Merge tag 'drm-misc-next-fixes-2024-05-16' of...

Merge tag 'drm-misc-next-fixes-2024-05-16' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

drm-misc-next-fixes for v6.10-rc1:
- VM_BIND fix for nouveau.
- Lots of panthor fixes:
  * Fixes for panthor's heap logical block.
  * Reset on unrecoverable fault
  * Fix VM references.
  * Reset fix.
- xlnx compile and doc fixes.
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/54d2c8b9-8b04-45fc-b483-200ffac9d344@linux.intel.com

drivers/gpu/drm/nouveau/nouveau_abi16.c

@@ -272,6 +272,9 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 		getparam->value = (u64)ttm_resource_manager_usage(vram_mgr);
 		break;
 	}
+	case NOUVEAU_GETPARAM_HAS_VMA_TILEMODE:
+		getparam->value = 1;
+		break;
 	default:
 		NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
 		return -EINVAL;

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -241,28 +241,28 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 *size, int *align, u32 domain,
 	}
 
 	nvbo->contig = !(tile_flags & NOUVEAU_GEM_TILE_NONCONTIG);
-	if (!nouveau_cli_uvmm(cli) || internal) {
-		/* for BO noVM allocs, don't assign kinds */
-		if (cli->device.info.family >= NV_DEVICE_INFO_V0_FERMI) {
-			nvbo->kind = (tile_flags & 0x0000ff00) >> 8;
-			if (!nvif_mmu_kind_valid(mmu, nvbo->kind)) {
-				kfree(nvbo);
-				return ERR_PTR(-EINVAL);
-			}
 
-			nvbo->comp = mmu->kind[nvbo->kind] != nvbo->kind;
-		} else if (cli->device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
-			nvbo->kind = (tile_flags & 0x00007f00) >> 8;
-			nvbo->comp = (tile_flags & 0x00030000) >> 16;
-			if (!nvif_mmu_kind_valid(mmu, nvbo->kind)) {
-				kfree(nvbo);
-				return ERR_PTR(-EINVAL);
-			}
-		} else {
-			nvbo->zeta = (tile_flags & 0x00000007);
+	if (cli->device.info.family >= NV_DEVICE_INFO_V0_FERMI) {
+		nvbo->kind = (tile_flags & 0x0000ff00) >> 8;
+		if (!nvif_mmu_kind_valid(mmu, nvbo->kind)) {
+			kfree(nvbo);
+			return ERR_PTR(-EINVAL);
+		}
+
+		nvbo->comp = mmu->kind[nvbo->kind] != nvbo->kind;
+	} else if (cli->device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
+		nvbo->kind = (tile_flags & 0x00007f00) >> 8;
+		nvbo->comp = (tile_flags & 0x00030000) >> 16;
+		if (!nvif_mmu_kind_valid(mmu, nvbo->kind)) {
+			kfree(nvbo);
+			return ERR_PTR(-EINVAL);
 		}
-		nvbo->mode = tile_mode;
+	} else {
+		nvbo->zeta = (tile_flags & 0x00000007);
+	}
+	nvbo->mode = tile_mode;
 
+	if (!nouveau_cli_uvmm(cli) || internal) {
 		/* Determine the desirable target GPU page size for the buffer. */
 		for (i = 0; i < vmm->page_nr; i++) {
 			/* Because we cannot currently allow VMM maps to fail
@@ -304,12 +304,6 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 *size, int *align, u32 domain,
 		}
 		nvbo->page = vmm->page[pi].shift;
 	} else {
-		/* reject other tile flags when in VM mode. */
-		if (tile_mode)
-			return ERR_PTR(-EINVAL);
-		if (tile_flags & ~NOUVEAU_GEM_TILE_NONCONTIG)
-			return ERR_PTR(-EINVAL);
-
 		/* Determine the desirable target GPU page size for the buffer. */
 		for (i = 0; i < vmm->page_nr; i++) {
 			/* Because we cannot currently allow VMM maps to fail

