@@ -167,3 +167,5 @@ int drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
+int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_private);
@@ -657,6 +657,8 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
DRM_UNLOCKED|DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
DRM_UNLOCKED|DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
+ DRM_UNLOCKED|DRM_RENDER_ALLOW),
};
#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
@@ -1,5 +1,7 @@
/*
* Copyright 2017 Red Hat
+ * Parts ported from amdgpu (fence wait code).
+ * Copyright 2016 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -31,6 +33,9 @@
* that contain an optional fence. The fence can be updated with a new
* fence, or be NULL.
*
+ * syncobj's can be waited upon, where it will wait for the underlying
+ * fence.
+ *
* syncobj's can be export to fd's and back, these fd's are opaque and
* have no other use case, except passing the syncobj between processes.
*
@@ -447,3 +452,140 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
return drm_syncobj_fd_to_handle(file_private, args->fd,
&args->handle);
}
+
+/**
+ * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
+ *
+ * @timeout_nsec: timeout nsec component in ns, 0 for poll
+ *
+ * Calculate the timeout in jiffies from an absolute time in sec/nsec.
+ */
+static signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
+{
+ ktime_t abs_timeout, now;
+ u64 timeout_ns, timeout_jiffies64;
+
+ /* make 0 timeout means poll - absolute 0 doesn't seem valid */
+ if (timeout_nsec == 0)
+ return 0;
+
+ abs_timeout = ns_to_ktime(timeout_nsec);
+ now = ktime_get();
+
+ if (!ktime_after(abs_timeout, now))
+ return 0;
+
+ timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
+
+ timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
+ /* clamp timeout to avoid infinite timeout */
+ if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
+ return MAX_SCHEDULE_TIMEOUT - 1;
+
+ return timeout_jiffies64 + 1;
+}
+
+static int drm_syncobj_wait_fences(struct drm_device *dev,
+ struct drm_file *file_private,
+ struct drm_syncobj_wait *wait,
+ struct dma_fence **fences)
+{
+ signed long timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
+ signed long ret = 0;
+ uint32_t first = ~0;
+
+ if (wait->flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
+ uint32_t i;
+ for (i = 0; i < wait->count_handles; i++) {
+ ret = dma_fence_wait_timeout(fences[i], true, timeout);
+
+ /* Various dma_fence wait callbacks will return
+ * ENOENT to indicate that the fence has already
+ * been signaled. We need to sanitize this to 0 so
+ * we don't return early and the client doesn't see
+ * an unexpected error.
+ */
+ if (ret == -ENOENT)
+ ret = 0;
+
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ break;
+ timeout = ret;
+ }
+ first = 0;
+ } else {
+ ret = dma_fence_wait_any_timeout(fences,
+ wait->count_handles,
+ true, timeout,
+ &first);
+ }
+
+ if (ret < 0)
+ return ret;
+
+ wait->first_signaled = first;
+ if (ret == 0)
+ return -ETIME;
+ return 0;
+}
+
+int
+drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_private)
+{
+ struct drm_syncobj_wait *args = data;
+ uint32_t *handles;
+ struct dma_fence **fences;
+ int ret = 0;
+ uint32_t i;
+
+ if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+ return -ENODEV;
+
+ if (args->flags != 0 && args->flags != DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)
+ return -EINVAL;
+
+ if (args->count_handles == 0)
+ return -EINVAL;
+
+ /* Get the handles from userspace */
+ handles = kmalloc_array(args->count_handles, sizeof(uint32_t),
+ GFP_KERNEL);
+ if (handles == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(handles,
+ u64_to_user_ptr(args->handles),
+ sizeof(uint32_t) * args->count_handles)) {
+ ret = -EFAULT;
+ goto err_free_handles;
+ }
+
+ fences = kcalloc(args->count_handles,
+ sizeof(struct dma_fence *), GFP_KERNEL);
+ if (!fences) {
+ ret = -ENOMEM;
+ goto err_free_handles;
+ }
+
+ for (i = 0; i < args->count_handles; i++) {
+ ret = drm_syncobj_find_fence(file_private, handles[i],
+ &fences[i]);
+ if (ret)
+ goto err_free_fence_array;
+ }
+
+ ret = drm_syncobj_wait_fences(dev, file_private,
+ args, fences);
+
+err_free_fence_array:
+ for (i = 0; i < args->count_handles; i++)
+ dma_fence_put(fences[i]);
+ kfree(fences);
+err_free_handles:
+ kfree(handles);
+
+ return ret;
+}
@@ -718,6 +718,17 @@ struct drm_syncobj_handle {
__u32 pad;
};
+#define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL (1 << 0)
+struct drm_syncobj_wait {
+ __u64 handles;
+ /* absolute timeout */
+ __s64 timeout_nsec;
+ __u32 count_handles;
+ __u32 flags;
+ __u32 first_signaled; /* only valid when not waiting all */
+ __u32 pad;
+};
+
#if defined(__cplusplus)
}
#endif
@@ -840,6 +851,7 @@ extern "C" {
#define DRM_IOCTL_SYNCOBJ_DESTROY DRM_IOWR(0xC0, struct drm_syncobj_destroy)
#define DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD DRM_IOWR(0xC1, struct drm_syncobj_handle)
#define DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE DRM_IOWR(0xC2, struct drm_syncobj_handle)
+#define DRM_IOCTL_SYNCOBJ_WAIT DRM_IOWR(0xC3, struct drm_syncobj_wait)
/**
* Device specific ioctls should only be in their respective headers