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Diffstat (limited to 'drivers/gpu/drm/msm/msm_fence.c')
-rw-r--r--drivers/gpu/drm/msm/msm_fence.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_fence.c b/drivers/gpu/drm/msm/msm_fence.c
new file mode 100644
index 000000000..56641408e
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_fence.c
@@ -0,0 +1,116 @@
+// 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;
+ strscpy(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;
+}