[PATCH 0/9] Prereqs for TTM accelerated migration

[PATCH 0/9] Prereqs for TTM accelerated migration

[Thomas Hellström]

A couple of patches from Chris which implement pipelined migration and
clears by atomically writing the PTEs in place before performing the
actual blit.

Some ww utilities mainly for the accompanying selftests added by Thomas,
as well as modified the above patches for ww locking- and lmem support.

The actual hook up to the i915 ttm backend is being worked on and not
included yet, so this is considered to be an early review opportunity.

Chris Wilson (6):
  drm/i915/gt: Add an insert_entry for gen8_ppgtt
  drm/i915/gt: Add a routine to iterate over the pagetables of a GTT
  drm/i915/gt: Export the pinned context constructor
  drm/i915/gt: Pipelined page migration
  drm/i915/gt: Pipelined clear
  drm/i915/gt: Setup a default migration context on the GT

Thomas Hellström (3):
  drm/i915: Reference objects on the ww object list
  drm/i915: Break out dma_resv ww locking utilities to separate files
  drm/i915: Introduce a ww transaction helper

 drivers/gpu/drm/i915/Makefile                 |   2 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h    |   9 +-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          |  68 ++
 drivers/gpu/drm/i915/gt/intel_engine.h        |  10 +
 drivers/gpu/drm/i915/gt/intel_engine_cs.c     |  21 +-
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
 drivers/gpu/drm/i915/gt/intel_gt.c            |   4 +
 drivers/gpu/drm/i915/gt/intel_gt_types.h      |   3 +
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   7 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       | 684 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h       |  65 ++
 drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
 drivers/gpu/drm/i915/gt/intel_renderstate.h   |   1 +
 drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 671 +++++++++++++++++
 drivers/gpu/drm/i915/i915_gem.c               |  52 --
 drivers/gpu/drm/i915/i915_gem.h               |  12 -
 drivers/gpu/drm/i915/i915_gem_ww.c            |  63 ++
 drivers/gpu/drm/i915/i915_gem_ww.h            |  50 ++
 .../drm/i915/selftests/i915_live_selftests.h  |   1 +
 .../drm/i915/selftests/i915_perf_selftests.h  |   1 +
 21 files changed, 1669 insertions(+), 73 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
 create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h

-- 
2.31.1

[Intel-gfx] [PATCH 0/9] Prereqs for TTM accelerated migration

[Thomas Hellström]

A couple of patches from Chris which implement pipelined migration and
clears by atomically writing the PTEs in place before performing the
actual blit.

Some ww utilities mainly for the accompanying selftests added by Thomas,
as well as modified the above patches for ww locking- and lmem support.

The actual hook up to the i915 ttm backend is being worked on and not
included yet, so this is considered to be an early review opportunity.

Chris Wilson (6):
  drm/i915/gt: Add an insert_entry for gen8_ppgtt
  drm/i915/gt: Add a routine to iterate over the pagetables of a GTT
  drm/i915/gt: Export the pinned context constructor
  drm/i915/gt: Pipelined page migration
  drm/i915/gt: Pipelined clear
  drm/i915/gt: Setup a default migration context on the GT

Thomas Hellström (3):
  drm/i915: Reference objects on the ww object list
  drm/i915: Break out dma_resv ww locking utilities to separate files
  drm/i915: Introduce a ww transaction helper

 drivers/gpu/drm/i915/Makefile                 |   2 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h    |   9 +-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c          |  68 ++
 drivers/gpu/drm/i915/gt/intel_engine.h        |  10 +
 drivers/gpu/drm/i915/gt/intel_engine_cs.c     |  21 +-
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
 drivers/gpu/drm/i915/gt/intel_gt.c            |   4 +
 drivers/gpu/drm/i915/gt/intel_gt_types.h      |   3 +
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   7 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       | 684 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h       |  65 ++
 drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
 drivers/gpu/drm/i915/gt/intel_renderstate.h   |   1 +
 drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 671 +++++++++++++++++
 drivers/gpu/drm/i915/i915_gem.c               |  52 --
 drivers/gpu/drm/i915/i915_gem.h               |  12 -
 drivers/gpu/drm/i915/i915_gem_ww.c            |  63 ++
 drivers/gpu/drm/i915/i915_gem_ww.h            |  50 ++
 .../drm/i915/selftests/i915_live_selftests.h  |   1 +
 .../drm/i915/selftests/i915_perf_selftests.h  |   1 +
 21 files changed, 1669 insertions(+), 73 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
 create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h

-- 
2.31.1

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[PATCH 1/9] drm/i915: Reference objects on the ww object list

[Thomas Hellström]

Since the ww transaction endpoint easily end up far out-of-scope of
the objects on the ww object list, particularly for contending lock
objects, make sure we reference objects on the list so they don't
disappear under us.

This comes with a performance penalty so it's been debated whether this
is really needed. But I think this is motivated by the fact that locking
is typically difficult to get right, and whatever we can do to make it
simpler for developers moving forward should be done, unless the
performance impact is far too high.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.h | 8 ++++++--
 drivers/gpu/drm/i915/i915_gem.c            | 4 ++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 7c0eb425cb3b..1fafcc89ecee 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -169,13 +169,17 @@ static inline int __i915_gem_object_lock(struct drm_i915_gem_object *obj,
 	else
 		ret = dma_resv_lock(obj->base.resv, ww ? &ww->ctx : NULL);
 
-	if (!ret && ww)
+	if (!ret && ww) {
+		i915_gem_object_get(obj);
 		list_add_tail(&obj->obj_link, &ww->obj_list);
+	}
 	if (ret == -EALREADY)
 		ret = 0;
 
-	if (ret == -EDEADLK)
+	if (ret == -EDEADLK) {
+		i915_gem_object_get(obj);
 		ww->contended = obj;
+	}
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 589388dec48a..3f060ab58c5d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1219,6 +1219,7 @@ static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
 	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
 		list_del(&obj->obj_link);
 		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
 	}
 }
 
@@ -1226,6 +1227,7 @@ void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
 {
 	list_del(&obj->obj_link);
 	i915_gem_object_unlock(obj);
+	i915_gem_object_put(obj);
 }
 
 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
@@ -1250,6 +1252,8 @@ int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
 
 	if (!ret)
 		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
+	else
+		i915_gem_object_put(ww->contended);
 
 	ww->contended = NULL;
 
-- 
2.31.1

[Intel-gfx] [PATCH 1/9] drm/i915: Reference objects on the ww object list

[Thomas Hellström]

Since the ww transaction endpoint easily end up far out-of-scope of
the objects on the ww object list, particularly for contending lock
objects, make sure we reference objects on the list so they don't
disappear under us.

This comes with a performance penalty so it's been debated whether this
is really needed. But I think this is motivated by the fact that locking
is typically difficult to get right, and whatever we can do to make it
simpler for developers moving forward should be done, unless the
performance impact is far too high.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.h | 8 ++++++--
 drivers/gpu/drm/i915/i915_gem.c            | 4 ++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 7c0eb425cb3b..1fafcc89ecee 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -169,13 +169,17 @@ static inline int __i915_gem_object_lock(struct drm_i915_gem_object *obj,
 	else
 		ret = dma_resv_lock(obj->base.resv, ww ? &ww->ctx : NULL);
 
-	if (!ret && ww)
+	if (!ret && ww) {
+		i915_gem_object_get(obj);
 		list_add_tail(&obj->obj_link, &ww->obj_list);
+	}
 	if (ret == -EALREADY)
 		ret = 0;
 
-	if (ret == -EDEADLK)
+	if (ret == -EDEADLK) {
+		i915_gem_object_get(obj);
 		ww->contended = obj;
+	}
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 589388dec48a..3f060ab58c5d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1219,6 +1219,7 @@ static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
 	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
 		list_del(&obj->obj_link);
 		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
 	}
 }
 
@@ -1226,6 +1227,7 @@ void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
 {
 	list_del(&obj->obj_link);
 	i915_gem_object_unlock(obj);
+	i915_gem_object_put(obj);
 }
 
 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
@@ -1250,6 +1252,8 @@ int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
 
 	if (!ret)
 		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
+	else
+		i915_gem_object_put(ww->contended);
 
 	ww->contended = NULL;
 
-- 
2.31.1

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Re: [PATCH 1/9] drm/i915: Reference objects on the ww object list

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> Since the ww transaction endpoint easily end up far out-of-scope of
> the objects on the ww object list, particularly for contending lock
> objects, make sure we reference objects on the list so they don't
> disappear under us.
>
> This comes with a performance penalty so it's been debated whether this
> is really needed. But I think this is motivated by the fact that locking
> is typically difficult to get right, and whatever we can do to make it
> simpler for developers moving forward should be done, unless the
> performance impact is far too high.
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

Re: [Intel-gfx] [PATCH 1/9] drm/i915: Reference objects on the ww object list

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> Since the ww transaction endpoint easily end up far out-of-scope of
> the objects on the ww object list, particularly for contending lock
> objects, make sure we reference objects on the list so they don't
> disappear under us.
>
> This comes with a performance penalty so it's been debated whether this
> is really needed. But I think this is motivated by the fact that locking
> is typically difficult to get right, and whatever we can do to make it
> simpler for developers moving forward should be done, unless the
> performance impact is far too high.
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
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[PATCH 2/9] drm/i915: Break out dma_resv ww locking utilities to separate files

[Thomas Hellström]

As we're about to add more ww-related functionality,
break out the dma_resv ww locking utilities to their own files

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile               |  1 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h  |  1 +
 drivers/gpu/drm/i915/gt/intel_renderstate.h |  1 +
 drivers/gpu/drm/i915/i915_gem.c             | 56 ------------------
 drivers/gpu/drm/i915/i915_gem.h             | 12 ----
 drivers/gpu/drm/i915/i915_gem_ww.c          | 63 +++++++++++++++++++++
 drivers/gpu/drm/i915/i915_gem_ww.h          | 21 +++++++
 7 files changed, 87 insertions(+), 68 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 4f22cac1c49b..ea8ee4b3e018 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -45,6 +45,7 @@ i915-y += i915_drv.o \
 	  i915_switcheroo.o \
 	  i915_sysfs.o \
 	  i915_utils.o \
+	  i915_gem_ww.o \
 	  intel_device_info.o \
 	  intel_dram.o \
 	  intel_memory_region.o \
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 1fafcc89ecee..789529b424c1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -15,6 +15,7 @@
 #include "i915_gem_object_types.h"
 #include "i915_gem_gtt.h"
 #include "i915_vma_types.h"
+#include "i915_gem_ww.h"
 
 /*
  * XXX: There is a prevalence of the assumption that we fit the
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h
index 48f009203917..4da4c5234ef0 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.h
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h
@@ -8,6 +8,7 @@
 
 #include <linux/types.h>
 #include "i915_gem.h"
+#include "i915_gem_ww.h"
 
 struct i915_request;
 struct intel_context;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3f060ab58c5d..ce64d3005cf2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1204,62 +1204,6 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
 	return ret;
 }
 
-void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)
-{
-	ww_acquire_init(&ww->ctx, &reservation_ww_class);
-	INIT_LIST_HEAD(&ww->obj_list);
-	ww->intr = intr;
-	ww->contended = NULL;
-}
-
-static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
-{
-	struct drm_i915_gem_object *obj;
-
-	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
-		list_del(&obj->obj_link);
-		i915_gem_object_unlock(obj);
-		i915_gem_object_put(obj);
-	}
-}
-
-void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
-{
-	list_del(&obj->obj_link);
-	i915_gem_object_unlock(obj);
-	i915_gem_object_put(obj);
-}
-
-void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
-{
-	i915_gem_ww_ctx_unlock_all(ww);
-	WARN_ON(ww->contended);
-	ww_acquire_fini(&ww->ctx);
-}
-
-int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
-{
-	int ret = 0;
-
-	if (WARN_ON(!ww->contended))
-		return -EINVAL;
-
-	i915_gem_ww_ctx_unlock_all(ww);
-	if (ww->intr)
-		ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);
-	else
-		dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);
-
-	if (!ret)
-		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
-	else
-		i915_gem_object_put(ww->contended);
-
-	ww->contended = NULL;
-
-	return ret;
-}
-
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/mock_gem_device.c"
 #include "selftests/i915_gem.c"
diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index 440c35f1abc9..d0752e5553db 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -123,16 +123,4 @@ static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
 	return test_bit(TASKLET_STATE_SCHED, &t->state);
 }
 
-struct i915_gem_ww_ctx {
-	struct ww_acquire_ctx ctx;
-	struct list_head obj_list;
-	bool intr;
-	struct drm_i915_gem_object *contended;
-};
-
-void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
-void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
-int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
-void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
-
 #endif /* __I915_GEM_H__ */
diff --git a/drivers/gpu/drm/i915/i915_gem_ww.c b/drivers/gpu/drm/i915/i915_gem_ww.c
new file mode 100644
index 000000000000..3f6ff139478e
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#include <linux/dma-resv.h>
+#include "i915_gem_ww.h"
+#include "gem/i915_gem_object.h"
+
+void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)
+{
+	ww_acquire_init(&ww->ctx, &reservation_ww_class);
+	INIT_LIST_HEAD(&ww->obj_list);
+	ww->intr = intr;
+	ww->contended = NULL;
+}
+
+static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
+{
+	struct drm_i915_gem_object *obj;
+
+	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
+		list_del(&obj->obj_link);
+		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
+	}
+}
+
+void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
+{
+	list_del(&obj->obj_link);
+	i915_gem_object_unlock(obj);
+	i915_gem_object_put(obj);
+}
+
+void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
+{
+	i915_gem_ww_ctx_unlock_all(ww);
+	WARN_ON(ww->contended);
+	ww_acquire_fini(&ww->ctx);
+}
+
+int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
+{
+	int ret = 0;
+
+	if (WARN_ON(!ww->contended))
+		return -EINVAL;
+
+	i915_gem_ww_ctx_unlock_all(ww);
+	if (ww->intr)
+		ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);
+	else
+		dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);
+
+	if (!ret)
+		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
+	else
+		i915_gem_object_put(ww->contended);
+
+	ww->contended = NULL;
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
new file mode 100644
index 000000000000..f2d8769e4118
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#ifndef __I915_GEM_WW_H__
+#define __I915_GEM_WW_H__
+
+#include <drm/drm_drv.h>
+
+struct i915_gem_ww_ctx {
+	struct ww_acquire_ctx ctx;
+	struct list_head obj_list;
+	struct drm_i915_gem_object *contended;
+	bool intr;
+};
+
+void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
+void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
+int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
+void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
+#endif
-- 
2.31.1

[Intel-gfx] [PATCH 2/9] drm/i915: Break out dma_resv ww locking utilities to separate files

[Thomas Hellström]

As we're about to add more ww-related functionality,
break out the dma_resv ww locking utilities to their own files

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile               |  1 +
 drivers/gpu/drm/i915/gem/i915_gem_object.h  |  1 +
 drivers/gpu/drm/i915/gt/intel_renderstate.h |  1 +
 drivers/gpu/drm/i915/i915_gem.c             | 56 ------------------
 drivers/gpu/drm/i915/i915_gem.h             | 12 ----
 drivers/gpu/drm/i915/i915_gem_ww.c          | 63 +++++++++++++++++++++
 drivers/gpu/drm/i915/i915_gem_ww.h          | 21 +++++++
 7 files changed, 87 insertions(+), 68 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 4f22cac1c49b..ea8ee4b3e018 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -45,6 +45,7 @@ i915-y += i915_drv.o \
 	  i915_switcheroo.o \
 	  i915_sysfs.o \
 	  i915_utils.o \
+	  i915_gem_ww.o \
 	  intel_device_info.o \
 	  intel_dram.o \
 	  intel_memory_region.o \
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 1fafcc89ecee..789529b424c1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -15,6 +15,7 @@
 #include "i915_gem_object_types.h"
 #include "i915_gem_gtt.h"
 #include "i915_vma_types.h"
+#include "i915_gem_ww.h"
 
 /*
  * XXX: There is a prevalence of the assumption that we fit the
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h
index 48f009203917..4da4c5234ef0 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.h
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h
@@ -8,6 +8,7 @@
 
 #include <linux/types.h>
 #include "i915_gem.h"
+#include "i915_gem_ww.h"
 
 struct i915_request;
 struct intel_context;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3f060ab58c5d..ce64d3005cf2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1204,62 +1204,6 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
 	return ret;
 }
 
-void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)
-{
-	ww_acquire_init(&ww->ctx, &reservation_ww_class);
-	INIT_LIST_HEAD(&ww->obj_list);
-	ww->intr = intr;
-	ww->contended = NULL;
-}
-
-static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
-{
-	struct drm_i915_gem_object *obj;
-
-	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
-		list_del(&obj->obj_link);
-		i915_gem_object_unlock(obj);
-		i915_gem_object_put(obj);
-	}
-}
-
-void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
-{
-	list_del(&obj->obj_link);
-	i915_gem_object_unlock(obj);
-	i915_gem_object_put(obj);
-}
-
-void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
-{
-	i915_gem_ww_ctx_unlock_all(ww);
-	WARN_ON(ww->contended);
-	ww_acquire_fini(&ww->ctx);
-}
-
-int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
-{
-	int ret = 0;
-
-	if (WARN_ON(!ww->contended))
-		return -EINVAL;
-
-	i915_gem_ww_ctx_unlock_all(ww);
-	if (ww->intr)
-		ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);
-	else
-		dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);
-
-	if (!ret)
-		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
-	else
-		i915_gem_object_put(ww->contended);
-
-	ww->contended = NULL;
-
-	return ret;
-}
-
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/mock_gem_device.c"
 #include "selftests/i915_gem.c"
diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index 440c35f1abc9..d0752e5553db 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -123,16 +123,4 @@ static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
 	return test_bit(TASKLET_STATE_SCHED, &t->state);
 }
 
-struct i915_gem_ww_ctx {
-	struct ww_acquire_ctx ctx;
-	struct list_head obj_list;
-	bool intr;
-	struct drm_i915_gem_object *contended;
-};
-
-void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
-void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
-int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
-void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
-
 #endif /* __I915_GEM_H__ */
diff --git a/drivers/gpu/drm/i915/i915_gem_ww.c b/drivers/gpu/drm/i915/i915_gem_ww.c
new file mode 100644
index 000000000000..3f6ff139478e
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#include <linux/dma-resv.h>
+#include "i915_gem_ww.h"
+#include "gem/i915_gem_object.h"
+
+void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)
+{
+	ww_acquire_init(&ww->ctx, &reservation_ww_class);
+	INIT_LIST_HEAD(&ww->obj_list);
+	ww->intr = intr;
+	ww->contended = NULL;
+}
+
+static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
+{
+	struct drm_i915_gem_object *obj;
+
+	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
+		list_del(&obj->obj_link);
+		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
+	}
+}
+
+void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
+{
+	list_del(&obj->obj_link);
+	i915_gem_object_unlock(obj);
+	i915_gem_object_put(obj);
+}
+
+void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
+{
+	i915_gem_ww_ctx_unlock_all(ww);
+	WARN_ON(ww->contended);
+	ww_acquire_fini(&ww->ctx);
+}
+
+int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
+{
+	int ret = 0;
+
+	if (WARN_ON(!ww->contended))
+		return -EINVAL;
+
+	i915_gem_ww_ctx_unlock_all(ww);
+	if (ww->intr)
+		ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);
+	else
+		dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);
+
+	if (!ret)
+		list_add_tail(&ww->contended->obj_link, &ww->obj_list);
+	else
+		i915_gem_object_put(ww->contended);
+
+	ww->contended = NULL;
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
new file mode 100644
index 000000000000..f2d8769e4118
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#ifndef __I915_GEM_WW_H__
+#define __I915_GEM_WW_H__
+
+#include <drm/drm_drv.h>
+
+struct i915_gem_ww_ctx {
+	struct ww_acquire_ctx ctx;
+	struct list_head obj_list;
+	struct drm_i915_gem_object *contended;
+	bool intr;
+};
+
+void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
+void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
+int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
+void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
+#endif
-- 
2.31.1

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Re: [PATCH 2/9] drm/i915: Break out dma_resv ww locking utilities to separate files

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> As we're about to add more ww-related functionality,
> break out the dma_resv ww locking utilities to their own files
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile               |  1 +
>  drivers/gpu/drm/i915/gem/i915_gem_object.h  |  1 +
>  drivers/gpu/drm/i915/gt/intel_renderstate.h |  1 +
>  drivers/gpu/drm/i915/i915_gem.c             | 56 ------------------
>  drivers/gpu/drm/i915/i915_gem.h             | 12 ----
>  drivers/gpu/drm/i915/i915_gem_ww.c          | 63 +++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_gem_ww.h          | 21 +++++++
>  7 files changed, 87 insertions(+), 68 deletions(-)
>  create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
>  create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 4f22cac1c49b..ea8ee4b3e018 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -45,6 +45,7 @@ i915-y += i915_drv.o \
>           i915_switcheroo.o \
>           i915_sysfs.o \
>           i915_utils.o \
> +         i915_gem_ww.o \

Nit: Should be kept sorted.

>           intel_device_info.o \
>           intel_dram.o \
>           intel_memory_region.o \
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> index 1fafcc89ecee..789529b424c1 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> @@ -15,6 +15,7 @@
>  #include "i915_gem_object_types.h"
>  #include "i915_gem_gtt.h"
>  #include "i915_vma_types.h"
> +#include "i915_gem_ww.h"

Same here.

Reviewed-by: Matthew Auld <matthew.auld@intel.com>

Re: [Intel-gfx] [PATCH 2/9] drm/i915: Break out dma_resv ww locking utilities to separate files

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> As we're about to add more ww-related functionality,
> break out the dma_resv ww locking utilities to their own files
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile               |  1 +
>  drivers/gpu/drm/i915/gem/i915_gem_object.h  |  1 +
>  drivers/gpu/drm/i915/gt/intel_renderstate.h |  1 +
>  drivers/gpu/drm/i915/i915_gem.c             | 56 ------------------
>  drivers/gpu/drm/i915/i915_gem.h             | 12 ----
>  drivers/gpu/drm/i915/i915_gem_ww.c          | 63 +++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_gem_ww.h          | 21 +++++++
>  7 files changed, 87 insertions(+), 68 deletions(-)
>  create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
>  create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 4f22cac1c49b..ea8ee4b3e018 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -45,6 +45,7 @@ i915-y += i915_drv.o \
>           i915_switcheroo.o \
>           i915_sysfs.o \
>           i915_utils.o \
> +         i915_gem_ww.o \

Nit: Should be kept sorted.

>           intel_device_info.o \
>           intel_dram.o \
>           intel_memory_region.o \
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> index 1fafcc89ecee..789529b424c1 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> @@ -15,6 +15,7 @@
>  #include "i915_gem_object_types.h"
>  #include "i915_gem_gtt.h"
>  #include "i915_vma_types.h"
> +#include "i915_gem_ww.h"

Same here.

Reviewed-by: Matthew Auld <matthew.auld@intel.com>
_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Thomas Hellström]

Introduce a for_i915_gem_ww(){} utility to help make the code
around a ww transaction more readable.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem_ww.h | 31 +++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
index f2d8769e4118..f6b1a796667b 100644
--- a/drivers/gpu/drm/i915/i915_gem_ww.h
+++ b/drivers/gpu/drm/i915/i915_gem_ww.h
@@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
 	struct ww_acquire_ctx ctx;
 	struct list_head obj_list;
 	struct drm_i915_gem_object *contended;
-	bool intr;
+	unsigned short intr;
+	unsigned short loop;
 };
 
 void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
 int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
 void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
+
+/* Internal functions used by the inlines! Don't use. */
+static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
+{
+	ww->loop = 0;
+	if (err == -EDEADLK) {
+		err = i915_gem_ww_ctx_backoff(ww);
+		if (!err)
+			ww->loop = 1;
+	}
+
+	if (!ww->loop)
+		i915_gem_ww_ctx_fini(ww);
+
+	return err;
+}
+
+static inline void
+__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
+{
+	i915_gem_ww_ctx_init(ww, intr);
+	ww->loop = 1;
+}
+
+#define for_i915_gem_ww(_ww, _err, _intr)			\
+	for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;	\
+	     _err = __i915_gem_ww_fini(_ww, _err))
+
 #endif
-- 
2.31.1

[Intel-gfx] [PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Thomas Hellström]

Introduce a for_i915_gem_ww(){} utility to help make the code
around a ww transaction more readable.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem_ww.h | 31 +++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
index f2d8769e4118..f6b1a796667b 100644
--- a/drivers/gpu/drm/i915/i915_gem_ww.h
+++ b/drivers/gpu/drm/i915/i915_gem_ww.h
@@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
 	struct ww_acquire_ctx ctx;
 	struct list_head obj_list;
 	struct drm_i915_gem_object *contended;
-	bool intr;
+	unsigned short intr;
+	unsigned short loop;
 };
 
 void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
 int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
 void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
+
+/* Internal functions used by the inlines! Don't use. */
+static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
+{
+	ww->loop = 0;
+	if (err == -EDEADLK) {
+		err = i915_gem_ww_ctx_backoff(ww);
+		if (!err)
+			ww->loop = 1;
+	}
+
+	if (!ww->loop)
+		i915_gem_ww_ctx_fini(ww);
+
+	return err;
+}
+
+static inline void
+__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
+{
+	i915_gem_ww_ctx_init(ww, intr);
+	ww->loop = 1;
+}
+
+#define for_i915_gem_ww(_ww, _err, _intr)			\
+	for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;	\
+	     _err = __i915_gem_ww_fini(_ww, _err))
+
 #endif
-- 
2.31.1

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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> Introduce a for_i915_gem_ww(){} utility to help make the code
> around a ww transaction more readable.
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_ww.h | 31 +++++++++++++++++++++++++++++-
>  1 file changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
> index f2d8769e4118..f6b1a796667b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_ww.h
> +++ b/drivers/gpu/drm/i915/i915_gem_ww.h
> @@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
>         struct ww_acquire_ctx ctx;
>         struct list_head obj_list;
>         struct drm_i915_gem_object *contended;
> -       bool intr;
> +       unsigned short intr;
> +       unsigned short loop;

Why are these now unsigned short?

