diff options
Diffstat (limited to 'drivers/pci/intr_remapping.c')
| -rw-r--r-- | drivers/pci/intr_remapping.c | 84 |
1 files changed, 82 insertions, 2 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c index b041a409f4a7..f5e0ea724a6f 100644 --- a/drivers/pci/intr_remapping.c +++ b/drivers/pci/intr_remapping.c @@ -9,6 +9,7 @@ #include <asm/cpu.h> #include <linux/intel-iommu.h> #include "intr_remapping.h" +#include <acpi/acpi.h> static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; static int ir_ioapic_num; @@ -415,12 +416,27 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) /* Set interrupt-remapping table pointer */ cmd = iommu->gcmd | DMA_GCMD_SIRTP; + iommu->gcmd |= DMA_GCMD_SIRTP; writel(cmd, iommu->reg + DMAR_GCMD_REG); IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_IRTPS), sts); spin_unlock_irqrestore(&iommu->register_lock, flags); + if (mode == 0) { + spin_lock_irqsave(&iommu->register_lock, flags); + + /* enable comaptiblity format interrupt pass through */ + cmd = iommu->gcmd | DMA_GCMD_CFI; + iommu->gcmd |= DMA_GCMD_CFI; + writel(cmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (sts & DMA_GSTS_CFIS), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flags); + } + /* * global invalidation of interrupt entry cache before enabling * interrupt-remapping. @@ -470,7 +486,7 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode) /* * Disable Interrupt Remapping. */ -static void disable_intr_remapping(struct intel_iommu *iommu) +static void iommu_disable_intr_remapping(struct intel_iommu *iommu) { unsigned long flags; u32 sts; @@ -478,6 +494,12 @@ static void disable_intr_remapping(struct intel_iommu *iommu) if (!ecap_ir_support(iommu->ecap)) return; + /* + * global invalidation of interrupt entry cache before disabling + * interrupt-remapping. + */ + qi_global_iec(iommu); + spin_lock_irqsave(&iommu->register_lock, flags); sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); @@ -503,6 +525,13 @@ int __init enable_intr_remapping(int eim) struct intel_iommu *iommu = drhd->iommu; /* + * If the queued invalidation is already initialized, + * shouldn't disable it. + */ + if (iommu->qi) + continue; + + /* * Clear previous faults. */ dmar_fault(-1, iommu); @@ -511,7 +540,7 @@ int __init enable_intr_remapping(int eim) * Disable intr remapping and queued invalidation, if already * enabled prior to OS handover. */ - disable_intr_remapping(iommu); + iommu_disable_intr_remapping(iommu); dmar_disable_qi(iommu); } @@ -639,3 +668,54 @@ int __init parse_ioapics_under_ir(void) return ir_supported; } + +void disable_intr_remapping(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + + /* + * Disable Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + iommu_disable_intr_remapping(iommu); + } +} + +int reenable_intr_remapping(int eim) +{ + struct dmar_drhd_unit *drhd; + int setup = 0; + struct intel_iommu *iommu = NULL; + + for_each_iommu(iommu, drhd) + if (iommu->qi) + dmar_reenable_qi(iommu); + + /* + * Setup Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + /* Set up interrupt remapping for iommu.*/ + iommu_set_intr_remapping(iommu, eim); + setup = 1; + } + + if (!setup) + goto error; + + return 0; + +error: + /* + * handle error condition gracefully here! + */ + return -1; +} + |
