2311720a01
And while we are at it, let's start the fence counter close to the
rollover point so that if issues slip in, they are more obvious.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Fixes: fde5de6cb461 ("drm/msm: move fence code to it's own file")
Fixes: 5f3aee4ceb5b ("drm/msm: Handle fence rollover")
Patchwork: https://patchwork.freedesktop.org/patch/489619/
Link: https://lore.kernel.org/r/20220615162435.3011793-1-robdclark@gmail.com
[DB: fixed the conflict while applying the patch]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/dma-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, volatile uint32_t *fenceptr,
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const char *name)
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{
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struct msm_fence_context *fctx;
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static int index = 0;
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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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strncpy(fctx->name, name, sizeof(fctx->name));
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fctx->context = dma_fence_context_alloc(1);
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fctx->index = index++;
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fctx->fenceptr = fenceptr;
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spin_lock_init(&fctx->spinlock);
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/*
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* Start out close to the 32b fence rollover point, so we can
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* catch bugs with fence comparisons.
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*/
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fctx->last_fence = 0xffffff00;
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fctx->completed_fence = fctx->last_fence;
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*fctx->fenceptr = fctx->last_fence;
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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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bool msm_fence_completed(struct msm_fence_context *fctx, uint32_t fence)
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{
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/*
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* Note: Check completed_fence first, as fenceptr is in a write-combine
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* mapping, so it will be more expensive to read.
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*/
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return (int32_t)(fctx->completed_fence - fence) >= 0 ||
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(int32_t)(*fctx->fenceptr - fence) >= 0;
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}
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/* called from irq handler and workqueue (in recover path) */
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void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence)
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{
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unsigned long flags;
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spin_lock_irqsave(&fctx->spinlock, flags);
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if (fence_after(fence, fctx->completed_fence))
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fctx->completed_fence = fence;
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spin_unlock_irqrestore(&fctx->spinlock, flags);
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}
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struct msm_fence {
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struct dma_fence base;
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struct msm_fence_context *fctx;
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};
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static inline struct msm_fence *to_msm_fence(struct dma_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 dma_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 dma_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_signaled(struct dma_fence *fence)
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{
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struct msm_fence *f = to_msm_fence(fence);
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return msm_fence_completed(f->fctx, f->base.seqno);
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}
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static const struct dma_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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.signaled = msm_fence_signaled,
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};
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struct dma_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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dma_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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