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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013-2016 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <linux/dma-fence.h>
#include "msm_drv.h"
#include "msm_fence.h"
struct msm_fence_context *
msm_fence_context_alloc(struct drm_device *dev, volatile uint32_t *fenceptr,
const char *name)
{
struct msm_fence_context *fctx;
static int index = 0;
fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
if (!fctx)
return ERR_PTR(-ENOMEM);
fctx->dev = dev;
strncpy(fctx->name, name, sizeof(fctx->name));
fctx->context = dma_fence_context_alloc(1);
fctx->index = index++;
fctx->fenceptr = fenceptr;
spin_lock_init(&fctx->spinlock);
/*
* Start out close to the 32b fence rollover point, so we can
* catch bugs with fence comparisons.
*/
fctx->last_fence = 0xffffff00;
fctx->completed_fence = fctx->last_fence;
*fctx->fenceptr = fctx->last_fence;
return fctx;
}
void msm_fence_context_free(struct msm_fence_context *fctx)
{
kfree(fctx);
}
bool msm_fence_completed(struct msm_fence_context *fctx, uint32_t fence)
{
/*
* Note: Check completed_fence first, as fenceptr is in a write-combine
* mapping, so it will be more expensive to read.
*/
return (int32_t)(fctx->completed_fence - fence) >= 0 ||
(int32_t)(*fctx->fenceptr - fence) >= 0;
}
/* called from irq handler and workqueue (in recover path) */
void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence)
{
unsigned long flags;
spin_lock_irqsave(&fctx->spinlock, flags);
if (fence_after(fence, fctx->completed_fence))
fctx->completed_fence = fence;
spin_unlock_irqrestore(&fctx->spinlock, flags);
}
struct msm_fence {
struct dma_fence base;
struct msm_fence_context *fctx;
};
static inline struct msm_fence *to_msm_fence(struct dma_fence *fence)
{
return container_of(fence, struct msm_fence, base);
}
static const char *msm_fence_get_driver_name(struct dma_fence *fence)
{
return "msm";
}
static const char *msm_fence_get_timeline_name(struct dma_fence *fence)
{
struct msm_fence *f = to_msm_fence(fence);
return f->fctx->name;
}
static bool msm_fence_signaled(struct dma_fence *fence)
{
struct msm_fence *f = to_msm_fence(fence);
return msm_fence_completed(f->fctx, f->base.seqno);
}
static const struct dma_fence_ops msm_fence_ops = {
.get_driver_name = msm_fence_get_driver_name,
.get_timeline_name = msm_fence_get_timeline_name,
.signaled = msm_fence_signaled,
};
struct dma_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;
dma_fence_init(&f->base, &msm_fence_ops, &fctx->spinlock,
fctx->context, ++fctx->last_fence);
return &f->base;
}
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