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