From: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx> Implement the bind and unbind of an object at the specified GPU virtual addresses. Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx> Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@xxxxxxxxx> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx> Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 21 ++ .../drm/i915/gem/i915_gem_vm_bind_object.c | 322 ++++++++++++++++++ drivers/gpu/drm/i915/gt/intel_gtt.c | 10 + drivers/gpu/drm/i915/gt/intel_gtt.h | 9 + drivers/gpu/drm/i915/i915_driver.c | 1 + drivers/gpu/drm/i915/i915_vma.c | 3 +- drivers/gpu/drm/i915/i915_vma.h | 2 - drivers/gpu/drm/i915/i915_vma_types.h | 14 + include/uapi/drm/i915_drm.h | 163 +++++++++ 10 files changed, 543 insertions(+), 3 deletions(-) create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 522ef9b4aff32..4e1627e96c6e0 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -165,6 +165,7 @@ gem-y += \ gem/i915_gem_ttm_move.o \ gem/i915_gem_ttm_pm.o \ gem/i915_gem_userptr.o \ + gem/i915_gem_vm_bind_object.o \ gem/i915_gem_wait.o \ gem/i915_gemfs.o i915-y += \ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h new file mode 100644 index 0000000000000..ebc493b7dafc1 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2022 Intel Corporation + */ + +#ifndef __I915_GEM_VM_BIND_H +#define __I915_GEM_VM_BIND_H + +#include "i915_drv.h" + +struct i915_vma * +i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va); +void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj); + +int i915_gem_vm_bind_ioctl(struct drm_device *dev, void *data, + struct drm_file *file); +int i915_gem_vm_unbind_ioctl(struct drm_device *dev, void *data, + struct drm_file *file); + +void i915_gem_vm_unbind_vma_all(struct i915_address_space *vm); +#endif /* __I915_GEM_VM_BIND_H */ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c new file mode 100644 index 0000000000000..dadd1d4b1761b --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c @@ -0,0 +1,322 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include <linux/interval_tree_generic.h> + +#include "gem/i915_gem_vm_bind.h" +#include "gem/i915_gem_context.h" +#include "gt/gen8_engine_cs.h" + +#include "i915_drv.h" +#include "i915_gem_gtt.h" + +#define START(node) ((node)->start) +#define LAST(node) ((node)->last) + +INTERVAL_TREE_DEFINE(struct i915_vma, rb, u64, __subtree_last, + START, LAST, static inline, i915_vm_bind_it) + +#undef START +#undef LAST + +/** + * DOC: VM_BIND/UNBIND ioctls + * + * DRM_I915_GEM_VM_BIND/UNBIND ioctls allows UMD to bind/unbind GEM buffer + * objects (BOs) or sections of a BOs at specified GPU virtual addresses on a + * specified address space (VM). Multiple mappings can map to the same physical + * pages of an object (aliasing). These mappings (also referred to as persistent + * mappings) will be persistent across multiple GPU submissions (execbuf calls) + * issued by the UMD, without user having to provide a list of all required + * mappings during each submission (as required by older execbuf mode). + * + * The VM_BIND/UNBIND calls allow UMDs to request a timeline out fence for + * signaling the completion of bind/unbind operation. + * + * VM_BIND feature is advertised to user via I915_PARAM_VM_BIND_VERSION. + * User has to opt-in for VM_BIND mode of binding for an address space (VM) + * during VM creation time via I915_VM_CREATE_FLAGS_USE_VM_BIND extension. + * + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently + * are not ordered. Furthermore, parts of the VM_BIND/UNBIND operations can be + * done asynchronously, when valid out fence is specified. + * + * VM_BIND locking order is as below. + * + * 1) vm_bind_lock mutex will protect vm_bind lists. This lock is taken in + * vm_bind/vm_unbind ioctl calls, in the execbuf path and while releasing the + * mapping. + * + * In future, when GPU page faults are supported, we can potentially use a + * rwsem instead, so that multiple page fault handlers can take the read + * side lock to lookup the mapping and hence can run in parallel. + * The older