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[86.49.241.13]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2080cc3835sm85483366b.44.2026.08.07.11.17.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 11:17:31 -0700 (PDT) From: Andrew Jones To: linux-riscv@lists.infradead.org, iommu@lists.linux.dev Cc: linux-kernel@vger.kernel.org, tomasz.jeznach@linux.dev, tjeznach@rivosinc.com, jgg@ziepe.ca, jgg@nvidia.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, anup@brainfault.org, tglx@kernel.org, kevin.tian@intel.com, fangyu.yu@linux.alibaba.com Subject: [PATCH v3 08/19] iommu/riscv: Prepare info->domain for concurrent RCU read access Date: Fri, 7 Aug 2026 20:17:02 +0200 Message-ID: <20260807181713.228535-9-andrew.jones@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260807181713.228535-1-andrew.jones@oss.qualcomm.com> References: <20260807181713.228535-1-andrew.jones@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=Cb44Irrl c=1 sm=1 tr=0 ts=6a76213e cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=VPysOpcHbS0DNrM1Xqmyow==:17 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=j3M2sUOd0rYxyD8OH6gA:9 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-GUID: DkNcKVPUe_Hejx25_xYyUxnJElqyJnbP X-Proofpoint-ORIG-GUID: DkNcKVPUe_Hejx25_xYyUxnJElqyJnbP X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA3MDE0MyBTYWx0ZWRfX1BYH42TV5MXL fT1aZoIRkSey3+Ruc5t3TFg8s+6F8GV0ZaA0ZFMkw5XBspumH7/7ozvLL9yz02VdPm+Vso18/YJ oq7gMwwzgYLf4zhZfUugL7z4bVBQFdmWIWbs8L7hoKg9goJx7p1Ua7tYHLB1q9wTQRC8cDXbCMf wYYI0xZjs/5LN13rflsqa4sq9cU2AVubia6fGwc0fp7HE/74eK3sm14aXz4BIlM8q3mWooDnC+f DfLATVdpEdXydH5azdHNYmKaMaTIY3tkkeTbSLGdUuGo/OUqiJdeL2+XSFnZV26tJOVL2rj2VfZ +Nou/ZKQEfCpInz0ENRvLzEUgiI2bd7bj/M6rPUUrNG823nGvVczecmoZJb42szndooilgVBTLb HIosctNztXY3ynO/QyK/y7mwMCsuJYUNixM6fmyx7HLIu/eJuKRAF6ylRMsIUBaZHbFfSQ7Wtex 6UkZJJ7BtKrsLXNjp+Q== X-Proofpoint-Spam-Info: AW1haW4tMjYwODA3MDE0MyBTYWx0ZWRfXwCu3THIYSqfH BytPTqIxhONQBXTfjHZ59mGW0Tez6rXCuyJLL1rTOPsm8ZpyWRpRRiPMdNtK2F+WwvsHb7W6KLN nJiDAuwtwlRaq79w4TE4Veo9BxnTHnY= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-07_03,2026-08-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 malwarescore=0 suspectscore=0 bulkscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608070143 An upcoming compose_msi_msg() implementation reads info->domain from potentially atomic context, concurrent with domain switches. Apply RCU in preparation. Signed-off-by: Andrew Jones --- drivers/iommu/riscv/iommu.c | 14 ++++++++------ drivers/iommu/riscv/iommu.h | 3 ++- 2 files changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index bfe606a0cb9a..27dfd60834ac 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -1241,6 +1241,8 @@ static void riscv_iommu_free_paging_domain(struct iommu_domain *iommu_domain) WARN_ON(!list_empty(&domain->bonds)); + synchronize_rcu(); + riscv_iommu_ir_free_paging_domain(iommu_domain); if ((int)domain->pscid > 0) @@ -1296,8 +1298,8 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain, } riscv_iommu_iodir_update(iommu, dev, fsc, ta); - riscv_iommu_bond_unlink(info->domain, dev); - info->domain = domain; + riscv_iommu_bond_unlink(rcu_access_pointer(info->domain), dev); + rcu_assign_pointer(info->domain, domain); return 0; } @@ -1373,8 +1375,8 @@ static int riscv_iommu_attach_blocking_domain(struct iommu_domain *iommu_domain, /* Make device context invalid, translation requests will fault w/ #258 */ riscv_iommu_iodir_update(iommu, dev, RISCV_IOMMU_FSC_BARE, 0); - riscv_iommu_bond_unlink(info->domain, dev); - info->domain = NULL; + riscv_iommu_bond_unlink(rcu_access_pointer(info->domain), dev); + rcu_assign_pointer(info->domain, NULL); return 0; } @@ -1394,8 +1396,8 @@ static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain, struct riscv_iommu_info *info = dev_iommu_priv_get(dev); riscv_iommu_iodir_update(iommu, dev, RISCV_IOMMU_FSC_BARE, RISCV_IOMMU_PC_TA_V); - riscv_iommu_bond_unlink(info->domain, dev); - info->domain = NULL; + riscv_iommu_bond_unlink(rcu_access_pointer(info->domain), dev); + rcu_assign_pointer(info->domain, NULL); return 0; } diff --git a/drivers/iommu/riscv/iommu.h b/drivers/iommu/riscv/iommu.h index 5d83537911b6..ded18aec8010 100644 --- a/drivers/iommu/riscv/iommu.h +++ b/drivers/iommu/riscv/iommu.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include "iommu-bits.h" @@ -33,7 +34,7 @@ PT_IOMMU_CHECK_DOMAIN(struct riscv_iommu_domain, riscvpt.iommu, domain); /* Private IOMMU data for managed devices, dev_iommu_priv_* */ struct riscv_iommu_info { - struct riscv_iommu_domain *domain; + struct riscv_iommu_domain __rcu *domain; struct irq_domain *irqdomain; }; -- 2.43.0