diff mbox series

[v1,05/12] drm/amdkfd: ref count init for device pages

Message ID 20211012171247.2861-6-alex.sierra@amd.com (mailing list archive)
State New
Headers show
Series MEMORY_DEVICE_COHERENT for CPU-accessible coherent device memory | expand

Commit Message

Sierra Guiza, Alejandro (Alex) Oct. 12, 2021, 5:12 p.m. UTC 
Ref counter from device pages is init to zero during memmap init zone.
The first time a new device page is allocated to migrate data into it,
its ref counter needs to be initialized to one.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index dab290a4d19d..ffad39ffa8c6 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -220,7 +220,8 @@  svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn)
 	page = pfn_to_page(pfn);
 	svm_range_bo_ref(prange->svm_bo);
 	page->zone_device_data = prange->svm_bo;
-	get_page(page);
+	VM_BUG_ON_PAGE(page_ref_count(page), page);
+	init_page_count(page);
 	lock_page(page);
 }