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