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Message-Id: <20230227060219.904986-3-dmitry.osipenko@collabora.com>
Date: Mon, 27 Feb 2023 09:02:11 +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>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: [PATCH v11 02/10] drm/shmem-helper: Add pages_pin_count field
And new pages_pin_count field to struct drm_gem_shmem_object that will
determine whether pages are evictable by memory shrinker. The pages will
be evictable only when pages_pin_count=0. This patch prepares code for
addition of the memory shrinker that will utilize the new field.
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 12 +++++++++++-
include/drm/drm_gem_shmem_helper.h | 9 +++++++++
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 49ab49454783..97b40676bdfa 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -280,12 +280,17 @@ EXPORT_SYMBOL(drm_gem_shmem_put_pages);
int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem)
{
struct drm_gem_object *obj = &shmem->base;
+ int ret;
dma_resv_assert_held(shmem->base.resv);
drm_WARN_ON(obj->dev, obj->import_attach);
- return drm_gem_shmem_get_pages(shmem);
+ ret = drm_gem_shmem_get_pages(shmem);
+ if (!ret)
+ shmem->pages_pin_count++;
+
+ return ret;
}
EXPORT_SYMBOL(drm_gem_shmem_pin);
@@ -304,7 +309,12 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem)
drm_WARN_ON(obj->dev, obj->import_attach);
+ if (drm_WARN_ON_ONCE(obj->dev, !shmem->pages_pin_count))
+ return;
+
drm_gem_shmem_put_pages(shmem);
+
+ shmem->pages_pin_count--;
}
EXPORT_SYMBOL(drm_gem_shmem_unpin);
diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h
index 20ddcd799df9..7d823c9fc480 100644
--- a/include/drm/drm_gem_shmem_helper.h
+++ b/include/drm/drm_gem_shmem_helper.h
@@ -39,6 +39,15 @@ struct drm_gem_shmem_object {
*/
unsigned int pages_use_count;
+ /**
+ * @pages_pin_count:
+ *
+ * Reference count on the pinned pages table.
+ * The pages allowed to be evicted by memory shrinker
+ * only when the count is zero.
+ */
+ unsigned int pages_pin_count;
+
/**
* @madv: State for madvise
*
--
2.39.2
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