drivers/misc/mediatek/gpu/mt8127/mali/ump/linux/ump_ukk_ref_wrappers.c

   1 /*
   2  * This confidential and proprietary software may be used only as
   3  * authorised by a licensing agreement from ARM Limited
   4  * (C) COPYRIGHT 2009-2010, 2013-2015 ARM Limited
   5  * ALL RIGHTS RESERVED
   6  * The entire notice above must be reproduced on all authorised
   7  * copies and copies may only be made to the extent permitted
   8  * by a licensing agreement from ARM Limited.
   9  */
  10
  11 /**
  12  * @file ump_ukk_wrappers.c
  13  * Defines the wrapper functions which turn Linux IOCTL calls into _ukk_ calls for the reference implementation
  14  */
  15
  16
  17 #include <asm/uaccess.h>             /* user space access */
  18
  19 #include "ump_osk.h"
  20 #include "ump_uk_types.h"
  21 #include "ump_ukk.h"
  22 #include "ump_kernel_common.h"
  23
  24 /*
  25  * IOCTL operation; Allocate UMP memory
  26  */
  27 int ump_allocate_wrapper(u32 __user *argument, struct ump_session_data   *session_data)
  28 {
  29         _ump_uk_allocate_s user_interaction;
  30         _mali_osk_errcode_t err;
  31
  32         /* Sanity check input parameters */
  33         if (NULL == argument || NULL == session_data) {
  34                 MSG_ERR(("NULL parameter in ump_ioctl_allocate()\n"));
  35                 return -ENOTTY;
  36         }
  37
  38         /* Copy the user space memory to kernel space (so we safely can read it) */
  39         if (0 != copy_from_user(&user_interaction, argument, sizeof(user_interaction))) {
  40                 MSG_ERR(("copy_from_user() in ump_ioctl_allocate()\n"));
  41                 return -EFAULT;
  42         }
  43
  44         user_interaction.ctx = (void *) session_data;
  45
  46         err = _ump_ukk_allocate(&user_interaction);
  47         if (_MALI_OSK_ERR_OK != err) {
  48                 DBG_MSG(1, ("_ump_ukk_allocate() failed in ump_ioctl_allocate()\n"));
  49                 return map_errcode(err);
  50         }
  51         user_interaction.ctx = NULL;
  52
  53         if (0 != copy_to_user(argument, &user_interaction, sizeof(user_interaction))) {
  54                 /* If the copy fails then we should release the memory. We can use the IOCTL release to accomplish this */
  55                 _ump_uk_release_s release_args;
  56
  57                 MSG_ERR(("copy_to_user() failed in ump_ioctl_allocate()\n"));
  58
  59                 release_args.ctx = (void *) session_data;
  60                 release_args.secure_id = user_interaction.secure_id;
  61
  62                 err = _ump_ukk_release(&release_args);
  63                 if (_MALI_OSK_ERR_OK != err) {
  64                         MSG_ERR(("_ump_ukk_release() also failed when trying to release newly allocated memory in ump_ioctl_allocate()\n"));
  65                 }
  66
  67                 return -EFAULT;
  68         }
  69
  70         return 0; /* success */
  71 }