On Sat, 27 Jun 2020 at 07:04, Ralph Campbell rcampbell@nvidia.com wrote:
If system memory is migrated to device private memory and no GPU MMU page table entry exists, the GPU will fault and call hmm_range_fault() to get the PFN for the page. Since the .dev_private_owner pointer in struct hmm_range is not set, hmm_range_fault returns an error which results in the GPU program stopping with a fatal fault. Fix this by setting .dev_private_owner appropriately.
Fixes: 08ddddda667b ("mm/hmm: check the device private page owner in hmm_range_fault()") Cc: stable@vger.kernel.org Signed-off-by: Ralph Campbell rcampbell@nvidia.com Reviewed-by: Jason Gunthorpe jgg@mellanox.com
This is based on Linux-5.8.0-rc2 and is for Ben Skeggs nouveau tree. It doesn't depend on any of the other nouveau/HMM changes I have recently posted.
Resending to include stable@vger.org and adding Jason's reviewed-by.
Thanks Ralph,
I've got the patch locally, and will push it out later on today.
Ben.
drivers/gpu/drm/nouveau/nouveau_svm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c index ba9f9359c30e..6586d9d39874 100644 --- a/drivers/gpu/drm/nouveau/nouveau_svm.c +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c @@ -562,6 +562,7 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm, .end = notifier->notifier.interval_tree.last + 1, .pfn_flags_mask = HMM_PFN_REQ_FAULT | HMM_PFN_REQ_WRITE, .hmm_pfns = hmm_pfns,
.dev_private_owner = drm->dev, }; struct mm_struct *mm = notifier->notifier.mm; int ret;-- 2.20.1
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