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Thu, 22 Oct 2026 09:33:54 -0700 (PDT) Received: from i4-gl-tmk5904.ad.psu.edu ([130.203.156.186]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91c36f0abedsm1511396d6.3.2026.10.22.09.33.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 09:33:54 -0700 (PDT) From: Yuho Choi To: Sven Peter , Janne Grunau , Joerg Roedel , Will Deacon Cc: Neal Gompa , Robin Murphy , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Yuho Choi Subject: [PATCH v1] iommu/apple-dart: Report TLB flush failures from iotlb_sync_map Date: Thu, 22 Oct 2026 12:33:40 -0400 Message-ID: <20261022163350.23743-2-oss.patchbox@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: iommu@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit apple_dart_iotlb_sync_map() flushes the TLBs of every DART the domain is attached to after a new mapping has been written. The invalidate_tlb() callbacks return -ETIMEDOUT when the busy bit does not clear in time, but apple_dart_domain_flush_tlb() drops the result and the callback always returns 0, so iommu_map() reports success although the flush did not complete. Since commit fa4c4507099f ("iommu: Allow .iotlb_sync_map to fail and handle s390's -ENOMEM return"), iommu_map() unmaps the range and fails when .iotlb_sync_map() returns an error. Return the error from apple_dart_domain_flush_tlb(), after still flushing every DART of the domain. Signed-off-by: Yuho Choi --- The unmap path is not changed, as .iotlb_sync() and .flush_iotlb_all() cannot report a failure. drivers/iommu/apple-dart.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index b160fb464c5f..1119769f9f51 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -494,9 +494,9 @@ static int apple_dart_hw_reset(struct apple_dart *dart) return dart->hw->invalidate_tlb(&stream_map); } -static void apple_dart_domain_flush_tlb(struct apple_dart_domain *domain) +static int apple_dart_domain_flush_tlb(struct apple_dart_domain *domain) { - int i, j; + int i, j, ret = 0; struct apple_dart_atomic_stream_map *domain_stream_map; struct apple_dart_stream_map stream_map; @@ -506,8 +506,11 @@ static void apple_dart_domain_flush_tlb(struct apple_dart_domain *domain) for (j = 0; j < BITS_TO_LONGS(stream_map.dart->num_streams); j++) stream_map.sidmap[j] = atomic_long_read(&domain_stream_map->sidmap[j]); - stream_map.dart->hw->invalidate_tlb(&stream_map); + /* Flush every DART even if one of them fails. */ + ret = stream_map.dart->hw->invalidate_tlb(&stream_map) ?: ret; } + + return ret; } static void apple_dart_flush_iotlb_all(struct iommu_domain *domain) @@ -524,8 +527,7 @@ static void apple_dart_iotlb_sync(struct iommu_domain *domain, static int apple_dart_iotlb_sync_map(struct iommu_domain *domain, unsigned long iova, size_t size) { - apple_dart_domain_flush_tlb(to_dart_domain(domain)); - return 0; + return apple_dart_domain_flush_tlb(to_dart_domain(domain)); } static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain, base-commit: c03c1a14507dfaf8b856c2608f9ac216021fc222 -- 2.43.0