drivers/gpu/drm/panthor/panthor_device.c

@@ -129,13 +129,8 @@ static void panthor_device_reset_work(struct work_struct *work)
 	panthor_gpu_l2_power_on(ptdev);
 	panthor_mmu_post_reset(ptdev);
 	ret = panthor_fw_post_reset(ptdev);
-	if (ret)
-		goto out_dev_exit;
-
 	atomic_set(&ptdev->reset.pending, 0);
-	panthor_sched_post_reset(ptdev);
-
-out_dev_exit:
+	panthor_sched_post_reset(ptdev, ret != 0);
 	drm_dev_exit(cookie);
 
 	if (ret) {
@@ -293,6 +288,7 @@ static const struct panthor_exception_info panthor_exception_infos[] = {
 	PANTHOR_EXCEPTION(ACTIVE),
 	PANTHOR_EXCEPTION(CS_RES_TERM),
 	PANTHOR_EXCEPTION(CS_CONFIG_FAULT),
+	PANTHOR_EXCEPTION(CS_UNRECOVERABLE),
 	PANTHOR_EXCEPTION(CS_ENDPOINT_FAULT),
 	PANTHOR_EXCEPTION(CS_BUS_FAULT),
 	PANTHOR_EXCEPTION(CS_INSTR_INVALID),

drivers/gpu/drm/panthor/panthor_device.h

@@ -216,6 +216,7 @@ enum drm_panthor_exception_type {
 	DRM_PANTHOR_EXCEPTION_CS_RES_TERM = 0x0f,
 	DRM_PANTHOR_EXCEPTION_MAX_NON_FAULT = 0x3f,
 	DRM_PANTHOR_EXCEPTION_CS_CONFIG_FAULT = 0x40,
+	DRM_PANTHOR_EXCEPTION_CS_UNRECOVERABLE = 0x41,
 	DRM_PANTHOR_EXCEPTION_CS_ENDPOINT_FAULT = 0x44,
 	DRM_PANTHOR_EXCEPTION_CS_BUS_FAULT = 0x48,
 	DRM_PANTHOR_EXCEPTION_CS_INSTR_INVALID = 0x49,

drivers/gpu/drm/panthor/panthor_fw.c

@@ -453,7 +453,7 @@ panthor_fw_alloc_queue_iface_mem(struct panthor_device *ptdev,
 
 	ret = panthor_kernel_bo_vmap(mem);
 	if (ret) {
-		panthor_kernel_bo_destroy(panthor_fw_vm(ptdev), mem);
+		panthor_kernel_bo_destroy(mem);
 		return ERR_PTR(ret);
 	}
 
@@ -1134,7 +1134,7 @@ void panthor_fw_unplug(struct panthor_device *ptdev)
 	panthor_fw_stop(ptdev);
 
 	list_for_each_entry(section, &ptdev->fw->sections, node)
-		panthor_kernel_bo_destroy(panthor_fw_vm(ptdev), section->mem);
+		panthor_kernel_bo_destroy(section->mem);
 
 	/* We intentionally don't call panthor_vm_idle() and let
 	 * panthor_mmu_unplug() release the AS we acquired with
@@ -1142,6 +1142,7 @@ void panthor_fw_unplug(struct panthor_device *ptdev)
 	 * state to keep the active_refcnt balanced.
 	 */
 	panthor_vm_put(ptdev->fw->vm);
+	ptdev->fw->vm = NULL;
 
 	panthor_gpu_power_off(ptdev, L2, ptdev->gpu_info.l2_present, 20000);
 }

drivers/gpu/drm/panthor/panthor_gem.c

@@ -26,18 +26,18 @@ static void panthor_gem_free_object(struct drm_gem_object *obj)
 
 /**
  * panthor_kernel_bo_destroy() - Destroy a kernel buffer object
- * @vm: The VM this BO was mapped to.
  * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction
  * is skipped.
  */
-void panthor_kernel_bo_destroy(struct panthor_vm *vm,
-			       struct panthor_kernel_bo *bo)
+void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo)
 {
+	struct panthor_vm *vm;
 	int ret;
 
 	if (IS_ERR_OR_NULL(bo))
 		return;
 