execbuf mode of binding do not need this lock. + * + * 2) The object's dma-resv lock will protect i915_vma state and needs + * to be held while binding/unbinding a vma in the async worker and while + * updating dma-resv fence list of an object. Note that private BOs of a VM + * will all share a dma-resv object. + * + * 3) Spinlock/s to protect some of the VM's lists like the list of + * invalidated vmas (due to eviction and userptr invalidation) etc. + */ + +/** + * i915_gem_vm_bind_lookup_vma() - lookup for the vma with a starting addr + * @vm: virtual address space in which vma needs to be looked for + * @va: starting addr of the vma + * + * retrieves the vma with a starting address from the vm's vma tree. + * + * Returns: returns vma on success, NULL on failure. + */ +struct i915_vma * +i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va) +{ + lockdep_assert_held(&vm->vm_bind_lock); + + return i915_vm_bind_it_iter_first(&vm->va, va, va); +} + +/** + * i915_gem_vm_bind_remove() - Remove vma from the vm bind list + * @vma: vma that needs to be removed + * @release_obj: object to be release or not + * + * Removes the vma from the vm's lists custom interval tree + */ +void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj) +{ + lockdep_assert_held(&vma->vm->vm_bind_lock); + + if (!list_empty(&vma->vm_bind_link)) { + list_del_init(&vma->vm_bind_link); + i915_vm_bind_it_remove(vma, &vma->vm->va); + + /* Release object */ + if (release_obj) + i915_gem_object_put(vma->obj); + } +} + +static int i915_gem_vm_unbind_vma(struct i915_address_space *vm, + struct i915_vma *vma, + struct drm_i915_gem_vm_unbind *va) +{ + struct drm_i915_gem_object *obj; + int ret; + + if (vma) { + obj = vma->obj; + i915_vma_destroy(vma); + + goto exit; + } + + if (!va) + return -EINVAL; + + ret = mutex_lock_interruptible(&vm->vm_bind_lock); + if (ret) + return ret; + + va->start = gen8_noncanonical_addr(va->start); + vma = i915_gem_vm_bind_lookup_vma(vm, va->start); + + if (!vma) + ret = -ENOENT; + else if (vma->size != va->length) + ret = -EINVAL; + + if (ret) { + mutex_unlock(&vm->vm_bind_lock); + return ret; + } + + i915_gem_vm_bind_remove(vma, false); + + mutex_unlock(&vm->vm_bind_lock); + + /* Destroy vma and then release object */ + obj = vma->obj; + ret = i915_gem_object_lock(obj, NULL); + if (ret) + return ret; + + i915_vma_destroy(vma); + i915_gem_object_unlock(obj); + +exit: + i915_gem_object_put(obj); + + return 0; +} + +/** + * i915_gem_vm_unbind_vma_all() - Unbind all vmas from an address space + * @vm: Address spece from which vma binding needs to be removed + * + * Unbind all userspace requested object binding + */ +void i915_gem_vm_unbind_vma_all(struct i915_address_space *vm) +{ + struct i915_vma *vma, *t; + + list_for_each_entry_safe(vma, t, &vm->vm_bound_list, vm_bind_link) + WARN_ON(i915_gem_vm_unbind_vma(vm, vma, NULL)); +} + +static struct i915_vma *vm_bind_get_vma(struct i915_address_space *vm, + struct drm_i915_gem_object *obj, + struct drm_i915_gem_vm_bind *va) +{ + struct i915_ggtt_view view; + struct i915_vma *vma; + + va->start = gen8_noncanonical_addr(va->start); + vma = i915_gem_vm_bind_lookup_vma(vm, va->start); + if (vma) + return ERR_PTR(-EEXIST); + + view.type = I915_GGTT_VIEW_PARTIAL; + view.partial.offset = va->offset >> PAGE_SHIFT; + view.partial.size = va->length >> PAGE_SHIFT; + vma = i915_vma_instance(obj, vm, &view); + if (IS_ERR(vma)) + return vma; + + vma->start = va->start; + vma->last = va->start + va->length - 1; + + return vma; +} + +static int i915_gem_vm_bind_obj(struct i915_address_space *vm, + struct drm_i915_gem_vm_bind *va, + struct drm_file *file) +{ + struct drm_i915_gem_object *obj; + struct i915_vma *vma = NULL; + struct i915_gem_ww_ctx ww; + u64 pin_flags; + int ret = 0; + + if (!vm->vm_bind_mode) + return -EOPNOTSUPP; + + obj = i915_gem_object_lookup(file, va->handle); + if (!obj) + return -ENOENT; + + if (!va->length || + !IS_ALIGNED(va->offset | va->length, + i915_gem_object_max_page_size(obj->mm.placements, + obj->mm.n_placements)) || + range_overflows_t(u64, va->offset, va->length, obj->base.size)) { + ret = -EINVAL; + goto put_obj; + } + + ret = mutex_lock_interruptible(&vm->vm_bind_lock); + if (ret) + goto put_obj; + + vma = vm_bind_get_vma(vm, obj, va); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto unlock_vm; + } + + for_i915_gem_ww(&ww, ret, true) { +retry: + ret = i915_gem_object_lock(vma->obj, &ww); + if (ret) + goto out_ww; + + ret = i915_vma_pin_ww(vma, &ww, 0, 0, pin_flags); + if (ret) + goto out_ww; + + /* Make it evictable */ + __i915_vma_unpin(vma); + + list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list); + i915_vm_bind_it_insert(vma, &vm->va); + +out_ww: + if (ret == -EDEADLK) { + ret = i915_gem_ww_ctx_backoff(&ww); + if (!ret) + goto retry; + } else { + /* Hold object reference until vm_unbind */ + i915_gem_object_get(vma->obj); + } + } + +unlock_vm: + mutex_unlock(&vm->vm_bind_lock); + +put_obj: + i915_gem_object_put(obj); + + return ret; +} + +/** + * i915_gem_vm_bind_ioctl() - ioctl function for binding an obj into + * virtual address + * @dev: drm device associated to the virtual address + * @data: data related to the vm bind required + * @file: drm_file related to he ioctl + * + * Implements a function to bind the object into the virtual address + * + * Returns 0 on success, error code on failure. + */ +int i915_gem_vm_bind_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_gem_vm_bind *args = data; + struct i915_address_space *vm; + int ret; + + vm = i915_gem_vm_lookup(file->driver_priv, args->vm_id); + if (unlikely(!vm)) + return -ENOENT; + + ret = i915_gem_vm_bind_obj(vm, args, file); + + i915_vm_put(vm); + return ret; +} + +/** + * i915_gem_vm_unbind_ioctl() - ioctl function for unbinding an obj from + * virtual address + * @dev: drm device associated to the virtual address + * @data: data related to the binding that needs to be unbinded + * @file: drm_file related to the ioctl + * + * Implements a function to unbind the object from the virtual address + * + * Returns 0 on success, error code on failure. + */ +int i915_gem_vm_unbind_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_gem_vm_unbind *args = data; + struct i915_address_space *vm; + int ret; + + vm = i915_gem_vm_lookup(file->driver_priv, args->vm_id); + if (unlikely(!vm)) + return -ENOENT; + + ret = i915_gem_vm_unbind_vma(vm, NULL, args); + + i915_vm_put(vm); + return ret; +} diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index b67831833c9a3..cb188377b7bd9 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -12,6 +12,7 @@ #include "gem/i915_gem_internal.h" #include "gem/i915_gem_lmem.h" +#include "gem/i915_gem_vm_bind.h" #include "i915_trace.h" #include "i915_utils.h" #include "intel_gt.h" @@ -176,6 +177,8 @@ int i915_vm_lock_objects(struct i915_address_space *vm, void i915_address_space_fini(struct i915_address_space *vm) { drm_mm_takedown(&vm->mm); + GEM_BUG_ON(!RB_EMPTY_ROOT(&vm->va.rb_root)); + mutex_destroy(&vm->vm_bind_lock); } /** @@ -204,6 +207,8 @@ static void __i915_vm_release(struct work_struct *work) __i915_vm_close(vm); + i915_gem_vm_unbind_vma_all(vm); + /* Synchronize async unbinds. */ i915_vma_resource_bind_dep_sync_all(vm); @@ -282,6 +287,11 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass) INIT_LIST_HEAD(&vm->bound_list); INIT_LIST_HEAD(&vm->unbound_list); + + vm->va = RB_ROOT_CACHED; + INIT_LIST_HEAD(&vm->vm_bind_list); + INIT_LIST_HEAD(&vm->vm_bound_list); + mutex_init(&vm->vm_bind_lock); } void *__px_vaddr(struct drm_i915_gem_object *p) diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h index da21088890b3b..06a259475816b 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.h +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h @@ -259,6 +259,15 @@ struct i915_address_space { */ struct list_head unbound_list; + /** @vm_bind_lock: Mutex to protect @vm_bind_list and @vm_bound_list */ + struct mutex vm_bind_lock; + /** @vm_bind_list: List of vm_binding in process */ + struct list_head vm_bind_list; + /** @vm_bound_list: List of vm_binding completed */ + struct list_head vm_bound_list; + /* @va: tree of persistent vmas */ + struct