[PATCH V14 0/9] Add memory page offlining support

This functionality represents a significant step in making
the xe driver gracefully handle hardware memory degradation.
By integrating with the DRM Buddy allocator, the driver
can permanently "carve out" faulty memory so it isn't reused
by subsequent allocations.

This series adds memory page offlining support with following:
1. Link VRAM object with gpu buddy
2. Link and track ttm BO's with physical addresses
3. Link LRC BO and its execution Queue
4. Extend BO purge to handle vram pages as well
5. Handle the generated physical address error by reserving addresses 4K page
6. Add configfs for vram bad page reservation policy
7. Sysfs entry to provide statistics of bad gpu vram pages for user info
8. Expose ban reason in EXEC_QUEUE_GET_PROPERTY_BAN
9. drm/xe: Add fault-inject based VRAM page offline injection

v14:
- Solve sashiko reviews
- Remove SOFT->HARD offline patch, decision is taken based on -EEXIST
- Dump gpu buddy allocated patch dropped
v13:
- Add fault inject and remove standlone debugfs
v12:
- Fix Sashiko review comments
v11:
- Add BAN reason for UMD to know about offlining
- Add support for soft offline mode
- Rebase and remove dummy lockdep annotation patch, as it merged from upstream
v10:
- Remove RFC
v7:
- Improve debugfs warning messages
- Use scope_guard for locking(MattB)
- Adapt addition of queue member of LRC BO(MattB)
- Extend and use xe_ttm_bo_purge API for vram pages(MattB)
- Handle dma_buf_map requests for native and remote(MattB)
- Address if in never initialized block, set block to NULL
- Add lockdep in gpu buddy (MattB)
- Correct allocated_addr_to_block logic (MattA)
V6:
- Add more specific tests to noncritical bo sections
- Handle smooth exit of user created exec queues
- Break code and make purge specific static API
V5:
- Sysfs "max_pages" addition
- Reset block->private NULL post purge
- Remove wedge, return -EIO to system controller will initiate reset
- Add debugfs tests to trigger different test scenarios manually and via igt
- Rename addr_to_tbo to addr_to_block and move under gpu/buddy.c
V4: API reworks, add configfs for policy reservation and apply config everywhere
V3: use res_to_mem_region to avoid use of block->private (MattA)
V2:
- some fixes and clean up on errors
- Added xe_vram_addr_to_region helper to avoid other use of block->private(MattB)

IGT tests for testing this via injecting simple single address and
duplicate address fault to unit test functionality:
https://patchwork.freedesktop.org/patch/740601/

Tejas Upadhyay (9):
  drm/xe: Link VRAM object with gpu buddy
  [DO NOT MERGE]drm/gpu: Add gpu_buddy_allocated_addr_to_block helper
  drm/xe: Link LRC BO and its execution Queue
  drm/xe: Extend BO purge to handle vram pages as well
  drm/xe: Handle physical memory address error
  drm/xe/configfs: Add vram bad page reservation policy
  drm/xe/cri: Add sysfs interface for bad gpu vram pages
  drm/xe/uapi: Expose ban reason in EXEC_QUEUE_GET_PROPERTY_BAN
  drm/xe: Add fault-inject based VRAM page offline injection

 drivers/gpu/buddy.c                        |  53 ++
 drivers/gpu/drm/xe/xe_bo.c                 |  16 +-
 drivers/gpu/drm/xe/xe_bo.h                 |   5 +-
 drivers/gpu/drm/xe/xe_bo_types.h           |   3 +
 drivers/gpu/drm/xe/xe_configfs.c           |  64 ++-
 drivers/gpu/drm/xe/xe_configfs.h           |   2 +
 drivers/gpu/drm/xe/xe_debugfs.c            |  50 ++
 drivers/gpu/drm/xe/xe_debugfs.h            |   2 +
 drivers/gpu/drm/xe/xe_device_sysfs.c       |   7 +
 drivers/gpu/drm/xe/xe_dma_buf.c            |   3 +
 drivers/gpu/drm/xe/xe_exec_queue.c         |  14 +-
 drivers/gpu/drm/xe/xe_exec_queue_types.h   |   7 +-
 drivers/gpu/drm/xe/xe_execlist.c           |   4 +-
 drivers/gpu/drm/xe/xe_guc_submit.c         |  32 +-
 drivers/gpu/drm/xe/xe_lrc.c                |   1 +
 drivers/gpu/drm/xe/xe_pt.c                 |   3 +-
 drivers/gpu/drm/xe/xe_ttm_vram_mgr.c       | 610 ++++++++++++++++++++-
 drivers/gpu/drm/xe/xe_ttm_vram_mgr.h       |   3 +
 drivers/gpu/drm/xe/xe_ttm_vram_mgr_types.h |  28 +
 include/linux/gpu_buddy.h                  |   2 +
 include/uapi/drm/xe_drm.h                  |  12 +-
 21 files changed, 876 insertions(+), 45 deletions(-)

-- 
2.52.0