diff options
Diffstat (limited to 'drivers/gpu/drm/msm/msm_fence.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_fence.c | 163 |
1 files changed, 163 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 000000000000..a9b9b1c95a2e --- /dev/null +++ b/drivers/gpu/drm/msm/msm_fence.c @@ -0,0 +1,163 @@ +/* + * Copyright (C) 2013-2016 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/fence.h> + +#include "msm_drv.h" +#include "msm_fence.h" + + +struct msm_fence_context * +msm_fence_context_alloc(struct drm_device *dev, const char *name) +{ + struct msm_fence_context *fctx; + + fctx = kzalloc(sizeof(*fctx), GFP_KERNEL); + if (!fctx) + return ERR_PTR(-ENOMEM); + + fctx->dev = dev; + fctx->name = name; + fctx->context = fence_context_alloc(1); + init_waitqueue_head(&fctx->event); + spin_lock_init(&fctx->spinlock); + + return fctx; +} + +void msm_fence_context_free(struct msm_fence_context *fctx) +{ + kfree(fctx); +} + +static inline bool fence_completed(struct msm_fence_context *fctx, uint32_t fence) +{ + return (int32_t)(fctx->completed_fence - fence) >= 0; +} + +/* legacy path for WAIT_FENCE ioctl: */ +int msm_wait_fence(struct msm_fence_context *fctx, uint32_t fence, + ktime_t *timeout, bool interruptible) +{ + int ret; + + if (fence > fctx->last_fence) { + DRM_ERROR("%s: waiting on invalid fence: %u (of %u)\n", + fctx->name, fence, fctx->last_fence); + return -EINVAL; + } + + if (!timeout) { + /* no-wait: */ + ret = fence_completed(fctx, fence) ? 0 : -EBUSY; + } else { + unsigned long remaining_jiffies = timeout_to_jiffies(timeout); + + if (interruptible) + ret = wait_event_interruptible_timeout(fctx->event, + fence_completed(fctx, fence), + remaining_jiffies); + else + ret = wait_event_timeout(fctx->event, + fence_completed(fctx, fence), + remaining_jiffies); + + if (ret == 0) { + DBG("timeout waiting for fence: %u (completed: %u)", + fence, fctx->completed_fence); + ret = -ETIMEDOUT; + } else if (ret != -ERESTARTSYS) { + ret = 0; + } + } + + return ret; +} + +/* called from workqueue */ +void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence) +{ + spin_lock(&fctx->spinlock); + fctx->completed_fence = max(fence, fctx->completed_fence); + spin_unlock(&fctx->spinlock); + + wake_up_all(&fctx->event); +} + +struct msm_fence { + struct msm_fence_context *fctx; + struct fence base; +}; + +static inline struct msm_fence *to_msm_fence(struct fence *fence) +{ + return container_of(fence, struct msm_fence, base); +} + +static const char *msm_fence_get_driver_name(struct fence *fence) +{ + return "msm"; +} + +static const char *msm_fence_get_timeline_name(struct fence *fence) +{ + struct msm_fence *f = to_msm_fence(fence); + return f->fctx->name; +} + +static bool msm_fence_enable_signaling(struct fence *fence) +{ + return true; +} + +static bool msm_fence_signaled(struct fence *fence) +{ + struct msm_fence *f = to_msm_fence(fence); + return fence_completed(f->fctx, f->base.seqno); +} + +static void msm_fence_release(struct fence *fence) +{ + struct msm_fence *f = to_msm_fence(fence); + kfree_rcu(f, base.rcu); +} + +static const struct fence_ops msm_fence_ops = { + .get_driver_name = msm_fence_get_driver_name, + .get_timeline_name = msm_fence_get_timeline_name, + .enable_signaling = msm_fence_enable_signaling, + .signaled = msm_fence_signaled, + .wait = fence_default_wait, + .release = msm_fence_release, +}; + +struct 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; + + fence_init(&f->base, &msm_fence_ops, &fctx->spinlock, + fctx->context, ++fctx->last_fence); + + return &f->base; +} |