Re: [RFC PATCH v3 08/17] drm/i915/vm_bind: Add out fence support

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On Sat, Aug 27, 2022 at 09:43:54PM +0200, Andi Shyti wrote:
From: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>

Add support for handling out fence of vm_bind call.

Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h   |  3 +
.../drm/i915/gem/i915_gem_vm_bind_object.c    | 82 +++++++++++++++++++
drivers/gpu/drm/i915/i915_vma.c               |  6 +-
drivers/gpu/drm/i915/i915_vma_types.h         |  7 ++
4 files changed, 97 insertions(+), 1 deletion(-)

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 ebc493b7dafc1..d65e6e4fb3972 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h
@@ -18,4 +18,7 @@ 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);
+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 3b45529fe8d4c..e57b9c492a7f9 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
@@ -5,6 +5,8 @@

#include <linux/interval_tree_generic.h>

+#include <drm/drm_syncobj.h>
+
#include "gem/i915_gem_vm_bind.h"
#include "gem/i915_gem_context.h"
#include "gt/gen8_engine_cs.h"
@@ -109,6 +111,67 @@ void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_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");
+		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);
+}
+
+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 i915_vma *vma,
				  struct drm_i915_gem_vm_unbind *va)
@@ -243,6 +306,15 @@ 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;

Setting pin_flags should part of patch #4.

+
	for_i915_gem_ww(&ww, ret, true) {
retry:
		ret = i915_gem_object_lock(vma->obj, &ww);
@@ -267,12 +339,22 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
			ret = i915_gem_ww_ctx_backoff(&ww);
			if (!ret)
				goto retry;
+

Redundent white space. remove.

		} else {
			/* Hold object reference until vm_unbind */
			i915_gem_object_get(vma->obj);
		}
	}

+	if (va->fence.flags & I915_TIMELINE_FENCE_SIGNAL)
+		i915_vm_bind_put_fence(vma);
+
+put_vma:
+	if (ret && vma) {
+		i915_vma_set_freed(vma);
+		i915_vma_destroy(vma);
+	}
+

I think destroying vma upon error should be part of patch #4.

Niranjana

unlock_vm:
	mutex_unlock(&vm->vm_bind_lock);

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 0eb7727d62a6f..6ca37ce2b35a8 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1542,8 +1542,12 @@ 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 5483ccf0c82c7..8bf870a0f689b 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -318,6 +318,13 @@ 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 drm_syncobj *syncobj;
+		u64 value;
+		struct dma_fence_chain *chain_fence;
+	} vm_bind_fence;
+
	/** Interval tree structures for persistent vma */

	/** @rb: node for the interval tree of vm for persistent vmas */
--
2.34.1




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