Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 1 | #include <linux/file.h> |
| 2 | #include <linux/fs.h> |
| 3 | #include <linux/module.h> |
| 4 | #include <linux/mount.h> |
| 5 | #include <linux/namei.h> |
| 6 | |
| 7 | #include <asm/uaccess.h> |
| 8 | |
| 9 | #include "spufs.h" |
| 10 | |
| 11 | /** |
| 12 | * sys_spu_run - run code loaded into an SPU |
| 13 | * |
| 14 | * @unpc: next program counter for the SPU |
| 15 | * @ustatus: status of the SPU |
| 16 | * |
| 17 | * This system call transfers the control of execution of a |
| 18 | * user space thread to an SPU. It will return when the |
| 19 | * SPU has finished executing or when it hits an error |
| 20 | * condition and it will be interrupted if a signal needs |
| 21 | * to be delivered to a handler in user space. |
| 22 | * |
| 23 | * The next program counter is set to the passed value |
| 24 | * before the SPU starts fetching code and the user space |
| 25 | * pointer gets updated with the new value when returning |
| 26 | * from kernel space. |
| 27 | * |
| 28 | * The status value returned from spu_run reflects the |
| 29 | * value of the spu_status register after the SPU has stopped. |
| 30 | * |
| 31 | */ |
Arnd Bergmann | 8fce10a | 2006-01-11 23:07:11 +0000 | [diff] [blame] | 32 | static long do_spu_run(struct file *filp, |
| 33 | __u32 __user *unpc, |
| 34 | __u32 __user *ustatus) |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 35 | { |
| 36 | long ret; |
| 37 | struct spufs_inode_info *i; |
| 38 | u32 npc, status; |
| 39 | |
| 40 | ret = -EFAULT; |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 41 | if (get_user(npc, unpc) || get_user(status, ustatus)) |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 42 | goto out; |
| 43 | |
Arnd Bergmann | e80358a | 2006-01-04 20:31:23 +0100 | [diff] [blame] | 44 | /* check if this file was created by spu_create */ |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 45 | ret = -EINVAL; |
Arnd Bergmann | e80358a | 2006-01-04 20:31:23 +0100 | [diff] [blame] | 46 | if (filp->f_op != &spufs_context_fops) |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 47 | goto out; |
| 48 | |
| 49 | i = SPUFS_I(filp->f_dentry->d_inode); |
| 50 | ret = spufs_run_spu(filp, i->i_ctx, &npc, &status); |
| 51 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 52 | if (put_user(npc, unpc) || put_user(status, ustatus)) |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 53 | ret = -EFAULT; |
| 54 | out: |
| 55 | return ret; |
| 56 | } |
| 57 | |
| 58 | #ifndef MODULE |
| 59 | asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus) |
| 60 | { |
| 61 | int fput_needed; |
| 62 | struct file *filp; |
| 63 | long ret; |
| 64 | |
| 65 | ret = -EBADF; |
| 66 | filp = fget_light(fd, &fput_needed); |
| 67 | if (filp) { |
| 68 | ret = do_spu_run(filp, unpc, ustatus); |
| 69 | fput_light(filp, fput_needed); |
| 70 | } |
| 71 | |
| 72 | return ret; |
| 73 | } |
| 74 | #endif |
| 75 | |
| 76 | asmlinkage long sys_spu_create(const char __user *pathname, |
| 77 | unsigned int flags, mode_t mode) |
| 78 | { |
| 79 | char *tmp; |
| 80 | int ret; |
| 81 | |
| 82 | tmp = getname(pathname); |
| 83 | ret = PTR_ERR(tmp); |
| 84 | if (!IS_ERR(tmp)) { |
| 85 | struct nameidata nd; |
| 86 | |
| 87 | ret = path_lookup(tmp, LOOKUP_PARENT| |
| 88 | LOOKUP_OPEN|LOOKUP_CREATE, &nd); |
| 89 | if (!ret) { |
Arnd Bergmann | 6ff730c | 2006-01-04 20:31:31 +0100 | [diff] [blame] | 90 | ret = spufs_create_thread(&nd, flags, mode); |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 91 | path_release(&nd); |
| 92 | } |
| 93 | putname(tmp); |
| 94 | } |
| 95 | |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | struct spufs_calls spufs_calls = { |
| 100 | .create_thread = sys_spu_create, |
| 101 | .spu_run = do_spu_run, |
| 102 | .owner = THIS_MODULE, |
| 103 | }; |