[PATCH hmm 0/6] Small hmm_range_fault() cleanups

From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Felix.Kuehling@amd.com
Cc: Philip Yang <Philip.Yang@amd.com>,
	John Hubbard <jhubbard@nvidia.com>,
	amd-gfx@lists.freedesktop.org, linux-mm@kvack.org,
	Jason Gunthorpe <jgg@mellanox.com>,
	dri-devel@lists.freedesktop.org, Christoph Hellwig <hch@lst.de>
Subject: [PATCH hmm 0/6] Small hmm_range_fault() cleanups
Date: Fri, 20 Mar 2020 13:48:59 -0300	[thread overview]
Message-ID: <20200320164905.21722-1-jgg@ziepe.ca> (raw)

From: Jason Gunthorpe <jgg@mellanox.com>

I've had these in my work queue for a bit, nothing profound here, just some
small edits for clarity.

Ralph's hmm tester will need a small diff to work after this - which
illustrates how setting default_flags == 0 is the same as what was called
SNAPSHOT:

diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 6ca953926dc13f..5f31f5b3e64cb9 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -300,7 +300,7 @@ static int dmirror_range_fault(struct dmirror *dmirror,
 
 		range->notifier_seq = mmu_interval_read_begin(range->notifier);
 		down_read(&mm->mmap_sem);
-		count = hmm_range_fault(range, 0);
+		count = hmm_range_fault(range);
 		up_read(&mm->mmap_sem);
 		if (count <= 0) {
 			if (count == 0 || count == -EBUSY)
@@ -337,8 +337,7 @@ static int dmirror_fault(struct dmirror *dmirror, unsigned long start,
 		.flags = dmirror_hmm_flags,
 		.values = dmirror_hmm_values,
 		.pfn_shift = DPT_SHIFT,
-		.pfn_flags_mask = ~(dmirror_hmm_flags[HMM_PFN_VALID] |
-				    dmirror_hmm_flags[HMM_PFN_WRITE]),
+		.pfn_flags_mask = 0,
 		.default_flags = dmirror_hmm_flags[HMM_PFN_VALID] |
 				(write ? dmirror_hmm_flags[HMM_PFN_WRITE] : 0),
 		.dev_private_owner = dmirror->mdevice,
@@ -872,7 +871,7 @@ static int dmirror_range_snapshot(struct dmirror *dmirror,
 		range->notifier_seq = mmu_interval_read_begin(range->notifier);
 
 		down_read(&mm->mmap_sem);
-		count = hmm_range_fault(range, HMM_FAULT_SNAPSHOT);
+		count = hmm_range_fault(range);
 		up_read(&mm->mmap_sem);
 		if (count <= 0) {
 			if (count == 0 || count == -EBUSY)
@@ -916,7 +915,7 @@ static int dmirror_snapshot(struct dmirror *dmirror,
 		.flags = dmirror_hmm_flags,
 		.values = dmirror_hmm_values,
 		.pfn_shift = DPT_SHIFT,
-		.pfn_flags_mask = ~0ULL,
+		.pfn_flags_mask = 0,
 		.dev_private_owner = dmirror->mdevice,
 	};
 	int ret = 0;

Jason Gunthorpe (6):
  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()

 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                     |  55 +-----
 mm/hmm.c                                | 238 +++++++++---------------
 5 files changed, 98 insertions(+), 211 deletions(-)

-- 
2.25.1

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