Deng-Cheng Zhu | 17a1d52 | 2013-10-30 15:52:07 -0500 | [diff] [blame] | 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 | |
| 17 | static int major; |
| 18 | |
| 19 | void cleanup_tc(struct tc *tc) |
| 20 | { |
| 21 | |
| 22 | } |
| 23 | |
| 24 | static 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 | } |
| 38 | static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill); |
| 39 | |
| 40 | static 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 | |
| 48 | static 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 | } |
| 67 | static DEVICE_ATTR_RW(ntcs); |
| 68 | |
| 69 | static struct attribute *vpe_attrs[] = { |
| 70 | &dev_attr_kill.attr, |
| 71 | &dev_attr_ntcs.attr, |
| 72 | NULL, |
| 73 | }; |
| 74 | ATTRIBUTE_GROUPS(vpe); |
| 75 | |
| 76 | static void vpe_device_release(struct device *cd) |
| 77 | { |
| 78 | kfree(cd); |
| 79 | } |
| 80 | |
| 81 | static struct class vpe_class = { |
| 82 | .name = "vpe", |
| 83 | .owner = THIS_MODULE, |
| 84 | .dev_release = vpe_device_release, |
| 85 | .dev_groups = vpe_groups, |
| 86 | }; |
| 87 | |
| 88 | static struct device vpe_device; |
| 89 | |
| 90 | int __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 | |
| 156 | out_dev: |
| 157 | device_del(&vpe_device); |
| 158 | |
| 159 | out_class: |
| 160 | class_unregister(&vpe_class); |
| 161 | |
| 162 | out_chrdev: |
| 163 | unregister_chrdev(major, VPE_MODULE_NAME); |
| 164 | |
| 165 | return err; |
| 166 | } |
| 167 | |
| 168 | void __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 | } |