From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 2/4] iommu: add ARM LPAE page table allocator
Date: Wed, 3 Dec 2014 11:11:08 +0000 [thread overview]
Message-ID: <20141203111108.GH7915@arm.com> (raw)
In-Reply-To: <vnkw8uipznbj.fsf@mitchelh-linux.qualcomm.com>
On Tue, Dec 02, 2014 at 10:41:52PM +0000, Mitchel Humpherys wrote:
> On Thu, Nov 27 2014 at 03:51:16 AM, Will Deacon <will.deacon@arm•com> wrote:
> > A number of IOMMUs found in ARM SoCs can walk architecture-compatible
> > page tables.
> >
> > This patch adds a generic allocator for Stage-1 and Stage-2 v7/v8
> > long-descriptor page tables. 4k, 16k and 64k pages are supported, with
> > up to 4-levels of walk to cover a 48-bit address space.
> >
> > Signed-off-by: Will Deacon <will.deacon@arm•com>
> > ---
>
> [...]
>
> > +static struct io_pgtable *arm_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg,
> > + void *cookie)
> > +{
> > + u64 reg;
> > + struct arm_lpae_io_pgtable *data = arm_lpae_alloc_pgtable(cfg);
> > +
> > + if (!data)
> > + return NULL;
> > +
> > + /* TCR */
> > + reg = ARM_LPAE_TCR_EAE |
> > + (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
> > + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
> > + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
>
> TCR has different definitions depending on whether we're using v7l or
> v8l. For example, bit 31 is TG1[1] (not EAE) when CBA2R.VA64=1. Are we
> expecting to have an io-pgtable-arm64.c or something? Seems like that
> would be mostly redundant with this file... (We have this problem in
> the current arm-smmu driver today).
I guess we can add an ARM_LPAE_V7_S1 format or something for this, although
we don't actually use TTBR1, so the current code shouldn't cause any issues.
Will
next prev parent reply other threads:[~2014-12-03 11:11 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-27 11:51 [PATCH 0/4] Generic IOMMU page table framework Will Deacon
2014-11-27 11:51 ` [PATCH 1/4] iommu: introduce generic page table allocation framework Will Deacon
2014-11-30 22:00 ` Laurent Pinchart
2014-12-01 12:13 ` Will Deacon
2014-12-01 13:33 ` Laurent Pinchart
2014-12-01 13:53 ` Will Deacon
2014-12-14 23:46 ` Laurent Pinchart
2014-12-15 9:45 ` Will Deacon
2014-11-27 11:51 ` [PATCH 2/4] iommu: add ARM LPAE page table allocator Will Deacon
2014-11-30 23:29 ` Laurent Pinchart
2014-12-01 17:23 ` Will Deacon
2014-12-01 20:21 ` Laurent Pinchart
2014-12-02 9:41 ` Will Deacon
2014-12-02 11:47 ` Laurent Pinchart
2014-12-05 18:48 ` Will Deacon
2014-12-02 22:41 ` Mitchel Humpherys
2014-12-03 11:11 ` Will Deacon [this message]
2014-12-05 10:55 ` Varun Sethi
2014-12-05 18:48 ` Will Deacon
2014-12-14 17:45 ` Varun Sethi
2014-12-15 13:30 ` Will Deacon
2014-12-15 15:43 ` Will Deacon
2014-12-15 16:35 ` Varun Sethi
2014-12-15 17:25 ` Will Deacon
2014-12-15 16:43 ` Varun Sethi
2014-12-15 17:20 ` Will Deacon
2014-11-27 11:51 ` [PATCH 3/4] iommu: add self-consistency tests to ARM LPAE IO " Will Deacon
2014-11-27 11:51 ` [PATCH 4/4] iommu/arm-smmu: make use of generic LPAE allocator Will Deacon
2014-11-30 22:03 ` [PATCH 0/4] Generic IOMMU page table framework Laurent Pinchart
2014-12-01 12:05 ` Will Deacon
2014-12-02 13:47 ` Laurent Pinchart
2014-12-02 13:53 ` Will Deacon
2014-12-02 22:29 ` Laurent Pinchart
2014-12-14 23:49 ` Laurent Pinchart
2014-12-15 16:10 ` Will Deacon
2014-12-15 17:33 ` Laurent Pinchart
2014-12-15 17:39 ` Will Deacon
2014-12-15 17:46 ` Laurent Pinchart
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