drm/i915: Break out dma_resv ww locking utilities to separate files

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>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210617063018.92802-3-thomas.hellstrom@linux.intel.com

drivers/gpu/drm/i915/Makefile

@@ -166,6 +166,7 @@ i915-y += \
 	  i915_cmd_parser.o \
 	  i915_gem_evict.o \
 	  i915_gem_gtt.o \
+	  i915_gem_ww.o \
 	  i915_gem.o \
 	  i915_globals.o \
 	  i915_query.o \

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -14,6 +14,7 @@
 #include "display/intel_frontbuffer.h"
 #include "i915_gem_object_types.h"
 #include "i915_gem_gtt.h"
+#include "i915_gem_ww.h"
 #include "i915_vma_types.h"
 
 /*

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;

drivers/gpu/drm/i915/i915_gem.c

@@ -1201,62 +1201,6 @@ 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"

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__ */

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;
+}

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