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Sat, 07 Feb 2026 22:39:00 -0800 (PST) From: Zong Li To: tjeznach@rivosinc.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, robh@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, mark.rutland@arm.com, conor+dt@kernel.org, krzk@kernel.org, guoyaxing@bosc.ac.cn, luxu.kernel@bytedance.com, lv.zheng@linux.spacemit.com, andrew.jones@oss.qualcomm.com, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-riscv@lists.infradead.org, linux-perf-users@vger.kernel.org Cc: Zong Li , Samuel Holland Subject: [PATCH v2 2/2] iommu/riscv: create a auxiliary device for HPM Date: Sat, 7 Feb 2026 22:38:36 -0800 Message-ID: <20260208063848.3547817-3-zong.li@sifive.com> X-Mailer: git-send-email @GIT_VERSION@ In-Reply-To: <20260208063848.3547817-1-zong.li@sifive.com> References: <20260208063848.3547817-1-zong.li@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Create an auxiliary device for HPM when the IOMMU supports a hardware performance monitor. Suggested-by: Samuel Holland Signed-off-by: Zong Li --- drivers/iommu/riscv/iommu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index d9429097a2b5..7cdb80d4343d 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -14,6 +14,7 @@ =20 #include #include +#include #include #include #include @@ -559,6 +560,22 @@ static irqreturn_t riscv_iommu_fltq_process(int irq, v= oid *data) return IRQ_HANDLED; } =20 +/* + * IOMMU Hardware performance monitor + */ +static int riscv_iommu_hpm_enable(struct riscv_iommu_device *iommu) +{ + struct auxiliary_device *auxdev; + + /* TODO: for custom event support, the modname should come from compatibl= e */ + auxdev =3D __devm_auxiliary_device_create(iommu->dev, KBUILD_MODNAME, + "pmu", iommu, 0); + if (!auxdev) + return -ENODEV; + + return 0; +} + /* Lookup and initialize device context info structure. */ static struct riscv_iommu_dc *riscv_iommu_get_dc(struct riscv_iommu_device= *iommu, unsigned int devid) @@ -1669,6 +1686,9 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu) goto err_remove_sysfs; } =20 + if (iommu->caps & RISCV_IOMMU_CAPABILITIES_HPM) + riscv_iommu_hpm_enable(iommu); + return 0; =20 err_remove_sysfs: --=20 2.43.7