From: Robin Murphy <robin.murphy@arm.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Gerd Bayer <gbayer@linux.ibm.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Wenjia Zhang <wenjia@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
svens@linux.ibm.com, linux-kernel@vger.kernel.org,
Julian Ruess <julianr@linux.ibm.com>
Subject: Re: [PATCH v2 4/7] iommu: Let iommu.strict override ops->def_domain_type
Date: Tue, 29 Nov 2022 18:41:22 +0000 [thread overview]
Message-ID: <eb30ad63-92d4-2af4-22e7-d82cdf08565e@arm.com> (raw)
In-Reply-To: <Y4ZCVgLO9AHatwXe@nvidia.com>
On 2022-11-29 17:33, Jason Gunthorpe wrote:
> On Mon, Nov 28, 2022 at 09:01:43PM +0000, Robin Murphy wrote:
>
>> I'm hardly an advocate for trying to save users from themselves, but I
>> honestly can't see any justifiable reason for not having sysfs respect
>> iommu_get_def_domain_type().
>
> We really need to rename this value if it is not actually just an
> advisory "default" but a functional requirement ..
It represents a required default domain type. As in, the type for the
device's default domain. Not the default type for a domain. It's the
iommu_def_domain_type variable that holds the *default* default domain
type ;)
Which reminds me I should finish that patch undoing my terrible
ops->default_domain_ops idea, not least because they are misleadingly
unrelated to default domains...
>>> The driver should have no say in how dma-iommu.c works beyond if it
>>> provides the required ops functionalities, and hint(s) as to what
>>> gives best performance.
>>
>> That should already be the case today, as outlined in my other mail. It's
>> just somewhat more evolved than designed, so may not be so clear to
>> everyone.
>
> It is close to being clear, once we get the last touches of dma-iommu
> stuff out of the drivers it should be quite clear
Cool, some upheaval of .domain_alloc is next on my hitlist anyway, so
that might be a good excuse to upheave it a bit more and streamline the
type stuff along the way.
Cheers,
Robin.
next prev parent reply other threads:[~2022-11-29 18:41 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-16 17:16 [PATCH v2 0/7] iommu/dma: s390 DMA API conversion and optimized IOTLB flushing Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 1/7] s390/ism: Set DMA coherent mask Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 2/7] s390/pci: prepare is_passed_through() for dma-iommu Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 3/7] s390/pci: Use dma-iommu layer Niklas Schnelle
2022-11-28 18:03 ` Robin Murphy
2022-12-19 15:17 ` Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 4/7] iommu: Let iommu.strict override ops->def_domain_type Niklas Schnelle
2022-11-17 1:55 ` Baolu Lu
2022-11-28 11:10 ` Niklas Schnelle
2022-11-28 13:00 ` Baolu Lu
2022-11-28 13:29 ` Jason Gunthorpe
2022-11-28 15:54 ` Niklas Schnelle
2022-11-28 16:35 ` Jason Gunthorpe
2022-11-28 21:01 ` Robin Murphy
2022-11-29 17:33 ` Jason Gunthorpe
2022-11-29 18:41 ` Robin Murphy [this message]
2022-11-29 20:09 ` Jason Gunthorpe
2022-11-30 1:28 ` Baolu Lu
2022-12-05 15:34 ` Niklas Schnelle
2022-12-06 23:09 ` Jason Gunthorpe
2022-12-07 13:18 ` Baolu Lu
2022-12-07 13:23 ` Jason Gunthorpe
2022-12-07 14:18 ` Robin Murphy
2022-12-07 14:30 ` Jason Gunthorpe
2022-11-28 16:56 ` Robin Murphy
2022-11-16 17:16 ` [PATCH v2 5/7] iommu/dma: Allow a single FQ in addition to per-CPU FQs Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 6/7] iommu/dma: Enable variable queue size and use larger single queue Niklas Schnelle
2022-11-16 17:16 ` [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication Niklas Schnelle
2022-11-28 14:52 ` Robin Murphy
2022-11-29 12:00 ` Niklas Schnelle
2022-11-29 12:53 ` Robin Murphy
2022-11-29 14:40 ` Niklas Schnelle
2022-12-02 14:29 ` Niklas Schnelle
2022-12-02 14:42 ` Jason Gunthorpe
2022-12-02 15:12 ` Niklas Schnelle
2022-12-02 15:24 ` Jason Gunthorpe
2022-12-05 18:24 ` Robin Murphy
2022-12-06 10:13 ` Niklas Schnelle
2022-11-29 13:51 ` Matthew Rosato
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