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-rw-r--r--drivers/infiniband/hw/hfi1/intr.c221
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/intr.c b/drivers/infiniband/hw/hfi1/intr.c
new file mode 100644
index 0000000000..70376e6dba
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/intr.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2015, 2016 Intel Corporation.
+ */
+
+#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);
+}