Reviewed-by: Matthew Auld <matthew.auld@intel.com>

>  };
>
>  void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
>  void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
>  int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
>  void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
> +
> +/* Internal functions used by the inlines! Don't use. */
> +static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
> +{
> +       ww->loop = 0;
> +       if (err == -EDEADLK) {
> +               err = i915_gem_ww_ctx_backoff(ww);
> +               if (!err)
> +                       ww->loop = 1;
> +       }
> +
> +       if (!ww->loop)
> +               i915_gem_ww_ctx_fini(ww);
> +
> +       return err;
> +}
> +
> +static inline void
> +__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
> +{
> +       i915_gem_ww_ctx_init(ww, intr);
> +       ww->loop = 1;
> +}
> +
> +#define for_i915_gem_ww(_ww, _err, _intr)                      \
> +       for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;       \
> +            _err = __i915_gem_ww_fini(_ww, _err))
> +
>  #endif
> --
> 2.31.1
>
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> Introduce a for_i915_gem_ww(){} utility to help make the code
> around a ww transaction more readable.
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_ww.h | 31 +++++++++++++++++++++++++++++-
>  1 file changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
> index f2d8769e4118..f6b1a796667b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_ww.h
> +++ b/drivers/gpu/drm/i915/i915_gem_ww.h
> @@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
>         struct ww_acquire_ctx ctx;
>         struct list_head obj_list;
>         struct drm_i915_gem_object *contended;
> -       bool intr;
> +       unsigned short intr;
> +       unsigned short loop;

Why are these now unsigned short?

Reviewed-by: Matthew Auld <matthew.auld@intel.com>

>  };
>
>  void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
>  void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
>  int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
>  void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
> +
> +/* Internal functions used by the inlines! Don't use. */
> +static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
> +{
> +       ww->loop = 0;
> +       if (err == -EDEADLK) {
> +               err = i915_gem_ww_ctx_backoff(ww);
> +               if (!err)
> +                       ww->loop = 1;
> +       }
> +
> +       if (!ww->loop)
> +               i915_gem_ww_ctx_fini(ww);
> +
> +       return err;
> +}
> +
> +static inline void
> +__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
> +{
> +       i915_gem_ww_ctx_init(ww, intr);
> +       ww->loop = 1;
> +}
> +
> +#define for_i915_gem_ww(_ww, _err, _intr)                      \
> +       for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;       \
> +            _err = __i915_gem_ww_fini(_ww, _err))
> +
>  #endif
> --
> 2.31.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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Re: [Intel-gfx] [PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Thomas Hellström]

On Tue, 2021-06-08 at 18:17 +0100, Matthew Auld wrote:
> On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
> <thomas.hellstrom@linux.intel.com> wrote:
> > 
> > Introduce a for_i915_gem_ww(){} utility to help make the code
> > around a ww transaction more readable.
> > 
> > Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_ww.h | 31
> > +++++++++++++++++++++++++++++-
> >  1 file changed, 30 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h
> > b/drivers/gpu/drm/i915/i915_gem_ww.h
> > index f2d8769e4118..f6b1a796667b 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_ww.h
> > +++ b/drivers/gpu/drm/i915/i915_gem_ww.h
> > @@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
> >         struct ww_acquire_ctx ctx;
> >         struct list_head obj_list;
> >         struct drm_i915_gem_object *contended;
> > -       bool intr;
> > +       unsigned short intr;
> > +       unsigned short loop;
> 
> Why are these now unsigned short?
> 
That's because I once got a harsh comment making some changes to the
core mutex code where I happened to stuff bools in the struct ww_mutex,
and was told that it was bad style putting bools in compound data types
in the linux kernel.

There's no checkpatch.pl checks for that though...

> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
> 
> >  };
> > 
> >  void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
> >  void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
> >  int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx
> > *ctx);
> >  void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
> > +
> > +/* Internal functions used by the inlines! Don't use. */
> > +static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww,
> > int err)
> > +{
> > +       ww->loop = 0;
> > +       if (err == -EDEADLK) {
> > +               err = i915_gem_ww_ctx_backoff(ww);
> > +               if (!err)
> > +                       ww->loop = 1;
> > +       }
> > +
> > +       if (!ww->loop)
> > +               i915_gem_ww_ctx_fini(ww);
> > +
> > +       return err;
> > +}
> > +
> > +static inline void
> > +__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
> > +{
> > +       i915_gem_ww_ctx_init(ww, intr);
> > +       ww->loop = 1;
> > +}
> > +
> > +#define for_i915_gem_ww(_ww, _err, _intr)                      \
> > +       for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;       \
> > +            _err = __i915_gem_ww_fini(_ww, _err))
> > +
> >  #endif
> > --
> > 2.31.1
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 3/9] drm/i915: Introduce a ww transaction helper

[Thomas Hellström]

On Tue, 2021-06-08 at 18:17 +0100, Matthew Auld wrote:
> On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
> <thomas.hellstrom@linux.intel.com> wrote:
> > 
> > Introduce a for_i915_gem_ww(){} utility to help make the code
> > around a ww transaction more readable.
> > 
> > Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_ww.h | 31
> > +++++++++++++++++++++++++++++-
> >  1 file changed, 30 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h
> > b/drivers/gpu/drm/i915/i915_gem_ww.h
> > index f2d8769e4118..f6b1a796667b 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_ww.h
> > +++ b/drivers/gpu/drm/i915/i915_gem_ww.h
> > @@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
> >         struct ww_acquire_ctx ctx;
> >         struct list_head obj_list;
> >         struct drm_i915_gem_object *contended;
> > -       bool intr;
> > +       unsigned short intr;
> > +       unsigned short loop;
> 
> Why are these now unsigned short?
> 
That's because I once got a harsh comment making some changes to the
core mutex code where I happened to stuff bools in the struct ww_mutex,
and was told that it was bad style putting bools in compound data types
in the linux kernel.

There's no checkpatch.pl checks for that though...

> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
> 
> >  };
> > 
> >  void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
> >  void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
> >  int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx
> > *ctx);
> >  void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
> > +
> > +/* Internal functions used by the inlines! Don't use. */
> > +static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww,
> > int err)
> > +{
> > +       ww->loop = 0;
> > +       if (err == -EDEADLK) {
> > +               err = i915_gem_ww_ctx_backoff(ww);
> > +               if (!err)
> > +                       ww->loop = 1;
> > +       }
> > +
> > +       if (!ww->loop)
> > +               i915_gem_ww_ctx_fini(ww);
> > +
> > +       return err;
> > +}
> > +
> > +static inline void
> > +__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
> > +{
> > +       i915_gem_ww_ctx_init(ww, intr);
> > +       ww->loop = 1;
> > +}
> > +
> > +#define for_i915_gem_ww(_ww, _err, _intr)                      \
> > +       for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;       \
> > +            _err = __i915_gem_ww_fini(_ww, _err))
> > +
> >  #endif
> > --
> > 2.31.1
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx


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[PATCH 4/9] drm/i915/gt: Add an insert_entry for gen8_ppgtt

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

In the next patch, we will want to write a PTE for an explicit
dma address, outside of the usual vma.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 21c8b7350b7a..1b676d7700bf 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -555,6 +555,24 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	}
 }
 
+static void gen8_ppgtt_insert_entry(struct i915_address_space *vm,
+				    dma_addr_t addr,
+				    u64 offset,
+				    enum i915_cache_level level,
+				    u32 flags)
+{
+	u64 idx = offset >> GEN8_PTE_SHIFT;
+	struct i915_page_directory * const pdp =
+		gen8_pdp_for_page_index(vm, idx);
+	struct i915_page_directory *pd =
+		i915_pd_entry(pdp, gen8_pd_index(idx, 2));
+	gen8_pte_t *vaddr;
+
+	vaddr = px_vaddr(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+	vaddr[gen8_pd_index(idx, 0)] = gen8_pte_encode(addr, level, flags);
+	clflush_cache_range(&vaddr[gen8_pd_index(idx, 0)], sizeof(*vaddr));
+}
+
 static int gen8_init_scratch(struct i915_address_space *vm)
 {
 	u32 pte_flags;
@@ -734,6 +752,7 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
 
 	ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
 	ppgtt->vm.insert_entries = gen8_ppgtt_insert;
+	ppgtt->vm.insert_page = gen8_ppgtt_insert_entry;
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
 
-- 
2.31.1

[Intel-gfx] [PATCH 4/9] drm/i915/gt: Add an insert_entry for gen8_ppgtt

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

In the next patch, we will want to write a PTE for an explicit
dma address, outside of the usual vma.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 21c8b7350b7a..1b676d7700bf 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -555,6 +555,24 @@ static void gen8_ppgtt_insert(struct i915_address_space *vm,
 	}
 }
 
+static void gen8_ppgtt_insert_entry(struct i915_address_space *vm,
+				    dma_addr_t addr,
+				    u64 offset,
+				    enum i915_cache_level level,
+				    u32 flags)
+{
+	u64 idx = offset >> GEN8_PTE_SHIFT;
+	struct i915_page_directory * const pdp =
+		gen8_pdp_for_page_index(vm, idx);
+	struct i915_page_directory *pd =
+		i915_pd_entry(pdp, gen8_pd_index(idx, 2));
+	gen8_pte_t *vaddr;
+
+	vaddr = px_vaddr(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
+	vaddr[gen8_pd_index(idx, 0)] = gen8_pte_encode(addr, level, flags);
+	clflush_cache_range(&vaddr[gen8_pd_index(idx, 0)], sizeof(*vaddr));
+}
+
 static int gen8_init_scratch(struct i915_address_space *vm)
 {
 	u32 pte_flags;
@@ -734,6 +752,7 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
 
 	ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
 	ppgtt->vm.insert_entries = gen8_ppgtt_insert;
+	ppgtt->vm.insert_page = gen8_ppgtt_insert_entry;
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
 
-- 
2.31.1

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[PATCH 5/9] drm/i915/gt: Add a routine to iterate over the pagetables of a GTT

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

In the next patch, we will want to look at the dma addresses of
individual page tables, so add a routine to iterate over them.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 49 ++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_gtt.h  |  7 ++++
 2 files changed, 56 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 1b676d7700bf..3d02c726c746 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -361,6 +361,54 @@ static void gen8_ppgtt_alloc(struct i915_address_space *vm,
 			   &start, start + length, vm->top);
 }
 
+static void __gen8_ppgtt_foreach(struct i915_address_space *vm,
+				 struct i915_page_directory *pd,
+				 u64 *start, u64 end, int lvl,
+				 void (*fn)(struct i915_address_space *vm,
+					    struct i915_page_table *pt,
+					    void *data),
+				 void *data)
+{
+	unsigned int idx, len;
+
+	len = gen8_pd_range(*start, end, lvl--, &idx);
+
+	spin_lock(&pd->lock);
+	do {
+		struct i915_page_table *pt = pd->entry[idx];
+
+		atomic_inc(&pt->used);
+		spin_unlock(&pd->lock);
+
+		if (lvl) {
+			__gen8_ppgtt_foreach(vm, as_pd(pt), start, end, lvl,
+					     fn, data);
+		} else {
+			fn(vm, pt, data);
+			*start += gen8_pt_count(*start, end);
+		}
+
+		spin_lock(&pd->lock);
+		atomic_dec(&pt->used);
+	} while (idx++, --len);
+	spin_unlock(&pd->lock);
+}
+
+static void gen8_ppgtt_foreach(struct i915_address_space *vm,
+			       u64 start, u64 length,
+			       void (*fn)(struct i915_address_space *vm,
+					  struct i915_page_table *pt,
+					  void *data),
+			       void *data)
+{
+	start >>= GEN8_PTE_SHIFT;
+	length >>= GEN8_PTE_SHIFT;
+
+	__gen8_ppgtt_foreach(vm, i915_vm_to_ppgtt(vm)->pd,
+			     &start, start + length, vm->top,
+			     fn, data);
+}
+
 static __always_inline u64
 gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
 		      struct i915_page_directory *pdp,
@@ -755,6 +803,7 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
 	ppgtt->vm.insert_page = gen8_ppgtt_insert_entry;
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
+	ppgtt->vm.foreach = gen8_ppgtt_foreach;
 
 	ppgtt->vm.pte_encode = gen8_pte_encode;
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index edea95b97c36..9bd89f2a01ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -296,6 +296,13 @@ struct i915_address_space {
 			       u32 flags);
 	void (*cleanup)(struct i915_address_space *vm);
 
+	void (*foreach)(struct i915_address_space *vm,
+			u64 start, u64 length,
+			void (*fn)(struct i915_address_space *vm,
+				   struct i915_page_table *pt,
+				   void *data),
+			void *data);
+
 	struct i915_vma_ops vma_ops;
 
 	I915_SELFTEST_DECLARE(struct fault_attr fault_attr);
-- 
2.31.1

[Intel-gfx] [PATCH 5/9] drm/i915/gt: Add a routine to iterate over the pagetables of a GTT

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

In the next patch, we will want to look at the dma addresses of
individual page tables, so add a routine to iterate over them.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 49 ++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_gtt.h  |  7 ++++
 2 files changed, 56 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 1b676d7700bf..3d02c726c746 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -361,6 +361,54 @@ static void gen8_ppgtt_alloc(struct i915_address_space *vm,
 			   &start, start + length, vm->top);
 }
 
+static void __gen8_ppgtt_foreach(struct i915_address_space *vm,
+				 struct i915_page_directory *pd,
+				 u64 *start, u64 end, int lvl,
+				 void (*fn)(struct i915_address_space *vm,
+					    struct i915_page_table *pt,
+					    void *data),
+				 void *data)
+{
+	unsigned int idx, len;
+
+	len = gen8_pd_range(*start, end, lvl--, &idx);
+
+	spin_lock(&pd->lock);
+	do {
+		struct i915_page_table *pt = pd->entry[idx];
+
+		atomic_inc(&pt->used);
+		spin_unlock(&pd->lock);
+
+		if (lvl) {
+			__gen8_ppgtt_foreach(vm, as_pd(pt), start, end, lvl,
+					     fn, data);
+		} else {
+			fn(vm, pt, data);
+			*start += gen8_pt_count(*start, end);
+		}
+
+		spin_lock(&pd->lock);
+		atomic_dec(&pt->used);
+	} while (idx++, --len);
+	spin_unlock(&pd->lock);
+}
+
+static void gen8_ppgtt_foreach(struct i915_address_space *vm,
+			       u64 start, u64 length,
+			       void (*fn)(struct i915_address_space *vm,
+					  struct i915_page_table *pt,
+					  void *data),
+			       void *data)
+{
+	start >>= GEN8_PTE_SHIFT;
+	length >>= GEN8_PTE_SHIFT;
+
+	__gen8_ppgtt_foreach(vm, i915_vm_to_ppgtt(vm)->pd,
+			     &start, start + length, vm->top,
+			     fn, data);
+}
+
 static __always_inline u64
 gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
 		      struct i915_page_directory *pdp,
@@ -755,6 +803,7 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
 	ppgtt->vm.insert_page = gen8_ppgtt_insert_entry;
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
+	ppgtt->vm.foreach = gen8_ppgtt_foreach;
 
 	ppgtt->vm.pte_encode = gen8_pte_encode;
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index edea95b97c36..9bd89f2a01ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -296,6 +296,13 @@ struct i915_address_space {
 			       u32 flags);
 	void (*cleanup)(struct i915_address_space *vm);
 
+	void (*foreach)(struct i915_address_space *vm,
+			u64 start, u64 length,
+			void (*fn)(struct i915_address_space *vm,
+				   struct i915_page_table *pt,
+				   void *data),
+			void *data);
+
 	struct i915_vma_ops vma_ops;
 
 	I915_SELFTEST_DECLARE(struct fault_attr fault_attr);
-- 
2.31.1

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[PATCH 6/9] drm/i915/gt: Export the pinned context constructor

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Allow internal clients to create a pinned context.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_engine.h    |  9 +++++++++
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 21 ++++++++++++++-------
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 8d9184920c51..0862c42b4cac 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -19,7 +19,9 @@
 #include "intel_workarounds.h"
 
 struct drm_printer;
+struct intel_context;
 struct intel_gt;
+struct lock_class_key;
 
 /* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
  * but keeps the logic simple. Indeed, the whole purpose of this macro is just
@@ -256,6 +258,13 @@ struct i915_request *
 intel_engine_find_active_request(struct intel_engine_cs *engine);
 
 u32 intel_engine_context_size(struct intel_gt *gt, u8 class);
+struct intel_context *
+intel_engine_create_pinned_context(struct intel_engine_cs *engine,
+				   struct i915_address_space *vm,
+				   unsigned int ring_size,
+				   unsigned int hwsp,
+				   struct lock_class_key *key,
+				   const char *name);
 
 void intel_engine_init_active(struct intel_engine_cs *engine,
 			      unsigned int subclass);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 9ceddfbb1687..ac32fd29d7ae 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -810,11 +810,13 @@ intel_engine_init_active(struct intel_engine_cs *engine, unsigned int subclass)
 #endif
 }
 
-static struct intel_context *
-create_pinned_context(struct intel_engine_cs *engine,
-		      unsigned int hwsp,
-		      struct lock_class_key *key,
-		      const char *name)
+struct intel_context *
+intel_engine_create_pinned_context(struct intel_engine_cs *engine,
+				   struct i915_address_space *vm,
+				   unsigned int ring_size,
+				   unsigned int hwsp,
+				   struct lock_class_key *key,
+				   const char *name)
 {
 	struct intel_context *ce;
 	int err;
@@ -825,6 +827,10 @@ create_pinned_context(struct intel_engine_cs *engine,
 
 	__set_bit(CONTEXT_BARRIER_BIT, &ce->flags);
 	ce->timeline = page_pack_bits(NULL, hwsp);
+	ce->ring = __intel_context_ring_size(ring_size);
+
+	i915_vm_put(ce->vm);
+	ce->vm = i915_vm_get(vm);
 
 	err = intel_context_pin(ce); /* perma-pin so it is always available */
 	if (err) {
@@ -863,8 +869,9 @@ create_kernel_context(struct intel_engine_cs *engine)
 {
 	static struct lock_class_key kernel;
 
-	return create_pinned_context(engine, I915_GEM_HWS_SEQNO_ADDR,
-				     &kernel, "kernel_context");
+	return intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_4K,
+						  I915_GEM_HWS_SEQNO_ADDR,
+						  &kernel, "kernel_context");
 }
 
 /**
-- 
2.31.1

[Intel-gfx] [PATCH 6/9] drm/i915/gt: Export the pinned context constructor

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Allow internal clients to create a pinned context.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_engine.h    |  9 +++++++++
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 21 ++++++++++++++-------
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 8d9184920c51..0862c42b4cac 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -19,7 +19,9 @@
 #include "intel_workarounds.h"
 
 struct drm_printer;
+struct intel_context;
 struct intel_gt;
+struct lock_class_key;
 
 /* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
  * but keeps the logic simple. Indeed, the whole purpose of this macro is just
@@ -256,6 +258,13 @@ struct i915_request *
 intel_engine_find_active_request(struct intel_engine_cs *engine);
 
 u32 intel_engine_context_size(struct intel_gt *gt, u8 class);
+struct intel_context *
+intel_engine_create_pinned_context(struct intel_engine_cs *engine,
+				   struct i915_address_space *vm,
+				   unsigned int ring_size,
+				   unsigned int hwsp,
+				   struct lock_class_key *key,
+				   const char *name);
 
 void intel_engine_init_active(struct intel_engine_cs *engine,
 			      unsigned int subclass);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 9ceddfbb1687..ac32fd29d7ae 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -810,11 +810,13 @@ intel_engine_init_active(struct intel_engine_cs *engine, unsigned int subclass)
 #endif
 }
 
-static struct intel_context *
-create_pinned_context(struct intel_engine_cs *engine,
-		      unsigned int hwsp,
-		      struct lock_class_key *key,
-		      const char *name)
+struct intel_context *
+intel_engine_create_pinned_context(struct intel_engine_cs *engine,
+				   struct i915_address_space *vm,
+				   unsigned int ring_size,
+				   unsigned int hwsp,
+				   struct lock_class_key *key,
+				   const char *name)
 {
 	struct intel_context *ce;
 	int err;
@@ -825,6 +827,10 @@ create_pinned_context(struct intel_engine_cs *engine,
 
 	__set_bit(CONTEXT_BARRIER_BIT, &ce->flags);
 	ce->timeline = page_pack_bits(NULL, hwsp);
+	ce->ring = __intel_context_ring_size(ring_size);
+
+	i915_vm_put(ce->vm);
+	ce->vm = i915_vm_get(vm);
 
 	err = intel_context_pin(ce); /* perma-pin so it is always available */
 	if (err) {
@@ -863,8 +869,9 @@ create_kernel_context(struct intel_engine_cs *engine)
 {
 	static struct lock_class_key kernel;
 
-	return create_pinned_context(engine, I915_GEM_HWS_SEQNO_ADDR,
-				     &kernel, "kernel_context");
+	return intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_4K,
+						  I915_GEM_HWS_SEQNO_ADDR,
+						  &kernel, "kernel_context");
 }
 
 /**
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

If we pipeline the PTE updates and then do the copy of those pages
within a single unpreemptible command packet, we can submit the copies
and leave them to be scheduled without having to synchronously wait
under a global lock. In order to manage migration, we need to
preallocate the page tables (and keep them pinned and available for use
at any time), causing a bottleneck for migrations as all clients must
contend on the limited resources. By inlining the ppGTT updates and
performing the blit atomically, each client only owns the PTE while in
use, and so we can reschedule individual operations however we see fit.
And most importantly, we do not need to take a global lock on the shared
vm, and wait until the operation is complete before releasing the lock
for others to claim the PTE for themselves.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       | 543 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
 drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
 drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
 .../drm/i915/selftests/i915_live_selftests.h  |   1 +
 9 files changed, 900 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
 create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index ea8ee4b3e018..9f18902be626 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -109,6 +109,7 @@ gt-y += \
 	gt/intel_gtt.o \
 	gt/intel_llc.o \
 	gt/intel_lrc.o \
+	gt/intel_migrate.o \
 	gt/intel_mocs.o \
 	gt/intel_ppgtt.o \
 	gt/intel_rc6.o \
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 0862c42b4cac..949965680c37 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
 #define I915_GEM_HWS_PREEMPT_ADDR	(I915_GEM_HWS_PREEMPT * sizeof(u32))
 #define I915_GEM_HWS_SEQNO		0x40
 #define I915_GEM_HWS_SEQNO_ADDR		(I915_GEM_HWS_SEQNO * sizeof(u32))
+#define I915_GEM_HWS_MIGRATE		(0x42 * sizeof(u32))
 #define I915_GEM_HWS_SCRATCH		0x80
 
