From: Robin Murphy <robin.murphy@arm.com>
To: Lu Baolu <baolu.lu@linux.intel.com>,
David Woodhouse <dwmw2@infradead.org>,
Joerg Roedel <joro@8bytes.org>
Cc: ashok.raj@intel.com, jacob.jun.pan@intel.com, alan.cox@intel.com,
kevin.tian@intel.com, mika.westerberg@linux.intel.com,
pengfei.xu@intel.com,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 01/10] iommu: Add helper to get minimal page size of domain
Date: Mon, 29 Apr 2019 11:55:54 +0100 [thread overview]
Message-ID: <05eca601-0264-8141-ceeb-7ef7ad5d5650@arm.com> (raw)
In-Reply-To: <20190421011719.14909-2-baolu.lu@linux.intel.com>
On 21/04/2019 02:17, Lu Baolu wrote:
> This makes it possible for other modules to know the minimal
> page size supported by a domain without the knowledge of the
> structure details.
>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
> include/linux/iommu.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index a5007d035218..46679ef19b7e 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -377,6 +377,14 @@ static inline void iommu_tlb_sync(struct iommu_domain *domain)
> domain->ops->iotlb_sync(domain);
> }
>
> +static inline unsigned long domain_minimal_pgsize(struct iommu_domain *domain)
> +{
> + if (domain && domain->pgsize_bitmap)
> + return 1 << __ffs(domain->pgsize_bitmap);
Nit: this would probably be more efficient on most architectures as:
if (domain)
return domain->pgsize_bitmap & -domain->pgsize_bitmap;
I'd also suggest s/minimal/min/ in the name, just to stop it getting too
long. Otherwise, though, I like the idea, and there's at least one other
place (in iommu-dma) that can make use of it straight away.
Robin.
> +
> + return 0;
> +}
> +
> /* PCI device grouping function */
> extern struct iommu_group *pci_device_group(struct device *dev);
> /* Generic device grouping function */
> @@ -704,6 +712,11 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
> return NULL;
> }
>
> +static inline unsigned long domain_minimal_pgsize(struct iommu_domain *domain)
> +{
> + return 0;
> +}
> +
> #endif /* CONFIG_IOMMU_API */
>
> #ifdef CONFIG_IOMMU_DEBUGFS
>
next prev parent reply other threads:[~2019-04-29 10:56 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-21 1:17 [PATCH v3 00/10] iommu: Bounce page for untrusted devices Lu Baolu
2019-04-21 1:17 ` [PATCH v3 01/10] iommu: Add helper to get minimal page size of domain Lu Baolu
2019-04-29 10:55 ` Robin Murphy [this message]
2019-04-30 0:40 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 02/10] swiotlb: Factor out slot allocation and free Lu Baolu
2019-04-22 16:45 ` Christoph Hellwig
2019-04-23 1:58 ` Lu Baolu
2019-04-23 6:12 ` Christoph Hellwig
2019-04-23 7:32 ` Lu Baolu
2019-04-24 14:45 ` Christoph Hellwig
2019-04-25 2:07 ` Lu Baolu
2019-04-26 15:04 ` Christoph Hellwig
2019-04-29 5:10 ` Lu Baolu
2019-04-29 11:06 ` Robin Murphy
2019-04-29 11:44 ` Christoph Hellwig
2019-05-06 1:54 ` Lu Baolu
2019-05-13 7:05 ` Christoph Hellwig
2019-05-16 1:53 ` Lu Baolu
2019-04-30 2:02 ` Lu Baolu
2019-04-30 9:53 ` Robin Murphy
2019-05-02 1:47 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 03/10] swiotlb: Limit tlb address range inside slot pool Lu Baolu
2019-04-21 1:17 ` [PATCH v3 04/10] swiotlb: Extend swiotlb to support page bounce Lu Baolu
2019-04-21 1:17 ` [PATCH v3 05/10] iommu: Add bounce page APIs Lu Baolu
2019-04-21 1:17 ` [PATCH v3 06/10] iommu/vt-d: Add trace events for domain map/unmap Lu Baolu
2019-04-21 1:17 ` [PATCH v3 07/10] iommu/vt-d: Keep swiotlb on if bounce page is necessary Lu Baolu
2019-04-22 16:47 ` Christoph Hellwig
2019-04-23 2:00 ` Lu Baolu
2019-04-21 1:17 ` [PATCH v3 08/10] iommu/vt-d: Check whether device requires bounce buffer Lu Baolu
2019-04-22 16:47 ` Christoph Hellwig
2019-04-23 2:03 ` Lu Baolu
2019-04-23 6:08 ` Christoph Hellwig
2019-04-23 7:35 ` Lu Baolu
2019-04-24 18:27 ` Konrad Rzeszutek Wilk
2019-04-21 1:17 ` [PATCH v3 09/10] iommu/vt-d: Add dma sync ops for untrusted devices Lu Baolu
2019-04-21 1:17 ` [PATCH v3 10/10] iommu/vt-d: Use bounce buffer " Lu Baolu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=05eca601-0264-8141-ceeb-7ef7ad5d5650@arm.com \
--to=robin.murphy@arm.com \
--cc=alan.cox@intel.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=dwmw2@infradead.org \
--cc=hch@lst.de \
--cc=iommu@lists.linux-foundation.org \
--cc=jacob.jun.pan@intel.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=konrad.wilk@oracle.com \
--cc=linux-kernel@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=mika.westerberg@linux.intel.com \
--cc=pengfei.xu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).