AuxXxilium/linux_dsm_epyc7002
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parisc: mask out enable and reserved bits from sba imask

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When using kexec the SBA IOMMU IBASE might still have the RE
bit set. This triggers a WARN_ON when trying to write back the
IBASE register later, and it also makes some mask calculations fail.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Sven Schnelle 2020-08-11 18:19:19 +02:00 committed by Helge Deller
parent 3bc6e3dc5a
commit 5b24993c21
1 changed files with 1 additions and 1 deletions
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2
drivers/parisc/sba_iommu.c
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@ -1270,7 +1270,7 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
** (one that doesn't overlap memory or LMMIO space) in the
** IBASE and IMASK registers.
*/
ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1fffffULL;
iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {