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Message-ID: <20210616105937.23201-10-apopple@nvidia.com>
Date: Wed, 16 Jun 2021 20:59:36 +1000
From: Alistair Popple <apopple@...dia.com>
To: <akpm@...ux-foundation.org>
CC: <linux-mm@...ck.org>, <rcampbell@...dia.com>,
<willy@...radead.org>, <linux-doc@...r.kernel.org>,
<nouveau@...ts.freedesktop.org>, <hughd@...gle.com>,
<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<hch@...radead.org>, <peterx@...hat.com>, <shakeelb@...gle.com>,
<bskeggs@...hat.com>, <jgg@...dia.com>, <jhubbard@...dia.com>,
Alistair Popple <apopple@...dia.com>
Subject: [PATCH v11 09/10] nouveau/svm: Refactor nouveau_range_fault
Call mmu_interval_notifier_insert() as part of nouveau_range_fault().
This doesn't introduce any functional change but makes it easier for a
subsequent patch to alter the behaviour of nouveau_range_fault() to
support GPU atomic operations.
Signed-off-by: Alistair Popple <apopple@...dia.com>
Reviewed-by: Ben Skeggs <bskeggs@...hat.com>
---
v9:
* Added Ben's Reviewed-By (thanks!)
---
drivers/gpu/drm/nouveau/nouveau_svm.c | 34 ++++++++++++++++-----------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 94f841026c3b..a195e48c9aee 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -567,18 +567,27 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
unsigned long hmm_pfns[1];
struct hmm_range range = {
.notifier = ¬ifier->notifier,
- .start = notifier->notifier.interval_tree.start,
- .end = notifier->notifier.interval_tree.last + 1,
.default_flags = hmm_flags,
.hmm_pfns = hmm_pfns,
.dev_private_owner = drm->dev,
};
- struct mm_struct *mm = notifier->notifier.mm;
+ struct mm_struct *mm = svmm->notifier.mm;
int ret;
+ ret = mmu_interval_notifier_insert(¬ifier->notifier, mm,
+ args->p.addr, args->p.size,
+ &nouveau_svm_mni_ops);
+ if (ret)
+ return ret;
+
+ range.start = notifier->notifier.interval_tree.start;
+ range.end = notifier->notifier.interval_tree.last + 1;
+
while (true) {
- if (time_after(jiffies, timeout))
- return -EBUSY;
+ if (time_after(jiffies, timeout)) {
+ ret = -EBUSY;
+ goto out;
+ }
range.notifier_seq = mmu_interval_read_begin(range.notifier);
mmap_read_lock(mm);
@@ -587,7 +596,7 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
if (ret) {
if (ret == -EBUSY)
continue;
- return ret;
+ goto out;
}
mutex_lock(&svmm->mutex);
@@ -606,6 +615,9 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
svmm->vmm->vmm.object.client->super = false;
mutex_unlock(&svmm->mutex);
+out:
+ mmu_interval_notifier_remove(¬ifier->notifier);
+
return ret;
}
@@ -727,14 +739,8 @@ nouveau_svm_fault(struct nvif_notify *notify)
}
notifier.svmm = svmm;
- ret = mmu_interval_notifier_insert(¬ifier.notifier, mm,
- args.i.p.addr, args.i.p.size,
- &nouveau_svm_mni_ops);
- if (!ret) {
- ret = nouveau_range_fault(svmm, svm->drm, &args.i,
- sizeof(args), hmm_flags, ¬ifier);
- mmu_interval_notifier_remove(¬ifier.notifier);
- }
+ ret = nouveau_range_fault(svmm, svm->drm, &args.i,
+ sizeof(args), hmm_flags, ¬ifier);
mmput(mm);
limit = args.i.p.addr + args.i.p.size;
--
2.20.1
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