[RFC,1/2] drm/i915: Break out dma_resv ww locking utilities to separate files

Commit Message

Thomas Hellström (Intel) Sept. 17, 2020, 9:44 a.m. UTC

From: Thomas Hellström <[e-mail]>

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 <[e-mail]>
---
 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             | 64 ------------------
 drivers/gpu/drm/i915/i915_gem.h             | 15 -----
 drivers/gpu/drm/i915/i915_gem_ww.c          | 72 +++++++++++++++++++++
 drivers/gpu/drm/i915/i915_gem_ww.h          | 23 +++++++
 7 files changed, 98 insertions(+), 79 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c
 create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h

Patch

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 58d129b5a65a..71503bc26d98 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 f084a25c5121..cd64b1fdf53c 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"
 
 void i915_gem_init__objects(struct drm_i915_private *i915);
 
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h
index 713aa1e86c80..d9db833b873b 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.h
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h
@@ -26,6 +26,7 @@ 
 
 #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 3f83ac729644..fa1b7861b954 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1365,70 +1365,6 @@  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))) {
-		if (WARN_ON(!kref_read(&obj->base.refcount))) {
-			unsigned long *entries;
-			unsigned int nr_entries;
-
-			nr_entries = stack_depot_fetch(obj->bt, &entries);
-			stack_trace_print(entries, nr_entries, 4);
-		}
-
-		obj->bt = 0;
-		list_del(&obj->obj_link);
-		i915_gem_object_unlock(obj);
-	}
-}
-
-void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
-{
-	list_del(&obj->obj_link);
-	i915_gem_object_unlock(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);
-		ww->contended->bt = ww->contended_bt;
-	}
-
-	ww->contended = NULL;
-	ww->contended_bt = 0;
-
-	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 4d50afab43f2..db0b2835095d 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -27,8 +27,6 @@ 
 
 #include <linux/bug.h>
 #include <linux/interrupt.h>
-#include <linux/stackdepot.h>
-#include <linux/stacktrace.h>
 #include <drm/drm_drv.h>
 
 #include "i915_utils.h"
@@ -117,17 +115,4 @@  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;
-	depot_stack_handle_t contended_bt;
-};
-
-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..3490b72cf613
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.c
@@ -0,0 +1,72 @@ 
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#include <linux/dma-resv.h>
+#include <linux/stacktrace.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))) {
+		if (WARN_ON(!kref_read(&obj->base.refcount))) {
+			unsigned long *entries;
+			unsigned int nr_entries;
+
+			nr_entries = stack_depot_fetch(obj->bt, &entries);
+			stack_trace_print(entries, nr_entries, 4);
+		}
+
+		obj->bt = 0;
+		list_del(&obj->obj_link);
+		i915_gem_object_unlock(obj);
+	}
+}
+
+void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
+{
+	list_del(&obj->obj_link);
+	i915_gem_object_unlock(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);
+		ww->contended->bt = ww->contended_bt;
+	}
+
+	ww->contended = NULL;
+	ww->contended_bt = 0;
+
+	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..94fdf8c5f89b
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.h
@@ -0,0 +1,23 @@ 
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+#ifndef __I915_GEM_WW_H__
+#define __I915_GEM_WW_H__
+
+#include <linux/stackdepot.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;
+	depot_stack_handle_t contended_bt;
+	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