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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
	iommu@lists.linux-foundation.org,
	LKML <linux-kernel@vger.kernel.org>,
	Joerg Roedel <joro@8bytes.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>,
	"Liu, Yi L" <yi.l.liu@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Jean Delvare <khali@linux-fr.org>,
	Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v5 07/23] iommu/vt-d: fix dev iotlb pfsid use
Date: Mon, 14 May 2018 09:52:04 +0800	[thread overview]
Message-ID: <5AF8EBC4.4040104@linux.intel.com> (raw)
In-Reply-To: <1526072055-86990-8-git-send-email-jacob.jun.pan@linux.intel.com>

Hi,

On 05/12/2018 04:53 AM, Jacob Pan wrote:
> PFSID should be used in the invalidation descriptor for flushing
> device IOTLBs on SRIOV VFs.

This patch could be submitted separately.

>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
>  drivers/iommu/dmar.c        |  6 +++---
>  drivers/iommu/intel-iommu.c | 16 +++++++++++++++-
>  include/linux/intel-iommu.h |  5 ++---
>  3 files changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 460bed4..7852678 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1339,8 +1339,8 @@ void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
>  	qi_submit_sync(&desc, iommu);
>  }
>  
> -void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
> -			u64 addr, unsigned mask)
> +void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> +			u16 qdep, u64 addr, unsigned mask)
>  {
>  	struct qi_desc desc;
>  
> @@ -1355,7 +1355,7 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
>  		qdep = 0;
>  
>  	desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) |
> -		   QI_DIOTLB_TYPE;
> +		   QI_DIOTLB_TYPE | QI_DEV_IOTLB_PFSID(pfsid);
>  
>  	qi_submit_sync(&desc, iommu);
>  }
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 4623294..732a10f 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -1459,6 +1459,19 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info)
>  		return;
>  
>  	pdev = to_pci_dev(info->dev);
> +	/* For IOMMU that supports device IOTLB throttling (DIT), we assign
> +	 * PFSID to the invalidation desc of a VF such that IOMMU HW can gauge
> +	 * queue depth at PF level. If DIT is not set, PFSID will be treated as
> +	 * reserved, which should be set to 0.
> +	 */
> +	if (!ecap_dit(info->iommu->ecap))
> +		info->pfsid = 0;
> +	else if (pdev && pdev->is_virtfn) {
> +		if (ecap_dit(info->iommu->ecap))
> +			dev_warn(&pdev->dev, "SRIOV VF device IOTLB enabled without flow control\n");

I can't understand these two lines.

Isn't the condition always true? What does the error message mean?

> +		info->pfsid = PCI_DEVID(pdev->physfn->bus->number, pdev->physfn->devfn);
> +	} else
> +		info->pfsid = PCI_DEVID(info->bus, info->devfn);
>  
>  #ifdef CONFIG_INTEL_IOMMU_SVM
>  	/* The PCIe spec, in its wisdom, declares that the behaviour of
> @@ -1524,7 +1537,8 @@ static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
>  
>  		sid = info->bus << 8 | info->devfn;
>  		qdep = info->ats_qdep;
> -		qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
> +		qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
> +				qdep, addr, mask);

Alignment should match open parenthesis.

>  	}
>  	spin_unlock_irqrestore(&device_domain_lock, flags);
>  }
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index dfacd49..678a0f4 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -504,9 +504,8 @@ extern void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid,
>  			     u8 fm, u64 type);
>  extern void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
>  			  unsigned int size_order, u64 type);
> -extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
> -			       u64 addr, unsigned mask);
> -
> +extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> +			u16 qdep, u64 addr, unsigned mask);

Alignment should match open parenthesis.

>  extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);
>  
>  extern int dmar_ir_support(void);

