[PATCH v2] drm/xe/uapi: Uniform async vs sync handling
Souza, Jose
jose.souza at intel.com
Wed Dec 13 14:13:06 UTC 2023
On Tue, 2023-12-12 at 20:35 -0800, Matthew Brost wrote:
> Remove concept of async vs sync VM bind queues, rather make async vs
> sync a per IOCTL choice. Since this is per IOCTL, it makes sense to have
> a singular flag IOCTL rather than per VM bind op flag too. Add
> DRM_XE_SYNCS_FLAG_WAIT_FOR_OP which is an input sync flag to support
> this. Support this new flag for both the VM bind IOCTL only with a path
> to support this for execs too.
>
> v2: Add cookie, move sync wait outside of any locks.
>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Cc: Francois Dugast <francois.dugast at intel.com>
> Signed-off-by: Matthew Brost <matthew.brost at intel.com>
> ---
> drivers/gpu/drm/xe/xe_exec.c | 12 ++-
> drivers/gpu/drm/xe/xe_exec_queue.c | 7 +-
> drivers/gpu/drm/xe/xe_exec_queue_types.h | 2 -
> drivers/gpu/drm/xe/xe_vm.c | 116 +++++++++++------------
> drivers/gpu/drm/xe/xe_vm_types.h | 13 ++-
> include/uapi/drm/xe_drm.h | 64 ++++++++-----
> 6 files changed, 109 insertions(+), 105 deletions(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_exec.c b/drivers/gpu/drm/xe/xe_exec.c
> index ba92e5619da3..8a1530dab65f 100644
> --- a/drivers/gpu/drm/xe/xe_exec.c
> +++ b/drivers/gpu/drm/xe/xe_exec.c
> @@ -104,7 +104,7 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> struct xe_device *xe = to_xe_device(dev);
> struct xe_file *xef = to_xe_file(file);
> struct drm_xe_exec *args = data;
> - struct drm_xe_sync __user *syncs_user = u64_to_user_ptr(args->syncs);
> + struct drm_xe_sync __user *syncs_user = u64_to_user_ptr(args->syncs.syncs);
> u64 __user *addresses_user = u64_to_user_ptr(args->address);
> struct xe_exec_queue *q;
> struct xe_sync_entry *syncs = NULL;
> @@ -120,7 +120,9 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> int err = 0;
>
> if (XE_IOCTL_DBG(xe, args->extensions) ||
> - XE_IOCTL_DBG(xe, args->pad[0] || args->pad[1] || args->pad[2]) ||
> + XE_IOCTL_DBG(xe, args->pad || args->pad2[0] || args->pad2[1] || args->pad2[2]) ||
> + XE_IOCTL_DBG(xe, args->syncs.flags) ||
> + XE_IOCTL_DBG(xe, args->syncs.cookie) ||
> XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
> return -EINVAL;
>
> @@ -140,8 +142,8 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> goto err_exec_queue;
> }
>
> - if (args->num_syncs) {
> - syncs = kcalloc(args->num_syncs, sizeof(*syncs), GFP_KERNEL);
> + if (args->syncs.num_syncs) {
> + syncs = kcalloc(args->syncs.num_syncs, sizeof(*syncs), GFP_KERNEL);
> if (!syncs) {
> err = -ENOMEM;
> goto err_exec_queue;
> @@ -150,7 +152,7 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
>
> vm = q->vm;
>
> - for (i = 0; i < args->num_syncs; i++) {
> + for (i = 0; i < args->syncs.num_syncs; i++) {
> err = xe_sync_entry_parse(xe, xef, &syncs[num_syncs++],
> &syncs_user[i], SYNC_PARSE_FLAG_EXEC |
> (xe_vm_in_lr_mode(vm) ?
> diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
> index eeb9605dd45f..a25d67971fdd 100644
> --- a/drivers/gpu/drm/xe/xe_exec_queue.c
> +++ b/drivers/gpu/drm/xe/xe_exec_queue.c
> @@ -625,10 +625,7 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
> if (XE_IOCTL_DBG(xe, eci[0].gt_id >= xe->info.gt_count))
> return -EINVAL;
>
> - if (eci[0].engine_class >= DRM_XE_ENGINE_CLASS_VM_BIND_ASYNC) {
> - bool sync = eci[0].engine_class ==
> - DRM_XE_ENGINE_CLASS_VM_BIND_SYNC;
> -
> + if (eci[0].engine_class == DRM_XE_ENGINE_CLASS_VM_BIND) {
> for_each_gt(gt, xe, id) {
> struct xe_exec_queue *new;
>
> @@ -654,8 +651,6 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
> args->width, hwe,
> EXEC_QUEUE_FLAG_PERSISTENT |
> EXEC_QUEUE_FLAG_VM |
> - (sync ? 0 :
> - EXEC_QUEUE_FLAG_VM_ASYNC) |
> (id ?
