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