1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/file.h>
3 #include <linux/fs.h>
4 #include <linux/export.h>
5 #include <linux/mount.h>
6 #include <linux/namei.h>
7 #include <linux/slab.h>
8
9 #include <linux/uaccess.h>
10
11 #include "spufs.h"
12
13 /**
14 * sys_spu_run - run code loaded into an SPU
15 *
16 * @unpc: next program counter for the SPU
17 * @ustatus: status of the SPU
18 *
19 * This system call transfers the control of execution of a
20 * user space thread to an SPU. It will return when the
21 * SPU has finished executing or when it hits an error
22 * condition and it will be interrupted if a signal needs
23 * to be delivered to a handler in user space.
24 *
25 * The next program counter is set to the passed value
26 * before the SPU starts fetching code and the user space
27 * pointer gets updated with the new value when returning
28 * from kernel space.
29 *
30 * The status value returned from spu_run reflects the
31 * value of the spu_status register after the SPU has stopped.
32 *
33 */
34 static long do_spu_run(struct file *filp,
35 __u32 __user *unpc,
36 __u32 __user *ustatus)
37 {
38 long ret;
39 struct spufs_inode_info *i;
40 u32 npc, status;
41
42 ret = -EFAULT;
43 if (get_user(npc, unpc))
44 goto out;
45
46 /* check if this file was created by spu_create */
47 ret = -EINVAL;
48 if (filp->f_op != &spufs_context_fops)
49 goto out;
50
51 i = SPUFS_I(file_inode(filp));
52 ret = spufs_run_spu(i->i_ctx, &npc, &status);
53
54 if (put_user(npc, unpc))
55 ret = -EFAULT;
56
57 if (ustatus && put_user(status, ustatus))
58 ret = -EFAULT;
59 out:
60 return ret;
61 }
62
63 static long do_spu_create(const char __user *pathname, unsigned int flags,
64 umode_t mode, struct file *neighbor)
65 {
66 struct path path;
67 struct dentry *dentry;
68 int ret;
69
70 dentry = user_path_create(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY);
71 ret = PTR_ERR(dentry);
72 if (!IS_ERR(dentry)) {
73 ret = spufs_create(&path, dentry, flags, mode, neighbor);
74 done_path_create(&path, dentry);
75 }
76
77 return ret;
78 }
79
80 struct spufs_calls spufs_calls = {
81 .create_thread = do_spu_create,
82 .spu_run = do_spu_run,
83 .notify_spus_active = do_notify_spus_active,
84 .owner = THIS_MODULE,
85 #ifdef CONFIG_COREDUMP
86 .coredump_extra_notes_size = spufs_coredump_extra_notes_size,
87 .coredump_extra_notes_write = spufs_coredump_extra_notes_write,
88 #endif
89 };
90
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