LXR linux/arch/powerpc/platforms/cell/spufs/syscalls.c

   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        .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