> EXEC_QUEUE_FLAG_BIND_ENGINE_CHILD :
> 0));
> diff --git a/drivers/gpu/drm/xe/xe_exec_queue_types.h b/drivers/gpu/drm/xe/xe_exec_queue_types.h
> index c7aefa1c8c31..0f7f6cded4a3 100644
> --- a/drivers/gpu/drm/xe/xe_exec_queue_types.h
> +++ b/drivers/gpu/drm/xe/xe_exec_queue_types.h
> @@ -84,8 +84,6 @@ struct xe_exec_queue {
> #define EXEC_QUEUE_FLAG_VM BIT(4)
> /* child of VM queue for multi-tile VM jobs */
> #define EXEC_QUEUE_FLAG_BIND_ENGINE_CHILD BIT(5)
> -/* VM jobs for this queue are asynchronous */
> -#define EXEC_QUEUE_FLAG_VM_ASYNC BIT(6)
>
> /**
> * @flags: flags for this exec queue, should statically setup aside from ban
> diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
> index 2f3df9ee67c9..ab38685d2daf 100644
> --- a/drivers/gpu/drm/xe/xe_vm.c
> +++ b/drivers/gpu/drm/xe/xe_vm.c
> @@ -1343,9 +1343,7 @@ struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags)
> struct xe_gt *gt = tile->primary_gt;
> struct xe_vm *migrate_vm;
> struct xe_exec_queue *q;
> - u32 create_flags = EXEC_QUEUE_FLAG_VM |
> - ((flags & XE_VM_FLAG_ASYNC_DEFAULT) ?
> - EXEC_QUEUE_FLAG_VM_ASYNC : 0);
> + u32 create_flags = EXEC_QUEUE_FLAG_VM;
>
> if (!vm->pt_root[id])
> continue;
> @@ -1712,12 +1710,6 @@ xe_vm_bind_vma(struct xe_vma *vma, struct xe_exec_queue *q,
> return ERR_PTR(err);
> }
>
> -static bool xe_vm_sync_mode(struct xe_vm *vm, struct xe_exec_queue *q)
> -{
> - return q ? !(q->flags & EXEC_QUEUE_FLAG_VM_ASYNC) :
> - !(vm->flags & XE_VM_FLAG_ASYNC_DEFAULT);
> -}
> -
> static int __xe_vm_bind(struct xe_vm *vm, struct xe_vma *vma,
> struct xe_exec_queue *q, struct xe_sync_entry *syncs,
> u32 num_syncs, bool immediate, bool first_op,
> @@ -1747,8 +1739,6 @@ static int __xe_vm_bind(struct xe_vm *vm, struct xe_vma *vma,
>
> if (last_op)
> xe_exec_queue_last_fence_set(wait_exec_queue, vm, fence);
> - if (last_op && xe_vm_sync_mode(vm, q))
> - dma_fence_wait(fence, true);
> dma_fence_put(fence);
>
> return 0;
> @@ -1791,8 +1781,6 @@ static int xe_vm_unbind(struct xe_vm *vm, struct xe_vma *vma,
> xe_vma_destroy(vma, fence);
> if (last_op)
> xe_exec_queue_last_fence_set(wait_exec_queue, vm, fence);
> - if (last_op && xe_vm_sync_mode(vm, q))
> - dma_fence_wait(fence, true);
> dma_fence_put(fence);
>
> return 0;
> @@ -1800,7 +1788,6 @@ static int xe_vm_unbind(struct xe_vm *vm, struct xe_vma *vma,
>
> #define ALL_DRM_XE_VM_CREATE_FLAGS (DRM_XE_VM_CREATE_FLAG_SCRATCH_PAGE | \
> DRM_XE_VM_CREATE_FLAG_LR_MODE | \
> - DRM_XE_VM_CREATE_FLAG_ASYNC_DEFAULT | \
> DRM_XE_VM_CREATE_FLAG_FAULT_MODE)
>
> int xe_vm_create_ioctl(struct drm_device *dev, void *data,
> @@ -1854,8 +1841,6 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
> flags |= XE_VM_FLAG_SCRATCH_PAGE;