rb_root_cached va; + /* Global GTT */ bool is_ggtt:1; diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c index 1332c70370a68..9a9010fd9ecfa 100644 --- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -68,6 +68,7 @@ #include "gem/i915_gem_ioctls.h" #include "gem/i915_gem_mman.h" #include "gem/i915_gem_pm.h" +#include "gem/i915_gem_vm_bind.h" #include "gt/intel_gt.h" #include "gt/intel_gt_pm.h" #include "gt/intel_rc6.h" diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index 2603717164900..092ae4309d8a1 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -29,6 +29,7 @@ #include "display/intel_frontbuffer.h" #include "gem/i915_gem_lmem.h" #include "gem/i915_gem_tiling.h" +#include "gem/i915_gem_vm_bind.h" #include "gt/intel_engine.h" #include "gt/intel_engine_heartbeat.h" #include "gt/intel_gt.h" @@ -234,6 +235,7 @@ vma_create(struct drm_i915_gem_object *obj, spin_unlock(&obj->vma.lock); mutex_unlock(&vm->mutex); + INIT_LIST_HEAD(&vma->vm_bind_link); return vma; err_unlock: @@ -290,7 +292,6 @@ i915_vma_instance(struct drm_i915_gem_object *obj, { struct i915_vma *vma; - GEM_BUG_ON(view && !i915_is_ggtt_or_dpt(vm)); GEM_BUG_ON(!kref_read(&vm->ref)); spin_lock(&obj->vma.lock); diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h index 33a58f605d75c..15eac55a3e274 100644 --- a/drivers/gpu/drm/i915/i915_vma.h +++ b/drivers/gpu/drm/i915/i915_vma.h @@ -164,8 +164,6 @@ i915_vma_compare(struct i915_vma *vma, { ptrdiff_t cmp; - GEM_BUG_ON(view && !i915_is_ggtt_or_dpt(vm)); - cmp = ptrdiff(vma->vm, vm); if (cmp) return cmp; diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h index be6e028c3b57d..f746fecae85ed 100644 --- a/drivers/gpu/drm/i915/i915_vma_types.h +++ b/drivers/gpu/drm/i915/i915_vma_types.h @@ -289,6 +289,20 @@ struct i915_vma { /** This object's place on the active/inactive lists */ struct list_head vm_link; + /** @vm_bind_link: node for the vm_bind related lists of vm */ + struct list_head vm_bind_link; + + /** Interval tree structures for persistent vma */ + + /** @rb: node for the interval tree of vm for persistent vmas */ + struct rb_node rb; + /** @start: start endpoint of the rb node */ + u64 start; + /** @last: Last endpoint of the rb node */ + u64 last; + /** @__subtree_last: last in subtree */ + u64 __subtree_last; + struct list_head obj_link; /* Link in the object's VMA list */ struct rb_node obj_node; struct hlist_node obj_hash; diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 12435db751eb8..3da0e07f84bbd 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1507,6 +1507,41 @@ struct drm_i915_gem_execbuffer2 { #define i915_execbuffer2_get_context_id(eb2) \ ((eb2).rsvd1 & I915_EXEC_CONTEXT_ID_MASK) +/** + * struct drm_i915_gem_timeline_fence - An input or output timeline fence. + * + * The operation will wait for input fence to signal. + * + * The returned output fence will be signaled after the completion of the + * operation. + */ +struct drm_i915_gem_timeline_fence { + /** @handle: User's handle for a drm_syncobj to wait on or signal. */ + __u32 handle; + + /** + * @flags: Supported flags are: + * + * I915_TIMELINE_FENCE_WAIT: + * Wait for the input fence before the operation. + * + * I915_TIMELINE_FENCE_SIGNAL: + * Return operation completion fence as output. + */ + __u32 flags; +#define I915_TIMELINE_FENCE_WAIT (1 << 0) +#define I915_TIMELINE_FENCE_SIGNAL (1 << 1) +#define __I915_TIMELINE_FENCE_UNKNOWN_FLAGS (-(I915_TIMELINE_FENCE_SIGNAL << 1)) + + /** + * @value: A point in the timeline. + * Value must be 0 for a binary drm_syncobj. A Value of 0 for a + * timeline drm_syncobj is invalid as it turns a drm_syncobj into a + * binary one. + */ + __u64 value; +}; + struct drm_i915_gem_pin { /** Handle of the buffer to be pinned. */ __u32 handle; @@ -3718,6 +3753,134 @@ struct drm_i915_gem_create_ext_protected_content { /* ID of the protected content session managed by i915 when PXP is active */ #define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf +/** + * struct drm_i915_gem_vm_bind - VA to object mapping to bind. + * + * This structure is passed to VM_BIND ioctl