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From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
	"iommu@lists.linux-foundation.org"
	<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>,
	Rafael Wysocki <rafael.j.wysocki@intel.com>,
	Alex Williamson <alex.williamson@redhat.com>
Cc: Lan Tianyu <tianyu.lan@intel.com>,
	Yi L <yi.l.liu@linux.intel.com>,
	"Liu@mail.linuxfoundation.org" <Liu@mail.linuxfoundation.org>
Subject: Re: [PATCH v3 08/16] iommu: introduce device fault data
Date: Wed, 10 Jan 2018 11:41:58 +0000	[thread overview]
Message-ID: <f9f9dd55-3191-eba0-f4e7-e7c9f16c00f1@arm.com> (raw)
In-Reply-To: <1510944914-54430-9-git-send-email-jacob.jun.pan@linux.intel.com>

Hi Jacob,

On 17/11/17 18:55, Jacob Pan wrote:
[...]
> +/**
> + * struct iommu_fault_event - Generic per device fault data
> + *
> + * - PCI and non-PCI devices
> + * - Recoverable faults (e.g. page request), information based on PCI ATS
> + * and PASID spec.
> + * - Un-recoverable faults of device interest
> + * - DMA remapping and IRQ remapping faults
> +
> + * @type contains fault type.
> + * @reason fault reasons if relevant outside IOMMU driver, IOMMU driver internal
> + *         faults are not reported
> + * @addr: tells the offending page address
> + * @pasid: contains process address space ID, used in shared virtual memory(SVM)
> + * @rid: requestor ID
> + * @page_req_group_id: page request group index
> + * @last_req: last request in a page request group
> + * @pasid_valid: indicates if the PRQ has a valid PASID
> + * @prot: page access protection flag, e.g. IOMMU_FAULT_READ, IOMMU_FAULT_WRITE
> + * @device_private: if present, uniquely identify device-specific
> + *                  private data for an individual page request.
> + * @iommu_private: used by the IOMMU driver for storing fault-specific
> + *                 data. Users should not modify this field before
> + *                 sending the fault response.
> + */
> +struct iommu_fault_event {
> +	enum iommu_fault_type type;
> +	enum iommu_fault_reason reason;
> +	u64 addr;
> +	u32 pasid;
> +	u32 page_req_group_id : 9;

As I've been rebasing my work onto your series, I have a few more comments
about this structure. Is there any advantage in limiting the PRGI as a
bitfield? PCI uses 9 bits, but others might need more. For instance ARM
Stall uses 16-bit IDs to identify a fault event.

Could you please make it a u32 (as well as in page_response_msg), and
could page_req_group_id be renamed to simply "id"?

> +	u32 last_req : 1;
> +	u32 pasid_valid : 1;
I noticed that page_response_msg in patch 15/16 calls this bit
"pasid_present". Could you rename it to "pasid_valid" for consistency?

Thanks,
Jean

  parent reply	other threads:[~2018-01-10 11:39 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-17 18:54 [PATCH v3 00/16] [PATCH v3 00/16] IOMMU driver support for SVM virtualization Jacob Pan
2017-11-17 18:54 ` [PATCH v3 01/16] iommu: introduce bind_pasid_table API function Jacob Pan
2017-11-24 12:04   ` Jean-Philippe Brucker
2017-11-29 22:01     ` Jacob Pan
2017-11-17 18:55 ` [PATCH v3 02/16] iommu/vt-d: add bind_pasid_table function Jacob Pan
2017-11-17 18:55 ` [PATCH v3 03/16] iommu: introduce iommu invalidate API function Jacob Pan
2017-11-24 12:04   ` Jean-Philippe Brucker
2017-12-15 19:02     ` Jean-Philippe Brucker
2017-12-28 19:25     ` Jacob Pan
2018-01-10 12:00       ` Jean-Philippe Brucker
2017-11-17 18:55 ` [PATCH v3 04/16] iommu/vt-d: move device_domain_info to header Jacob Pan
2017-11-17 18:55 ` [PATCH v3 05/16] iommu/vt-d: support flushing more TLB types Jacob Pan
2017-11-20 14:20   ` Lukoshkov, Maksim
2017-11-20 18:40     ` Jacob Pan
2017-11-17 18:55 ` [PATCH v3 06/16] iommu/vt-d: add svm/sva invalidate function Jacob Pan
2017-12-05  5:43   ` Lu Baolu
2017-11-17 18:55 ` [PATCH v3 07/16] iommu/vt-d: assign PFSID in device TLB invalidation Jacob Pan
2017-12-05  5:45   ` Lu Baolu
2017-11-17 18:55 ` [PATCH v3 08/16] iommu: introduce device fault data Jacob Pan
2017-11-24 12:03   ` Jean-Philippe Brucker
2017-11-29 21:55     ` Jacob Pan
2018-01-10 11:41   ` Jean-Philippe Brucker [this message]
2018-01-11 21:10     ` Jacob Pan
2017-11-17 18:55 ` [PATCH v3 09/16] driver core: add iommu device fault reporting data Jacob Pan
2017-12-18 14:37   ` Greg Kroah-Hartman
2017-11-17 18:55 ` [PATCH v3 10/16] iommu: introduce device fault report API Jacob Pan
2017-12-05  6:22   ` Lu Baolu
2017-12-08 21:22     ` Jacob Pan
2017-12-07 21:27   ` Alex Williamson
2017-12-08 20:23     ` Jacob Pan
2017-12-08 20:59       ` Alex Williamson
2017-12-08 21:22         ` Jacob Pan
2018-01-10 12:39   ` Jean-Philippe Brucker
2018-01-18 19:24   ` Jean-Philippe Brucker
2018-01-23 20:01     ` Jacob Pan
2017-11-17 18:55 ` [PATCH v3 11/16] iommu/vt-d: use threaded irq for dmar_fault Jacob Pan
2017-11-17 18:55 ` [PATCH v3 12/16] iommu/vt-d: report unrecoverable device faults Jacob Pan
2017-12-05  6:34   ` Lu Baolu
2017-11-17 18:55 ` [PATCH v3 13/16] iommu/intel-svm: notify page request to guest Jacob Pan
2017-12-05  7:37   ` Lu Baolu
2017-11-17 18:55 ` [PATCH v3 14/16] iommu/intel-svm: replace dev ops with fault report API Jacob Pan
2017-11-17 18:55 ` [PATCH v3 15/16] iommu: introduce page response function Jacob Pan
2017-11-24 12:03   ` Jean-Philippe Brucker
2017-12-04 21:37     ` Jacob Pan
2017-12-05 17:21       ` Jean-Philippe Brucker
2017-12-06 19:25         ` Jacob Pan
2017-12-07 12:56           ` Jean-Philippe Brucker
2017-12-07 21:56             ` Alex Williamson
2017-12-08 13:51               ` Jean-Philippe Brucker
2017-12-08  1:17             ` Jacob Pan
2017-12-08 13:51               ` Jean-Philippe Brucker
2017-12-07 21:51           ` Alex Williamson
2017-12-08 13:52             ` Jean-Philippe Brucker
2017-12-08 20:40               ` Jacob Pan
2017-12-08 23:01                 ` Alex Williamson
2017-11-17 18:55 ` [PATCH v3 16/16] iommu/vt-d: add intel iommu " Jacob Pan

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