blob: 263a23dd94b62783b6828c5fc0f0c34ad737ff21 [file] [log] [blame]
From cdcc307050faf69e422c2e9f6d8fb3ad724e4bba Mon Sep 17 00:00:00 2001
From: Ralph Campbell <rcampbell@nvidia.com>
Date: Tue, 3 Mar 2020 16:13:36 -0800
Subject: [PATCH] drm/nouveau/svm: fix vma range check for migration
commit b92103b559c77abc5f8b7bec269230a219c880b7 upstream.
find_vma_intersection(mm, start, end) only guarantees that end is greater
than or equal to vma->vm_start but doesn't guarantee that start is
greater than or equal to vma->vm_start. The calculation for the
intersecting range in nouveau_svmm_bind() isn't accounting for this and
can call migrate_vma_setup() with a starting address less than
vma->vm_start. This results in migrate_vma_setup() returning -EINVAL for
the range instead of nouveau skipping that part of the range and migrating
the rest.
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index e6943fab1b5b..fd10499329bf 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -186,6 +186,7 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
if (!vma)
break;
+ addr = max(addr, vma->vm_start);
next = min(vma->vm_end, end);
/* This is a best effort so we ignore errors */
nouveau_dmem_migrate_vma(cli->drm, vma, addr, next);
--
2.7.4