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 */
do_spu_run(struct file * filp,__u32 __user * unpc,__u32 __user * ustatus)33 static 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(filp->f_path.dentry->d_inode);
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;
58 out:
59 return ret;
60 }
61
do_spu_create(const char __user * pathname,unsigned int flags,umode_t mode,struct file * neighbor)62 static 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, 1);
70 ret = PTR_ERR(dentry);
71 if (!IS_ERR(dentry)) {
72 ret = spufs_create(&path, dentry, flags, mode, neighbor);
73 path_put(&path);
74 }
75
76 return ret;
77 }
78
79 struct spufs_calls spufs_calls = {
80 .create_thread = do_spu_create,
81 .spu_run = do_spu_run,
82 .coredump_extra_notes_size = spufs_coredump_extra_notes_size,
83 .coredump_extra_notes_write = spufs_coredump_extra_notes_write,
84 .notify_spus_active = do_notify_spus_active,
85 .owner = THIS_MODULE,
86 };
87