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/*
* Copyright (C) 2010, 2012 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/fs.h> /* file system operations */
#include <asm/uaccess.h> /* user space access */
#include "mali_ukk.h"
#include "mali_osk.h"
#include "mali_kernel_common.h"
#include "mali_session.h"
#include "mali_ukk_wrappers.h"
int gp_start_job_wrapper(struct mali_session_data *session_data, _mali_uk_gp_start_job_s __user *uargs)
{
_mali_uk_gp_start_job_s kargs;
_mali_osk_errcode_t err;
MALI_CHECK_NON_NULL(uargs, -EINVAL);
MALI_CHECK_NON_NULL(session_data, -EINVAL);
if (!access_ok(VERIFY_WRITE, uargs, sizeof(_mali_uk_gp_start_job_s)))
{
return -EFAULT;
}
if (0 != copy_from_user(&kargs, uargs, sizeof(_mali_uk_gp_start_job_s))) return -EFAULT;
kargs.ctx = session_data;
err = _mali_ukk_gp_start_job(&kargs);
if (_MALI_OSK_ERR_OK != err) return map_errcode(err);
kargs.ctx = NULL; /* prevent kernel address to be returned to user space */
if (0 != copy_to_user(uargs, &kargs, sizeof(_mali_uk_gp_start_job_s)))
{
/*
* If this happens, then user space will not know that the job was actually started,
* and if we return a queued job, then user space will still think that one is still queued.
* This will typically lead to a deadlock in user space.
* This could however only happen if user space deliberately passes a user buffer which
* passes the access_ok(VERIFY_WRITE) check, but isn't fully writable at the time of copy_to_user().
* The official Mali driver will never attempt to do that, and kernel space should not be affected.
* That is why we do not bother to do a complex rollback in this very very very rare case.
*/
return -EFAULT;
}
return 0;
}
int gp_get_core_version_wrapper(struct mali_session_data *session_data, _mali_uk_get_gp_core_version_s __user *uargs)
{
_mali_uk_get_gp_core_version_s kargs;
_mali_osk_errcode_t err;
MALI_CHECK_NON_NULL(uargs, -EINVAL);
MALI_CHECK_NON_NULL(session_data, -EINVAL);
kargs.ctx = session_data;
err = _mali_ukk_get_gp_core_version(&kargs);
if (_MALI_OSK_ERR_OK != err) return map_errcode(err);
/* no known transactions to roll-back */
if (0 != put_user(kargs.version, &uargs->version)) return -EFAULT;
return 0;
}
int gp_suspend_response_wrapper(struct mali_session_data *session_data, _mali_uk_gp_suspend_response_s __user *uargs)
{
_mali_uk_gp_suspend_response_s kargs;
_mali_osk_errcode_t err;
MALI_CHECK_NON_NULL(uargs, -EINVAL);
MALI_CHECK_NON_NULL(session_data, -EINVAL);
if (0 != copy_from_user(&kargs, uargs, sizeof(_mali_uk_gp_suspend_response_s))) return -EFAULT;
kargs.ctx = session_data;
err = _mali_ukk_gp_suspend_response(&kargs);
if (_MALI_OSK_ERR_OK != err) return map_errcode(err);
if (0 != put_user(kargs.cookie, &uargs->cookie)) return -EFAULT;
/* no known transactions to roll-back */
return 0;
}
int gp_get_number_of_cores_wrapper(struct mali_session_data *session_data, _mali_uk_get_gp_number_of_cores_s __user *uargs)
{
_mali_uk_get_gp_number_of_cores_s kargs;
_mali_osk_errcode_t err;
MALI_CHECK_NON_NULL(uargs, -EINVAL);
MALI_CHECK_NON_NULL(session_data, -EINVAL);
kargs.ctx = session_data;
err = _mali_ukk_get_gp_number_of_cores(&kargs);
if (_MALI_OSK_ERR_OK != err) return map_errcode(err);
/* no known transactions to roll-back */
if (0 != put_user(kargs.number_of_cores, &uargs->number_of_cores)) return -EFAULT;
return 0;
}
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