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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.5 */6 7/*8 * LIBEFC LOCKING9 *10 * The critical sections protected by the efc's spinlock are quite broad and11 * may be improved upon in the future. The libefc code and its locking doesn't12 * influence the I/O path, so excessive locking doesn't impact I/O performance.13 *14 * The strategy is to lock whenever processing a request from user driver. This15 * means that the entry points into the libefc library are protected by efc16 * lock. So all the state machine transitions are protected.17 */18 19#include <linux/module.h>20#include <linux/kernel.h>21#include "efc.h"22 23int efcport_init(struct efc *efc)24{25 u32 rc = 0;26 27 spin_lock_init(&efc->lock);28 INIT_LIST_HEAD(&efc->vport_list);29 efc->hold_frames = false;30 spin_lock_init(&efc->pend_frames_lock);31 INIT_LIST_HEAD(&efc->pend_frames);32 33 /* Create Node pool */34 efc->node_pool = mempool_create_kmalloc_pool(EFC_MAX_REMOTE_NODES,35 sizeof(struct efc_node));36 if (!efc->node_pool) {37 efc_log_err(efc, "Can't allocate node pool\n");38 return -ENOMEM;39 }40 41 efc->node_dma_pool = dma_pool_create("node_dma_pool", &efc->pci->dev,42 NODE_SPARAMS_SIZE, 0, 0);43 if (!efc->node_dma_pool) {44 efc_log_err(efc, "Can't allocate node dma pool\n");45 mempool_destroy(efc->node_pool);46 return -ENOMEM;47 }48 49 efc->els_io_pool = mempool_create_kmalloc_pool(EFC_ELS_IO_POOL_SZ,50 sizeof(struct efc_els_io_req));51 if (!efc->els_io_pool) {52 efc_log_err(efc, "Can't allocate els io pool\n");53 return -ENOMEM;54 }55 56 return rc;57}58 59static void60efc_purge_pending(struct efc *efc)61{62 struct efc_hw_sequence *frame, *next;63 unsigned long flags = 0;64 65 spin_lock_irqsave(&efc->pend_frames_lock, flags);66 67 list_for_each_entry_safe(frame, next, &efc->pend_frames, list_entry) {68 list_del(&frame->list_entry);69 efc->tt.hw_seq_free(efc, frame);70 }71 72 spin_unlock_irqrestore(&efc->pend_frames_lock, flags);73}74 75void efcport_destroy(struct efc *efc)76{77 efc_purge_pending(efc);78 mempool_destroy(efc->els_io_pool);79 mempool_destroy(efc->node_pool);80 dma_pool_destroy(efc->node_dma_pool);81}82