[PATCH v5 09/19] drm/i915/vm_bind: Add out fence support
Matthew Auld
matthew.auld at intel.com
Wed Oct 26 17:15:09 UTC 2022
On 25/10/2022 07:58, Niranjana Vishwanathapura wrote:
> Add support for handling out fence for vm_bind call.
>
> v2: Reset vma->vm_bind_fence.syncobj to NULL at the end
> of vm_bind call.
> v3: Remove vm_unbind out fence uapi which is not supported yet.
> v4: Return error if I915_TIMELINE_FENCE_WAIT fence flag is set.
> Wait for bind to complete iff I915_TIMELINE_FENCE_SIGNAL is
> not specified.
>
> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 4 +
> .../drm/i915/gem/i915_gem_vm_bind_object.c | 93 +++++++++++++++++++
> drivers/gpu/drm/i915/i915_vma.c | 7 +-
> drivers/gpu/drm/i915/i915_vma_types.h | 7 ++
> include/uapi/drm/i915_drm.h | 49 +++++++++-
> 5 files changed, 157 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
> index 36262a6357b5..b70e900e35ab 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
> @@ -8,6 +8,7 @@
>
> #include <linux/types.h>
>
> +struct dma_fence;
> struct drm_device;
> struct drm_file;
> struct i915_address_space;
> @@ -23,4 +24,7 @@ int i915_gem_vm_unbind_ioctl(struct drm_device *dev, void *data,
>
> void i915_gem_vm_unbind_all(struct i915_address_space *vm);
>
> +void i915_vm_bind_signal_fence(struct i915_vma *vma,
> + struct dma_fence * const fence);
> +
> #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
> index 863bd17c9253..fca6d6eb9ef8 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> @@ -7,6 +7,8 @@
>
> #include <linux/interval_tree_generic.h>
>
> +#include <drm/drm_syncobj.h>
> +
> #include "gem/i915_gem_context.h"
> #include "gem/i915_gem_vm_bind.h"
>
> @@ -100,6 +102,76 @@ static void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj)
> i915_gem_object_put(vma->obj);
> }
>
> +static int i915_vm_bind_add_fence(struct drm_file *file, struct i915_vma *vma,
> + u32 handle, u64 point)
> +{
> + struct drm_syncobj *syncobj;
> +
> + syncobj = drm_syncobj_find(file, handle);
> + if (!syncobj) {
> + DRM_DEBUG("Invalid syncobj handle provided\n");
AFAIK drm_dbg() is preferred, if possible.
> + return -ENOENT;
> + }
> +
> + /*
> + * For timeline syncobjs we need to preallocate chains for
> + * later signaling.
> + */
> + if (point) {
> + vma->vm_bind_fence.chain_fence = dma_fence_chain_alloc();
> + if (!vma->vm_bind_fence.chain_fence) {
> + drm_syncobj_put(syncobj);
> + return -ENOMEM;
> + }
> + } else {
> + vma->vm_bind_fence.chain_fence = NULL;
> + }
> + vma->vm_bind_fence.syncobj = syncobj;
> + vma->vm_bind_fence.value = point;
> +
> + return 0;
> +}
> +
> +static void i915_vm_bind_put_fence(struct i915_vma *vma)
> +{
> + if (!vma->vm_bind_fence.syncobj)
> + return;
> +
> + drm_syncobj_put(vma->vm_bind_fence.syncobj);
> + dma_fence_chain_free(vma->vm_bind_fence.chain_fence);
> + vma->vm_bind_fence.syncobj = NULL;
> +}
> +
> +/**
> + * i915_vm_bind_signal_fence() - Add fence to vm_bind syncobj
> + * @vma: vma mapping requiring signaling
> + * @fence: fence to be added
> + *
> + * Associate specified @fence with the @vma's syncobj to be
> + * signaled after the @fence work completes.
