diff options
| author | Ralph Campbell <rcampbell@nvidia.com> | 2022-07-25 21:36:15 +0300 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-30 04:07:18 +0300 |
| commit | f6c3e1ae0114cd0f5123cf38187d450c1b119e67 (patch) | |
| tree | 73c02549c0758ccb1cc3af1a286fe82e30754da5 /tools/testing/selftests/vm | |
| parent | 68deb82a7bfcf67c6491c2387215e038b525475f (diff) | |
| download | linux-f6c3e1ae0114cd0f5123cf38187d450c1b119e67.tar.xz | |
mm/hmm: add a test for cross device private faults
Add a simple test case for when hmm_range_fault() is called with the
HMM_PFN_REQ_FAULT flag and a device private PTE is found for a device
other than the hmm_range::dev_private_owner. This should cause the page
to be faulted back to system memory from the other device and the PFN
returned in the output array.
Also, remove a piece of code that unnecessarily unmaps part of the buffer.
Link: https://lkml.kernel.org/r/20220727000837.4128709-3-rcampbell@nvidia.com
Link: https://lkml.kernel.org/r/20220725183615.4118795-3-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: Felix Kuehling <felix.kuehling@amd.com>
Cc: Philip Yang <Philip.Yang@amd.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/vm')
| -rw-r--r-- | tools/testing/selftests/vm/hmm-tests.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c index 716b62c05e3d..939a33dc5dc6 100644 --- a/tools/testing/selftests/vm/hmm-tests.c +++ b/tools/testing/selftests/vm/hmm-tests.c @@ -1603,9 +1603,19 @@ TEST_F(hmm2, double_map) for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) ASSERT_EQ(ptr[i], i); - /* Punch a hole after the first page address. */ - ret = munmap(buffer->ptr + self->page_size, self->page_size); + /* Migrate pages to device 1 and try to read from device 0. */ + ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, npages); + ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + + ret = hmm_dmirror_cmd(self->fd0, HMM_DMIRROR_READ, buffer, npages); ASSERT_EQ(ret, 0); + ASSERT_EQ(buffer->cpages, npages); + ASSERT_EQ(buffer->faults, 1); + + /* Check what device 0 read. */ + for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) + ASSERT_EQ(ptr[i], i); hmm_buffer_free(buffer); } |