radeon_semaphore.c

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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 <[email protected]>
 */
#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;
}