and specifies the mapping of GPU + * virtual address (VA) range to the section of an object that should be bound + * in the device page table of the specified address space (VM). + * The VA range specified must be unique (ie., not currently bound) and can + * be mapped to whole object or a section of the object (partial binding). + * Multiple VA mappings can be created to the same section of the object + * (aliasing). + * + * The @start, @offset and @length must be 4K page aligned. However the DG2 + * and XEHPSDV has 64K page size for device local memory and has compact page + * table. On those platforms, for binding device local-memory objects, the + * @start, @offset and @length must be 64K aligned. Also, UMDs should not mix + * the local memory 64K page and the system memory 4K page bindings in the same + * 2M range. + * + * Error code -EINVAL will be returned if @start, @offset and @length are not + * properly aligned. In version 1 (See I915_PARAM_VM_BIND_VERSION), error code + * -ENOSPC will be returned if the VA range specified can't be reserved. + * + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently + * are not ordered. Furthermore, parts of the VM_BIND operation can be done + * asynchronously, if valid @fence is specified. + */ +struct drm_i915_gem_vm_bind { + /** @vm_id: VM (address space) id to bind */ + __u32 vm_id; + + /** @handle: Object handle */ + __u32 handle; + + /** @start: Virtual Address start to bind */ + __u64 start; + + /** @offset: Offset in object to bind */ + __u64 offset; + + /** @length: Length of mapping to bind */ + __u64 length; + + /** + * @flags: Currently reserved, MBZ. + * + * Note that @fence carries its own flags. + */ + __u64 flags; + + /** + * @fence: Timeline fence for bind completion signaling. + * + * Timeline fence is of format struct drm_i915_gem_timeline_fence. + * + * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag + * is invalid, and an error will be returned. + * + * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence + * is not requested and binding is completed synchronously. + */ + struct drm_i915_gem_timeline_fence fence; + + /** + * @extensions: Zero-terminated chain of extensions. + * + * For future extensions. See struct i915_user_extension. + */ + __u64 extensions; +}; + +/** + * struct drm_i915_gem_vm_unbind - VA to object mapping to unbind. + * + * This structure is passed to VM_UNBIND ioctl and specifies the GPU virtual + * address (VA) range that should be unbound from the device page table of the + * specified address space (VM). VM_UNBIND will force unbind the specified + * range from device page table without waiting for any GPU job to complete. + * It is UMDs responsibility to ensure the mapping is no longer in use before + * calling VM_UNBIND. + * + * If the specified mapping is not found, the ioctl will simply return without + * any error. + * + * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently + * are not ordered. Furthermore, parts of the VM_UNBIND operation can be done + * asynchronously, if valid @fence is specified. + */ +struct drm_i915_gem_vm_unbind { + /** @vm_id: VM (address space) id to bind */ + __u32 vm_id; + + /** @rsvd: Reserved, MBZ */ + __u32 rsvd; + + /** @start: Virtual Address start to unbind */ + __u64 start; + + /** @length: Length of mapping to unbind */ + __u64 length; + + /** + * @flags: Currently reserved, MBZ. + * + * Note that @fence carries its own flags. + */ + __u64 flags; + + /** + * @fence: Timeline fence for unbind completion signaling. + * + * Timeline fence is of format struct drm_i915_gem_timeline_fence. + * + * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag + * is invalid, and an error will be returned. + * + * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence + * is not requested and unbinding is completed synchronously. + */ + struct drm_i915_gem_timeline_fence fence; + + /** + * @extensions: Zero-terminated chain of extensions. + * + * For future extensions. See struct i915_user_extension. + */ + __u64 extensions; +}; + #if defined(__cplusplus) } #endif -- 2.34.1