+	vm = bo->vm;
 	panthor_kernel_bo_vunmap(bo);
 
 	if (drm_WARN_ON(bo->obj->dev,
@@ -53,6 +53,7 @@ void panthor_kernel_bo_destroy(struct panthor_vm *vm,
 	drm_gem_object_put(bo->obj);
 
 out_free_bo:
+	panthor_vm_put(vm);
 	kfree(bo);
 }
 
@@ -106,6 +107,7 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm,
 	if (ret)
 		goto err_free_va;
 
+	kbo->vm = panthor_vm_get(vm);
 	bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm);
 	drm_gem_object_get(bo->exclusive_vm_root_gem);
 	bo->base.base.resv = bo->exclusive_vm_root_gem->resv;

drivers/gpu/drm/panthor/panthor_gem.h

@@ -61,6 +61,11 @@ struct panthor_kernel_bo {
 	 */
 	struct drm_gem_object *obj;
 
+	/**
+	 * @vm: VM this private buffer is attached to.
+	 */
+	struct panthor_vm *vm;
+
 	/**
 	 * @va_node: VA space allocated to this GEM.
 	 */
@@ -136,7 +141,6 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm,
 			 size_t size, u32 bo_flags, u32 vm_map_flags,
 			 u64 gpu_va);
 
-void panthor_kernel_bo_destroy(struct panthor_vm *vm,
-			       struct panthor_kernel_bo *bo);
+void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo);
 
 #endif /* __PANTHOR_GEM_H__ */

drivers/gpu/drm/panthor/panthor_heap.c

@@ -127,7 +127,7 @@ static void panthor_free_heap_chunk(struct panthor_vm *vm,
 	heap->chunk_count--;
 	mutex_unlock(&heap->lock);
 
-	panthor_kernel_bo_destroy(vm, chunk->bo);
+	panthor_kernel_bo_destroy(chunk->bo);
 	kfree(chunk);
 }
 
@@ -183,7 +183,7 @@ static int panthor_alloc_heap_chunk(struct panthor_device *ptdev,
 	return 0;
 
 err_destroy_bo:
-	panthor_kernel_bo_destroy(vm, chunk->bo);
+	panthor_kernel_bo_destroy(chunk->bo);
 
 err_free_chunk:
 	kfree(chunk);
@@ -253,8 +253,8 @@ int panthor_heap_destroy(struct panthor_heap_pool *pool, u32 handle)
  * @pool: Pool to instantiate the heap context from.
  * @initial_chunk_count: Number of chunk allocated at initialization time.
  * Must be at least 1.
- * @chunk_size: The size of each chunk. Must be a power of two between 256k
- * and 2M.
+ * @chunk_size: The size of each chunk. Must be page-aligned and lie in the
+ * [128k:8M] range.
  * @max_chunks: Maximum number of chunks that can be allocated.
  * @target_in_flight: Maximum number of in-flight render passes.
  * @heap_ctx_gpu_va: Pointer holding the GPU address of the allocated heap
@@ -281,8 +281,11 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
 	if (initial_chunk_count == 0)
 		return -EINVAL;
 
-	if (hweight32(chunk_size) != 1 ||
-	    chunk_size < SZ_256K || chunk_size > SZ_2M)
+	if (initial_chunk_count > max_chunks)
+		return -EINVAL;
+
+	if (!IS_ALIGNED(chunk_size, PAGE_SIZE) ||
+	    chunk_size < SZ_128K || chunk_size > SZ_8M)
 		return -EINVAL;
 
 	down_read(&pool->lock);
@@ -320,7 +323,8 @@ int panthor_heap_create(struct panthor_heap_pool *pool,
 	if (!pool->vm) {
 		ret = -EINVAL;
 	} else {
-		ret = xa_alloc(&pool->xa, &id, heap, XA_LIMIT(1, MAX_HEAPS_PER_POOL), GFP_KERNEL);
+		ret = xa_alloc(&pool->xa, &id, heap,
+			       XA_LIMIT(0, MAX_HEAPS_PER_POOL - 1), GFP_KERNEL);
 		if (!ret) {
 			void *gpu_ctx = panthor_get_heap_ctx(pool, id);
 
