linux-kernel - [PATCH v10 03/11] drm/gem: Add evict() callback to drm_gem_object

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Message-Id: <20230108210445.3948344-4-dmitry.osipenko@collabora.com>
Date:   Mon,  9 Jan 2023 00:04:37 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     David Airlie <airlied@...il.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Clark <robdclark@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh@...nel.org>, Sean Paul <sean@...rly.run>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: [PATCH v10 03/11] drm/gem: Add evict() callback to drm_gem_object_funcs

Add new common evict() callback to drm_gem_object_funcs and corresponding
drm_gem_object_evict() helper. This is a first step on a way to providing
common GEM-shrinker API for DRM drivers.

Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 drivers/gpu/drm/drm_gem.c | 16 ++++++++++++++++
 include/drm/drm_gem.h     | 12 ++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index c6bca5ac6e0f..dbb48fc9dff3 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1471,3 +1471,19 @@ drm_gem_lru_scan(struct drm_gem_lru *lru,
 	return freed;
 }
 EXPORT_SYMBOL(drm_gem_lru_scan);
+
+/**
+ * drm_gem_object_evict - helper to evict backing pages for a GEM object
+ * @obj: obj in question
+ */
+bool
+drm_gem_object_evict(struct drm_gem_object *obj)
+{
+	dma_resv_assert_held(obj->resv);
+
+	if (obj->funcs->evict)
+		return obj->funcs->evict(obj);
+
+	return false;
+}
+EXPORT_SYMBOL(drm_gem_object_evict);
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index f1f00fc2dba6..8e5c22f25691 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -172,6 +172,16 @@ struct drm_gem_object_funcs {
 	 * This is optional but necessary for mmap support.
 	 */
 	const struct vm_operations_struct *vm_ops;
+
+	/**
+	 * @evict:
+	 *
+	 * Evicts gem object out from memory. Used by the drm_gem_object_evict()
+	 * helper. Returns true on success, false otherwise.
+	 *
+	 * This callback is optional.
+	 */
+	bool (*evict)(struct drm_gem_object *obj);
 };
 
 /**
@@ -481,4 +491,6 @@ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru,
 			       unsigned long *remaining,
 			       bool (*shrink)(struct drm_gem_object *obj));
 
+bool drm_gem_object_evict(struct drm_gem_object *obj);
+
 #endif /* __DRM_GEM_H__ */
-- 
2.38.1