284 lines
7.7 KiB
C
284 lines
7.7 KiB
C
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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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#include <linux/dma-buf.h>
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#include <linux/reservation.h>
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#include "vgem_drv.h"
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#define VGEM_FENCE_TIMEOUT (10*HZ)
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struct vgem_fence {
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struct dma_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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static const char *vgem_fence_get_driver_name(struct dma_fence *fence)
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{
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return "vgem";
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}
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static const char *vgem_fence_get_timeline_name(struct dma_fence *fence)
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{
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return "unbound";
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}
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static bool vgem_fence_signaled(struct dma_fence *fence)
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{
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return false;
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}
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static bool vgem_fence_enable_signaling(struct dma_fence *fence)
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{
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return true;
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}
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static void vgem_fence_release(struct dma_fence *base)
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{
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struct vgem_fence *fence = container_of(base, typeof(*fence), base);
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del_timer_sync(&fence->timer);
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dma_fence_free(&fence->base);
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}
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static void vgem_fence_value_str(struct dma_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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static void vgem_fence_timeline_value_str(struct dma_fence *fence, char *str,
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int size)
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{
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snprintf(str, size, "%u",
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dma_fence_is_signaled(fence) ? fence->seqno : 0);
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}
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static const struct dma_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 = dma_fence_default_wait,
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.release = vgem_fence_release,
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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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static void vgem_fence_timeout(struct timer_list *t)
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{
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struct vgem_fence *fence = from_timer(fence, t, timer);
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dma_fence_signal(&fence->base);
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}
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static struct dma_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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fence = kzalloc(sizeof(*fence), GFP_KERNEL);
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if (!fence)
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return NULL;
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spin_lock_init(&fence->lock);
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dma_fence_init(&fence->base, &vgem_fence_ops, &fence->lock,
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dma_fence_context_alloc(1), 1);
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timer_setup(&fence->timer, vgem_fence_timeout, 0);
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/* We force the fence to expire within 10s to prevent driver hangs */
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mod_timer(&fence->timer, jiffies + VGEM_FENCE_TIMEOUT);
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return &fence->base;
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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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if (obj->dma_buf)
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return 0;
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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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obj->dma_buf = dmabuf;
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return 0;
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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 dma_fence *fence;
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int ret;
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if (arg->flags & ~VGEM_FENCE_WRITE)
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return -EINVAL;
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if (arg->pad)
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return -EINVAL;
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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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ret = attach_dmabuf(dev, obj);
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if (ret)
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goto err;
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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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/* 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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/* Expose the fence via the dma-buf */
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ret = 0;
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reservation_object_lock(resv, NULL);
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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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reservation_object_unlock(resv);
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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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dma_fence_signal(fence);
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dma_fence_put(fence);
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}
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err:
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drm_gem_object_put_unlocked(obj);
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return ret;
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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 dma_fence *fence;
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int ret = 0;
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if (arg->flags)
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return -EINVAL;
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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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if (dma_fence_is_signaled(fence))
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ret = -ETIMEDOUT;
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dma_fence_signal(fence);
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dma_fence_put(fence);
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return ret;
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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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return 0;
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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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dma_fence_signal(p);
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dma_fence_put(p);
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return 0;
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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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