path: root/drivers/scsi/elx/libefc/efc_domain.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 */

/*
 * domain_sm Domain State Machine: States
 */

#include "efc.h"

int
efc_domain_cb(void *arg, int event, void *data)
{
	struct efc *efc = arg;
	struct efc_domain *domain = NULL;
	int rc = 0;
	unsigned long flags = 0;

	if (event != EFC_HW_DOMAIN_FOUND)
		domain = data;

	/* Accept domain callback events from the user driver */
	spin_lock_irqsave(&efc->lock, flags);
	switch (event) {
	case EFC_HW_DOMAIN_FOUND: {
		u64 fcf_wwn = 0;
		struct efc_domain_record *drec = data;

		/* extract the fcf_wwn */
		fcf_wwn = be64_to_cpu(*((__be64 *)drec->wwn));

		efc_log_debug(efc, "Domain found: wwn %016llX\n", fcf_wwn);

		/* lookup domain, or allocate a new one */
		domain = efc->domain;
		if (!domain) {
			domain = efc_domain_alloc(efc, fcf_wwn);
			if (!domain) {
				efc_log_err(efc, "efc_domain_alloc() failed\n");
				rc = -1;
				break;
			}
			efc_sm_transition(&domain->drvsm, __efc_domain_init,
					  NULL);
		}
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_FOUND, drec);
		break;
	}

	case EFC_HW_DOMAIN_LOST:
		domain_trace(domain, "EFC_HW_DOMAIN_LOST:\n");
		efc->hold_frames = true;
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_LOST, NULL);
		break;

	case EFC_HW_DOMAIN_ALLOC_OK:
		domain_trace(domain, "EFC_HW_DOMAIN_ALLOC_OK:\n");
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_ALLOC_OK, NULL);
		break;

	case EFC_HW_DOMAIN_ALLOC_FAIL:
		domain_trace(domain, "EFC_HW_DOMAIN_ALLOC_FAIL:\n");
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_ALLOC_FAIL,
				      NULL);
		break;

	case EFC_HW_DOMAIN_ATTACH_OK:
		domain_trace(domain, "EFC_HW_DOMAIN_ATTACH_OK:\n");
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_ATTACH_OK, NULL);
		break;

	case EFC_HW_DOMAIN_ATTACH_FAIL:
		domain_trace(domain, "EFC_HW_DOMAIN_ATTACH_FAIL:\n");
		efc_domain_post_event(domain,
				      EFC_EVT_DOMAIN_ATTACH_FAIL, NULL);
		break;

	case EFC_HW_DOMAIN_FREE_OK:
		domain_trace(domain, "EFC_HW_DOMAIN_FREE_OK:\n");
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_FREE_OK, NULL);
		break;

	case EFC_HW_DOMAIN_FREE_FAIL:
		domain_trace(domain, "EFC_HW_DOMAIN_FREE_FAIL:\n");
		efc_domain_post_event(domain, EFC_EVT_DOMAIN_FREE_FAIL, NULL);
		break;

	default:
		efc_log_warn(efc, "unsupported event %#x\n", event);
	}
	spin_unlock_irqrestore(&efc->lock, flags);

	if (efc->domain && domain->req_accept_frames) {
		domain->req_accept_frames = false;
		efc->hold_frames = false;
	}

	return rc;
}

static void
_efc_domain_free(struct kref *arg)
{
	struct efc_domain *domain = container_of(arg, struct efc_domain, ref);
	struct efc *efc = domain->efc;

	if (efc->domain_free_cb)
		(*efc->domain_free_cb)(efc, efc->domain_free_cb_arg);

	kfree(domain);
}

void
efc_domain_free(struct efc_domain *domain)
{
	struct efc *efc;

	efc = domain->efc;

	/* Hold frames to clear the domain pointer from the xport lookup */
	efc->hold_frames = false;

	efc_log_debug(efc, "Domain free: wwn %016llX\n", domain->fcf_wwn);

	xa_destroy(&domain->lookup);
	efc->domain = NULL;
	kref_put(&domain->ref, domain->release);
}

struct efc_domain *
efc_domain_alloc(struct efc *efc, uint64_t fcf_wwn)
{
	struct efc_domain *domain;

	domain = kzalloc(sizeof(*domain), GFP_ATOMIC);
	if (!domain)
		return NULL;

	domain->efc = efc;
	domain->drvsm.app = domain;

	/* initialize refcount */
	kref_init(&domain->ref);
	domain->release = _efc_domain_free;

	xa_init(&domain->lookup);

	INIT_LIST_HEAD(&domain->nport_list);
	efc->domain = domain;
	domain->fcf_wwn = fcf_wwn;
	efc_log_debug(efc, "Domain allocated: wwn %016llX\n", domain->fcf_wwn);

	return domain;
}

void
efc_register_domain_free_cb(struct efc *efc,
			    void (*callback)(struct efc *efc, void *arg),
			    void *arg)
{
	/* Register a callback to be called when the domain is freed */
	efc->domain_free_cb = callback;
	efc->domain_free_cb_arg = arg;
	if (!efc->domain && callback)
		(*callback)(ef