From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
Eric Auger <eric.auger@redhat.com>
Cc: yi.l.liu@linux.intel.com, kevin.tian@intel.com,
vincent.stehle@arm.com, alex.williamson@redhat.com,
ashok.raj@intel.com, kvm@vger.kernel.org,
peter.maydell@linaro.org, will.deacon@arm.com,
linux-kernel@vger.kernel.org, christoffer.dall@arm.com,
marc.zyngier@arm.com, iommu@lists.linux-foundation.org,
robin.murphy@arm.com, kvmarm@lists.cs.columbia.edu,
eric.auger.pro@gmail.com
Subject: Re: [PATCH v6 05/22] iommu: Introduce cache_invalidate API
Date: Wed, 20 Mar 2019 16:50:07 +0000 [thread overview]
Message-ID: <7ae1df77-18d0-0993-8dab-6af3a4474b42@arm.com> (raw)
In-Reply-To: <20190320093727.45a86866@jacob-builder>
On 20/03/2019 16:37, Jacob Pan wrote:
[...]
>> +struct iommu_inv_addr_info {
>> +#define IOMMU_INV_ADDR_FLAGS_PASID (1 << 0)
>> +#define IOMMU_INV_ADDR_FLAGS_ARCHID (1 << 1)
>> +#define IOMMU_INV_ADDR_FLAGS_LEAF (1 << 2)
>> + __u32 flags;
>> + __u32 archid;
>> + __u64 pasid;
>> + __u64 addr;
>> + __u64 granule_size;
>> + __u64 nb_granules;
>> +};
>> +
>> +/**
>> + * First level/stage invalidation information
>> + * @cache: bitfield that allows to select which caches to invalidate
>> + * @granularity: defines the lowest granularity used for the
>> invalidation:
>> + * domain > pasid > addr
>> + *
>> + * Not all the combinations of cache/granularity make sense:
>> + *
>> + * type | DEV_IOTLB | IOTLB | PASID |
>> + * granularity | | |
>> cache |
>> + * -------------+---------------+---------------+---------------+
>> + * DOMAIN | N/A | Y |
>> Y |
>> + * PASID | Y | Y |
>> Y |
>> + * ADDR | Y | Y |
>> N/A |
>> + */
>> +struct iommu_cache_invalidate_info {
>> +#define IOMMU_CACHE_INVALIDATE_INFO_VERSION_1 1
>> + __u32 version;
>> +/* IOMMU paging structure cache */
>> +#define IOMMU_CACHE_INV_TYPE_IOTLB (1 << 0) /* IOMMU IOTLB */
>> +#define IOMMU_CACHE_INV_TYPE_DEV_IOTLB (1 << 1) /* Device
>> IOTLB */ +#define IOMMU_CACHE_INV_TYPE_PASID (1 << 2) /* PASID
>> cache */
> Just a clarification, this used to be an enum. You do intend to issue a
> single invalidation request on multiple cache types? Perhaps for
> virtio-IOMMU? I only see a single cache type in your patch #14. For VT-d
> we plan to issue one cache type at a time for now. So this format works
> for us.
Yes for virtio-iommu I'd like as little overhead as possible, which
means a single invalidation message to hit both IOTLB and ATC at once,
and the ability to specify multiple pages with @nb_granules.
> However, if multiple cache types are issued in a single invalidation.
> They must share a single granularity, not all combinations are valid.
> e.g. dev IOTLB does not support domain granularity. Just a reminder,
> not an issue. Driver could filter out invalid combinations.
Agreed. Even the core could filter out invalid combinations based on the
table above: IOTLB and domain granularity are N/A.
