drm/amdkfd: add invalid pages debug at vram migration

This is for debug purposes only.
It conditionally generates partial migrations to test mixed
CPU/GPU memory domain pages in a prange easily.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 610f33f..3a51384 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -353,6 +353,20 @@ out_free_vram_pages:
                }
        }
 
+#ifdef DEBUG_FORCE_MIXED_DOMAINS
+       for (i = 0, j = 0; i < npages; i += 4, j++) {
+               if (j & 1)
+                       continue;
+               svm_migrate_put_vram_page(adev, dst[i]);
+               migrate->dst[i] = 0;
+               svm_migrate_put_vram_page(adev, dst[i + 1]);
+               migrate->dst[i + 1] = 0;
+               svm_migrate_put_vram_page(adev, dst[i + 2]);
+               migrate->dst[i + 2] = 0;
+               svm_migrate_put_vram_page(adev, dst[i + 3]);
+               migrate->dst[i + 3] = 0;
+       }
+#endif
 out:
        return r;
 }