Hi Daniel,
Seems there's already a patch to fix this issue posted by Joerg
http://www.spinics.net/lists/kernel/msg2004510.html
Thanks!
Gerry
On 2015/6/4 16:07, Daniel J Blueman wrote:
> Fix Intel IOMMU build failure in linux-next when CONFIG_INTEL_IOMMU is not
> enabled.
>
> Signed-off-by: Daniel J Blueman <dan...@numascale.com>
> ---
> drivers/iommu/intel_irq_remapping.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/iommu/intel_irq_remapping.c
> b/drivers/iommu/intel_irq_remapping.c
> index 24f7a35..ec337e7 100644
> --- a/drivers/iommu/intel_irq_remapping.c
> +++ b/drivers/iommu/intel_irq_remapping.c
> @@ -146,8 +146,10 @@ static int modify_irte(struct irq_2_iommu *irq_iommu,
> set_64bit(&irte->low, irte_modified->low);
> set_64bit(&irte->high, irte_modified->high);
>
> +#ifdef CONFIG_INTEL_IOMMU
> if (iommu->pre_enabled_ir)
> __iommu_update_old_irte(iommu, index);
> +#endif
>
> __iommu_flush_cache(iommu, irte, sizeof(*irte));
>
> @@ -210,8 +212,10 @@ static int clear_entries(struct irq_2_iommu *irq_iommu)
> bitmap_release_region(iommu->ir_table->bitmap, index,
> irq_iommu->irte_mask);
>
> +#ifdef CONFIG_INTEL_IOMMU
> if (iommu->pre_enabled_ir)
> __iommu_update_old_irte(iommu, -1);
> +#endif
>
> return qi_flush_iec(iommu, index, irq_iommu->irte_mask);
> }
> @@ -650,6 +654,7 @@ static int __init intel_enable_irq_remapping(void)
> * Setup Interrupt-remapping for all the DRHD's now.
> */
> for_each_iommu(iommu, drhd) {
> +#ifdef CONFIG_INTEL_IOMMU
> if (iommu->pre_enabled_ir) {
> unsigned long long q;
>
> @@ -660,6 +665,7 @@ static int __init intel_enable_irq_remapping(void)
> INTR_REMAP_TABLE_ENTRIES*sizeof(struct irte));
> __iommu_load_old_irte(iommu);
> } else
> +#endif
> iommu_set_irq_remapping(iommu, eim);
>
> setup = true;
> @@ -1374,6 +1380,7 @@ static int __iommu_update_old_irte(struct intel_iommu
> *iommu, int index)
>
> static void iommu_check_pre_ir_status(struct intel_iommu *iommu)
> {
> +#ifdef CONFIG_INTEL_IOMMU
> u32 sts;
>
> sts = readl(iommu->reg + DMAR_GSTS_REG);
> @@ -1381,4 +1388,5 @@ static void iommu_check_pre_ir_status(struct
> intel_iommu *iommu)
> pr_info("IR is enabled prior to OS.\n");
> iommu->pre_enabled_ir = 1;
> }
> +#endif
> }
>
--
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