linux-kernel - [PATCH v3 2/4] nouveau/hmm: check for SVM initialized before migrating

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Date:   Tue, 3 Mar 2020 16:13:37 -0800
From:   Ralph Campbell <rcampbell@...dia.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-rdma@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <nouveau@...ts.freedesktop.org>
CC:     Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        "Ralph Campbell" <rcampbell@...dia.com>
Subject: [PATCH v3 2/4] nouveau/hmm: check for SVM initialized before migrating

When migrating system memory to GPU memory, check that SVM has been
enabled. Even though most errors can be ignored since migration is
a performance optimization, return an error because this is a violation
of the API.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
---
 drivers/gpu/drm/nouveau/nouveau_svm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 169320409286..c567526b75b8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -171,6 +171,11 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
 	mm = get_task_mm(current);
 	down_read(&mm->mmap_sem);
 
+	if (!cli->svm.svmm) {
+		up_read(&mm->mmap_sem);
+		return -EINVAL;
+	}
+
 	for (addr = args->va_start, end = args->va_start + size; addr < end;) {
 		struct vm_area_struct *vma;
 		unsigned long next;
-- 
2.20.1