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 v4: - fix builds with CONFIG_TRANSPARENT_HUGEPAGE=n - clean up mountpoint creation error handling - print negative error value Signed-off-by: Loïc Molinari <[email protected]> Reviewed-by: Boris Brezillon <[email protected]> --- 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 607a5b8448d0..dfeb6a633fa1 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -858,6 +858,12 @@ 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..9b059a8b0f9f 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 <[email protected]> */ +/* 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) +{ +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + int err; + + if (!panfrost_transparent_hugepage) + return; + + err = drm_gem_huge_mnt_create(pfdev->ddev, "within_size"); + if (pfdev->ddev->huge_mnt) + drm_info(pfdev->ddev, "Using Transparent Hugepage\n"); + else if (err) + drm_warn(pfdev->ddev, "Can't use Transparent Hugepage (%d)\n", + err); +#endif +} + #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
