intr.c

  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
 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);
 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, dd->vau);
104			set_up_vl15(dd, dd->vl15_init);
105			assign_remote_cm_au_table(dd, 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(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
178		goto done;
179
180	if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &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							&rcd->event_flags)) {
185		rcd->urgent++;
186		wake_up_interruptible(&rcd->wait);
187	}
188done:
189	spin_unlock_irqrestore(&dd->uctxt_lock, flags);
190}