From: Thomas Hellström <thomas.hellstrom@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
---
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 | 59 ------------------
drivers/gpu/drm/i915/i915_gem.h | 12 ----
drivers/gpu/drm/i915/i915_gem_ww.c | 66 +++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_ww.h | 21 +++++++
7 files changed, 90 insertions(+), 71 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 5112e5d79316..ec361d61230b 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 60e27738c39d..c6c7ab181a65 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 2248e65cf5f9..2662d679db6e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1326,65 +1326,6 @@ 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);
- }
-}
-
-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);
-
- /*
- * Unlocking the contended lock again, as might not need it in
- * the retried transaction. This does not increase starvation,
- * but it's opening up for a wakeup flood if there are many
- * transactions relaxing on this object.
- */
- if (!ret)
- dma_resv_unlock(ww->contended->base.resv);
-
- 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 a4cad3f154ca..f333e88a2b6e 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -116,16 +116,4 @@ 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..43960d8595eb
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_ww.c
@@ -0,0 +1,66 @@
+// 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);
+ }
+}
+
+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);
+
+ /*
+ * Unlocking the contended lock again, as might not need it in
+ * the retried transaction. This does not increase starvation,
+ * but it's opening up for a wakeup flood if there are many
+ * transactions relaxing on this object.
+ */
+ if (!ret)
+ dma_resv_unlock(ww->contended->base.resv);
+
+ 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
--
2.26.2
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