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@@ -0,0 +1,283 @@
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+/*
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+ * Copyright 2016 Intel Corporation
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software")
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+ * to deal in the software without restriction, including without limitation
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+ * on the rights to use, copy, modify, merge, publish, distribute, sub
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+ * license, and/or sell copies of the Software, and to permit persons to whom
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+ * them Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice (including the next
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+ * paragraph) shall be included in all copies or substantial portions of the
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+ * Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
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+ * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
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+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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+ */
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+
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+#include <linux/dma-buf.h>
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+#include <linux/reservation.h>
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+
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+#include "vgem_drv.h"
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+
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+#define VGEM_FENCE_TIMEOUT (10*HZ)
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+
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+struct vgem_fence {
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+ struct fence base;
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+ struct spinlock lock;
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+ struct timer_list timer;
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+};
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+
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+static const char *vgem_fence_get_driver_name(struct fence *fence)
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+{
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+ return "vgem";
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+}
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+
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+static const char *vgem_fence_get_timeline_name(struct fence *fence)
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+{
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+ return "unbound";
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+}
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+
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+static bool vgem_fence_signaled(struct fence *fence)
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+{
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+ return false;
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+}
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+
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+static bool vgem_fence_enable_signaling(struct fence *fence)
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+{
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+ return true;
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+}
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+
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+static void vgem_fence_release(struct fence *base)
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+{
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+ struct vgem_fence *fence = container_of(base, typeof(*fence), base);
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+
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+ del_timer_sync(&fence->timer);
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+ fence_free(&fence->base);
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+}
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+
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+static void vgem_fence_value_str(struct fence *fence, char *str, int size)
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+{
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+ snprintf(str, size, "%u", fence->seqno);
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+}
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+
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+static void vgem_fence_timeline_value_str(struct fence *fence, char *str,
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+ int size)
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+{
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+ snprintf(str, size, "%u", fence_is_signaled(fence) ? fence->seqno : 0);
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+}
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+
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+const struct fence_ops vgem_fence_ops = {
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+ .get_driver_name = vgem_fence_get_driver_name,
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+ .get_timeline_name = vgem_fence_get_timeline_name,
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+ .enable_signaling = vgem_fence_enable_signaling,
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+ .signaled = vgem_fence_signaled,
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+ .wait = fence_default_wait,
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+ .release = vgem_fence_release,
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+
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+ .fence_value_str = vgem_fence_value_str,
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+ .timeline_value_str = vgem_fence_timeline_value_str,
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+};
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+
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+static void vgem_fence_timeout(unsigned long data)
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+{
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+ struct vgem_fence *fence = (struct vgem_fence *)data;
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+
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+ fence_signal(&fence->base);
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+}
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+
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+static struct fence *vgem_fence_create(struct vgem_file *vfile,
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+ unsigned int flags)
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+{
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+ struct vgem_fence *fence;
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+
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+ fence = kzalloc(sizeof(*fence), GFP_KERNEL);
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+ if (!fence)
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+ return NULL;
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+
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+ spin_lock_init(&fence->lock);
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+ fence_init(&fence->base, &vgem_fence_ops, &fence->lock,
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+ fence_context_alloc(1), 1);
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+
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+ setup_timer(&fence->timer, vgem_fence_timeout, (unsigned long)fence);
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+
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+ /* We force the fence to expire within 10s to prevent driver hangs */
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+ mod_timer(&fence->timer, VGEM_FENCE_TIMEOUT);
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+
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+ return &fence->base;
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+}
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+
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+static int attach_dmabuf(struct drm_device *dev,
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+ struct drm_gem_object *obj)
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+{
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+ struct dma_buf *dmabuf;
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+
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+ if (obj->dma_buf)
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+ return 0;
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+
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+ dmabuf = dev->driver->gem_prime_export(dev, obj, 0);
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+ if (IS_ERR(dmabuf))
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+ return PTR_ERR(dmabuf);
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+
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+ obj->dma_buf = dmabuf;
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+ drm_gem_object_reference(obj);
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+ return 0;
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+}
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+
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+/*
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+ * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH):
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+ *
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+ * Create and attach a fence to the vGEM handle. This fence is then exposed
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+ * via the dma-buf reservation object and visible to consumers of the exported
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+ * dma-buf. If the flags contain VGEM_FENCE_WRITE, the fence indicates the
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+ * vGEM buffer is being written to by the client and is exposed as an exclusive
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+ * fence, otherwise the fence indicates the client is current reading from the
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+ * buffer and all future writes should wait for the client to signal its
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+ * completion. Note that if a conflicting fence is already on the dma-buf (i.e.
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+ * an exclusive fence when adding a read, or any fence when adding a write),
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+ * -EBUSY is reported. Serialisation between operations should be handled
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+ * by waiting upon the dma-buf.