 #define I915_HWS_CSB_BUF0_INDEX		0x10
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index 2694dbb9967e..1c3af0fc0456 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -123,8 +123,10 @@
 #define   MI_SEMAPHORE_SAD_NEQ_SDD	(5 << 12)
 #define   MI_SEMAPHORE_TOKEN_MASK	REG_GENMASK(9, 5)
 #define   MI_SEMAPHORE_TOKEN_SHIFT	5
+#define MI_STORE_DATA_IMM	MI_INSTR(0x20, 0)
 #define MI_STORE_DWORD_IMM	MI_INSTR(0x20, 1)
 #define MI_STORE_DWORD_IMM_GEN4	MI_INSTR(0x20, 2)
+#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
 #define   MI_MEM_VIRTUAL	(1 << 22) /* 945,g33,965 */
 #define   MI_USE_GGTT		(1 << 22) /* g4x+ */
 #define MI_STORE_DWORD_INDEX	MI_INSTR(0x21, 1)
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
new file mode 100644
index 000000000000..1f60f8ee36f8
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "i915_drv.h"
+#include "intel_context.h"
+#include "intel_gpu_commands.h"
+#include "intel_gt.h"
+#include "intel_gtt.h"
+#include "intel_migrate.h"
+#include "intel_ring.h"
+
+struct insert_pte_data {
+	u64 offset;
+	bool is_lmem;
+};
+
+#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
+
+static bool engine_supports_migration(struct intel_engine_cs *engine)
+{
+	if (!engine)
+		return false;
+
+	/*
+	 * We need the ability to prevent aribtration (MI_ARB_ON_OFF),
+	 * the ability to write PTE using inline data (MI_STORE_DATA)
+	 * and of course the ability to do the block transfer (blits).
+	 */
+	GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
+
+	return true;
+}
+
+static void insert_pte(struct i915_address_space *vm,
+		       struct i915_page_table *pt,
+		       void *data)
+{
+	struct insert_pte_data *d = data;
+
+	vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
+			d->is_lmem ? PTE_LM : 0);
+	d->offset += PAGE_SIZE;
+}
+
+static struct i915_address_space *migrate_vm(struct intel_gt *gt)
+{
+	struct i915_vm_pt_stash stash = {};
+	struct i915_ppgtt *vm;
+	int err;
+	int i;
+
+	/*
+	 * We construct a very special VM for use by all migration contexts,
+	 * it is kept pinned so that it can be used at any time. As we need
+	 * to pre-allocate the page directories for the migration VM, this
+	 * limits us to only using a small number of prepared vma.
+	 *
+	 * To be able to pipeline and reschedule migration operations while
+	 * avoiding unnecessary contention on the vm itself, the PTE updates
+	 * are inline with the blits. All the blits use the same fixed
+	 * addresses, with the backing store redirection being updated on the
+	 * fly. Only 2 implicit vma are used for all migration operations.
+	 *
+	 * We lay the ppGTT out as:
+	 *
+	 *	[0, CHUNK_SZ) -> first object
+	 *	[CHUNK_SZ, 2 * CHUNK_SZ) -> second object
+	 *	[2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] -> PTE
+	 *
+	 * By exposing the dma addresses of the page directories themselves
+	 * within the ppGTT, we are then able to rewrite the PTE prior to use.
+	 * But the PTE update and subsequent migration operation must be atomic,
+	 * i.e. within the same non-preemptible window so that we do not switch
+	 * to another migration context that overwrites the PTE.
+	 */
+
+	vm = i915_ppgtt_create(gt);
+	if (IS_ERR(vm))
+		return ERR_CAST(vm);
+
+	if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
+		err = -ENODEV;
+		goto err_vm;
+	}
+
+	/*
+	 * Each engine instance is assigned its own chunk in the VM, so
+	 * that we can run multiple instances concurrently
+	 */
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		struct intel_engine_cs *engine;
+		u64 base = (u64)i << 32;
+		struct insert_pte_data d = {};
+		struct i915_gem_ww_ctx ww;
+		u64 sz;
+
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (!engine_supports_migration(engine))
+			continue;
+
+		/*
+		 * We copy in 8MiB chunks. Each PDE covers 2MiB, so we need
+		 * 4x2 page directories for source/destination.
+		 */
+		sz = 2 * CHUNK_SZ;
+		d.offset = base + sz;
+
+		/*
+		 * We need another page directory setup so that we can write
+		 * the 8x512 PTE in each chunk.
+		 */
+		sz += (sz >> 12) * sizeof(u64);
+
+		err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
+		if (err)
+			goto err_vm;
+
+		for_i915_gem_ww(&ww, err, true) {
+			err = i915_vm_lock_objects(&vm->vm, &ww);
+			if (err)
+				continue;
+			err = i915_vm_map_pt_stash(&vm->vm, &stash);
+			if (err)
+				continue;
+
+			vm->vm.allocate_va_range(&vm->vm, &stash, base, base + sz);
+		}
+		i915_vm_free_pt_stash(&vm->vm, &stash);
+		if (err)
+			goto err_vm;
+
+		/* Now allow the GPU to rewrite the PTE via its own ppGTT */
+		d.is_lmem = i915_gem_object_is_lmem(vm->vm.scratch[0]);
+		vm->vm.foreach(&vm->vm, base, base + sz, insert_pte, &d);
+	}
+
+	return &vm->vm;
+
+err_vm:
+	i915_vm_put(&vm->vm);
+	return ERR_PTR(err);
+}
+
+static struct intel_engine_cs *first_copy_engine(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engine;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (engine_supports_migration(engine))
+			return engine;
+	}
+
+	return NULL;
+}
+
+static struct intel_context *pinned_context(struct intel_gt *gt)
+{
+	static struct lock_class_key key;
+	struct intel_engine_cs *engine;
+	struct i915_address_space *vm;
+	struct intel_context *ce;
+
+	engine = first_copy_engine(gt);
+	if (!engine)
+		return ERR_PTR(-ENODEV);
+
+	vm = migrate_vm(gt);
+	if (IS_ERR(vm))
+		return ERR_CAST(vm);
+
+	ce = intel_engine_create_pinned_context(engine, vm, SZ_512K,
+						I915_GEM_HWS_MIGRATE,
+						&key, "migrate");
+	i915_vm_put(ce->vm);
+	return ce;
+}
+
+int intel_migrate_init(struct intel_migrate *m, struct intel_gt *gt)
+{
+	struct intel_context *ce;
+
+	memset(m, 0, sizeof(*m));
+
+	ce = pinned_context(gt);
+	if (IS_ERR(ce))
+		return PTR_ERR(ce);
+
+	m->context = ce;
+	return 0;
+}
+
+static int random_index(unsigned int max)
+{
+	return upper_32_bits(mul_u32_u32(get_random_u32(), max));
+}
+
+static struct intel_context *__migrate_engines(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engines[MAX_ENGINE_INSTANCE];
+	struct intel_engine_cs *engine;
+	unsigned int count, i;
+
+	count = 0;
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (engine_supports_migration(engine))
+			engines[count++] = engine;
+	}
+
+	return intel_context_create(engines[random_index(count)]);
+}
+
+struct intel_context *intel_migrate_create_context(struct intel_migrate *m)
+{
+	struct intel_context *ce;
+
+	/*
+	 * We randomly distribute contexts across the engines upon constrction,
+	 * as they all share the same pinned vm, and so in order to allow
+	 * multiple blits to run in parallel, we must construct each blit
+	 * to use a different range of the vm for its GTT. This has to be
+	 * known at construction, so we can not use the late greedy load
+	 * balancing of the virtual-engine.
+	 */
+	ce = __migrate_engines(m->context->engine->gt);
+	if (IS_ERR(ce))
+		return ce;
+
+	ce->ring = __intel_context_ring_size(SZ_256K);
+
+	i915_vm_put(ce->vm);
+	ce->vm = i915_vm_get(m->context->vm);
+
+	return ce;
+}
+
+static inline struct sgt_dma sg_sgt(struct scatterlist *sg)
+{
+	dma_addr_t addr = sg_dma_address(sg);
+
+	return (struct sgt_dma){ sg, addr, addr + sg_dma_len(sg) };
+}
+
+static int emit_no_arbitration(struct i915_request *rq)
+{
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/* Explicitly disable preemption for this request. */
+	*cs++ = MI_ARB_ON_OFF;
+	*cs++ = MI_NOOP;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+static int emit_pte(struct i915_request *rq,
+		    struct sgt_dma *it,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u64 offset,
+		    int length)
+{
+	const u64 encode = rq->context->vm->pte_encode(0, cache_level,
+						       is_lmem ? PTE_LM : 0);
+	struct intel_ring *ring = rq->ring;
+	int total = 0;
+	u32 *hdr, *cs;
+	int pkt;
+
+	GEM_BUG_ON(INTEL_GEN(rq->engine->i915) < 8);
+
+	/* Compute the page directory offset for the target address range */
+	offset += (u64)rq->engine->instance << 32;
+	offset >>= 12;
+	offset *= sizeof(u64);
+	offset += 2 * CHUNK_SZ;
+
+	cs = intel_ring_begin(rq, 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/* Pack as many PTE updates as possible into a single MI command */
+	pkt = min_t(int, 0x400, ring->space / sizeof(u32) + 5);
+	pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+
+	hdr = cs;
+	*cs++ = MI_STORE_DATA_IMM | REG_BIT(21); /* as qword elements */
+	*cs++ = lower_32_bits(offset);
+	*cs++ = upper_32_bits(offset);
+
+	do {
+		if (cs - hdr >= pkt) {
+			*hdr += cs - hdr - 2;
+			*cs++ = MI_NOOP;
+
+			ring->emit = (void *)cs - ring->vaddr;
+			intel_ring_advance(rq, cs);
+			intel_ring_update_space(ring);
+
+			cs = intel_ring_begin(rq, 6);
+			if (IS_ERR(cs))
+				return PTR_ERR(cs);
+
+			pkt = min_t(int, 0x400, ring->space / sizeof(u32) + 5);
+			pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+
+			hdr = cs;
+			*cs++ = MI_STORE_DATA_IMM | REG_BIT(21);
+			*cs++ = lower_32_bits(offset);
+			*cs++ = upper_32_bits(offset);
+		}
+
+		*cs++ = lower_32_bits(encode | it->dma);
+		*cs++ = upper_32_bits(encode | it->dma);
+
+		offset += 8;
+		total += I915_GTT_PAGE_SIZE;
+
+		it->dma += I915_GTT_PAGE_SIZE;
+		if (it->dma >= it->max) {
+			it->sg = __sg_next(it->sg);
+			if (!it->sg || sg_dma_len(it->sg) == 0)
+				break;
+
+			it->dma = sg_dma_address(it->sg);
+			it->max = it->dma + sg_dma_len(it->sg);
+		}
+	} while (total < length);
+
+	*hdr += cs - hdr - 2;
+	*cs++ = MI_NOOP;
+
+	ring->emit = (void *)cs - ring->vaddr;
+	intel_ring_advance(rq, cs);
+	intel_ring_update_space(ring);
+
+	return total;
+}
+
+static bool wa_1209644611_applies(int gen, u32 size)
+{
+	u32 height = size >> PAGE_SHIFT;
+
+	if (gen != 11)
+		return false;
+
+	return height % 4 == 3 && height <= 8;
+}
+
+static int emit_copy(struct i915_request *rq, int size)
+{
+	const int gen = INTEL_GEN(rq->engine->i915);
+	u32 instance = rq->engine->instance;
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, gen >= 8 ? 10 : 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (gen >= 9 && !wa_1209644611_applies(gen, size)) {
+		*cs++ = GEN9_XY_FAST_COPY_BLT_CMD | (10 - 2);
+		*cs++ = BLT_DEPTH_32 | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = instance;
+		*cs++ = 0;
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+		*cs++ = instance;
+	} else if (gen >= 8) {
+		*cs++ = XY_SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (10 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = instance;
+		*cs++ = 0;
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+		*cs++ = instance;
+	} else {
+		GEM_BUG_ON(instance);
+		*cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | PAGE_SIZE;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+	}
+
+	intel_ring_advance(rq, cs);
+	return 0;
+}
+
+int
+intel_context_migrate_copy(struct intel_context *ce,
+			   struct dma_fence *await,
+			   struct scatterlist *src,
+			   enum i915_cache_level src_cache_level,
+			   bool src_is_lmem,
+			   struct scatterlist *dst,
+			   enum i915_cache_level dst_cache_level,
+			   bool dst_is_lmem,
+			   struct i915_request **out)
+{
+	struct sgt_dma it_src = sg_sgt(src), it_dst = sg_sgt(dst);
+	struct i915_request *rq;
+	int err;
+
+	*out = NULL;
+
+	/* GEM_BUG_ON(ce->vm != migrate_vm); */
+
+	GEM_BUG_ON(ce->ring->size < SZ_64K);
+
+	do {
+		int len;
+
+		rq = i915_request_create(ce);
+		if (IS_ERR(rq)) {
+			err = PTR_ERR(rq);
+			goto out_ce;
+		}
+
+		if (await) {
+			err = i915_request_await_dma_fence(rq, await);
+			if (err)
+				goto out_rq;
+
+			if (rq->engine->emit_init_breadcrumb) {
+				err = rq->engine->emit_init_breadcrumb(rq);
+				if (err)
+					goto out_rq;
+			}
+
+			await = NULL;
+		}
+
+		/* The PTE updates + copy must not be interrupted. */
+		err = emit_no_arbitration(rq);
+		if (err)
+			goto out_rq;
+
+		len = emit_pte(rq, &it_src, src_cache_level, src_is_lmem, 0,
+			       CHUNK_SZ);
+		if (len <= 0) {
+			err = len;
+			goto out_rq;
+		}
+
+		err = emit_pte(rq, &it_dst, dst_cache_level, dst_is_lmem,
+			       CHUNK_SZ, len);
+		if (err < 0)
+			goto out_rq;
+		if (err < len) {
+			err = -EINVAL;
+			goto out_rq;
+		}
+
+		err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+		if (err)
+			goto out_rq;
+
+		err = emit_copy(rq, len);
+
+		/* Arbitration is re-enabled between requests. */
+out_rq:
+		if (*out)
+			i915_request_put(*out);
+		*out = i915_request_get(rq);
+		i915_request_add(rq);
+		if (err || !it_src.sg || !sg_dma_len(it_src.sg))
+			break;
+
+		cond_resched();
+	} while (1);
+
+out_ce:
+	return err;
+}
+
+int intel_migrate_copy(struct intel_migrate *m,
+		       struct i915_gem_ww_ctx *ww,
+		       struct dma_fence *await,
+		       struct scatterlist *src,
+		       enum i915_cache_level src_cache_level,
+		       bool src_is_lmem,
+		       struct scatterlist *dst,
+		       enum i915_cache_level dst_cache_level,
+		       bool dst_is_lmem,
+		       struct i915_request **out)
+{
+	struct intel_context *ce;
+	int err;
+
+	*out = NULL;
+	if (!m->context)
+		return -ENODEV;
+
+	ce = intel_migrate_create_context(m);
+	if (IS_ERR(ce))
+		ce = intel_context_get(m->context);
+	GEM_BUG_ON(IS_ERR(ce));
+
+	err = intel_context_pin_ww(ce, ww);
+	if (err)
+		goto out;
+
+	err = intel_context_migrate_copy(ce, await,
+					 src, src_cache_level, src_is_lmem,
+					 dst, dst_cache_level, dst_is_lmem,
+					 out);
+
+	intel_context_unpin(ce);
+out:
+	intel_context_put(ce);
+	return err;
+}
+
+void intel_migrate_fini(struct intel_migrate *m)
+{
+	struct intel_context *ce;
+
+	ce = fetch_and_zero(&m->context);
+	if (!ce)
+		return;
+
+	intel_context_unpin(ce);
+	intel_context_put(ce);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftest_migrate.c"
+#endif
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.h b/drivers/gpu/drm/i915/gt/intel_migrate.h
new file mode 100644
index 000000000000..32c61190ed73
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __INTEL_MIGRATE__
+#define __INTEL_MIGRATE__
+
+#include "intel_migrate_types.h"
+
+struct dma_fence;
+struct i915_request;
+struct i915_gem_ww_ctx;
+struct intel_gt;
+struct scatterlist;
+enum i915_cache_level;
+
+int intel_migrate_init(struct intel_migrate *m, struct intel_gt *gt);
+
+struct intel_context *intel_migrate_create_context(struct intel_migrate *m);
+
+int intel_migrate_copy(struct intel_migrate *m,
+		       struct i915_gem_ww_ctx *ww,
+		       struct dma_fence *await,
+		       struct scatterlist *src,
+		       enum i915_cache_level src_cache_level,
+		       bool src_is_lmem,
+		       struct scatterlist *dst,
+		       enum i915_cache_level dst_cache_level,
+		       bool dst_is_lmem,
+		       struct i915_request **out);
+
+int intel_context_migrate_copy(struct intel_context *ce,
+			       struct dma_fence *await,
+			       struct scatterlist *src,
+			       enum i915_cache_level src_cache_level,
+			       bool src_is_lmem,
+			       struct scatterlist *dst,
+			       enum i915_cache_level dst_cache_level,
+			       bool dst_is_lmem,
+			       struct i915_request **out);
+
+void intel_migrate_fini(struct intel_migrate *m);
+
+#endif /* __INTEL_MIGRATE__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate_types.h b/drivers/gpu/drm/i915/gt/intel_migrate_types.h
new file mode 100644
index 000000000000..d98230597f42
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate_types.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __INTEL_MIGRATE_TYPES__
+#define __INTEL_MIGRATE_TYPES__
+
+struct intel_context;
+
+struct intel_migrate {
+	struct intel_context *context;
+};
+
+#endif /* __INTEL_MIGRATE_TYPES__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_ring.h b/drivers/gpu/drm/i915/gt/intel_ring.h
index dbf5f14a136f..1b32dadfb8c3 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring.h
+++ b/drivers/gpu/drm/i915/gt/intel_ring.h
@@ -49,6 +49,7 @@ static inline void intel_ring_advance(struct i915_request *rq, u32 *cs)
 	 * intel_ring_begin()).
 	 */
 	GEM_BUG_ON((rq->ring->vaddr + rq->ring->emit) != cs);
+	GEM_BUG_ON(!IS_ALIGNED(rq->ring->emit, 8)); /* RING_TAIL qword align */
 }
 
 static inline u32 intel_ring_wrap(const struct intel_ring *ring, u32 pos)
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
new file mode 100644
index 000000000000..9784d149ebf1
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "selftests/i915_random.h"
+
+static const unsigned int sizes[] = {
+	SZ_4K,
+	SZ_64K,
+	SZ_2M,
+	CHUNK_SZ - SZ_4K,
+	CHUNK_SZ,
+	CHUNK_SZ + SZ_4K,
+	SZ_64M,
+};
+
+static struct drm_i915_gem_object *
+create_lmem_or_internal(struct drm_i915_private *i915, size_t size)
+{
+	if (HAS_LMEM(i915)) {
+		struct drm_i915_gem_object *obj;
+
+		obj = i915_gem_object_create_lmem(i915, size, 0);
+		if (!IS_ERR(obj))
+			return obj;
+	}
+
+	return i915_gem_object_create_internal(i915, size);
+}
+
+static int copy(struct intel_migrate *migrate,
+		int (*fn)(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *src,
+			  struct drm_i915_gem_object *dst,
+			  struct i915_request **out),
+		u32 sz, struct rnd_state *prng)
+{
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	struct drm_i915_gem_object *src, *dst;
+	struct i915_request *rq;
+	struct i915_gem_ww_ctx ww;
+	u32 *vaddr;
+	int err = 0;
+	int i;
+
+	src = create_lmem_or_internal(i915, sz);
+	if (IS_ERR(src))
+		return 0;
+
+	dst = i915_gem_object_create_internal(i915, sz);
+	if (IS_ERR(dst))
+		goto err_free_src;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(src, &ww);
+		if (err)
+			continue;
+
+		err = i915_gem_object_lock(dst, &ww);
+		if (err)
+			continue;
+
+		vaddr = i915_gem_object_pin_map(src, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			continue;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = i;
+		i915_gem_object_flush_map(src);
+
+		vaddr = i915_gem_object_pin_map(dst, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			goto unpin_src;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = ~i;
+		i915_gem_object_flush_map(dst);
+
+		err = fn(migrate, &ww, src, dst, &rq);
+		if (!err)
+			continue;
+
+		if (err != -EDEADLK && err != -EINTR && err != -ERESTARTSYS)
+			pr_err("%ps failed, size: %u\n", fn, sz);
+		if (rq) {
+			i915_request_wait(rq, 0, HZ);
+			i915_request_put(rq);
+		}
+		i915_gem_object_unpin_map(dst);
+unpin_src:
+		i915_gem_object_unpin_map(src);
+	}
+	if (err)
+		goto err_out;
+
+	if (rq) {
+		if (i915_request_wait(rq, 0, HZ) < 0) {
+			pr_err("%ps timed out, size: %u\n", fn, sz);
+			err = -ETIME;
+		}
+		i915_request_put(rq);
+	}
+
+	for (i = 0; !err && i < sz / PAGE_SIZE; i++) {
+		int x = i * 1024 + i915_prandom_u32_max_state(1024, prng);
+
+		if (vaddr[x] != x) {
+			pr_err("%ps failed, size: %u, offset: %zu\n",
+			       fn, sz, x * sizeof(u32));
+			igt_hexdump(vaddr + i * 1024, 4096);
+			err = -EINVAL;
+		}
+	}
+
+	i915_gem_object_unpin_map(dst);
+	i915_gem_object_unpin_map(src);
+
+err_out:
+	i915_gem_object_put(dst);
+err_free_src:
+	i915_gem_object_put(src);
+
+	return err;
+}
+
+static int __migrate_copy(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *src,
+			  struct drm_i915_gem_object *dst,
+			  struct i915_request **out)
+{
+	return intel_migrate_copy(migrate, ww, NULL,
+				  src->mm.pages->sgl, src->cache_level,
+				  i915_gem_object_is_lmem(src),
+				  dst->mm.pages->sgl, dst->cache_level,
+				  i915_gem_object_is_lmem(dst),
+				  out);
+}
+
+static int __global_copy(struct intel_migrate *migrate,
+			 struct i915_gem_ww_ctx *ww,
+			 struct drm_i915_gem_object *src,
+			 struct drm_i915_gem_object *dst,
+			 struct i915_request **out)
+{
+	return intel_context_migrate_copy(migrate->context, NULL,
+					  src->mm.pages->sgl, src->cache_level,
+					  i915_gem_object_is_lmem(src),
+					  dst->mm.pages->sgl, dst->cache_level,
+					  i915_gem_object_is_lmem(dst),
+					  out);
+}
+
+static int
+migrate_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return copy(migrate, __migrate_copy, sz, prng);
+}
+
+static int
+global_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return copy(migrate, __global_copy, sz, prng);
+}
+
+static int live_migrate_copy(void *arg)
+{
+	struct intel_migrate *migrate = arg;
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		int err;
+
+		err = migrate_copy(migrate, sizes[i], &prng);
+		if (err == 0)
+			err = global_copy(migrate, sizes[i], &prng);
+		i915_gem_drain_freed_objects(i915);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+struct threaded_migrate {
+	struct intel_migrate *migrate;
+	struct task_struct *tsk;
+	struct rnd_state prng;
+};
+
+static int threaded_migrate(struct intel_migrate *migrate,
+			    int (*fn)(void *arg),
+			    unsigned int flags)
+{
+	const unsigned int n_cpus = num_online_cpus() + 1;
+	struct threaded_migrate *thread;
+	I915_RND_STATE(prng);
+	unsigned int i;
+	int err = 0;
+
+	thread = kcalloc(n_cpus, sizeof(*thread), GFP_KERNEL);
+	if (!thread)
+		return 0;
+
+	for (i = 0; i < n_cpus; ++i) {
+		struct task_struct *tsk;
+
+		thread[i].migrate = migrate;
+		thread[i].prng =
+			I915_RND_STATE_INITIALIZER(prandom_u32_state(&prng));
+
+		tsk = kthread_run(fn, &thread[i], "igt-%d", i);
+		if (IS_ERR(tsk)) {
+			err = PTR_ERR(tsk);
+			break;
+		}
+
+		get_task_struct(tsk);
+		thread[i].tsk = tsk;
+	}
+
+	msleep(10); /* start all threads before we kthread_stop() */
+
+	for (i = 0; i < n_cpus; ++i) {
+		struct task_struct *tsk = thread[i].tsk;
+		int status;
+
+		if (IS_ERR_OR_NULL(tsk))
+			continue;
+
+		status = kthread_stop(tsk);
+		if (status && !err)
+			err = status;
+
+		put_task_struct(tsk);
+	}
+
+	kfree(thread);
+	return err;
+}
+
+static int __thread_migrate_copy(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return migrate_copy(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_migrate_copy(void *arg)
+{
+	return threaded_migrate(arg, __thread_migrate_copy, 0);
+}
+
+static int __thread_global_copy(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return global_copy(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_global_copy(void *arg)
+{
+	return threaded_migrate(arg, __thread_global_copy, 0);
+}
+
+int intel_migrate_live_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(live_migrate_copy),
+		SUBTEST(thread_migrate_copy),
+		SUBTEST(thread_global_copy),
+	};
+	struct intel_migrate m;
+	int err;
+
+	if (intel_migrate_init(&m, &i915->gt))
+		return 0;
+
+	err = i915_subtests(tests, &m);
+	intel_migrate_fini(&m);
+
+	return err;
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index a92c0e9b7e6b..be5e0191eaea 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -26,6 +26,7 @@ selftest(gt_mocs, intel_mocs_live_selftests)
 selftest(gt_pm, intel_gt_pm_live_selftests)
 selftest(gt_heartbeat, intel_heartbeat_live_selftests)
 selftest(requests, i915_request_live_selftests)
+selftest(migrate, intel_migrate_live_selftests)
 selftest(active, i915_active_live_selftests)
 selftest(objects, i915_gem_object_live_selftests)
 selftest(mman, i915_gem_mman_live_selftests)
-- 
2.31.1

[Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

If we pipeline the PTE updates and then do the copy of those pages
within a single unpreemptible command packet, we can submit the copies
and leave them to be scheduled without having to synchronously wait
under a global lock. In order to manage migration, we need to
preallocate the page tables (and keep them pinned and available for use
at any time), causing a bottleneck for migrations as all clients must
contend on the limited resources. By inlining the ppGTT updates and
performing the blit atomically, each client only owns the PTE while in
use, and so we can reschedule individual operations however we see fit.
And most importantly, we do not need to take a global lock on the shared
vm, and wait until the operation is complete before releasing the lock
for others to claim the PTE for themselves.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       | 543 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
 drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
 drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
 .../drm/i915/selftests/i915_live_selftests.h  |   1 +
 9 files changed, 900 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
 create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
 create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index ea8ee4b3e018..9f18902be626 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -109,6 +109,7 @@ gt-y += \
 	gt/intel_gtt.o \
 	gt/intel_llc.o \
 	gt/intel_lrc.o \
+	gt/intel_migrate.o \
 	gt/intel_mocs.o \
 	gt/intel_ppgtt.o \
 	gt/intel_rc6.o \
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 0862c42b4cac..949965680c37 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
 #define I915_GEM_HWS_PREEMPT_ADDR	(I915_GEM_HWS_PREEMPT * sizeof(u32))
 #define I915_GEM_HWS_SEQNO		0x40
 #define I915_GEM_HWS_SEQNO_ADDR		(I915_GEM_HWS_SEQNO * sizeof(u32))
+#define I915_GEM_HWS_MIGRATE		(0x42 * sizeof(u32))
 #define I915_GEM_HWS_SCRATCH		0x80
 
 #define I915_HWS_CSB_BUF0_INDEX		0x10
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index 2694dbb9967e..1c3af0fc0456 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -123,8 +123,10 @@
 #define   MI_SEMAPHORE_SAD_NEQ_SDD	(5 << 12)
 #define   MI_SEMAPHORE_TOKEN_MASK	REG_GENMASK(9, 5)
 #define   MI_SEMAPHORE_TOKEN_SHIFT	5
+#define MI_STORE_DATA_IMM	MI_INSTR(0x20, 0)
 #define MI_STORE_DWORD_IMM	MI_INSTR(0x20, 1)
 #define MI_STORE_DWORD_IMM_GEN4	MI_INSTR(0x20, 2)
+#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
 #define   MI_MEM_VIRTUAL	(1 << 22) /* 945,g33,965 */
 #define   MI_USE_GGTT		(1 << 22) /* g4x+ */
 #define MI_STORE_DWORD_INDEX	MI_INSTR(0x21, 1)
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
new file mode 100644
index 000000000000..1f60f8ee36f8
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "i915_drv.h"
+#include "intel_context.h"
+#include "intel_gpu_commands.h"
+#include "intel_gt.h"
+#include "intel_gtt.h"
+#include "intel_migrate.h"
+#include "intel_ring.h"
+
+struct insert_pte_data {
+	u64 offset;
+	bool is_lmem;
+};
+
+#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
+
+static bool engine_supports_migration(struct intel_engine_cs *engine)
+{
+	if (!engine)
+		return false;
+
+	/*
+	 * We need the ability to prevent aribtration (MI_ARB_ON_OFF),
+	 * the ability to write PTE using inline data (MI_STORE_DATA)
+	 * and of course the ability to do the block transfer (blits).
+	 */
+	GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
+
+	return true;
+}
+
+static void insert_pte(struct i915_address_space *vm,
+		       struct i915_page_table *pt,
+		       void *data)
+{
+	struct insert_pte_data *d = data;
+
+	vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
+			d->is_lmem ? PTE_LM : 0);
+	d->offset += PAGE_SIZE;
+}
+
+static struct i915_address_space *migrate_vm(struct intel_gt *gt)
+{
+	struct i915_vm_pt_stash stash = {};
+	struct i915_ppgtt *vm;
+	int err;
+	int i;
+
+	/*
+	 * We construct a very special VM for use by all migration contexts,
+	 * it is kept pinned so that it can be used at any time. As we need
+	 * to pre-allocate the page directories for the migration VM, this
+	 * limits us to only using a small number of prepared vma.
+	 *
+	 * To be able to pipeline and reschedule migration operations while
+	 * avoiding unnecessary contention on the vm itself, the PTE updates
+	 * are inline with the blits. All the blits use the same fixed
+	 * addresses, with the backing store redirection being updated on the
+	 * fly. Only 2 implicit vma are used for all migration operations.
+	 *
+	 * We lay the ppGTT out as:
+	 *
+	 *	[0, CHUNK_SZ) -> first object
+	 *	[CHUNK_SZ, 2 * CHUNK_SZ) -> second object
+	 *	[2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] -> PTE
+	 *
+	 * By exposing the dma addresses of the page directories themselves
+	 * within the ppGTT, we are then able to rewrite the PTE prior to use.
+	 * But the PTE update and subsequent migration operation must be atomic,
+	 * i.e. within the same non-preemptible window so that we do not switch
+	 * to another migration context that overwrites the PTE.
+	 */
+
+	vm = i915_ppgtt_create(gt);
+	if (IS_ERR(vm))
+		return ERR_CAST(vm);
+
+	if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
+		err = -ENODEV;
+		goto err_vm;
+	}
+
+	/*
+	 * Each engine instance is assigned its own chunk in the VM, so
+	 * that we can run multiple instances concurrently
+	 */
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		struct intel_engine_cs *engine;
+		u64 base = (u64)i << 32;
+		struct insert_pte_data d = {};
+		struct i915_gem_ww_ctx ww;
+		u64 sz;
+
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (!engine_supports_migration(engine))
+			continue;
+
+		/*
+		 * We copy in 8MiB chunks. Each PDE covers 2MiB, so we need
+		 * 4x2 page directories for source/destination.
+		 */
+		sz = 2 * CHUNK_SZ;
+		d.offset = base + sz;
+
+		/*
+		 * We need another page directory setup so that we can write
+		 * the 8x512 PTE in each chunk.
+		 */
+		sz += (sz >> 12) * sizeof(u64);
+
+		err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
+		if (err)
+			goto err_vm;
+
+		for_i915_gem_ww(&ww, err, true) {
+			err = i915_vm_lock_objects(&vm->vm, &ww);
+			if (err)
+				continue;
+			err = i915_vm_map_pt_stash(&vm->vm, &stash);
+			if (err)
+				continue;
+
+			vm->vm.allocate_va_range(&vm->vm, &stash, base, base + sz);
+		}
+		i915_vm_free_pt_stash(&vm->vm, &stash);
+		if (err)
+			goto err_vm;
+
+		/* Now allow the GPU to rewrite the PTE via its own ppGTT */
+		d.is_lmem = i915_gem_object_is_lmem(vm->vm.scratch[0]);
+		vm->vm.foreach(&vm->vm, base, base + sz, insert_pte, &d);
+	}
+
+	return &vm->vm;
+
+err_vm:
+	i915_vm_put(&vm->vm);
+	return ERR_PTR(err);
+}
+
+static struct intel_engine_cs *first_copy_engine(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engine;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (engine_supports_migration(engine))
+			return engine;
+	}
+
+	return NULL;
+}
+
+static struct intel_context *pinned_context(struct intel_gt *gt)
+{
+	static struct lock_class_key key;
+	struct intel_engine_cs *engine;
+	struct i915_address_space *vm;
+	struct intel_context *ce;
+
+	engine = first_copy_engine(gt);
+	if (!engine)
+		return ERR_PTR(-ENODEV);
+
+	vm = migrate_vm(gt);
+	if (IS_ERR(vm))
+		return ERR_CAST(vm);
+
+	ce = intel_engine_create_pinned_context(engine, vm, SZ_512K,
+						I915_GEM_HWS_MIGRATE,
+						&key, "migrate");
+	i915_vm_put(ce->vm);
+	return ce;
+}
+
+int intel_migrate_init(struct intel_migrate *m, struct intel_gt *gt)
+{
+	struct intel_context *ce;
+
+	memset(m, 0, sizeof(*m));
+
+	ce = pinned_context(gt);
+	if (IS_ERR(ce))
+		return PTR_ERR(ce);
+
+	m->context = ce;
+	return 0;
+}
+
+static int random_index(unsigned int max)
+{
+	return upper_32_bits(mul_u32_u32(get_random_u32(), max));
+}
+
+static struct intel_context *__migrate_engines(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engines[MAX_ENGINE_INSTANCE];
+	struct intel_engine_cs *engine;
+	unsigned int count, i;
+
+	count = 0;
+	for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
+		engine = gt->engine_class[COPY_ENGINE_CLASS][i];
+		if (engine_supports_migration(engine))
+			engines[count++] = engine;
+	}
+
+	return intel_context_create(engines[random_index(count)]);
+}
+
+struct intel_context *intel_migrate_create_context(struct intel_migrate *m)
+{
+	struct intel_context *ce;
+
+	/*
+	 * We randomly distribute contexts across the engines upon constrction,
+	 * as they all share the same pinned vm, and so in order to allow
+	 * multiple blits to run in parallel, we must construct each blit
+	 * to use a different range of the vm for its GTT. This has to be
+	 * known at construction, so we can not use the late greedy load
+	 * balancing of the virtual-engine.
+	 */
+	ce = __migrate_engines(m->context->engine->gt);
+	if (IS_ERR(ce))
+		return ce;
+
+	ce->ring = __intel_context_ring_size(SZ_256K);
+
+	i915_vm_put(ce->vm);
+	ce->vm = i915_vm_get(m->context->vm);
+
+	return ce;
+}
+
+static inline struct sgt_dma sg_sgt(struct scatterlist *sg)
+{
+	dma_addr_t addr = sg_dma_address(sg);
+
+	return (struct sgt_dma){ sg, addr, addr + sg_dma_len(sg) };
+}
+
+static int emit_no_arbitration(struct i915_request *rq)
+{
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, 2);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/* Explicitly disable preemption for this request. */
+	*cs++ = MI_ARB_ON_OFF;
+	*cs++ = MI_NOOP;
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+static int emit_pte(struct i915_request *rq,
+		    struct sgt_dma *it,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u64 offset,
+		    int length)
+{
+	const u64 encode = rq->context->vm->pte_encode(0, cache_level,
+						       is_lmem ? PTE_LM : 0);
+	struct intel_ring *ring = rq->ring;
+	int total = 0;
+	u32 *hdr, *cs;
+	int pkt;
+
+	GEM_BUG_ON(INTEL_GEN(rq->engine->i915) < 8);
+
+	/* Compute the page directory offset for the target address range */
+	offset += (u64)rq->engine->instance << 32;
+	offset >>= 12;
+	offset *= sizeof(u64);
+	offset += 2 * CHUNK_SZ;
+
+	cs = intel_ring_begin(rq, 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/* Pack as many PTE updates as possible into a single MI command */
+	pkt = min_t(int, 0x400, ring->space / sizeof(u32) + 5);
+	pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+
+	hdr = cs;
+	*cs++ = MI_STORE_DATA_IMM | REG_BIT(21); /* as qword elements */
+	*cs++ = lower_32_bits(offset);
+	*cs++ = upper_32_bits(offset);
+
+	do {
+		if (cs - hdr >= pkt) {
+			*hdr += cs - hdr - 2;
+			*cs++ = MI_NOOP;
+
+			ring->emit = (void *)cs - ring->vaddr;
+			intel_ring_advance(rq, cs);
+			intel_ring_update_space(ring);
+
+			cs = intel_ring_begin(rq, 6);
+			if (IS_ERR(cs))
+				return PTR_ERR(cs);
+
+			pkt = min_t(int, 0x400, ring->space / sizeof(u32) + 5);
+			pkt = min_t(int, pkt, (ring->size - ring->emit) / sizeof(u32) + 5);
+
+			hdr = cs;
+			*cs++ = MI_STORE_DATA_IMM | REG_BIT(21);
+			*cs++ = lower_32_bits(offset);
+			*cs++ = upper_32_bits(offset);
+		}
+
+		*cs++ = lower_32_bits(encode | it->dma);
+		*cs++ = upper_32_bits(encode | it->dma);
+
+		offset += 8;
+		total += I915_GTT_PAGE_SIZE;
+
+		it->dma += I915_GTT_PAGE_SIZE;
+		if (it->dma >= it->max) {
+			it->sg = __sg_next(it->sg);
+			if (!it->sg || sg_dma_len(it->sg) == 0)
+				break;
+
+			it->dma = sg_dma_address(it->sg);
+			it->max = it->dma + sg_dma_len(it->sg);
+		}
+	} while (total < length);
+
+	*hdr += cs - hdr - 2;
+	*cs++ = MI_NOOP;
+
+	ring->emit = (void *)cs - ring->vaddr;
+	intel_ring_advance(rq, cs);
+	intel_ring_update_space(ring);
+
+	return total;
+}
+
+static bool wa_1209644611_applies(int gen, u32 size)
+{
+	u32 height = size >> PAGE_SHIFT;
+
+	if (gen != 11)
+		return false;
+
+	return height % 4 == 3 && height <= 8;
+}
+
+static int emit_copy(struct i915_request *rq, int size)
+{
+	const int gen = INTEL_GEN(rq->engine->i915);
+	u32 instance = rq->engine->instance;
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, gen >= 8 ? 10 : 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (gen >= 9 && !wa_1209644611_applies(gen, size)) {
+		*cs++ = GEN9_XY_FAST_COPY_BLT_CMD | (10 - 2);
+		*cs++ = BLT_DEPTH_32 | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = instance;
+		*cs++ = 0;
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+		*cs++ = instance;
+	} else if (gen >= 8) {
+		*cs++ = XY_SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (10 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = instance;
+		*cs++ = 0;
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+		*cs++ = instance;
+	} else {
+		GEM_BUG_ON(instance);
+		*cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | PAGE_SIZE;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE;
+		*cs++ = CHUNK_SZ; /* dst offset */
+		*cs++ = PAGE_SIZE;
+		*cs++ = 0; /* src offset */
+	}
+
+	intel_ring_advance(rq, cs);
+	return 0;
+}
+
+int
+intel_context_migrate_copy(struct intel_context *ce,
+			   struct dma_fence *await,
+			   struct scatterlist *src,
+			   enum i915_cache_level src_cache_level,
+			   bool src_is_lmem,
+			   struct scatterlist *dst,
+			   enum i915_cache_level dst_cache_level,
+			   bool dst_is_lmem,
+			   struct i915_request **out)
+{
+	struct sgt_dma it_src = sg_sgt(src), it_dst = sg_sgt(dst);
+	struct i915_request *rq;
+	int err;
+
+	*out = NULL;
+
+	/* GEM_BUG_ON(ce->vm != migrate_vm); */
+
+	GEM_BUG_ON(ce->ring->size < SZ_64K);
+
+	do {
+		int len;
+
+		rq = i915_request_create(ce);
+		if (IS_ERR(rq)) {
+			err = PTR_ERR(rq);
+			goto out_ce;
+		}
+
+		if (await) {
+			err = i915_request_await_dma_fence(rq, await);
+			if (err)
+				goto out_rq;
+
+			if (rq->engine->emit_init_breadcrumb) {
+				err = rq->engine->emit_init_breadcrumb(rq);
+				if (err)
+					goto out_rq;
+			}
+
+			await = NULL;
+		}
+
+		/* The PTE updates + copy must not be interrupted. */
+		err = emit_no_arbitration(rq);
+		if (err)
+			goto out_rq;
+
+		len = emit_pte(rq, &it_src, src_cache_level, src_is_lmem, 0,
+			       CHUNK_SZ);
+		if (len <= 0) {
+			err = len;
+			goto out_rq;
+		}
+
+		err = emit_pte(rq, &it_dst, dst_cache_level, dst_is_lmem,
+			       CHUNK_SZ, len);
+		if (err < 0)
+			goto out_rq;
+		if (err < len) {
+			err = -EINVAL;
+			goto out_rq;
+		}
+
+		err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+		if (err)
+			goto out_rq;
+
+		err = emit_copy(rq, len);
+
+		/* Arbitration is re-enabled between requests. */
+out_rq:
+		if (*out)
+			i915_request_put(*out);
+		*out = i915_request_get(rq);
+		i915_request_add(rq);
+		if (err || !it_src.sg || !sg_dma_len(it_src.sg))
+			break;
+
+		cond_resched();
+	} while (1);
+
+out_ce:
+	return err;
+}
+
+int intel_migrate_copy(struct intel_migrate *m,
+		       struct i915_gem_ww_ctx *ww,
+		       struct dma_fence *await,
+		       struct scatterlist *src,
+		       enum i915_cache_level src_cache_level,
+		       bool src_is_lmem,
+		       struct scatterlist *dst,
+		       enum i915_cache_level dst_cache_level,
+		       bool dst_is_lmem,
+		       struct i915_request **out)
+{
+	struct intel_context *ce;
+	int err;
+
+	*out = NULL;
+	if (!m->context)
+		return -ENODEV;
+
+	ce = intel_migrate_create_context(m);
+	if (IS_ERR(ce))
+		ce = intel_context_get(m->context);
+	GEM_BUG_ON(IS_ERR(ce));
+
+	err = intel_context_pin_ww(ce, ww);
+	if (err)
+		goto out;
+
+	err = intel_context_migrate_copy(ce, await,
+					 src, src_cache_level, src_is_lmem,
+					 dst, dst_cache_level, dst_is_lmem,
+					 out);
+
+	intel_context_unpin(ce);
+out:
+	intel_context_put(ce);
+	return err;
+}
+
+void intel_migrate_fini(struct intel_migrate *m)
+{
+	struct intel_context *ce;
+
+	ce = fetch_and_zero(&m->context);
+	if (!ce)
+		return;
+
+	intel_context_unpin(ce);
+	intel_context_put(ce);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftest_migrate.c"
+#endif
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.h b/drivers/gpu/drm/i915/gt/intel_migrate.h
new file mode 100644
index 000000000000..32c61190ed73
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __INTEL_MIGRATE__
+#define __INTEL_MIGRATE__
+
+#include "intel_migrate_types.h"
+
+struct dma_fence;
+struct i915_request;
+struct i915_gem_ww_ctx;
+struct intel_gt;
+struct scatterlist;
+enum i915_cache_level;
+
+int intel_migrate_init(struct intel_migrate *m, struct intel_gt *gt);
+
+struct intel_context *intel_migrate_create_context(struct intel_migrate *m);
+
+int intel_migrate_copy(struct intel_migrate *m,
+		       struct i915_gem_ww_ctx *ww,
+		       struct dma_fence *await,
+		       struct scatterlist *src,
+		       enum i915_cache_level src_cache_level,
+		       bool src_is_lmem,
+		       struct scatterlist *dst,
+		       enum i915_cache_level dst_cache_level,
+		       bool dst_is_lmem,
+		       struct i915_request **out);
+
+int intel_context_migrate_copy(struct intel_context *ce,
+			       struct dma_fence *await,
+			       struct scatterlist *src,
+			       enum i915_cache_level src_cache_level,
+			       bool src_is_lmem,
+			       struct scatterlist *dst,
+			       enum i915_cache_level dst_cache_level,
+			       bool dst_is_lmem,
+			       struct i915_request **out);
+
+void intel_migrate_fini(struct intel_migrate *m);
+
+#endif /* __INTEL_MIGRATE__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate_types.h b/drivers/gpu/drm/i915/gt/intel_migrate_types.h
new file mode 100644
index 000000000000..d98230597f42
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_migrate_types.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __INTEL_MIGRATE_TYPES__
+#define __INTEL_MIGRATE_TYPES__
+
+struct intel_context;
+
+struct intel_migrate {
+	struct intel_context *context;
+};
+
+#endif /* __INTEL_MIGRATE_TYPES__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_ring.h b/drivers/gpu/drm/i915/gt/intel_ring.h
index dbf5f14a136f..1b32dadfb8c3 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring.h
+++ b/drivers/gpu/drm/i915/gt/intel_ring.h
@@ -49,6 +49,7 @@ static inline void intel_ring_advance(struct i915_request *rq, u32 *cs)
 	 * intel_ring_begin()).
 	 */
 	GEM_BUG_ON((rq->ring->vaddr + rq->ring->emit) != cs);
+	GEM_BUG_ON(!IS_ALIGNED(rq->ring->emit, 8)); /* RING_TAIL qword align */
 }
 
