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(unknown [IPv6:2a01:e0a:5e3:6100:2e0:4cff:fe03:d8c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: loicmolinari) by bali.collaboradmins.com (Postfix) with ESMTPSA id AB0AC17E07EE; Sat, 4 Oct 2025 11:30:58 +0200 (CEST) From: =?UTF-8?q?Lo=C3=AFc=20Molinari?= To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Boris Brezillon , Rob Herring , Steven Price , Liviu Dudau , Melissa Wen , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Hugh Dickins , Baolin Wang , Andrew Morton , =?UTF-8?q?Lo=C3=AFc=20Molinari?= , Al Viro , =?UTF-8?q?Miko=C5=82aj=20Wasiak?= , Christian Brauner , Nitin Gote , Andi Shyti , Christopher Healy Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, kernel@collabora.com Subject: [PATCH v3 00/10] drm: Reduce page tables overhead with THP Date: Sat, 4 Oct 2025 11:30:43 +0200 Message-ID: <20251004093054.21388-1-loic.molinari@collabora.com> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This series aims to reduce the page tables overhead of DRM drivers for builds with CONFIG_TRANSPARENT_HUGEPAGE enabled and either the sysfs knob '/sys/kernel/mm/transparent_hugepage/shmem_enabled' appropriately set or drivers using a dedicated huge tmpfs mount point. It starts by adding a huge page fault handler for GEM objects to insert PMD or PUD mappings whenever the shmem backing store manages to create huge folios. It then introduces a dedicated get_unmapped_area file operation on the DRM file descriptor for GEM objects to get the best virtual address alignment for the underlying shmem buffers. The remaining commits propose shmem helpers to create and release huge tmpfs mount points and adapt the i915 and V3D drivers. The helpers are then used to optionally enable Transparent Hugepage for Panfrost and Panthor. For Panthor on a Rock 5B, this series makes the first memcpy() to an entire BO object mapped in userspace about twice as fast with Transparent Hugepage enabled. Loïc Molinari (10): drm/shmem-helper: Add huge page fault handler drm/gem: Introduce drm_gem_get_unmapped_area() fop drm/gem: Add huge tmpfs mount point helper drm/i915: Use huge tmpfs mount point helper drm/v3d: Use huge tmpfs mount point helper drm/gem: Get rid of *_with_mnt helpers drm/panthor: Introduce huge tmpfs mount point option drm/panthor: Improve IOMMU map/unmap debugging logs drm/panfrost: Introduce huge tmpfs mount point option Documentation/gpu/drm-mm: Add THP paragraph to GEM mapping section Documentation/gpu/drm-mm.rst | 17 +- drivers/gpu/drm/drm_gem.c | 208 ++++++++++++++---- drivers/gpu/drm/drm_gem_shmem_helper.c | 94 +++++--- drivers/gpu/drm/i915/Makefile | 3 +- drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 52 +++-- drivers/gpu/drm/i915/gem/i915_gemfs.c | 74 ------- drivers/gpu/drm/i915/gem/i915_gemfs.h | 14 -- .../gpu/drm/i915/gem/selftests/huge_pages.c | 10 +- drivers/gpu/drm/i915/i915_drv.h | 5 - 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 + drivers/gpu/drm/panthor/panthor_device.c | 3 + drivers/gpu/drm/panthor/panthor_drv.c | 7 + drivers/gpu/drm/panthor/panthor_drv.h | 11 + drivers/gpu/drm/panthor/panthor_gem.c | 19 ++ drivers/gpu/drm/panthor/panthor_gem.h | 2 + drivers/gpu/drm/panthor/panthor_mmu.c | 19 +- drivers/gpu/drm/v3d/Makefile | 3 +- drivers/gpu/drm/v3d/v3d_bo.c | 6 +- drivers/gpu/drm/v3d/v3d_drv.c | 2 +- drivers/gpu/drm/v3d/v3d_drv.h | 11 +- drivers/gpu/drm/v3d/v3d_gem.c | 33 ++- drivers/gpu/drm/v3d/v3d_gemfs.c | 65 ------ include/drm/drm_device.h | 11 + include/drm/drm_gem.h | 8 +- include/drm/drm_gem_shmem_helper.h | 3 - mm/shmem.c | 1 + 30 files changed, 431 insertions(+), 291 deletions(-) delete mode 100644 drivers/gpu/drm/i915/gem/i915_gemfs.c delete mode 100644 drivers/gpu/drm/i915/gem/i915_gemfs.h create mode 100644 drivers/gpu/drm/panfrost/panfrost_drv.h create mode 100644 drivers/gpu/drm/panthor/panthor_drv.h delete mode 100644 drivers/gpu/drm/v3d/v3d_gemfs.c -- 2.47.3