From patchwork Wed Dec 20 01:23:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 13499420 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (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 1CDE41641D; Wed, 20 Dec 2023 01:28:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="FdLpV0Cl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703035735; x=1734571735; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2xoK4NT+bp82akQP6uCznFLbh9NDnUUFLLnz6ops994=; b=FdLpV0CldlESlwc81gtGSzgqVIwY3Gwttf8IqVcnt4ELCUEdkRaP5s7a zAiBL6CNh45ueK9ktr8yj9z5amVc9nrWzWZkAs62Cb5H6tR4ahbYCNPS6 hGC4SK9rkg8PNNhoj2dYtvris3dpuq/oFTQRLc10mbY3Jv50PiB7Z3g7Q anPuFDjNG3+RQAsTe0PgZUUfzR5WQUlg8GAiNETrWgPWWtGAISIRZhMrg +rtLE8gJJNiY/EgI4aNbTTCiMyhzeuY5HhUB9X9CmJhPXF4iHnFkC4QI0 QwnYIUrIQ9pC/544Sr1+z/Vo222oOT35nO5xgkA0ta8LhfzDcFAciDvwG w==; X-IronPort-AV: E=McAfee;i="6600,9927,10929"; a="2965794" X-IronPort-AV: E=Sophos;i="6.04,290,1695711600"; d="scan'208";a="2965794" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2023 17:28:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10929"; a="1023319114" X-IronPort-AV: E=Sophos;i="6.04,290,1695711600"; d="scan'208";a="1023319114" Received: from allen-box.sh.intel.com ([10.239.159.127]) by fmsmga006.fm.intel.com with ESMTP; 19 Dec 2023 17:28:51 -0800 From: Lu Baolu To: Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe , Kevin Tian , Jean-Philippe Brucker , Nicolin Chen Cc: Yi Liu , Jacob Pan , Longfang Liu , Yan Zhao , iommu@lists.linux.dev, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu , Jason Gunthorpe Subject: [PATCH v9 06/14] iommu: Remove iommu_[un]register_device_fault_handler() Date: Wed, 20 Dec 2023 09:23:24 +0800 Message-Id: <20231220012332.168188-7-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231220012332.168188-1-baolu.lu@linux.intel.com> References: <20231220012332.168188-1-baolu.lu@linux.intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The individual iommu driver reports the iommu page faults by calling iommu_report_device_fault(), where a pre-registered device fault handler is called to route the fault to another fault handler installed on the corresponding iommu domain. The pre-registered device fault handler is static and won't be dynamic as the fault handler is eventually per iommu domain. Replace calling device fault handler with iommu_queue_iopf(). After this replacement, the registering and unregistering fault handler interfaces are not needed anywhere. Remove the interfaces and the related data structures to avoid dead code. Convert cookie parameter of iommu_queue_iopf() into a device pointer that is really passed. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Tested-by: Yan Zhao Tested-by: Longfang Liu --- include/linux/iommu.h | 23 ------ drivers/iommu/iommu-sva.h | 4 +- .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 13 +--- drivers/iommu/intel/iommu.c | 24 ++---- drivers/iommu/io-pgfault.c | 6 +- drivers/iommu/iommu.c | 76 +------------------ 6 files changed, 13 insertions(+), 133 deletions(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5063e1025c85..3f4ea7ea2fb8 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -128,7 +128,6 @@ struct iommu_page_response { typedef int (*iommu_fault_handler_t)(struct iommu_domain *, struct device *, unsigned long, int, void *); -typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *); struct iommu_domain_geometry { dma_addr_t aperture_start; /* First address that can be mapped */ @@ -594,8 +593,6 @@ struct iommu_fault_event { /** * struct iommu_fault_param - per-device IOMMU fault data - * @handler: Callback function to handle IOMMU faults at device level - * @data: handler private data * @lock: protect pending faults list * @dev: the device that owns this param * @queue: IOPF queue @@ -605,8 +602,6 @@ struct iommu_fault_event { * @faults: holds the pending faults which need response */ struct iommu_fault_param { - iommu_dev_fault_handler_t handler; - void *data; struct mutex lock; struct