Best regards,
Lu Baolu

  reply	other threads:[~2018-05-14  1:52 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 20:53 [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual Address (SVA) Jacob Pan
2018-05-11 20:53 ` [PATCH v5 01/23] iommu: introduce bind_pasid_table API function Jacob Pan
2018-08-23 16:34   ` Auger Eric
2018-08-24 12:47     ` Liu, Yi L
2018-08-24 13:20       ` Auger Eric
2018-08-28 17:04         ` Jacob Pan
2018-08-24 15:00   ` Auger Eric
2018-08-28  5:14     ` Jacob Pan
2018-08-28  8:34       ` Auger Eric
2018-08-28 16:36         ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 02/23] iommu/vt-d: move device_domain_info to header Jacob Pan
2018-05-11 20:53 ` [PATCH v5 03/23] iommu/vt-d: add a flag for pasid table bound status Jacob Pan
2018-05-13  7:33   ` Lu Baolu
2018-05-14 18:51     ` Jacob Pan
2018-05-13  8:01   ` Lu Baolu
2018-05-14 18:52     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 04/23] iommu/vt-d: add bind_pasid_table function Jacob Pan
2018-05-13  9:29   ` Lu Baolu
2018-05-14 20:22     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 05/23] iommu: introduce iommu invalidate API function Jacob Pan
2018-05-11 20:53 ` [PATCH v5 06/23] iommu/vt-d: add definitions for PFSID Jacob Pan
2018-05-14  1:36   ` Lu Baolu
2018-05-14 20:30     ` Jacob Pan
2018-05-11 20:53 ` [PATCH v5 07/23] iommu/vt-d: fix dev iotlb pfsid use Jacob Pan
2018-05-14  1:52   ` Lu Baolu [this message]
2018-05-14 20:38     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 08/23] iommu/vt-d: support flushing more translation cache types Jacob Pan
2018-05-14  2:18   ` Lu Baolu
2018-05-14 20:46     ` Jacob Pan
2018-05-17  8:44   ` kbuild test robot
2018-05-11 20:54 ` [PATCH v5 09/23] iommu/vt-d: add svm/sva invalidate function Jacob Pan
2018-05-14  3:35   ` Lu Baolu
2018-05-14 20:49     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 10/23] iommu: introduce device fault data Jacob Pan
2018-09-21 10:07   ` Auger Eric
2018-09-21 17:05     ` Jacob Pan
2018-09-26 10:20       ` Auger Eric
2018-05-11 20:54 ` [PATCH v5 11/23] driver core: add per device iommu param Jacob Pan
2018-05-14  5:27   ` Lu Baolu
2018-05-14 20:52     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 12/23] iommu: add a timeout parameter for prq response Jacob Pan
2018-05-11 20:54 ` [PATCH v5 13/23] iommu: introduce device fault report API Jacob Pan
2018-05-14  6:01   ` Lu Baolu
2018-05-14 20:55     ` Jacob Pan
2018-05-15  6:52       ` Lu Baolu
2018-05-17 11:41   ` Liu, Yi L
2018-05-17 15:59     ` Jacob Pan
2018-05-17 23:22       ` Liu, Yi L
2018-05-21 23:03         ` Jacob Pan
2018-09-06  9:25   ` Auger Eric
2018-09-06 12:42     ` Jean-Philippe Brucker
2018-09-06 13:14       ` Auger Eric
2018-09-06 17:06         ` Jean-Philippe Brucker
2018-09-07  7:11           ` Auger Eric
2018-09-07 11:23             ` Jean-Philippe Brucker
2018-09-14 13:24   ` Auger Eric
2018-09-17 16:57     ` Jacob Pan
2018-09-25 14:58   ` Jean-Philippe Brucker
2018-09-25 22:17     ` Jacob Pan
2018-09-26 10:14       ` Jean-Philippe Brucker
2018-05-11 20:54 ` [PATCH v5 14/23] iommu: introduce page response function Jacob Pan
2018-05-14  6:39   ` Lu Baolu
2018-05-29 16:13     ` Jacob Pan
2018-09-10 14:52   ` Auger Eric
2018-09-10 17:50     ` Jacob Pan
2018-09-10 19:06       ` Auger Eric
2018-05-11 20:54 ` [PATCH v5 15/23] iommu: handle page response timeout Jacob Pan
2018-05-14  7:43   ` Lu Baolu
2018-05-29 16:20     ` Jacob Pan
2018-05-30  7:46       ` Lu Baolu
2018-05-11 20:54 ` [PATCH v5 16/23] iommu/config: add build dependency for dmar Jacob Pan
2018-05-11 20:54 ` [PATCH v5 17/23] iommu/vt-d: report non-recoverable faults to device Jacob Pan
2018-05-14  8:17   ` Lu Baolu
2018-05-29 17:33     ` Jacob Pan
2018-05-11 20:54 ` [PATCH v5 18/23] iommu/intel-svm: report device page request Jacob Pan
2018-05-11 20:54 ` [PATCH v5 19/23] iommu/intel-svm: replace dev ops with fault report API Jacob Pan
2018-05-11 20:54 ` [PATCH v5 20/23] iommu/intel-svm: do not flush iotlb for viommu Jacob Pan
2018-05-11 20:54 ` [PATCH v5 21/23] iommu/vt-d: add intel iommu page response function Jacob Pan
2018-05-11 20:54 ` [PATCH v5 22/23] trace/iommu: add sva trace events Jacob Pan
2018-05-11 20:54 ` [PATCH v5 23/23] iommu: use sva invalidate and device fault trace event Jacob Pan
2018-05-29 15:54 ` [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual Address (SVA) Jacob Pan

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