> if (args->flags & DRM_XE_VM_CREATE_FLAG_LR_MODE)
> flags |= XE_VM_FLAG_LR_MODE;
> - if (args->flags & DRM_XE_VM_CREATE_FLAG_ASYNC_DEFAULT)
> - flags |= XE_VM_FLAG_ASYNC_DEFAULT;
> if (args->flags & DRM_XE_VM_CREATE_FLAG_FAULT_MODE)
> flags |= XE_VM_FLAG_FAULT_MODE;
>
> @@ -2263,8 +2248,7 @@ static int xe_vma_op_commit(struct xe_vm *vm, struct xe_vma_op *op)
> static int vm_bind_ioctl_ops_parse(struct xe_vm *vm, struct xe_exec_queue *q,
> struct drm_gpuva_ops *ops,
> struct xe_sync_entry *syncs, u32 num_syncs,
> - struct list_head *ops_list, bool last,
> - bool async)
> + struct list_head *ops_list, bool last)
> {
> struct xe_vma_op *last_op = NULL;
> struct drm_gpuva_op *__op;
> @@ -2696,16 +2680,16 @@ static int vm_bind_ioctl_ops_execute(struct xe_vm *vm,
>
> #ifdef TEST_VM_ASYNC_OPS_ERROR
> #define SUPPORTED_FLAGS \
> - (FORCE_ASYNC_OP_ERROR | DRM_XE_VM_BIND_FLAG_ASYNC | \
> - DRM_XE_VM_BIND_FLAG_READONLY | DRM_XE_VM_BIND_FLAG_IMMEDIATE | \
> - DRM_XE_VM_BIND_FLAG_NULL | 0xffff)
> + (FORCE_ASYNC_OP_ERROR | DRM_XE_VM_BIND_FLAG_READONLY | \
> + DRM_XE_VM_BIND_FLAG_IMMEDIATE | DRM_XE_VM_BIND_FLAG_NULL | 0xffff)
> #else
> #define SUPPORTED_FLAGS \
> - (DRM_XE_VM_BIND_FLAG_ASYNC | DRM_XE_VM_BIND_FLAG_READONLY | \
> + (DRM_XE_VM_BIND_FLAG_READONLY | \
> DRM_XE_VM_BIND_FLAG_IMMEDIATE | DRM_XE_VM_BIND_FLAG_NULL | \
> 0xffff)
> #endif
> #define XE_64K_PAGE_MASK 0xffffull
> +#define ALL_DRM_XE_SYNCS_FLAGS (DRM_XE_SYNCS_FLAG_WAIT_FOR_OP)
>
> #define MAX_BINDS 512 /* FIXME: Picking random upper limit */
>
> @@ -2717,7 +2701,7 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe,
> int err;
> int i;
>
> - if (XE_IOCTL_DBG(xe, args->pad || args->pad2) ||
> + if (XE_IOCTL_DBG(xe, args->pad) ||
> XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
> return -EINVAL;
>
> @@ -2745,6 +2729,14 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe,
> *bind_ops = &args->bind;
> }
>
> + *async = !(args->syncs.flags & DRM_XE_SYNCS_FLAG_WAIT_FOR_OP);
> +
> + if (XE_IOCTL_DBG(xe, args->syncs.flags & ~ALL_DRM_XE_SYNCS_FLAGS) ||
> + XE_IOCTL_DBG(xe, !*async && args->syncs.num_syncs)) {
> + err = -EINVAL;
> + goto free_bind_ops;
> + }
> +
> for (i = 0; i < args->num_binds; ++i) {
> u64 range = (*bind_ops)[i].range;
> u64 addr = (*bind_ops)[i].addr;
> @@ -2775,18 +2767,6 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe,
> goto free_bind_ops;
> }
>
> - if (i == 0) {
> - *async = !!(flags & DRM_XE_VM_BIND_FLAG_ASYNC);
> - if (XE_IOCTL_DBG(xe, !*async && args->num_syncs)) {
> - err = -EINVAL;
> - goto free_bind_ops;
> - }
> - } else if (XE_IOCTL_DBG(xe, *async !=
> - !!(flags & DRM_XE_VM_BIND_FLAG_ASYNC))) {
> - err = -EINVAL;
> - goto free_bind_ops;
> - }
> -
> if (XE_IOCTL_DBG(xe, op > DRM_XE_VM_BIND_OP_PREFETCH) ||
