This series aims to reduce the page tables overhead of DRM drivers for builds with CONFIG_TRANSPARENT_HUGEPAGE enabled and either the sysfs config '/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. Loïc Molinari (8): drm/shmem-helper: Add huge page fault handler drm/gem: Introduce drm_gem_get_unmapped_area() fop drm/shmem-helper: Add huge tmpfs mount point helpers drm/i915: Use huge tmpfs mount point helpers drm/v3d: Use huge tmpfs mount point 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 drivers/gpu/drm/drm_gem.c | 110 ++++++++++++++++---- drivers/gpu/drm/drm_gem_shmem_helper.c | 112 ++++++++++++++++++++- drivers/gpu/drm/i915/gem/i915_gemfs.c | 33 +----- drivers/gpu/drm/panfrost/panfrost_device.c | 4 + drivers/gpu/drm/panfrost/panfrost_device.h | 2 + drivers/gpu/drm/panfrost/panfrost_drv.c | 6 ++ drivers/gpu/drm/panfrost/panfrost_drv.h | 11 ++ drivers/gpu/drm/panfrost/panfrost_gem.c | 29 +++++- drivers/gpu/drm/panfrost/panfrost_gem.h | 3 + drivers/gpu/drm/panthor/panthor_device.c | 4 + drivers/gpu/drm/panthor/panthor_device.h | 3 + drivers/gpu/drm/panthor/panthor_drv.c | 7 ++ drivers/gpu/drm/panthor/panthor_drv.h | 11 ++ drivers/gpu/drm/panthor/panthor_gem.c | 30 +++++- drivers/gpu/drm/panthor/panthor_gem.h | 3 + drivers/gpu/drm/panthor/panthor_mmu.c | 19 +++- drivers/gpu/drm/v3d/v3d_gemfs.c | 31 +----- include/drm/drm_gem.h | 4 + include/drm/drm_gem_shmem_helper.h | 14 +++ mm/shmem.c | 1 + 20 files changed, 346 insertions(+), 91 deletions(-) create mode 100644 drivers/gpu/drm/panfrost/panfrost_drv.h create mode 100644 drivers/gpu/drm/panthor/panthor_drv.h -- 2.47.3
