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Message-ID: <20251004093054.21388-10-loic.molinari@collabora.com>
Date: Sat, 4 Oct 2025 11:30:52 +0200
From: Loïc Molinari <loic.molinari@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tursulin@...ulin.net>,
Boris Brezillon <boris.brezillon@...labora.com>,
Rob Herring <robh@...nel.org>,
Steven Price <steven.price@....com>,
Liviu Dudau <liviu.dudau@....com>,
Melissa Wen <mwen@...lia.com>,
Maíra Canal <mcanal@...lia.com>,
Hugh Dickins <hughd@...gle.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Loïc Molinari <loic.molinari@...labora.com>,
Al Viro <viro@...iv.linux.org.uk>,
Mikołaj Wasiak <mikolaj.wasiak@...el.com>,
Christian Brauner <brauner@...nel.org>,
Nitin Gote <nitin.r.gote@...el.com>,
Andi Shyti <andi.shyti@...ux.intel.com>,
Christopher Healy <healych@...zon.com>
Cc: linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org,
linux-mm@...ck.org,
kernel@...labora.com
Subject: [PATCH v3 09/10] drm/panfrost: Introduce huge tmpfs mount point option
Introduce the 'panfrost.transparent_hugepage' boolean module parameter
(false by default). When the parameter is set to true, a new tmpfs
mount point is created and mounted using the 'huge=within_size'
option. It's then used at GEM object creation instead of the default
'shm_mnt' mount point in order to enable Transparent Hugepage (THP)
for the object (without having to rely on a system wide parameter).
v3:
- use huge tmpfs mountpoint in drm_device
Signed-off-by: Loïc Molinari <loic.molinari@...labora.com>
---
drivers/gpu/drm/panfrost/panfrost_device.c | 3 +++
drivers/gpu/drm/panfrost/panfrost_drv.c | 6 ++++++
drivers/gpu/drm/panfrost/panfrost_drv.h | 11 +++++++++++
drivers/gpu/drm/panfrost/panfrost_gem.c | 19 +++++++++++++++++++
drivers/gpu/drm/panfrost/panfrost_gem.h | 2 ++
5 files changed, 41 insertions(+)
create mode 100644 drivers/gpu/drm/panfrost/panfrost_drv.h
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 04bec27449cb..a189bfaac959 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -12,6 +12,7 @@
#include "panfrost_device.h"
#include "panfrost_devfreq.h"
#include "panfrost_features.h"
+#include "panfrost_gem.h"
#include "panfrost_issues.h"
#include "panfrost_gpu.h"
#include "panfrost_job.h"
@@ -266,6 +267,8 @@ int panfrost_device_init(struct panfrost_device *pfdev)
if (err)
goto out_job;
+ panfrost_gem_init(pfdev);
+
return 0;
out_job:
panfrost_job_fini(pfdev);
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 22350ce8a08f..e376e70a3379 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -862,6 +862,12 @@ static const struct drm_driver panfrost_drm_driver = {
#endif
};
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+bool panfrost_transparent_hugepage;
+module_param_named(transparent_hugepage, panfrost_transparent_hugepage, bool, 0400);
+MODULE_PARM_DESC(transparent_hugepage, "Use a dedicated tmpfs mount point with Transparent Hugepage enabled (false = default)");
+#endif
+
static int panfrost_probe(struct platform_device *pdev)
{
struct panfrost_device *pfdev;
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.h b/drivers/gpu/drm/panfrost/panfrost_drv.h
new file mode 100644
index 000000000000..60454611b6a6
--- /dev/null
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+/* Copyright 2025 Amazon.com, Inc. or its affiliates */
+
+#ifndef __PANFROST_DRV_H__
+#define __PANFROST_DRV_H__
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern bool panfrost_transparent_hugepage;
+#endif
+
+#endif
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
index 85d6289a6eda..c3883a639e13 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@...nel.org> */
+/* Copyright 2025 Amazon.com, Inc. or its affiliates */
#include <linux/cleanup.h>
#include <linux/err.h>
@@ -9,9 +10,27 @@
#include <drm/panfrost_drm.h>
#include "panfrost_device.h"
+#include "panfrost_drv.h"
#include "panfrost_gem.h"
#include "panfrost_mmu.h"
+void panfrost_gem_init(struct panfrost_device *pfdev)
+{
+ int err;
+
+ if (!panfrost_transparent_hugepage)
+ return;
+
+ err = drm_gem_huge_mnt_create(pfdev->ddev, "within_size");
+ if (err && err != -EEXIST) {
+ drm_warn(pfdev->ddev, "Can't use Transparent Hugepage (%d)\n",
+ -err);
+ return;
+ }
+
+ drm_info(pfdev->ddev, "Using Transparent Hugepage\n");
+}
+
#ifdef CONFIG_DEBUG_FS
static void panfrost_gem_debugfs_bo_add(struct panfrost_device *pfdev,
struct panfrost_gem_object *bo)
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h
index 8de3e76f2717..1a62529ff06f 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.h
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
@@ -124,6 +124,8 @@ drm_mm_node_to_panfrost_mapping(struct drm_mm_node *node)
return container_of(node, struct panfrost_gem_mapping, mmnode);
}
+void panfrost_gem_init(struct panfrost_device *pfdev);
+
struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size);
struct drm_gem_object *
--
2.47.3
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