 static inline u32 intel_ring_wrap(const struct intel_ring *ring, u32 pos)
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
new file mode 100644
index 000000000000..9784d149ebf1
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "selftests/i915_random.h"
+
+static const unsigned int sizes[] = {
+	SZ_4K,
+	SZ_64K,
+	SZ_2M,
+	CHUNK_SZ - SZ_4K,
+	CHUNK_SZ,
+	CHUNK_SZ + SZ_4K,
+	SZ_64M,
+};
+
+static struct drm_i915_gem_object *
+create_lmem_or_internal(struct drm_i915_private *i915, size_t size)
+{
+	if (HAS_LMEM(i915)) {
+		struct drm_i915_gem_object *obj;
+
+		obj = i915_gem_object_create_lmem(i915, size, 0);
+		if (!IS_ERR(obj))
+			return obj;
+	}
+
+	return i915_gem_object_create_internal(i915, size);
+}
+
+static int copy(struct intel_migrate *migrate,
+		int (*fn)(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *src,
+			  struct drm_i915_gem_object *dst,
+			  struct i915_request **out),
+		u32 sz, struct rnd_state *prng)
+{
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	struct drm_i915_gem_object *src, *dst;
+	struct i915_request *rq;
+	struct i915_gem_ww_ctx ww;
+	u32 *vaddr;
+	int err = 0;
+	int i;
+
+	src = create_lmem_or_internal(i915, sz);
+	if (IS_ERR(src))
+		return 0;
+
+	dst = i915_gem_object_create_internal(i915, sz);
+	if (IS_ERR(dst))
+		goto err_free_src;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(src, &ww);
+		if (err)
+			continue;
+
+		err = i915_gem_object_lock(dst, &ww);
+		if (err)
+			continue;
+
+		vaddr = i915_gem_object_pin_map(src, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			continue;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = i;
+		i915_gem_object_flush_map(src);
+
+		vaddr = i915_gem_object_pin_map(dst, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			goto unpin_src;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = ~i;
+		i915_gem_object_flush_map(dst);
+
+		err = fn(migrate, &ww, src, dst, &rq);
+		if (!err)
+			continue;
+
+		if (err != -EDEADLK && err != -EINTR && err != -ERESTARTSYS)
+			pr_err("%ps failed, size: %u\n", fn, sz);
+		if (rq) {
+			i915_request_wait(rq, 0, HZ);
+			i915_request_put(rq);
+		}
+		i915_gem_object_unpin_map(dst);
+unpin_src:
+		i915_gem_object_unpin_map(src);
+	}
+	if (err)
+		goto err_out;
+
+	if (rq) {
+		if (i915_request_wait(rq, 0, HZ) < 0) {
+			pr_err("%ps timed out, size: %u\n", fn, sz);
+			err = -ETIME;
+		}
+		i915_request_put(rq);
+	}
+
+	for (i = 0; !err && i < sz / PAGE_SIZE; i++) {
+		int x = i * 1024 + i915_prandom_u32_max_state(1024, prng);
+
+		if (vaddr[x] != x) {
+			pr_err("%ps failed, size: %u, offset: %zu\n",
+			       fn, sz, x * sizeof(u32));
+			igt_hexdump(vaddr + i * 1024, 4096);
+			err = -EINVAL;
+		}
+	}
+
+	i915_gem_object_unpin_map(dst);
+	i915_gem_object_unpin_map(src);
+
+err_out:
+	i915_gem_object_put(dst);
+err_free_src:
+	i915_gem_object_put(src);
+
+	return err;
+}
+
+static int __migrate_copy(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *src,
+			  struct drm_i915_gem_object *dst,
+			  struct i915_request **out)
+{
+	return intel_migrate_copy(migrate, ww, NULL,
+				  src->mm.pages->sgl, src->cache_level,
+				  i915_gem_object_is_lmem(src),
+				  dst->mm.pages->sgl, dst->cache_level,
+				  i915_gem_object_is_lmem(dst),
+				  out);
+}
+
+static int __global_copy(struct intel_migrate *migrate,
+			 struct i915_gem_ww_ctx *ww,
+			 struct drm_i915_gem_object *src,
+			 struct drm_i915_gem_object *dst,
+			 struct i915_request **out)
+{
+	return intel_context_migrate_copy(migrate->context, NULL,
+					  src->mm.pages->sgl, src->cache_level,
+					  i915_gem_object_is_lmem(src),
+					  dst->mm.pages->sgl, dst->cache_level,
+					  i915_gem_object_is_lmem(dst),
+					  out);
+}
+
+static int
+migrate_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return copy(migrate, __migrate_copy, sz, prng);
+}
+
+static int
+global_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return copy(migrate, __global_copy, sz, prng);
+}
+
+static int live_migrate_copy(void *arg)
+{
+	struct intel_migrate *migrate = arg;
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		int err;
+
+		err = migrate_copy(migrate, sizes[i], &prng);
+		if (err == 0)
+			err = global_copy(migrate, sizes[i], &prng);
+		i915_gem_drain_freed_objects(i915);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+struct threaded_migrate {
+	struct intel_migrate *migrate;
+	struct task_struct *tsk;
+	struct rnd_state prng;
+};
+
+static int threaded_migrate(struct intel_migrate *migrate,
+			    int (*fn)(void *arg),
+			    unsigned int flags)
+{
+	const unsigned int n_cpus = num_online_cpus() + 1;
+	struct threaded_migrate *thread;
+	I915_RND_STATE(prng);
+	unsigned int i;
+	int err = 0;
+
+	thread = kcalloc(n_cpus, sizeof(*thread), GFP_KERNEL);
+	if (!thread)
+		return 0;
+
+	for (i = 0; i < n_cpus; ++i) {
+		struct task_struct *tsk;
+
+		thread[i].migrate = migrate;
+		thread[i].prng =
+			I915_RND_STATE_INITIALIZER(prandom_u32_state(&prng));
+
+		tsk = kthread_run(fn, &thread[i], "igt-%d", i);
+		if (IS_ERR(tsk)) {
+			err = PTR_ERR(tsk);
+			break;
+		}
+
+		get_task_struct(tsk);
+		thread[i].tsk = tsk;
+	}
+
+	msleep(10); /* start all threads before we kthread_stop() */
+
+	for (i = 0; i < n_cpus; ++i) {
+		struct task_struct *tsk = thread[i].tsk;
+		int status;
+
+		if (IS_ERR_OR_NULL(tsk))
+			continue;
+
+		status = kthread_stop(tsk);
+		if (status && !err)
+			err = status;
+
+		put_task_struct(tsk);
+	}
+
+	kfree(thread);
+	return err;
+}
+
+static int __thread_migrate_copy(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return migrate_copy(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_migrate_copy(void *arg)
+{
+	return threaded_migrate(arg, __thread_migrate_copy, 0);
+}
+
+static int __thread_global_copy(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return global_copy(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_global_copy(void *arg)
+{
+	return threaded_migrate(arg, __thread_global_copy, 0);
+}
+
+int intel_migrate_live_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(live_migrate_copy),
+		SUBTEST(thread_migrate_copy),
+		SUBTEST(thread_global_copy),
+	};
+	struct intel_migrate m;
+	int err;
+
+	if (intel_migrate_init(&m, &i915->gt))
+		return 0;
+
+	err = i915_subtests(tests, &m);
+	intel_migrate_fini(&m);
+
+	return err;
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index a92c0e9b7e6b..be5e0191eaea 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -26,6 +26,7 @@ selftest(gt_mocs, intel_mocs_live_selftests)
 selftest(gt_pm, intel_gt_pm_live_selftests)
 selftest(gt_heartbeat, intel_heartbeat_live_selftests)
 selftest(requests, i915_request_live_selftests)
+selftest(migrate, intel_migrate_live_selftests)
 selftest(active, i915_active_live_selftests)
 selftest(objects, i915_gem_object_live_selftests)
 selftest(mman, i915_gem_mman_live_selftests)
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> From: Chris Wilson <chris@chris-wilson.co.uk>
>
> If we pipeline the PTE updates and then do the copy of those pages
> within a single unpreemptible command packet, we can submit the copies
> and leave them to be scheduled without having to synchronously wait
> under a global lock. In order to manage migration, we need to
> preallocate the page tables (and keep them pinned and available for use
> at any time), causing a bottleneck for migrations as all clients must
> contend on the limited resources. By inlining the ppGTT updates and
> performing the blit atomically, each client only owns the PTE while in
> use, and so we can reschedule individual operations however we see fit.
> And most importantly, we do not need to take a global lock on the shared
> vm, and wait until the operation is complete before releasing the lock
> for others to claim the PTE for themselves.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
>  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543 ++++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
>  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
>  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
>  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
>  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
>  9 files changed, 900 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
>  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index ea8ee4b3e018..9f18902be626 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -109,6 +109,7 @@ gt-y += \
>         gt/intel_gtt.o \
>         gt/intel_llc.o \
>         gt/intel_lrc.o \
> +       gt/intel_migrate.o \
>         gt/intel_mocs.o \
>         gt/intel_ppgtt.o \
>         gt/intel_rc6.o \
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> index 0862c42b4cac..949965680c37 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
>  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT * sizeof(u32))
>  #define I915_GEM_HWS_SEQNO             0x40
>  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO * sizeof(u32))
> +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
>  #define I915_GEM_HWS_SCRATCH           0x80
>
>  #define I915_HWS_CSB_BUF0_INDEX                0x10
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 2694dbb9967e..1c3af0fc0456 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -123,8 +123,10 @@
>  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
>  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
>  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
>  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
>  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
>  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
>  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
>  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
> new file mode 100644
> index 000000000000..1f60f8ee36f8
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> @@ -0,0 +1,543 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#include "i915_drv.h"
> +#include "intel_context.h"
> +#include "intel_gpu_commands.h"
> +#include "intel_gt.h"
> +#include "intel_gtt.h"
> +#include "intel_migrate.h"
> +#include "intel_ring.h"
> +
> +struct insert_pte_data {
> +       u64 offset;
> +       bool is_lmem;
> +};
> +
> +#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
> +
> +static bool engine_supports_migration(struct intel_engine_cs *engine)
> +{
> +       if (!engine)
> +               return false;
> +
> +       /*
> +        * We need the ability to prevent aribtration (MI_ARB_ON_OFF),
> +        * the ability to write PTE using inline data (MI_STORE_DATA)
> +        * and of course the ability to do the block transfer (blits).
> +        */
> +       GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
> +
> +       return true;
> +}
> +
> +static void insert_pte(struct i915_address_space *vm,
> +                      struct i915_page_table *pt,
> +                      void *data)
> +{
> +       struct insert_pte_data *d = data;
> +
> +       vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
> +                       d->is_lmem ? PTE_LM : 0);
> +       d->offset += PAGE_SIZE;
> +}
> +
> +static struct i915_address_space *migrate_vm(struct intel_gt *gt)
> +{
> +       struct i915_vm_pt_stash stash = {};
> +       struct i915_ppgtt *vm;
> +       int err;
> +       int i;
> +
> +       /*
> +        * We construct a very special VM for use by all migration contexts,
> +        * it is kept pinned so that it can be used at any time. As we need
> +        * to pre-allocate the page directories for the migration VM, this
> +        * limits us to only using a small number of prepared vma.
> +        *
> +        * To be able to pipeline and reschedule migration operations while
> +        * avoiding unnecessary contention on the vm itself, the PTE updates
> +        * are inline with the blits. All the blits use the same fixed
> +        * addresses, with the backing store redirection being updated on the
> +        * fly. Only 2 implicit vma are used for all migration operations.
> +        *
> +        * We lay the ppGTT out as:
> +        *
> +        *      [0, CHUNK_SZ) -> first object
> +        *      [CHUNK_SZ, 2 * CHUNK_SZ) -> second object
> +        *      [2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] -> PTE
> +        *
> +        * By exposing the dma addresses of the page directories themselves
> +        * within the ppGTT, we are then able to rewrite the PTE prior to use.
> +        * But the PTE update and subsequent migration operation must be atomic,
> +        * i.e. within the same non-preemptible window so that we do not switch
> +        * to another migration context that overwrites the PTE.
> +        */
> +
> +       vm = i915_ppgtt_create(gt);
> +       if (IS_ERR(vm))
> +               return ERR_CAST(vm);
> +
> +       if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
> +               err = -ENODEV;
> +               goto err_vm;
> +       }
> +
> +       /*
> +        * Each engine instance is assigned its own chunk in the VM, so
> +        * that we can run multiple instances concurrently
> +        */
> +       for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
> +               struct intel_engine_cs *engine;
> +               u64 base = (u64)i << 32;
> +               struct insert_pte_data d = {};
> +               struct i915_gem_ww_ctx ww;
> +               u64 sz;
> +
> +               engine = gt->engine_class[COPY_ENGINE_CLASS][i];
> +               if (!engine_supports_migration(engine))
> +                       continue;
> +
> +               /*
> +                * We copy in 8MiB chunks. Each PDE covers 2MiB, so we need
> +                * 4x2 page directories for source/destination.
> +                */
> +               sz = 2 * CHUNK_SZ;
> +               d.offset = base + sz;
> +
> +               /*
> +                * We need another page directory setup so that we can write
> +                * the 8x512 PTE in each chunk.
> +                */
> +               sz += (sz >> 12) * sizeof(u64);
> +
> +               err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
> +               if (err)
> +                       goto err_vm;
> +
> +               for_i915_gem_ww(&ww, err, true) {
> +                       err = i915_vm_lock_objects(&vm->vm, &ww);
> +                       if (err)
> +                               continue;
> +                       err = i915_vm_map_pt_stash(&vm->vm, &stash);
> +                       if (err)
> +                               continue;
> +
> +                       vm->vm.allocate_va_range(&vm->vm, &stash, base, base + sz);
> +               }
> +               i915_vm_free_pt_stash(&vm->vm, &stash);
> +               if (err)
> +                       goto err_vm;
> +
> +               /* Now allow the GPU to rewrite the PTE via its own ppGTT */
> +               d.is_lmem = i915_gem_object_is_lmem(vm->vm.scratch[0]);
> +               vm->vm.foreach(&vm->vm, base, base + sz, insert_pte, &d);

Will this play nice with Xe HP where we have min page size
restrictions for the GTT + lmem? The page-table allocations sidestep
such restrictions since they were previously never inserted into the
GTT. Maybe we need the flat-ppGTT at some point? Perhaps add a TODO or
something?

Re: [Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Matthew Auld]

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
<thomas.hellstrom@linux.intel.com> wrote:
>
> From: Chris Wilson <chris@chris-wilson.co.uk>
>
> If we pipeline the PTE updates and then do the copy of those pages
> within a single unpreemptible command packet, we can submit the copies
> and leave them to be scheduled without having to synchronously wait
> under a global lock. In order to manage migration, we need to
> preallocate the page tables (and keep them pinned and available for use
> at any time), causing a bottleneck for migrations as all clients must
> contend on the limited resources. By inlining the ppGTT updates and
> performing the blit atomically, each client only owns the PTE while in
> use, and so we can reschedule individual operations however we see fit.
> And most importantly, we do not need to take a global lock on the shared
> vm, and wait until the operation is complete before releasing the lock
> for others to claim the PTE for themselves.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
>  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543 ++++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
>  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
>  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
>  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
>  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
>  9 files changed, 900 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
>  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index ea8ee4b3e018..9f18902be626 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -109,6 +109,7 @@ gt-y += \
>         gt/intel_gtt.o \
>         gt/intel_llc.o \
>         gt/intel_lrc.o \
> +       gt/intel_migrate.o \
>         gt/intel_mocs.o \
>         gt/intel_ppgtt.o \
>         gt/intel_rc6.o \
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> index 0862c42b4cac..949965680c37 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
>  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT * sizeof(u32))
>  #define I915_GEM_HWS_SEQNO             0x40
>  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO * sizeof(u32))
> +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
>  #define I915_GEM_HWS_SCRATCH           0x80
>
>  #define I915_HWS_CSB_BUF0_INDEX                0x10
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 2694dbb9967e..1c3af0fc0456 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -123,8 +123,10 @@
>  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
>  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
>  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
>  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
>  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
>  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
>  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
>  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
> new file mode 100644
> index 000000000000..1f60f8ee36f8
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> @@ -0,0 +1,543 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#include "i915_drv.h"
> +#include "intel_context.h"
> +#include "intel_gpu_commands.h"
> +#include "intel_gt.h"
> +#include "intel_gtt.h"
> +#include "intel_migrate.h"
> +#include "intel_ring.h"
> +
> +struct insert_pte_data {
> +       u64 offset;
> +       bool is_lmem;
> +};
> +
> +#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
> +
> +static bool engine_supports_migration(struct intel_engine_cs *engine)
> +{
> +       if (!engine)
> +               return false;
> +
> +       /*
> +        * We need the ability to prevent aribtration (MI_ARB_ON_OFF),
> +        * the ability to write PTE using inline data (MI_STORE_DATA)
> +        * and of course the ability to do the block transfer (blits).
> +        */
> +       GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
> +
> +       return true;
> +}
> +
> +static void insert_pte(struct i915_address_space *vm,
> +                      struct i915_page_table *pt,
> +                      void *data)
> +{
> +       struct insert_pte_data *d = data;
> +
> +       vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
> +                       d->is_lmem ? PTE_LM : 0);
> +       d->offset += PAGE_SIZE;
> +}
> +
> +static struct i915_address_space *migrate_vm(struct intel_gt *gt)
> +{
> +       struct i915_vm_pt_stash stash = {};
> +       struct i915_ppgtt *vm;
> +       int err;
> +       int i;
> +
> +       /*
> +        * We construct a very special VM for use by all migration contexts,
> +        * it is kept pinned so that it can be used at any time. As we need
> +        * to pre-allocate the page directories for the migration VM, this
> +        * limits us to only using a small number of prepared vma.
> +        *
> +        * To be able to pipeline and reschedule migration operations while
> +        * avoiding unnecessary contention on the vm itself, the PTE updates
> +        * are inline with the blits. All the blits use the same fixed
> +        * addresses, with the backing store redirection being updated on the
> +        * fly. Only 2 implicit vma are used for all migration operations.
> +        *
> +        * We lay the ppGTT out as:
> +        *
> +        *      [0, CHUNK_SZ) -> first object
> +        *      [CHUNK_SZ, 2 * CHUNK_SZ) -> second object
> +        *      [2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] -> PTE
> +        *
> +        * By exposing the dma addresses of the page directories themselves
> +        * within the ppGTT, we are then able to rewrite the PTE prior to use.
> +        * But the PTE update and subsequent migration operation must be atomic,
> +        * i.e. within the same non-preemptible window so that we do not switch
> +        * to another migration context that overwrites the PTE.
> +        */
> +
> +       vm = i915_ppgtt_create(gt);
> +       if (IS_ERR(vm))
> +               return ERR_CAST(vm);
> +
> +       if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
> +               err = -ENODEV;
> +               goto err_vm;
> +       }
> +
> +       /*
> +        * Each engine instance is assigned its own chunk in the VM, so
> +        * that we can run multiple instances concurrently
> +        */
> +       for (i = 0; i < ARRAY_SIZE(gt->engine_class[COPY_ENGINE_CLASS]); i++) {
> +               struct intel_engine_cs *engine;
> +               u64 base = (u64)i << 32;
> +               struct insert_pte_data d = {};
> +               struct i915_gem_ww_ctx ww;
> +               u64 sz;
> +
> +               engine = gt->engine_class[COPY_ENGINE_CLASS][i];
> +               if (!engine_supports_migration(engine))
> +                       continue;
> +
> +               /*
> +                * We copy in 8MiB chunks. Each PDE covers 2MiB, so we need
> +                * 4x2 page directories for source/destination.
> +                */
> +               sz = 2 * CHUNK_SZ;
> +               d.offset = base + sz;
> +
> +               /*
> +                * We need another page directory setup so that we can write
> +                * the 8x512 PTE in each chunk.
> +                */
> +               sz += (sz >> 12) * sizeof(u64);
> +
> +               err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
> +               if (err)
> +                       goto err_vm;
> +
> +               for_i915_gem_ww(&ww, err, true) {
> +                       err = i915_vm_lock_objects(&vm->vm, &ww);
> +                       if (err)
> +                               continue;
> +                       err = i915_vm_map_pt_stash(&vm->vm, &stash);
> +                       if (err)
> +                               continue;
> +
> +                       vm->vm.allocate_va_range(&vm->vm, &stash, base, base + sz);
> +               }
> +               i915_vm_free_pt_stash(&vm->vm, &stash);
> +               if (err)
> +                       goto err_vm;
> +
> +               /* Now allow the GPU to rewrite the PTE via its own ppGTT */
> +               d.is_lmem = i915_gem_object_is_lmem(vm->vm.scratch[0]);
> +               vm->vm.foreach(&vm->vm, base, base + sz, insert_pte, &d);

Will this play nice with Xe HP where we have min page size
restrictions for the GTT + lmem? The page-table allocations sidestep
such restrictions since they were previously never inserted into the
GTT. Maybe we need the flat-ppGTT at some point? Perhaps add a TODO or
something?
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

On Tue, 2021-06-08 at 17:18 +0100, Matthew Auld wrote:
> On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
> <thomas.hellstrom@linux.intel.com> wrote:
> > 
> > From: Chris Wilson <chris@chris-wilson.co.uk>
> > 
> > If we pipeline the PTE updates and then do the copy of those pages
> > within a single unpreemptible command packet, we can submit the
> > copies
> > and leave them to be scheduled without having to synchronously wait
> > under a global lock. In order to manage migration, we need to
> > preallocate the page tables (and keep them pinned and available for
> > use
> > at any time), causing a bottleneck for migrations as all clients
> > must
> > contend on the limited resources. By inlining the ppGTT updates and
> > performing the blit atomically, each client only owns the PTE while
> > in
> > use, and so we can reschedule individual operations however we see
> > fit.
> > And most importantly, we do not need to take a global lock on the
> > shared
> > vm, and wait until the operation is complete before releasing the
> > lock
> > for others to claim the PTE for themselves.
> > 
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Co-developed-by: Thomas Hellström
> > <thomas.hellstrom@linux.intel.com>
> > Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/Makefile                 |   1 +
> >  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
> >  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
> >  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543
> > ++++++++++++++++++
> >  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
> >  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
> >  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
> >  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
> >  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
> >  9 files changed, 900 insertions(+)
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
> >  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
> > 
> > diff --git a/drivers/gpu/drm/i915/Makefile
> > b/drivers/gpu/drm/i915/Makefile
> > index ea8ee4b3e018..9f18902be626 100644
> > --- a/drivers/gpu/drm/i915/Makefile
> > +++ b/drivers/gpu/drm/i915/Makefile
> > @@ -109,6 +109,7 @@ gt-y += \
> >         gt/intel_gtt.o \
> >         gt/intel_llc.o \
> >         gt/intel_lrc.o \
> > +       gt/intel_migrate.o \
> >         gt/intel_mocs.o \
> >         gt/intel_ppgtt.o \
> >         gt/intel_rc6.o \
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h
> > b/drivers/gpu/drm/i915/gt/intel_engine.h
> > index 0862c42b4cac..949965680c37 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> > @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs
> > *engine, int reg, u32 value)
> >  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT *
> > sizeof(u32))
> >  #define I915_GEM_HWS_SEQNO             0x40
> >  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO
> > * sizeof(u32))
> > +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
> >  #define I915_GEM_HWS_SCRATCH           0x80
> > 
> >  #define I915_HWS_CSB_BUF0_INDEX                0x10
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > index 2694dbb9967e..1c3af0fc0456 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > @@ -123,8 +123,10 @@
> >  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
> >  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
> >  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> > +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
> >  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
> >  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> > +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
> >  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
> >  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
> >  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> > diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c
> > b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > new file mode 100644
> > index 000000000000..1f60f8ee36f8
> > --- /dev/null
> > +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > @@ -0,0 +1,543 @@
> > +// SPDX-License-Identifier: MIT
> > +/*
> > + * Copyright © 2020 Intel Corporation
> > + */
> > +
> > +#include "i915_drv.h"
> > +#include "intel_context.h"
> > +#include "intel_gpu_commands.h"
> > +#include "intel_gt.h"
> > +#include "intel_gtt.h"
> > +#include "intel_migrate.h"
> > +#include "intel_ring.h"
> > +
> > +struct insert_pte_data {
> > +       u64 offset;
> > +       bool is_lmem;
> > +};
> > +
> > +#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
> > +
> > +static bool engine_supports_migration(struct intel_engine_cs
> > *engine)
> > +{
> > +       if (!engine)
> > +               return false;
> > +
> > +       /*
> > +        * We need the ability to prevent aribtration
> > (MI_ARB_ON_OFF),
> > +        * the ability to write PTE using inline data
> > (MI_STORE_DATA)
> > +        * and of course the ability to do the block transfer
> > (blits).
> > +        */
> > +       GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
> > +
> > +       return true;
> > +}
> > +
> > +static void insert_pte(struct i915_address_space *vm,
> > +                      struct i915_page_table *pt,
> > +                      void *data)
> > +{
> > +       struct insert_pte_data *d = data;
> > +
> > +       vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
> > +                       d->is_lmem ? PTE_LM : 0);
> > +       d->offset += PAGE_SIZE;
> > +}
> > +
> > +static struct i915_address_space *migrate_vm(struct intel_gt *gt)
> > +{
> > +       struct i915_vm_pt_stash stash = {};
> > +       struct i915_ppgtt *vm;
> > +       int err;
> > +       int i;
> > +
> > +       /*
> > +        * We construct a very special VM for use by all migration
> > contexts,
> > +        * it is kept pinned so that it can be used at any time. As
> > we need
> > +        * to pre-allocate the page directories for the migration
> > VM, this
> > +        * limits us to only using a small number of prepared vma.
> > +        *
> > +        * To be able to pipeline and reschedule migration
> > operations while
> > +        * avoiding unnecessary contention on the vm itself, the
> > PTE updates
> > +        * are inline with the blits. All the blits use the same
> > fixed
> > +        * addresses, with the backing store redirection being
> > updated on the
> > +        * fly. Only 2 implicit vma are used for all migration
> > operations.
> > +        *
> > +        * We lay the ppGTT out as:
> > +        *
> > +        *      [0, CHUNK_SZ) -> first object
> > +        *      [CHUNK_SZ, 2 * CHUNK_SZ) -> second object
> > +        *      [2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] ->
> > PTE
> > +        *
> > +        * By exposing the dma addresses of the page directories
> > themselves
> > +        * within the ppGTT, we are then able to rewrite the PTE
> > prior to use.
> > +        * But the PTE update and subsequent migration operation
> > must be atomic,
> > +        * i.e. within the same non-preemptible window so that we
> > do not switch
> > +        * to another migration context that overwrites the PTE.
> > +        */
> > +
> > +       vm = i915_ppgtt_create(gt);
> > +       if (IS_ERR(vm))
> > +               return ERR_CAST(vm);
> > +
> > +       if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
> > +               err = -ENODEV;
> > +               goto err_vm;
> > +       }
> > +
> > +       /*
> > +        * Each engine instance is assigned its own chunk in the
> > VM, so
> > +        * that we can run multiple instances concurrently
> > +        */
> > +       for (i = 0; i < ARRAY_SIZE(gt-
> > >engine_class[COPY_ENGINE_CLASS]); i++) {
> > +               struct intel_engine_cs *engine;
> > +               u64 base = (u64)i << 32;
> > +               struct insert_pte_data d = {};
> > +               struct i915_gem_ww_ctx ww;
> > +               u64 sz;
> > +
> > +               engine = gt->engine_class[COPY_ENGINE_CLASS][i];
> > +               if (!engine_supports_migration(engine))
> > +                       continue;
> > +
> > +               /*
> > +                * We copy in 8MiB chunks. Each PDE covers 2MiB, so
> > we need
> > +                * 4x2 page directories for source/destination.
> > +                */
> > +               sz = 2 * CHUNK_SZ;
> > +               d.offset = base + sz;
> > +
> > +               /*
> > +                * We need another page directory setup so that we
> > can write
> > +                * the 8x512 PTE in each chunk.
> > +                */
> > +               sz += (sz >> 12) * sizeof(u64);
> > +
> > +               err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
> > +               if (err)
> > +                       goto err_vm;
> > +
> > +               for_i915_gem_ww(&ww, err, true) {
> > +                       err = i915_vm_lock_objects(&vm->vm, &ww);
> > +                       if (err)
> > +                               continue;
> > +                       err = i915_vm_map_pt_stash(&vm->vm,
> > &stash);
> > +                       if (err)
> > +                               continue;
> > +
> > +                       vm->vm.allocate_va_range(&vm->vm, &stash,
> > base, base + sz);
> > +               }
> > +               i915_vm_free_pt_stash(&vm->vm, &stash);
> > +               if (err)
> > +                       goto err_vm;
> > +
> > +               /* Now allow the GPU to rewrite the PTE via its own
> > ppGTT */
> > +               d.is_lmem = i915_gem_object_is_lmem(vm-
> > >vm.scratch[0]);
> > +               vm->vm.foreach(&vm->vm, base, base + sz,
> > insert_pte, &d);
> 
> Will this play nice with Xe HP where we have min page size
> restrictions for the GTT + lmem? The page-table allocations sidestep
> such restrictions since they were previously never inserted into the
> GTT. Maybe we need the flat-ppGTT at some point? Perhaps add a TODO
> or
> something?

