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iommu/vt-d: Don't store SIRTP request

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Don't store the SIRTP request bit in the register state. It will
otherwise become sticky and could request an Interrupt Remap Table
Pointer update on each command register write.

Found while starting to emulate IR in QEMU, not by observing problems on
real hardware.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jan Kiszka 2014-08-11 13:13:25 +02:00 committed by Joerg Roedel
parent 7d1311b93e
commit f63ef69028
1 changed files with 1 additions and 2 deletions
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3
drivers/iommu/intel_irq_remapping.c
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@ -438,8 +438,7 @@ static void iommu_set_irq_remapping(struct intel_iommu *iommu, int mode)
(addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
/* Set interrupt-remapping table pointer */
iommu->gcmd |= DMA_GCMD_SIRTP;
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd | DMA_GCMD_SIRTP, iommu->reg + DMAR_GCMD_REG);
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
readl, (sts & DMA_GSTS_IRTPS), sts);