[Intel-gfx] [RFC v2 00/12] drm/i915/svm: Add SVM support

[Niranjana Vishwanathapura]

Shared Virtual Memory (SVM) allows the programmer to use a single virtual
address space which will be shared between threads executing on CPUs and GPUs.
It abstracts away from the user the location of the backing memory, and hence
simplifies the user programming model.
SVM supports two types of virtual memory allocation methods.
Runtime allocator requires the driver to provide memory allocation and
management interface, like buffer object (BO) interface.
Whereas system allocator makes use of default OS memory allocation and
management support like malloc().

This patch series adds both SVM system and runtime allocator support
to i915 driver.

The patch series includes
 - SVM support for both system and runtime allocation.
 - Plugin in device memory with the Linux kernel.
 - User API advertising SVM capability and configuration by user on per
   vm basis.
 - User API to bind an address range or a BO with a device page table.
 - User API to prefetch an address range to device memory.
 - Implicit migration by moving pages or BOs back from device to host
   memory upon CPU access.
 - CPU copy and blitter copy support for migrating the pages/BOs.
 - Large page mapping support
 - Page table dump support.

References:
https://www.kernel.org/doc/Documentation/vm/hmm.rst
The HMM use cases in the Linux kernel.
Test RFC series
   "[RFC i-g-t 0/7] tests/i915/svm: Shared Virtual Memory (SVM) test"

v2:
- Use updated HMM API
- HMM usage changes as per review feedback
- UAPI name change as per review feedback
- Reformat RFC series
- Some minor fixes

Niranjana Vishwanathapura (11):
  drm/i915/svm: Add SVM documentation
  drm/i915/svm: Runtime (RT) allocator support
  drm/i915/svm: Page table update support for SVM
  drm/i915/svm: Page table mirroring support
  drm/i915/svm: Device memory support
  drm/i915/svm: Implicitly migrate pages upon CPU fault
  drm/i915/svm: Page copy support during migration
  drm/i915/svm: Add functions to blitter copy SVM buffers
  drm/i915/svm: Use blitter copy for migration
  drm/i915/svm: Add support to en/disable SVM
  drm/i915/svm: Add page table dump support

Venkata Sandeep Dhanalakota (1):
  drm/i915/svm: Implicitly migrate BOs upon CPU access

 Documentation/gpu/i915.rst                    |  29 +
 drivers/gpu/drm/i915/Kconfig                  |  23 +
 drivers/gpu/drm/i915/Kconfig.debug            |  14 +
 drivers/gpu/drm/i915/Makefile                 |   6 +
 drivers/gpu/drm/i915/gem/i915_gem_context.c   |  95 ++-
 drivers/gpu/drm/i915/gem/i915_gem_context.h   |   2 +
 .../gpu/drm/i915/gem/i915_gem_context_types.h |   1 +
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    |  65 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |  10 +
 drivers/gpu/drm/i915/gem/i915_gem_object.c    |  43 +-
 drivers/gpu/drm/i915/gem/i915_gem_object.h    |   6 +
 drivers/gpu/drm/i915/gem/i915_gem_svm.c       |  60 ++
 drivers/gpu/drm/i915/gem/i915_gem_svm.h       |  22 +
 drivers/gpu/drm/i915/gem/i915_gem_wait.c      |   2 +-
 drivers/gpu/drm/i915/i915_buddy.h             |  12 +
 drivers/gpu/drm/i915/i915_drv.c               |  31 +-
 drivers/gpu/drm/i915/i915_drv.h               |  32 +
 drivers/gpu/drm/i915/i915_gem_gtt.c           | 158 +++-
 drivers/gpu/drm/i915/i915_gem_gtt.h           |  41 +
 drivers/gpu/drm/i915/i915_getparam.c          |   3 +
 drivers/gpu/drm/i915/i915_svm.c               | 330 ++++++++
 drivers/gpu/drm/i915/i915_svm.h               |  71 ++
 drivers/gpu/drm/i915/i915_svm_copy.c          | 172 ++++
 drivers/gpu/drm/i915/i915_svm_devmem.c        | 781 ++++++++++++++++++
 drivers/gpu/drm/i915/intel_memory_region.c    |   4 -
 drivers/gpu/drm/i915/intel_memory_region.h    |  18 +
 drivers/gpu/drm/i915/intel_region_lmem.c      |  10 +
 include/uapi/drm/i915_drm.h                   |  73 ++
 28 files changed, 2078 insertions(+), 36 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_svm.c
 create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_svm.h
 create mode 100644 drivers/gpu/drm/i915/i915_svm.c
 create mode 100644 drivers/gpu/drm/i915/i915_svm.h
 create mode 100644 drivers/gpu/drm/i915/i915_svm_copy.c
 create mode 100644 drivers/gpu/drm/i915/i915_svm_devmem.c

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2.21.0.rc0.32.g243a4c7e27