@@ -391,7 +395,7 @@ int panthor_heap_return_chunk(struct panthor_heap_pool *pool,
 	mutex_unlock(&heap->lock);
 
 	if (removed) {
-		panthor_kernel_bo_destroy(pool->vm, chunk->bo);
+		panthor_kernel_bo_destroy(chunk->bo);
 		kfree(chunk);
 		ret = 0;
 	} else {
@@ -410,6 +414,13 @@ int panthor_heap_return_chunk(struct panthor_heap_pool *pool,
  * @renderpasses_in_flight: Number of render passes currently in-flight.
  * @pending_frag_count: Number of fragment jobs waiting for execution/completion.
  * @new_chunk_gpu_va: Pointer used to return the chunk VA.
+ *
+ * Return:
+ * - 0 if a new heap was allocated
+ * - -ENOMEM if the tiler context reached the maximum number of chunks
+ *   or if too many render passes are in-flight
+ *   or if the allocation failed
+ * - -EINVAL if any of the arguments passed to panthor_heap_grow() is invalid
  */
 int panthor_heap_grow(struct panthor_heap_pool *pool,
 		      u64 heap_gpu_va,
@@ -439,10 +450,7 @@ int panthor_heap_grow(struct panthor_heap_pool *pool,
 	 * handler provided by the userspace driver, if any).
 	 */
 	if (renderpasses_in_flight > heap->target_in_flight ||
-	    (pending_frag_count > 0 && heap->chunk_count >= heap->max_chunks)) {
-		ret = -EBUSY;
-		goto out_unlock;
-	} else if (heap->chunk_count >= heap->max_chunks) {
+	    heap->chunk_count >= heap->max_chunks) {
 		ret = -ENOMEM;
 		goto out_unlock;
 	}
@@ -536,7 +544,7 @@ panthor_heap_pool_create(struct panthor_device *ptdev, struct panthor_vm *vm)
 	pool->vm = vm;
 	pool->ptdev = ptdev;
 	init_rwsem(&pool->lock);
-	xa_init_flags(&pool->xa, XA_FLAGS_ALLOC1);
+	xa_init_flags(&pool->xa, XA_FLAGS_ALLOC);
 	kref_init(&pool->refcount);
 
 	pool->gpu_contexts = panthor_kernel_bo_create(ptdev, vm, bosize,
@@ -587,7 +595,7 @@ void panthor_heap_pool_destroy(struct panthor_heap_pool *pool)
 		drm_WARN_ON(&pool->ptdev->base, panthor_heap_destroy_locked(pool, i));
 
 	if (!IS_ERR_OR_NULL(pool->gpu_contexts))
-		panthor_kernel_bo_destroy(pool->vm, pool->gpu_contexts);
+		panthor_kernel_bo_destroy(pool->gpu_contexts);
 
 	/* Reflects the fact the pool has been destroyed. */
 	pool->vm = NULL;

drivers/gpu/drm/panthor/panthor_sched.c

@@ -826,8 +826,8 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
 
 	panthor_queue_put_syncwait_obj(queue);
 
-	panthor_kernel_bo_destroy(group->vm, queue->ringbuf);
-	panthor_kernel_bo_destroy(panthor_fw_vm(group->ptdev), queue->iface.mem);
+	panthor_kernel_bo_destroy(queue->ringbuf);
+	panthor_kernel_bo_destroy(queue->iface.mem);
 
 	kfree(queue);
 }
@@ -837,15 +837,14 @@ static void group_release_work(struct work_struct *work)
 	struct panthor_group *group = container_of(work,
 						   struct panthor_group,
 						   release_work);
-	struct panthor_device *ptdev = group->ptdev;
 	u32 i;
 
 	for (i = 0; i < group->queue_count; i++)
 		group_free_queue(group, group->queues[i]);
 
