Re: [PATCH v6 02/13] drm/amdkfd: Use migrate pfns internally

A future change will remove device private pages from the physical
address space. This will mean that device private pages no longer have a
pfn.

A MIGRATE_PFN flag will be introduced that distinguishes between mpfns
that contain a pfn vs an offset into device private memory.

Replace usages of pfns and page_to_pfn() with mpfns and
migrate_pfn_to_page() to prepare for handling this distinction. This
will assist in continuing to use the same code paths for both
MEMORY_DEVICE_PRIVATE and MEMORY_DEVICE_COHERENT devices.

Acked-by: Balbir Singh <redacted>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Jordan Niethe <redacted>
---
v2:
  - New to series
v3:
  - No change
v4:
  - No change
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 15 +++++++--------
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.h |  2 +-
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 297fa108ccf9..b6075a2808c2 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

@@ -210,17 +210,17 @@ svm_migrate_copy_done(struct amdgpu_device *adev, struct dma_fence *mfence)
 }
 
 unsigned long
-svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr)
+svm_migrate_addr_to_mpfn(struct amdgpu_device *adev, unsigned long addr)
 {
-	return (addr + adev->kfd.pgmap.range.start) >> PAGE_SHIFT;
+	return migrate_pfn((addr + adev->kfd.pgmap.range.start) >> PAGE_SHIFT);
 }