efclib.c

 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
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 void
60efc_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}