-	panthor_kernel_bo_destroy(panthor_fw_vm(ptdev), group->suspend_buf);
-	panthor_kernel_bo_destroy(panthor_fw_vm(ptdev), group->protm_suspend_buf);
-	panthor_kernel_bo_destroy(group->vm, group->syncobjs);
+	panthor_kernel_bo_destroy(group->suspend_buf);
+	panthor_kernel_bo_destroy(group->protm_suspend_buf);
+	panthor_kernel_bo_destroy(group->syncobjs);
 
 	panthor_vm_put(group->vm);
 	kfree(group);
@@ -1281,7 +1280,16 @@ cs_slot_process_fatal_event_locked(struct panthor_device *ptdev,
 	if (group)
 		group->fatal_queues |= BIT(cs_id);
 
-	sched_queue_delayed_work(sched, tick, 0);
+	if (CS_EXCEPTION_TYPE(fatal) == DRM_PANTHOR_EXCEPTION_CS_UNRECOVERABLE) {
+		/* If this exception is unrecoverable, queue a reset, and make
+		 * sure we stop scheduling groups until the reset has happened.
+		 */
+		panthor_device_schedule_reset(ptdev);
+		cancel_delayed_work(&sched->tick_work);
+	} else {
+		sched_queue_delayed_work(sched, tick, 0);
+	}
+
 	drm_warn(&ptdev->base,
 		 "CSG slot %d CS slot: %d\n"
 		 "CS_FATAL.EXCEPTION_TYPE: 0x%x (%s)\n"
@@ -1385,7 +1393,12 @@ static int group_process_tiler_oom(struct panthor_group *group, u32 cs_id)
 					pending_frag_count, &new_chunk_va);
 	}
 
-	if (ret && ret != -EBUSY) {
+	/* If the heap context doesn't have memory for us, we want to let the
+	 * FW try to reclaim memory by waiting for fragment jobs to land or by
+	 * executing the tiler OOM exception handler, which is supposed to
+	 * implement incremental rendering.
+	 */
+	if (ret && ret != -ENOMEM) {
 		drm_warn(&ptdev->base, "Failed to extend the tiler heap\n");
 		group->fatal_queues |= BIT(cs_id);
 		sched_queue_delayed_work(sched, tick, 0);
@@ -2720,15 +2733,22 @@ void panthor_sched_pre_reset(struct panthor_device *ptdev)
 	mutex_unlock(&sched->reset.lock);
 }
 
-void panthor_sched_post_reset(struct panthor_device *ptdev)
+void panthor_sched_post_reset(struct panthor_device *ptdev, bool reset_failed)
 {
 	struct panthor_scheduler *sched = ptdev->scheduler;
 	struct panthor_group *group, *group_tmp;
 
 	mutex_lock(&sched->reset.lock);
 
-	list_for_each_entry_safe(group, group_tmp, &sched->reset.stopped_groups, run_node)
+	list_for_each_entry_safe(group, group_tmp, &sched->reset.stopped_groups, run_node) {
+		/* Consider all previously running group as terminated if the
+		 * reset failed.
+		 */
+		if (reset_failed)
+			group->state = PANTHOR_CS_GROUP_TERMINATED;
+
 		panthor_group_start(group);
+	}
 
 	/* We're done resetting the GPU, clear the reset.in_progress bit so we can
 	 * kick the scheduler.
@@ -2736,9 +2756,11 @@ void panthor_sched_post_reset(struct panthor_device *ptdev)
 	atomic_set(&sched->reset.in_progress, false);
 	mutex_unlock(&sched->reset.lock);
 
-	sched_queue_delayed_work(sched, tick, 0);
-
-	sched_queue_work(sched, sync_upd);
+	/* No need to queue a tick and update syncs if the reset failed. */
+	if (!reset_failed) {
+		sched_queue_delayed_work(sched, tick, 0);
+		sched_queue_work(sched, sync_upd);
+	}
 }
 
 static void group_sync_upd_work(struct work_struct *work)

