message to add to message buffer
55 */
56static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
57{
58 strlcat(msg, "[", msgl);
59 strlcat(msg, hwmsg, msgl);
60 strlcat(msg, "]", msgl);
61}
62
63/**
64 * hfi1_format_hwerrors - format hardware error messages for display
65 * @hwerrs: hardware errors bit vector
66 * @hwerrmsgs: hardware error descriptions
67 * @nhwerrmsgs: number of hwerrmsgs
68 * @msg: message buffer
69 * @msgl: message buffer length
70 */
71void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
72 size_t nhwerrmsgs, char *msg, size_t msgl)
73{
74 int i;
75
76 for (i = 0; i < nhwerrmsgs; i++)
77 if (hwerrs & hwerrmsgs[i].mask)
78 format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
79}
80
81static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
82{
83 struct ib_event event;
84 struct hfi1_devdata *dd = ppd->dd;
85
86 /*
87 * Only call ib_dispatch_event() if the IB device has been
88 * registered. HFI1_INITED is set iff the driver has successfully
89 * registered with the IB core.
90 */
91 if (!(dd->flags & HFI1_INITTED))
92 return;
93 event.device = &dd->verbs_dev.rdi.ibdev;
94 event.element.port_num = ppd->port;
95 event.event = ev;
96 ib_dispatch_event(&event);
97}
98
99/**
100 * handle_linkup_change - finish linkup/down state changes
101 * @dd: valid device
102 * @linkup: link state information
103 *
104 * Handle a linkup or link down notification.
105 * The HW needs time to finish its link up state change. Give it that chance.
106 *
107 * This is called outside an interrupt.
108 *
109 */
110void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
111{
112 struct hfi1_pportdata *ppd = &dd->pport[0];
113 enum ib_event_type ev;
114
115 if (!(ppd->linkup ^ !!linkup))
116 return; /* no change, nothing to do */
117
118 if (linkup) {
119 /*
120 * Quick linkup and all link up on the simulator does not
121 * trigger or implement:
122 * - VerifyCap interrupt
123 * - VerifyCap frames
124 * But rather moves directly to LinkUp.
125 *
126 * Do the work of the VerifyCap interrupt handler,
127 * handle_verify_cap(), but do not try moving the state to
128 * LinkUp as we are already there.
129 *
130 * NOTE: This uses this device's vAU, vCU, and vl15_init for
131 * the remote values. Both sides must be using the values.
132 */
133 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
134 set_up_vau(dd, dd->vau);
135 set_up_vl15(dd, dd->vl15_init);
136 assign_remote_cm_au_table(dd, dd->vcu);
137 }
138
139 ppd->neighbor_guid =
140 read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
141 ppd->neighbor_type =
142 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
143 DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
144 ppd->neighbor_port_number =
145 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
146 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
147 ppd->neighbor_fm_security =
148 read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) &
149 DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK;
150 dd_dev_info(dd,
151 "Neighbor Guid %llx, Type %d, Port Num %d\n",
152 ppd->neighbor_guid, ppd->neighbor_type,
153 ppd->neighbor_port_number);
154
155 /* HW needs LINK_UP_DELAY to settle, give it that chance */
156 udelay(LINK_UP_DELAY);
157
158 /*
159 * 'MgmtAllowed' information, which is exchanged during
160 * LNI, is available at this point.
161 */
162 set_mgmt_allowed(ppd);
163
164 if (ppd->mgmt_allowed)
165 add_full_mgmt_pkey(ppd);
166
167 /* physical link went up */
168 ppd->linkup = 1;
169 ppd->offline_disabled_reason =
170 HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);
171
172 /* link widths are not available until the link is fully up */
173 get_linkup_link_widths(ppd);
174
175 } else {
176 /* physical link went down */
177 ppd->linkup = 0;
178
179 /* clear HW details of the previous connection */
180 ppd->actual_vls_operational = 0;
181 reset_link_credits(dd);
182
183 /* freeze after a link down to guarantee a clean egress */
184 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);
185
186 ev = IB_EVENT_PORT_ERR;
187
188 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
189
190 /* if we are down, the neighbor is down */
191 ppd->neighbor_normal = 0;
192
193 /* notify IB of the link change */
194 signal_ib_event(ppd, ev);
195 }
196}
197
198/*
199 * Handle receive or urgent interrupts for user contexts. This means a user
200 * process was waiting for a packet to arrive, and didn't want to poll.