device *dev; @@ -729,11 +724,6 @@ extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, extern struct iommu_group *iommu_group_get(struct device *dev); extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); extern void iommu_group_put(struct iommu_group *group); -extern int iommu_register_device_fault_handler(struct device *dev, - iommu_dev_fault_handler_t handler, - void *data); - -extern int iommu_unregister_device_fault_handler(struct device *dev); extern int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt); @@ -1145,19 +1135,6 @@ static inline void iommu_group_put(struct iommu_group *group) { } -static inline -int iommu_register_device_fault_handler(struct device *dev, - iommu_dev_fault_handler_t handler, - void *data) -{ - return -ENODEV; -} - -static inline int iommu_unregister_device_fault_handler(struct device *dev) -{ - return 0; -} - static inline int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) { diff --git a/drivers/iommu/iommu-sva.h b/drivers/iommu/iommu-sva.h index 54946b5a7caf..de7819c796ce 100644 --- a/drivers/iommu/iommu-sva.h +++ b/drivers/iommu/iommu-sva.h @@ -13,7 +13,7 @@ struct iommu_fault; struct iopf_queue; #ifdef CONFIG_IOMMU_SVA -int iommu_queue_iopf(struct iommu_fault *fault, void *cookie); +int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev); int iopf_queue_add_device(struct iopf_queue *queue, struct device *dev); int iopf_queue_remove_device(struct iopf_queue *queue, @@ -26,7 +26,7 @@ enum iommu_page_response_code iommu_sva_handle_iopf(struct iommu_fault *fault, void *data); #else /* CONFIG_IOMMU_SVA */ -static inline int iommu_queue_iopf(struct iommu_fault *fault, void *cookie) +static inline int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev) { return -ENODEV; } diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c index 05722121f00e..ab2b0a5e4369 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c @@ -487,7 +487,6 @@ bool arm_smmu_master_sva_enabled(struct arm_smmu_master *master) static int arm_smmu_master_sva_enable_iopf(struct arm_smmu_master *master) { - int ret; struct device *dev = master->dev; /* @@ -500,16 +499,7 @@ static int arm_smmu_master_sva_enable_iopf(struct arm_smmu_master *master) if (!master->iopf_enabled) return -EINVAL; - ret = iopf_queue_add_device(master->smmu->evtq.iopf, dev); - if (ret) - return ret; - - ret = iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev); - if (ret) { - iopf_queue_remove_device(master->smmu->evtq.iopf, dev); - return ret; - } - return 0; + return iopf_queue_add_device(master->smmu->evtq.iopf, dev); } static void arm_smmu_master_sva_disable_iopf(struct arm_smmu_master *master) @@ -519,7 +509,6 @@ static void arm_smmu_master_sva_disable_iopf(struct arm_smmu_master *master) if (!master->iopf_enabled) return; - iommu_unregister_device_fault_handler(dev); iopf_queue_remove_device(master->smmu->evtq.iopf, dev); } diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 6fb5f6fceea1..df6ceefc09ee 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4427,23 +4427,15 @@ static int intel_iommu_enable_iopf(struct device *dev) if (ret) return ret; - ret = iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev); - if (ret) - goto iopf_remove_device; - ret = pci_enable_pri(pdev, PRQ_DEPTH); - if (ret) - goto iopf_unregister_handler; + if (ret) { + iopf_queue_remove_device(iommu->iopf_queue, dev); + return ret; + } + info->pri_enabled = 1; return 0; - -iopf_unregister_handler: - iommu_unregister_device_fault_handler(dev); -iopf_remove_device: - iopf_queue_remove_device(iommu->iopf_queue, dev); - - return ret; } static int intel_iommu_disable_iopf(struct device *dev) @@ -4466,11 +4458,9 @@ static int intel_iommu_disable_iopf(struct device *dev) info->pri_enabled = 0; /* - * With PRI disabled and outstanding PRQs drained, unregistering - * fault handler and removing device from iopf queue should never - * fail. + * With PRI disabled and outstanding PRQs drained, removing device + * from iopf queue should never