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/*
* Copyright 2011 Christian König.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors:
* Christian König <deathsimple@vodafone.de>
*/
#include <drm/drmP.h>
#include "radeon.h"
int radeon_semaphore_create(struct radeon_device *rdev,
struct radeon_semaphore **semaphore)
{
int r;
*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
if (*semaphore == NULL) {
return -ENOMEM;
}
r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
&(*semaphore)->sa_bo, 8, 8, true);
if (r) {
kfree(*semaphore);
*semaphore = NULL;
return r;
}
(*semaphore)->waiters = 0;
(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
*((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
return 0;
}
void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
struct radeon_semaphore *semaphore)
{
--semaphore->waiters;
radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
}
void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
struct radeon_semaphore *semaphore)
{
++semaphore->waiters;
radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
}
/* caller must hold ring lock */
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
int signaler, int waiter)
{
int r;
/* no need to signal and wait on the same ring */
if (signaler == waiter) {
return 0;
}
/* prevent GPU deadlocks */
if (!rdev->ring[signaler].ready) {
dev_err(rdev->dev, "Trying to sync to a disabled ring!");
return -EINVAL;
}
r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
if (r) {
return r;
}
radeon_semaphore_emit_signal(rdev, signaler, semaphore);
radeon_ring_commit(rdev, &rdev->ring[signaler]);
/* we assume caller has already allocated space on waiters ring */
radeon_semaphore_emit_wait(rdev, waiter, semaphore);
return 0;
}
void radeon_semaphore_free(struct radeon_device *rdev,
struct radeon_semaphore **semaphore,
struct radeon_fence *fence)
{
if (semaphore == NULL || *semaphore == NULL) {
return;
}
if ((*semaphore)->waiters > 0) {
dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
" hardware lockup imminent!\n", *semaphore);
}
radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
kfree(*semaphore);
*semaphore = NULL;
}
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