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Nicolin Chen 655e607898 iommu/arm-smmu-v3: Fix iommu_device_probe bug due to duplicated stream ids 
[ Upstream commit b00d24997a ]

ASPEED VGA card has two built-in devices:
 0008:06:00.0 PCI bridge: ASPEED Technology, Inc. AST1150 PCI-to-PCI Bridge (rev 06)
 0008:07:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics Family (rev 52)

Its toplogy looks like this:
 +-[0008:00]---00.0-[01-09]--+-00.0-[02-09]--+-00.0-[03]----00.0  Sandisk Corp Device 5017
                             |               +-01.0-[04]--
                             |               +-02.0-[05]----00.0  NVIDIA Corporation Device
                             |               +-03.0-[06-07]----00.0-[07]----00.0  ASPEED Technology, Inc. ASPEED Graphics Family
                             |               +-04.0-[08]----00.0  Renesas Technology Corp. uPD720201 USB 3.0 Host Controller
                             |               \-05.0-[09]----00.0  Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
                             \-00.1  PMC-Sierra Inc. Device 4028

The IORT logic populaties two identical IDs into the fwspec->ids array via
DMA aliasing in iort_pci_iommu_init() called by pci_for_each_dma_alias().

Though the SMMU driver had been able to handle this situation since commit
563b5cbe33 ("iommu/arm-smmu-v3: Cope with duplicated Stream IDs"), that
got broken by the later commit cdf315f907 ("iommu/arm-smmu-v3: Maintain
a SID->device structure"), which ended up with allocating separate streams
with the same stuffing.

On a kernel prior to v6.15-rc1, there has been an overlooked warning:
  pci 0008:07:00.0: vgaarb: setting as boot VGA device
  pci 0008:07:00.0: vgaarb: bridge control possible
  pci 0008:07:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
  pcieport 0008:06:00.0: Adding to iommu group 14
  ast 0008:07:00.0: stream 67328 already in tree   <===== WARNING
  ast 0008:07:00.0: enabling device (0002 -> 0003)
  ast 0008:07:00.0: Using default configuration
  ast 0008:07:00.0: AST 2600 detected
  ast 0008:07:00.0: [drm] Using analog VGA
  ast 0008:07:00.0: [drm] dram MCLK=396 Mhz type=1 bus_width=16
  [drm] Initialized ast 0.1.0 for 0008:07:00.0 on minor 0
  ast 0008:07:00.0: [drm] fb0: astdrmfb frame buffer device

With v6.15-rc, since the commit bcb81ac6ae ("iommu: Get DT/ACPI parsing
into the proper probe path"), the error returned with the warning is moved
to the SMMU device probe flow:
  arm_smmu_probe_device+0x15c/0x4c0
  __iommu_probe_device+0x150/0x4f8
  probe_iommu_group+0x44/0x80
  bus_for_each_dev+0x7c/0x100
  bus_iommu_probe+0x48/0x1a8
  iommu_device_register+0xb8/0x178
  arm_smmu_device_probe+0x1350/0x1db0
which then fails the entire SMMU driver probe:
  pci 0008:06:00.0: Adding to iommu group 21
  pci 0008:07:00.0: stream 67328 already in tree
  arm-smmu-v3 arm-smmu-v3.9.auto: Failed to register iommu
  arm-smmu-v3 arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22

Since SMMU driver had been already expecting a potential duplicated Stream
ID in arm_smmu_install_ste_for_dev(), change the arm_smmu_insert_master()
routine to ignore a duplicated ID from the fwspec->sids array as well.

Note: this has been failing the iommu_device_probe() since 2021, although a
recent iommu commit in v6.15-rc1 that moves iommu_device_probe() started to
fail the SMMU driver probe. Since nobody has cared about DMA Alias support,
leave that as it was but fix the fundamental iommu_device_probe() breakage.

Fixes: cdf315f907 ("iommu/arm-smmu-v3: Maintain a SID->device structure")
Cc: stable@vger.kernel.org
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/20250415185620.504299-1-nicolinc@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-09 09:39:42 +02:00
arch ARM: dts: opos6ul: add ksz8081 phy properties 2025-05-09 09:39:41 +02:00
block blk-iocost: do not WARN if iocg was already offlined 2025-05-02 07:44:22 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: null - Use spin lock instead of mutex 2025-05-02 07:44:34 +02:00
Documentation scsi: libsas: Delete lldd_clear_aca callback 2025-05-02 07:44:07 +02:00
drivers iommu/arm-smmu-v3: Fix iommu_device_probe bug due to duplicated stream ids 2025-05-09 09:39:42 +02:00
fs jfs: define xtree root and page independently 2025-05-02 07:44:39 +02:00
include xdp: Reset bpf_redirect_info before running a xdp's BPF prog. 2025-05-02 07:44:39 +02:00
init sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP 2025-05-02 07:44:36 +02:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:06:25 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel tracing: Fix oob write in trace_seq_to_buffer() 2025-05-09 09:39:37 +02:00
lib ubsan: Fix panic from test_ubsan_out_of_bounds 2025-05-02 07:44:38 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm: fix apply_to_existing_page_range() 2025-05-02 07:44:24 +02:00
net net: ipv6: fix UDPv6 GSO segmentation with NAT 2025-05-09 09:39:39 +02:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-03-13 12:49:57 +01:00
scripts selinux: Chain up tool resolving errors in install_policy.sh 2025-04-10 14:31:57 +02:00
security landlock: Add the errata interface 2025-05-02 07:44:20 +02:00
sound ALSA: usb-audio: Add second USB ID for Jabra Evolve 65 headset 2025-05-09 09:39:35 +02:00
tools selftests/mincore: Allow read-ahead pages to reach the end of the file 2025-05-02 07:44:37 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-10-22 15:40:41 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS trace: Relocate event helper files 2024-04-10 16:19:24 +02:00
Makefile Linux 5.15.181 2025-05-02 07:44:40 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.