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// SPDX-License-Identifier: GPL-2.0
/*
* GXP support for DMA fence.
*
* Copyright (C) 2023 Google LLC
*/
#include <linux/slab.h>
#include <gcip/gcip-dma-fence.h>
#include "gxp-dma-fence.h"
#include "gxp-internal.h"
#include "gxp-vd.h"
#include "gxp.h"
static const char *gxp_get_driver_name(struct dma_fence *fence)
{
return GXP_NAME;
}
static void gxp_dma_fence_release(struct dma_fence *fence)
{
struct gxp_dma_fence *gxp_fence = to_gxp_fence(fence);
gcip_dma_fence_exit(&gxp_fence->gfence);
kfree(gxp_fence);
}
static const struct dma_fence_ops gxp_dma_fence_ops = {
.get_driver_name = gxp_get_driver_name,
.get_timeline_name = gcip_dma_fence_get_timeline_name,
.wait = dma_fence_default_wait,
.enable_signaling = gcip_dma_fence_always_true,
.release = gxp_dma_fence_release,
};
int gxp_dma_fence_create(struct gxp_dev *gxp, struct gxp_virtual_device *vd,
struct gxp_create_sync_fence_data *datap)
{
struct gcip_dma_fence_data data = {
.timeline_name = datap->timeline_name,
.ops = &gxp_dma_fence_ops,
.seqno = datap->seqno,
};
struct gxp_dma_fence *gxp_fence =
kzalloc(sizeof(*gxp_fence), GFP_KERNEL);
int ret;
if (!gxp_fence)
return -ENOMEM;
/* TODO(b/264855736): add VD association support */
ret = gcip_dma_fence_init(gxp->gfence_mgr, &gxp_fence->gfence, &data);
if (!ret)
datap->fence = data.fence;
/*
* We don't need to kfree(gxp_fence) on error because that's called in
* gxp_dma_fence_release.
*/
return ret;
}
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