> XE_IOCTL_DBG(xe, flags & ~SUPPORTED_FLAGS) ||
> XE_IOCTL_DBG(xe, obj && is_null) ||
> @@ -2854,12 +2834,25 @@ static int vm_bind_ioctl_signal_fences(struct xe_vm *vm,
>
> xe_exec_queue_last_fence_set(to_wait_exec_queue(vm, q), vm,
> fence);
> + dma_fence_put(fence);
>
> - if (xe_vm_sync_mode(vm, q)) {
> - long timeout = dma_fence_wait(fence, true);
> + return err;
> +}
>
> - if (timeout < 0)
> - err = -EINTR;
> +static int vm_bind_ioctl_sync_wait(struct xe_vm *vm,
> + struct dma_fence *fence,
> + u64 __user *cookie)
> +{
> + long timeout;
> + int err = 0;
> +
> + timeout = dma_fence_wait(fence, true);
> + if (timeout < 0) {
> + u64 value = 1;
> +
> + err = -ERESTARTSYS;
> + if (copy_to_user(cookie, &value, sizeof(value)))
> + err = -EFAULT;
> }
>
> dma_fence_put(fence);
> @@ -2875,6 +2868,7 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> struct drm_xe_sync __user *syncs_user;
> struct xe_bo **bos = NULL;
> struct drm_gpuva_ops **ops = NULL;
> + struct dma_fence *fence = NULL;
> struct xe_vm *vm;
> struct xe_exec_queue *q = NULL;
> u32 num_syncs;
> @@ -2889,7 +2883,7 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> if (err)
> return err;
>
> - if (XE_IOCTL_DBG(xe, args->pad || args->pad2) ||
> + if (XE_IOCTL_DBG(xe, args->pad) ||
> XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
> return -EINVAL;
>
> @@ -2904,12 +2898,6 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> err = -EINVAL;
> goto put_exec_queue;
> }
> -
> - if (XE_IOCTL_DBG(xe, args->num_binds && async !=
> - !!(q->flags & EXEC_QUEUE_FLAG_VM_ASYNC))) {
> - err = -EINVAL;
> - goto put_exec_queue;
> - }
> }
>
> vm = xe_vm_lookup(xef, args->vm_id);
> @@ -2918,14 +2906,6 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> goto put_exec_queue;
> }
>
> - if (!args->exec_queue_id) {
> - if (XE_IOCTL_DBG(xe, args->num_binds && async !=
> - !!(vm->flags & XE_VM_FLAG_ASYNC_DEFAULT))) {
> - err = -EINVAL;
> - goto put_vm;
> - }
> - }
> -
> err = down_write_killable(&vm->lock);
> if (err)
> goto put_vm;
> @@ -3015,16 +2995,16 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> }
> }
>
> - if (args->num_syncs) {
> - syncs = kcalloc(args->num_syncs, sizeof(*syncs), GFP_KERNEL);
> + if (args->syncs.num_syncs) {
> + syncs = kcalloc(args->syncs.num_syncs, sizeof(*syncs), GFP_KERNEL);
> if (!syncs) {
> err = -ENOMEM;
> goto put_obj;
> }
> }
>
> - syncs_user = u64_to_user_ptr(args->syncs);
> - for (num_syncs = 0; num_syncs < args->num_syncs; num_syncs++) {
> + syncs_user = u64_to_user_ptr(args->syncs.syncs);
> + for (num_syncs = 0; num_syncs < args->syncs.num_syncs; num_syncs++) {
> err = xe_sync_entry_parse(xe, xef, &syncs[num_syncs],
> &syncs_user[num_syncs],
> (xe_vm_in_lr_mode(vm) ?
