Re: [PATCH v2 hmm 0/9] Small hmm_range_fault() cleanups

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On 3/23/20 6:14 PM, Jason Gunthorpe wrote:
From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>

This is v2 of the first simple series with a few additional patches of little
adjustments.

This needs an additional patch to the hmm tester:

diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c
index 033a12c7ab5b6d..da15471a2bbf9a 100644
--- a/tools/testing/selftests/vm/hmm-tests.c
+++ b/tools/testing/selftests/vm/hmm-tests.c
@@ -1274,7 +1274,7 @@ TEST_F(hmm2, snapshot)
  	/* Check what the device saw. */
  	m = buffer->mirror;
  	ASSERT_EQ(m[0], HMM_DMIRROR_PROT_ERROR);
-	ASSERT_EQ(m[1], HMM_DMIRROR_PROT_NONE);
+	ASSERT_EQ(m[1], HMM_DMIRROR_PROT_ERROR);
  	ASSERT_EQ(m[2], HMM_DMIRROR_PROT_ZERO | HMM_DMIRROR_PROT_READ);
  	ASSERT_EQ(m[3], HMM_DMIRROR_PROT_READ);
  	ASSERT_EQ(m[4], HMM_DMIRROR_PROT_WRITE);

v2 changes:
  - Simplify and rename the flags, rework hmm_vma_walk_test in patch 2 (CH)
  - Adjust more comments in patch 3 (CH, Ralph)
  - Put the ugly boolean logic into a function in patch 3 (CH)
  - Update commit message of patch 4 (CH)
  - Adjust formatting in patch 5 (CH)
  Patches 6, 7, 8 are new

v1: https://lore.kernel.org/r/20200320164905.21722-1-jgg@xxxxxxxx

Jason Gunthorpe (9):
   mm/hmm: remove pgmap checking for devmap pages
   mm/hmm: return the fault type from hmm_pte_need_fault()
   mm/hmm: remove unused code and tidy comments
   mm/hmm: remove HMM_FAULT_SNAPSHOT
   mm/hmm: remove the CONFIG_TRANSPARENT_HUGEPAGE #ifdef
   mm/hmm: use device_private_entry_to_pfn()
   mm/hmm: do not unconditionally set pfns when returning EBUSY
   mm/hmm: do not set pfns when returning an error code
   mm/hmm: return error for non-vma snapshots

  Documentation/vm/hmm.rst                |  12 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |   2 +-
  drivers/gpu/drm/nouveau/nouveau_svm.c   |   2 +-
  include/linux/hmm.h                     | 109 +--------
  mm/hmm.c                                | 312 ++++++++++--------------
  5 files changed, 133 insertions(+), 304 deletions(-)


I was able to recompile Karol Herbst's mesa tree and Jerome's SVM tests to
test this with nouveau so for the series you can add,
Tested-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
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