201 */
202void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
203{
204 struct hfi1_devdata *dd = rcd->dd;
205 unsigned long flags;
206
207 spin_lock_irqsave(&dd->uctxt_lock, flags);
208 if (bitmap_empty(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
209 goto done;
210
211 if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
212 wake_up_interruptible(&rcd->wait);
213 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd);
214 } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
215 &rcd->event_flags)) {
216 rcd->urgent++;
217 wake_up_interruptible(&rcd->wait);
218 }
219done:
220 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
221}
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, 0);
47 hfi1_event_pkey_change(ppd->dd, ppd->port);
48}
49
50/**
51 * format_hwmsg - format a single hwerror message
52 * @msg: message buffer
53 * @msgl: length of message buffer
54 * @hwmsg: message to add to message buffer
55 */
56static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
57{
58 strlcat(msg, "[", msgl);
59 strlcat(msg, hwmsg, msgl);
60 strlcat(msg, "]", msgl);
61}
62
63/**
64 * hfi1_format_hwerrors - format hardware error messages for display
65 * @hwerrs: hardware errors bit vector
66 * @hwerrmsgs: hardware error descriptions
67 * @nhwerrmsgs: number of hwerrmsgs
68 * @msg: message buffer
69 * @msgl: message buffer length
70 */
71void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
72 size_t nhwerrmsgs, char *msg, size_t msgl)
73{
74 int i;
75
76 for (i = 0; i < nhwerrmsgs; i++)
77 if (hwerrs & hwerrmsgs[i].mask)
78 format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
79}
80
81static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
82{
83 struct ib_event event;
84 struct hfi1_devdata *dd = ppd->dd;
85
86 /*
87 * Only call ib_dispatch_event() if the IB device has been
88 * registered. HFI1_INITED is set iff the driver has successfully
89 * registered with the IB core.
90 */
91 if (!(dd->flags & HFI1_INITTED))
92 return;
93 event.device = &dd->verbs_dev.rdi.ibdev;
94 event.element.port_num = ppd->port;
95 event.event = ev;
96 ib_dispatch_event(&event);
97}
98
99/**
100 * handle_linkup_change - finish linkup/down state changes
101 * @dd: valid device
102 * @linkup: link state information
103 *
104 * Handle a linkup or link down notification.
105 * The HW needs time to finish its link up state change. Give it that chance.
106 *
107 * This is called outside an interrupt.
108 *
109 */
110void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
111{
112 struct hfi1_pportdata *ppd = &dd->pport[0];
113 enum ib_event_type ev;
114
115 if (!(ppd->linkup ^ !!linkup))
116 return; /* no change, nothing to do */
117
118 if (linkup) {
119 /*
120 * Quick linkup and all link up on the simulator does not
121 * trigger or implement:
122 * - VerifyCap interrupt
123 * - VerifyCap frames
124 * But rather moves directly to LinkUp.
125 *
126 * Do the work of the VerifyCap interrupt handler,
127 * handle_verify_cap(), but do not try moving the state to
128 * LinkUp as we are already there.
129 *
130 * NOTE: This uses this device's vAU, vCU, and vl15_init for
131 * the remote values. Both sides must be using the values.
132 */
133 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
134 set_up_vau(dd, dd->vau);
135 set_up_vl15(dd, dd->vl15_init);
136 assign_remote_cm_au_table(dd, dd->vcu);
137 }
138
139 ppd->neighbor_guid =
140 read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
141 ppd->neighbor_type =
142 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
143 DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
144 ppd->neighbor_port_number =
145 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
146 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
147 ppd->neighbor_fm_security =
148 read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) &
149 DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK;
150 dd_dev_info(dd,
151 "Neighbor Guid %llx, Type %d, Port Num %d\n",
152 ppd->neighbor_guid, ppd->neighbor_type,
153 ppd->neighbor_port_number);
154
155 /* HW needs LINK_UP_DELAY to settle, give it that chance */
156 udelay(LINK_UP_DELAY);
157
158 /*
159 * 'MgmtAllowed' information, which is exchanged during
160 * LNI, is available at this point.
161 */
162 set_mgmt_allowed(ppd);
163
164 if (ppd->mgmt_allowed)
165 add_full_mgmt_pkey(ppd);
166
167 /* physical link went up */
168 ppd->linkup = 1;
169 ppd->offline_disabled_reason =
170 HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);
171
172 /* link widths are not available until the link is fully up */
173 get_linkup_link_widths(ppd);
174
175 } else {
176 /* physical link went down */
177 ppd->linkup = 0;
178
179 /* clear HW details of the previous connection */
180 ppd->actual_vls_operational = 0;
181 reset_link_credits(dd);
182
183 /* freeze after a link down to guarantee a clean egress */
184 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);
185
186 ev = IB_EVENT_PORT_ERR;
187
188 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
189
190 /* if we are down, the neighbor is down */
191 ppd->neighbor_normal = 0;
192
193 /* notify IB of the link change */
194 signal_ib_event(ppd, ev);
195 }
196}
197
198/*
199 * Handle receive or urgent interrupts for user contexts. This means a user
200 * process was waiting for a packet to arrive, and didn't want to poll.
201 */
202void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
203{
204 struct hfi1_devdata *dd = rcd->dd;
205 unsigned long flags;
206
207 spin_lock_irqsave(&dd->uctxt_lock, flags);
208 if (bitmap_empty(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
209 goto done;
210
211 if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
212 wake_up_interruptible(&rcd->wait);
213 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd);
214 } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
215 &rcd->event_flags)) {
216 rcd->urgent++;
217 wake_up_interruptible(&rcd->wait);
218 }
219done:
220 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
221}