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+ *
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+ * This returns the handle for the new fence that must be signaled within 10
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+ * seconds (or otherwise it will automatically expire). See
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+ * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL).
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+ *
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+ * If the vGEM handle does not exist, vgem_fence_attach_ioctl returns -ENOENT.
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+ */
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+int vgem_fence_attach_ioctl(struct drm_device *dev,
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+ void *data,
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+ struct drm_file *file)
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+{
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+ struct drm_vgem_fence_attach *arg = data;
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+ struct vgem_file *vfile = file->driver_priv;
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+ struct reservation_object *resv;
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+ struct drm_gem_object *obj;
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+ struct fence *fence;
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+ int ret;
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+
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+ if (arg->flags & ~VGEM_FENCE_WRITE)
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+ return -EINVAL;
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+
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+ if (arg->pad)
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+ return -EINVAL;
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+
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+ obj = drm_gem_object_lookup(file, arg->handle);
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+ if (!obj)
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+ return -ENOENT;
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+
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+ ret = attach_dmabuf(dev, obj);
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+ if (ret)
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+ goto err;
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+
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+ fence = vgem_fence_create(vfile, arg->flags);
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+ if (!fence) {
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+ ret = -ENOMEM;
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+ goto err;
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+ }
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+
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+ /* Check for a conflicting fence */
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+ resv = obj->dma_buf->resv;
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+ if (!reservation_object_test_signaled_rcu(resv,
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+ arg->flags & VGEM_FENCE_WRITE)) {
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+ ret = -EBUSY;
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+ goto err_fence;
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+ }
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+
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+ /* Expose the fence via the dma-buf */
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+ ret = 0;
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+ mutex_lock(&resv->lock.base);
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+ if (arg->flags & VGEM_FENCE_WRITE)
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+ reservation_object_add_excl_fence(resv, fence);
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+ else if ((ret = reservation_object_reserve_shared(resv)) == 0)
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+ reservation_object_add_shared_fence(resv, fence);
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+ mutex_unlock(&resv->lock.base);
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+
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+ /* Record the fence in our idr for later signaling */
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+ if (ret == 0) {
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+ mutex_lock(&vfile->fence_mutex);
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+ ret = idr_alloc(&vfile->fence_idr, fence, 1, 0, GFP_KERNEL);
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+ mutex_unlock(&vfile->fence_mutex);
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+ if (ret > 0) {
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+ arg->out_fence = ret;
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+ ret = 0;
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+ }
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+ }
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+err_fence:
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+ if (ret) {
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+ fence_signal(fence);
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+ fence_put(fence);
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+ }
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+err:
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+ drm_gem_object_unreference_unlocked(obj);
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+ return ret;
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+}
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+
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+/*
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+ * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL):
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+ *
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+ * Signal and consume a fence ealier attached to a vGEM handle using
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+ * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH).
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+ *
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+ * All fences must be signaled within 10s of attachment or otherwise they
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+ * will automatically expire (and a vgem_fence_signal_ioctl returns -ETIMEDOUT).
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+ *
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+ * Signaling a fence indicates to all consumers of the dma-buf that the
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+ * client has completed the operation associated with the fence, and that the
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+ * buffer is then ready for consumption.
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+ *
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+ * If the fence does not exist (or has already been signaled by the client),
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+ * vgem_fence_signal_ioctl returns -ENOENT.
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+ */
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+int vgem_fence_signal_ioctl(struct drm_device *dev,
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+ void *data,
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+ struct drm_file *file)
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+{
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+ struct vgem_file *vfile = file->driver_priv;
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+ struct drm_vgem_fence_signal *arg = data;
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+ struct fence *fence;
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+ int ret;
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+
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+ if (arg->flags)
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+ return -EINVAL;
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+
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+ mutex_lock(&vfile->fence_mutex);
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+ fence = idr_replace(&vfile->fence_idr, NULL, arg->fence);
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+ mutex_unlock(&vfile->fence_mutex);
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+ if (!fence)
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+ return -ENOENT;
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+ if (IS_ERR(fence))
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+ return PTR_ERR(fence);
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+
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+ if (fence_is_signaled(fence))
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+ ret = -ETIMEDOUT;
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+
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+ fence_signal(fence);
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+ fence_put(fence);
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+ return ret;
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+}
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+
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+int vgem_fence_open(struct vgem_file *vfile)
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+{
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+ mutex_init(&vfile->fence_mutex);
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+ idr_init(&vfile->fence_idr);
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+
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+ return 0;
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+}
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+
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+static int __vgem_fence_idr_fini(int id, void *p, void *data)
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+{
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+ fence_signal(p);
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+ fence_put(p);
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+ return 0;
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+}
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+
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+void vgem_fence_close(struct vgem_file *vfile)
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+{
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+ idr_for_each(&vfile->fence_idr, __vgem_fence_idr_fini, vfile);
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+ idr_destroy(&vfile->fence_idr);
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+}
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