[PATCH v8 00/15] Prefetch Support for svm ranges

[Himal Prasad Ghimiray]

This series builds upon the SVM work by Matt Brost and introduces the
ability to prefetch SVM ranges. The prefetch functionality utilizes the
existing ioctl vm_bind for the user interface.

Prefetching ensures that pages are populated in the requested region and
that PTEs are updated, thereby preventing GPU page faults.

Region 0: Ranges will remain in SMEM, and only PTE updates will occur.
Region 1: Ranges will migrate to VRAM, and PTEs will be updated
accordingly

v3:
  - Separate out madvise and Prefetch series
  - Rebase on top of atomic fixes for svm
  - address comments from Matthew Brost

v4:
  - CI fixes

v5
  - Move finding start addr of cpu vma to drm gpusvm layer

v6
  - Rebase on top of latest SVM ATOMIC Fixes
  - move eviction logic to prefetch_ranges
  - Rename functions properly

v7
 - Rebase on top of v8 of SVM ATOMIC Fixes
 - devmem_only assigned 0 for prefetch
 - s/mmget/mmget_not_zero/

v8
 - Rebase
 - s/struct drm_gpusvm_ctx ctx;/struct drm_gpusvm_ctx ctx = {};

Himal Prasad Ghimiray (16):
  drm/gpusvm: Introduce devmem_only flag for allocation
  drm/xe: Introduce xe_vma_op_prefetch_range struct for prefetch of
    ranges
  drm/xe: Make xe_svm_alloc_vram public
  drm/xe/svm: Helper to add tile masks to svm ranges
  drm/xe/svm: Make to_xe_range a public function
  drm/xe/svm: Make xe_svm_range_* end/start/size public
  drm/xe/vm: Update xe_vma_ops_incr_pt_update_ops to take an increment
    value
  drm/xe/vm: Add an identifier in xe_vma_ops for svm prefetch
  drm/xe: Rename lookup_vma function to xe_find_vma_by_addr
  drm/xe/svm: Refactor usage of drm_gpusvm* function in xe_svm
  drm/xe/svm: Make xe_svm_range_needs_migrate_to_vram() public
  drm/xe/svm: Add xe_svm_range_validate() and
    xe_svm_range_migrate_to_smem()
  drm/gpusvm: Introduce drm_gpusvm_find_vma_start() function
  drm/xe/svm: Add xe_svm_find_vma_start() helper
  drm/xe/svm: Implement prefetch support for SVM ranges
  drm/xe/vm: Add debug prints for SVM range prefetch

 drivers/gpu/drm/drm_gpusvm.c         |  34 ++++
 drivers/gpu/drm/xe/xe_gt_pagefault.c |  24 +--
 drivers/gpu/drm/xe/xe_pt.c           |  84 ++++++---
 drivers/gpu/drm/xe/xe_svm.c          | 204 ++++++++++++++++-----
 drivers/gpu/drm/xe/xe_svm.h          | 138 ++++++++++++++
 drivers/gpu/drm/xe/xe_vm.c           | 259 +++++++++++++++++++++++++--
 drivers/gpu/drm/xe/xe_vm.h           |   2 +
 drivers/gpu/drm/xe/xe_vm_types.h     |  15 ++
 include/drm/drm_gpusvm.h             |   5 +
 9 files changed, 653 insertions(+), 112 deletions(-)

-- 
2.34.1