Thanks,
Jean
>
>> + __u8 cache;
>> + __u8 granularity;
>> + __u8 padding[2];
>> + union {
>> + __u64 pasid;
>> + struct iommu_inv_addr_info addr_info;
>> + };
>> +};
>> +
>> +
>> #endif /* _UAPI_IOMMU_H */
>
> [Jacob Pan]
> _______________________________________________
> iommu mailing list
> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu
>
next prev parent reply other threads:[~2019-03-20 16:50 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-17 17:22 [PATCH v6 00/22] SMMUv3 Nested Stage Setup Eric Auger
2019-03-17 17:22 ` [PATCH v6 01/22] driver core: add per device iommu param Eric Auger
2019-03-17 17:22 ` [PATCH v6 02/22] iommu: introduce device fault data Eric Auger
2019-03-21 22:04 ` Jacob Pan
2019-03-22 8:00 ` Auger Eric
2019-03-17 17:22 ` [PATCH v6 03/22] iommu: introduce device fault report API Eric Auger
2019-03-21 20:57 ` Alex Williamson
2019-03-17 17:22 ` [PATCH v6 04/22] iommu: Introduce attach/detach_pasid_table API Eric Auger
2019-03-17 17:22 ` [PATCH v6 05/22] iommu: Introduce cache_invalidate API Eric Auger
2019-03-20 16:37 ` Jacob Pan
2019-03-20 16:50 ` Jean-Philippe Brucker [this message]
2019-03-21 13:54 ` Auger Eric
2019-03-21 14:13 ` Jean-Philippe Brucker
2019-03-21 14:32 ` Auger Eric
2019-03-21 22:10 ` Jacob Pan
2019-03-22 7:58 ` Auger Eric
2019-03-17 17:22 ` [PATCH v6 06/22] iommu: Introduce bind/unbind_guest_msi Eric Auger
2019-03-17 17:22 ` [PATCH v6 07/22] vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE Eric Auger
2019-03-21 22:19 ` Alex Williamson
2019-03-22 7:58 ` Auger Eric
2019-03-17 17:22 ` [PATCH v6 08/22] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2019-03-21 22:43 ` Alex Williamson
2019-03-17 17:22 ` [PATCH v6 09/22] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Eric Auger
2019-03-21 23:01 ` Alex Williamson
2019-03-22 9:30 ` Auger Eric
2019-03-22 22:09 ` Alex Williamson
2019-04-03 14:30 ` Auger Eric
2019-04-03 17:38 ` Alex Williamson
2019-04-04 6:55 ` Auger Eric
2019-04-10 12:35 ` Vincent Stehlé
2019-04-10 13:02 ` Auger Eric
2019-04-10 13:15 ` Marc Zyngier
2019-03-17 17:22 ` [PATCH v6 10/22] iommu/arm-smmu-v3: Link domains and devices Eric Auger
2019-03-17 17:22 ` [PATCH v6 11/22] iommu/arm-smmu-v3: Maintain a SID->device structure Eric Auger
2019-03-17 17:22 ` [PATCH v6 12/22] iommu/smmuv3: Get prepared for nested stage support Eric Auger
2019-03-17 17:22 ` [PATCH v6 13/22] iommu/smmuv3: Implement attach/detach_pasid_table Eric Auger
2019-03-17 17:22 ` [PATCH v6 14/22] iommu/smmuv3: Implement cache_invalidate Eric Auger
2019-03-17 17:22 ` [PATCH v6 15/22] dma-iommu: Implement NESTED_MSI cookie Eric Auger
2019-03-17 17:22 ` [PATCH v6 16/22] iommu/smmuv3: Implement bind/unbind_guest_msi Eric Auger
2019-03-17 17:22 ` [PATCH v6 17/22] iommu/smmuv3: Report non recoverable faults Eric Auger
2019-03-17 17:22 ` [PATCH v6 18/22] vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type Eric Auger
2019-03-17 17:22 ` [PATCH v6 19/22] vfio-pci: Register an iommu fault handler Eric Auger
2019-03-17 17:22 ` [PATCH v6 20/22] vfio_pci: Allow to mmap the fault queue Eric Auger
2019-03-17 17:22 ` [PATCH v6 21/22] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Eric Auger
2019-03-17 17:22 ` [PATCH v6 22/22] vfio: Document nested stage control Eric Auger
2019-03-22 13:27 ` [PATCH v6 00/22] SMMUv3 Nested Stage Setup Auger Eric
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