fail. */ - WARN_ON(iommu_unregister_device_fault_handler(dev)); WARN_ON(iopf_queue_remove_device(iommu->iopf_queue, dev)); return 0; diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c index f948303b2a91..4fda01de5589 100644 --- a/drivers/iommu/io-pgfault.c +++ b/drivers/iommu/io-pgfault.c @@ -87,7 +87,7 @@ static void iopf_handler(struct work_struct *work) /** * iommu_queue_iopf - IO Page Fault handler * @fault: fault event - * @cookie: struct device, passed to iommu_register_device_fault_handler. + * @dev: struct device. * * Add a fault to the device workqueue, to be handled by mm. * @@ -124,14 +124,12 @@ static void iopf_handler(struct work_struct *work) * * Return: 0 on success and <0 on error. */ -int iommu_queue_iopf(struct iommu_fault *fault, void *cookie) +int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev) { int ret; struct iopf_group *group; struct iopf_fault *iopf, *next; struct iommu_fault_param *iopf_param; - - struct device *dev = cookie; struct dev_iommu *param = dev->iommu; lockdep_assert_held(¶m->lock); diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index e8f2bcea7f51..bfa3c594542c 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1330,76 +1330,6 @@ void iommu_group_put(struct iommu_group *group) } EXPORT_SYMBOL_GPL(iommu_group_put); -/** - * iommu_register_device_fault_handler() - Register a device fault handler - * @dev: the device - * @handler: the fault handler - * @data: private data passed as argument to the handler - * - * When an IOMMU fault event is received, this handler gets called with the - * fault event and data as argument. The handler should return 0 on success. If - * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also - * complete the fault by calling iommu_page_response() with one of the following - * response code: - * - IOMMU_PAGE_RESP_SUCCESS: retry the translation - * - IOMMU_PAGE_RESP_INVALID: terminate the fault - * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting - * page faults if possible. - * - * Return 0 if the fault handler was installed successfully, or an error. - */ -int iommu_register_device_fault_handler(struct device *dev, - iommu_dev_fault_handler_t handler, - void *data) -{ - struct dev_iommu *param = dev->iommu; - int ret = 0; - - if (!param || !param->fault_param) - return -EINVAL; - - mutex_lock(¶m->lock); - /* Only allow one fault handler registered for each device */ - if (param->fault_param->handler) { - ret = -EBUSY; - goto done_unlock; - } - - param->fault_param->handler = handler; - param->fault_param->data = data; - -done_unlock: - mutex_unlock(¶m->lock); - - return ret; -} -EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); - -/** - * iommu_unregister_device_fault_handler() - Unregister the device fault handler - * @dev: the device - * - * Remove the device fault handler installed with - * iommu_register_device_fault_handler(). - * - * Return 0 on success, or an error. - */ -int iommu_unregister_device_fault_handler(struct device *dev) -{ - struct dev_iommu *param = dev->iommu; - - if (!param || !param->fault_param) - return -EINVAL; - - mutex_lock(¶m->lock); - param->fault_param->handler = NULL; - param->fault_param->data = NULL; - mutex_unlock(¶m->lock); - - return 0; -} -EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); - /** * iommu_report_device_fault() - Report fault event to device driver * @dev: the device @@ -1424,10 +1354,6 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) /* we only report device fault if there is a handler registered */ mutex_lock(¶m->lock); fparam = param->fault_param; - if (!fparam || !fparam->handler) { - ret = -EINVAL; - goto done_unlock; - } if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { @@ -1442,7 +1368,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) mutex_unlock(&fparam->lock); } - ret = fparam->handler(&evt->fault, fparam->data); + ret = iommu_queue_iopf(&evt->fault, dev); if (ret && evt_pending) { mutex_lock(&fparam->lock); list_del(&evt_pending->list);