drivers/infiniband/hw/hfi1/intr.c - third_party/kernel - Git at Google

 // 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);
 }
	// 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);
	}