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iommu/vt-d: Fix debugfs register reads

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[ Upstream commit ba3b01d7a6 ]

Commit 6825d3ea6c ("iommu/vt-d: Add debugfs support to show register
contents") dumps the register contents for all IOMMU devices.

Currently, a 64 bit read(dmar_readq) is done for all the IOMMU registers,
even though some of the registers are 32 bits, which is incorrect.

Use the correct read function variant (dmar_readl/dmar_readq) while
reading the contents of 32/64 bit registers respectively.

Signed-off-by: Megha Dey <megha.dey@linux.intel.com>
Link: https://lore.kernel.org/r/1583784587-26126-2-git-send-email-megha.dey@linux.intel.com
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Megha Dey
2020-03-09 13:09:46 -07:00
committed by Greg Kroah-Hartman
parent e5ea0d970f
commit cb17ed60ec
2 changed files with 30 additions and 18 deletions
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2
include/linux/intel-iommu.h
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@@ -120,6 +120,8 @@
#define dmar_readq(a) readq(a)
#define dmar_writeq(a,v) writeq(v,a)
#define dmar_readl(a) readl(a)
#define dmar_writel(a, v) writel(v, a)
#define DMAR_VER_MAJOR(v) (((v) & 0xf0) >> 4)
#define DMAR_VER_MINOR(v) ((v) & 0x0f)