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163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/*
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* Copyright (C) 2013-2016 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/fence.h>
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#include "msm_drv.h"
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#include "msm_fence.h"
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struct msm_fence_context *
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msm_fence_context_alloc(struct drm_device *dev, const char *name)
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{
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struct msm_fence_context *fctx;
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fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
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if (!fctx)
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return ERR_PTR(-ENOMEM);
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fctx->dev = dev;
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fctx->name = name;
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fctx->context = fence_context_alloc(1);
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init_waitqueue_head(&fctx->event);
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spin_lock_init(&fctx->spinlock);
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return fctx;
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}
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void msm_fence_context_free(struct msm_fence_context *fctx)
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{
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kfree(fctx);
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}
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static inline bool fence_completed(struct msm_fence_context *fctx, uint32_t fence)
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{
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return (int32_t)(fctx->completed_fence - fence) >= 0;
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}
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/* legacy path for WAIT_FENCE ioctl: */
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int msm_wait_fence(struct msm_fence_context *fctx, uint32_t fence,
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ktime_t *timeout, bool interruptible)
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{
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int ret;
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if (fence > fctx->last_fence) {
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DRM_ERROR("%s: waiting on invalid fence: %u (of %u)\n",
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fctx->name, fence, fctx->last_fence);
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return -EINVAL;
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}
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if (!timeout) {
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/* no-wait: */
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ret = fence_completed(fctx, fence) ? 0 : -EBUSY;
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} else {
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unsigned long remaining_jiffies = timeout_to_jiffies(timeout);
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if (interruptible)
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ret = wait_event_interruptible_timeout(fctx->event,
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fence_completed(fctx, fence),
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remaining_jiffies);
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else
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ret = wait_event_timeout(fctx->event,
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fence_completed(fctx, fence),
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remaining_jiffies);
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if (ret == 0) {
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DBG("timeout waiting for fence: %u (completed: %u)",
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fence, fctx->completed_fence);
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ret = -ETIMEDOUT;
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} else if (ret != -ERESTARTSYS) {
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ret = 0;
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}
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}
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return ret;
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}
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/* called from workqueue */
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void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence)
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{
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spin_lock(&fctx->spinlock);
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fctx->completed_fence = max(fence, fctx->completed_fence);
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spin_unlock(&fctx->spinlock);
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wake_up_all(&fctx->event);
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}
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struct msm_fence {
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struct msm_fence_context *fctx;
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struct fence base;
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};
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static inline struct msm_fence *to_msm_fence(struct fence *fence)
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{
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return container_of(fence, struct msm_fence, base);
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}
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static const char *msm_fence_get_driver_name(struct fence *fence)
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{
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return "msm";
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}
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static const char *msm_fence_get_timeline_name(struct fence *fence)
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{
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struct msm_fence *f = to_msm_fence(fence);
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return f->fctx->name;
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}
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static bool msm_fence_enable_signaling(struct fence *fence)
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{
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return true;
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}
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static bool msm_fence_signaled(struct fence *fence)
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{
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struct msm_fence *f = to_msm_fence(fence);
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return fence_completed(f->fctx, f->base.seqno);
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}
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static void msm_fence_release(struct fence *fence)
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{
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struct msm_fence *f = to_msm_fence(fence);
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kfree_rcu(f, base.rcu);
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}
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static const struct fence_ops msm_fence_ops = {
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.get_driver_name = msm_fence_get_driver_name,
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.get_timeline_name = msm_fence_get_timeline_name,
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.enable_signaling = msm_fence_enable_signaling,
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.signaled = msm_fence_signaled,
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.wait = fence_default_wait,
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.release = msm_fence_release,
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};
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struct fence *
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msm_fence_alloc(struct msm_fence_context *fctx)
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{
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struct msm_fence *f;
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f = kzalloc(sizeof(*f), GFP_KERNEL);
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if (!f)
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return ERR_PTR(-ENOMEM);
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f->fctx = fctx;
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fence_init(&f->base, &msm_fence_ops, &fctx->spinlock,
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fctx->context, ++fctx->last_fence);
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return &f->base;
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}
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