1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2004, 2005 MIPS Technologies, Inc.  All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
8 */
9#include <linux/kernel.h>
10#include <linux/device.h>
11#include <linux/fs.h>
12#include <linux/slab.h>
13#include <linux/export.h>
14
15#include <asm/vpe.h>
16
17static int major;
18
19void cleanup_tc(struct tc *tc)
20{
21
22}
23
24static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
25			  const char *buf, size_t len)
26{
27	struct vpe *vpe = get_vpe(aprp_cpu_index());
28	struct vpe_notifications *notifier;
29
30	list_for_each_entry(notifier, &vpe->notify, list)
31		notifier->stop(aprp_cpu_index());
32
33	release_progmem(vpe->load_addr);
34	vpe->state = VPE_STATE_UNUSED;
35
36	return len;
37}
38static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
39
40static ssize_t ntcs_show(struct device *cd, struct device_attribute *attr,
41			 char *buf)
42{
43	struct vpe *vpe = get_vpe(aprp_cpu_index());
44
45	return sprintf(buf, "%d\n", vpe->ntcs);
46}
47
48static ssize_t ntcs_store(struct device *dev, struct device_attribute *attr,
49			  const char *buf, size_t len)
50{
51	struct vpe *vpe = get_vpe(aprp_cpu_index());
52	unsigned long new;
53	int ret;
54
55	ret = kstrtoul(buf, 0, &new);
56	if (ret < 0)
57		return ret;
58
59	/* APRP can only reserve one TC in a VPE and no more. */
60	if (new != 1)
61		return -EINVAL;
62
63	vpe->ntcs = new;
64
65	return len;
66}
67static DEVICE_ATTR_RW(ntcs);
68
69static struct attribute *vpe_attrs[] = {
70	&dev_attr_kill.attr,
71	&dev_attr_ntcs.attr,
72	NULL,
73};
74ATTRIBUTE_GROUPS(vpe);
75
76static void vpe_device_release(struct device *cd)
77{
78	kfree(cd);
79}
80
81static struct class vpe_class = {
82	.name = "vpe",
83	.owner = THIS_MODULE,
84	.dev_release = vpe_device_release,
85	.dev_groups = vpe_groups,
86};
87
88static struct device vpe_device;
89
90int __init vpe_module_init(void)
91{
92	struct vpe *v = NULL;
93	struct tc *t;
94	int err;
95
96	if (!cpu_has_mipsmt) {
97		pr_warn("VPE loader: not a MIPS MT capable processor\n");
98		return -ENODEV;
99	}
100
101	if (num_possible_cpus() - aprp_cpu_index() < 1) {
102		pr_warn("No VPEs reserved for AP/SP, not initialize VPE loader\n"
103			"Pass maxcpus=<n> argument as kernel argument\n");
104		return -ENODEV;
105	}
106
107	major = register_chrdev(0, VPE_MODULE_NAME, &vpe_fops);
108	if (major < 0) {
109		pr_warn("VPE loader: unable to register character device\n");
110		return major;
111	}
112
113	err = class_register(&vpe_class);
114	if (err) {
115		pr_err("vpe_class registration failed\n");
116		goto out_chrdev;
117	}
118
119	device_initialize(&vpe_device);
120	vpe_device.class	= &vpe_class,
121	vpe_device.parent	= NULL,
122	dev_set_name(&vpe_device, "vpe_sp");
123	vpe_device.devt = MKDEV(major, VPE_MODULE_MINOR);
124	err = device_add(&vpe_device);
125	if (err) {
126		pr_err("Adding vpe_device failed\n");
127		goto out_class;
128	}
129
130	t = alloc_tc(aprp_cpu_index());
131	if (!t) {
132		pr_warn("VPE: unable to allocate TC\n");
133		err = -ENOMEM;
134		goto out_dev;
135	}
136
137	/* VPE */
138	v = alloc_vpe(aprp_cpu_index());
139	if (v == NULL) {
140		pr_warn("VPE: unable to allocate VPE\n");
141		kfree(t);
142		err = -ENOMEM;
143		goto out_dev;
144	}
145
146	v->ntcs = 1;
147
148	/* add the tc to the list of this vpe's tc's. */
149	list_add(&t->tc, &v->tc);
150
151	/* TC */
152	t->pvpe = v;	/* set the parent vpe */
153
154	return 0;
155
156out_dev:
157	device_del(&vpe_device);
158
159out_class:
160	class_unregister(&vpe_class);
161
162out_chrdev:
163	unregister_chrdev(major, VPE_MODULE_NAME);
164
165	return err;
166}
167
168void __exit vpe_module_exit(void)
169{
170	struct vpe *v, *n;
171
172	device_del(&vpe_device);
173	class_unregister(&vpe_class);
174	unregister_chrdev(major, VPE_MODULE_NAME);
175
176	/* No locking needed here */
177	list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list)
178		if (v->state != VPE_STATE_UNUSED)
179			release_vpe(v);
180}
181