1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
5 */
6
7 /*
8 * LIBEFC LOCKING
9 *
10 * The critical sections protected by the efc's spinlock are quite broad and
11 * may be improved upon in the future. The libefc code and its locking doesn't
12 * 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. This
15 * means that the entry points into the libefc library are protected by efc
16 * 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
efcport_init(struct efc * efc)23 int 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
59 static void
efc_purge_pending(struct efc * efc)60 efc_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
efcport_destroy(struct efc * efc)75 void 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