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From: Alex Sierra <alex.sierra@amd.com>
To: akpm@linux-foundation.org, Felix.Kuehling@amd.com,
	linux-mm@kvack.org, rcampbell@nvidia.com,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	hch@lst.de, jgg@nvidia.com, jglisse@redhat.com
Subject: [PATCH v2 05/12] drm/amdkfd: ref count init for device pages
Date: Mon, 13 Sep 2021 11:15:57 -0500	[thread overview]
Message-ID: <20210913161604.31981-6-alex.sierra@amd.com> (raw)
In-Reply-To: <20210913161604.31981-1-alex.sierra@amd.com>

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 --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);
 }
 
-- 
2.32.0


  parent reply	other threads:[~2021-09-13 16:16 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 16:15 [PATCH v2 00/12] MEMORY_DEVICE_PUBLIC for CPU-accessible coherent device memory Alex Sierra
2021-09-13 16:15 ` [PATCH v2 01/12] ext4/xfs: add page refcount helper Alex Sierra
2021-09-13 16:15 ` [PATCH v2 02/12] mm: remove extra ZONE_DEVICE struct page refcount Alex Sierra
2021-09-15  5:32   ` Ralph Campbell
2021-09-15  5:32     ` Ralph Campbell
2021-09-13 16:15 ` [PATCH v2 03/12] mm: add zone device public type memory support Alex Sierra
2021-09-13 16:15 ` [PATCH v2 04/12] mm: add device public vma selection for memory migration Alex Sierra
2021-09-13 16:15 ` Alex Sierra [this message]
2021-09-13 16:15 ` [PATCH v2 06/12] drm/amdkfd: add SPM support for SVM Alex Sierra
2021-09-13 16:15 ` [PATCH v2 07/12] drm/amdkfd: public type as sys mem on migration to ram Alex Sierra
2021-09-13 16:16 ` [PATCH v2 08/12] lib: test_hmm add ioctl to get zone device type Alex Sierra
2021-09-13 16:16 ` [PATCH v2 09/12] lib: test_hmm add module param for " Alex Sierra
2021-09-20  8:53   ` Alistair Popple
2021-09-20 20:05     ` Sierra Guiza, Alejandro (Alex)
2021-09-21  5:14       ` Alistair Popple
2021-09-23 15:52         ` Sierra Guiza, Alejandro (Alex)
2021-10-01  0:28           ` Alistair Popple
2021-09-13 16:16 ` [PATCH v2 10/12] lib: add support for device public type in test_hmm Alex Sierra
2021-10-01  1:32   ` Alistair Popple
2021-09-13 16:16 ` [PATCH v2 11/12] tools: update hmm-test to support device public type Alex Sierra
2021-09-13 16:16 ` [PATCH v2 12/12] tools: update test_hmm script to support SP config Alex Sierra

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