> + */
> +void i915_vm_bind_signal_fence(struct i915_vma *vma,
> + struct dma_fence * const fence)
> +{
> + struct drm_syncobj *syncobj = vma->vm_bind_fence.syncobj;
> +
> + if (!syncobj)
> + return;
> +
> + if (vma->vm_bind_fence.chain_fence) {
> + drm_syncobj_add_point(syncobj,
> + vma->vm_bind_fence.chain_fence,
> + fence, vma->vm_bind_fence.value);
> + /*
> + * The chain's ownership is transferred to the
> + * timeline.
> + */
> + vma->vm_bind_fence.chain_fence = NULL;
> + } else {
> + drm_syncobj_replace_fence(syncobj, fence);
> + }
> +}
> +
> static int i915_gem_vm_unbind_vma(struct i915_address_space *vm,
> struct drm_i915_gem_vm_unbind *va)
> {
> @@ -205,6 +277,10 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
> if (!va->length || !IS_ALIGNED(va->start, I915_GTT_PAGE_SIZE))
> ret = -EINVAL;
>
> + /* In fences are not supported */
> + if (va->fence.flags & I915_TIMELINE_FENCE_WAIT)
> + ret = -EINVAL;
I guess also:
if (flags & __I915_TIMELINE_FENCE_UNKNOWN_FLAGS)
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
> +
> obj = i915_gem_object_lookup(file, va->handle);
> if (!obj)
> return -ENOENT;
> @@ -237,6 +313,13 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
> goto unlock_vm;
> }
>
> + if (va->fence.flags & I915_TIMELINE_FENCE_SIGNAL) {
> + ret = i915_vm_bind_add_fence(file, vma, va->fence.handle,
> + va->fence.value);
> + if (ret)
> + goto put_vma;
> + }
> +
> pin_flags = va->start | PIN_OFFSET_FIXED | PIN_USER |
> PIN_VALIDATE | PIN_NOEVICT;
>
> @@ -249,6 +332,13 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
> if (ret)
> continue;
>
> + /* If out fence is not requested, wait for bind to complete */
> + if (!(va->fence.flags & I915_TIMELINE_FENCE_SIGNAL)) {
> + ret = i915_vma_wait_for_bind(vma);
> + if (ret)
> + continue;
> + }
> +
> list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list);
> i915_vm_bind_it_insert(vma, &vm->va);
> if (!obj->priv_root)
> @@ -259,6 +349,9 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
> i915_gem_object_get(vma->obj);
> }
>
> + if (va->fence.flags & I915_TIMELINE_FENCE_SIGNAL)
> + i915_vm_bind_put_fence(vma);
> +put_vma:
> if (ret)
> i915_vma_destroy(vma);
> unlock_vm:
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index 04abdb92c2b2..eaa13e9ba966 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"
> @@ -1567,8 +1568,12 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
> err_vma_res:
> i915_vma_resource_free(vma_res);
> err_fence:
> - if (work)
> + if (work) {
> + if (i915_vma_is_persistent(vma))
> + i915_vm_bind_signal_fence(vma, &work->base.dma);
> +
> dma_fence_work_commit_imm(&work->base);
> + }
> err_rpm:
> if (wakeref)
> intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
> diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
> index 61d0ec1a4e18..7c8c293ddfcb 100644
> --- a/drivers/gpu/drm/i915/i915_vma_types.h
> +++ b/drivers/gpu/drm/i915/i915_vma_types.h
> @@ -308,6 +308,13 @@ struct i915_vma {
> /** @vm_rebind_link: link to vm_rebind_list and protected by vm_rebind_lock */
> struct list_head vm_rebind_link; /* Link in vm_rebind_list */
>
> + /** Timeline fence for vm_bind completion notification */
> + struct {
> + struct dma_fence_chain *chain_fence;
> + struct drm_syncobj *syncobj;
> + u64 value;
> + } vm_bind_fence;
> +
> /** Interval tree structures for persistent vma */
>
> /** @rb: node for the interval tree of vm for persistent vmas */
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 4383ed85f10a..87f5c2a470f5 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1527,6 +1527,41 @@ 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;
> @@ -3826,8 +3861,18 @@ struct drm_i915_gem_vm_bind {
> */
> __u64 flags;
>
> - /** @rsvd: Reserved, MBZ */
> - __u64 rsvd[2];
> + /**
> + * @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.
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