[Intel-xe] [PATCH 0/4] drm/xe: Implement snapshot support.

[Maarten at mblankhorst.nl]

From: Maarten Lankhorst <dev at lankhorst.se>

Hopefully at least the uapi part can be merged. This takes a coredump in
2 steps:
1. On crash, take a snapshot of the VM layout, and a reference to the
bo's to dump.
2. On readout, take a snapshot of each bo to dump and release the
reference.

Because devcoredump is done in signaling context, we can't safely
allocate a lot of memory, or do things like mmap, etc. As such, we have
to wait for readout time to map the BO and copy its contents. This means
that userspace may in the worst case overwrite data after the hang, but
hopefully this is not a serious problem.

Needs more testing..

Maarten Lankhorst (4):
  drm/xe: Add uapi for dumpable bos
  drm/xe: Annotate each dumpable vma as such
  drm/xe: Add vm snapshot mutex for easily taking a vm snapshot during
    devcoredump
  drm/xe: Implement VM snapshot support

 drivers/gpu/drm/xe/xe_devcoredump.c       |   9 ++
 drivers/gpu/drm/xe/xe_devcoredump_types.h |   2 +
 drivers/gpu/drm/xe/xe_vm.c                | 150 ++++++++++++++++++++--
 drivers/gpu/drm/xe/xe_vm.h                |   4 +
 drivers/gpu/drm/xe/xe_vm_types.h          |   8 ++
 include/uapi/drm/xe_drm.h                 |   4 +
 6 files changed, 169 insertions(+), 8 deletions(-)

-- 
2.40.1