linux-kernel - [PATCH v4 1/5] drm/ttm: add new api ttm_device_prepare

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250709064404.839975-2-guoqing.zhang@amd.com>
Date: Wed, 9 Jul 2025 14:44:00 +0800
From: Samuel Zhang <guoqing.zhang@....com>
To: <alexander.deucher@....com>, <christian.koenig@....com>,
	<rafael@...nel.org>, <len.brown@...el.com>, <pavel@...nel.org>,
	<gregkh@...uxfoundation.org>, <dakr@...nel.org>, <airlied@...il.com>,
	<simona@...ll.ch>, <ray.huang@....com>, <matthew.auld@...el.com>,
	<matthew.brost@...el.com>, <maarten.lankhorst@...ux.intel.com>,
	<mripard@...nel.org>, <tzimmermann@...e.de>
CC: <mario.limonciello@....com>, <lijo.lazar@....com>, <victor.zhao@....com>,
	<haijun.chang@....com>, <Qing.Ma@....com>, <Owen.Zhang2@....com>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>, "Samuel
 Zhang" <guoqing.zhang@....com>
Subject: [PATCH v4 1/5] drm/ttm: add new api ttm_device_prepare_hibernation()

This new api is used for hibernation to move GTT BOs to shmem after
VRAM eviction. shmem will be flushed to swap disk later to reduce
the system memory usage for hibernation.

Signed-off-by: Samuel Zhang <guoqing.zhang@....com>
---
 drivers/gpu/drm/ttm/ttm_device.c | 23 +++++++++++++++++++++++
 include/drm/ttm/ttm_device.h     |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 02e797fd1891..9c9ab1903919 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -123,6 +123,29 @@ static int ttm_global_init(void)
 	return ret;
 }
 
+/**
+ * ttm_device_prepare_hibernation - move GTT BOs to shmem for hibernation.
+ *
+ * @bdev: A pointer to a struct ttm_device to prepare hibernation for.
+ *
+ * Return: 0 on success, negative number on failure.
+ */
+int ttm_device_prepare_hibernation(struct ttm_device *bdev)
+{
+	struct ttm_operation_ctx ctx = {
+		.interruptible = false,
+		.no_wait_gpu = false,
+		.force_alloc = true
+	};
+	int ret;
+
+	do {
+		ret = ttm_device_swapout(bdev, &ctx, GFP_KERNEL);
+	} while (ret > 0);
+	return ret;
+}
+EXPORT_SYMBOL(ttm_device_prepare_hibernation);
+
 /*
  * A buffer object shrink method that tries to swap out the first
  * buffer object on the global::swap_lru list.
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index 39b8636b1845..592b5f802859 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -272,6 +272,7 @@ struct ttm_device {
 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags);
 int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
 		       gfp_t gfp_flags);
+int ttm_device_prepare_hibernation(struct ttm_device *bdev);
 
 static inline struct ttm_resource_manager *
 ttm_manager_type(struct ttm_device *bdev, int mem_type)
-- 
2.43.5