[PATCH v3 09/17] drm/i915/vm_bind: Add out fence support
Niranjana Vishwanathapura
niranjana.vishwanathapura at intel.com
Mon Oct 10 06:58:18 UTC 2022
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.
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 | 82 +++++++++++++++++++
drivers/gpu/drm/i915/i915_vma.c | 7 +-
drivers/gpu/drm/i915/i915_vma_types.h | 7 ++
include/uapi/drm/i915_drm.h | 63 +++++++++++++-
5 files changed, 158 insertions(+), 5 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 c435d49af2c8..526d3a6bf671 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");
+ 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)
{
@@ -237,6 +309,13 @@ 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;
for_i915_gem_ww(&ww, ret, true) {
@@ -258,6 +337,9 @@ 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 88c09e885fec..cb8e718ec46e 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"
@@ -1572,8 +1573,12 @@ 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 d32c72e8d242..2c740500ac1b 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 16b815875e4f..61b1500866f9 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;
@@ -3817,8 +3852,18 @@ 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.
@@ -3865,8 +3910,18 @@ struct drm_i915_gem_vm_unbind {
*/
__u64 flags;
- /** @rsvd2: Reserved, MBZ */
- __u64 rsvd2[2];
+ /**
+ * @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.
--
2.21.0.rc0.32.g243a4c7e27
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