[PATCH v2 0/4] drm/amdkfd: Enable device private memory THP support in kfd svm driver

[Xiaogang.Chen <xiaogang.chen@amd.com>]

From: Xiaogang Chen <xiaogang.chen@amd.com>

Use following work of device-private THP support [1] in kfd driver to add
2MB/THP support in migration. The implementation enables efficient migration
of large folios between system memory and device-private memory.

[1]https://lore.kernel.org/linux-mm/20251001065707.920170-1-balbirs@nvidia.com/

v2:
- Reset is_large each 4K page iteration
- Unmap the THP DMA mapping once as DMA mapping, at its real size
- Leave migrate->dst[i] zero when the source is not migrating
- Count THP migrations as HPAGE_PMD_NR pages in prange->vram_pages
- Implement folio_split and hold one svm_bo ref per subpage

Xiaogang Chen (4):
  drm/amdkfd: Add awareness of THP of device and system RAM in kfd svm
    driver
  drm/amdkfd: Change migration size in CPU/GPU page fault handler to THP
    size
  drm/amdkfd: Apply HMM THP zone device-private memory migration in kfd
    driver
  drm/amdkfd: Apply AMDGPU_PTE_FRAG to pte of gart page table for THP
    mapping

 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 348 ++++++++++++++++++-----
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c     |  28 +-
 drivers/gpu/drm/amd/amdkfd/kfd_svm.h     |  13 +
 3 files changed, 315 insertions(+), 74 deletions(-)

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2.34.1