181 lines
3.6 KiB
C
181 lines
3.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <asm/vpe.h>
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static int major;
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void cleanup_tc(struct tc *tc)
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{
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}
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static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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struct vpe_notifications *notifier;
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list_for_each_entry(notifier, &vpe->notify, list)
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notifier->stop(aprp_cpu_index());
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release_progmem(vpe->load_addr);
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vpe->state = VPE_STATE_UNUSED;
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return len;
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}
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static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
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static ssize_t ntcs_show(struct device *cd, struct device_attribute *attr,
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char *buf)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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return sprintf(buf, "%d\n", vpe->ntcs);
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}
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static ssize_t ntcs_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct vpe *vpe = get_vpe(aprp_cpu_index());
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unsigned long new;
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int ret;
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ret = kstrtoul(buf, 0, &new);
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if (ret < 0)
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return ret;
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/* APRP can only reserve one TC in a VPE and no more. */
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if (new != 1)
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return -EINVAL;
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vpe->ntcs = new;
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return len;
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}
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static DEVICE_ATTR_RW(ntcs);
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static struct attribute *vpe_attrs[] = {
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&dev_attr_kill.attr,
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&dev_attr_ntcs.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(vpe);
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static void vpe_device_release(struct device *cd)
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{
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kfree(cd);
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}
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static struct class vpe_class = {
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.name = "vpe",
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.owner = THIS_MODULE,
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.dev_release = vpe_device_release,
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.dev_groups = vpe_groups,
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};
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static struct device vpe_device;
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int __init vpe_module_init(void)
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{
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struct vpe *v = NULL;
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struct tc *t;
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int err;
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if (!cpu_has_mipsmt) {
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pr_warn("VPE loader: not a MIPS MT capable processor\n");
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return -ENODEV;
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}
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if (num_possible_cpus() - aprp_cpu_index() < 1) {
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pr_warn("No VPEs reserved for AP/SP, not initialize VPE loader\n"
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"Pass maxcpus=<n> argument as kernel argument\n");
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return -ENODEV;
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}
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major = register_chrdev(0, VPE_MODULE_NAME, &vpe_fops);
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if (major < 0) {
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pr_warn("VPE loader: unable to register character device\n");
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return major;
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}
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err = class_register(&vpe_class);
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if (err) {
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pr_err("vpe_class registration failed\n");
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goto out_chrdev;
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}
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device_initialize(&vpe_device);
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vpe_device.class = &vpe_class,
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vpe_device.parent = NULL,
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dev_set_name(&vpe_device, "vpe_sp");
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vpe_device.devt = MKDEV(major, VPE_MODULE_MINOR);
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err = device_add(&vpe_device);
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if (err) {
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pr_err("Adding vpe_device failed\n");
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goto out_class;
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}
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t = alloc_tc(aprp_cpu_index());
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if (!t) {
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pr_warn("VPE: unable to allocate TC\n");
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err = -ENOMEM;
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goto out_dev;
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}
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/* VPE */
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v = alloc_vpe(aprp_cpu_index());
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if (v == NULL) {
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pr_warn("VPE: unable to allocate VPE\n");
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kfree(t);
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err = -ENOMEM;
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goto out_dev;
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}
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v->ntcs = 1;
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/* add the tc to the list of this vpe's tc's. */
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list_add(&t->tc, &v->tc);
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/* TC */
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t->pvpe = v; /* set the parent vpe */
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return 0;
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out_dev:
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device_del(&vpe_device);
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out_class:
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class_unregister(&vpe_class);
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out_chrdev:
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unregister_chrdev(major, VPE_MODULE_NAME);
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return err;
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}
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void __exit vpe_module_exit(void)
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{
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struct vpe *v, *n;
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device_del(&vpe_device);
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class_unregister(&vpe_class);
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unregister_chrdev(major, VPE_MODULE_NAME);
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/* No locking needed here */
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list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list)
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if (v->state != VPE_STATE_UNUSED)
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release_vpe(v);
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}
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