I've previously discussed that with Chris, and apparently it should be
as easy as adjusting the sz >> 12 above. But yeah, Chris also brought
up the flat-ppGTT idea as something we should look into.

Mieanwhile, we should add a TODO.

/Thomas

Re: [Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

On Tue, 2021-06-08 at 17:18 +0100, Matthew Auld wrote:
> On Tue, 8 Jun 2021 at 10:29, Thomas Hellström
> <thomas.hellstrom@linux.intel.com> wrote:
> > 
> > From: Chris Wilson <chris@chris-wilson.co.uk>
> > 
> > If we pipeline the PTE updates and then do the copy of those pages
> > within a single unpreemptible command packet, we can submit the
> > copies
> > and leave them to be scheduled without having to synchronously wait
> > under a global lock. In order to manage migration, we need to
> > preallocate the page tables (and keep them pinned and available for
> > use
> > at any time), causing a bottleneck for migrations as all clients
> > must
> > contend on the limited resources. By inlining the ppGTT updates and
> > performing the blit atomically, each client only owns the PTE while
> > in
> > use, and so we can reschedule individual operations however we see
> > fit.
> > And most importantly, we do not need to take a global lock on the
> > shared
> > vm, and wait until the operation is complete before releasing the
> > lock
> > for others to claim the PTE for themselves.
> > 
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Co-developed-by: Thomas Hellström
> > <thomas.hellstrom@linux.intel.com>
> > Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/Makefile                 |   1 +
> >  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
> >  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
> >  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543
> > ++++++++++++++++++
> >  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
> >  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
> >  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
> >  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
> >  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
> >  9 files changed, 900 insertions(+)
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
> >  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
> >  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
> > 
> > diff --git a/drivers/gpu/drm/i915/Makefile
> > b/drivers/gpu/drm/i915/Makefile
> > index ea8ee4b3e018..9f18902be626 100644
> > --- a/drivers/gpu/drm/i915/Makefile
> > +++ b/drivers/gpu/drm/i915/Makefile
> > @@ -109,6 +109,7 @@ gt-y += \
> >         gt/intel_gtt.o \
> >         gt/intel_llc.o \
> >         gt/intel_lrc.o \
> > +       gt/intel_migrate.o \
> >         gt/intel_mocs.o \
> >         gt/intel_ppgtt.o \
> >         gt/intel_rc6.o \
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h
> > b/drivers/gpu/drm/i915/gt/intel_engine.h
> > index 0862c42b4cac..949965680c37 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> > @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs
> > *engine, int reg, u32 value)
> >  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT *
> > sizeof(u32))
> >  #define I915_GEM_HWS_SEQNO             0x40
> >  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO
> > * sizeof(u32))
> > +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
> >  #define I915_GEM_HWS_SCRATCH           0x80
> > 
> >  #define I915_HWS_CSB_BUF0_INDEX                0x10
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > index 2694dbb9967e..1c3af0fc0456 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> > @@ -123,8 +123,10 @@
> >  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
> >  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
> >  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> > +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
> >  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
> >  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> > +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
> >  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
> >  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
> >  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> > diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c
> > b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > new file mode 100644
> > index 000000000000..1f60f8ee36f8
> > --- /dev/null
> > +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> > @@ -0,0 +1,543 @@
> > +// SPDX-License-Identifier: MIT
> > +/*
> > + * Copyright © 2020 Intel Corporation
> > + */
> > +
> > +#include "i915_drv.h"
> > +#include "intel_context.h"
> > +#include "intel_gpu_commands.h"
> > +#include "intel_gt.h"
> > +#include "intel_gtt.h"
> > +#include "intel_migrate.h"
> > +#include "intel_ring.h"
> > +
> > +struct insert_pte_data {
> > +       u64 offset;
> > +       bool is_lmem;
> > +};
> > +
> > +#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */
> > +
> > +static bool engine_supports_migration(struct intel_engine_cs
> > *engine)
> > +{
> > +       if (!engine)
> > +               return false;
> > +
> > +       /*
> > +        * We need the ability to prevent aribtration
> > (MI_ARB_ON_OFF),
> > +        * the ability to write PTE using inline data
> > (MI_STORE_DATA)
> > +        * and of course the ability to do the block transfer
> > (blits).
> > +        */
> > +       GEM_BUG_ON(engine->class != COPY_ENGINE_CLASS);
> > +
> > +       return true;
> > +}
> > +
> > +static void insert_pte(struct i915_address_space *vm,
> > +                      struct i915_page_table *pt,
> > +                      void *data)
> > +{
> > +       struct insert_pte_data *d = data;
> > +
> > +       vm->insert_page(vm, px_dma(pt), d->offset, I915_CACHE_NONE,
> > +                       d->is_lmem ? PTE_LM : 0);
> > +       d->offset += PAGE_SIZE;
> > +}
> > +
> > +static struct i915_address_space *migrate_vm(struct intel_gt *gt)
> > +{
> > +       struct i915_vm_pt_stash stash = {};
> > +       struct i915_ppgtt *vm;
> > +       int err;
> > +       int i;
> > +
> > +       /*
> > +        * We construct a very special VM for use by all migration
> > contexts,
> > +        * it is kept pinned so that it can be used at any time. As
> > we need
> > +        * to pre-allocate the page directories for the migration
> > VM, this
> > +        * limits us to only using a small number of prepared vma.
> > +        *
> > +        * To be able to pipeline and reschedule migration
> > operations while
> > +        * avoiding unnecessary contention on the vm itself, the
> > PTE updates
> > +        * are inline with the blits. All the blits use the same
> > fixed
> > +        * addresses, with the backing store redirection being
> > updated on the
> > +        * fly. Only 2 implicit vma are used for all migration
> > operations.
> > +        *
> > +        * We lay the ppGTT out as:
> > +        *
> > +        *      [0, CHUNK_SZ) -> first object
> > +        *      [CHUNK_SZ, 2 * CHUNK_SZ) -> second object
> > +        *      [2 * CHUNK_SZ, 2 * CHUNK_SZ + 2 * CHUNK_SZ >> 9] ->
> > PTE
> > +        *
> > +        * By exposing the dma addresses of the page directories
> > themselves
> > +        * within the ppGTT, we are then able to rewrite the PTE
> > prior to use.
> > +        * But the PTE update and subsequent migration operation
> > must be atomic,
> > +        * i.e. within the same non-preemptible window so that we
> > do not switch
> > +        * to another migration context that overwrites the PTE.
> > +        */
> > +
> > +       vm = i915_ppgtt_create(gt);
> > +       if (IS_ERR(vm))
> > +               return ERR_CAST(vm);
> > +
> > +       if (!vm->vm.allocate_va_range || !vm->vm.foreach) {
> > +               err = -ENODEV;
> > +               goto err_vm;
> > +       }
> > +
> > +       /*
> > +        * Each engine instance is assigned its own chunk in the
> > VM, so
> > +        * that we can run multiple instances concurrently
> > +        */
> > +       for (i = 0; i < ARRAY_SIZE(gt-
> > >engine_class[COPY_ENGINE_CLASS]); i++) {
> > +               struct intel_engine_cs *engine;
> > +               u64 base = (u64)i << 32;
> > +               struct insert_pte_data d = {};
> > +               struct i915_gem_ww_ctx ww;
> > +               u64 sz;
> > +
> > +               engine = gt->engine_class[COPY_ENGINE_CLASS][i];
> > +               if (!engine_supports_migration(engine))
> > +                       continue;
> > +
> > +               /*
> > +                * We copy in 8MiB chunks. Each PDE covers 2MiB, so
> > we need
> > +                * 4x2 page directories for source/destination.
> > +                */
> > +               sz = 2 * CHUNK_SZ;
> > +               d.offset = base + sz;
> > +
> > +               /*
> > +                * We need another page directory setup so that we
> > can write
> > +                * the 8x512 PTE in each chunk.
> > +                */
> > +               sz += (sz >> 12) * sizeof(u64);
> > +
> > +               err = i915_vm_alloc_pt_stash(&vm->vm, &stash, sz);
> > +               if (err)
> > +                       goto err_vm;
> > +
> > +               for_i915_gem_ww(&ww, err, true) {
> > +                       err = i915_vm_lock_objects(&vm->vm, &ww);
> > +                       if (err)
> > +                               continue;
> > +                       err = i915_vm_map_pt_stash(&vm->vm,
> > &stash);
> > +                       if (err)
> > +                               continue;
> > +
> > +                       vm->vm.allocate_va_range(&vm->vm, &stash,
> > base, base + sz);
> > +               }
> > +               i915_vm_free_pt_stash(&vm->vm, &stash);
> > +               if (err)
> > +                       goto err_vm;
> > +
> > +               /* Now allow the GPU to rewrite the PTE via its own
> > ppGTT */
> > +               d.is_lmem = i915_gem_object_is_lmem(vm-
> > >vm.scratch[0]);
> > +               vm->vm.foreach(&vm->vm, base, base + sz,
> > insert_pte, &d);
> 
> Will this play nice with Xe HP where we have min page size
> restrictions for the GTT + lmem? The page-table allocations sidestep
> such restrictions since they were previously never inserted into the
> GTT. Maybe we need the flat-ppGTT at some point? Perhaps add a TODO
> or
> something?

I've previously discussed that with Chris, and apparently it should be
as easy as adjusting the sz >> 12 above. But yeah, Chris also brought
up the flat-ppGTT idea as something we should look into.

Mieanwhile, we should add a TODO.

/Thomas



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Intel-gfx@lists.freedesktop.org
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Re: [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

On Tue, 2021-06-08 at 11:28 +0200, Thomas Hellström wrote:
> From: Chris Wilson <chris@chris-wilson.co.uk>
> 
> If we pipeline the PTE updates and then do the copy of those pages
> within a single unpreemptible command packet, we can submit the
> copies
> and leave them to be scheduled without having to synchronously wait
> under a global lock. In order to manage migration, we need to
> preallocate the page tables (and keep them pinned and available for
> use
> at any time), causing a bottleneck for migrations as all clients must
> contend on the limited resources. By inlining the ppGTT updates and
> performing the blit atomically, each client only owns the PTE while
> in
> use, and so we can reschedule individual operations however we see
> fit.
> And most importantly, we do not need to take a global lock on the
> shared
> vm, and wait until the operation is complete before releasing the
> lock
> for others to claim the PTE for themselves.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
>  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543
> ++++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
>  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
>  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
>  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
>  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
>  9 files changed, 900 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
>  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
> 
> diff --git a/drivers/gpu/drm/i915/Makefile
> b/drivers/gpu/drm/i915/Makefile
> index ea8ee4b3e018..9f18902be626 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -109,6 +109,7 @@ gt-y += \
>         gt/intel_gtt.o \
>         gt/intel_llc.o \
>         gt/intel_lrc.o \
> +       gt/intel_migrate.o \
>         gt/intel_mocs.o \
>         gt/intel_ppgtt.o \
>         gt/intel_rc6.o \
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h
> b/drivers/gpu/drm/i915/gt/intel_engine.h
> index 0862c42b4cac..949965680c37 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs
> *engine, int reg, u32 value)
>  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT *
> sizeof(u32))
>  #define I915_GEM_HWS_SEQNO             0x40
>  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO *
> sizeof(u32))
> +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
>  #define I915_GEM_HWS_SCRATCH           0x80
>  
>  #define I915_HWS_CSB_BUF0_INDEX                0x10
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 2694dbb9967e..1c3af0fc0456 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -123,8 +123,10 @@
>  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
>  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
>  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
>  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
>  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
>  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
>  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
>  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c
> b/drivers/gpu/drm/i915/gt/intel_migrate.c
> new file mode 100644
> index 000000000000..1f60f8ee36f8
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> @@ -0,0 +1,543 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#include "i915_drv.h"
> +#include "intel_context.h"
> +#include "intel_gpu_commands.h"
> +#include "intel_gt.h"
> +#include "intel_gtt.h"
> +#include "intel_migrate.h"
> +#include "intel_ring.h"
> +
> 
...
> +
> +void intel_migrate_fini(struct intel_migrate *m)
> +{
> +       struct intel_context *ce;
> +
> +       ce = fetch_and_zero(&m->context);
> +       if (!ce)
> +               return;
> +
> +       intel_context_unpin(ce);
> +       intel_context_put(ce);
> +}

Hmm, CI hints at we should be exporting and using an
intel_engine_destroy_pinned_context() here...

/Thomas

Re: [Intel-gfx] [PATCH 7/9] drm/i915/gt: Pipelined page migration

[Thomas Hellström]

On Tue, 2021-06-08 at 11:28 +0200, Thomas Hellström wrote:
> From: Chris Wilson <chris@chris-wilson.co.uk>
> 
> If we pipeline the PTE updates and then do the copy of those pages
> within a single unpreemptible command packet, we can submit the
> copies
> and leave them to be scheduled without having to synchronously wait
> under a global lock. In order to manage migration, we need to
> preallocate the page tables (and keep them pinned and available for
> use
> at any time), causing a bottleneck for migrations as all clients must
> contend on the limited resources. By inlining the ppGTT updates and
> performing the blit atomically, each client only owns the PTE while
> in
> use, and so we can reschedule individual operations however we see
> fit.
> And most importantly, we do not need to take a global lock on the
> shared
> vm, and wait until the operation is complete before releasing the
> lock
> for others to claim the PTE for themselves.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |   2 +
>  drivers/gpu/drm/i915/gt/intel_migrate.c       | 543
> ++++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_migrate.h       |  45 ++
>  drivers/gpu/drm/i915/gt/intel_migrate_types.h |  15 +
>  drivers/gpu/drm/i915/gt/intel_ring.h          |   1 +
>  drivers/gpu/drm/i915/gt/selftest_migrate.c    | 291 ++++++++++
>  .../drm/i915/selftests/i915_live_selftests.h  |   1 +
>  9 files changed, 900 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.c
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate.h
>  create mode 100644 drivers/gpu/drm/i915/gt/intel_migrate_types.h
>  create mode 100644 drivers/gpu/drm/i915/gt/selftest_migrate.c
> 
> diff --git a/drivers/gpu/drm/i915/Makefile
> b/drivers/gpu/drm/i915/Makefile
> index ea8ee4b3e018..9f18902be626 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -109,6 +109,7 @@ gt-y += \
>         gt/intel_gtt.o \
>         gt/intel_llc.o \
>         gt/intel_lrc.o \
> +       gt/intel_migrate.o \
>         gt/intel_mocs.o \
>         gt/intel_ppgtt.o \
>         gt/intel_rc6.o \
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h
> b/drivers/gpu/drm/i915/gt/intel_engine.h
> index 0862c42b4cac..949965680c37 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -188,6 +188,7 @@ intel_write_status_page(struct intel_engine_cs
> *engine, int reg, u32 value)
>  #define I915_GEM_HWS_PREEMPT_ADDR      (I915_GEM_HWS_PREEMPT *
> sizeof(u32))
>  #define I915_GEM_HWS_SEQNO             0x40
>  #define I915_GEM_HWS_SEQNO_ADDR                (I915_GEM_HWS_SEQNO *
> sizeof(u32))
> +#define I915_GEM_HWS_MIGRATE           (0x42 * sizeof(u32))
>  #define I915_GEM_HWS_SCRATCH           0x80
>  
>  #define I915_HWS_CSB_BUF0_INDEX                0x10
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 2694dbb9967e..1c3af0fc0456 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -123,8 +123,10 @@
>  #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
>  #define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
>  #define   MI_SEMAPHORE_TOKEN_SHIFT     5
> +#define MI_STORE_DATA_IMM      MI_INSTR(0x20, 0)
>  #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
>  #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
> +#define MI_STORE_QWORD_IMM_GEN8 (MI_INSTR(0x20, 3) | REG_BIT(21))
>  #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
>  #define   MI_USE_GGTT          (1 << 22) /* g4x+ */
>  #define MI_STORE_DWORD_INDEX   MI_INSTR(0x21, 1)
> diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c
> b/drivers/gpu/drm/i915/gt/intel_migrate.c
> new file mode 100644
> index 000000000000..1f60f8ee36f8
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> @@ -0,0 +1,543 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#include "i915_drv.h"
> +#include "intel_context.h"
> +#include "intel_gpu_commands.h"
> +#include "intel_gt.h"
> +#include "intel_gtt.h"
> +#include "intel_migrate.h"
> +#include "intel_ring.h"
> +
> 
...
> +
> +void intel_migrate_fini(struct intel_migrate *m)
> +{
> +       struct intel_context *ce;
> +
> +       ce = fetch_and_zero(&m->context);
> +       if (!ce)
> +               return;
> +
> +       intel_context_unpin(ce);
> +       intel_context_put(ce);
> +}

Hmm, CI hints at we should be exporting and using an
intel_engine_destroy_pinned_context() here...

/Thomas



_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 8/9] drm/i915/gt: Pipelined clear

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Update the PTE and emit a clear within a single unpreemptible packet
such that we can schedule and pipeline clears.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_migrate.c    | 141 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h    |  20 +++
 drivers/gpu/drm/i915/gt/selftest_migrate.c | 163 +++++++++++++++++++++
 3 files changed, 324 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index 1f60f8ee36f8..9b8178a79ad3 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -488,6 +488,112 @@ intel_context_migrate_copy(struct intel_context *ce,
 	return err;
 }
 
+static int emit_clear(struct i915_request *rq, int size, u32 value)
+{
+	const int gen = INTEL_GEN(rq->engine->i915);
+	u32 *cs;
+
+	GEM_BUG_ON(size >> PAGE_SHIFT > S16_MAX);
+
+	cs = intel_ring_begin(rq, gen >= 8 ? 8 : 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (gen >= 8) {
+		*cs++ = XY_COLOR_BLT_CMD | BLT_WRITE_RGBA | (7 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = 0; /* offset */
+		*cs++ = 0;
+		*cs++ = value;
+		*cs++ = MI_NOOP;
+	} else {
+		*cs++ = XY_COLOR_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = 0;
+		*cs++ = value;
+	}
+
+	intel_ring_advance(rq, cs);
+	return 0;
+}
+
+int
+intel_context_migrate_clear(struct intel_context *ce,
+			    struct dma_fence *await,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    u32 value,
+			    struct i915_request **out)
+{
+	struct sgt_dma it = sg_sgt(sg);
+	struct i915_request *rq;
+	int err;
+
+	*out = NULL;
+
+	GEM_BUG_ON(ce->ring->size < SZ_64K);
+
+	do {
+		int len;
+
+		rq = i915_request_create(ce);
+		if (IS_ERR(rq)) {
+			err = PTR_ERR(rq);
+			goto out_ce;
+		}
+
+		if (await) {
+			err = i915_request_await_dma_fence(rq, await);
+			if (err)
+				goto out_rq;
+
+			if (rq->engine->emit_init_breadcrumb) {
+				err = rq->engine->emit_init_breadcrumb(rq);
+				if (err)
+					goto out_rq;
+			}
+
+			await = NULL;
+		}
+
+		/* The PTE updates + clear must not be interrupted. */
+		err = emit_no_arbitration(rq);
+		if (err)
+			goto out_rq;
+
+		len = emit_pte(rq, &it, cache_level, is_lmem, 0, CHUNK_SZ);
+		if (len <= 0) {
+			err = len;
+			goto out_rq;
+		}
+
+		err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+		if (err)
+			goto out_rq;
+
+		err = emit_clear(rq, len, value);
+
+		/* Arbitration is re-enabled between requests. */
+out_rq:
+		if (*out)
+			i915_request_put(*out);
+		*out = i915_request_get(rq);
+		i915_request_add(rq);
+		if (err || !it.sg || !sg_dma_len(it.sg))
+			break;
+
+		cond_resched();
+	} while (1);
+
+out_ce:
+	return err;
+}
+
 int intel_migrate_copy(struct intel_migrate *m,
 		       struct i915_gem_ww_ctx *ww,
 		       struct dma_fence *await,
@@ -526,6 +632,41 @@ int intel_migrate_copy(struct intel_migrate *m,
 	return err;
 }
 
+int
+intel_migrate_clear(struct intel_migrate *m,
+		    struct i915_gem_ww_ctx *ww,
+		    struct dma_fence *await,
+		    struct scatterlist *sg,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u32 value,
+		    struct i915_request **out)
+{
+	struct intel_context *ce;
+	int err;
+
+	*out = NULL;
+	if (!m->context)
+		return -ENODEV;
+
+	ce = intel_migrate_create_context(m);
+	if (IS_ERR(ce))
+		ce = intel_context_get(m->context);
+	GEM_BUG_ON(IS_ERR(ce));
+
+	err = intel_context_pin_ww(ce, ww);
+	if (err)
+		goto out;
+
+	err = intel_context_migrate_clear(ce, await, sg, cache_level,
+					  is_lmem, value, out);
+
+	intel_context_unpin(ce);
+out:
+	intel_context_put(ce);
+	return err;
+}
+
 void intel_migrate_fini(struct intel_migrate *m)
 {
 	struct intel_context *ce;
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.h b/drivers/gpu/drm/i915/gt/intel_migrate.h
index 32c61190ed73..4e18e755a00b 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.h
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.h
@@ -6,6 +6,8 @@
 #ifndef __INTEL_MIGRATE__
 #define __INTEL_MIGRATE__
 
+#include <linux/types.h>
+
 #include "intel_migrate_types.h"
 
 struct dma_fence;
@@ -40,6 +42,24 @@ int intel_context_migrate_copy(struct intel_context *ce,
 			       bool dst_is_lmem,
 			       struct i915_request **out);
 
+int
+intel_migrate_clear(struct intel_migrate *m,
+		    struct i915_gem_ww_ctx *ww,
+		    struct dma_fence *await,
+		    struct scatterlist *sg,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u32 value,
+		    struct i915_request **out);
+int
+intel_context_migrate_clear(struct intel_context *ce,
+			    struct dma_fence *await,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    u32 value,
+			    struct i915_request **out);
+
 void intel_migrate_fini(struct intel_migrate *m);
 
 #endif /* __INTEL_MIGRATE__ */
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
index 9784d149ebf1..159c8656e1b0 100644
--- a/drivers/gpu/drm/i915/gt/selftest_migrate.c
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -129,6 +129,82 @@ static int copy(struct intel_migrate *migrate,
 	return err;
 }
 