drivers/gpu/drm/panthor/panthor_sched.h

@@ -40,7 +40,7 @@ void panthor_group_pool_destroy(struct panthor_file *pfile);
 int panthor_sched_init(struct panthor_device *ptdev);
 void panthor_sched_unplug(struct panthor_device *ptdev);
 void panthor_sched_pre_reset(struct panthor_device *ptdev);
-void panthor_sched_post_reset(struct panthor_device *ptdev);
+void panthor_sched_post_reset(struct panthor_device *ptdev, bool reset_failed);
 void panthor_sched_suspend(struct panthor_device *ptdev);
 void panthor_sched_resume(struct panthor_device *ptdev);
 

drivers/gpu/drm/xlnx/zynqmp_disp.c

@@ -940,7 +940,7 @@ zynqmp_disp_layer_find_format(struct zynqmp_disp_layer *layer,
  * zynqmp_disp_layer_find_live_format - Find format information for given
  * media bus format
  * @layer: The layer
- * @drm_fmt: Media bus format to search
+ * @media_bus_format: Media bus format to search
  *
  * Search display subsystem format information corresponding to the given media
  * bus format @media_bus_format for the @layer, and return a pointer to the
@@ -981,7 +981,7 @@ u32 *zynqmp_disp_layer_drm_formats(struct zynqmp_disp_layer *layer,
 	unsigned int i;
 	u32 *formats;
 
-	if (WARN_ON(!layer->mode == ZYNQMP_DPSUB_LAYER_NONLIVE)) {
+	if (WARN_ON(layer->mode != ZYNQMP_DPSUB_LAYER_NONLIVE)) {
 		*num_formats = 0;
 		return NULL;
 	}
@@ -1117,7 +1117,7 @@ void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer,
 /**
  * zynqmp_disp_layer_set_live_format - Set the live video layer format
  * @layer: The layer
- * @info: The format info
+ * @media_bus_format: Media bus format to set
  *
  * NOTE: This function should not be used to set format for non-live video
  * layer. Use zynqmp_disp_layer_set_format() instead.

include/uapi/drm/nouveau_drm.h

@@ -68,6 +68,13 @@ extern "C" {
  */
 #define NOUVEAU_GETPARAM_VRAM_USED 19
 
+/*
+ * NOUVEAU_GETPARAM_HAS_VMA_TILEMODE
+ *
+ * Query whether tile mode and PTE kind are accepted with VM allocs or not.
+ */
+#define NOUVEAU_GETPARAM_HAS_VMA_TILEMODE 20
+
 struct drm_nouveau_getparam {
 	__u64 param;
 	__u64 value;

include/uapi/drm/panthor_drm.h

@@ -895,13 +895,21 @@ struct drm_panthor_tiler_heap_create {
 	/** @vm_id: VM ID the tiler heap should be mapped to */
 	__u32 vm_id;
 
-	/** @initial_chunk_count: Initial number of chunks to allocate. */
+	/** @initial_chunk_count: Initial number of chunks to allocate. Must be at least one. */
 	__u32 initial_chunk_count;
 
-	/** @chunk_size: Chunk size. Must be a power of two at least 256KB large. */
+	/**
+	 * @chunk_size: Chunk size.
+	 *
+	 * Must be page-aligned and lie in the [128k:8M] range.
+	 */
 	__u32 chunk_size;
 
-	/** @max_chunks: Maximum number of chunks that can be allocated. */
+	/**
+	 * @max_chunks: Maximum number of chunks that can be allocated.
+	 *
+	 * Must be at least @initial_chunk_count.
+	 */
 	__u32 max_chunks;
 
 	/**
@@ -931,7 +939,11 @@ struct drm_panthor_tiler_heap_create {
  * struct drm_panthor_tiler_heap_destroy - Arguments passed to DRM_IOCTL_PANTHOR_TILER_HEAP_DESTROY
  */
 struct drm_panthor_tiler_heap_destroy {
-	/** @handle: Handle of the tiler heap to destroy */
+	/**
+	 * @handle: Handle of the tiler heap to destroy.
+	 *
+	 * Must be a valid heap handle returned by DRM_IOCTL_PANTHOR_TILER_HEAP_CREATE.
+	 */
 	__u32 handle;
 
 	/** @pad: Padding field, MBZ. */