> @@ -3060,8 +3040,7 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
>
> err = vm_bind_ioctl_ops_parse(vm, q, ops[i], syncs, num_syncs,
> &ops_list,
> - i == args->num_binds - 1,
> - async);
> + i == args->num_binds - 1);
> if (err)
> goto unwind_ops;
> }
> @@ -3077,7 +3056,10 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> xe_exec_queue_get(q);
>
> err = vm_bind_ioctl_ops_execute(vm, &ops_list);
> -
> + if (!err && !async) {
> + fence = xe_exec_queue_last_fence_get(to_wait_exec_queue(vm, q), vm);
> + dma_fence_get(fence);
> + }
> up_write(&vm->lock);
>
> if (q)
> @@ -3092,13 +3074,19 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> if (args->num_binds > 1)
> kfree(bind_ops);
>
> - return err;
> + return fence ? vm_bind_ioctl_sync_wait(vm, fence, u64_to_user_ptr(args->syncs.cookie)) :
> + err;
>
> unwind_ops:
> vm_bind_ioctl_ops_unwind(vm, ops, args->num_binds);
> free_syncs:
> - if (err == -ENODATA)
> + if (err == -ENODATA) {
> err = vm_bind_ioctl_signal_fences(vm, q, syncs, num_syncs);
> + if (!async) {
> + fence = xe_exec_queue_last_fence_get(to_wait_exec_queue(vm, q), vm);
> + dma_fence_get(fence);
> + }
> + }
> while (num_syncs--)
> xe_sync_entry_cleanup(&syncs[num_syncs]);
>
> @@ -3108,6 +3096,8 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
> xe_bo_put(bos[i]);
> release_vm_lock:
> up_write(&vm->lock);
> + if (fence)
> + err = vm_bind_ioctl_sync_wait(vm, fence, u64_to_user_ptr(args->syncs.cookie));
> put_vm:
> xe_vm_put(vm);
> put_exec_queue:
> diff --git a/drivers/gpu/drm/xe/xe_vm_types.h b/drivers/gpu/drm/xe/xe_vm_types.h
> index 2e023596cb15..63e8a50b88e9 100644
> --- a/drivers/gpu/drm/xe/xe_vm_types.h
> +++ b/drivers/gpu/drm/xe/xe_vm_types.h
> @@ -138,13 +138,12 @@ struct xe_vm {
> */
> #define XE_VM_FLAG_64K BIT(0)
> #define XE_VM_FLAG_LR_MODE BIT(1)
> -#define XE_VM_FLAG_ASYNC_DEFAULT BIT(2)
> -#define XE_VM_FLAG_MIGRATION BIT(3)
> -#define XE_VM_FLAG_SCRATCH_PAGE BIT(4)
> -#define XE_VM_FLAG_FAULT_MODE BIT(5)
> -#define XE_VM_FLAG_BANNED BIT(6)
> -#define XE_VM_FLAG_TILE_ID(flags) FIELD_GET(GENMASK(8, 7), flags)
> -#define XE_VM_FLAG_SET_TILE_ID(tile) FIELD_PREP(GENMASK(8, 7), (tile)->id)
> +#define XE_VM_FLAG_MIGRATION BIT(2)
> +#define XE_VM_FLAG_SCRATCH_PAGE BIT(3)
> +#define XE_VM_FLAG_FAULT_MODE BIT(4)
> +#define XE_VM_FLAG_BANNED BIT(5)
> +#define XE_VM_FLAG_TILE_ID(flags) FIELD_GET(GENMASK(7, 6), flags)
> +#define XE_VM_FLAG_SET_TILE_ID(tile) FIELD_PREP(GENMASK(7, 6), (tile)->id)
> unsigned long flags;
>
> /** @composite_fence_ctx: context composite fence */
> diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
> index 0895e4d2a981..d72e4441cc80 100644
> --- a/include/uapi/drm/xe_drm.h
> +++ b/include/uapi/drm/xe_drm.h
> @@ -140,8 +140,7 @@ struct drm_xe_engine_class_instance {
> * Kernel only classes (not actual hardware engine class). Used for
> * creating ordered queues of VM bind operations.
> */
> -#define DRM_XE_ENGINE_CLASS_VM_BIND_ASYNC 5
> -#define DRM_XE_ENGINE_CLASS_VM_BIND_SYNC 6
> +#define DRM_XE_ENGINE_CLASS_VM_BIND 5
> /** @engine_class: engine class id */
> __u16 engine_class;
> /** @engine_instance: engine instance id */
> @@ -661,7 +660,6 @@ struct drm_xe_vm_create {
> * still enable recoverable pagefaults if supported by the device.
> */
> #define DRM_XE_VM_CREATE_FLAG_LR_MODE (1 << 1)
> -#define DRM_XE_VM_CREATE_FLAG_ASYNC_DEFAULT (1 << 2)
> /*
> * DRM_XE_VM_CREATE_FLAG_FAULT_MODE requires also
> * DRM_XE_VM_CREATE_FLAG_LR_MODE. It allows memory to be allocated
> @@ -669,7 +667,7 @@ struct drm_xe_vm_create {
> * The xe driver internally uses recoverable pagefaults to implement
> * this.
