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