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author | Suresh Siddha <suresh.b.siddha@intel.com> | 2009-03-17 00:04:56 (GMT) |
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committer | H. Peter Anvin <hpa@linux.intel.com> | 2009-03-17 22:39:20 (GMT) |
commit | eba67e5da6e971993b2899d2cdf459ce77d3dbc5 (patch) | |
tree | 1776415c0ed65e6ad309b6790110941fadef243f /drivers/pci/intr_remapping.c | |
parent | 9d783ba042771284fb4ee5013c3d94220755ae7f (diff) | |
download | linux-fsl-qoriq-eba67e5da6e971993b2899d2cdf459ce77d3dbc5.tar.xz |
x86, dmar: routines for disabling queued invalidation and intr remapping
Impact: new interfaces (not yet used)
Routines for disabling queued invalidation and interrupt remapping.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'drivers/pci/intr_remapping.c')
-rw-r--r-- | drivers/pci/intr_remapping.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c index c38e3f4..0d202d7 100644 --- a/drivers/pci/intr_remapping.c +++ b/drivers/pci/intr_remapping.c @@ -467,6 +467,33 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode) return 0; } +/* + * Disable Interrupt Remapping. + */ +static void disable_intr_remapping(struct intel_iommu *iommu) +{ + unsigned long flags; + u32 sts; + + if (!ecap_ir_support(iommu->ecap)) + return; + + spin_lock_irqsave(&iommu->register_lock, flags); + + sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); + if (!(sts & DMA_GSTS_IRES)) + goto end; + + iommu->gcmd &= ~DMA_GCMD_IRE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, !(sts & DMA_GSTS_IRES), sts); + +end: + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + int __init enable_intr_remapping(int eim) { struct dmar_drhd_unit *drhd; |