> */
> -#define DRM_XE_VM_CREATE_FLAG_FAULT_MODE (1 << 3)
> +#define DRM_XE_VM_CREATE_FLAG_FAULT_MODE (1 << 2)
> /** @flags: Flags */
> __u32 flags;
>
> @@ -777,12 +775,11 @@ struct drm_xe_vm_bind_op {
> __u32 op;
>
> #define DRM_XE_VM_BIND_FLAG_READONLY (1 << 0)
> -#define DRM_XE_VM_BIND_FLAG_ASYNC (1 << 1)
> /*
> * Valid on a faulting VM only, do the MAP operation immediately rather
> * than deferring the MAP to the page fault handler.
> */
> -#define DRM_XE_VM_BIND_FLAG_IMMEDIATE (1 << 2)
> +#define DRM_XE_VM_BIND_FLAG_IMMEDIATE (1 << 1)
> /*
> * When the NULL flag is set, the page tables are setup with a special
> * bit which indicates writes are dropped and all reads return zero. In
> @@ -790,7 +787,7 @@ struct drm_xe_vm_bind_op {
> * operations, the BO handle MBZ, and the BO offset MBZ. This flag is
> * intended to implement VK sparse bindings.
> */
> -#define DRM_XE_VM_BIND_FLAG_NULL (1 << 3)
> +#define DRM_XE_VM_BIND_FLAG_NULL (1 << 2)
> /** @flags: Bind flags */
> __u32 flags;
>
> @@ -808,6 +805,35 @@ struct drm_xe_vm_bind_op {
> __u64 reserved[3];
> };
>
> +/**
> + * struct drm_xe_syncs - In / out syncs for IOCTLs.
> + */
> +struct drm_xe_syncs {
> + /** @num_syncs: amount of syncs to wait on */
> + __u32 num_syncs;
> +
> + /*
> + * Block in IOCTL until operation complete, num_syncs MBZ if set.
> + */
> +#define DRM_XE_SYNCS_FLAG_WAIT_FOR_OP (1 << 0)
> + /** @flags: Sync flags */
> + __u32 flags;
> +
> + /**
> + * @cookie: pointer which is written with an non-zero value if IOCTL
> + * operation has been committed but the wait for completion
> + * (DRM_XE_SYNCS_FLAG_WAIT_FOR_OP is set) is interrupted. Value only
> + * valid when IOCTL returns -EINTR or -ERESTARTSYS.
> + */
> + __u64 cookie;
what is the usage of cookie?
from what I looked the xe_vm_bind_ioctl() will return -1 and errno will be set to -ERESTARTSYS in the case mentioned in the comment.
if really needed would be nice if you could provide a example of how it should be used.
> +
> + /** @syncs: pointer to struct drm_xe_sync array */
> + __u64 syncs;
> +
> + /** @reserved: Reserved */
> + __u64 reserved[2];
> +};
> +
> struct drm_xe_vm_bind {
> /** @extensions: Pointer to the first extension struct, if any */
> __u64 extensions;
> @@ -839,14 +865,8 @@ struct drm_xe_vm_bind {
> __u64 vector_of_binds;
> };
>
> - /** @pad: MBZ */
> - __u32 pad2;
> -
> - /** @num_syncs: amount of syncs to wait on */
> - __u32 num_syncs;
> -
> - /** @syncs: pointer to struct drm_xe_sync array */
> - __u64 syncs;
> + /** @syncs: syncs for bind */
> + struct drm_xe_syncs syncs;
>
> /** @reserved: Reserved */
> __u64 reserved[2];
> @@ -975,14 +995,14 @@ struct drm_xe_exec {
> /** @extensions: Pointer to the first extension struct, if any */
> __u64 extensions;
>
> + /** @pad: MBZ */
> + __u32 pad;
> +
> /** @exec_queue_id: Exec queue ID for the batch buffer */
> __u32 exec_queue_id;
>
> - /** @num_syncs: Amount of struct drm_xe_sync in array. */
> - __u32 num_syncs;
> -
> - /** @syncs: Pointer to struct drm_xe_sync array. */
> - __u64 syncs;
> + /** @syncs: syncs for exec */
> + struct drm_xe_syncs syncs;
DRM_XE_SYNCS_FLAG_WAIT_FOR_OP is not implemented for DRM_IOCTL_XE_EXEC.
>
> /**
> * @address: address of batch buffer if num_batch_buffer == 1 or an
> @@ -996,8 +1016,8 @@ struct drm_xe_exec {
> */
> __u16 num_batch_buffer;
>
> - /** @pad: MBZ */
> - __u16 pad[3];
> + /** @pad2: MBZ */
> + __u16 pad2[3];
>
> /** @reserved: Reserved */
> __u64 reserved[2];
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