+static int clear(struct intel_migrate *migrate,
+		 int (*fn)(struct intel_migrate *migrate,
+			   struct i915_gem_ww_ctx *ww,
+			   struct drm_i915_gem_object *obj,
+			   u32 value,
+			   struct i915_request **out),
+		 u32 sz, struct rnd_state *prng)
+{
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	struct drm_i915_gem_object *obj;
+	struct i915_request *rq;
+	struct i915_gem_ww_ctx ww;
+	u32 *vaddr;
+	int err = 0;
+	int i;
+
+	obj = create_lmem_or_internal(i915, sz);
+	if (IS_ERR(obj))
+		return 0;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(obj, &ww);
+		if (err)
+			continue;
+
+		vaddr = i915_gem_object_pin_map(obj, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			continue;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = ~i;
+		i915_gem_object_flush_map(obj);
+
+		err = fn(migrate, &ww, obj, sz, &rq);
+		if (!err)
+			continue;
+
+		if (err != -EDEADLK && err != -EINTR && err != -ERESTARTSYS)
+			pr_err("%ps failed, size: %u\n", fn, sz);
+		if (rq) {
+			i915_request_wait(rq, 0, HZ);
+			i915_request_put(rq);
+		}
+		i915_gem_object_unpin_map(obj);
+	}
+	if (err)
+		goto err_out;
+
+	if (rq) {
+		if (i915_request_wait(rq, 0, HZ) < 0) {
+			pr_err("%ps timed out, size: %u\n", fn, sz);
+			err = -ETIME;
+		}
+		i915_request_put(rq);
+	}
+
+	for (i = 0; !err && i < sz / PAGE_SIZE; i++) {
+		int x = i * 1024 + i915_prandom_u32_max_state(1024, prng);
+
+		if (vaddr[x] != sz) {
+			pr_err("%ps failed, size: %u, offset: %zu\n",
+			       fn, sz, x * sizeof(u32));
+			igt_hexdump(vaddr + i * 1024, 4096);
+			err = -EINVAL;
+		}
+	}
+
+	i915_gem_object_unpin_map(obj);
+err_out:
+	i915_gem_object_put(obj);
+
+	return err;
+}
+
 static int __migrate_copy(struct intel_migrate *migrate,
 			  struct i915_gem_ww_ctx *ww,
 			  struct drm_i915_gem_object *src,
@@ -169,6 +245,44 @@ global_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
 	return copy(migrate, __global_copy, sz, prng);
 }
 
+static int __migrate_clear(struct intel_migrate *migrate,
+			   struct i915_gem_ww_ctx *ww,
+			   struct drm_i915_gem_object *obj,
+			   u32 value,
+			   struct i915_request **out)
+{
+	return intel_migrate_clear(migrate, ww, NULL,
+				   obj->mm.pages->sgl,
+				   obj->cache_level,
+				   i915_gem_object_is_lmem(obj),
+				   value, out);
+}
+
+static int __global_clear(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *obj,
+			  u32 value,
+			  struct i915_request **out)
+{
+	return intel_context_migrate_clear(migrate->context, NULL,
+					   obj->mm.pages->sgl,
+					   obj->cache_level,
+					   i915_gem_object_is_lmem(obj),
+					   value, out);
+}
+
+static int
+migrate_clear(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return clear(migrate, __migrate_clear, sz, prng);
+}
+
+static int
+global_clear(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return clear(migrate, __global_clear, sz, prng);
+}
+
 static int live_migrate_copy(void *arg)
 {
 	struct intel_migrate *migrate = arg;
@@ -190,6 +304,28 @@ static int live_migrate_copy(void *arg)
 	return 0;
 }
 
+static int live_migrate_clear(void *arg)
+{
+	struct intel_migrate *migrate = arg;
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		int err;
+
+		err = migrate_clear(migrate, sizes[i], &prng);
+		if (err == 0)
+			err = global_clear(migrate, sizes[i], &prng);
+
+		i915_gem_drain_freed_objects(i915);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 struct threaded_migrate {
 	struct intel_migrate *migrate;
 	struct task_struct *tsk;
@@ -271,12 +407,39 @@ static int thread_global_copy(void *arg)
 	return threaded_migrate(arg, __thread_global_copy, 0);
 }
 
+static int __thread_migrate_clear(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return migrate_clear(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int __thread_global_clear(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return global_clear(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_migrate_clear(void *arg)
+{
+	return threaded_migrate(arg, __thread_migrate_clear, 0);
+}
+
+static int thread_global_clear(void *arg)
+{
+	return threaded_migrate(arg, __thread_global_clear, 0);
+}
+
 int intel_migrate_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(live_migrate_copy),
+		SUBTEST(live_migrate_clear),
 		SUBTEST(thread_migrate_copy),
+		SUBTEST(thread_migrate_clear),
 		SUBTEST(thread_global_copy),
+		SUBTEST(thread_global_clear),
 	};
 	struct intel_migrate m;
 	int err;
-- 
2.31.1

[Intel-gfx] [PATCH 8/9] drm/i915/gt: Pipelined clear

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Update the PTE and emit a clear within a single unpreemptible packet
such that we can schedule and pipeline clears.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_migrate.c    | 141 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_migrate.h    |  20 +++
 drivers/gpu/drm/i915/gt/selftest_migrate.c | 163 +++++++++++++++++++++
 3 files changed, 324 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index 1f60f8ee36f8..9b8178a79ad3 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -488,6 +488,112 @@ intel_context_migrate_copy(struct intel_context *ce,
 	return err;
 }
 
+static int emit_clear(struct i915_request *rq, int size, u32 value)
+{
+	const int gen = INTEL_GEN(rq->engine->i915);
+	u32 *cs;
+
+	GEM_BUG_ON(size >> PAGE_SHIFT > S16_MAX);
+
+	cs = intel_ring_begin(rq, gen >= 8 ? 8 : 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (gen >= 8) {
+		*cs++ = XY_COLOR_BLT_CMD | BLT_WRITE_RGBA | (7 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = 0; /* offset */
+		*cs++ = 0;
+		*cs++ = value;
+		*cs++ = MI_NOOP;
+	} else {
+		*cs++ = XY_COLOR_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
+		*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | PAGE_SIZE;
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = 0;
+		*cs++ = value;
+	}
+
+	intel_ring_advance(rq, cs);
+	return 0;
+}
+
+int
+intel_context_migrate_clear(struct intel_context *ce,
+			    struct dma_fence *await,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    u32 value,
+			    struct i915_request **out)
+{
+	struct sgt_dma it = sg_sgt(sg);
+	struct i915_request *rq;
+	int err;
+
+	*out = NULL;
+
+	GEM_BUG_ON(ce->ring->size < SZ_64K);
+
+	do {
+		int len;
+
+		rq = i915_request_create(ce);
+		if (IS_ERR(rq)) {
+			err = PTR_ERR(rq);
+			goto out_ce;
+		}
+
+		if (await) {
+			err = i915_request_await_dma_fence(rq, await);
+			if (err)
+				goto out_rq;
+
+			if (rq->engine->emit_init_breadcrumb) {
+				err = rq->engine->emit_init_breadcrumb(rq);
+				if (err)
+					goto out_rq;
+			}
+
+			await = NULL;
+		}
+
+		/* The PTE updates + clear must not be interrupted. */
+		err = emit_no_arbitration(rq);
+		if (err)
+			goto out_rq;
+
+		len = emit_pte(rq, &it, cache_level, is_lmem, 0, CHUNK_SZ);
+		if (len <= 0) {
+			err = len;
+			goto out_rq;
+		}
+
+		err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+		if (err)
+			goto out_rq;
+
+		err = emit_clear(rq, len, value);
+
+		/* Arbitration is re-enabled between requests. */
+out_rq:
+		if (*out)
+			i915_request_put(*out);
+		*out = i915_request_get(rq);
+		i915_request_add(rq);
+		if (err || !it.sg || !sg_dma_len(it.sg))
+			break;
+
+		cond_resched();
+	} while (1);
+
+out_ce:
+	return err;
+}
+
 int intel_migrate_copy(struct intel_migrate *m,
 		       struct i915_gem_ww_ctx *ww,
 		       struct dma_fence *await,
@@ -526,6 +632,41 @@ int intel_migrate_copy(struct intel_migrate *m,
 	return err;
 }
 
+int
+intel_migrate_clear(struct intel_migrate *m,
+		    struct i915_gem_ww_ctx *ww,
+		    struct dma_fence *await,
+		    struct scatterlist *sg,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u32 value,
+		    struct i915_request **out)
+{
+	struct intel_context *ce;
+	int err;
+
+	*out = NULL;
+	if (!m->context)
+		return -ENODEV;
+
+	ce = intel_migrate_create_context(m);
+	if (IS_ERR(ce))
+		ce = intel_context_get(m->context);
+	GEM_BUG_ON(IS_ERR(ce));
+
+	err = intel_context_pin_ww(ce, ww);
+	if (err)
+		goto out;
+
+	err = intel_context_migrate_clear(ce, await, sg, cache_level,
+					  is_lmem, value, out);
+
+	intel_context_unpin(ce);
+out:
+	intel_context_put(ce);
+	return err;
+}
+
 void intel_migrate_fini(struct intel_migrate *m)
 {
 	struct intel_context *ce;
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.h b/drivers/gpu/drm/i915/gt/intel_migrate.h
index 32c61190ed73..4e18e755a00b 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.h
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.h
@@ -6,6 +6,8 @@
 #ifndef __INTEL_MIGRATE__
 #define __INTEL_MIGRATE__
 
+#include <linux/types.h>
+
 #include "intel_migrate_types.h"
 
 struct dma_fence;
@@ -40,6 +42,24 @@ int intel_context_migrate_copy(struct intel_context *ce,
 			       bool dst_is_lmem,
 			       struct i915_request **out);
 
+int
+intel_migrate_clear(struct intel_migrate *m,
+		    struct i915_gem_ww_ctx *ww,
+		    struct dma_fence *await,
+		    struct scatterlist *sg,
+		    enum i915_cache_level cache_level,
+		    bool is_lmem,
+		    u32 value,
+		    struct i915_request **out);
+int
+intel_context_migrate_clear(struct intel_context *ce,
+			    struct dma_fence *await,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    u32 value,
+			    struct i915_request **out);
+
 void intel_migrate_fini(struct intel_migrate *m);
 
 #endif /* __INTEL_MIGRATE__ */
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
index 9784d149ebf1..159c8656e1b0 100644
--- a/drivers/gpu/drm/i915/gt/selftest_migrate.c
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -129,6 +129,82 @@ static int copy(struct intel_migrate *migrate,
 	return err;
 }
 
+static int clear(struct intel_migrate *migrate,
+		 int (*fn)(struct intel_migrate *migrate,
+			   struct i915_gem_ww_ctx *ww,
+			   struct drm_i915_gem_object *obj,
+			   u32 value,
+			   struct i915_request **out),
+		 u32 sz, struct rnd_state *prng)
+{
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	struct drm_i915_gem_object *obj;
+	struct i915_request *rq;
+	struct i915_gem_ww_ctx ww;
+	u32 *vaddr;
+	int err = 0;
+	int i;
+
+	obj = create_lmem_or_internal(i915, sz);
+	if (IS_ERR(obj))
+		return 0;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(obj, &ww);
+		if (err)
+			continue;
+
+		vaddr = i915_gem_object_pin_map(obj, I915_MAP_WC);
+		if (IS_ERR(vaddr)) {
+			err = PTR_ERR(vaddr);
+			continue;
+		}
+
+		for (i = 0; i < sz / sizeof(u32); i++)
+			vaddr[i] = ~i;
+		i915_gem_object_flush_map(obj);
+
+		err = fn(migrate, &ww, obj, sz, &rq);
+		if (!err)
+			continue;
+
+		if (err != -EDEADLK && err != -EINTR && err != -ERESTARTSYS)
+			pr_err("%ps failed, size: %u\n", fn, sz);
+		if (rq) {
+			i915_request_wait(rq, 0, HZ);
+			i915_request_put(rq);
+		}
+		i915_gem_object_unpin_map(obj);
+	}
+	if (err)
+		goto err_out;
+
+	if (rq) {
+		if (i915_request_wait(rq, 0, HZ) < 0) {
+			pr_err("%ps timed out, size: %u\n", fn, sz);
+			err = -ETIME;
+		}
+		i915_request_put(rq);
+	}
+
+	for (i = 0; !err && i < sz / PAGE_SIZE; i++) {
+		int x = i * 1024 + i915_prandom_u32_max_state(1024, prng);
+
+		if (vaddr[x] != sz) {
+			pr_err("%ps failed, size: %u, offset: %zu\n",
+			       fn, sz, x * sizeof(u32));
+			igt_hexdump(vaddr + i * 1024, 4096);
+			err = -EINVAL;
+		}
+	}
+
+	i915_gem_object_unpin_map(obj);
+err_out:
+	i915_gem_object_put(obj);
+
+	return err;
+}
+
 static int __migrate_copy(struct intel_migrate *migrate,
 			  struct i915_gem_ww_ctx *ww,
 			  struct drm_i915_gem_object *src,
@@ -169,6 +245,44 @@ global_copy(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
 	return copy(migrate, __global_copy, sz, prng);
 }
 
+static int __migrate_clear(struct intel_migrate *migrate,
+			   struct i915_gem_ww_ctx *ww,
+			   struct drm_i915_gem_object *obj,
+			   u32 value,
+			   struct i915_request **out)
+{
+	return intel_migrate_clear(migrate, ww, NULL,
+				   obj->mm.pages->sgl,
+				   obj->cache_level,
+				   i915_gem_object_is_lmem(obj),
+				   value, out);
+}
+
+static int __global_clear(struct intel_migrate *migrate,
+			  struct i915_gem_ww_ctx *ww,
+			  struct drm_i915_gem_object *obj,
+			  u32 value,
+			  struct i915_request **out)
+{
+	return intel_context_migrate_clear(migrate->context, NULL,
+					   obj->mm.pages->sgl,
+					   obj->cache_level,
+					   i915_gem_object_is_lmem(obj),
+					   value, out);
+}
+
+static int
+migrate_clear(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return clear(migrate, __migrate_clear, sz, prng);
+}
+
+static int
+global_clear(struct intel_migrate *migrate, u32 sz, struct rnd_state *prng)
+{
+	return clear(migrate, __global_clear, sz, prng);
+}
+
 static int live_migrate_copy(void *arg)
 {
 	struct intel_migrate *migrate = arg;
@@ -190,6 +304,28 @@ static int live_migrate_copy(void *arg)
 	return 0;
 }
 
+static int live_migrate_clear(void *arg)
+{
+	struct intel_migrate *migrate = arg;
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		int err;
+
+		err = migrate_clear(migrate, sizes[i], &prng);
+		if (err == 0)
+			err = global_clear(migrate, sizes[i], &prng);
+
+		i915_gem_drain_freed_objects(i915);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 struct threaded_migrate {
 	struct intel_migrate *migrate;
 	struct task_struct *tsk;
@@ -271,12 +407,39 @@ static int thread_global_copy(void *arg)
 	return threaded_migrate(arg, __thread_global_copy, 0);
 }
 
+static int __thread_migrate_clear(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return migrate_clear(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int __thread_global_clear(void *arg)
+{
+	struct threaded_migrate *tm = arg;
+
+	return global_clear(tm->migrate, 2 * CHUNK_SZ, &tm->prng);
+}
+
+static int thread_migrate_clear(void *arg)
+{
+	return threaded_migrate(arg, __thread_migrate_clear, 0);
+}
+
+static int thread_global_clear(void *arg)
+{
+	return threaded_migrate(arg, __thread_global_clear, 0);
+}
+
 int intel_migrate_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(live_migrate_copy),
+		SUBTEST(live_migrate_clear),
 		SUBTEST(thread_migrate_copy),
+		SUBTEST(thread_migrate_clear),
 		SUBTEST(thread_global_copy),
+		SUBTEST(thread_global_clear),
 	};
 	struct intel_migrate m;
 	int err;
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 9/9] drm/i915/gt: Setup a default migration context on the GT

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Set up a default migration context on the GT and use it from the
selftests.
Add a perf selftest and make sure we exercise LMEM if available.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.c            |   4 +
 drivers/gpu/drm/i915/gt/intel_gt_types.h      |   3 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       |   4 +-
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 227 +++++++++++++++++-
 .../drm/i915/selftests/i915_perf_selftests.h  |   1 +
 5 files changed, 232 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 2161bf01ef8b..67ef057ae918 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -13,6 +13,7 @@
 #include "intel_gt_clock_utils.h"
 #include "intel_gt_pm.h"
 #include "intel_gt_requests.h"
+#include "intel_migrate.h"
 #include "intel_mocs.h"
 #include "intel_rc6.h"
 #include "intel_renderstate.h"
@@ -626,6 +627,8 @@ int intel_gt_init(struct intel_gt *gt)
 	if (err)
 		goto err_gt;
 
+	intel_migrate_init(&gt->migrate, gt);
+
 	goto out_fw;
 err_gt:
 	__intel_gt_disable(gt);
@@ -649,6 +652,7 @@ void intel_gt_driver_remove(struct intel_gt *gt)
 {
 	__intel_gt_disable(gt);
 
+	intel_migrate_fini(&gt->migrate);
 	intel_uc_driver_remove(&gt->uc);
 
 	intel_engines_release(gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index fecfacf551d5..7450935f2ca8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -24,6 +24,7 @@
 #include "intel_reset_types.h"
 #include "intel_rc6_types.h"
 #include "intel_rps_types.h"
+#include "intel_migrate_types.h"
 #include "intel_wakeref.h"
 
 struct drm_i915_private;
@@ -145,6 +146,8 @@ struct intel_gt {
 
 	struct i915_vma *scratch;
 
+	struct intel_migrate migrate;
+
 	struct intel_gt_info {
 		intel_engine_mask_t engine_mask;
 		u8 num_engines;
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index 9b8178a79ad3..a7d196a6f3eb 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -416,10 +416,9 @@ intel_context_migrate_copy(struct intel_context *ce,
 	struct i915_request *rq;
 	int err;
 
+	GEM_BUG_ON(ce->vm != ce->engine->gt->migrate.context->vm);
 	*out = NULL;
 
-	/* GEM_BUG_ON(ce->vm != migrate_vm); */
-
 	GEM_BUG_ON(ce->ring->size < SZ_64K);
 
 	do {
@@ -534,6 +533,7 @@ intel_context_migrate_clear(struct intel_context *ce,
 	struct i915_request *rq;
 	int err;
 
+	GEM_BUG_ON(ce->vm != ce->engine->gt->migrate.context->vm);
 	*out = NULL;
 
 	GEM_BUG_ON(ce->ring->size < SZ_64K);
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
index 159c8656e1b0..396c81364399 100644
--- a/drivers/gpu/drm/i915/gt/selftest_migrate.c
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -3,6 +3,8 @@
  * Copyright © 2020 Intel Corporation
  */
 
+#include <linux/sort.h>
+
 #include "selftests/i915_random.h"
 
 static const unsigned int sizes[] = {
@@ -441,14 +443,229 @@ int intel_migrate_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(thread_global_copy),
 		SUBTEST(thread_global_clear),
 	};
-	struct intel_migrate m;
+	struct intel_gt *gt = &i915->gt;
+
+	if (!gt->migrate.context)
+		return 0;
+
+	return i915_subtests(tests, &gt->migrate);
+}
+
+static struct drm_i915_gem_object *
+create_init_lmem_internal(struct intel_gt *gt, size_t sz, bool try_lmem)
+{
+	struct drm_i915_gem_object *obj = NULL;
 	int err;
 
-	if (intel_migrate_init(&m, &i915->gt))
+	if (try_lmem && HAS_LMEM(gt->i915))
+		obj = i915_gem_object_create_lmem(gt->i915, sz, 0);
+
+	if (IS_ERR_OR_NULL(obj)) {
+		obj = i915_gem_object_create_internal(gt->i915, sz);
+		if (IS_ERR(obj))
+			return obj;
+	}
+
+	i915_gem_object_trylock(obj);
+	err = i915_gem_object_pin_pages(obj);
+	if (err) {
+		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
+		return ERR_PTR(err);
+	}
+
+	return obj;
+}
+
+static int wrap_ktime_compare(const void *A, const void *B)
+{
+	const ktime_t *a = A, *b = B;
+
+	return ktime_compare(*a, *b);
+}
+
+static int __perf_clear_blt(struct intel_context *ce,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    size_t sz)
+{
+	ktime_t t[5];
+	int pass;
+	int err = 0;
+
+	for (pass = 0; pass < ARRAY_SIZE(t); pass++) {
+		struct i915_request *rq;
+		ktime_t t0, t1;
+
+		t0 = ktime_get();
+
+		err = intel_context_migrate_clear(ce, NULL, sg, cache_level,
+						  is_lmem, 0, &rq);
+		if (rq) {
+			if (i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT) < 0)
+				err = -EIO;
+			i915_request_put(rq);
+		}
+		if (err)
+			break;
+
+		t1 = ktime_get();
+		t[pass] = ktime_sub(t1, t0);
+	}
+	if (err)
+		return err;
+
+	sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+	pr_info("%s: %zd KiB fill: %lld MiB/s\n",
+		ce->engine->name, sz >> 10,
+		div64_u64(mul_u32_u32(4 * sz,
+				      1000 * 1000 * 1000),
+			  t[1] + 2 * t[2] + t[3]) >> 20);
+	return 0;
+}
+
+static int perf_clear_blt(void *arg)
+{
+	struct intel_gt *gt = arg;
+	static const unsigned long sizes[] = {
+		SZ_4K,
+		SZ_64K,
+		SZ_2M,
+		SZ_64M
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		struct drm_i915_gem_object *dst;
+		int err;
+
+		dst = create_init_lmem_internal(gt, sizes[i], true);
+		if (IS_ERR(dst))
+			return PTR_ERR(dst);
+
+		err = __perf_clear_blt(gt->migrate.context,
+				       dst->mm.pages->sgl,
+				       I915_CACHE_NONE,
+				       i915_gem_object_is_lmem(dst),
+				       sizes[i]);
+
+		i915_gem_object_unlock(dst);
+		i915_gem_object_put(dst);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int __perf_copy_blt(struct intel_context *ce,
+			   struct scatterlist *src,
+			   enum i915_cache_level src_cache_level,
+			   bool src_is_lmem,
+			   struct scatterlist *dst,
+			   enum i915_cache_level dst_cache_level,
+			   bool dst_is_lmem,
+			   size_t sz)
+{
+	ktime_t t[5];
+	int pass;
+	int err = 0;
+
+	for (pass = 0; pass < ARRAY_SIZE(t); pass++) {
+		struct i915_request *rq;
+		ktime_t t0, t1;
+
+		t0 = ktime_get();
+
+		err = intel_context_migrate_copy(ce, NULL,
+						 src, src_cache_level,
+						 src_is_lmem,
+						 dst, dst_cache_level,
+						 dst_is_lmem,
+						 &rq);
+		if (rq) {
+			if (i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT) < 0)
+				err = -EIO;
+			i915_request_put(rq);
+		}
+		if (err)
+			break;
+
+		t1 = ktime_get();
+		t[pass] = ktime_sub(t1, t0);
+	}
+	if (err)
+		return err;
+
+	sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+	pr_info("%s: %zd KiB copy: %lld MiB/s\n",
+		ce->engine->name, sz >> 10,
+		div64_u64(mul_u32_u32(4 * sz,
+				      1000 * 1000 * 1000),
+			  t[1] + 2 * t[2] + t[3]) >> 20);
+	return 0;
+}
+
+static int perf_copy_blt(void *arg)
+{
+	struct intel_gt *gt = arg;
+	static const unsigned long sizes[] = {
+		SZ_4K,
+		SZ_64K,
+		SZ_2M,
+		SZ_64M
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		struct drm_i915_gem_object *src, *dst;
+		int err;
+
+		src = create_init_lmem_internal(gt, sizes[i], true);
+		if (IS_ERR(src))
+			return PTR_ERR(src);
+
+		dst = create_init_lmem_internal(gt, sizes[i], false);
+		if (IS_ERR(dst)) {
+			err = PTR_ERR(dst);
+			goto err_src;
+		}
+
+		err = __perf_copy_blt(gt->migrate.context,
+				      src->mm.pages->sgl,
+				      I915_CACHE_NONE,
+				      i915_gem_object_is_lmem(src),
+				      dst->mm.pages->sgl,
+				      I915_CACHE_NONE,
+				      i915_gem_object_is_lmem(dst),
+				      sizes[i]);
+
+		i915_gem_object_unlock(dst);
+		i915_gem_object_put(dst);
+err_src:
+		i915_gem_object_unlock(src);
+		i915_gem_object_put(src);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int intel_migrate_perf_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(perf_clear_blt),
+		SUBTEST(perf_copy_blt),
+	};
+	struct intel_gt *gt = &i915->gt;
+
+	if (intel_gt_is_wedged(gt))
 		return 0;
 
-	err = i915_subtests(tests, &m);
-	intel_migrate_fini(&m);
+	if (!gt->migrate.context)
+		return 0;
 
