From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88D2038F255 for ; Wed, 22 Jul 2026 22:34:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784759687; cv=none; b=UNvQWIdHmLwar5n9P0ArvCqUbab64jmplctvH1Vr6+HaOeI9/BFEhiz6cg9Z0VCJMA2V1UCGcNjDxG35265sgiQp5M1wl1gEStQzSkBbolfuA6OxdsEDJOxHg0tegrKKU8nZhRNGjiBOX+Gr9HLiDsuNiA0G/3rM4ep9jFr+ZX0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784759687; c=relaxed/simple; bh=rIkFzeT1EUiIoJEfljmjaMFMAZWzb68ndhglTvM/nhQ=; h=Date:To:From:Subject:Message-Id; b=DKPdfrQrbIcGo033rq/5cH8l6rxwKWZNOsu10h0FqVL0nbQ8RRG8V8lBd42YrRHdO9xYgns5bIXcx0SxoOJfXPwVtcDSvODH4YQlwgMtqjN204iXqwfanAQZ3Q5Wa9gX4D/GLYid3mTLewWif3VlFqxstcrVye14+QUV+h5sc9M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=MQ5tqyuH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="MQ5tqyuH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5BCB21F000E9; Wed, 22 Jul 2026 22:34:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1784759686; bh=tONSW50nBS5y35PUZc+Suatmsvgq76BIC3bBlJfemTA=; h=Date:To:From:Subject; b=MQ5tqyuH4Ej7H29vFc0fhKsqSvOqM3wrVHSh6nUGVbmH6X5La+enTvLTiuQcuGS2p ApwIRGby0IQvynI1GXjAmDikdLdxl989Tq9bs2Tjhr0826ctbG/IAC7KDORhNVxT/l HZRuQ5fJ8EKOEy0o9NyZxtkCnD2yeuLG/ZPpy3ns= Date: Wed, 22 Jul 2026 15:34:45 -0700 To: mm-commits@vger.kernel.org,skinsburskii@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] drm-nouveau-use-hmm_range_fault_unlocked_timeout-for-svm-faults.patch removed from -mm tree Message-Id: <20260722223446.5BCB21F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: drm/nouveau: use hmm_range_fault_unlocked_timeout() for SVM faults has been removed from the -mm tree. Its filename was drm-nouveau-use-hmm_range_fault_unlocked_timeout-for-svm-faults.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Stanislav Kinsburskii Subject: drm/nouveau: use hmm_range_fault_unlocked_timeout() for SVM faults Date: Wed, 15 Jul 2026 11:16:30 -0700 nouveau_range_fault() takes mmap_read_lock() only to call hmm_range_fault(). It also keeps a single HMM_RANGE_DEFAULT_TIMEOUT deadline across both HMM -EBUSY retries and post-fault mmu_interval_read_retry() retries. Use hmm_range_fault_unlocked_timeout() instead. The HMM helper now owns the mmap lock and refreshes range->notifier_seq for its internal retries. Nouveau keeps its existing absolute deadline in the outer loop and passes the remaining jiffies to the helper for each fault attempt, so retries caused by mmu_interval_read_retry() do not reset the overall retry budget. Nouveau still validates the interval notifier sequence while holding svmm->mutex before programming the GPU mapping. Link: https://lore.kernel.org/178413939024.1155966.6246787744253724390.stgit@skinsburskii Signed-off-by: Stanislav Kinsburskii Reviewed-by: Jason Gunthorpe Cc: Danilo Krummrich Cc: Dave Airlie Cc: David Hildenbrand Cc: Dexuan Cui Cc: Haiyang Zhang Cc: Jonathan Corbet Cc: Kees Cook Cc: K. Y. Srinivasan Cc: Leon Romanovsky Cc: Liam R. Howlett Cc: Lizhi Hou Cc: Long Li Cc: Lorenzo Stoakes Cc: Lyude Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Michal Hocko Cc: Mike Rapoport Cc: Oded Gabbay Cc: Oleg Nesterov Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Thomas Zimemrmann Cc: Vlastimil Babka Cc: Wei Liu Signed-off-by: Andrew Morton --- drivers/gpu/drm/nouveau/nouveau_svm.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) --- a/drivers/gpu/drm/nouveau/nouveau_svm.c~drm-nouveau-use-hmm_range_fault_unlocked_timeout-for-svm-faults +++ a/drivers/gpu/drm/nouveau/nouveau_svm.c @@ -678,20 +678,22 @@ static int nouveau_range_fault(struct no range.end = notifier->notifier.interval_tree.last + 1; while (true) { - if (time_after(jiffies, timeout)) { + long remaining = timeout - jiffies; + + /* + * The HMM timeout only bounds retries while HMM is walking and + * faulting the range. This fault is handled by a kernel worker, + * so fatal signals from the faulting process cannot stop an + * endless stream of invalidations here. + */ + if (time_after_eq(jiffies, timeout)) { ret = -EBUSY; goto out; } - range.notifier_seq = mmu_interval_read_begin(range.notifier); - mmap_read_lock(mm); - ret = hmm_range_fault(&range); - mmap_read_unlock(mm); - if (ret) { - if (ret == -EBUSY) - continue; + ret = hmm_range_fault_unlocked_timeout(&range, remaining); + if (ret) goto out; - } mutex_lock(&svmm->mutex); if (mmu_interval_read_retry(range.notifier, _ Patches currently in -mm which might be from skinsburskii@gmail.com are rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults.patch accel-amdxdna-use-hmm_range_fault_unlocked_timeout-for-range-population.patch drm-gpusvm-use-hmm_range_fault_unlocked_timeout-for-range-faults.patch