1#include <linux/file.h>
2#include <linux/fs.h>
3#include <linux/export.h>
4#include <linux/mount.h>
5#include <linux/namei.h>
6#include <linux/slab.h>
7
8#include <asm/uaccess.h>
9
10#include "spufs.h"
11
12/**
13 * sys_spu_run - run code loaded into an SPU
14 *
15 * @unpc:    next program counter for the SPU
16 * @ustatus: status of the SPU
17 *
18 * This system call transfers the control of execution of a
19 * user space thread to an SPU. It will return when the
20 * SPU has finished executing or when it hits an error
21 * condition and it will be interrupted if a signal needs
22 * to be delivered to a handler in user space.
23 *
24 * The next program counter is set to the passed value
25 * before the SPU starts fetching code and the user space
26 * pointer gets updated with the new value when returning
27 * from kernel space.
28 *
29 * The status value returned from spu_run reflects the
30 * value of the spu_status register after the SPU has stopped.
31 *
32 */
33static long do_spu_run(struct file *filp,
34			__u32 __user *unpc,
35			__u32 __user *ustatus)
36{
37	long ret;
38	struct spufs_inode_info *i;
39	u32 npc, status;
40
41	ret = -EFAULT;
42	if (get_user(npc, unpc))
43		goto out;
44
45	/* check if this file was created by spu_create */
46	ret = -EINVAL;
47	if (filp->f_op != &spufs_context_fops)
48		goto out;
49
50	i = SPUFS_I(file_inode(filp));
51	ret = spufs_run_spu(i->i_ctx, &npc, &status);
52
53	if (put_user(npc, unpc))
54		ret = -EFAULT;
55
56	if (ustatus && put_user(status, ustatus))
57		ret = -EFAULT;
58out:
59	return ret;
60}
61
62static long do_spu_create(const char __user *pathname, unsigned int flags,
63		umode_t mode, struct file *neighbor)
64{
65	struct path path;
66	struct dentry *dentry;
67	int ret;
68
69	dentry = user_path_create(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY);
70	ret = PTR_ERR(dentry);
71	if (!IS_ERR(dentry)) {
72		ret = spufs_create(&path, dentry, flags, mode, neighbor);
73		done_path_create(&path, dentry);
74	}
75
76	return ret;
77}
78
79struct spufs_calls spufs_calls = {
80	.create_thread = do_spu_create,
81	.spu_run = do_spu_run,
82	.notify_spus_active = do_notify_spus_active,
83	.owner = THIS_MODULE,
84#ifdef CONFIG_COREDUMP
85	.coredump_extra_notes_size = spufs_coredump_extra_notes_size,
86	.coredump_extra_notes_write = spufs_coredump_extra_notes_write,
87#endif
88};
89