From: Ard Biesheuvel <ardb@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Rob Herring <robh+dt@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Christoph Hellwig <hch@lst.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
<linux-rpi-kernel@lists.infradead.org>,
Jeremy Linton <jeremy.linton@arm.com>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Will Deacon <will@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>
Subject: Re: [PATCH v3 7/8] arm64: mm: Set ZONE_DMA size based on early IORT scan
Date: Fri, 16 Oct 2020 08:56:14 +0200 [thread overview]
Message-ID: <CAMj1kXGRcP_8OMHAdjTLNod40N_8dzqrX9=F+s7pd0EXy8O6DQ@mail.gmail.com> (raw)
In-Reply-To: <20201015103106.GA24739@e121166-lin.cambridge.arm.com>
On Thu, 15 Oct 2020 at 12:31, Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> wrote:
>
> On Wed, Oct 14, 2020 at 09:12:09PM +0200, Nicolas Saenz Julienne wrote:
>
> [...]
>
> > +unsigned int __init acpi_iort_get_zone_dma_size(void)
> > +{
> > + struct acpi_table_iort *iort;
> > + struct acpi_iort_node *node, *end;
> > + acpi_status status;
> > + u8 limit = 32;
> > + int i;
> > +
> > + if (acpi_disabled)
> > + return limit;
> > +
> > + status = acpi_get_table(ACPI_SIG_IORT, 0,
> > + (struct acpi_table_header **)&iort);
> > + if (ACPI_FAILURE(status))
> > + return limit;
> > +
> > + node = ACPI_ADD_PTR(struct acpi_iort_node, iort, iort->node_offset);
> > + end = ACPI_ADD_PTR(struct acpi_iort_node, iort, iort->header.length);
> > +
> > + for (i = 0; i < iort->node_count; i++) {
> > + if (node >= end)
> > + break;
> > +
> > + switch (node->type) {
> > + struct acpi_iort_named_component *ncomp;
> > + struct acpi_iort_root_complex *rc;
> > +
> > + case ACPI_IORT_NODE_NAMED_COMPONENT:
> > + ncomp = (struct acpi_iort_named_component *)node->node_data;
> > + if (ncomp->memory_address_limit)
> > + limit = min(limit, ncomp->memory_address_limit);
> > + break;
> > +
> > + case ACPI_IORT_NODE_PCI_ROOT_COMPLEX:
> > + rc = (struct acpi_iort_root_complex *)node->node_data;
> > + if (rc->memory_address_limit)
>
> You need to add a node revision check here, see rc_dma_get_range() in
> drivers/acpi/arm64/iort.c, otherwise we may be reading junk data
> in older IORT tables - acpica structures are always referring to the
> latest specs.
>
Indeed - apologies for not mentioning that when handing over the patch.
Also, we could use min_not_zero() here instead of the if ()
next prev parent reply other threads:[~2020-10-16 6:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 19:12 [PATCH v3 0/8] arm64: Default to 32-bit wide ZONE_DMA Nicolas Saenz Julienne
2020-10-14 19:12 ` [PATCH v3 7/8] arm64: mm: Set ZONE_DMA size based on early IORT scan Nicolas Saenz Julienne
2020-10-15 10:31 ` Lorenzo Pieralisi
2020-10-16 6:56 ` Ard Biesheuvel [this message]
2020-10-15 14:26 ` Hanjun Guo
2020-10-15 15:15 ` Nicolas Saenz Julienne
2020-10-15 18:03 ` Catalin Marinas
2020-10-16 6:51 ` Hanjun Guo
2020-10-16 6:54 ` Ard Biesheuvel
2020-10-16 7:27 ` Hanjun Guo
2020-10-16 7:34 ` Hanjun Guo
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