RE: [PATCH v2 09/10] drm/ttm: Don't count pages in SG BOs against pages_limit

["Errabolu, Ramesh" <Ramesh.Errabolu@xxxxxxx>]

[AMD Official Use Only - Internal Distribution Only]

Acked-by: Ramesh Errabolu <ramesh.errabolu@xxxxxxx>

-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Kuehling, Felix
Sent: Wednesday, April 21, 2021 8:31 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [PATCH v2 09/10] drm/ttm: Don't count pages in SG BOs against pages_limit

Pages in SG BOs were not allocated by TTM. So don't count them against TTM's pages limit.

Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
 drivers/gpu/drm/ttm/ttm_tt.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 5d8820725b75..e8b8c3257392 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -317,9 +317,12 @@ int ttm_tt_populate(struct ttm_device *bdev,
 	if (ttm_tt_is_populated(ttm))
 		return 0;
 
-	atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
-	if (bdev->pool.use_dma32)
-		atomic_long_add(ttm->num_pages, &ttm_dma32_pages_allocated);
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+		atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_add(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 
 	while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
 	       atomic_long_read(&ttm_dma32_pages_allocated) > @@ -350,9 +353,12 @@ int ttm_tt_populate(struct ttm_device *bdev,
 	return 0;
 
 error:
-	atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
-	if (bdev->pool.use_dma32)
-		atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 	return ret;
 }
 EXPORT_SYMBOL(ttm_tt_populate);
@@ -382,9 +388,12 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
 	else
 		ttm_pool_free(&bdev->pool, ttm);
 
-	atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
-	if (bdev->pool.use_dma32)
-		atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
+		if (bdev->pool.use_dma32)
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 
 	ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;  }
--
2.31.1

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