-	return err;
+	return intel_gt_live_subtests(tests, gt);
 }
diff --git a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
index c2389f8a257d..5077dc3c3b8c 100644
--- a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
@@ -17,5 +17,6 @@
  */
 selftest(engine_cs, intel_engine_cs_perf_selftests)
 selftest(request, i915_request_perf_selftests)
+selftest(migrate, intel_migrate_perf_selftests)
 selftest(blt, i915_gem_object_blt_perf_selftests)
 selftest(region, intel_memory_region_perf_selftests)
-- 
2.31.1

[Intel-gfx] [PATCH 9/9] drm/i915/gt: Setup a default migration context on the GT

[Thomas Hellström]

From: Chris Wilson <chris@chris-wilson.co.uk>

Set up a default migration context on the GT and use it from the
selftests.
Add a perf selftest and make sure we exercise LMEM if available.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.c            |   4 +
 drivers/gpu/drm/i915/gt/intel_gt_types.h      |   3 +
 drivers/gpu/drm/i915/gt/intel_migrate.c       |   4 +-
 drivers/gpu/drm/i915/gt/selftest_migrate.c    | 227 +++++++++++++++++-
 .../drm/i915/selftests/i915_perf_selftests.h  |   1 +
 5 files changed, 232 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 2161bf01ef8b..67ef057ae918 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -13,6 +13,7 @@
 #include "intel_gt_clock_utils.h"
 #include "intel_gt_pm.h"
 #include "intel_gt_requests.h"
+#include "intel_migrate.h"
 #include "intel_mocs.h"
 #include "intel_rc6.h"
 #include "intel_renderstate.h"
@@ -626,6 +627,8 @@ int intel_gt_init(struct intel_gt *gt)
 	if (err)
 		goto err_gt;
 
+	intel_migrate_init(&gt->migrate, gt);
+
 	goto out_fw;
 err_gt:
 	__intel_gt_disable(gt);
@@ -649,6 +652,7 @@ void intel_gt_driver_remove(struct intel_gt *gt)
 {
 	__intel_gt_disable(gt);
 
+	intel_migrate_fini(&gt->migrate);
 	intel_uc_driver_remove(&gt->uc);
 
 	intel_engines_release(gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index fecfacf551d5..7450935f2ca8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -24,6 +24,7 @@
 #include "intel_reset_types.h"
 #include "intel_rc6_types.h"
 #include "intel_rps_types.h"
+#include "intel_migrate_types.h"
 #include "intel_wakeref.h"
 
 struct drm_i915_private;
@@ -145,6 +146,8 @@ struct intel_gt {
 
 	struct i915_vma *scratch;
 
+	struct intel_migrate migrate;
+
 	struct intel_gt_info {
 		intel_engine_mask_t engine_mask;
 		u8 num_engines;
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index 9b8178a79ad3..a7d196a6f3eb 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -416,10 +416,9 @@ intel_context_migrate_copy(struct intel_context *ce,
 	struct i915_request *rq;
 	int err;
 
+	GEM_BUG_ON(ce->vm != ce->engine->gt->migrate.context->vm);
 	*out = NULL;
 
-	/* GEM_BUG_ON(ce->vm != migrate_vm); */
-
 	GEM_BUG_ON(ce->ring->size < SZ_64K);
 
 	do {
@@ -534,6 +533,7 @@ intel_context_migrate_clear(struct intel_context *ce,
 	struct i915_request *rq;
 	int err;
 
+	GEM_BUG_ON(ce->vm != ce->engine->gt->migrate.context->vm);
 	*out = NULL;
 
 	GEM_BUG_ON(ce->ring->size < SZ_64K);
diff --git a/drivers/gpu/drm/i915/gt/selftest_migrate.c b/drivers/gpu/drm/i915/gt/selftest_migrate.c
index 159c8656e1b0..396c81364399 100644
--- a/drivers/gpu/drm/i915/gt/selftest_migrate.c
+++ b/drivers/gpu/drm/i915/gt/selftest_migrate.c
@@ -3,6 +3,8 @@
  * Copyright © 2020 Intel Corporation
  */
 
+#include <linux/sort.h>
+
 #include "selftests/i915_random.h"
 
 static const unsigned int sizes[] = {
@@ -441,14 +443,229 @@ int intel_migrate_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(thread_global_copy),
 		SUBTEST(thread_global_clear),
 	};
-	struct intel_migrate m;
+	struct intel_gt *gt = &i915->gt;
+
+	if (!gt->migrate.context)
+		return 0;
+
+	return i915_subtests(tests, &gt->migrate);
+}
+
+static struct drm_i915_gem_object *
+create_init_lmem_internal(struct intel_gt *gt, size_t sz, bool try_lmem)
+{
+	struct drm_i915_gem_object *obj = NULL;
 	int err;
 
-	if (intel_migrate_init(&m, &i915->gt))
+	if (try_lmem && HAS_LMEM(gt->i915))
+		obj = i915_gem_object_create_lmem(gt->i915, sz, 0);
+
+	if (IS_ERR_OR_NULL(obj)) {
+		obj = i915_gem_object_create_internal(gt->i915, sz);
+		if (IS_ERR(obj))
+			return obj;
+	}
+
+	i915_gem_object_trylock(obj);
+	err = i915_gem_object_pin_pages(obj);
+	if (err) {
+		i915_gem_object_unlock(obj);
+		i915_gem_object_put(obj);
+		return ERR_PTR(err);
+	}
+
+	return obj;
+}
+
+static int wrap_ktime_compare(const void *A, const void *B)
+{
+	const ktime_t *a = A, *b = B;
+
+	return ktime_compare(*a, *b);
+}
+
+static int __perf_clear_blt(struct intel_context *ce,
+			    struct scatterlist *sg,
+			    enum i915_cache_level cache_level,
+			    bool is_lmem,
+			    size_t sz)
+{
+	ktime_t t[5];
+	int pass;
+	int err = 0;
+
+	for (pass = 0; pass < ARRAY_SIZE(t); pass++) {
+		struct i915_request *rq;
+		ktime_t t0, t1;
+
+		t0 = ktime_get();
+
+		err = intel_context_migrate_clear(ce, NULL, sg, cache_level,
+						  is_lmem, 0, &rq);
+		if (rq) {
+			if (i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT) < 0)
+				err = -EIO;
+			i915_request_put(rq);
+		}
+		if (err)
+			break;
+
+		t1 = ktime_get();
+		t[pass] = ktime_sub(t1, t0);
+	}
+	if (err)
+		return err;
+
+	sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+	pr_info("%s: %zd KiB fill: %lld MiB/s\n",
+		ce->engine->name, sz >> 10,
+		div64_u64(mul_u32_u32(4 * sz,
+				      1000 * 1000 * 1000),
+			  t[1] + 2 * t[2] + t[3]) >> 20);
+	return 0;
+}
+
+static int perf_clear_blt(void *arg)
+{
+	struct intel_gt *gt = arg;
+	static const unsigned long sizes[] = {
+		SZ_4K,
+		SZ_64K,
+		SZ_2M,
+		SZ_64M
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		struct drm_i915_gem_object *dst;
+		int err;
+
+		dst = create_init_lmem_internal(gt, sizes[i], true);
+		if (IS_ERR(dst))
+			return PTR_ERR(dst);
+
+		err = __perf_clear_blt(gt->migrate.context,
+				       dst->mm.pages->sgl,
+				       I915_CACHE_NONE,
+				       i915_gem_object_is_lmem(dst),
+				       sizes[i]);
+
+		i915_gem_object_unlock(dst);
+		i915_gem_object_put(dst);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int __perf_copy_blt(struct intel_context *ce,
+			   struct scatterlist *src,
+			   enum i915_cache_level src_cache_level,
+			   bool src_is_lmem,
+			   struct scatterlist *dst,
+			   enum i915_cache_level dst_cache_level,
+			   bool dst_is_lmem,
+			   size_t sz)
+{
+	ktime_t t[5];
+	int pass;
+	int err = 0;
+
+	for (pass = 0; pass < ARRAY_SIZE(t); pass++) {
+		struct i915_request *rq;
+		ktime_t t0, t1;
+
+		t0 = ktime_get();
+
+		err = intel_context_migrate_copy(ce, NULL,
+						 src, src_cache_level,
+						 src_is_lmem,
+						 dst, dst_cache_level,
+						 dst_is_lmem,
+						 &rq);
+		if (rq) {
+			if (i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT) < 0)
+				err = -EIO;
+			i915_request_put(rq);
+		}
+		if (err)
+			break;
+
+		t1 = ktime_get();
+		t[pass] = ktime_sub(t1, t0);
+	}
+	if (err)
+		return err;
+
+	sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+	pr_info("%s: %zd KiB copy: %lld MiB/s\n",
+		ce->engine->name, sz >> 10,
+		div64_u64(mul_u32_u32(4 * sz,
+				      1000 * 1000 * 1000),
+			  t[1] + 2 * t[2] + t[3]) >> 20);
+	return 0;
+}
+
+static int perf_copy_blt(void *arg)
+{
+	struct intel_gt *gt = arg;
+	static const unsigned long sizes[] = {
+		SZ_4K,
+		SZ_64K,
+		SZ_2M,
+		SZ_64M
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sizes); i++) {
+		struct drm_i915_gem_object *src, *dst;
+		int err;
+
+		src = create_init_lmem_internal(gt, sizes[i], true);
+		if (IS_ERR(src))
+			return PTR_ERR(src);
+
+		dst = create_init_lmem_internal(gt, sizes[i], false);
+		if (IS_ERR(dst)) {
+			err = PTR_ERR(dst);
+			goto err_src;
+		}
+
+		err = __perf_copy_blt(gt->migrate.context,
+				      src->mm.pages->sgl,
+				      I915_CACHE_NONE,
+				      i915_gem_object_is_lmem(src),
+				      dst->mm.pages->sgl,
+				      I915_CACHE_NONE,
+				      i915_gem_object_is_lmem(dst),
+				      sizes[i]);
+
+		i915_gem_object_unlock(dst);
+		i915_gem_object_put(dst);
+err_src:
+		i915_gem_object_unlock(src);
+		i915_gem_object_put(src);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int intel_migrate_perf_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(perf_clear_blt),
+		SUBTEST(perf_copy_blt),
+	};
+	struct intel_gt *gt = &i915->gt;
+
+	if (intel_gt_is_wedged(gt))
 		return 0;
 
-	err = i915_subtests(tests, &m);
-	intel_migrate_fini(&m);
+	if (!gt->migrate.context)
+		return 0;
 
-	return err;
+	return intel_gt_live_subtests(tests, gt);
 }
diff --git a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
index c2389f8a257d..5077dc3c3b8c 100644
--- a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
@@ -17,5 +17,6 @@
  */
 selftest(engine_cs, intel_engine_cs_perf_selftests)
 selftest(request, i915_request_perf_selftests)
+selftest(migrate, intel_migrate_perf_selftests)
 selftest(blt, i915_gem_object_blt_perf_selftests)
 selftest(region, intel_memory_region_perf_selftests)
-- 
2.31.1

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[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Prereqs for TTM accelerated migration

[Patchwork]

== Series Details ==

Series: Prereqs for TTM accelerated migration
URL   : https://patchwork.freedesktop.org/series/91155/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
2242ed7d4819 drm/i915: Reference objects on the ww object list
80e16d0ed0bd drm/i915: Break out dma_resv ww locking utilities to separate files
-:140: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#140: 
new file mode 100644

-:165: WARNING:LONG_LINE: line length of 103 exceeds 100 columns
#165: FILE: drivers/gpu/drm/i915/i915_gem_ww.c:21:
+	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {

total: 0 errors, 2 warnings, 0 checks, 183 lines checked
593821a10769 drm/i915: Introduce a ww transaction helper
-:55: CHECK:MACRO_ARG_REUSE: Macro argument reuse '_ww' - possible side-effects?
#55: FILE: drivers/gpu/drm/i915/i915_gem_ww.h:46:
+#define for_i915_gem_ww(_ww, _err, _intr)			\
+	for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;	\
+	     _err = __i915_gem_ww_fini(_ww, _err))

-:55: CHECK:MACRO_ARG_REUSE: Macro argument reuse '_err' - possible side-effects?
#55: FILE: drivers/gpu/drm/i915/i915_gem_ww.h:46:
+#define for_i915_gem_ww(_ww, _err, _intr)			\
+	for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop;	\
+	     _err = __i915_gem_ww_fini(_ww, _err))

total: 0 errors, 0 warnings, 2 checks, 41 lines checked
c7566defcd7c drm/i915/gt: Add an insert_entry for gen8_ppgtt
26a16841f182 drm/i915/gt: Add a routine to iterate over the pagetables of a GTT
8e6cf3a8e8b3 drm/i915/gt: Export the pinned context constructor
8bd34da39144 drm/i915/gt: Pipelined page migration
-:66: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#66: 
new file mode 100644

-:879: WARNING:LINE_SPACING: Missing a blank line after declarations
#879: FILE: drivers/gpu/drm/i915/gt/selftest_migrate.c:176:
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);

-:908: WARNING:LINE_SPACING: Missing a blank line after declarations
#908: FILE: drivers/gpu/drm/i915/gt/selftest_migrate.c:205:
+	struct threaded_migrate *thread;
+	I915_RND_STATE(prng);

-:933: WARNING:MSLEEP: msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.rst
#933: FILE: drivers/gpu/drm/i915/gt/selftest_migrate.c:230:
+	msleep(10); /* start all threads before we kthread_stop() */

total: 0 errors, 4 warnings, 0 checks, 932 lines checked
09387b6a62ee drm/i915/gt: Pipelined clear
-:353: WARNING:LINE_SPACING: Missing a blank line after declarations
#353: FILE: drivers/gpu/drm/i915/gt/selftest_migrate.c:311:
+	struct drm_i915_private *i915 = migrate->context->engine->i915;
+	I915_RND_STATE(prng);

total: 0 errors, 1 warnings, 0 checks, 378 lines checked
15bf0f5044d2 drm/i915/gt: Setup a default migration context on the GT


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[Intel-gfx] ✗ Fi.CI.BAT: failure for Prereqs for TTM accelerated migration

[Patchwork]

[-- Attachment #1.1: Type: text/plain, Size: 10469 bytes --]

== Series Details ==

Series: Prereqs for TTM accelerated migration
URL   : https://patchwork.freedesktop.org/series/91155/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_10190 -> Patchwork_20309
====================================================

Summary
-------

  **FAILURE**

  Serious unknown changes coming with Patchwork_20309 absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_20309, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/index.html

Possible new issues
-------------------

  Here are the unknown changes that may have been introduced in Patchwork_20309:

### IGT changes ###

#### Possible regressions ####

  * igt@core_hotunplug@unbind-rebind:
    - fi-bsw-nick:        [PASS][1] -> [DMESG-WARN][2]
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-bsw-nick/igt@core_hotunplug@unbind-rebind.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bsw-nick/igt@core_hotunplug@unbind-rebind.html

  * igt@i915_selftest@live@gt_heartbeat:
    - fi-kbl-soraka:      [PASS][3] -> [DMESG-FAIL][4]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-kbl-soraka/igt@i915_selftest@live@gt_heartbeat.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-kbl-soraka/igt@i915_selftest@live@gt_heartbeat.html

  * igt@i915_selftest@live@uncore:
    - fi-bsw-kefka:       [PASS][5] -> [DMESG-FAIL][6]
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-bsw-kefka/igt@i915_selftest@live@uncore.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bsw-kefka/igt@i915_selftest@live@uncore.html

  
New tests
---------

  New tests have been introduced between CI_DRM_10190 and Patchwork_20309:

### New IGT tests (1) ###

  * igt@i915_selftest@live@migrate:
    - Statuses : 2 dmesg-warn(s) 33 pass(s)
    - Exec time: [0.52, 7.75] s

  

Known issues
------------

  Here are the changes found in Patchwork_20309 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_huc_copy@huc-copy:
    - fi-bxt-dsi:         NOTRUN -> [SKIP][7] ([fdo#109271] / [i915#2190])
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@gem_huc_copy@huc-copy.html

  * igt@i915_selftest@live@execlists:
    - fi-bxt-dsi:         NOTRUN -> [DMESG-FAIL][8] ([i915#3462])
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@i915_selftest@live@execlists.html

  * {igt@i915_selftest@live@migrate} (NEW):
    - {fi-ehl-2}:         NOTRUN -> [DMESG-WARN][9] ([i915#1222])
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-ehl-2/igt@i915_selftest@live@migrate.html
    - {fi-jsl-1}:         NOTRUN -> [DMESG-WARN][10] ([i915#1222])
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-jsl-1/igt@i915_selftest@live@migrate.html

  * igt@kms_chamelium@common-hpd-after-suspend:
    - fi-bxt-dsi:         NOTRUN -> [SKIP][11] ([fdo#109271] / [fdo#111827]) +8 similar issues
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@kms_chamelium@common-hpd-after-suspend.html

  * igt@kms_force_connector_basic@force-load-detect:
    - fi-bxt-dsi:         NOTRUN -> [SKIP][12] ([fdo#109271]) +10 similar issues
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@kms_force_connector_basic@force-load-detect.html

  * igt@kms_pipe_crc_basic@compare-crc-sanitycheck-pipe-d:
    - fi-bxt-dsi:         NOTRUN -> [SKIP][13] ([fdo#109271] / [i915#533])
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@kms_pipe_crc_basic@compare-crc-sanitycheck-pipe-d.html

  * igt@runner@aborted:
    - fi-bxt-dsi:         NOTRUN -> [FAIL][14] ([i915#3363])
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bxt-dsi/igt@runner@aborted.html

  
#### Possible fixes ####

  * igt@i915_pm_rpm@module-reload:
    - fi-skl-6600u:       [FAIL][15] ([i915#579]) -> [PASS][16]
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-skl-6600u/igt@i915_pm_rpm@module-reload.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-skl-6600u/igt@i915_pm_rpm@module-reload.html
    - {fi-tgl-dsi}:       [DMESG-WARN][17] ([i915#1982] / [i915#2411]) -> [PASS][18]
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-tgl-dsi/igt@i915_pm_rpm@module-reload.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-tgl-dsi/igt@i915_pm_rpm@module-reload.html

  
#### Warnings ####

  * igt@i915_selftest@live@execlists:
    - fi-cml-s:           [DMESG-FAIL][19] ([i915#3462]) -> [INCOMPLETE][20] ([i915#3462])
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-cml-s/igt@i915_selftest@live@execlists.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-cml-s/igt@i915_selftest@live@execlists.html

  * igt@runner@aborted:
    - fi-cfl-8700k:       [FAIL][21] ([i915#2426] / [i915#3363]) -> [FAIL][22] ([i915#3363])
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-cfl-8700k/igt@runner@aborted.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-cfl-8700k/igt@runner@aborted.html
    - fi-bsw-nick:        [FAIL][23] ([fdo#109271] / [i915#1436]) -> [FAIL][24] ([i915#1602])
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-bsw-nick/igt@runner@aborted.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-bsw-nick/igt@runner@aborted.html
    - fi-kbl-r:           [FAIL][25] ([i915#1436] / [i915#3363]) -> [FAIL][26] ([i915#1436] / [i915#2426] / [i915#3363])
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-kbl-r/igt@runner@aborted.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-kbl-r/igt@runner@aborted.html
    - fi-kbl-soraka:      [FAIL][27] ([i915#1436] / [i915#2426] / [i915#3363]) -> [FAIL][28] ([i915#1436] / [i915#3363])
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-kbl-soraka/igt@runner@aborted.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-kbl-soraka/igt@runner@aborted.html
    - fi-kbl-7500u:       [FAIL][29] ([i915#1436] / [i915#2426] / [i915#3363]) -> [FAIL][30] ([i915#1436] / [i915#3363])
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-kbl-7500u/igt@runner@aborted.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-kbl-7500u/igt@runner@aborted.html
    - fi-kbl-guc:         [FAIL][31] ([i915#1436] / [i915#2426] / [i915#3363]) -> [FAIL][32] ([i915#1436] / [i915#3363])
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-kbl-guc/igt@runner@aborted.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-kbl-guc/igt@runner@aborted.html
    - fi-cfl-guc:         [FAIL][33] ([i915#3363]) -> [FAIL][34] ([i915#2426] / [i915#3363])
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10190/fi-cfl-guc/igt@runner@aborted.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/fi-cfl-guc/igt@runner@aborted.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#111827]: https://bugs.freedesktop.org/show_bug.cgi?id=111827
  [i915#1222]: https://gitlab.freedesktop.org/drm/intel/issues/1222
  [i915#1436]: https://gitlab.freedesktop.org/drm/intel/issues/1436
  [i915#1602]: https://gitlab.freedesktop.org/drm/intel/issues/1602
  [i915#1982]: https://gitlab.freedesktop.org/drm/intel/issues/1982
  [i915#2190]: https://gitlab.freedesktop.org/drm/intel/issues/2190
  [i915#2411]: https://gitlab.freedesktop.org/drm/intel/issues/2411
  [i915#2426]: https://gitlab.freedesktop.org/drm/intel/issues/2426
  [i915#2932]: https://gitlab.freedesktop.org/drm/intel/issues/2932
  [i915#2966]: https://gitlab.freedesktop.org/drm/intel/issues/2966
  [i915#3363]: https://gitlab.freedesktop.org/drm/intel/issues/3363
  [i915#3462]: https://gitlab.freedesktop.org/drm/intel/issues/3462
  [i915#533]: https://gitlab.freedesktop.org/drm/intel/issues/533
  [i915#579]: https://gitlab.freedesktop.org/drm/intel/issues/579


Participating hosts (45 -> 42)
------------------------------

  Additional (1): fi-bxt-dsi 
  Missing    (4): fi-ilk-m540 fi-bsw-cyan fi-bdw-samus fi-hsw-4200u 


Build changes
-------------

  * Linux: CI_DRM_10190 -> Patchwork_20309

  CI-20190529: 20190529
  CI_DRM_10190: 4503a3efad888d86c2a0c5db101bf2712f90928f @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_6100: 801309d0c245cbf8115c03978d0819f484b477c0 @ https://gitlab.freedesktop.org/drm/igt-gpu-tools.git
  Patchwork_20309: 15bf0f5044d29c1be817f05153b76a7b39db2eec @ git://anongit.freedesktop.org/gfx-ci/linux


== Kernel 32bit build ==

Warning: Kernel 32bit buildtest failed:
https://intel-gfx-ci.01.org/Patchwork_20309/build_32bit.log

  CALL    scripts/checksyscalls.sh
  CALL    scripts/atomic/check-atomics.sh
  CHK     include/generated/compile.h
Kernel: arch/x86/boot/bzImage is ready  (#1)
  MODPOST modules-only.symvers
ERROR: modpost: "__udivdi3" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "__divdi3" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
scripts/Makefile.modpost:150: recipe for target 'modules-only.symvers' failed
make[1]: *** [modules-only.symvers] Error 1
make[1]: *** Deleting file 'modules-only.symvers'
Makefile:1759: recipe for target 'modules' failed
make: *** [modules] Error 2


== Linux commits ==

15bf0f5044d2 drm/i915/gt: Setup a default migration context on the GT
09387b6a62ee drm/i915/gt: Pipelined clear
8bd34da39144 drm/i915/gt: Pipelined page migration
8e6cf3a8e8b3 drm/i915/gt: Export the pinned context constructor
26a16841f182 drm/i915/gt: Add a routine to iterate over the pagetables of a GTT
c7566defcd7c drm/i915/gt: Add an insert_entry for gen8_ppgtt
593821a10769 drm/i915: Introduce a ww transaction helper
80e16d0ed0bd drm/i915: Break out dma_resv ww locking utilities to separate files
2242ed7d4819 drm/i915: Reference objects on the ww object list

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/index.html

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[Intel-gfx] ✗ Fi.CI.BUILD: warning for Prereqs for TTM accelerated migration

[Patchwork]

== Series Details ==

Series: Prereqs for TTM accelerated migration
URL   : https://patchwork.freedesktop.org/series/91155/
State : warning

== Summary ==

CALL    scripts/checksyscalls.sh
  CALL    scripts/atomic/check-atomics.sh
  CHK     include/generated/compile.h
Kernel: arch/x86/boot/bzImage is ready  (#1)
  MODPOST modules-only.symvers
ERROR: modpost: "__udivdi3" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "__divdi3" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
scripts/Makefile.modpost:150: recipe for target 'modules-only.symvers' failed
make[1]: *** [modules-only.symvers] Error 1
make[1]: *** Deleting file 'modules-only.symvers'
Makefile:1759: recipe for target 'modules' failed
make: *** [modules] Error 2

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20309/build_32bit.log
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