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of/irq: Fix msi-map calculation for nonzero rid-base

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commit 5d589d81acf974d23af98044aac56c6339d659f8 upstream.

The existing msi-map code is fine for shifting the entire RID space
upwards, but attempting finer-grained remapping reveals a bug. It turns
out that we are mistakenly treating the msi-base part as an offset, not
as a new base to remap onto, so things get squiffy when rid-base is
nonzero. Fix this, and at the same time add a sanity check against
having msi-map-mask clash with a nonzero rid-base, as that's another
thing one can easily get wrong.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Stuart Yoder <stuart.yoder@nxp.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Murphy 2016-02-09 11:04:45 +00:00 • committed by Greg Kroah-Hartman
parent b8558ada69
commit e1d61091db
1 changed files with 8 additions and 1 deletions
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9
drivers/of/irq.c
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@ -636,6 +636,13 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
msi_base = be32_to_cpup(msi_map + 2);
rid_len = be32_to_cpup(msi_map + 3);
if (rid_base & ~map_mask) {
dev_err(parent_dev,
"Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-base (0x%x)\n",
map_mask, rid_base);
return rid_out;
}
msi_controller_node = of_find_node_by_phandle(phandle);
matched = (masked_rid >= rid_base &&
@ -655,7 +662,7 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
if (!matched)
return rid_out;
rid_out = masked_rid + msi_base;
rid_out = masked_rid - rid_base + msi_base;
dev_dbg(dev,
"msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n",
dev_name(parent_dev), map_mask, rid_base, msi_base,